2017 Vol. 32, No. 2
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2017, 32(2)
:1-6.
doi: 10.3969/j.issn.2096-1553.2017.2.001
Abstract:
The contents of K, Ca, Mg, Fe, Cu and Pb in ten coriander samples from two kinds of different growing regions was evaluated in HClO4-HNO3 digestive system by using wet digestion and flame atomic absorption spectrophotometry (FAAS). The results showed that two kinds of ten coriander samples contained high contents of K, Ca, Mg and Fe of human requirements, as well as a certain amount of heavy metal elements Cu and Pb. But the element contents of ten coriander samples from different growing regions had the certain differences. The certain differences in element contents were also observed between the leaves and stems of ten coriander in the same growing region,in addition to Mg,the content of other five elements in the leaves were higher than that of stem,standard addition recovery experiment showed that the average recovery 84%~107% and the relative standard deviation 0.5%~1.3% of Fe and Cu elements.The experimental method was accurate and the results were reliable.
The contents of K, Ca, Mg, Fe, Cu and Pb in ten coriander samples from two kinds of different growing regions was evaluated in HClO4-HNO3 digestive system by using wet digestion and flame atomic absorption spectrophotometry (FAAS). The results showed that two kinds of ten coriander samples contained high contents of K, Ca, Mg and Fe of human requirements, as well as a certain amount of heavy metal elements Cu and Pb. But the element contents of ten coriander samples from different growing regions had the certain differences. The certain differences in element contents were also observed between the leaves and stems of ten coriander in the same growing region,in addition to Mg,the content of other five elements in the leaves were higher than that of stem,standard addition recovery experiment showed that the average recovery 84%~107% and the relative standard deviation 0.5%~1.3% of Fe and Cu elements.The experimental method was accurate and the results were reliable.
2017, 32(2)
:7-12.
doi: 10.3969/j.issn.2096-1553.2017.2.002
Abstract:
To obtain different instant tea,three tea leaves(Pu'er tea,Gold Junmei tea and Tie Guanyin tea) were extrated by conventional (90℃,30 min) and pressurized (120℃,30 min) methods and dried in freezing and spraying condition.The amino acid composition and content were determined by the automatic amino acid analyzer,and the sensory evaluation was conducted.The yield and the content of free amino acids in instant tea powder was higher under the conditions of 120℃ pressurized hot extraction and freeze drying.The sensory evaluation showed freeze drying tea sample was more aromatic, better soluble, more mellow in taste, and it soup color was also easier to accept than spray drying tea sample.
To obtain different instant tea,three tea leaves(Pu'er tea,Gold Junmei tea and Tie Guanyin tea) were extrated by conventional (90℃,30 min) and pressurized (120℃,30 min) methods and dried in freezing and spraying condition.The amino acid composition and content were determined by the automatic amino acid analyzer,and the sensory evaluation was conducted.The yield and the content of free amino acids in instant tea powder was higher under the conditions of 120℃ pressurized hot extraction and freeze drying.The sensory evaluation showed freeze drying tea sample was more aromatic, better soluble, more mellow in taste, and it soup color was also easier to accept than spray drying tea sample.
2017, 32(2)
:13-19.
doi: 10.3969/j.issn.2096-1553.2017.2.003
Abstract:
Oat was dehulled at different levels by using polishing machine. The oat bran and grain after dehulling of different time-periods were then collected. The aleurone layer residual of oat grain was evaluated by using fluorescene microscopy.The influence of the technology parameters on oat dehulling effect was analyzed by using single factor and orthogonal experiments. Then, the variance analysis of dehulling rate,whiteness and broken rate for oat was further performed. The results showed that the aleurone layer of oat grain retained well under the dehulling rate of 9.82%. Based on the above dehulling rate, the optimal dehulling process was as follows:moisture content 9%, tempering time 180 min, grinding wheel 60# and friction time 20 s.Under the technological conditions,oat flour produced with higher white degree,better taste,uniform colour and lustre,and higher milled rice rate.
