EXPERIMENTAL STUDIES ON SUPPRESSION OF FREQUENCY AND VOLTAGE DEVIATION OF WIND/DIESEL POWER GENERATION SYSTEM BY MEANS OF SUPERCONDUCTING MAGNETIC ENERGY STORAGE

为了验证前面的仿真结果，并阐明整个系统向实用化方向发展所要解决的问题，我们进行了为期两年的超导磁储能（SMES）风力/柴油混合发电系统的稳频稳压实验研究。主要研究结果如下：1.建立了风/柴油混合发电系统的模拟实验系统。感应发电机（风力发电机）由模拟风力涡轮机的感应电动机驱动，同步发电机（柴油发电机）由模拟柴油机的直流电动机驱动。这两台发电机通过一条人工输电线相互连接。感应电动机通过逆变器供电，直流电动机通过变流器供电。测量了系统的静态特性，其中， ...更多信息 异步发电机的负荷功率一定时，负荷功率增长缓慢。结果表明，异步发电机输出功率变化引起的频率偏差，使同步发电机调速器动作，同步发电机出力下降. SMES（最大线圈电流50 A，储能容量50 kJ）接入感应发电机端，通过感应发电机的角速度偏差来控制SMES的功率。通过SMES功率控制可以减小由于异步发电机输出的阶跃变化而引起的系统频率变化的超调和下调，在异步发电机输出正弦变化的情况下，SMES对高频变化的效果尤为突出，因为调速器的响应相对于SMES来说比较慢.考虑到超导磁储能系统的可控功率，超导磁储能系统对系统频率偏差的抑制效果并不理想，因此需要对控制方法进行改进。此外，还需要增加无功功率控制。少

We have for two years done experimental investigation on the frequency and voltage stabilization by superconducting magnetic energy storage (SMES) for the wind/diesel hybrid power generation system, in order to experimentally verify the results of the simulation we have done before, and to clarify the problems of the total system to be solved toward the practical use. The obtained results are follows.1. The simulated experimental system of a wind/diesel hybrid generation system was composed. The induction generator (wind power generator) is driven by an induction motor which simulates the wind turbine, and the synchronous generator (diesel generator) is driven by a dc motor which simulates the diesel engine. The two generators are interconnected through an artificial transmission line. The induction motor is fed with electric power through an inverter, and the dc motor is fed through a convertor.2. The static characteristics of the system were measured, where the output power from the … More induction generator was increased slowly with the load power fixed. As the results, it was verified that the governor of the synchronous generator was actuated by the frequency deviation caused by the output power variation of the induction generator, and the output from the synchronous generator was decresed.3. The SMES (maximum coil current : 50A,energy storage capacity : 50kJ) was connected to the induction generator terminal, and the power of the SMES was controlled by the angular velocity deviation of the induction generator. The overshoot and undershoot of the system frequency variation due to stepwise changes of the output of the induction generator could be decreased by means of the power control of the SMES.In case of sinusoidal changes of the induction generator output, the effect of the SMES was outstanding for the changes of high frequency, because the response of the governor is rather slow compared with the SMES.4. The suppression of the system frequency deviation by SMES was not so effective considering the amount of the controllable power by SMES.Hence, it was found needed to improve the control method. Also, the addition of the reactive power control is required. Less