外文翻譯---單相spwm逆變器并聯(lián)解耦控制策略-文庫(kù)吧
2025-01-02 23:27 本頁(yè)面
【正文】 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 inverter, is a proportional coefficient. In ,the power stage includes a fullbridge configuration and an LC filter, is DC link voltage, to are power switches, L and C are filter inductor and capacitor,is a sinusoidal reference voltage signal of the inverter,is the sum of inductor equivalent series resistance, switch onresistance, and connectionline resistance. According to nonlinear control and feedback linearization theory, openloop averaged output voltage can be characterized by (1)where means the average value of x over one switching cycle and u is the control variable, which can take the values 1,0,or1,depending on the state of switches , the dual closedloop feedback control inverter shown in ,the controller can be characterized by (2)From (1) and (2) ,the dynamic characteristics of the closedloop output voltage can be expressed in Laplace domain as (3)The single phase dual closedloop inverter can be modeled by two terminal equivalent circuits as (4) (5) (6) diagram of Single phase dual closedloop inverter.Frequency (rad/sec)(a)Frequency (rad/sec)(b) diagram of the voltage gain and the equivalent outputimpedance of the dual closedloop inverter:(a)magnitude vs.frequency and(b)phase . equivalent circuit.where is the voltage gain andis the equivalent output impedance. The bode diagram ofandare shown in . From (6), we can know that the equivalent output impedance is closely related to the parameters of the output filter and the feedback control parameters. Let R be the resistive ponent and X the inductive ponent of equivalent impedance Z(s).The inverter equivalent circuit can be sh
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1