Oat was dehulled at different levels by using polishing machine. The oat bran and grain after dehulling of different time-periods were then collected. The aleurone layer residual of oat grain was evaluated by using fluorescene microscopy.The influence of the technology parameters on oat dehulling effect was analyzed by using single factor and orthogonal experiments. Then, the variance analysis of dehulling rate,whiteness and broken rate for oat was further performed. The results showed that the aleurone layer of oat grain retained well under the dehulling rate of 9.82%. Based on the above dehulling rate, the optimal dehulling process was as follows:moisture content 9%, tempering time 180 min, grinding wheel 60# and friction time 20 s.Under the technological conditions,oat flour produced with higher white degree,better taste,uniform colour and lustre,and higher milled rice rate.
2017, 32(2)
:20-25.
doi: 10.3969/j.issn.2096-1553.2017.2.004
Abstract:
Wheat gluten was a nutritious and abundant plant protein.However,its molecular structure prevented the wide application of wheat gluten.The solubility,emulsibility and foaming properties of modified wheat gluten were much improved,which greatly expanded its application in food.The recent research progress of three kinds of modification technologies for wheat gluten was reviewed,including physical,chemical and enzymatic methods.Based on the above,it is suggested that the combined modification technologyies of meat gluten could be more effective due to the limitations of single modification technology.
Wheat gluten was a nutritious and abundant plant protein.However,its molecular structure prevented the wide application of wheat gluten.The solubility,emulsibility and foaming properties of modified wheat gluten were much improved,which greatly expanded its application in food.The recent research progress of three kinds of modification technologies for wheat gluten was reviewed,including physical,chemical and enzymatic methods.Based on the above,it is suggested that the combined modification technologyies of meat gluten could be more effective due to the limitations of single modification technology.
2017, 32(2)
:26-32.
doi: 10.3969/j.issn.2096-1553.2017.2.005
Abstract:
The immobilization conditions of halohydrin dehalogenase (HHDH) by the sodium alginate were studied.The optimum conditions of immobilization process were as follows:sodium alginate concentration 3.5%, HHDH enzymatic amount 2.4×104 U/mL, glutaraldehyde concentration 1.00%, calcium chloride solution concentration 1.5% and immobilization time 2 h.Under the optimum immobilization conditions, the encapsulation efficiency of HHDH was 52.1%, the activity recovery of HHDH was 75.2%.After five batches of intermittent catalytic synthesis of (R)-4-cyano-3-hydroxybutyric acid ethyl (ATS-5), the residual activity of immobilized HHDH was 51.2%. After the continuous catalytic synthesis of ATS-5 for 10 d,the substrate conversion efficiency was 90.6%, the distillation purification yield of ATS-5 was 98.2%, the purity and optical purity of ATS-5 were 99.3% and 99.1%, respectively.No obvious activity loss was obtained for immobilized HHDH after 80 d storage at 4℃.
The immobilization conditions of halohydrin dehalogenase (HHDH) by the sodium alginate were studied.The optimum conditions of immobilization process were as follows:sodium alginate concentration 3.5%, HHDH enzymatic amount 2.4×104 U/mL, glutaraldehyde concentration 1.00%, calcium chloride solution concentration 1.5% and immobilization time 2 h.Under the optimum immobilization conditions, the encapsulation efficiency of HHDH was 52.1%, the activity recovery of HHDH was 75.2%.After five batches of intermittent catalytic synthesis of (R)-4-cyano-3-hydroxybutyric acid ethyl (ATS-5), the residual activity of immobilized HHDH was 51.2%. After the continuous catalytic synthesis of ATS-5 for 10 d,the substrate conversion efficiency was 90.6%, the distillation purification yield of ATS-5 was 98.2%, the purity and optical purity of ATS-5 were 99.3% and 99.1%, respectively.No obvious activity loss was obtained for immobilized HHDH after 80 d storage at 4℃.
