兼具电池储能与无功补偿的高压直挂大容量系统四象限运行控制技术
Four Quadrants Operation Control of High-voltage Transformerless Large-capacity System Integrating Battery Energy Storage and Reactive Power Compensation
吴西奇 1刘畅 1李睿 1姜新宇 2余东旭 3陆承宇 4裘鹏 4丁超 4蔡旭1
作者信息
- 1. 电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 闵行区 200240
- 2. 广州智光储能科技有限公司,广东省 广州市 510765
- 3. 宁德时代新能源科技股份有限公司,福建省 宁德市 352106
- 4. 国网浙江省电力有限公司电力科学研究院,浙江省 杭州市 310000
- 折叠
摘要
高压直挂电池储能系统(battery energy storage system,BESS)采用H桥电路串联的方法升高电压后接入电网,将电池簇分散接入级联 H 桥变换器的直流侧,具有高度模块化的结构,对比低压方案具有单机容量大、效率高、响应速度快等明显优势.高压直挂BESS若能兼具无功补偿能力,实现系统四象限运行,将具有更大的成本优势和经济效益.电池簇接单相 H 桥变换器的结构,使得系统运行在高比例无功补偿工况时,电池簇电流在一个二倍基频的周期中会出现两次反向,导致电池运行在高频充放电的工况,这会对电池寿命和电池状态监测造成较大的影响.为解决这一问题,提出一种基于零序电压注入的高比例无功补偿控制方法,避免了二倍基频脉动电流对电池进行高频充放电,再通过优化零序电压的幅值和相位,最大程度上降低对电池的影响.
Abstract
The high-voltage transformer-less battery energy storage system(BESS)adopts the concept of cascading H-bridge circuits to connect the high voltage power grid.A large number of battery cells are separated equally into numerous clusters at the DC side of H-bridge submodules,and a high degree of modularity features the BESS.Compared with the low-voltage solution,it has obvious advantages such as larger capacity of single-machine,higher efficiency,and faster response speed.If the high-voltage transformer-less BESS also has reactive power compensation capabilities and can realize the four-quadrant operation of the system,greater cost advantages and economic benefits will be obtained.When the system operates at a high proportion of reactive power compensation,the structure of the battery cluster connected to the single-phase H-bridge converter results in that the battery current will reverse in a cycle of twice the fundamental frequency.The battery is charged and discharged with high frequency,which will have a great impact on battery life and battery status monitoring.To solve this problem,this paper proposes a high-proportion reactive power compensation control based on zero-sequence voltage injection and the charged and discharged current with twice the fundamental frequency is removed.Besides,the amplitude and phase of the zero-sequence voltage are optimized to minimize the impact on the battery.
关键词
高压直挂/电池储能/无功补偿/零序电压/功率因素/四象限Key words
high-voltage transformer-less/battery energy/reactive power compensation/zero-sequence voltage/power factor/four quadrants引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据