基于简单占空比调制的动态扇区直接功率控制研究  

Research on Dynamic Sector Direct Power Control Based on Simple Duty Cycle Modulation

作　　者：吉培荣[1,2] 刘超 张赟宁[1,2] 韩国栋[1,2] JI Peirong;LIU Chao;ZHANG Yunning;HAN Guodong(School of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,Hubei,China;Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]三峡大学新能源微电网湖北省协同创新中心,湖北宜昌443002

出　　处：《电网与清洁能源》2022年第2期27-34,共8页Power System and Clean Energy

基　　金：国家自然科学基金项目(61603212)。

摘　　要：传统动态扇区直接功率控制系统中,直流侧电压动态响应慢,功率脉动较大。为解决此问题,在扇区划分过程中将直流电压可能发生较大波动的暂态时刻考虑在内,采用电压瞬时值进行扇区的分块划分。其次根据有功功率和无功功率偏差值的比较,引入功率误差比较,两电平滞环比较器,并提出更加精确的开关表。通过开关表得到有效矢量之后,为了减少功率脉动和系统对高采样频率的依赖,在一个控制周期内同时引入零矢量来优化功率波形,并根据所提开关表的规律简化占空比函数,能够在开关表读取的同时通过功率误差信息直接计算占空比,且避免了复杂的功率计算导致系统鲁棒性能的下降。仿真结果表明,所提方案能够有效降低系统功率脉动和电流谐波,提高系统动态响应能力。In the traditional dynamic sector direct power control system,the dynamic response of the DC side voltage is slow and the power pulsation is large.To solve this problem,the transient moment when dc voltage may fluctuate greatly is taken into account in the process of sector division,and secondly according to comparison of the active power and reactive power deviations,the power error is introduced to compare two level hysteresis comparators and a more precise switch table is put forward.After the valid vector is obtained from the switch table,to reduce the power pulsation and the dependence of the system on high sampling frequency,the zero vector is introduced to optimize the power waveform in one control period,and the duty cycle function is simplified according to the law of the proposed switch table so that the duty cycle can be calculated directly from the power error information while the switch table is being read,and the degradation of system robustness caused by complex power calculation can be avoided.The simulation results show that this proposed scheme can effectively reduce the power ripple and current harmonics,and improve the dynamic response ability of the system.

关 键 词：动态扇区 功率脉动 占空比 动态响应 

分 类 号：TM461[电气工程—电器]