2017, 32(2)
:33-39.
doi: 10.3969/j.issn.2096-1553.2017.2.006
Abstract:
The transcriptome of Morchella crassipes M10 collected from Xinzheng of He'nan Province was sequenced by the next generation sequencing technology,and distribution characteristic of simple sequence repeats (SSR) were analyzed.The results showed that:1) A total of 13 044 SSR sites were detected,which was distributed in 8851 Trinity genes,about 2858 Trinity genes had more than one SSR loci and the number of compound formation SSR loci was 1925.The average density of SSR loci was 2067.77 bp/piece in the transcriptome sequence of Morchella crassipes, which was much higher than that of other fungi. 2) The number of single base repeat motif was 8600, the largest one, among which the number of A/T repeat types was higher than C/G repeat types and the same as most macro-fungi;the number of tri-nucleotide (TGC) repeat motif was 2497, among which ACC/GGT,AGC/CTG and AGG/CCT accounted for 60% and obviously appeared with GC high probability. In the development of SSR molecular marker or other repeat polymorphic marker, SSR abundant with GC could be chosen as the best primers.
The transcriptome of Morchella crassipes M10 collected from Xinzheng of He'nan Province was sequenced by the next generation sequencing technology,and distribution characteristic of simple sequence repeats (SSR) were analyzed.The results showed that:1) A total of 13 044 SSR sites were detected,which was distributed in 8851 Trinity genes,about 2858 Trinity genes had more than one SSR loci and the number of compound formation SSR loci was 1925.The average density of SSR loci was 2067.77 bp/piece in the transcriptome sequence of Morchella crassipes, which was much higher than that of other fungi. 2) The number of single base repeat motif was 8600, the largest one, among which the number of A/T repeat types was higher than C/G repeat types and the same as most macro-fungi;the number of tri-nucleotide (TGC) repeat motif was 2497, among which ACC/GGT,AGC/CTG and AGG/CCT accounted for 60% and obviously appeared with GC high probability. In the development of SSR molecular marker or other repeat polymorphic marker, SSR abundant with GC could be chosen as the best primers.
2017, 32(2)
:40-47.
doi: 10.3969/j.issn.2096-1553.2017.2.007
Abstract:
There is a high toxicity and carcinogenicity of aflatoxin B1(AFB1) in food. Current detection of aflatoxin B1 is performed by a variety of methods including thin layer chromatography, high performance liquid chromatography, liquid chromatography-tandem mass spectrometry and immunoassay, but they all have some limitations. AFB1 detection research had obtained certain achievements based on nucleic acid aptasensor.The three new detection technology based on the electrochemical nucleic acid aptasensor,optical nucleic acid aptasensor and PCR nucleic acid aptasensor had advantages and disadvantages.A new idea in which glucose meter was used as a detection instrument and combined with nucleic acid aptasensor for AFB1 qualitative analysis were to be experimental veried.Combining nucleic acid aptasensor with magnetic nanoparticle united with bio-recognition elements as the adsorbent for solid phase extraction (SPE) was expected to be a breakthrough in the future.
There is a high toxicity and carcinogenicity of aflatoxin B1(AFB1) in food. Current detection of aflatoxin B1 is performed by a variety of methods including thin layer chromatography, high performance liquid chromatography, liquid chromatography-tandem mass spectrometry and immunoassay, but they all have some limitations. AFB1 detection research had obtained certain achievements based on nucleic acid aptasensor.The three new detection technology based on the electrochemical nucleic acid aptasensor,optical nucleic acid aptasensor and PCR nucleic acid aptasensor had advantages and disadvantages.A new idea in which glucose meter was used as a detection instrument and combined with nucleic acid aptasensor for AFB1 qualitative analysis were to be experimental veried.Combining nucleic acid aptasensor with magnetic nanoparticle united with bio-recognition elements as the adsorbent for solid phase extraction (SPE) was expected to be a breakthrough in the future.
