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

超导磁能储能系统（SMES, Superconducting Magnetic Energy Storage）既能独立控制有功功率又能独立控制无功功率，且充放电寿命长，有望在稳定电力系统和改善电能质量方面得到应用。近年来，为了解决电压控制问题，研究了一些小型中小企业（micro-SMES）的分布式配置。如果通过通信网络将这些分散的微型中小企业单元连接起来，并进行协调控制，就有可能提高其控制效果。从上述角度出发，本文研究了抑制发电机摆动最优配置的确定方法和最优控制策略。研究了禁忌搜索算法的最优配置和最优控制，并对仅使用本地信号作为中小企业控制系统输入与使用远程信号作为控制系统输入的控制效果进行了比较。建立了中小企业最优配置和最优控制收益同时确定的方法，并对其有效性进行了验证。通过安装微型SMES装置，可以抑制相角一摆的峰值，提高一摆后振荡的阻尼。研究发现，以相角偏差作为优化的性能指标，将远程信号作为中小企业控制系统的输入信号，相角偏差减小，但在第一次摆动后出现周期短的振荡。将角速度乘以β与相角偏差加到性能指标中，当仅使用局部信号进行SMES控制时，相角偏差随β值的增大而增大。结果表明，在加入远端信号的情况下，随着β的增加，第一次摆幅后相角振荡的阻尼得到改善。当β值过大时，相角收敛所需的时间增加。如果在适当的β值下进行优化，则添加远程信号的控制比仅添加本地信号的控制具有更好的性能。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