【作者】 刘聪； 戴珂； 张树全； 段科威； 康勇；

【Author】 Cong LIU,Ke DAI,Shuquan ZHANG,Kewei DUAN,Yong KANG (State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

【机构】 强电磁工程与新技术国家重点实验室 华中科技大学；

【摘要】 作为可再生能源与电网的接口,并网逆变器在分布式发电系统中起着关键的作用。本文对分布式发电并网逆变器实现有源滤波与无功补偿功能进行了研究,提出一种基于负载电流检测的实现方案。检测到的三相负载电流经abc/dq变换至同步旋转坐标下,对其d、q轴分量分别进行高通和低通滤波提取出负载电流的谐波与无功电流分量,然后与基波有功电流指令合成,得到逆变器的输出电流指令。电流跟踪控制采用PI+重复复合控制策略,保证了对输出电流指令的准确与快速跟踪。仿真模拟了逆变器各种电流输出工作模式,结果表明并网逆变器可以在输送有功电流的同时进行无功和谐波补偿,有助于改善电网的电能质量。更多还原

【Abstract】 As the interface of the renewable energy and electrical grid,the grid-connected inverter plays a key role in a distributed generation system.This paper deals with the implementation of active filtering and reactive compensation on the grid-connected inverter,and proposes a solution based on load current detection.The detected three phase load currents are transform to the synchronous coordinate frame through an abc/dq transformation,the harmonic and reactive components are extracted by a high-pass or low-pass filter from the d-axis and q-axis components. Then the output current references of the inverter are obtained by synthesis the extracted currents with the fundamental active current.Output current control is realized by a PI+RP compound control algorithm,which ensures the accurate and quick following to the reference.Some kind of current-output operating mode are simulated,the results show that the inverter could compensate reactive and harmonic current and transfer the active power at the mean time,which is helpful to the improvement of the power quality.更多还原