接入新能源大基地汇集系统的柔直换流站低电压穿越方法研究

doi:10.19595/j.cnki.1000-6753.tces.240025

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摘要

当新能源大基地经柔直送出系统的汇集线路发生故障时,柔直流换流站可能由于过流闭锁导致连接新能源全部脱网。为解决上述问题,该文在考虑新能源并网换流器控制特性的基础上,对柔性换流站低穿控制期间保留电压外环的必要性进行分析,进而提出基于分序限流与等效阻抗法的汇集系统低电压穿越方法,通过正负序分离处理外环输出的参考电流,进而转换到三相坐标系下,以实现对每相的输出电流的独立处理,解决了不对称故障暂态期间故障相电流越限的问题;同时利用等效阻抗法自适应修正外环电压的参考值,避免了内环限流环节生效后,外环控制因饱和而退出的弊端,从而防止故障稳态期间柔直换流站过流闭锁。在PSCAD中搭建了新能源基地接入柔性换流站的交流汇集系统的精细化模型,通过仿真实验验证了所提控制方法的有效性。

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	刘昊霖
	贾科
	毕天姝
	钮厚敏
	李伟涛

关键词 ：新能源大基地, 汇集系统, 低电压穿越, 等效阻抗法, 内环限流

Abstract：

When the collection line of the flexible direct current (DC) transmission system of a new energy mega-base experiences a fault, the flexible DC converter station may, due to overcurrent blocking, result in the disconnection of the entire connection to the new energy source. To address these issues, this paper, considering the control characteristics of the new energy grid-connected converter, analyzes the necessity of retaining the voltage outer loop during the low penetration control period of the flexible converter station. Subsequently, a method for low-voltage ride-through of the collection system is proposed based on sequence current limitation and equivalent impedance. This involves separating the reference currents output by the outer loop into positive and negative sequences, then transforming them into the three-phase coordinate system to achieve independent processing of the output currents for each phase, thus solving the problem of asymmetrical fault transient overcurrent of the faulted phase. Simultaneously, the paper utilizes the equivalent impedance method to adaptively adjust the reference values of the outer loop voltage, avoiding the drawback of the outer loop control exiting due to saturation after the inner loop current limiting section becomes effective. This helps prevent overcurrent blocking of the flexible DC converter station during the fault steady-state period. The authors constructed a refined model of the AC collection system for the new energy mega-base connected to the flexible converter station in PSCAD and validated the effectiveness of the proposed control method through simulation experiments.

Key words： Renewable energy base collection system low voltage ride trough equivalent impedance method inner ring current limiting

收稿日期: 2024-01-04

PACS:

TM615

基金资助:

国家重点研发计划资助项目（2022YFB4202302）

通讯作者: 贾科男,1986年生,教授,博士生导师,研究方向为新能源电力系统保护与控制、新型配电网故障定位与系统恢复控制等。

作者简介: 刘昊霖,男,1999年生,博士研究生,研究方向为新能源大基地并网系统保护与控制。E-mail: 871100549@qq.com

引用本文:

刘昊霖, 贾科, 毕天姝, 钮厚敏, 李伟涛. 接入新能源大基地汇集系统的柔直换流站低电压穿越方法研究[J]. 电工技术学报, 0, (): 240025-240025. Liu Haolin, Jia Ke, Bi Tianshu, Niu Houmin, Li Weitao. Research on Low Voltage Ridethrough Methods for Flexible DC Converter Stations Connected to the Gathering System of New Energy Base. Transactions of China Electrotechnical Society, 0, (): 240025-240025.

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