摘要
通过增加畸变相位闭环控制环节准确锁定基波正序电压初相角,提出了一种能在电网电压不平衡或畸变时准确检测出基波正序有功电流和无功电流的谐波和无功电流检测算法,且可直接适用于三相三线或四线系统;给出了一种能在电网电压不平衡或畸变时对基波正序无功功率进行独立补偿的解耦控制方案。基于所提检测方法及控制方案,四桥臂三相四线并联型APF-STATCOM能在电网电压不理想和负载不对称且非线性的条件下实现用同一原理同时实现谐波抑制、无功和负载不平衡补偿这几种功能。理论推导验证了所提检测方法的正确性,基于Matlab/Simulink的仿真结果证明了所提检测方法及控制方案的有效性,并且具有良好的动态特性和快捷的无功阶跃响应。
A new detection method for harmonic and reactive currents is proposed,which can detect positive fundamental active currents and reactive currents under non-ideal mains voltage conditions and can be used for three-phase three-wire or four-wire systems directly.The distortion phase control tache is included in the proposed method in order to lock positive fundamental voltage phase.A decoupling control strategy is also presented to compensate positive fundamental reactive power absolutely in the case of unbalanced or distorted voltage.On the basis of the proposed detection method and control strategy,the three-phase four-wire shunt APF-STATCOM using a four-leg converter can realize harmonic elimination,reactive power and load imbalance compensation simultaneously under unbalanced non-linear loads and non-ideal mains voltage conditions.The theoretical analysis verifies the correctness of the proposed detection method.Simulation results based on Matlab/Simulink show the feasibility,the excellent dynamic performance and the good reactive power response of the proposed detection method and control strategy.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第16期11-17,共7页
Power System Protection and Control
基金
教育部新世纪优秀人才支持计划资助
关键词
检测
谐波、无功和负载不平衡补偿
有源滤波器
静止同步补偿器
detection
harmonic
reactive and load imbalance compensation
active power filter（APF）
static synchronous compensator（STATCOM）
