大容量往复式与涡轮机组并列运行稳定性分析

Stability analysis of large capacity reciprocating and turbine Generator parallel operation

海上石油平台发电机容量较小,且大负荷容量与发电机容量接近,系统抗冲击性能差。近年来低成本的往复式发电机组的广泛使用,使得暂态特性完全不同的往复式发电机组与涡轮发电机组并列运行越来越普遍,将导致海上石油平台电力系统稳定性存在问题。基于PSCAD/EMTDC仿真平台,对往复式发电机组与涡轮发电机组的调速系统建立了详细的模型,对两种机组分别运行与并列运行时突加突卸负荷对系统稳定性的影响进行分析,并将仿真结果与实际录波数据进行对比,验证了模型的正确性。实验和仿真计算表明,暂态特性完全不同的大容量往复式机组和涡轮机组并列运行,在合理设置机组运行模型下进行负荷突加突卸测试时,两台机组能够保持同步稳定运行。

The generator capacity of offshore oil platform is small, and the generator capacity is close to the large load capacity, resulting in poor system impact performance. Furthermore, the low-cost reciprocating generators are widely used, so it is inevitable that the reciprocating generators and the turbine generators run in parallel, which have completely different transient characteristics, these lead to a decrease in system stability. Based on the PSCAD/EMTDC simulation platform, detailed models are established for the speed regulation system of the reciprocating generator and the turbine generator. The influence of sudden load and sudden unload on the stability of the system is analyzed for single-unit operation and parallel operation of the units. And the simulation results are compared with the actual data. The correctness of the model and the stability of the system are verified, which lays a foundation for further research on the parallel operation of the units.