摘要
针对采用阶梯波调制方法的链式静止同步补偿器(STATCOM),分析阶梯波导通方式对链节直流电容电压的影响,推导出可以确保平衡控制方法稳定性的损耗差异电阻取值允许范围,分析4种常规电容电压平衡控制方法的稳定极限.提出3种电容电压平衡控制方法,分别为:基于导通方式选择的控制方法1;基于触发脉冲最优分配的控制方法2;结合方法1和方法2、基于电压误差预测的控制方法3.阐述3种方法的控制原理和实现方式,对比分析3种方法的控制能力、动稳态性能、适用范围、算法复杂度等性能指标.3种控制方法均不改变各个链节的导通角、调制比等参数,不需采集电流信号,与上层无功补偿算法无耦合关系,电压偏差修正时间短,可以改善装置输出波形的质量,不增加装置成本.三相链式STATCOM实验平台的实验结果表明,稳定性理论和平衡控制方法可行且有效.
The influence of step wave conduction mode on the chain DC capacitor voltages was analyzed aiming at the cascade static synchronous compensator （STATCOM） based on step wave modulation. The allowable range of loss difference resistance ensuring the stability of balance control method was deduced, and the stability limit of four kinds of conventional capacitor voltage balance control method was analyzed. Three kinds of capacitor voltage balance control methods were proposed, respectively.- based on conduction select of the control method 1 ; based on the trigger pulse optimal allocation of the control method 2; based on the voltage error prediction of the control method which combines method 1 and method 2,3. The control principles and implementations of the three methods were introduced, and their control ability, steady and dynamic performance, application, algorithm complexity and so on were analyzed. The proposed three control strategies do not change the parameters of the conduction angle and the modulation ratio of each H-bridge~ and do not collect the current signal,and without coupling with the upper reactive power compensation algorithm, and with a short time on voltage deviation correction, and significantly improve the quality of the output waveform, and without increasing the device cost. The experimental results of three-phase cascade STATCOM experimental platform verified the stability theory and the proposed control strategies were feasible and effective.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2014年第4期600-609,615,共11页
Journal of Zhejiang University：Engineering Science
基金
陕西省重点学科建设专项资金资助项目(105-00X901)
