| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系碩士班 === 94 === Most of loads in the distribution power system have the characteristic of inductance, and it will result in the poor power factor. In order to solve the problem poor power factor, power substations and power consumers generally install the AC power capacitors parallel connected to the distribution power system, so as to compensate for a lagging reactive power to increase the entire power factor. However, the AC power capacitors supply a fixed reactive power that cannot be adjusted to respond the variation of loads. Therefore, the automatic power factor regulator (APFR) and Fixed-Capacitor Thyristor-Controlled Reactor (FC-TCR) are developed. The reactive power is adjustable in these reactive power compensation equipments, but it still cannot avoid the problem of damage caused by the harmonic resonance.
A static reactive power compensator based on digital signal processor (DSP) is developed in this thesis. The supplied reactive power can be adjusted linearly to respond to the variation of loads, and the supplied current is approximated to be a sinusoidal waveform. However, the static reactive power compensator must compensate the full reactive power required by the loads. Hence, the wide application is limited due to the high cost. A hybrid reactive power compensator, comprised a passive type reactive power compensator in series with a static reactive power compensator, is proposed in this thesis. The function of hybrid reactive power compensator is similar to the conventional static reactive power compensator. However, its cost less than that of the conventional static reactive power compensator. Finally, a novel power converter configuration is proposed for hybrid reactive power compensator. This power converter can reduce the required number of power electronic devices.
In this thesis, three DSP based static reactive power compensators; conventional static reactive power compensator, hybrid type reactive power compensator and two-arm bridge hybrid type reactive power compensator are implemented. The experimental results verify that these hybrid reactive power compensators have the expected performance.
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