2017, 32(2)
:48-57.
doi: 10.3969/j.issn.2096-1553.2017.2.008
Abstract:
Six flue-cured tobacco bud extract samples from different areas were prepared by ultrasonic water extraction method for sensory evaluation.The volatile components from three extract samples including two better and one worse according to sensory evaluation were selected to extract by solvent extraction method and analyzed by GC-MS and principal components analysis.The sensory evaluation results showed that the cigarette flavoring effect order of six different areas of flue-cured tobacco bud extract was:Wenshan,Yunnan > Fengjie,Chongqing > Xingyi,Guizhou > Zhaotong,Yunnan > control > Hechi,Guangxi > Shaoyang,Hunan.The internal quality of cigarette that added the extract samples from Wenshan,Yunnan and Fengjie,Chongqing were improved significantly,compared with the control.The extract samples from Wenshan,Yunnan,Fengjie,Chongqing and Shaoyang,Hunan were analyzed by GC-MS.The results showed that the volatile components,types and content of extract samples from different areas were quite different.Principal components analysis showed that the influence of extract samples from three different origins were different.The order according to score of the principal component of three extract samples was:Wenshan,Yunnan > Fengjie,Chongqing > Shaoyang,Hunan,which was coincident with the results of sensory quality.
Six flue-cured tobacco bud extract samples from different areas were prepared by ultrasonic water extraction method for sensory evaluation.The volatile components from three extract samples including two better and one worse according to sensory evaluation were selected to extract by solvent extraction method and analyzed by GC-MS and principal components analysis.The sensory evaluation results showed that the cigarette flavoring effect order of six different areas of flue-cured tobacco bud extract was:Wenshan,Yunnan > Fengjie,Chongqing > Xingyi,Guizhou > Zhaotong,Yunnan > control > Hechi,Guangxi > Shaoyang,Hunan.The internal quality of cigarette that added the extract samples from Wenshan,Yunnan and Fengjie,Chongqing were improved significantly,compared with the control.The extract samples from Wenshan,Yunnan,Fengjie,Chongqing and Shaoyang,Hunan were analyzed by GC-MS.The results showed that the volatile components,types and content of extract samples from different areas were quite different.Principal components analysis showed that the influence of extract samples from three different origins were different.The order according to score of the principal component of three extract samples was:Wenshan,Yunnan > Fengjie,Chongqing > Shaoyang,Hunan,which was coincident with the results of sensory quality.
2017, 32(2)
:58-63.
doi: 10.3969/j.issn.2096-1553.2017.2.009
Abstract:
The electic drying oven was used to simulate the baking treatmeat technology of burley tobacco,temperature and time were selected as independent variable, the content change of reducing sugar, the total water soluble sugars, nicotine, total nitrogen and volatile alkaline aroma compounds of burley tobacco under different roasting conditions were studied by response surface method.The results showed that:1)With baking conditions change, the content of volatile alkaline aroma compounds,reducing sugar and the total water soluble sugars changed significantly.The changes of reducing sugar content and total water soluble sugars content were affected strongly by baking conditions, however, nicotine content and total nitrogen content were less affected, that's to say, baking conditions could affect significantly the effect on increasing aroma compounds of burley tobacco. 2) There was a significant negative correlation between reducing sugar content and volatile alkaline aroma compounds content after baking burley tobacco.Above all,that "reducing sugar content decreased the most" as evaluation standard of baking effect on increasing burley tobacco aroma compounds can optimize the burley tobacco baking process parameters,improve the work efficiency and reduce test cost.
The electic drying oven was used to simulate the baking treatmeat technology of burley tobacco,temperature and time were selected as independent variable, the content change of reducing sugar, the total water soluble sugars, nicotine, total nitrogen and volatile alkaline aroma compounds of burley tobacco under different roasting conditions were studied by response surface method.The results showed that:1)With baking conditions change, the content of volatile alkaline aroma compounds,reducing sugar and the total water soluble sugars changed significantly.The changes of reducing sugar content and total water soluble sugars content were affected strongly by baking conditions, however, nicotine content and total nitrogen content were less affected, that's to say, baking conditions could affect significantly the effect on increasing aroma compounds of burley tobacco. 2) There was a significant negative correlation between reducing sugar content and volatile alkaline aroma compounds content after baking burley tobacco.Above all,that "reducing sugar content decreased the most" as evaluation standard of baking effect on increasing burley tobacco aroma compounds can optimize the burley tobacco baking process parameters,improve the work efficiency and reduce test cost.
