计及群控电热泵的微网联络线功率平滑策略

Microgrid tie-line power smoothing strategy considering group control of electric heat pumps

为有效平滑电-热联合型微网的联络线功率波动,提出一种基于电热泵和蓄电池的协同控制策略。考虑电热联合微网的运行特征及能量交互方式,基于电热泵的运行特性建立电-热能量转换模型。通过分析电热泵群优先度序列,计算电热泵群可运行数量与状态切换序号指针。考虑机组启停的调控限制,采用集群控制算法计算电热泵群开关序列。基于储能荷电状态以及电热泵实际出力状态,分别建立蓄电池、电热泵功率分配权函数,将联络线的波动功率在蓄电池与电热泵群间进行分配。算例结果表明,该策略能够通过电-热能量协同控制实现微网联络线功率平滑,同时提升电-热联合型微网的互补经济性与能量综合利用效率。

A coordinated control strategy based on the electric HP（Heat Pump） and battery is put forward to smooth the tie-line power fluctuation of CPH（Combined Power-Heat） microgrid. With the consideration of its operating characteristics and energy conversion mode,an electric-thermal energy conversion model based on the operating characteristics of HP is established. The priority sequence of HP groups is analyzed,the quantity of available HP groups and the pointer of state switching number being calculated. A centralized control algorithm considering the constraints of unit start-stop control is adopted to calculate the switching sequence of HP groups. Based on the SOC of ESS （Energy Storage System） and the actual output power of HP,the power allocation weight functions of ESS and HPs are built respectively and the fluctuating power of tie-line is allocated between ESS and HP groups. Results of case study show that,the proposed strategy smoothes the microgrid tie-line power through the coordinated electric-thermal energy control while improves the complementary economy and the comprehensive energy utilization efficiency of CPH rnicrogrid.