| 引用本文: | 霍启迪,唐晓骏,马世英,刘英培,田仕杰,梁海平.不对称短路故障下电池储能影响交流系统短路电流机理及算法[J].电力自动化设备,2022,42(3): |
| HUO Qidi,TANG Xiaojun,MA Shiying,LIU Yingpei,TIAN Shijie,LIANG Haiping.Mechanism and algorithm of short circuit current in AC system affected by BESS under asymmetric short circuit faults[J].Electric Power Automation Equipment,2022,42(3): |
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| 摘要: |
| 电池储能系统(BESS)在国内外电力系统中已得到快速发展和广泛应用，但对BESS影响短路电流机理认识尚不深入，且现有短路电流计算标准均未涉及交流系统发生不对称短路故障时考虑BESS影响的短路电流计算方法。基于BESS电磁暂态模型，分析不对称短路故障下BESS电压源换流器(VSC)外环控制器控制方式、VSC外环控制器限幅策略、BESS额定容量及故障前输送功率、BESS低电压穿越策略、电池过放保护策略等因素对BESS输出电流的影响机理。在此基础上研究不对称短路故障及不同限幅策略下BESS影响交流系统短路电流的机理，研究结果发现BESS输出无功电流越大，其提供短路电流分量与交流系统提供短路电流分量相位差越小，BESS对短路电流助增影响越大。最后提出适用于不对称短路故障下考虑BESS影响的交流系统短路电流迭代算法，并与工程上常用算法进行横向对比，验证所提算法的有效性与优越性。研究成果能为精确评估交流系统短路电流水平、合理设置BESS控制保护参数提供参考。 |
| 关键词: 电池储能系统 不对称短路故障 短路电流 影响因素 迭代算法 |
| DOI：10.16081/j.epae.202112029 |
| 分类号:TM713 |
| 基金项目:中国电力科学研究院有限公司科技项目(XT83-20-005) |
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| Mechanism and algorithm of short circuit current in AC system affected by BESS under asymmetric short circuit faults |
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HUO Qidi1, TANG Xiaojun1, MA Shiying1, LIU Yingpei2, TIAN Shijie2, LIANG Haiping2
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1.State Key Laboratory of Grid Security and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China;2.School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| BESS(Battery Energy Storage System) has been rapidly developed and widely used in domestic and foreign power grids. However, there is no in-depth study on the mechanism of short circuit current affected by BESS, and the existing short circuit current calculation standards do not involve calculation method of short circuit current in AC system considering the influence of BESS under asymmetric short circuit faults. Based on the electromagnetic transient model of BESS, the influence mechanism on the output current of BESS under asymmetric short circuit faults is analyzed, such as control mode of outer loop controller of VSC(Voltage Source Converter) of BESS, limiting strategy of outer loop controller of VSC, rated capacity and transmission power of BESS before fault occurs, LVRT(Low-Voltage Ride-Through) strategy of BESS and over-discharge protection strategy of battery. On this basis, the mechanism of short circuit current affected by BESS under asymmetric short circuit faults and different limiting strategies is studied. The study results show that with the increasing reactive power output current of BESS, the phase difference between the short circuit current component provided by BESS and the short circuit current component provided by AC system is smaller, moreover the influence of short circuit current contributed by BESS is stronger. Finally, the iteration algorithm of short circuit current in AC system affected by BESS under asymmetric short circuit faults is proposed. Compared with several common algorithms, the effectiveness and superiority of the proposed algorithm are verified. The research results can provide reference for accurate evaluation of short circuit current level in AC system and reasonable setting of control and protection parameters of BESS. |
| Key words: BESS asymmetric short circuit fault short circuit currents influence factor iteration algorithm |
