CAJ | 학술논문

为使动态电压恢复器(dynamic voltage restorer,DVR)可以补偿稳态负载电压谐波,同时保证其动态响应特性,提出一种双闭环比例积分(proportional integral,PI)控制和多重比例谐振(proportional resonant,PR)控制并联运行的单相空间矢量脉宽调制(space vector pulse width modulation , SVPWM)复合控制策略.将SVPWM技术应用到DVR的H桥逆变单元,在引入单相坐标旋转变换的基础上分析了单相SVPWM的基本原理并给出了其实现方法.单相基波同步坐标系下双闭环PI控制保证了DVR对电压暂降的补偿效果,增加了对指定次谐波补偿的电压环多重PR控制,以代替多重同步旋转坐标下的PI 控制,实现了对指定次谐波电压的无静差补偿.理论分析和实验结果验证了提出的控制策略的有效性和可行性.
위사동태전압회복기(dynamic voltage restorer,DVR)가이보상은태부재전압해파,동시보증기동태향응특성,제출일충쌍폐배비례적분(proportional integral,PI)공제화다중비례해진(proportional resonant,PR)공제병련운행적단상공간시량맥관조제(space vector pulse width modulation , SVPWM)복합공제책략.장SVPWM기술응용도DVR적H교역변단원,재인입단상좌표선전변환적기출상분석료단상SVPWM적기본원리병급출료기실현방법.단상기파동보좌표계하쌍폐배PI공제보증료DVR대전압잠강적보상효과,증가료대지정차해파보상적전압배다중PR공제,이대체다중동보선전좌표하적PI 공제,실현료대지정차해파전압적무정차보상.이론분석화실험결과험증료제출적공제책략적유효성화가행성.
To ensure dynamic response performance of dynamic voltage restorer (DVR) and make it enable to compensate voltage harmonics from load in the steady state, a single-phase space vector pulse width modulation (SVPWM) based hybrid control strategy composed of double closed-loop proportional integral (PI) control and multiple proportional resonant (PR) control is proposed. Applying SVPWM to H-bridge inverter unit of DVR, on the basis of leading in single-phase coordinate rotating transformation the basis principle of single-phase SVPWM is analyzed and its implementation is given. The double closed-loop PI controller in single-phase fundamental synchronous coordinate environment can ensure the compensation effect of voltage sag by DVR, and multiple PR controller with harmonic voltage-loop for the compensation to specified order of harmonic is added to replace the PI controller in multiple rotating synchronous coordinate environment, thus the astatic compensation to harmonic voltage in specified order is implemented. The effectiveness and feasibility of the proposed control strategy are verified by results from theoretical analysis and experiments.