考虑重构的含可再生能源配电网电压控制模型与算法

风电、光伏等分布式电源高渗透并入10kV中压配电网,将导致系统运行经济性与电压质量等问题,若不加以有效管控,则难以充分消纳可再生能源。为实现可再生能源接入下配电网电压安全的主动管控,提出兼顾配电网结构灵活性与电压调节资源能力的机会约束双层优化模型。模型上层以配电网动态重构为手段,确保长时间尺度内的经济运行原则;下层以馈线自动调压器控制策略为对象,实现局部支路电压水平优化。为提高算法效率,利用二阶锥法松弛潮流约束,并采用库恩—塔克(KKT)条件将模型等效转化为单层决策模型。算例结果表明,所提方法通过主动重构技术协调局部电压调节资源,可实现可再生能源接入下配电网的电压安全运行控制。

Reconfiguration Based Model and Algorithm of Voltage Regulating for Distribution Network with Renewable Energy

Operation efficiency and voltage risk of distribution networks have arisen along with the increasing penetration of non-determining distributed generators. To enable active voltage management for distributed generator(DG)equipped distribution network(DN), a chance constrained bi-level optimization model is proposed by taking into account the topological flexibility and diverse voltage control resources of DN. The upper level of the presented model aims to ensure long-term economical operation by means of dynamic reconfiguration. The lower level, however, using the step voltage regulator(SVR)as a controllable object, achieves voltage optimization for the local branch. In order to improve algorithm efficiency, the second-order cone relaxation algorithm and Karush-Kuhn-Tucker(KKT)are used to reduce the bi-level planning problem to a single optimization model. The example simulation results show that the method can realize safe operation of distribution network voltage with renewable energy access by active reconfiguration and coordination of local voltage regulation resources.