摘要
电池储能可有效解决大规模海上风电并网系统存在的间歇性与随机性的缺点,起到功率波动平滑、惯量补偿和调频调峰等作用。与传统电池单体直接串并联扩容技术相比,以双向直流变换器为接口的电池模块输出串并联组合扩容方式由于可消除储能系统内部的环流、提高系统能量利用率而具有广大的应用前景。此处面向直流级联型电池储能系统,针对储能系统模块存在的输出功率与电压控制耦合问题,提出了一种基于荷电状态(SOC)均衡的储能系统协调控制策略,在直流变换器及逆变器不超额运行的前提下解决了储能系统模块间功率电压的自主协调控制、SOC均衡及故障冗余问题,实验结果证明了所提控制策略的有效性。
Battery energy storage can effectively solve the shortcomings of large-scale offshore wind power grid connection system,such as intermittency and randomness,playing a role in power fluctuation smoothing,inertia compensation and frequency and peak regulation.Compared with the traditional battery units’direct series-parallel expansion technology,the serial-parallel capacity expansion method of battery module output based on bi-directional DC converter has broad application prospects because it can eliminate the internal circulation of energy storage system and improve the energy utilization rate of the system.Oriented to DC cascade battery energy storage system,aiming at the coupling problem of output power and voltage control of energy storage system module,a coordinated control strategy of energy storage system based on state of charge(SOC)equalization is put forward,solving the problems of power and voltage coordination,balance of SOC and fault redundancy among energy storage system modules under the premise that the DC converter and inverter do not overrun.Experimental results verify the effectiveness of the proposed control strategy.
作者
马智远
徐硕
彭和平
MA Zhi-yuan;XU Shuo;PENG He-ping(Electric Power Test&Research Institue of Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510410,China)
出处
《电力电子技术》
CSCD
北大核心
2022年第10期36-39,48,共5页
Power Electronics
基金
南方电网科技项目(080037KK52200013,GZHKJXM20200050)
关键词
变换器
级联型电池储能系统
荷电状态均衡
converter
cascade battery energy storage system
state of charge equalization
