一种送端电网单回直流极限承载能力评估方法

doi:10.12204/j.issn.1000-7229.2021.11.009

电力建设 ›› 2021, Vol. 42 ›› Issue (11): 82-89.doi: 10.12204/j.issn.1000-7229.2021.11.009

一种送端电网单回直流极限承载能力评估方法

王云玲¹, 李婷¹, 杨伟峰²(), 胥威汀¹, 苟竞¹, 刘方¹, 文云峰²

1.国网四川省电力公司经济技术研究院,成都市 610041
2.湖南大学电气与信息工程学院,长沙市 410082

收稿日期:2021-01-22 出版日期:2021-11-01 发布日期:2021-11-02
作者简介:王云玲(1979),男,硕士,高级工程师,主要研究方向为电力系统规划;
李婷(1979),女,学士,高级工程师,主要研究方向为电力系统规划;
杨伟峰(1996),男,硕士研究生,主要研究方向为换流器高占比电力系统稳定性分析与控制,Email: weifengyang@hnu.edu.cn;
胥威汀(1985),男,博士,高级工程师,主要研究方向为电力系统规划;
苟竞(1988),男,博士,高级工程师,主要研究方向为电力系统规划和新能源并网设计;
刘方(1992),男,博士,高级工程师,主要研究方向为电网规划;
文云峰(1986),男,博士,副教授,主要研究方向为低惯性电力系统规划、运行与控制。
基金资助:
国家自然科学基金项目(52077066);国家电网有限公司科技项目(SGSCJY00GHJS2000016)

An Evaluation Method of Single-Circuit HVDC Ultimate Feed-out Capacity of Sending-End Grid

WANG Yunling¹, LI Ting¹, YANG Weifeng²(), XU Weiting¹, GOU Jing¹, LIU Fang¹, WEN Yunfeng²

1. State Grid Sichuan Economic Research Institute, State Grid Sichuan Electric Power Company, Chengdu 610041, China
2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Received:2021-01-22 Online:2021-11-01 Published:2021-11-02
Supported by:
National Natural Science Foundation of China(52077066);State Grid Corporation of China Research Program(SGSCJY00GHJS2000016)

摘要/Abstract

摘要：

大容量特高压直流输电技术为送端电网清洁电能的远距离跨区消纳提供了有效手段,但随着直流馈出数量和容量的增加,“强直弱交”矛盾凸显,直流闭锁故障后的频率稳定问题会对送端电网造成较大威胁,制约送端电网直流馈出能力的进一步提升。为有效量化送端电网直流极限馈出能力、辅助评判目标网架适应性,提出了一种计及频率稳定约束的单回直流极限馈出能力评估方法。首先,对大容量直流双极闭锁场景下送端电网的频率稳定特性进行分析,构建暂态频率指标与直流闭锁量之间的解析表达式。进而,协同考虑稳控切机和直流紧急功率支援等电网第二道防线紧急控制措施,评估频率稳定约束下送端电网可承载的单回直流极限馈出容量。最后,基于四川省电网2030年规划系统进行算例分析,结合BPA软件仿真验证所提方法的有效性。

关键词: 直流馈出能力, 频率稳定, 送端电网, 直流紧急功率支援, 稳控切机

Abstract:

Large capacity UHVDC technology provides an effective means for long-distance and cross-regional power consumption of the sending-end power grid. However, with the increase of the number and capacity of HVDC, the contradiction of strong DC and weak AC is prominent. The fault of HVDC blocking will lead to an increasing threat to the frequency stability of the sending-end power grid, so the capacity of the HVDC is limited. In order to effectively quantify the extreme feed-out capacity of a single-circuit HVDC for providing references to evaluate the adaptability of the target grid, this paper proposes a method for single-circuit HVDC extreme feed-out capacity evaluation considering the frequency constraints. The proposed method firstly analyzes the frequency stability of the sending-end power grid under the scenario of large capacity HVDC bipolar lockout, and establishes the analytical expression between the transient frequency index and the capacity of HVDC lockout. Then, the second defensive line of power grid emergency control measures, such as the stability-control generator tripping and HVDC emergency active power support, are considered into the evaluation method, which can evaluate the extreme feed-out capacity of single-circuit HVDC that can be supported by the sending-end power grid under frequency stability constraints. Finally, an example simulation analysis is carried out on Sichuan Power Grid in 2030 to verify the effectiveness of the proposed method.

Key words: HVDC feed-out capacity, frequency stability, sending-end grid, HVDC emergency support, special unit tripping

中图分类号:

TM71

王云玲, 李婷, 杨伟峰, 胥威汀, 苟竞, 刘方, 文云峰. 一种送端电网单回直流极限承载能力评估方法[J]. 电力建设, 2021, 42(11): 82-89.

WANG Yunling, LI Ting, YANG Weifeng, XU Weiting, GOU Jing, LIU Fang, WEN Yunfeng. An Evaluation Method of Single-Circuit HVDC Ultimate Feed-out Capacity of Sending-End Grid[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(11): 82-89.

图/表 10

图1 系统一次调频过程

Fig.1 Primary frequency progress of power system

表1 四川电网2030年丰大测试系统直流运行状况

Table 1 HVDC operating status in Sichuan power grid in 2030 in the mode with high proportion hydropower and large load

图2 四川电网2030年地理图

Fig.2 Geography map of Sichuan power grid in 2030

图3 8 000 MW白浙直流双极闭锁下频率曲线

Fig.3 Frequency curve following the 8 000 MW Sichuan-Zhejiang HVDC bipolar block

图4 频率偏差与白浙直流承载能力关系曲线

Fig.4 Relationship between the frequency deviation and Bai-Zhe HVDC capacity

图5 不同功率设定值时白浙直流双极闭锁后系统频率曲线

Fig.5 Frequency curves following Bai-Zhe HVDC bipolar block with different power capacities

表2 不同功率设定值时白浙直流双极闭锁后系统频率极值

Table 2 Frequency extreme following Bai-Zhe HVDC bipole block with different power capacities

图6 基于稳控切机和直流紧急功率支持下的白浙直流双极闭锁频率曲线

Fig.6 Frequency curve with Bai-Zhe HVDC bipolar block with HVDC emergency support and special unit tripping

表3 基于稳控切机与直流紧急功率支援的白浙直流双极闭锁容量及对应暂态频率极值

Table 3 Bai-Zhe HVDC bipolar block capacity and its transient frequency extremum with the HVDC emergency support and special unit tripping

图7 直流参与紧急功率支援动作时的外送功率

Fig.7 The output power in the scene of the HVDC emergency support

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一种送端电网单回直流极限承载能力评估方法

An Evaluation Method of Single-Circuit HVDC Ultimate Feed-out Capacity of Sending-End Grid

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