计及分布式电源精确特性的配电网动态无功优化
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国家自然科学基金资助项目(51177067);辽宁省自然科学基金资助项目(201602359)


Dynamic Reactive Power Optimization of Distribution Network Considering Accurate Characteristics of Distributed Generation
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    提出一种精确计及分布式电源DG特性的配电网动态无功优化的有效方法。根据不同类型DG的运行控制方式,用二阶锥松弛适当处理PQ、PV、PI和PQ(V)4种类型DG的并网潮流约束,将非凸的交流潮流方程近似地转化为凸的二阶锥约束,并通过设置优化目标函数驱使松弛误差趋近于0,把配电网的动态无功优化问题转化为凸的混合整数二阶锥规划问题。降低求解复杂度,提高优化精度,保证全局最优,保证支路电压、电流安全约束同时考虑储能装置,离散无功补偿电容器作用于配电网的约束。以多时段有功网损最小为优化目标,建立计及分布式电源精确特性的配电网动态无功优化模型,根据调度周期内预测的各时段的DG出力和负荷曲线,以IEEE69节点系统为例进行仿真实验,验证所提方法的有效性。

    Abstract:

    An effective method for the dynamic reactive power optimization of distribution network is proposed based on the accurate characteristics of distributed generation (DG). According to the operation control modes of different types of DG, PQ, PV, PI and PQ(V) are properly processed by means of second-order cone relaxation, and the non-convex AC power flow equation is approximately transformed into a convex second-order cone constraint. In addition, the optimization objective function is configured to drive the slack error close to zero, thus transforming the dynamic reactive power optimization problem of distribution network into a convex mixed-integer second-order cone programming problem. In this way, the solution complexity is reduced and the optimization accuracy is improved, which ensures global optimization and branch voltage and current safety constraints while considering energy storage devices. In particular, discrete reactive power compensation capacitors act on the distribution network constraints. With the minimum active power loss in multiple periods as the optimization objective, a dynamic reactive power optimization model for distributed network is built, which takes into account the accurate characteristics of DGs. Based on the DG output and load curves predicted during the scheduling period, an IEEE 69-bus system is simulated, and results verify the effectiveness of the proposed method.

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荣德生,刘山林,刘健辰,宁博.计及分布式电源精确特性的配电网动态无功优化[J].电源学报,2021,19(1):82-89

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  • 收稿日期:2018-06-06
  • 最后修改日期:2020-12-23
  • 录用日期:2018-10-15
  • 在线发布日期: 2021-01-21