新能源接入对区域系统频率稳定的影响及机组改进控制策略
作者:
作者单位:

(1.国家电网有限公司西北分部,西安 陕西 710049;2.中国电力科学研究院有限公司,北京 100192)

作者简介:

通讯作者:

韩志勇(1980—),男,博士,主要从事电力系统安全稳定研究;E?mail:hanzhiyong@epri.sgcc.com.cn

中图分类号:

TM712

基金项目:

国家电网公司西北分部重点科教项目(SGTYHT/21?JS?223)


Impact of new energy access on regional system frequency stability and unit improvement control strategy
Author:
Affiliation:

(1.Northwest Branch of State Grid Corporation of China, Xi'an 710049, China;2.China Electric Power Research Institute, Beijing 100192, China)

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    摘要:

    针对新能源接入比迅速增大,导致区域电网频率稳定性问题日益突出这一问题,研究接入比与频率稳定性的关系,并提出水电、火电主导调频的改进控制策略。分析发现,随着接入比的增大,区域电网的等值惯量变小,等值功-频调节能力降低,导致水电主导区域电网的静态、动态和暂态频率稳定性都降低,以及火电主导区域电网的静态、暂态频率稳定性降低,而动态频率稳定性基本不变。通过减小调差系数,在频率反馈通道附加微分环节,改善水电主导调频的全过程频率稳定性;在频率反馈通道附加比例微分环节,改善火电主导调频的全过程频率稳定性。仿真结果表明,影响原因分析合理,改进控制策略有效,对改善大比例新能源接入系统的频率稳定性具有重要参考价值。

    Abstract:

    The new energy access ratio has rapidly increased in recent years, leading to increasingly prominent frequency stability issues in regional power grids. Therefore, this article studies the relationship between access ratio and frequency stability and proposes an improved control strategy for hydropower and thermal power-dominated frequency regulation. The analysis shows that as the access ratio increases, the equivalent inertia of the regional power grid decreases, and the equivalent power-frequency regulation ability decreases, resulting in a decrease in the static, dynamic, and transient frequency stability of the hydroelectric-dominated regional power grid; This leads to a decrease in the static and transient frequency stability of the power grid in the thermal power-dominated area, while the dynamic frequency stability remains unchanged. By reducing the adjustment coefficient and adding differential links to the frequency feedback channel, the overall frequency stability of hydropower-led frequency regulation is improved. Adding a proportional differential link to the frequency feedback channel improves the overall frequency stability of thermal power-led frequency modulation. The simulation results indicate that the analysis of the influencing factors is reasonable and that the improved control strategy is effective. This study has significant reference value for improving the frequency stability of large-scale new energy access systems.

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程 林,王吉利,韩志勇,等.新能源接入对区域系统频率稳定的影响及机组改进控制策略[J].电力科学与技术学报,2024,39(2):28-34.
CHENG Lin, WANG Jili, HAN Zhiyong, et al. Impact of new energy access on regional system frequency stability and unit improvement control strategy[J]. Journal of Electric Power Science and Technology,2024,39(2):28-34.

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  • 在线发布日期: 2024-05-29
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