Risk Assessment and Defensive Control of Power Imbalance in New-type Power Systems

LIU Xiangyu; ZHANG Lihao; LI Shaoyan; GU Xueping; LI Huibin; LI Zenghui; {{custom_author.name_en}}

doi:10.13334/j.0258-8013.pcsee.250172

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Risk Assessment and Defensive Control of Power Imbalance in New-type Power Systems

更新时间：2026-10-19

- Risk Assessment and Defensive Control of Power Imbalance in New-type Power Systems
- Vol. 46, Issue 8, Pages: 3236-3249(2026)
- 作者机构：
  
  1. 1
  2. 华北电力大学电气与电子工程学院,河北省,保定市,071003
  3. 2
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.250172
  CLC：
- Received：24 March 2025，
  
  Published：2026
- 稿件说明：
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LIU Xiangyu, ZHANG Lihao, LI Shaoyan, et al. Risk Assessment and Defensive Control of Power Imbalance in New-type Power Systems[J]. 2026, 46(8): 3236-3249.
DOI：

LIU Xiangyu, ZHANG Lihao, LI Shaoyan, et al. Risk Assessment and Defensive Control of Power Imbalance in New-type Power Systems[J]. 2026, 46(8): 3236-3249. DOI： 10.13334/j.0258-8013.pcsee.250172.

摘要

为应对源荷波动和故障冲击造成的频率安全风险，提出新型电力系统功率失衡态势评估、运行方式优化控制和安全风险分级防御方法。首先，分析新型电力系统功率失衡风险的主要表现形式，基于电网频率波动相关的6个安全约束指标划定安全运行边界；其次，提出电网频率安全风险分级评估指标，并基于此建立电网安全态势评估模型；然后，考虑负荷特性、故障冲击和储能资源，以出力偏差最小为优化目标建立日前运行方式的优化调整模型；最后，计及低频减载控制，建立源荷超预期波动时电网的安全防御分级控制模型。改进IEEE39节点系统算例结果表明，提出方法可有效评估电网的功率失衡风险态势，校正电网的安全运行域，实现电网安全风险主动防御。

Abstract

To address the frequency-security risks resulting from source-load fluctuations and fault impacts

this paper proposes methods for assessing the power-imbalance situation

optimizing and controlling the operation mode

and hierarchical defense against security risks in the new-type power system. First

the main manifestations of power-imbalance risks in the new-type power system are analyzed. The safe-operation boundaries are defined based on six safety-constraint indicators related to power-grid frequency fluctuations. Next

hierarchical assessment indicators for power-grid frequency security risks are proposed

and a power-grid security-situation assessment model is established accordingly. Then

considering load characteristics

fault effects

and energy storage resources

an optimization adjustment model for the day-ahead operation mode is established with the objective of minimizing the power output deviation. Finally

considering the under frequency load shedding control

a hierarchical control model for power-grid security defense is established for scenarios where source-load fluctuations exceed expectations. The calculation results of the improved IEEE 39-bus system case demonstrate that the proposed methods can effectively evaluate the power- imbalance risk situation of the power grid

rectify the safe-operation domain of the power grid

and achieve proactive defense against power-grid security risks.

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