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Brushless doubly fed induction generator (BDFIG) shows high reliability in either grid-connected or stand-alone applications due to its brushless structure. However, the brushless structure results in a complicated electromagnetic feature. The BDFIG controller design is thus challenged. The recent controller design either ignores the usefully model information or requires the complicated feedforward...
In order to improve the accuracy of the harmonic current compensation for the single-phase shunt active power filter, a compound control strategy is proposed with the PI control and repetitive paralleling based on the stationary frame, PI control is used to guarantee the system dynamic performance, the repetitive control is to improve the output current tracking accuracy for the load harmonic current...
Capacity proportion frequency allocation compensation parallel control strategy based on the multiple synchronous rotating reference coordinates control is proposed to overcome difficulties in the field of high power application. The zero steady-state error compensation is implemented and the overall stability of the system may be improved by the multiple synchronous rotating reference coordinates...
Three-phase shunt active power filter (APF) are often used to compensate the harmonic and reactive current derived from non-linear load. But many non-ideal factors, such as the limited bandwidth of output current loop and the time lag of signal sensing circuit and reference current generation etc, will deteriorate the compensation effect. Proportion-integral (PI) controller cannot be used simply to...
In this paper, a new DC current measuring method using current transformer is put forward in this design, which can both reducing the cost of current sensor component and fulfilling the requirement of current detecting, simply adding a diode and a resister. A digital controlled battery charger based on microprocessor for high power UPS application is also presented. A two-stage charging strategy along...
Based on an in-depth analysis of the DC imbalance problem of UPS inverters, an observation is made that in most cases where instantaneous voltage feedback control is applied, the control algorithm itself is the most significant cause of DC imbalance since it inevitably generates DC bias in the output PWM gating signals. This situation becomes even worse when some integral action is included in the...
In inverters, the waveform distortions in output voltage caused by the dead times can be successfully compensated by the instantaneous voltage feedback regulators like PI regulator, and this always makes the dead time effects in parallel inverters be ignored. However, for the filter inductances and output impedances in high power inverters must be very small (for consideration of system cost, internal...
A unified power flow controller (UPFC) has the potential of controlling transmission line real power, reactive power and node voltage. It is one of the most promising FACTS devices. In this paper operation principle and model of UPFC are introduced, and a novel double PI decouple control strategy is proposed. A current feed-forward control is introduced into current inner loop of dc-link capacitor...
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