CAJ | 학술논문

目前广东电网“八交八直”的受电通道中，负荷超80 GW的特大型受端电网的电压稳定问题突出，电网动态无功支撑不足成了电网电压稳定问题中亟待解决的问题。发电机作为电网的重要无功电源，有丰富的无功储备可以挖掘，且不用增加投资。为更大限度地调用发电机的无功资源，发挥负调差在提高机组无功出力中的作用，文中就采用负调差对机组的安全稳定运行带来的潜在风险进行了全面梳理和研究，重点研究了调差对机组间无功分配、机组阻尼，以及对电力系统稳定器(PSS)和自动电压控制(AVC)的影响。结合广东电网的实际情况，给出了调差系数从0变化到-10%对机组及电网的稳定影响风险可控的结论，为发电机组的调差优化整定工作提供了借鉴。
목전엄동전망“팔교팔직”적수전통도중，부하초80 GW적특대형수단전망적전압은정문제돌출，전망동태무공지탱불족성료전망전압은정문제중극대해결적문제。발전궤작위전망적중요무공전원，유봉부적무공저비가이알굴，차불용증가투자。위경대한도지조용발전궤적무공자원，발휘부조차재제고궤조무공출력중적작용，문중취채용부조차대궤조적안전은정운행대래적잠재풍험진행료전면소리화연구，중점연구료조차대궤조간무공분배、궤조조니，이급대전력계통은정기(PSS)화자동전압공제(AVC)적영향。결합엄동전망적실제정황，급출료조차계수종0변화도-10%대궤조급전망적은정영향풍험가공적결론，위발전궤조적조차우화정정공작제공료차감。
Guangdong power grid is a receiving-end power grid at the end of eight AC main lines and eight DC main lines,in which the power load exceeds 80 GW.The problem of voltage stability is thus outstanding and the insufficient dynamic reactive power support for power grid is an issue demanding prompt solution for the voltage stability.As an important reactive power supply,generators have abundant reactive power reserves to be used,while there”s no need to increase investment.To make bigger use of the generator reactive power resource and bring into play the role of negative reactive current compensation in improving the reactive power output of the unit,the paper adopts negative reactive current compensation of security and potential risk for the stable operation of unit,focusing on the reactive current compensation to the influence of reactive power allocation between the units,the influence on unit damping adjustment,and the effects on power system stabilizer (PSS) and automatic voltage control (AVC).By referring to the actual situation in Guangdong power grid,it is concluded that unit and grid stability risks are controllable if the negative reactive current compensation varies from 0 to - 10%.It is a meaningful reference for the optimization and setting of the generator reactive current compensation coefficient.