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Studies on DC System Interconnection by Means of Superconducting Magnetic Energy Storage

超导磁储能直流系统联网研究

基本信息

批准号：
61550205
负责人：
OHSAWA Yasuharu
金额：
$ 1.22万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
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

1. Experimental Studies on DC System Interconnection Using Superconducting Coil ; Two sets of 3-phase thyristor AC-DC converter were composed, and a experimental DC transmission system was constructed with the superconducting coil ( L = 95 H, I_<max> = 20 A, Energy Storage Capacity = 1. kj ), which connects two distribution boards. Experiments of power absorption and release were done by means of personal computer control. The specified values of power were i) constant power, ii) switching of absorption and release with constant power, and iii) sinusoidal absorption and release. It was confirmed from the experiments that the power can be controlled from the two DC interconnected subsystems independently. It takes, however, as long as about 0.3 sec to complete one cycle of the input of measured values, the computation and the output of the control value, which puts the limit of about 0.6 Hz on the switching frequency of power absorption and rellease. It is the future problems to improve … More the control strategy and the computer programming for control.2. Improvement of Steady-State Stability by DC System Interconnection with Superconducting Coil ; The system stabilizing effect of DC system interconnection and superconducting coil was examined regarding the steady-state stability on a sample longitudinal power system by means of the eigenvalue analysis. It was made clear from the results of the analysis that DC system interconnection fairly improves the steady-state stability, and that the energy storage capability of superconducting coil can stabilize the system further if the both converters are controlled appropriately. When there is a power flow on the interconnection line, the system from which the power flows out ( rectifier side ) is remarkably stabilized.3. Improvement of Transient Stability ; The power swing damping effect was examined on the same sample power system as above by means of computer simulation. The disturbance assumed was a tripping of a generator. By dividing the system by DC interconnection, the disturbance on one subsystem does noto almost affect the other subsystem. The introduction of a superconducting coil can makes the power swing damping faster. Less

1.超导线圈用于直流系统互联的实验研究利用超导线圈(L=95H，电流密度=20A，储能容量=1.KJ)连接两个配电盘，组成两套三相晶闸管AC-DC变流器，构成实验直流输电系统。利用PC机控制进行了能量吸收和释放实验。功率的规定值是i)恒定功率，ii)恒定功率的吸收和释放的切换，以及iii)正弦吸收和释放。实验证明，两个直流互联子系统均可独立控制功率。然而，完成测量值的输入、计算和控制值的输出的一个周期大约需要0.3秒，这使得功率吸收和继电的开关频率限制在0.6赫兹左右。改进…是未来需要解决的问题更多的是控制策略和用于控制的计算机编程。利用超导线圈提高直流系统的稳态稳定性利用特征值分析的方法，考察了直流系统互联和超导线圈对纵向电力系统稳态稳定性的影响。分析结果表明，直流系统互联可以较好地改善系统的稳态稳定性，而超导线圈的储能能力可以进一步稳定系统，只要两个变流器控制得当。当互联线路上有潮流时，功率流出的系统(整流侧)显著稳定。暂态稳定性的改善通过计算机仿真的方法，在相同的样本电力系统上检验了功率摆动的减振效果。这场骚乱被认为是发电机跳闸。通过直流互联来划分系统，一个子系统上的扰动几乎不会影响另一个子系统。超导线圈的引入可以使功率摆动的衰减更快。较少