摘要
为使静止同步补偿器(STATCOM)兼备无功电流补偿和指定次谐波电流补偿功能,提出基于降阶广义积分(reduced order generalized Integrator,ROGI)控制策略。该策略在静止坐标系下分离基波有功电流、谐波电流和无功电流,采用多个准ROGI谐振控制器对指定次谐波电流进行补偿控制。为避免准ROGI控制器容易受频率变化影响的缺陷,通过锁频环估算电网频率,主动修正ROGI谐振控制器频率与指定次谐波电流频率保持一致,提高电网频率变化时的电流补偿效果。该策略在静止坐标系下进行,无需锁相环和dq变化环节。搭建实验样机,对所提方法进行实验验证。结果表明该策略能有效补偿指定次谐波和无功电流,并对电网频率变化具有自适应性。
In order to integrate the reactive current compensation and the selective harmonic current compensation ability for STATCOM(Static Synchronous Compensator),a reduced order generalized integral(ROGI)-based control strategy is proposed.It extracts the fundamental active current,harmonic current and reactive current in stationary reference frame,and the multi-ROGI(Reduced Order Generalized Integrator)resonant controllers are used to compensate the selected order harmonic current.The grid frequency is estimated by the frequency-locked loop,and the resonant frequency of the ROGI controller is actively adjusted according to the estimated frequency,which can improve the harmonic current compensation controller performance under the grid frequency variation conditions.The control strategy is carried out in the stationary reference frame.Thus,it does not require voltage phase-locked loop and synchronous rotation transform.The experimental prototype was built to verify the proposed control strategy.Experimental results show that the proposed control strategy can effectively compensate the selective harmonics and reactive current,and show the robustness for the grid frequency variation.
作者
钟诚
周晶
周扬
Zhong Cheng;Zhou Jing;Zhou Yang(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,China;College of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第7期71-77,共7页
Acta Energiae Solaris Sinica
基金
国家重点研发计划(2016YFB0900601)
国家自然科学基金联合基金重点项目(U1866601)。
关键词
电流控制
静止同步补偿器
电能质量
谐波畸变
谐振控制器
ROGI
current control
static synchronous compensators(STATCOM)
power quality
harmonic distortion
resonant controller
ROGI
