半月刊

ISSN 1000-1026

CN 32-1180/TP

+高级检索 English
特高压直流分层接入下交直流系统中长期电压稳定协调控制
作者:
作者单位:

电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061

作者简介:

谢季平(1993—),男,硕士研究生,主要研究方向:电力系统电压稳定与控制。E-mail:xiejiping@mail.sdu.edu.cn

通讯作者:

张文(1966—),女,通信作者,教授,博士生导师,主要研究方向:电力系统优化运行与控制、智能算法及其在电力系统中的应用。E-mail:zhangwen@sdu.edu.cn

基金项目:

山东省自然科学基金资助项目(ZR2018MEE038);国家重点研发计划资助项目(2017YFB0902600)。


Coordinated Control for Medium- and Long-term Voltage Stability of AC/DC Power Systems with Hierarchical Connection Mode of UHVDC System
Author:
Affiliation:

Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education

Fund Project:

This work is supported by Shandong Provincial National Science Foundation of China (No. ZR2018MEE038) and National Key R&D Program of China (No. 2017YFB0902600).

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    与传统特高压直流单层接入方式相比,分层接入方式从电网结构上改善了交流系统对多馈入直流系统的接纳能力和电压支撑能力,在潮流分布与控制上更加灵活、合理。为了充分利用分层接入直流系统快速功率调节能力,避免或减少中长期电压失稳过程中切负荷造成的经济损失,文中提出一种特高压直流分层接入下的交直流系统中长期电压稳定协调控制方法。首先,基于直流分层接入系统准稳态模型,推导了不同直流控制方式下换流母线电压对分层接入直流逆变器传输功率的灵敏度解析表达式,并建立交直流系统电压轨迹预测模型。综合考虑直流电流和高、低端逆变器熄弧角的调制,基于预测轨迹构建协调电压控制的滚动优化模型,对直流分层注入功率和交流系统各电压控制手段进行协调控制。对山东电网规划系统的仿真分析表明,所提方法能够有效协调直流传输功率在交流电网中的分配,提高了系统电压稳定性并减少了切负荷损失。

    Abstract:

    Compared with the conventional single-layer connection mode of ultra-high voltage direct current (UHVDC) system, the hierarchical connection mode improves the ability of AC system in acceptance and provides voltage support for multi-infeed UHVDC systems from the aspect of grid structure, and it makes power flow distribution and control more flexible and reasonable. In order to make full use of the fast power adjustment capability of UHVDC systems in the hierarchical connection mode, and avoid or reduce the economic loss caused by the load shedding during the medium- and long-term voltage instability process, this paper proposes a coordinated control method for AC/DC power systems with hierarchical connection mode of UHVDC systems. Firstly, based on the quasi-steady model of UHVDC system in the hierarchical connection mode, this paper deduces the analytical expressions of the sensitivities of converter bus voltages with different control modes of UHVDC systems to the inverter transmission power of UHVDC systems in hierarchical connection mode. Secondly, the voltage trajectory prediction model of AC/DC power systems is established based on the derived sensitivities. Finally, considering modulations of the DC current and the extinguishing angles of high and low ends of the inverter, a receding horizon optimization model of coordinated voltage control is constructed based on the predicted trajectory. The hierarchical DC injection power and the voltage control means of AC system are coordinately controlled. The simulation analysis of the planning system of Shandong power grid shows that the proposed method can effectively coordinate the distribution of DC transmission power in AC power grid, which enhances the system voltage stability and reduces the load shedding loss.

    图1 特高压直流分层接入输电系统Fig.1 Transmission system with hierarchical connection of UHVDC system
    图2 协调电压控制流程图Fig.2 Flow chart of coordinated voltage control
    图3 未施加控制时的电压响应曲线Fig.3 Voltage response curves without control
    图4 常规电压控制时的电压响应曲线Fig.4 Voltage response curves with conventional voltage control
    图5 分层接入直流参与控制时的电压响应曲线Fig.5 Voltage response curves with control of UHVDC system in hierarchical connection mode
    图6 协调控制前后扎青直流与交流系统无功功率交换量Fig.6 Reactive power exchange between Zalut-Qingzhou DC system and AC system without and with coordinated control
    图 山东电网主网架示意图Fig. Main grid diagram of Shandong power grid
    参考文献
    相似文献
    引证文献
引用本文

谢季平,张文,杨浩.特高压直流分层接入下交直流系统中长期电压稳定协调控制[J].电力系统自动化,2020,44(6):37-44. DOI:10.7500/AEPS20190403005.
XIE Jiping,ZHANG Wen,YANG Hao.Coordinated Control for Medium- and Long-term Voltage Stability of AC/DC Power Systems with Hierarchical Connection Mode of UHVDC System[J].Automation of Electric Power Systems,2020,44(6):37-44. DOI:10.7500/AEPS20190403005.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-04-03
  • 最后修改日期:2019-08-14
  • 录用日期:
  • 在线发布日期: 2020-03-21
  • 出版日期: