| 引用本文: | 黄怡涵,王小海,张红光,等.火电机组一次调频简化模型改进与电力系统频率安全约束解析计算[J].电力系统保护与控制,2025,53(15):36-47. |
| HUANG Yihan,WANG Xiaohai,ZHANG Hongguang,et al.Improvement of simplified primary frequency regulation model for thermal power units and analytical calculation of power system frequency security constraints[J].Power System Protection and Control,2025,53(15):36-47 |
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| 摘要: |
| 随着新型电力系统中新能源和电力电子设备占比的提高，频率安全问题成为影响系统安全稳定运行的瓶颈之一。为了满足电网侧对大规模电力系统频率响应特性解析分析的需求，首先对现有解析法所用火电机组一次调频简化模型进行改进，建立了综合考虑负荷反馈控制特性、阀位限幅特性及主汽压力稳态值影响的火电机组一次调频二阶简化模型。然后，为准确反映机组在不同运行工况下真实的调频特性，基于机组实时测量的稳态运行数据，提出了一次调频简化模型参数的在线确定方法。最后，为了实现系统频率安全约束的解析计算，对平均系统频率模型进行开环处理。将机组一次调频简化模型应用于平均系统频率开环模型中，提出了系统频率安全约束的解析计算方法。仿真结果表明，所提简化模型及频率安全解析分析方法能够对系统频率安全特性进行有效评估，且具有较高的求解精度。 |
| 关键词: 系统频率响应 一次调频 火电机组 频率安全约束 |
| DOI：10.19783/j.cnki.pspc.241331 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52207115)；内蒙古电力(集团)有限责任公司科技项目资助(发文号：内电科创〔2024〕5号) |
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| Improvement of simplified primary frequency regulation model for thermal power units and analytical calculation of power system frequency security constraints |
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HUANG Yihan1, 2, WANG Xiaohai3, ZHANG Hongguang4, CHEN Lei2, HAO Ling2, YANG Zhiguo4
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1. Suzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Suzhou 215000, China; 2. State Key
Laboratory of Power System Operation and Control (Department of Electrical Engineering, Tsinghua University),
Beijing 100084, China; 3. Inner Mongolia Power (Group) Co., Ltd., Hohhot 010090, China; 4. Branch of
Power Dispatching Control, Inner Mongolia Power (Group) Co., Ltd., Hohhot 010090, China
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| Abstract: |
| With the increasing penetration of renewable energy and power electronic devices in modern power systems, frequency security has become one of the bottlenecks affecting safe and stable power system operation. In order to meet the analytical needs from the grid-side for frequency response in large-scale power systems, the simplified model of primary frequency regulation (PFR) for thermal power units employed in the existing analytical methods is first improved. A second-order simplified model is established, which comprehensively considers the characteristics of the load feedback control, valve position limitation, and the influence of steady-state main steam pressure. Then, to accurately reflect the real PFR characteristics of units under different operating conditions, an online method for determining PFR model parameters is proposed based on real-time steady-state operating data. Finally, to enable analytical calculation of system frequency security constraints, the average system frequency model is treated as an open-loop system. By integrating the simplified PFR model into the open-loop average system frequency model, an analytical method for calculating the frequency security constraints is developed. Simulation results indicate that the proposed simplified model and analytical method for frequency security assessment can effectively evaluate the frequency security characteristics with high accuracy. |
| Key words: system frequency response primary frequency regulation thermal power unit frequency security constraint |
