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Study on High Rsponse Excitation of Superconducting Generator

超导发电机高频响应励磁研究

基本信息

批准号：
61460117
负责人：
OKADA Takao
金额：
$ 3.65万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Low synchronous impedance of superconducting generators (SCG's) improves power system stability. If high response exitation is possible in SCG, it could improve power system stability much more. For SCG with high response exitation, wer have many problems to be solved. One of the problems is how to design the exiciter. Since time constant of field circuit of SCG is very large, the capacity of the exciter may be very large. Thyristor convertors, which are used as exciters of the conventinal generators bring some problems, that is large capacity, reactive power, current harmonics and so on. Here we propose a new method of exciter with a small power supply and an energy transfer circuit between two superconducting coils. one of them is for storage and the other is field winding of SCG. The power supply, which consists of thyristor converter, supplies energy to the coil for storage. The energy is transfered from the coil for storage to the field winding through energy transfer circuit. The capacity of the power supply is rather small since it supplies only small energy for the loss of the system in the steady state. In rapid change of the field current for high response excitation, the current is supplied from the coil for storage. Though the converer is small from a point of AC side, the exciter looks large capacity for the field winding. The fundamental tests, that is, tests for energy tranfer, step response test, frequency response test and so on, were carried out by use of two superconducting coils. They confirmed that the exciter can operate well.Furthermore, we considered characteristics of field circuit of SCG and power system characteristics of SCG.

超导发电机的低同步阻抗提高了电力系统的稳定性。如果SCG可以实现高响应励磁，则可以进一步提高电力系统的稳定性。对于高响应激励的SCG来说，有许多问题需要解决。其中一个问题是如何设计词典。由于SCG励磁回路的时间常数很大，激励器的容量可能会很大。晶闸管变流器作为常规发电机的励磁装置，存在容量大、无功大、电流谐波大等问题。本文提出了一种新的小电源励磁方法，并在两个超导线圈之间设置了能量传递电路。一种是用于储存，另一种是SCG的励磁绕组。电源由晶闸管变流器组成，向线圈提供能量以供储存。通过能量传递电路将能量从线圈存储到磁场绕组。电源的容量相当小，因为它只为系统在稳态时的损耗提供很小的能量。对于高响应励磁，在励磁电流快速变化的情况下，电流由线圈提供存储。虽然变流器从交流侧看很小，但励磁器对于励磁绕组来说容量很大。利用两个超导线圈进行了基本测试，即能量传递测试、阶跃响应测试、频率响应测试等。此外，考虑了SCG励磁回路的特点和SCG的电力系统特性。