可平抑高渗透分布式光伏发电功率波动的储能电站调度策略  

Dispatch Strategy of Energy Storage Station to Smooth Power Fluctuations of High Penetration Photovoltaic Generation

作　　者：刘皓明[1] 陆丹[1] 杨波[2] 姚艳[1] 叶季蕾[2] 薛金花[2] 

机构地区：[1]河海大学可再生能源发电技术教育部工程研究中心,南京210098 [2]中国电力科学研究院,南京210003

出　　处：《高电压技术》2015年第10期3213-3223,共11页High Voltage Engineering

基　　金：国家自然科学基金(51207044)~~

摘　　要：为了提高分布式光伏发电在配电网中的渗透率,需要解决其并网引起的功率波动问题。提出一种消纳高渗透分布式光伏发电有功功率波动的集中式储能电站实时调度方法,包括配电系统实时调度和储能电站站内功率分配双层结构。实时调度层通过不断更新分布式光伏发电输出功率和负荷需求的预测值,计及储能电站充放电功率、容量和次数约束,对集中式储能电站进行实时调度,以消纳配电网有功功率差额波动;功率分配层根据储能电站各电池组性能参数和运行工况,以储能电站总运行成本最小为目标,并充分考虑下一时段可调度的总充放电容量,对上层调度指令进行实时优化分配,保证储能电站积极地响应调度。算例仿真结果表明,所提的两层调度方案平抑了配电网的有功功率波动,使得联络线功率波动峰谷差由13 MW降低到5 MW左右,降低了光伏发电并网对电网的冲击,大大提高了电网对光伏发电的消纳能力,并在保证储能电站调度末期荷电量尽量接近于调度初期荷电量的同时,优化了储能电站的运行状态,降低了储能电站的运行成本,既满足了储能电站循环调度的要求,又提高了储能电站的经济性。In order to improve the penetration of distributed photovoltaic generation in distribution network, the issue of power fluctuations needs to be solved. In this paper, a real-time dispatch strategy for centralized energy storage station （CESS） was used to smooth power fluctuations of high penetration photovoltaic generation. A double-layer structure of control strategy was designed, including the real-time dispatch method of CESS in the distribution system and the power allocation method among all the energy storage devices in CESS. The dispatch layer would update the output power of distributed photovoltaic generation and the predictive values of load demand constantly to dispatch the energy storage sta- tion real-timely and to accommodate the power balance fluctuations of the distribution system, considering the constraints of charge and discharge power, capacity and cycles. The power allocation layer would proceed real-time optimization al- location following the dispatch instructions with the minimum cost of CESS as its objective, based on the performance parameters and operation parameters of each battery package. And the power allocation layer would fully consider the to- tal rest charge and discharge capacity that could be dispatched in the next period. The simulation results of example cases show that the proposed double-layer dispatch strategy can not only smooth the power fluctuations, reduce the peak-valley difference of injection power from 13 MW to about 5 MW, increase the photovoltaic power accommodation capability, and mitigate the influence of grid connected photovoltaic power station on power grid, but also optimize the operating condition and reduce the total operating costs of CESS, while maintaining the initial and final SOCs of the CESS ap- proximately equal during one day. Thus, the proposed strategy not only meets the cyclic dispatch requirements of the CESS, but also improves the economy of the CESS.

关 键 词：储能电站 分布式光伏 功率波动 消纳 实时调度 调度指令分配 

分 类 号：TM615[电气工程—电力系统及自动化]