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考虑功率变化速率的储能辅助单机调频控制策略
赵源筱1, 耿光超1, 江全元1, 刘文龙1, 陈义宣2, 李玲芳2
1.浙江大学 电气工程学院,浙江 杭州 310027;2.云南电网有限责任公司电网规划建设研究中心,云南 昆明 650217
摘要:
风电具有显著的波动性和不确定性,大规模风电并网给电力系统的频率调节带来了严峻的挑战。储能具有灵活爬坡特性和双向调节能力,可有效辅助常规机组参与频率调节,提高参与自动发电控制(AGC)的机组响应能力,从而提高高风电功率波动系统的频率稳定性。以机组功率调节速率能否弥补系统功率波动为判断依据,以储能的有功功率变化速率和有功功率基点作为控制变量,提出一种考虑功率变化速率的储能辅助单台火电AGC机组参与电力系统频率调节的协调控制策略,自适应决策储能的动作时机和动作速率。基于PSCAD/ETMDC平台的仿真结果表明,所提策略以储能更少的动作频度和动作深度,达到了更优的调频效果,可有效减少储能功率/能量容量配置,具有良好的经济性,为储能的多场景应用奠定了基础。
关键词:  风电并网  储能  火电机组  频率  自动发电控制  功率变化速率  辅助调频  协调控制
DOI:10.16081/j.epae.202001014
分类号:TM614;TM761
基金项目:南方电网公司科技研究项目(059100KK52170013)
Frequency control strategy of single-generator supporting by energy storage considering power change rate
ZHAO Yuanxiao1, GENG Guangchao1, JIANG Quanyuan1, LIU Wenlong1, CHEN Yixuan2, LI Lingfang2
1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Planning Research Center of Yunnan Power Grid Co.,Ltd.,Kunming 650217, China
Abstract:
Wind power has significant volatility and uncertainty, and large-scale wind power integration brings severe challenges to the frequency regulation of power system. Energy storage has the characteristics of flexible ramp and two-way adjustment capability, which can effectively assist conventional units to participate in frequency regulation and improve the response capacity of units participating in AGC(Automatic Generation Control),so as to improve the frequency stability of power system with high wind power fluctuation. Based on the judgment of whether the power adjustment speed of unit can compensate the system power fluctuation, taking the active power change rate and the active power base point of energy storage as the control variables, a coordinated control strategy for power system frequency regulation involving a single thermal AGC unit assisted by energy storage and considering the power change rate is proposed, which can determine the action time and action rate of energy storage adaptively. Simulative results based on PSCAD/ETMDC platform show that the proposed strategy achieves better frequency regulation effect with less action frequency and action depth of energy storage, can effectively reduce the energy storage power/energy capa-city configuration, has good economy and provides a basis for multi-scene application of energy storage.
Key words:  wind power integration  energy storage  thermal power unit  frequency  automatic generation control  power change rate  auxiliary frequency regulation  coordinated control

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