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工程科学与技术:2023,55(2):72-83
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基于风储联合系统的受端电网黑启动技术及协调恢复策略
(1.四川大学 电气工程学院,四川 成都 610065;2.国网山西省电力科学研究院,山西 太原 030002)
Receiving-end Power Grid Black Start Technology and Coordinated Restoration Strategy Based on Wind-storage Combined System
(1.School of Electrical Eng., Sichuan Univ., Chengdu 610065, China;2.State Grid Shanxi Electric Power Research Inst., Taiyuan 030002, China)
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投稿时间:2022-04-08    修订日期:2022-08-23
中文摘要: 受端电网发生故障停电时要求送端电源具备黑启动能力,目前中国具有黑启动电源的主要为火电厂及水电厂。随着高比例的风电大量接入,电网要求风电机组具有一定的黑启动能力,但风能由于其不确定性和波动性导致风电机组很难单独参与黑启动。为使得风电机组具备较好的黑启动能力参与电网恢复,本文针对双馈风电场,提出了一种基于风储联合系统的受端电网3阶段协调恢复策略。初始阶段,通过储能装置建立交流频率和电压辅助风机顺利并网;中期阶段,切换储能装置控制模式并在风机转子侧设计虚拟同步控制为系统提供频率和电压支撑,并完成部分发电机组及负荷的恢复;后期阶段,在储能侧设计了基于H2/H的附加鲁棒控制器抑制多机组并网的低频振荡,实现受端电网平稳恢复。在PSCAD/EMTDC平台搭建了风储联合系统模型,并进行黑启动和电网恢复过程仿真。结果表明:提出的风储联合启动能够实现风机顺利并网;在厂用负荷和机组并网过程中采用切换储能控制方式能维持电压和频率在稳定范围内;在受端电网恢复及后期阶段,设计的鲁棒控制器对低频振荡有很好的抑制效果;相比常规控制,在系统启动恢复过程中采用的虚拟同步控制对系统的支撑能力更强。从而验证了本文所提风储联合系统参与受端电网黑启动的协调恢复策略的有效性和可行性。
Abstract:When faults occur in the receiving-end power grid, the sending-end power supply is required to have black-start capability. At present, the existing black-start power sources in China are mainly thermal power plants and hydropower plants. With a high proportion of wind power enormously connected to the main grid, wind turbines are required to have a certain black-start capability. However, due to the uncertainty and volatility of wind energy, it is difficult for wind turbines to participate in black start alone. In order to make wind turbines have better black start ability to participate in power grid restoration, this paper proposed a three-stage coordinated recovery strategy for the receiving-end power grid based on the combined wind-storage system for doubly-fed wind farms. In the initial stage, the AC frequency and voltage were established through the energy storage device so that the wind turbine can smoothly connected to the main grid. Then, in the middle stage, the control mode of the energy storage device was switched and a virtual synchronous control was designed on the rotor side of the wind turbine to provide support of frequency and voltage for the system, and some generator sets and loads can recover. After that, in the later stage, an additional robust controller based on H2/H was designed on the energy storage side, which can suppress the low-frequency oscillation when multiple units connected to the grid, so as to realize the stable recovery of the receiving-end power grid. Finally, a wind-storage combined system model was built based on PSCAD/EMTDC and the black start and restoration of power grid restoration was simulated. The simulation results show that the proposed joint startup of both wind turbine and energy storage can realize the smooth grid connection of wind turbine; In the grid connection process of plant load and generator, switching energy storage control mode of wind turbine can maintain the voltage and frequency of in the stable range; Moreover, in the stage of recovery and later operation of receiving power grid, the designed robust controller designed has a good effect on suppressing low-frequency oscillation; Compared with the conventional control modals, the virtual synchronization control adopted in the process of system startup and recovery has a stronger ability to support the system; Thus, the effectiveness and feasibility of the proposed coordinated restoration strategy of wind and energy storage system participating in the black start of the receiving power grid are fully verified.
文章编号:202200299     中图分类号:TM722    文献标志码:
基金项目:国家电网总部科技项目(5100-202199274A-0-0-00)
作者简介:第一作者:张英敏(1974—),女,教授,博士. 研究方向:电力系统稳定与控制;高压直流输电. E-mail:zhangyingmin@scu.edu.cn;通信作者:江琴, E-mail:eejqin@scu.edu.cn
引用文本:
张英敏,吴谨轶,江琴,李保宏,苟洪霖,王腾鑫,张敏.基于风储联合系统的受端电网黑启动技术及协调恢复策略[J].工程科学与技术,2023,55(2):72-83.
ZHANG Yingmin,WU Jinyi,JIANG Qin,LI Baohong,GOU Honglin,WANG Tengxin,ZHANG Min.Receiving-end Power Grid Black Start Technology and Coordinated Restoration Strategy Based on Wind-storage Combined System[J].Advanced Engineering Sciences,2023,55(2):72-83.