CAJ | 학술논문

采用传统有功频率、无功电压幅值下垂控制时，若下垂系数选取不合理，逆变器输出功率会出现持续振荡，当微网离网运行时，逆变器输出功率的振荡会导致微网系统频率出现波动，严重时会使整个系统出现功角稳定性问题。文中基于储能逆变器动态频率特性的概念，根据其产生正阻尼作用的相位条件和幅值条件，提出了基于附加阻尼的改进下垂控制方法。该方法可以在不影响系统稳态频率和逆变器输出功率的前提下，有效地增加系统的阻尼，从而抑制逆变器输出功率振荡，提高系统的稳定性。最后通过 PSCAD 仿真，验证了所提控制策略的有效性。
채용전통유공빈솔、무공전압폭치하수공제시，약하수계수선취불합리，역변기수출공솔회출현지속진탕，당미망리망운행시，역변기수출공솔적진탕회도치미망계통빈솔출현파동，엄중시회사정개계통출현공각은정성문제。문중기우저능역변기동태빈솔특성적개념，근거기산생정조니작용적상위조건화폭치조건，제출료기우부가조니적개진하수공제방법。해방법가이재불영향계통은태빈솔화역변기수출공솔적전제하，유효지증가계통적조니，종이억제역변기수출공솔진탕，제고계통적은정성。최후통과 PSCAD 방진，험증료소제공제책략적유효성。
When the traditional active power versus frequency and reactive power versus voltage magnitude droop control is applied,if the droop coefficients are irrational,the output power of the inverter will keep oscillating.When the microgrid operates in the islanding mode,the microgrid frequency will fluctuate because of the output power oscillation of the energy storage inverter.When serious,there will be the power angle stability problem.Based on the concept of dynamic frequency-power characteristic,this paper proposes an improved droop control method according to phase condition and magnitude condition of positive damping.The improved droop control can effectively increase system damping to suppress the oscillation of output power of the inverter and improve system stability without affecting the steady state frequency and output power of the inverter.Finally,PSCAD simulation results have validated the feasibility of the proposed method.