考虑光储一体化系统柔性调节能力的配电网电压优化策略

Voltage optimization strategy for distribution network considering flexible regulation capability of PV integrated energy storage system

针对高比例光伏接入城市配电网引发的电压质量问题,本文提出了考虑光储一体化系统(PIESS)柔性调节能力的配电网电压优化策略。首先,分析三种典型的“光伏+广义储能”一体化运行场景,并建立三种场景下广义储能的运行模型,进一步提出PIESS的运行模型;然后,分析PIESS的柔性调节潜力,并计算PIESS有功和无功约束的统一表达式;最后,将PIESS的运行模型及功率约束纳入配电网的电压优化模型,并处理为混合整数二阶锥规划模型进行求解。在改造的IEEE 33节点系统中验证了所提模型的调压效果,结果表明PIESS能有效改善配电网电压分布,充分利用不同类型“光伏+广义储能”的柔性调节能力能保障配电网的安全经济运行。

To address the voltage quality issue caused by the high proportion of photovoltaic(PV)in urban distribution network,this paper proposes a voltage optimization strategy considering the flexible regulation capability of the photovoltaic integrated energy storage system(PIESS).Firstly,three typical operation scenarios of“photovoltaic+general energy storage”are analyzed.Furthermore,the operation models of general energy storage and PIESS under the three scenarios are established,successively.Then,the flexible regulation potential of PIESS is analyzed,and the general formulations of the active and reactive power constraints for PIESS are proposed.Finally,the voltage optimization model of distribution network,which incorporates the operation models and power constraints of PIESS,is reformulated as a mixed-integer second-order cone programming problem.The effectiveness of voltage regulation for the proposed model is verified in a modified IEEE-33 bus test system.The results indicate that PIESS can effectively optimize the voltage profile of distribution network,and the flexible regulation capabilities of different“photovoltaic+general energy storage”systems can be completely exploited to ensure the security and economic operation of the distribution network.