2017, 32(2)
:64-70.
doi: 10.3969/j.issn.2096-1553.2017.2.010
Abstract:
In order to solve the problem that the hot-air temperature fluctuations of SJ1237 cut tobacco casing cylinder in certain cigarette factory is over technology assessment requirements, the hot-air temperature control system of cut tobacco casing sylinder was improved to improve the compressed air pressure, optimize screen cleaning, moisture removal and steam injection. The operation result showed that hot-air temperature (100±2)℃,process capability index of hot-air temperature was raised to 1.96, standard deviation of outlet waterwas decreased to 0.13%, the amount of material adhered in cylinder body reduced to 1.9 kg/d. It reached the purpose of stabilizing hot-air temperature.
In order to solve the problem that the hot-air temperature fluctuations of SJ1237 cut tobacco casing cylinder in certain cigarette factory is over technology assessment requirements, the hot-air temperature control system of cut tobacco casing sylinder was improved to improve the compressed air pressure, optimize screen cleaning, moisture removal and steam injection. The operation result showed that hot-air temperature (100±2)℃,process capability index of hot-air temperature was raised to 1.96, standard deviation of outlet waterwas decreased to 0.13%, the amount of material adhered in cylinder body reduced to 1.9 kg/d. It reached the purpose of stabilizing hot-air temperature.
2017, 32(2)
:71-77.
doi: 10.3969/j.issn.2096-1553.2017.2.011
Abstract:
Pt/Gr catalysts were prepared via both organic sol method and sodium borohydride reduction method (denoted as Pt/Gr-OS and Pt/Gr-SR, respectively) with grapheme oxide (GO) as carrier precursor and chloroplatinic acid with polyvinyl pyrrolidone (PVP) as complexing agent.TEM and XRD were used to characterize the morphology, particle size, and size distribution, and the electro-catalytic performance of the catalysts for methanol oxidation was also investigated by means of cyclic voltammetry and chronoamperometry. The results showed that compared with Pt/C, the Pt/Gr catalysts obtained by using both of the methods had high dispersion and Pt/Gr-OS had higher dispersion than Pt/Gr-SR; Pt/Gr-OS had smaller particle size,larger electrochemical activity specific surface area,and higher electro-catalytic performance on methanol oxidation.The electro-catalytic performance of Pt/Gr-OS was 1.7 and 3.8 times as those of Pt/Gr-SR and Pt/C catalysts, respectively. In addition, Pt/Gr-OS had higher stability than Pt/Gr-SR and Pt/C.
Pt/Gr catalysts were prepared via both organic sol method and sodium borohydride reduction method (denoted as Pt/Gr-OS and Pt/Gr-SR, respectively) with grapheme oxide (GO) as carrier precursor and chloroplatinic acid with polyvinyl pyrrolidone (PVP) as complexing agent.TEM and XRD were used to characterize the morphology, particle size, and size distribution, and the electro-catalytic performance of the catalysts for methanol oxidation was also investigated by means of cyclic voltammetry and chronoamperometry. The results showed that compared with Pt/C, the Pt/Gr catalysts obtained by using both of the methods had high dispersion and Pt/Gr-OS had higher dispersion than Pt/Gr-SR; Pt/Gr-OS had smaller particle size,larger electrochemical activity specific surface area,and higher electro-catalytic performance on methanol oxidation.The electro-catalytic performance of Pt/Gr-OS was 1.7 and 3.8 times as those of Pt/Gr-SR and Pt/C catalysts, respectively. In addition, Pt/Gr-OS had higher stability than Pt/Gr-SR and Pt/C.
