含光伏接入的中压配电网集中调控优化策略

Centralized Regulation and Optimization Strategy for MV Distribution Network with PV Integration

随着并网光伏数量和容量的增加,中压配电网电压波动及网损过大等问题日益突出。为此计及中压配电网的通信条件与计算能力等特点,提出了一种面向中压配电网的分布式光伏集中调控优化策略,抑制中压配电网电压波动及网损过大。分析光伏并网对配电网电压及网损影响,构建了以中压配电网潮流平衡方程、节点电压、支路电流及系统运行为约束,以网损最小、电压波动最小和分布式电源消纳最大为目标的多目标优化控制模型;采用商用CPLEX对模型进行求解;最后结合算例仿真对模型进行了有效性验证。结果表明,所提优化控制模型可有效降低配电网电压波动,合理分配分布式电源出力,降低网络损耗,同时保证光伏利用率处于相对合理区间。

With increasing PV connected to MV distribution network,the problem of node voltage fluctuation and network loss is becoming more and more serious.Taking the communication conditions and calculation capabilities of MV distribution networks into account,a centralized regulation optimization strategy for distributed PV connected to MV distribution network is proposed to realize the suppression of voltage fluctuation and excessive network loss.Firstly,the impacts of PV integration on node voltage and network loss are analyzed.Then,a multi-objective optimal control model is established,with the power flow balance equation,node voltage,branch current and system operation as constrains,and with the minimal network loss,minimal voltage fluctuation and maximum consumption of DGs as objective.In addition,the commercial CPLEX is used to solve the model.Finally,the effectiveness of the proposed model is verified through case simulation.The results show that the proposed model can effectively reduce the voltage fluctuation and network loss,reasonably allocate the output of DGs and ensure the utilization of PV in a reasonable range.