针对温控负载变化的虚拟电厂控制策略研究

Research on control strategy for virtual power plants in response to thermostatically controlled loads

温控负载是一种变化剧烈、波动频繁、高峰负荷比例较高的负载,对电网的安全产生了极大的影响。为了应对这一问题,系统的输出功率往往会超过90%负荷最大值的调峰限制。针对虚拟电厂(VPP)系统内的超限过程进行了研究,并提出了2种控制策略,以降低超限总电量或者利用超限电量的同时获取收益。在验证策略的控制效果时,选取了2种由温控负载引起的功率需求的典型变化。研究结果表明,温控负载引起的功率需求峰值的变化对策略具有重要影响。在安全模式下,超限比例与峰值的增加呈反比,而与平均功率的增加呈正比;在收益模式下,峰值变化会影响储能放电过程,平均功率变化则会影响储能充电过程。随着功率需求的增加,收益逐渐减小,收益范围为3.62万~3.25万元。

Thermostatically controlled load(TCL)is of frequent and drastic fluctuations and high-proportion peak load,which threats the safe operation of the power grid.To alleviate the fluctuation,a power system has to raise its load over the peak load regulation constraint of 90%maximum load.To study the over-limit process of a virtual power plant(VPP)system,two control strategies are proposed to reduce the total amount of over-limit electricity and gain profits from the process.Two types of variation laws of the power demand varying with TCLs are selected to study the effectiveness of the strategies.The results show that the peak value of the power demand varying with TCLs has a great impact on the strategies.Under the safe mode,the proportion of over-limit electricity is inversely proportional to the power demand peak value,while is proportional to the average value.Under the profiting mode,since the peak value and average value of power affects the charging and discharge processes,the profit decreases with the increase of power demand,ranging from 36200 to 32500 yuan.