2017, 32(2)
:78-83.
doi: 10.3969/j.issn.2096-1553.2017.2.012
Abstract:
Three dimensional flower-like NiCo2O4 was prepared by a hydrothermal method and annealing treatment. XRD, XPS and SEM were used to characterize the crystallization, element composition and morphology of synthesized material.The results showed that:1)The crystallinity of the synthesized NiCo2O4 material was not high. 2)The material contained Ni and Co elements with different valences. The presence of the Ni2+/Ni3+ and Co2+/Co3+ provided two active centers for the generation of pseudocapacitance. 3)As supercapacitor electrode material, the three dimensional flower-like NiCo2O4 displayed excellent electrochemical performance.
Three dimensional flower-like NiCo2O4 was prepared by a hydrothermal method and annealing treatment. XRD, XPS and SEM were used to characterize the crystallization, element composition and morphology of synthesized material.The results showed that:1)The crystallinity of the synthesized NiCo2O4 material was not high. 2)The material contained Ni and Co elements with different valences. The presence of the Ni2+/Ni3+ and Co2+/Co3+ provided two active centers for the generation of pseudocapacitance. 3)As supercapacitor electrode material, the three dimensional flower-like NiCo2O4 displayed excellent electrochemical performance.
2017, 32(2)
:84-90.
doi: 10.3969/j.issn.2096-1553.2017.2.013
Abstract:
Take the example of pulp and paper companies,advantages and disadvantages of several commonly used accounting methods for the emission performance value of chemical oxygen demand (COD) were compared.Methods such as correlation analysis, linear regression, and weighted average were proposed as potential tools for the calculation of COD emission performance value.Comparison was made with the traditional methods of pollution discharging coefficient, quota standard, and recommended value of the interim measure,the performance values were determined,which could really reflect the emission status of the papermaking enterprises. The recommended values for waste paper, old corrugated paper, old cardboard box, and wheat straw pulp and paper companies were 3162 g/t, 3349 g/t, 1744 g/t, and 3600 g/t, respectively, with the qualification rate of 50%~57%.Regarding to the difference of environment capacity in various regions, a method was proposed for setting special discharge performance values by using quota standard method.
Take the example of pulp and paper companies,advantages and disadvantages of several commonly used accounting methods for the emission performance value of chemical oxygen demand (COD) were compared.Methods such as correlation analysis, linear regression, and weighted average were proposed as potential tools for the calculation of COD emission performance value.Comparison was made with the traditional methods of pollution discharging coefficient, quota standard, and recommended value of the interim measure,the performance values were determined,which could really reflect the emission status of the papermaking enterprises. The recommended values for waste paper, old corrugated paper, old cardboard box, and wheat straw pulp and paper companies were 3162 g/t, 3349 g/t, 1744 g/t, and 3600 g/t, respectively, with the qualification rate of 50%~57%.Regarding to the difference of environment capacity in various regions, a method was proposed for setting special discharge performance values by using quota standard method.
2017, 32(2)
:91-96.
doi: 10.3969/j.issn.2096-1553.2017.2.014
Abstract:
In view of the problem of three-phase voltage unbalance, the double second-order generalized integrator frequency-locked loop (DSOGI-FLL) was designed.It used DSOGI-FLL angular frequency feedback instead of the second order generalized integrator phase-locked loop (DSOGI-PLL) frequency feedback, and realized the adaptive control of the input voltage frequency. Four conditions including asymmetric voltage drop, harmonic pollution, phase mutations, frequency mutations were simulated in Matlab/Simulink platform, and its performance was compared with DSOGI-PLL.The results showed that DSOGI-FLL had the better characteristics in tracking phase and frequency in all kinds of cases; especially so when the phase variation and frequency variation happened.
