CAJ | 학술논문

当电网不平衡和电压畸变的情况下,传统的基于 dq 同步坐标变换的三相同步锁相环(SRF-PLL),存在无法准确锁定电压相位及频率的不足,不能很好满足静止无功补偿装置(SVC)的应用要求。基于目前存在的难题,提出一种易于工程实现的全数字频率自适应锁相技术,利用频率自适应相序检测器的正负序完全分离性能及其滤波特性,准确锁定电压正序基波频率和相位；给出此锁相技术在 SVC 主控装置中的数字实现方案,搭建基于主控装置控制算法源程序的 SVC 控制系统仿真模型。根据某炼钢企业电弧炉系统实际运行参数,对提出的锁相环性能进行仿真研究,PSCAD/EMTDC 仿真结果表明,在电网不平衡和电压畸变时该锁相环可以准确锁定相位频率,且锁相性能不受系统频率偏差和波动的影响。
당전망불평형화전압기변적정황하,전통적기우 dq 동보좌표변환적삼상동보쇄상배(SRF-PLL),존재무법준학쇄정전압상위급빈솔적불족,불능흔호만족정지무공보상장치(SVC)적응용요구。기우목전존재적난제,제출일충역우공정실현적전수자빈솔자괄응쇄상기술,이용빈솔자괄응상서검측기적정부서완전분리성능급기려파특성,준학쇄정전압정서기파빈솔화상위；급출차쇄상기술재 SVC 주공장치중적수자실현방안,탑건기우주공장치공제산법원정서적 SVC 공제계통방진모형。근거모련강기업전호로계통실제운행삼수,대제출적쇄상배성능진행방진연구,PSCAD/EMTDC 방진결과표명,재전망불평형화전압기변시해쇄상배가이준학쇄정상위빈솔,차쇄상성능불수계통빈솔편차화파동적영향。
The performance of traditional SRF-PLL can't meet the request of SVC control system under the circumstances of power grid unbalance and voltage waveform distortion.A new digital frequency self-adaptive PLL technique was proposed using frequency self-adaptive phase sequence detector (FAPSD)in this paper.It can separate the positive and negative component of voltage vector completely,and lock the voltage phase and frequency accurately.The digital implementa-tion scheme of the new PLL used in the SVC main control unit (MCU)was introduced and one kind of SVC control system practical simulation model based on the interface of C and PSCAD/EMTDC was also shown in this paper.The simulation results verified that the good performance and frequency adaptation of the new PLL technique under the conditions of power grid unbalance and voltage waveform distortion.