(1. 国网湖南省电力公司衡阳供电分公司, 湖南省衡阳市 421001; 2. 新疆大学电气工程学院, 新疆维吾尔自治区乌鲁木齐市 830047)
引入微网总负荷与风光等间歇性能源出力的差值——等效负荷作为具有稳定可控输出的微电源总发电参考量进行研究。通过在微网需求侧向能量管理系统(EMS)预约,储水式电热水器(WSH)群进行响应以平滑微网等效负荷功率波动。首先,建立了等效负荷的模型、基于反向变化频次比的风光出力跟随总负荷功率波动状况的评价指标,并分析了需求侧WSH群响应参与微网能量管理的可行性,计及WSH的传导能量、换位能量和加热能量,建立了WSH群的温度模型。其次,依据需求侧预约用水或常规用水时间、量值和用户主动控制及WSH温度上限,建立动态可控WSH群并计算其反向温度值,根据反向温度值排序结果将投入待机WSH与切除加热WSH两个过程统一,形成了基于需求侧预约WSH群响应的平滑微网等效负荷功率波动控制策略。最后,应用某微网实际案例数据验证了该控制策略的有效性。
国家国际科技合作专项资助项目(2013DFG61520)
(1. Hengyang Power Supply Company, State Grid Hunan Electric Power Company, Hengyang 421001, China; 2. School of Electrical Engineering, Xinjiang University, Urumqi 830047, China)
The equivalent load is proposed as the total reference value of power generators with stable and controllable output in microgrids based on the difference between total load and combined wind-solar power. By reserving in the demand-side to energy management system(EMS), water-storage heater(WSH)group responses control signal to suppress power fluctuations of equivalent load in microgrids. Firstly, the equivalent load model and evaluation indicator based on reservation change frequency of combined wind-solar power are established, the feasibility analysis of WSH group in demand-side participating in energy management in a microgrid is conducted, temperature model of WSH group is set up by considering conduction energy, transposition energy and heating energy. Secondly, considering the time and amount of demand-side reservation water or conventional water, user active control and WSH temperature upper limit values, dynamic controllable WSH group is set up and it's reverse temperature value is calculated. According to sorted reverse temperature value, two process of cutting in standby WSH and cut out heating WSH are unified, thus a control strategy to suppress power fluctuations of equivalent load in microgrids is proposed based on demand-side reservation and WSH group response. Finally, by applying case data in an actual microgrid, the effectiveness of the control strategy is verified. This work is supported by International Science & Technology Cooperation Program of China(No. 2013DFG61520).
[1] | 王境彪,彭坚,段娟凤,等.基于需求侧预约响应的平滑微网等效负荷功率波动控制策略[J].电力系统自动化,2017,41(4):69-77. DOI:10.7500/AEPS20160425007. WANG Jingbiao, PENG Jian, DUAN Juanfeng, et al. Control Strategy for Suppressing Power Fluctuation of Equivalent Load in Microgrids Based on Demand-side Reservation and Response[J]. Automation of Electric Power Systems, 2017, 41(4):69-77. DOI:10.7500/AEPS20160425007. |