Transient voltage stability analysis of AC/DC unbalanced distribution system with DGs
The integration of distributed generations(DGs)and a large number of constant power DC loads connected to double-pole AC/DC distribution system makes the bus transient voltage exhibit the coupling characteristics between positive and negative poles and multi-fluctuation.The existing evaluation methods of transient voltage stability keep low accuracy and poor applicability.The factors affecting the transient vol-tage stability of the system bus are deduced and analyzed when the DC-side lines and load parameters of the double-pole AC/DC distribution system are unbalanced.An improved adaptive evaluation index of transient voltage stability for bus is proposed based on two-element notation criterions.A stability mainte-nance factor is introduced for unbalanced double-pole AC/DC distribution system containing DGs,and a transient voltage stability margin calculation method for bus and system is proposed.The MATLAB/Simu-link simulation platform is used to quantify the various factors affecting the transient voltage stability of the improved IEEE 33-bus and IEEE 69-bus double-pole AC/DC distribution systems based on the pro-posed method,which verifies the effectiveness and superiority of the proposed indicators.
transient voltage stabilityAC/DC systemunbalanced distribution networkDC fault analysis
万方数据
维普
