Studies on Integrated Control Strategy for Power Systems by Distributed Allocation of Micro SMES Units

SMES（Superconducting Magnetic Energy Storage）具有有功功率和无功功率独立控制、充放电寿命长等优点，在电力系统稳定和电能质量改善方面具有广阔的应用前景。最近，分布式分配的一些小型超导磁储能单元（微型超导磁储能系统）的电压控制问题的解决进行了研究。如果将这些分散的微型SMES单元通过通信网络连接起来，并进行协调控制，则有可能提高它们的控制效果。基于上述观点，本研究探讨最佳配置的确定方法及抑制发电机摆幅的最佳控制策略。对禁忌搜索算法进行了优化配置和最优控制的研究，并对SMES控制系统仅采用本地信号和同时采用远方信号的控制效果进行了比较 ...更多信息 D.主要研究结果如下：1.建立了SMES最优配置和最优控制增益同时确定的方法，并验证了其有效性; 2.明确了安装微型SMES单元可以抑制相角初摆的峰值，提高初摆后振荡的阻尼; 3.研究发现，以相角偏差为性能指标进行优化，以远传信号为SMES控制系统的输入信号，减小了相角偏差，4.当角速度乘以β与性能指标相加时，角偏差的影响，在仅采用本地信号进行SMES控制的情况下，相角偏差随β值的增大而增大。研究发现，在加入遥信信号的情况下，随着β的增大，第一次摆幅后的相角振荡阻尼得到改善。当β值过大时，相位角收敛所需的时间会增加。5.在β值足够大的情况下进行优化，加入远程信号的控制比只加入本地信号的控制性能更好。少

Since SMES(Superconducting Magnetic Energy Storage) can control both active power and reactive power independently, and has long lifetime of charge and discharge, it is expected its application to power system stabilization and power quality improvement. Recently, the distributed allocation of a number of small SMES units (micro-SMES) is examined for solving the voltage control problem. If these distributed micro SMES units are connected through communication network, and controlled coordinately, their control effect can possibly be increased. From the above mentioned point of view, the determining method of optimal allocation and optimal control strategy for the suppression of generator swings were investigated in this study. Tabu search algorithm was examined for the optimal allocation and optimal control, and also, the comparison of control effect was done between the cases where just the local signals are used as the input for SMES control system and the remote signals are also use … More d. The main results are as follows.1.Established was the determining method of both the optimal SMES allocation and the optimal control gains simultaneously, and its validity was ascertained.2.It was made clear that the peak value of the phase angle first swing can be suppressed, and the damping of the oscillation after the first swing can be improved by installing micro SMES units.3.It was found that, when the phase angle deviation was used as the performance index for optimization, and the remote signals were used as the input signal for the SMES control system, the deviation of phase angle was reduced, but the oscillation with short period was observed after the first swing.4.When the angular velocity multiplied by β was added to the performance index with the phase angle deviation, the phase angle deviation was increased with the increase of the value of β in case of just the local signal used for the SMES control. It was found that, in case of the remote signals added, the damping of phase angle oscillation after the first swing is improved with the increase of β. With the too large value of β, however, the time for the phase angle convergence was increased.5.If the optimization was done with a adequate value of β, the control with remote signals added gave better performance than with just the local signal. Less