CAJ | 학술논문

为了提高孤岛检测速率，改善并网电流波形质量，在传统AFD扰动方式基础上提出了一种新的改进型电流扰动策略。对传统AFD而言，截断系数cf越大则电流畸变率越大，而cf较小则检测效率降低。因此，如何在孤岛检测效率与电流畸变之间取得良好平衡是孤岛检测问题中的难点。所提出的电流扰动法对并网电流施以变步长 cf 扰动，能有效改善稳定电流波形THD，同时在负半波加强扰动量能提高检测速率。理论分析与仿真试验均验证了该新型扰动策略的正确性和可靠性。
위료제고고도검측속솔，개선병망전류파형질량，재전통AFD우동방식기출상제출료일충신적개진형전류우동책략。대전통AFD이언，절단계수cf월대칙전류기변솔월대，이cf교소칙검측효솔강저。인차，여하재고도검측효솔여전류기변지간취득량호평형시고도검측문제중적난점。소제출적전류우동법대병망전류시이변보장 cf 우동，능유효개선은정전류파형THD，동시재부반파가강우동량능제고검측속솔。이론분석여방진시험균험증료해신형우동책략적정학성화가고성。
To improve the efficiency of island detection and the quality of current waveform, a new current disturbance strategy is proposed based on the traditional AFD. As to the traditional AFD, the rising of chopping fraction (cf) leads to more current distortion and the smaller cf resulted in low efficiency of island detection. Therefore, it’s difficult to achieve good balance between the efficiency of island detection and current distortion in anti-islanding detection. Now the proposed current perturbation method can effectively improve the THD of stable current by applying variable step disturbance on grid current. And the new method also improves the rate of detection by strengthening disturbance in negative half wave. Theoretical analysis and simulation experiment prove the validity and reliability of the strategy.