面向配电网电压暂降治理的线路改造优化模型

线路改造是在电网侧进行电压暂降治理的主要方式之一。为了经济、合理地确定线路的改造位置和治理方式,建立了面向配电网电压暂降治理的线路改造优化模型。针对断路器重合闸和熔断器配合保护的配电网,考虑故障位置、故障类型等因素,讨论分析了10种典型的保护动作配合方式,评估了配电网电压暂降持续时间。结合传统电压暂降幅值的计算方法,计算线路改造治理方案的成本及效果。考虑用户电压暂降耐受能力,建立了用户生产中断次数评估模型。定义了电压暂降总支出,以总支出最小为目标,计及技术约束、经济约束、治理范围约束和风险域约束,建立了面向配电网电压暂降治理的线路改造优化模型,并基于人工蜂群算法进行模型求解。以IEEE 33节点系统为算例,考虑治理投资成本充足和不足2种场景,通过仿真验证了所提方法的正确性和实用性。

Optimization model of line reconstruction for voltage sag governance of distribution network

Line reconstruction is one of the main ways of voltage sag governance in power grid side.In order to determine the reconstruction position and governance mode of lines economically and reasonably,an optimization model of line reconstruction oriented to the voltage sag governance of distribution network is established.For the distribution network with coordinated protection of circuit breaker reclosing and fuse,considering fault location,fault type and other factors,10 typical protection operation coordination modes are discussed and analyzed,and the duration of voltage sag is evaluated.Combined with the traditional calculation method of voltage sag amplitude,the cost and effect of line reconstruction scheme are calculated.Considering the user’s voltage sag tolerance,the evaluation model of user’s production interruption times is established.The total voltage sag expenditure is defined,and the optimization model of line reconstruction for voltage sag governance of distribution network is established with the minimum total voltage sag expenditure as its objective,considering the technical constraints,economic constraints,governance region constraints and risk domain constraints.The model is solved by artificial bee colony algorithm.Taking the IEEE 33-bus system as an example,the correctness and practicability of the proposed method are verified by simulation considering two scenarios of sufficient and insufficient governance investment cost.