汽轮发电机组次同步谐振及轴系扭振试验研究

分析了具有串联补偿电容电力系统机电扭振互作用的机理,构建了次同步谐振下的扭振测试系统,进行了机电耦合互作用下的次同步谐振及轴系扭振的试验。试验分析了不同补偿度下的扭振信号和发电机电流信号,试验表明补偿度越高,电力系统中次同步谐振电流越大,次同步谐振发生的危险性也越大。试验结果与模拟系统在电网故障工况下次同步谐振的数字仿真结果一致,说明了试验的有效性和它的实用价值。

Experimental research on subsynchronous resonance and torsion vibration on turbo-generator rotor shaft units

The mutual effect mechanism of electromechanical torsion vibration for the series compensation capacitance in power system is analgzed. The torsion vibration testing system is established. The subsynchronous resonance experiment is carried out under electromechanical coupling effect. The torsional vibration signals at different compensating degrees and generator's current signals are analyzed. The testing results show that as the compensating degree increases, the subsychronous current becomes bigger. It is easier to induce subsynchronous resonance. The experimental result is in accordance with the digital simulation result.