CAJ | 학술논문

并网光伏逆变装置越来越多地采用电感—电容—电感（LCL）滤波器,针对其固有谐振特性而采取的阻尼控制策略成为了研究热点。以LCL滤波器、逆变器、电网为整体进行建模研究,用无源阻尼和有源阻尼中最常用的虚拟电阻法,深入分析了逆变器控制行为和电网因素对阻尼效果的影响。研究结果表明,电网的非理想电压源特性、系统控制延迟等因素会影响阻尼性能。在此基础上提出了一种采用有源与无源阻尼相结合的控制方法,有效地减少了系统控制延迟的影响,保证了阻尼具有较好的电网参数适应能力。实验结果证明了所述方法的有效性。
병망광복역변장치월래월다지채용전감—전용—전감（LCL）려파기,침대기고유해진특성이채취적조니공제책략성위료연구열점。이LCL려파기、역변기、전망위정체진행건모연구,용무원조니화유원조니중최상용적허의전조법,심입분석료역변기공제행위화전망인소대조니효과적영향。연구결과표명,전망적비이상전압원특성、계통공제연지등인소회영향조니성능。재차기출상제출료일충채용유원여무원조니상결합적공제방법,유효지감소료계통공제연지적영향,보증료조니구유교호적전망삼수괄응능력。실험결과증명료소술방법적유효성。
LCL filters are increasingly used in grid-connected photovoltaic inverters as the preferred option.Its inherent resonance character makes the damping strategy a hot topic for research.LCL filter,inverter and the grid are modeled and studied as a whole.The commonly used virtual resistor method of passive and active damping,the impacts of inverter's behavior and the grid stiffness on the damping effect are studied in detail.The results show that the non-ideal characteristics of the grid,the proportional gain and the control delay affect the damping properties the most.A hybrid damping method combining active and passive damping is proposed.The method can reduce the impact of control delay and is adaptable for grid change.Experimental results show its effectiveness.