外文翻譯---單相spwm逆變器并聯(lián)解耦控制策略-文庫(kù)吧資料
2025-01-23 23:27本頁(yè)面
【正文】 stantaneouscurrent 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 munication. Then the active and reactive power circumfluence of each inverter is calculated and applied to regulate its corresponding output voltage and output frequency by decoupling of the power circumfluence, respectively. Thus, the proposed decoupling control strategy overes the disadvantages of inverter parallel systems controlled by independence control without intermunication and instantaneouscurrent control. The inverter parallel system implemented by this strategy can achieve better currentsharing performance, good stability, and good reliability.2. Analysis of Single Phase PWM InverterDual closedloop feedback control is usually adopted to control single phase shows a dual closedloop feedback control scheme with an inductorcurrent inner loop and a capacitor voltage outer loop. The capacitorvoltage outer loop adopts proportionintegral control to regulate output voltage, where andare proportional coefficient and integral coefficient, respectively. The inductorcurrent inner loop uses proportional control to enhance the transient response of the inv
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