考虑多时段并网点电压控制的光储容量匹配及优化运行

Capacity Matching and Optimal Operation of Photovoltaic-Storage Systems Based on Multi-Period PCC Voltage Control

在主动管理模式下,通过在光伏并网点配置储能系统可平滑光伏出力,并使其主动参与配电网调度。运用扩展QV节点对光储并网点运行特性进行合理描述,提出一种综合考虑源荷峰谷特性多时段设定光储并网点运行电压的方法。考虑系统运行约束、储能系统运行约束和容量配置约束,从全天关口电量以及储能配置容量两方面构建光储联合系统储能容量匹配多目标优化模型,求取Pareto最优解集,从而为储能容量配置及运行策略提供决策依据。IEEE33节点配电网算例表明,所提方法能够灵活实现储能容量的优化配置,相应的运行策略下储能系统的运行状态均在合理有效区间内,对比表明所提运行策略在提高电压质量、减少储能配置容量及降低全天网损电量方面具有显著效果,验证了多时段并网点电压设定方法及优化模型的合理性和有效性。

In active management mode, energy storage system （ESS） could smooth photovoltaic （PV） power output and make them participate in dispatching actively. Extended QV bus-type was used to describe operation feature of point of common coupling （PCC） PV and ESS accessed to reasonably in the paper. Then a method for multi-period PCC voltage setting considering source-load peak-valley characteristics was proposed. Considering system and ESS operation constraints and ESS capacity allocation constraints, a multi-objective optimization model of ESS capacity configuration was constructed based on two aspects of whole day gateway energy and ESS capacity, solving Pareto optimal solution set to provide decision-making basis for ESS capacity configuration and operation strategy. IEEE 33-bus study case shows that the proposed method could achieve ESS optimal allocation flexibly, and ESS operation states are all in reasonable range under corresponding operation strategy. Result comparison shows that the proposed operation strategy has significant effect on improving voltage quality, decreasing ESS capacity and reducing whole day energy loss. The results demonstrate rationality and validity of the optimal model and the method for multi-period PCC voltage setting.