In view of the problem of three-phase voltage unbalance, the double second-order generalized integrator frequency-locked loop (DSOGI-FLL) was designed.It used DSOGI-FLL angular frequency feedback instead of the second order generalized integrator phase-locked loop (DSOGI-PLL) frequency feedback, and realized the adaptive control of the input voltage frequency. Four conditions including asymmetric voltage drop, harmonic pollution, phase mutations, frequency mutations were simulated in Matlab/Simulink platform, and its performance was compared with DSOGI-PLL.The results showed that DSOGI-FLL had the better characteristics in tracking phase and frequency in all kinds of cases; especially so when the phase variation and frequency variation happened.
2017, 32(2)
:97-102.
doi: 10.3969/j.issn.2096-1553.2017.2.015
Abstract:
In order to solve the problems of automated guided vehicle (AGV) of small market scale and high cost and difficulty in meeting the needs of the automation of enterprise logistics,the cascade PID control guidance algorithm was designed,a load 10 t two-way heavy load intelligent automated guided vehicle was developed based on Siemens 1200 series PLC and intelligent control technology.After the commission the vehicle could run according to code-band and track deviation value was within ±10 mm.The system was quick in reaction and stable in running,AGV could realize autonomous navigation,autonomous obstacle avoidance and autonomous positioning,etc.
In order to solve the problems of automated guided vehicle (AGV) of small market scale and high cost and difficulty in meeting the needs of the automation of enterprise logistics,the cascade PID control guidance algorithm was designed,a load 10 t two-way heavy load intelligent automated guided vehicle was developed based on Siemens 1200 series PLC and intelligent control technology.After the commission the vehicle could run according to code-band and track deviation value was within ±10 mm.The system was quick in reaction and stable in running,AGV could realize autonomous navigation,autonomous obstacle avoidance and autonomous positioning,etc.
2017, 32(2)
:103-108.
doi: 10.3969/j.issn.2096-1553.2017.2.016
Abstract:
The prediction model of the current output of the active power filter inverter was constructed by α-β coordinate transformation, and the optimal current control strategy was proposed to reduce the switching loss of the active power filter. The design used an evaluation function to evaluate the voltage vectors in different switching state of the inverter switching device for the sake of predicting all the possible compensation current values of active power filter. When the evaluation function value turned the smallest, the switch state corresponding to the voltage vector was applied to the next sampling period, acheiving the quick tracking of the harmonic reference current. The evaluation function increased the switching frequency of the additional term, by controlling the number of switching operations to realize the switching frequency drop. The simulation results showed that this control strategy could significantly reduce the switching frequency by optimizing the evaluation function and selecting the appropriate weight coefficient, ensure the balance between switching frequency and grid current, and effectively reduce the switching losses.
The prediction model of the current output of the active power filter inverter was constructed by α-β coordinate transformation, and the optimal current control strategy was proposed to reduce the switching loss of the active power filter. The design used an evaluation function to evaluate the voltage vectors in different switching state of the inverter switching device for the sake of predicting all the possible compensation current values of active power filter. When the evaluation function value turned the smallest, the switch state corresponding to the voltage vector was applied to the next sampling period, acheiving the quick tracking of the harmonic reference current. The evaluation function increased the switching frequency of the additional term, by controlling the number of switching operations to realize the switching frequency drop. The simulation results showed that this control strategy could significantly reduce the switching frequency by optimizing the evaluation function and selecting the appropriate weight coefficient, ensure the balance between switching frequency and grid current, and effectively reduce the switching losses.
Journal Information
Founded in 1986， bimonthly
Administered by：The Education Department Henan Province
Sponsored by：Zhengzhou University of Light Industry
Editor-in-chief：Wei Shizhong
Executive Editor-in-Chief：Zou Lin
Deputy Editor-in-Chief：Qu Shuanghong
Edited & published by：Editorial Department of Journal of Light Industry
CN 41-1437/TS
ISSN 2096-1553
Address：136 Science Avenue, Zhengzhou City, Henan Province, China
Postal Code：450001
Tel：(086)0371-86608635
(086)0371-86608633
