谐波补偿式能馈电子模拟负载设计

摘要

采用两级电路结构设计了一种谐波补偿式能馈电子模拟负载,两级电路包括BOOST电路和三相DC/AC逆变电路,将逆变电路的输出端与被测电源的输入端相连.前级BOOST电路采用电流PI控制算法跟踪给定的负载特性;后级逆变电路采用ip-iq法对被测电源的输入电流进行基波分离,并由直流母线电压调制基波电流的幅值,结合三相静止坐标系的电流PI算法,提出能量回馈和谐波补偿算法,跟踪调制后的被测电源的输入电流.仿真结果表明,采用该电路结构和控制方案,前级能准确地模拟设定的负载特性,后级将BOOST电路输出的能量回馈到被测电源输入端,达到减小电网的输入电流并使其谐波含量最小化的效果.%A novel harmonic-compensate-type energy-feedback electronic analog load is presented in this paper,which is designed with two-stage circuit structure combining a BOOST circuit and a three-phase DC/AC inverter circuit.The output of the inverter circuit is connected with the input of the measured power supply.The current PI control algorithm is used for the pre-stage BOOST circuit to track the given load.The post-stage inverter circuit applies the ip-iq method to separate the base wave from the input current of the measured power supply and adjusts the amplitude of the fundamental current by the DC bus voltage.Meanwhile,combined with the three-phase static coordinate system current PI algorithm,an energy-feedback and harmonic-compensation algorithm is proposed to track the modulated input current of the measured supply.The simulation results show that the circuit structure and control scheme can be used to simulate the given load accurately and feed the energy from the BOOST circuit back to the input of the measured power supply,so that it can reduce the input current of the power grid and minimize its harmonic content.