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基于虚拟阻尼指标的柔性直流电网小信号稳定性分析
作者:
作者单位:

1.新能源电力系统国家重点实验室(华北电力大学),北京市 102206;2.四川大学电气工程学院,四川省成都市610064

作者简介:

付强(1993—),男,博士研究生,主要研究方向:新能源电力系统分析与控制。E-mail:1197348393@qq.com
杜文娟(1979—),女,通信作者,教授,主要研究方向:电力系统稳定性分析与控制。E-mail:ddwenjuan@qq.com
王海风(1960—),男,教授,博士生导师,主要研究方向:电力系统稳定性分析与控制。E-mail:hfwang60@qq.com

通讯作者:

杜文娟(1979—),女,通信作者,教授,主要研究方向:电力系统稳定性分析与控制。E-mail:ddwenjuan@qq.com

基金项目:

国家重点研发计划资助项目(2016YFB0900602);国家电网公司科技项目(52094017000W)。


Analysis of Small-signal Stability for Flexible DC Grid Based on Virtual Damping Index
Author:
Affiliation:

1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China;2.College of Electrical Engineering, Sichuan University, Chengdu 610064, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2016YFB0900602) and State Grid Corporation of China (No. 52094017000W).

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    摘要:

    近年来柔性直流电网得到了广泛关注和快速发展,柔性直流电网的稳定是保证交直流混联电力系统正常运行的重要前提。文中针对柔性直流电网,首先建立了不同控制方法下电压源型换流站和柔性直流电网的线性化模型,构建了以柔性直流电网中直流电压振荡模式为分析目标的柔性直流电网线性化互联模型。基于此,提出了一种物理意义更加明确的虚拟阻尼分析法,并对其概念和原理进行了介绍。然后,提出了能够评估电压源型换流站控制对柔性直流电网稳定性影响大小的虚拟阻尼指标,定量刻画了不同控制方法下电压源型换流站对柔性直流电网中直流电压振荡模式的影响。进一步,基于该虚拟阻尼指标,提出了适用于柔性直流电网中换流站控制参数的协调优化方法,提升了直流电网的小信号稳定性。最后,以一个三端柔性直流电网为例,详细展示了电压源型换流站虚拟阻尼的计算方法,并在包含下垂控制的复杂十端柔性直流电网中验证了多换流站参数优化方法的有效性及其相比于传统参数优化方法的优势。

    Abstract:

    In recent years, flexible DC grid attracts a lot of attentions and develops fast, whose stability is the important premise to make the hybrid AC/DC power system operate normally. Aiming at the flexible DC grid, the linearized model of voltage source converter (VSC) station and the flexible DC grid with different control methods is established, and the interaction model of flexible DC grid is established, which takes oscillation mode of DC voltage in the flexible DC grid as analysis target. Based on this, a virtual damping analysis method with more clear physical meaning is proposed, and its concept and principle are introduced. Then, virtual damping index which can evaluate the influence of VSC station control on the stability of flexible DC grid is proposed, and the impact of VSC on the oscillation mode of DC voltage with different control methods is quantitatively analyzed. Furthermore, based on the virtual damping index, a coordinated optimization method for the control parameters of VSC stations in flexible DC grid is proposed, which improves the small-signal stability of the DC grid. Finally, taking a three-terminal flexible DC grid as an example, the calculation method of virtual damping in VSC stations is presented in detail. And the effectiveness of parameter optimization method in multiple VSC stations and the advantages of the method compared with the traditional parameter optimization method is verified in the complex ten-terminal flexible DC grid with droop control.

    表 3 不同电压源型换流站和直流网络为二阶振荡环节提供的虚拟阻尼(控制调整参数后)Table 3 Virtual damping supplied to two-order oscillation loop from different voltage source converter stations and DC network (after controlling adjustment parameters)
    表 9 Table 9
    表 6 Table 6
    表 8 Table 8
    表 5 不同电压源型换流站退出后振荡模式的变化情况Table 5 Changing situation of oscillation modes when different voltage source converter stations are quit
    图1 N端柔性直流电网Fig.1 N-terminal flexible DC grid
    图2 VSCj的控制框图Fig.2 Control diagram of VSCj
    图3 虚拟阻尼指标用于优化控制参数的流程图Fig.3 Flow chart of control parameter optimizationbased on virtual damping index
    图4 复杂十端柔性直流电网Fig.4 Ten-terminal complex flexible DC grid
    图5 2种不同调节方法下柔性直流电网的仿真结果Fig.5 Simulation results of flexible DC grid with two different tuning methods of parameters
    图 三端柔性直流电网Fig. Three terminal flexible DC grid
    表 7 Table 7
    表 4 振荡模式实部对kp,dc,i的灵敏度及调节结果Table 4 Sensitivity of real part of oscillation mode to kp,dc,i and adjustment results
    表 1 不同电压源型换流站参数变化对振荡模式的影响Table 1 Impact of parameters of different volatge source converter stations on oscillation mode
    表 2 不同电压源型换流站和直流网络为二阶振荡环节提供的虚拟阻尼(控制调整参数前)Table 2 Virtual damping supplied to two-order oscillation loop from different volatge source converter stations and DC network (before controlling adjustment parameters)
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引用本文

付强,杜文娟,王海风.基于虚拟阻尼指标的柔性直流电网小信号稳定性分析[J].电力系统自动化,2020,44(11):111-120. DOI:10.7500/AEPS20190705004.
FU Qiang,DU Wenjuan,WANG Haifeng.Analysis of Small-signal Stability for Flexible DC Grid Based on Virtual Damping Index[J].Automation of Electric Power Systems,2020,44(11):111-120. DOI:10.7500/AEPS20190705004.

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  • 收稿日期:2019-07-05
  • 最后修改日期:2019-12-09
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  • 在线发布日期: 2020-05-28
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