CAJ | 학술논문

将下垂控制应用于逆变器电压型并网控制系统中，可以实现逆变器在孤岛和并网两种运行模式间无缝切换。针对低压电力线的阻抗特点，提出新型光伏逆变器电压型并网控制策略。在阻性下垂控制的基础上增加功率环和直流母线电压环，解决电压控制型逆变器并网功率易受电网波动影响等问题，增强了光伏逆变器对功率的控制能力，满足始终以最大有功功率并网和维持直流母线电压稳定的要求。实验结果验证了所提控制方法的有效性。
장하수공제응용우역변기전압형병망공제계통중，가이실현역변기재고도화병망량충운행모식간무봉절환。침대저압전력선적조항특점，제출신형광복역변기전압형병망공제책략。재조성하수공제적기출상증가공솔배화직류모선전압배，해결전압공제형역변기병망공솔역수전망파동영향등문제，증강료광복역변기대공솔적공제능력，만족시종이최대유공공솔병망화유지직류모선전압은정적요구。실험결과험증료소제공제방법적유효성。
Droop control is used in PV inverter system, which can achieve seamless switching between grid-connected mode and islanded mode. According to the characteristic impedance of low-voltage electrical wires, a novel voltage-controlled method for grid-connected PV inverter is proposed in this paper. By adding a power loop and a DC-link voltage loop to droop control, the power of inverter cannot be influenced by grid fluctuation, the power control ability of PV inverter is strengthened, PV inverter can output maximum active power into grid and the dc-bus voltage is stable. The validity of the proposed method is verified by experimental results.