电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
14期
126-130
,共5页
低电压穿越%三相不平衡%光伏并网逆变器%控制方法%正负序分量检测
低電壓穿越%三相不平衡%光伏併網逆變器%控製方法%正負序分量檢測
저전압천월%삼상불평형%광복병망역변기%공제방법%정부서분량검측
low voltage ride-through%three phase unbalance%photovoltaic grid-connected inverter%control method%detection of positive and negative sequence component
为了满足光伏并网逆变器在三相电网电压不对称跌落情况下的低电压穿越能力的要求,提出了一种电流正负序同步旋转坐标独立控制的方法,以抑制负序电流和并网电流谐波,使得光伏并网逆变器在三相电网电压不平衡跌落过程中能够正常运行,且不影响电网电能质量.特别地,对电网电压正负序分量的检测进行了详细研究,分析了两种不同的电网正负序分量检测方法的优缺点,优选一种方法进行了实验验证.所提出的低电压穿越控制方法通过了国家电网的零电压穿越认证,证明了该技术方案的有效性.
為瞭滿足光伏併網逆變器在三相電網電壓不對稱跌落情況下的低電壓穿越能力的要求,提齣瞭一種電流正負序同步鏇轉坐標獨立控製的方法,以抑製負序電流和併網電流諧波,使得光伏併網逆變器在三相電網電壓不平衡跌落過程中能夠正常運行,且不影響電網電能質量.特彆地,對電網電壓正負序分量的檢測進行瞭詳細研究,分析瞭兩種不同的電網正負序分量檢測方法的優缺點,優選一種方法進行瞭實驗驗證.所提齣的低電壓穿越控製方法通過瞭國傢電網的零電壓穿越認證,證明瞭該技術方案的有效性.
위료만족광복병망역변기재삼상전망전압불대칭질락정황하적저전압천월능력적요구,제출료일충전류정부서동보선전좌표독립공제적방법,이억제부서전류화병망전류해파,사득광복병망역변기재삼상전망전압불평형질락과정중능구정상운행,차불영향전망전능질량.특별지,대전망전압정부서분량적검측진행료상세연구,분석료량충불동적전망정부서분량검측방법적우결점,우선일충방법진행료실험험증.소제출적저전압천월공제방법통과료국가전망적령전압천월인증,증명료해기술방안적유효성.
To meet the requirements to low voltage ride-through (LVRT) capability of photovoltaic grid-connected inverter under three-phase voltage unbalanced dips, this paper proposes a current positive sequence synchronous rotational coordinate independent control method. In the strategy, the positive and negative sequence component is controlled independently. So that the negative sequence current and the grid current harmonics can be retrained. So the photovoltaic grid-connected inverter can work well at LVRT situation, and shall not affect the power quality of power grid. The positive and negative sequence component detection of the grid voltage are studied in detail and the pro and con of two detection methods are analyzed and one of them is selected and verified. The LVRT method proposed has passed the no voltage ride-through certification, which verifies the effectiveness of the proposed technical solution.
