CAJ | 학술논문

针对三相不平衡电压暂降，以及动态电压恢复器对电压检测的实时性要求，在常用dq变换的基础上，提出一种新的检测方法。该方法将模糊控制应用于数学形态滤波器，对电网中的谐波、随机以及脉冲等多种干扰进行初次滤除。再对各单相电压使用求导的方法，分别得到三相虚拟电压。最后对虚拟电压进行dq变换并用新型滤波器替代传统巴特沃斯低通滤波器，可实时、准确地检测出电压暂降起始与结束时间、幅值以及相角变化。通过仿真证明该方法与传统dq检测方法相比具有抗干扰能力强，延时小，运算简单的优点。
침대삼상불평형전압잠강，이급동태전압회복기대전압검측적실시성요구，재상용dq변환적기출상，제출일충신적검측방법。해방법장모호공제응용우수학형태려파기，대전망중적해파、수궤이급맥충등다충간우진행초차려제。재대각단상전압사용구도적방법，분별득도삼상허의전압。최후대허의전압진행dq변환병용신형려파기체대전통파특옥사저통려파기，가실시、준학지검측출전압잠강기시여결속시간、폭치이급상각변화。통과방진증명해방법여전통dq검측방법상비구유항간우능력강，연시소，운산간단적우점。
In order to identify unbalanced three-phase voltage sags characteristics, as well as to meet the real time voltage detection requirements of dynamic voltage restorer, a new method based on traditional dq transformation to detect voltage sags is presented. At first, the fuzzy control is applied to mathematical morphology filter to pretreat harmonics and random/impulse noise in power grid. Then, a derivative method is used for each single-phase voltage to obtain a three-phase virtual voltage. Finally, voltage sags can be detected instantaneously with duration, magnitude and phase-angle jump when three-phase virtual voltage is treated by dq transformation and new filter replaces Butterworth low-pass filter. Compared with traditional dq detection algorithm, this method has advantages of good anti-jamming capability, high speed in execution as well as simple implementation.