一种微电网无功均分的改进控制策略

发布时间：2019-02-23 15:10

【摘要】：受微电网线路阻抗不匹配等因素的影响,传统的下垂控制难以按照下垂增益合理分配无功功率,为了提高微电网中分布式微源输出无功功率的均分精度,又不至于降低电压质量,提出了一种基于同步思想的微电网无功均分改进下垂控制策略。该方法在传统下垂控制的基础上引入了无功补偿和电压恢复机制,利用中央控制器发出的低带宽同步信号的触发,无功补偿机制将修改下垂特性曲线的电压偏置,改善无功出力分配精度,而电压恢复机制则补偿由此造成的输出电压的降低,实现电压恢复。从理论上证明了该算法的稳定性,且仿真和实验结果均表明,改进下垂控制的无功均分方法实现了负荷有功和无功功率的合理均分,并具有良好的动态和稳态性能。
[Abstract]:Under the influence of line impedance mismatch and other factors, traditional droop control is difficult to reasonably distribute reactive power according to droop gain. In order to improve the average distribution accuracy of reactive power output from distributed microsource in microgrid, the traditional droop control is difficult to distribute reactive power according to droop gain. Without reducing voltage quality, an improved droop control strategy based on synchronization is proposed for microgrid reactive power sharing. Based on the traditional droop control, the reactive power compensation and voltage recovery mechanism are introduced, and the voltage bias of the droop characteristic curve is modified by the trigger of the low bandwidth synchronous signal issued by the central controller. The accuracy of reactive power distribution is improved, and the voltage recovery mechanism compensates for the decrease of the output voltage, and realizes the voltage recovery. The stability of the algorithm is proved theoretically, and the simulation and experimental results show that the improved droop control method realizes the reasonable equal distribution of active and reactive power, and has good dynamic and steady-state performance.
【作者单位】：中南大学信息科学与工程学院;
【基金】：国家自然科学基金项目(61174125)~~
【分类号】：TM714.3

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