CAJ | 학술논문

通过分析建立配电网静止同步补偿器(D-STATCOM)在负载不平衡时各序等效电路中的数学模型，提出了将反馈线性化同时应用于正序、负序模型的控制策略。针对三相三线制下负载不平衡时电流可分解为正、负序分量的特点，分别在正、负序同步旋转坐标下进行补偿。其中，正序控制使装置发出负载需要的无功电流，提高功率因数；负序控制用于补偿由于负载不平衡出现的负序电流，从而使电网侧电流平衡达到国标要求。最后在PSCAD中搭建了10 Mvar/10 kV D-STATCOM系统进行仿真验证，证明了该控制策略补偿负载不平衡的同时能发出满足要求的无功功率，并且在电网侧出现超过国标的不平衡时仍能达到较理想的效果，显示出此控制策略的有效性。
통과분석건립배전망정지동보보상기(D-STATCOM)재부재불평형시각서등효전로중적수학모형，제출료장반궤선성화동시응용우정서、부서모형적공제책략。침대삼상삼선제하부재불평형시전류가분해위정、부서분량적특점，분별재정、부서동보선전좌표하진행보상。기중，정서공제사장치발출부재수요적무공전류，제고공솔인수；부서공제용우보상유우부재불평형출현적부서전류，종이사전망측전류평형체도국표요구。최후재PSCAD중탑건료10 Mvar/10 kV D-STATCOM계통진행방진험증，증명료해공제책략보상부재불평형적동시능발출만족요구적무공공솔，병차재전망측출현초과국표적불평형시잉능체도교이상적효과，현시출차공제책략적유효성。
The mathematical model of distribution static synchronous compensator (D-STATCOM) in each sequence equivalent circuit of unbalanced load is established and the feedback linearization applied to both the positive and negative sequence mathematical model is proposed. The three-phase three-wire unbalanced load current can be decomposed into the positive and negative sequence component, so they can be compensated in the synchronous rotating coordinates system of positive and negative sequence respectively. The positive sequence control makes D-STATCOM generate reactive current required by the load, improving the power factor. The negative sequence control is used to compensate the negative sequence current due to load unbalance in order to balance the grid side current and meet the requirements of National standard. At last, a 10 Mvar/10 kV D-STATCOM system is built in PSCAD, and the simulation results prove that the control strategy can compensate the load unbalance and generate reactive current required by the load at the same time. Furthermore, when the voltage unbalance in the grid side exceeds the national standard, the control strategy can also achieve the desired results, showing the effectiveness.