CAJ | 학술논문

针对低压微网线路阻抗一般呈现阻感混合性，经典的下垂控制方程不再适用，采用一种在传统电压电流双环上加入虚拟阻抗的方法，降低逆变器功率均分控制对输出线路阻抗的敏感性。此外，传统无功功率控制缺少积分环节，使得孤岛情况下输出电压有静差，采用一种改进的功率控制方法，使得最终实现微源输出电压无静差，并且无功输出与线路连接阻抗无关。仿真结果验证，具有抑制环流能力的改进下垂控制器可以消除微源之间的环流并且微源输出电压与参考值无静差，基于DSP的样机实验结果再次验证该方法的正确性和可靠性。
침대저압미망선로조항일반정현조감혼합성，경전적하수공제방정불재괄용，채용일충재전통전압전류쌍배상가입허의조항적방법，강저역변기공솔균분공제대수출선로조항적민감성。차외，전통무공공솔공제결소적분배절，사득고도정황하수출전압유정차，채용일충개진적공솔공제방법，사득최종실현미원수출전압무정차，병차무공수출여선로련접조항무관。방진결과험증，구유억제배류능력적개진하수공제기가이소제미원지간적배류병차미원수출전압여삼고치무정차，기우DSP적양궤실험결과재차험증해방법적정학성화가고성。
For low-voltage micro-grid lines generally mix resistive and inductive impedance, classic droop control equation is no longer applicable. An improved method which adds virtual impedance in the voltage-current dual loop controller is adopted, which reduces the sensitivity of inverter power sharing control for the output line impedance. In addition, the reactive power controller without integral element in the traditional power control loop makes output voltage have static error in the island situation, so an improved power controller is adopted to make the micro-source output voltage have no static error, at the same time the reactive power output is not associated with output line impedance. The simulation results prove that the improved droop controller with circulating current restraining capability has the ability to control circulating current and make the output voltage have no static error, and the prototype experiments based on DSP verify that the proposed control method is correct and reliable.