| 引用本文: | 连建阳,谢 川,陈国柱.三相四线级联DSTATCOM高性能控制新策略[J].电力自动化设备,2011,31(1): |
| LIAN Jianyang,XIE Chuan,CHEN Guozhu.High performance control strategy based on three-phase four-wire cascaded DSTATCOM[J].Electric Power Automation Equipment,2011,31(1): |
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| 摘要: |
| 针对三相四线级联DSTATCOM三相输出电流彼此独立的特点，建立了DSTATCOM的单相模型和基于数字PI的闭环传递函数，提出了一种基于重复控制的单相控制组合的控制策略。该控制策略能够将传统PI控制系统闭环传递函数的相位滞后从56° 降低到5° 以内（1 kHz处），从而可以改善对谐波和无功的补偿效果。在Matlab/Simulink环境下，建立10 Mvar/10 kV 19电平的级联三相四线DSTATCOM系统仿真模型，通过仿真验证了新控制策略的正确性和可行性。同时，在三相不平衡负载情况下的仿真结果表明，新控制策略比传统的基于三相dq变换的控制策略有更好的补偿效果，而且具有分相补偿能力。 |
| 关键词: DSTATCOM 级联多电平 重复控制 不平衡负荷补偿 |
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| High performance control strategy based on three-phase four-wire cascaded DSTATCOM |
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LIAN Jianyang, XIE Chuan, CHEN Guozhu
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College of Electrical Engineering，Zhejiang University，Hangzhou 310027，China
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| Abstract: |
| With the consideration that the output currents of three-phase four-wire cascade DSTATCOM（Distribution STATic synchronous COMpensator） are independent，its single-phase model and close-loop transfer function are established based on digital PI and a control strategy including three single-phase controllers is proposed based on repetitive control. Compared with the traditional PI control，the proposed strategy decreases the system phase lag from 56° to 5°（at 1 kHz），significantly improving the reactive power and harmonics compensation effect. Simulation model of 10 Mvar/10 kV 19-level three-phase four-wire cascaded DSTATCOM is established under Matlab/Simulink environment. Simulative results verify the validity of theoretical analysis. Under the condition of unbalance three-phase load，the proposed control strategy，with the phase-splitting compensation ability，has better performance than the traditional one based on dq transformation. |
| Key words: DSTATCOM cascaded multilevel inverter repetitive control unbalanced load compensation |
