基于虛擬磁鏈和鎖相環(huán)的無電網(wǎng)電壓傳感器并網(wǎng)逆變器的研究

基于虛擬磁鏈和鎖相環(huán)的無電網(wǎng)電壓傳感器并網(wǎng)逆變器的研究:為了提高并網(wǎng)逆變器的可靠性和抗電網(wǎng)電壓波動，同時進一步降低并網(wǎng)逆變器的成本，提出了一種基于
鎖相環(huán)和虛擬電網(wǎng)磁鏈的無電網(wǎng)電壓傳感器的控制策略。根據(jù)并網(wǎng)逆變器在同步旋轉(zhuǎn)坐標系下的數(shù)學(xué)模型，采用虛擬的電網(wǎng)磁鏈矢量定向的矢量控制和d、q 軸電流閉環(huán)控制，這樣實現(xiàn)了d、q 軸電流的解耦控制，使q 軸電流控制有功功率，d 軸電流控制無功功率。實驗結(jié)果看出：采用虛擬的電網(wǎng)磁鏈矢量定向的并網(wǎng)逆變器具有良好的動、靜態(tài)性能。從而驗證了該方案的可行性和正確性。
ABSTRACT: In order to improve reliability and resist grid voltage fluctuation, and further reduce the cost for the grid-connected inverter, the control strategy is presented based on phase lock loop(PLL) and virtual grid flux without grid voltage sensors. The virtual grid flux vector orientation and d-axis current and q-axis current close-loop control are used based on the mathematical model in synchronous rotating frame for the grid-connected inverter, which realizes the decoupling control for d-axis current and q-axis current. The acitve power and the reactive power are independently controlled by q-axis current and d-axis current. Experimental results show that the grid-connected inverter based on PLL and virtual grid flux has good dynamic and static performance. So the feasibility and correctness for the control strategy is verified.
關(guān)鍵詞：鎖相環(huán)；虛擬電網(wǎng)磁鏈；無電網(wǎng)電壓傳感器；解耦控制；電流閉環(huán)
KEY WORDS: PLL; virtual grid flux ; without grid voltage sensors; decoupling control ;current close-loop