外文翻譯---單相spwm逆變器并聯(lián)解耦控制策略(已修改)
2025-01-29 23:27 本頁(yè)面
【正文】 附錄6 外文文獻(xiàn)Decoupling Control Strategy for Single Phase SPWM Parallel InvertersShunGang Xu,JianPing Xu,and TaiQiang Cao1. IntroductionParallel operation of inverters is an efficient way to enhance the capacity and reliability of inverter systems. The key issue of parallel operation is the distribution of the load current. In an inverter parallel system, the amplitudes and phases of output voltages of all inverters should strictly equal to each other to guarantee that each inverter shares the same load current. Otherwise, the current circumfluence and overload of some inverters in the inverter parallel system may exist. The current circumfluence may also decrease the efficiency and reliability of the inverter parallel system.There are various techniques for the control of inverter parallel operation. Among these techniques, central control and masterslave control are easy to implement and have good currentsharing performance. However, these two control strategies work at the cost of system reliability because of conjunction operation among inverters.In instantaneouscurrent control of inverter parallel system, there is a current bus to share the current signal among inverters and the instantaneous circumfluence is used to regulate the output current, each inverter has good transient performance and the parallel system has good current sharing performance. However, its analog signal munication is easy to be disturbed and the signal isolation is plicated, which decrease the reliability of the parallel system. Independent control without interconnection droops the output voltage and frequency of inverters, the link among inverters is only via power lines. Thus fewer interconnections are needed and the reliability of inverter parallel systems is improved. Traditionally, this control strategy assumes the output impedance of inverters is mainly inductive due to high inductive ponent of the line impedance and the large inductor filter. Thus active powerfrequency droop and reactive powervoltage droop schemes are adopted. However, this is not always true as the closedloop output impedance also depends on the control strategy, and the line impedance is predominantly resistive for low voltage cabling. Thus, there is coupling relationship between output active/reactive power and frequency/amplitude of the output voltage. Traditional independence control may lead to instability of inverter parallel systems.In this paper, a decoupling control strategy for inverter parallel systems is proposed. The active power and reactive power of inverters in a parallel system are calculate by their corresponding output voltage and output current, and the output power information is shared by controller area network(CAN)bus
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