基于电压合格率评价函数的地区电压无功优化策略

Regional grid voltage reactive power optimization strategy based on voltage qualification rate evaluation function

传统的地区电网电压无功优化,只考虑保持各母线电压合格,母线下级电网则根据上级电压进行电压调控。但在实际运行中,中低压配电网的电压调控能力往往不足以保证其电压合格率,需要上级电网根据下级电网的实际需求调节其电压。提出了基于电压合格率评价函数的地区电压无功优化策略,通过依次建立低压配网台区、中压片区电压合格率模型,从而形成了低压台区、中压片区和地区电网的三级电压无功优化策略。逐级建立电压合格率评价函数,使得地区电压无功的优化策略中,很好地考虑了对下级电网的电压合格率的影响,解决了上下三级电网的电压无功的协调优化难题。仿真结果表明,该策略大大提高了地区电网的综合电压合格率,具有很高的经济效益。

In traditional regional grid voltage reactive power optimization, only the bus voltage is considered to be within the qualified range, and the medium-low voltage distribution grid is regulated based on the voltage of the upper stage voltage. However, in actual operation, the voltage regulation capability of the medium-low voltage distribution network is often insufficient to ensure its voltage qualification rate, and the upper-level power grid needs to adjust its voltage according to the actual requirements of the lower-level power grid. A regional voltage reactive power optimization strategy based on the voltage qualification rate evaluation function is proposed in this paper. A three-level voltage reactive power optimization strategy for the low-voltage zone, medium-pressure zone and regional power grid is formed by establishing the voltage pass rate model of the low-voltage distribution network zone and medium-pressure zone in turn. The voltage qualification rate evaluation function is established step by step, thus making the regional voltage and reactive power optimization strategy well considered the impact on the voltage qualification rate of the lower-level power grid, and solving the problem of coordination and optimization of voltage and reactive power of the upper and lower three-level power grid. The simulation results show that this strategy greatly improves the comprehensive voltage qualification rate of the regional power grid and has high economic benefits.