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中文摘要：
针对微电网中存在的电能质量问题，提出了基于变约束预测理论的UPQC控制方法。该方法通过在线优化方法构建当前反馈矩阵的凸组合系数，获得当前控制量，由不同稳定椭圆域确定其对应的控制约束，有效地增加了在线求解的自由度，减少了运算时间。仿真结果表明，该方法能够补偿谐波畸变和抑制电压波动，有效地改善电能质量。
英文摘要：
According to the power quality problems in micorgrid, proposes a UPQC control method based on variable constraint predictive theory. It constructs the convex combination coefficients for the state feedback matrix through on-line optimization, obtains the current control and determines the corresponding control constraints according to the elliptical stability domain, which increases the freedom of online solving and reduces computing time. Simulation results show that the method compensates the harmonic distortions, restrains voltage fluctuation and imoroves tower aualitv effectively.
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