直流微电网中电压源型变流器故障穿越控保协同策略

doi:10.12204/j.issn.1000-7229.2023.07.008

电力建设 ›› 2023, Vol. 44 ›› Issue (7): 70-76.doi: 10.12204/j.issn.1000-7229.2023.07.008

直流微电网中电压源型变流器故障穿越控保协同策略

冯怿彬¹^,²(), 张后谊³, 谢宇哲¹^,², 周盛¹^,², 韩寅峰¹^,², 权超¹^,²

1.国网浙江省电力有限公司宁波供电公司,浙江省宁波市 315000
2.宁波市新型电力系统数字物理混合仿真重点实验室,浙江省宁波市 315000
3.贵州电网有限责任公司电力科学研究院,贵阳市 550002

收稿日期:2022-12-16 出版日期:2023-07-01 发布日期:2023-06-25
通讯作者: 冯怿彬(1990),男,硕士,工程师,主要研究方向为分布式发电与微电网仿真、运行控制技术,E-mail:fyb728@163.com
作者简介:张后谊(1995),男,硕士,工程师,主要研究方向为微电网优化调度、新能源电网建模与仿真;
谢宇哲(1984),男,硕士,高级工程师,主要从事电网规划仿真与调度运行工作;
周盛(1985),男,硕士,高级工程师,主要从事电网规划仿真与调度运行工作;
韩寅峰(1986),男,硕士,高级工程师,主要从事有源配电网保护与配电网自动化工作;
权超(1993),男,硕士,工程师,主要研究方向为氢电耦合直流微网。
基金资助:
国家重点研发计划项目(2020YFB1506800)

Control and Protection Cooperation Strategy for a Voltage Source Converter in a DC Microgrid During a Fault Ride-through

FENG Yibin¹^,²(), ZHANG Houyi³, XIE Yuzhe¹^,², ZHOU Sheng¹^,², HAN Yinfeng¹^,², QUAN Chao¹^,²

1. State Grid Ningbo Power Supply Company, Ningbo 315000, Zhejiang Province, China
2. Ningbo Key Laboratory of New Power System Digital-Physical Hybrid Emulation Lab, Ningbo 315000, Zhejiang Province, China
3. Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China

Received:2022-12-16 Online:2023-07-01 Published:2023-06-25
Supported by:
National Key Research and Development Program of China(2020YFB1506800)

摘要/Abstract

摘要：

目前,直流微电网的保护方案主要是基于传统保护思想,由于直流故障时冲击电流大、上升速度快,可供使用的数据信息极少,导致对保护装置的快速检测和开断能力要求较高,大幅增加了系统的建设运行成本。以典型直流微电网为研究对象,深入分析了AC/DC、DC/DC等电压源型变流器的故障特性,提出了一种具备直流故障穿越能力的电压源型变流器控保协同策略,通过设计通用的直流故障穿越模块,能够在故障发生时快速隔离故障,并主动输出稳定可控的短路电流,以降低保护检测难度;同时,该附加模块还能自动诊断外部故障清除情况,以快速恢复系统运行。最后通过仿真验证了所提控保协同策略的有效性。

关键词: 直流微电网, 故障穿越, 控保协同, 故障恢复

Abstract:

The current protection scheme for DC microgrids is mainly based on the traditional protection strategy. Because of the large and rapid rising impact current during a DC fault, the available data information for protection is quite rare. This has resulted in high requirements for the rapid detection and breaking capability of protection devices, which in turn considerably increases the construction and operation costs of DC microgrids. In this study, based on a typical DC microgrid, the fault characteristics of voltage source converters such as AC/DC and DC/DC are thoroughly analysed. The study then proposes a control and protection cooperation strategy for a voltage source converter in a DC microgrid during a fault ride-through (FRT). This method designs a universal DC FRT module that can realize quick fault isolation and inject a controllable short circuit current during a DC fault, which reduces the difficulty of protection detection. Simultaneously, the DC FRT module can also quickly restore system operation by automatically identifying whether the fault is rectified. Finally, a simulation model is constructed to verify the effectiveness of the proposed control and protection cooperation strategy.

Key words: DC microgrid, fault ride-through, control and protection cooperation, fault recovery

中图分类号:

TM732

冯怿彬, 张后谊, 谢宇哲, 周盛, 韩寅峰, 权超. 直流微电网中电压源型变流器故障穿越控保协同策略[J]. 电力建设, 2023, 44(7): 70-76.

FENG Yibin, ZHANG Houyi, XIE Yuzhe, ZHOU Sheng, HAN Yinfeng, QUAN Chao. Control and Protection Cooperation Strategy for a Voltage Source Converter in a DC Microgrid During a Fault Ride-through[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(7): 70-76.

图/表 11

图1 典型直流微电网系统结构

Fig.1 Configuration of DC microgrid system

图2 AC/DC变流器直流故障等效电路

Fig.2 Equivalent circuit of AC/DC converter during DC fault

图3 电容放电阶段等效电路

Fig.3 Equivalent circuit during C1 discharging

图4 电容放电阶段的故障电流、电压衰减曲线

Fig.4 Fault current and voltage attenuation curve during C1 discharging

图5 Boost型DC/DC变流器故障等效电路

Fig.5 Equivalent circuit of Boost DC/DC converter during DC fault

图6 Buck型DC/DC变流器故障等效电路

Fig.6 Equivalent circuit of Buck DC/DC converter during DC fault

图7 直流故障穿越模块拓扑结构

Fig.7 Topology of DC FRT module

图8 直流故障穿越模块控制框图

Fig.8 Control block diagram of DC FRT module

表1 直流微电网系统参数

Table 1 Parameters of DC microgrid

图9 直流故障穿越控制波形

Fig.9 Waveforms of FRT control

图10 故障恢复控制波形

Fig.10 Waveforms of fault recovery control

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直流微电网中电压源型变流器故障穿越控保协同策略

Control and Protection Cooperation Strategy for a Voltage Source Converter in a DC Microgrid During a Fault Ride-through

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