针对并网型飞轮储能系统的双电流闭环比例谐振控制

doi:10.3969/j.issn.1000-7229.2019.03.006

摘要/Abstract

摘要： 文章提出一种适用于飞轮储能系统并网的双电流闭环控制方法。在电网侧及飞轮侧控制系统中同时引入比例谐振控制器，避免了比例积分（proportional integral，PI）控制器跟踪正弦电流存在稳态误差的缺点，提高了系统的稳定性及电网电能质量。同时，采用电容电流内环反馈控制抑制LCL滤波器的谐振尖峰，提高进网功率因数。在充电阶段，电网侧变换器采用电压外环控制方式，飞轮侧变换器采用转速外环控制方式；在待机及并网运行阶段，电网侧变换器采用电网侧电流外环电容电流内环的控制策略，飞轮侧变换器采用直流母线电压外环电流内环的控制策略，以稳定直流母线电压。采用广义根轨迹法对电网侧控制器参数进行设计。搭建了飞轮储能系统并网控制模型，仿真结果验证了文章控制策略的有效性。

关键词: 飞轮储能系统, 比例谐振控制器, 电容电流反馈, LCL滤波器, 广义根轨迹

Abstract: A dual current closed-loop control method for grid-connected flywheel energy storage system is proposed. To track the given sinusoidal current and simultaneously improve system stability and power quality， proportional resonant (PR) controller is introduced into the grid-side control loop and flywheel-side control loop. Capacitor current inner-loop feedback control can suppress the LCL filter resonance peak and improve the power factor. At charge stage， the control of grid-side converter works on an outer voltage loop， while the flywheel-side converter adopts an outer speed loop. At standby and grid-connected stage， the control of grid-side converter adopts direct power control strategy based on a grid-side current loop cascaded with an inner capacitor current loop；the control of flywheel-side converter is based on an outer DC-bus voltage loop cascaded with an internal current loop， and maintains the DC-bus voltage. The parameter of grid-side controller is designed using the generalized root locus method. The grid-connected control model of the flywheel energy storage system is built， and simulation results validate the effectiveness of the control strategy.

Key words: flywheel energy storage system, proportional resonant controller, capacitive current feedback, LCL filter, generalized root locus

中图分类号:

TM 910
TK 02

宋兆鑫，张建成，赵霁晴，郭伟. 针对并网型飞轮储能系统的双电流闭环比例谐振控制[J]. 电力建设, 2019, 40(3): 42-50.

SONG Zhaoxin， ZHANG Jiancheng， ZHAO Jiqing， GUO Wei. Dual Current Closed-loop Proportional Resonant Control for Grid-connected Flywheel Energy Storage System[J]. Electric Power Construction, 2019, 40(3): 42-50.

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