Research on Evaluation Index System of Microgrid Support Capability Based on Importance of Distributed Power

Abstract

近年来，由台风，地震等自然灾害引起的大规模电网停电事故频发。考虑到微电网中的可控源和负荷具有灵活的功率控制能力，可以支持电网电压和功率。因此，本文提出了一个新的想法：使用微电网通过协调有功和无功来支持安全电网。首先，研究了各种可控源负载的有功和无功功率特性及其对系统电压的影响。其次，通过考虑微电网的功率支撑能力和支撑时间，建立容量支撑能力评价指标；第三，提出了基于有功和无功协调的微电网规划思想，提出了提高微电网支撑能力的微电网规划方法。第四，建立微电网优化模型。考虑电压，潮流和功率输出的约束，利用粒子群算法实现微电网可控源和负荷的最优规划。最后，通过数值算例验证了所提出的微电网规划方法的有效性。 In recent years, large-scale blackouts in power grid caused by natural disasters such as typhoons and earthquakes have occurred frequently. Considering the controllable source and load in the micro-grid have flexible power control capability, which can support the grid voltage and power. So this paper proposes a new idea: using the micro-grid to support secure power grid by coordinating active and reactive power. Firstly, it studies the active and reactive power characteristics of various controllable source loads and their influence on the system voltage; secondly, establishing the evaluation index of capacity support capability, by considering the power support capability and support time of the micro-grid to the guaranteed power grid; thirdly, proposing the micro-grid planning idea based on active and reactive power coordination, and the micro-grid planning method for improving the micro-grid support capacity; fourthly, establishing the micro-grid optimization model. Considering the constraints of voltage, power flow and power output, realizing the optimal planning of controllable source and load in the micro-grid by using XX algorithm. Finally, a numerical case is given to verify the effectiveness of the proposed micro-grid planning method.