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双闭环定交流电压控制下MMC换流站阻抗建模及稳定性分析
作者:
作者单位:

1.浙江大学电气工程学院,浙江省杭州市 310027;2.直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市 510080

作者简介:

年珩(1978—),男,通信作者,博士,教授,博士生导师,主要研究方向:新能源技术、风力发电技术等。E-mail:nianheng@zju.edu.cn
朱茂玮(1996—),男,硕士研究生,主要研究方向:模块化多电平变流器建模及控制。E-mail:21710048@zju.edu.cn
徐韵扬(1994—),女,博士,主要研究方向:新能源发电系统建模与稳定分析。E-mail:xuyunyang@zju.edu.cn

通讯作者:

基金项目:

国家自然科学基金资助项目(51622706);直流输电技术国家重点实验室开放基金资助项目(SKLHVDC-2019-KF-11)。


Impedance Modeling and System Stability Analysis of MMC with Double Closed-loop AC Voltage Control
Author:
Affiliation:

1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.State Key Laboratory of HVDC (Electric Power Research Institute of China Southern Power Grid Company Limited, Guangzhou 510080, China)

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51622706) and Open Foundation of State Key Laboratory of HVDC (No. SKLHVDC-2019-KF-11).

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    摘要:

    风电系统接入基于模块化多电平换流器(MMC)的高压直流(HVDC)输电系统是极具前景的输电方案,同时也面临较为突出的系统稳定性问题。小信号阻抗分析法是研究互联系统稳定的有效办法。然而,MMC的内动态特性使得精确建立其阻抗模型具有较大难度。文中采用多谐波线性化方法建立了采用双闭环定交流电压控制的MMC送端换流站小信号阻抗模型,可实现电流环对MMC阻抗影响的准确分析。针对直驱风机通过MMC-HVDC系统并网的系统,利用阻抗分析法分别分析了MMC电流环不同控制带宽下互联系统振荡的问题,为电流环参数优化设计提供了依据。最后,基于MATLAB/Simulink的仿真结果证明了阻抗模型和稳定性分析理论的正确性。

    Abstract:

    The wind power integration via the modular multilevel converter (MMC) based high voltage DC (HVDC) transmission system is a promising scheme for power transmission, which also faces prominent stability problems. The small-signal impedance analysis method is an effective way to study the stability of interconnected systems. However, it is difficult to accurately build the impedance model of MMC due to its internal dynamic characteristics. By using the multi-harmonic linearization method, this paper develops a small-signal impedance model of the sending-terminal MMC with double closed-loop AC voltage control. Then the influence of current control loop on impedance characteristics is analyzed accurately. For the system in which the wind farms consisting of direct-driven wind generators are connected with MMC-HVDC system, the impedance analysis method is applied to analyze the oscillation of the interconnected system with different bandwidths of current control loop of MMC, which provides a basis for optimal parameter design of current control loop. The simulation results based on MATLAB/Simulink validate the correctness of the impedance model and stability analysis.

    表 4 Table 4
    表 3 Table 3
    图1 单相MMC结构图Fig.1 Structure of single-phase MMC
    图2 MMC交流侧小信号阻抗模型验证Fig.2 Validation for small-signal impedance model of MMC at AC side
    图3 MMC较大电流环带宽下风电场-MMC互联系统的阻抗特性Fig.3 Impedance characteristic of wind farm-MMC interconnected system with wide bandwidth of current control loop
    图4 MMC较小电流环带宽下风电场-MMC互联系统的阻抗特性Fig.4 Impedance characteristic of wind farm-MMC interconnected system with narrow bandwidth of current control loop
    图5 MMC电流环参数优化设计后风电场-MMC互联系统的阻抗特性Fig.5 Impedance characteristic of wind farm-MMC interconnected system with parameter optimization of current control loop
    图 小扰动下MMC内动态特性Fig. MMC internal dynamics under small disturbance
    图 MMC环流抑制控制框图Fig. Block diagram of circulating current suppressing control
    图 MMC交流相电压控制框图Fig. Block diagram of MMC phase voltage control
    图 MMC定交流电压控制传递函数框图Fig. Transfer Function Diagram of the AC Voltage Control Loop of MMC
    图 电流环附加阻抗示意图Fig. Diagram of the Additional Impedance of the Current Loop
    图 电流环带宽较大下MMC阻抗特性Fig. Impedance Characteristic of MMC with wide bandwidth of AC Current Control Loop
    图 电流环带宽较小下MMC阻抗特性Fig. Impedance Characteristic of MMC with narrow bandwidth of AC Current Control Loop
    图 改变电流控制器比例系数、积分系数下MMC的附加阻抗特性Fig. The additional impedance characteristic of MMC with different kpi and kii of AC Current Control
    图 直驱风电场-送端MMC互联系统结构图Fig. System diagram of the wind farm consisting of direct-driven wind turbine generators with MMC-HVDC transmission
    图 风电场-MMC互联系统小信号阻抗图Fig. Impedance diagram of wind power transmission with MMC-HVDC
    图 直驱风机阻抗模型验证Fig. Validation for the small signal impedance of direct-driven wind turbine generator
    图 MMC较大电流环带宽下系统振荡仿真结果Fig. Simulation result of system oscillation with wide bandwidth of current control loop
    图 MMC较小电流环带宽下系统振荡仿真结果Fig. Simulation result of system oscillation with narrow bandwidth of current control loop
    图 MMC电流环不同参数下互联系统稳定裕度Fig. Stability Margin of interconnected system with different parameters of current control loop
    图 MMC电流环参数优化设计后系统仿真结果Fig. Simulation result after parameters optimization of current control loop
    表 1 MMC内部谐波相序分类Table 1 Classification of phase sequence of internal harmonics of MMC
    表 2 MMC内部谐波共模、差模分类Table 2 Classification of common mode and differential mode of internal harmonics of MMC
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引用本文

年珩,朱茂玮,徐韵扬,等.双闭环定交流电压控制下MMC换流站阻抗建模及稳定性分析[J].电力系统自动化,2020,44(4):81-90. DOI:10.7500/AEPS20190328002.
NIAN Heng,ZHU Maowei,XU Yunyang,et al.Impedance Modeling and System Stability Analysis of MMC with Double Closed-loop AC Voltage Control[J].Automation of Electric Power Systems,2020,44(4):81-90. DOI:10.7500/AEPS20190328002.

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  • 收稿日期:2019-03-28
  • 最后修改日期:2019-09-28
  • 录用日期:2019-09-28
  • 在线发布日期: 2020-02-16
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