摘要
为治理非线性不平衡负载的电能质量问题,研究一种简化型三电平有源电能质量补偿器。它由三相二臂三电平逆变器与直流均压电路组成。在分析逆变器的结构和数学模型的基础上,推导逆变器的无差拍控制公式。由于两开关臂在无差拍控制上有耦合关系,为此前馈解耦方法被用来实现两个三电平开关臂的独立控制,提高系统的稳定性。针对直流侧均压问题,采用一种小容量的均压电路,并提出基于电流闭环的均压控制方法,可实现直流侧电压动态均衡。最后,仿真和实验结果验证了所提出结构和控制方法的正确性。
A simplified three-level active power quality compensator was discussed to manage power quality of nonlinear and unbanlanced loads, which consists of a three-phase two-leg inverter and a voltage-balance circuit. Based on the analysis of the switch model, the deadbeat control equations of inverter were derived, and then the feedforward decoupling method was used to eliminate the coupling relation of two switch legs in equations to achieve an independent control for them. For the voltage-balance problem, a voltage-balance circuit of small capacity was adopted, and a voltage-balance control based on the current closed-loop was proposed to achieve the dynamic balance of DC-link voltage. Finally, simulation and experimental results verified the correctness of the proposed structure and control method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第15期55-62,14,共8页
Proceedings of the CSEE
基金
"十一五"国家科技支撑计划重大项目(2009BAG12A09)~~
关键词
三电平逆变器
三相二臂
负序补偿
前馈解耦
无差拍控制
电能质量
three-level converter
three-phase two-leg
negative sequence compensation
feedforward decoupling
deadbeat control
power quality
作者简介
马伏军(1985),男,博士研究生,主要从事有源电力滤波、无功补偿以及配电网电能质量补偿和电气节能技术方面的研究,mafujun2004@163.com.
罗安(1957),男,教授,博士生导师,主要从事先进电能质量控制技术的教学与科研工作;
涂春鸣(1976),男,博士生导师,主要从事先进有源电力滤波器和无功补偿方面的研究。