面向韧性提升的虚拟振荡器并网运行控制方法
Resilience-enhancing
Control Method for Grid-connected Virtual Oscillator
史亚帆，许寅，吴翔宇
北京交通大学电气工程学院，北京100044
摘要(Abstract)：
电力电子逆变器的稳态特性与暂态稳定能力极大程度由其控制方式决定。具有大扰动稳定性与快速响应能力的 逆变器控制方法能够有效保障极端场景下逆变器的稳定功率输出，降低由故障引起的功率缺额，从而提升电网的韧性。 虚拟振荡器控制（virtual oscillator control，VOC）是近年来新兴的构网型控制方法，相对于基于下垂的构网型控制策略具有 响应速度更快、大扰动稳定性能更强等优势，但在并网运行时输出功率存在无法跟随参考值的问题，这是目前限制其工 程应用的关键问题之一。文中基于庞加莱分岔方程，设计了庞加莱型虚拟振荡控制器，并给出了控制参数的设计方案； 然后，基于潮流方程，实时计算满足潮流可行解的电压幅值，以此作为电压参考来实时更新控制器的输入，考虑系统全局 参数难以获取的情况，设计积分控制率来对稳态误差进行补偿，使逆变器在并网运行时有功功率与无功功率均可跟随参 考值；最后，基于MATLAB/Simulink软件，通过仿真算例验证了所提控制方法的有效性。The steady-state
characteristics and transient stability of power electronic inverter are
largely determined by its control methods.Inverter
control methods with strong disturbance stability and fast response capability
can effectively ensure the stable power output of inverters in fault scenarios，reducing
power shortages caused by faults，and thus improve the
resilience of the power grid. Virtual oscillator control（VOC）is
an emerging grid-forming control method in recent years. Compared with
droop-based control strategies，it has advantages such
as faster response speed and stronger stability under large disturbances.However，there
is a problem of output power not following the reference value during grid
connected mode，which is currently one of the key
issues limiting its engineering applications.Firstly，a
virtual oscillator controller based on the Poincaré
bifurcation equation was designed， and a design scheme
for control parameters was provided.Then，based
on the power flow equation，the voltage amplitude
that satisfies the feasible solution of the power flow was calculated，which
was used as a voltage reference to update the input of the controller in real
time. Considering the difficulty in obtaining system information，an
integral control method was designed to compensate for steady-state errors，so
that the active and reactive power of the inverter can follow the reference
value during grid connected mode. Finally，the effectiveness of
the proposed method was verified through simulation examples based on Matlab/Simulink.
关键词(KeyWords)：韧性电网；虚拟振荡器控制；功率调度；非线性控制；逆变器控制
resilient
power grid；virtual
oscillator control；power
dispatch；nonlinear
control；inverter
control
基金项目(Foundation): 国家电网有限公司科技项目（5100-202317011A-1-1-ZN）
Science
and Technology Project of State Grid Corporation of China （5100-202317011A-1-1-ZN）
作者(Author): 史亚帆，许寅，吴翔宇
SHI Yafan，XUYin，WU
Xiangyu
DOI: 10.20097/j.cnki.issn1007-9904.2024.08.002
收稿日期(Received): 2023-12-25; 修回日期(Revised): 2024-02-19
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