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1.东北电力大学电气工程学院,吉林省吉林市 132012
2.国网电力科学研究院有限公司(南瑞集团有限公司),江苏省南京市 211106
Received:18 September 2024,
Revised:2025-05-09,
Online First:15 September 2025,
Published:10 December 2025
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吕亚洲,姜涛,张铭恒等.考虑短时惯量波动的集中式频率校正前置控制方案[J].电力系统自动化,2025,49(23):149-161.
LYU Yazhou,JIANG Tao,ZHANG Mingheng,et al.Centralized Preemptive Frequency Correction Control Scheme Considering Short-time Inertia Fluctuations[J].Automation of Electric Power Systems,2025,49(23):149-161.
吕亚洲,姜涛,张铭恒等.考虑短时惯量波动的集中式频率校正前置控制方案[J].电力系统自动化,2025,49(23):149-161. DOI: 10.7500/AEPS20240918004.
LYU Yazhou,JIANG Tao,ZHANG Mingheng,et al.Centralized Preemptive Frequency Correction Control Scheme Considering Short-time Inertia Fluctuations[J].Automation of Electric Power Systems,2025,49(23):149-161. DOI: 10.7500/AEPS20240918004.
在大规模新能源低电压穿越和脱网场景下,电力系统频率响应轨迹呈现变化率大、跌落深但恢复慢的特点,传统基于事件触发的频率紧急控制在该场景下难以适用,以低频减载为代表的频率校正控制动作时间滞后且控制代价极大。同时,新能源短时出力变化造成的惯量波动对频率稳定控制的影响也不容忽视。为此,提出了一种考虑系统短时惯量波动的集中式频率校正前置控制方案。该方案采用“初步能量估计、二次精确校核”的决策方式,在对决策周期内系统惯量波动上下限预测的基础上,从能量及功率平衡的角度给出了频率安全边界约束下频率校正前置控制策略制定方法。在触发动作时,采用事件和轨迹联合触发机制,当预想事故发生后且频率轨迹满足触发条件时才启动控制,在避免误动的同时降低了控制代价。基于某实际电网验证了所提方案的有效性和实用性。
In the scenarios of low voltage ride-through (LVRT) and grid disconnection of large-scale renewable energy
the frequency response trajectories of power systems exhibit the characteristics of high rate-of-change
deep nadir
and slow recovery. The traditional frequency emergency control based on event triggering is difficult to apply in such scenarios
while frequency correction control represented by under-frequency load shedding (UFLS) control has delayed action time and extreme high operation costs. Meanwhile
the impact of inertia fluctuations caused by short-time renewable power variations on frequency stability control cannot be overlooked. A centralized preemptive frequency correction control scheme considering short-time inertia fluctuations of systems is proposed. Adopting a decision-making approach of “preliminary energy estimation followed by secondary precise verification”
a method for formulating the preemptive frequency correction control strategy under frequency security boundary constraints is given from the perspective of energy and power balance
based on the prediction of upper and lower limits of system inertia fluctuations during decision cycles. When action is triggered
a combined event-trajectory triggering mode is adopted. The control is initiated only when the expected fault occurs and the frequency trajectory meets the triggering conditions
thereby avoiding the misoperation and reducing the control costs at the same time. The effectiveness and practicality of the proposed scheme is verified based on an actual power grid.
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