Research on the New Power Phase Modifier for Stabilization of the Transmission Line having Instanteneous Compensation Ability.

介绍了一种采用旋转电机和电流控制PWM逆变器的输电线路实时有功无功控制系统。该系统既能补偿谐波、闪变、不平衡等功率畸变分量，又能补偿有功、无功电流的暂态变化和短时断电。该旋转电机与绕线转子感应电机结构相同，具有用于储能元件的飞轮。通过对旋转电机的二次绕组进行励磁，小容量PWM逆变器可以补偿上述电源线的所有畸变分量。因此，该系统非常经济，适合于输电线路的谐波补偿和振荡抑制。通过一个10kva的仿真模型，验证了该系统对电网稳定的有效性。实验仿真系统显示了以下结果：1. 采用多并联PWM逆变器，在相同开关频率下，谐波电流可降低至25%。它可以实现高速电流和高功率控制。2. 与传统的有源滤波系统相比，PWM逆变器的容量可减小约20%。由于变换器的功率流是单一的，因此可以使用二极管桥来构造变换器。3. 90%的有功功率来自飞轮的机械能。4. 该系统可以补偿13次谐波频率分量，包括随机闪烁分量。5. 有功功率的频率响应与电流控制器的频率响应基本相同，这取决于开关频率和逆变器容量。6. 利用由L、C、负载和同步机组成的传输线模拟器，对线路的振荡补偿能力进行了检验。有功功率的平滑控制对阻尼作用表现出较好的特性。少

An instanteneous active and reactive power control system on the power transmission line using a rotating machine and a current control PWM inverter is described. The system can compensate not only the power distortion component such as harmonic,flicker and unbalance components but also transient change of active and reactive currents and short time power-off. The rotating machine, which has the same structure as a wound-rotor induction machine, has a flywheel for the energy storage element. By exciting the secondary winding of the rotating machine, all of the distortion components of the power line described above can be compensated by the small capacity PWM inverter. Therefore the system is very economical and fits for the compensation of the harmonics and the suppression of the oscilation of the transmission lines.The research confirmed the validity of the system to the power network stabilization by using a 10 KVA simulation model. The experimental simulation system shows the follo … More wing results. 1. By using the multi-parallel connection PWM inverter, the harmonic current can be reduced to 25% under the same switching frequency. It enables the high speed current and high power control. 2. The capacity of the PWM inverter can reduce about 20% that of the conventional active filter system. The converter can be constructed by using the diode bridge because of the single power flow. 3. 90% of active power is fed from the mechanical energy of the flywheel. 4. The system can compensate under 13-th harmonic frequency components including random flicker component. 5. The frequency response of the active power is almost same as the response of the current controller which depends on the switching frequency and the inverter capacity. 6. By using a transmission line simulator composed of L, C, loads and a synchronous machine, the compensation ability of the oscilation of the line is checked. The smooth control of the active power shows fairly good characteristics to the damping action. Less