电工技术学报  2023, Vol. 38 Issue (23): 6292-6304    DOI: 10.19595/j.cnki.1000-6753.tces.L10036
电力系统与综合能源 |
提升双馈变速抽水蓄能机组频率响应特性的控制策略
庄凯勋1, 孙建军1, 丁理杰2, 栾一航1, 张远志1
1.武汉大学电气与自动化学院 武汉 430072;
2.国网四川省电力公司电力科学研究院 成都 610041
A Control Strategy with Improved Frequency Response Characteristics of Variable Speed DFIM Pumped Storage
Chuang Kaihsun1, Sun Jianjun1, Ding Lijie2, Luan Yihang1, Zhang Yuanzhi1
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China;
2. State Grid Sichuan Electric Power Research Institute Chengdu 610041 China
全文: PDF (1993 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 采用双馈电机(DFIM)的可变速抽水蓄能机组具备出色的全工况调速性能和综合效率,是未来电网调峰调频的一种重要手段。然而,传统的频率控制方法通常将电网频率偏差整定为有功功率修正量,导致该环节与电机固有转速控制环节的控制目标相异,进而使得变速抽蓄机组无法充分发挥其动态调频特性。鉴于此,该文提出一种基于附加转速修正量的频率响应特性优化控制策略。首先,采用转速优先控制作为基本控制策略,以发挥机组可快速调速的优势。然后,引入频率响应环节,通过电网频率偏差及其变化率得到转速修正量,并限制机组转速的修正范围。同时,为更加合理地调控转子动能,结合电网频率波动过程中的特点,对频率响应环节的参数进行动态调整。通过与同容量同步电机的对比研究发现,在该文控制策略下,DFIM转子动能具有更大的调整范围。在系统投切负载仿真中,该策略与现有频率-有功控制策略相比,不仅减小了频率的变化幅度及稳态误差,而且抑制了过渡过程中的频率波动。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
庄凯勋
孙建军
丁理杰
栾一航
张远志
关键词 双馈电机可变速抽水蓄能机组惯量支撑频率响应转速控制    
Abstract:With the gradual integration of renewable energy into the power grid, the demand for flexible regulation methods is increasing. To solve this problem, the variable speed pumped storage power station adopts a doubly fed induction machine (DFIM) and a variable speed pump turbine as its main components to achieve adjustable speed and open water diversion gates, thus realizing flexible power regulation under any conditions. However, research on the frequency response characteristics of DFIM in pumped storage is still in the preliminary stage. The commonly used frequency control methods focus on converting grid frequency deviation into active power correction, leading to suboptimal frequency response characteristics. Therefore, this paper proposes a method of frequency response strategy and dynamic adjustment of control parameters, aiming at enhancing the frequency response characteristics of DFIM, and making it more effective in integrating renewable energy into the power grid.
Firstly, a topology of variable speed pumped storage unit is introduced. The speed priority control strategy and its advantages are further discussed to improve overall efficiency. Then, a frequency response module is proposed to convert frequency deviation and its rate of change into speed correction added to the speed controller. Meanwhile, a dynamic adjustment method of controller parameters, determined by the frequency characteristic during deviation, is proposed, resulting in a more reasonable release or obtainment of rotor kinetic energy. Subsequently, DFIM and synchronous machines with the same capacity are compared. The results show that DFIM can release or absorb more kinetic energy than synchronous machines, making it a crucial means to provide short-term power and inertia support to the grid.
This paper conducts two simulations using Matlab/Simulink. The first one is about rotor speed and reactive power regulation, also known as the speed priority control of the DFIM. The second one is to verify the effectiveness of the proposed frequency response strategy. The first simulation results show that the machine can accurately adjust its rotor speed, torque, and reactive power when the reference values change. Due to the reference value being changed in the form of a step function, there is an overshoot in a short period, which must be avoided when used in an actual machine. Then, the proposed frequency response strategy is simulated. This strategy is compared to a commonly used frequency-active power control strategy and a constant-speed control strategy. At the beginning of the simulation, a load was added. The results show that DFIM can lower its speed to release kinetic energy, provide short-term active power, and provide inertia support. When the load is disconnected from the power grid, the power grid frequency increases, and DFIM accelerates, converting the extra active power into rotor kinetic energy. The proposed parameter dynamic adjustment method adjusts the parameters based on the rate of frequency change, shortening the frequency and speed recovery time.
Based on theoretical analysis and simulation results, the following conclusions can be drawn: (1) When there is no frequency disturbance, the speed priority control can effectively control the motor speed, torque, and reactive power of DFIM. (2) The proposed frequency response module converts frequency deviation into speed correction, which can directly release or absorb the rotor kinetic energy. Compared with the frequency-active power control strategy, the strategy reduces frequency variation and steady-state error, and suppresses fluctuations during frequency variation. The frequency response characteristics in both generating and pumping modes are improved. (3) The parameter adjustment method allows the controller parameters to be dynamically adjusted, which can release or absorb the rotor kinetic energy more reasonably during the process. By setting the controller parameters appropriately, the inertia support capability of DFIM can be improved. This method requires little computing capability and can be handily promoted in practical engineering applications.
Key wordsDoubly fed induction machine    variable speed pumped storage unit    inertia support    frequency response    speed regulation   
收稿日期: 2023-01-13     
PACS: TM343  
基金资助:国家电网公司总部科技项目资助(SGSCDK00XTJS2200250)
通讯作者: 孙建军 男,1975年生,教授,博士生导师,研究方向为大功率电力电子拓扑分析与控制、电机设计与控制、智能电网规划与运行。E-mail:jjsun@whu.edu.cn   
作者简介: 庄凯勋 男,2000年生,硕士研究生,研究方向为电力电子设备接入电力系统。E-mail:rex_zhuang023@163.com
引用本文:   
庄凯勋, 孙建军, 丁理杰, 栾一航, 张远志. 提升双馈变速抽水蓄能机组频率响应特性的控制策略[J]. 电工技术学报, 2023, 38(23): 6292-6304. Chuang Kaihsun, Sun Jianjun, Ding Lijie, Luan Yihang, Zhang Yuanzhi. A Control Strategy with Improved Frequency Response Characteristics of Variable Speed DFIM Pumped Storage. Transactions of China Electrotechnical Society, 2023, 38(23): 6292-6304.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.L10036          https://dgjsxb.ces-transaction.com/CN/Y2023/V38/I23/6292