半波长交流输电点对网的并网特性分析和功率振荡阻尼

为研究半波长交流输电的点对网并网特性,通过PSCAD (power system computer-aided design)仿真,分析了并网点两侧电压存在幅值偏差、相角偏差或频率偏差时的并网特性。等值系统能将半波长线路另一端的发电机拉入同步,但并网后的功率振荡持续时间相对较长。通常,串联调谐器要比并联调谐器更适合于阻尼这些功率振荡,因此,仅对串联调谐器的控制策略进行修改。PSCAD仿真结果表明串联调谐器能有效地阻尼这些功率振荡,显著改善半波长交流输电线路的并网性能。

Grid Characteristics Analysis and Power Oscillation Damping of Point to Grid Connection for Half Wavelength Alternating Current Transmission

In order to study point to grid connection characteristics of a half-wavelength alternating current transmission (HWACT) line, its grid-connection characteristics were analyzed through PSCAD when there was an error in amplitude, phase angle or frequency of the voltages on both sides of the grid point. The equivalent system can pull the generator into synchronous operation via the HWACT line. However the power oscillation after grid-connection lasts relatively long. The series tuner is generally more effective than the parallel tuners to damp these power oscillations. Therefore the control of the series tuner was modified only. PSCAD simulation results show that the series tuner can damp effectively these power oscillations, which dramatically improves the grid-connection performance of the HWACT line.