基于鉴相原理的单相有源滤波器仿真研究
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摘要
准确、实时的检测出电网电流中的谐波电流是电力有源滤波器进行精确补偿的关键。基于鉴相原理的瞬时电流检测方法不需要分离出各次谐波分量,只需检测出负载电流中除基波分量以外的总畸变电流,再通过PWM逆变控制模块采用适当的控制方法使逆变主电路产生大小相等、方向相反的谐波分量注入到电网中,用以消除负载电流中谐波分量的方法达到补偿谐波的目的。仿真结果表明,电网接入电感负载时,电流的总畸变率达到了46.59%,而加入具有鉴相检波的单相有源滤波器后,电流的总畸变率下降到了4.55%,完全满足了要求,达到了动态跟踪谐波补偿的目的。
Accurate and real-time detection of harmonic current in grid current is the key to accurate compensation of active power filter. The instantaneous current detection method based on phase discrimination principle does not need to separate each harmonic component. It only needs to detect the total distortion current in the load current except the fundamental component. Then,the PWM inverter control module adopts appropriate control method to inject the harmonic component of the main circuit of the inverter into the power grid with the same magnitude and opposite direction. The method for eliminating the harmonic component in the load current is used to compensate the harmonic. The simulation results show that the total current distortion rate reaches 46.59%when the grid is connected to the inductance load,while the total current distortion rate decreases to 4.55% when the single-phase active filter with phase detection is added,which fully meets the requirements and achieves the purpose of dynamic tracking harmonic compensation.
Accurate and real-time detection of harmonic current in grid current is the key to accurate compensation of active power filter. The instantaneous current detection method based on phase discrimination principle does not need to separate each harmonic component. It only needs to detect the total distortion current in the load current except the fundamental component. Then,the PWM inverter control module adopts appropriate control method to inject the harmonic component of the main circuit of the inverter into the power grid with the same magnitude and opposite direction. The method for eliminating the harmonic component in the load current is used to compensate the harmonic. The simulation results show that the total current distortion rate reaches 46.59%when the grid is connected to the inductance load,while the total current distortion rate decreases to 4.55% when the single-phase active filter with phase detection is added,which fully meets the requirements and achieves the purpose of dynamic tracking harmonic compensation.
引文
[1]谭喜堂,王慕将,朱琴跃,章天宇,张又华.有源滤波器中改进型自适应谐波电流检测算法[J].大功率变流技术,2017(1):68-72.
[2]王文新,姜吉顺,张宗超,焦提操.一种用于有源滤波器的改进谐波检测法[J].科学技术与工程,2018(6):198-203.
[3]翟羽,赵景波,王响等.有源电力滤波器应用技术研究[J].工业控制计算机,2017,30(3):136-137.
[4]吴季波,张志文.新型单周控制单相有源滤波器的研究[J].微计算机信息,2008,24(11):244-247.
[5]杨佳能.有源电力滤波器补偿性能研究[D].合肥工业大学,2017.
[2]王文新,姜吉顺,张宗超,焦提操.一种用于有源滤波器的改进谐波检测法[J].科学技术与工程,2018(6):198-203.
[3]翟羽,赵景波,王响等.有源电力滤波器应用技术研究[J].工业控制计算机,2017,30(3):136-137.
[4]吴季波,张志文.新型单周控制单相有源滤波器的研究[J].微计算机信息,2008,24(11):244-247.
[5]杨佳能.有源电力滤波器补偿性能研究[D].合肥工业大学,2017.