電(dian)能(neng)質(zhi)量(liang)(Power Quality)即(ji)電(dian)力(li)係(ji)統(tong)中(zhong)電(dian)能(neng)的(di)質(zhi)量(liang)。理(li)想(xiang)的(di)電(dian)能(neng)應(ying)該(gai)是(shi)對(dui)稱(chen)的(di)正(zheng)弦(xian)波(bo)。一(yi)些(xie)因(yin)素(su)會(kuai)使(shi)波(bo)形(xing)偏(pian)離(li)對(dui)稱(chen)正(zheng)弦(xian)，由(you)此(ci)便(pian)產(chan)生(sheng)了(liao)電(dian)能(neng)質(zhi)量(liang)問(wen)題(ti)。一(yi)方(fang)麵(mian)我(wo)們(men)研(yan)究(jiu)存(cun)在(zai)哪(nei)些(xie)影(ying)響(xiang)因(yin)素(su)會(kuai)導(dao)致(zhi)電(dian)能(neng)質(zhi)量(liang)問(wen)題(ti)，一(yi)方(fang)麵(mian)我(wo)們(men)研(yan)究(jiu)這(zhe)些(xie)因(yin)素(su)會(kuai)導(dao)致(zhi)哪(nei)些(xie)方(fang)麵(mian)的(di)問(wen)題(ti)，我(wo)們(men)要(yao)研(yan)究(jiu)如(ru)何(he)消(xiao)除(chu)這(zhe)些(xie)因(yin)素(su)，從(zong)而(er)使(shi)電(dian)能(neng)接(jie)近(jin)正(zheng)弦(xian)波(bo)。電(dian)能(neng)質(zhi)量(liang)從(zong)普(pu)遍(bian)意(yi)義(yi)上(shang)講(jiang)是(shi)指(zhi)好(hao)的(di)供(gong)電(dian)，包(bao)括(kuo)電(dian)壓(ya)質(zhi)量(liang)、電(dian)流(liu)質(zhi)量(liang)、供(gong)電(dian)質(zhi)量(liang)和(hu)用(yong)電(dian)質(zhi)量(liang)。其(qi)可(ke)以(yi)定(ding)義(yi)為(wei)：導(dao)致(zhi)用(yong)電(dian)設(she)備(bei)故(gu)障(zhang)或(huo)不(bu)能(neng)正(zheng)常(chang)工(gong)作(zuo)的(di)電(dian)壓(ya)、電(dian)流(liu)或(huo)頻(pin)率(shuai)的(di)偏(pian)差(chai)，其(qi)內(nei)容(rong)包(bao)括(kuo)頻(pin)率(shuai)偏(pian)差(chai)、電(dian)壓(ya)偏(pian)差(chai)、電(dian)壓(ya)波(bo)動(dong)與(yu)閃(shan)變(bian)、三(san)相(xiang)不(bu)平(ping)衡(heng)、暫(zan)時(shi)或(huo)瞬(shun)態(tai)過(guo)電(dian)壓(ya)、波(bo)形(xing)畸(ji)變(bian)（諧(xie)波(bo)）、電(dian)壓(ya)暫(zan)降(xiang)、中(zhong)斷(duan)、暫(zan)升(sheng)以(yi)及(ji)供(gong)電(dian)連(lian)續(xu)性(xing)等(deng)。