两阶段鲁棒优化调度的光伏逆变器集中接入主动配电网研究

Research on centralized access of photovoltaic inverters to active distribution network based on two-stage robust optimal scheduling

常规方法约束鲁棒优化目标函数时,忽略了光伏逆变器无功辅助约束条件,导致配电网优化后弃光费用和购电成本较高,为此提出了接入光伏逆变器的鲁棒优化调度方法。以最小化总预期成本为目标,计算两阶段鲁棒优化目标函数。第一阶段选取光伏能源、波动性负荷等调度成本;第二阶段选取弃光和失负荷的惩罚成本,通过支路潮流、配电网充放电功率限制,约束第一阶段目标函数;根据光伏逆变器无功辅助服务、逆变器接入节点电压等,约束第二阶段目标函数,构建鲁棒优化模型,搜索模型最优解,选取预期成本最小化的调度决策。选取电-热联供型配电网,接入6个光伏逆变器,设置对比实验,结果表明,针对不同波动范围恶劣场景,设计方法相比常规方法,减少了弃光费用和购电成本,降低了弃光和失负荷量。

When constraining robust optimization objective function,conventional methods ignore the reactive power auxiliary constraint conditions of photovoltaic inverter,which leads to high cost of light abandonment and electricity purchase after optimization of distribution network.For this reason,a robust optimal scheduling method connected with photovoltaic inverters is proposed.To minimize the total expected cost,a two-stage robust optimization objective function was calculated.In the first stage,scheduling costs such as photovoltaic energy and fluctuating load were selected,and in the second stage,penalty costs of light abandonment and load loss were selected.The objective function in the first stage was constrained through the restrictions of branch flow and charging and discharging power of distribution network.According to the photovoltaic inverter reactive power auxiliary service and inverter access node voltage,etc.,the objective function of the second stage is constrained to build a robust optimal model,search the optimal solution of the model,and select the scheduling decision that minimizes the expected cost.The power-heat combined distribution network was selected,6 photovoltaic inverters were connected,and the comparative experiment was set.The results show that,for bad scenes with different fluctuation ranges,the design method reduced the cost of light abandonment and electricity purchase,as well as the amount of light abandonment and load loss compared with the conventional method.