Tri Desmana Rachmildha

Hybrid direct power control using p-q-r power theory applied on 3-phase 4-wire active power filter

An hybrid control approach of the p-q-r power theory applied to a 3 phase 4 wire active power filter is proposed. The mathematical model developed is based on the direct power control theory. This technique inherits not only the simplicity of the conventional direct power control but also offers a good dynamic response in active filtering. The analysis is verified using the PSIM simulation software.

Comparison of direct power control with hybrid approach on 3-Phase 4-wire active power filter between p-q-0 and p-q-r power theory

New hybrid control approach of the pq control theory applied to the 3 phase 4 wire active power filter is proposed. This technique inherits not only the simplicity of the conventional direct power control but also offers a good dynamic response in active filtering. In this paper, the proposed control method is implemented for two different instantaneous power theories, i.e. p-q-0 and p-q-r power theory. The comparison between them is oriented around the harmonic contain of the source current for each method and the unbalanced current index. The analysis is verified using the PSIM simulation software.

Single phase boost inverter using hybrid modelling approach

Boost inverters provide the ac voltage from lower dc voltage source without additional transistor switches compared to the conventional inverters. Some control shave already been proposed to control boost inverters, but most control methods are based on small signal analysis and nonlinear models which make computation complicated and require fine tuning. In this paper, the authors propose a control scheme based on the hybridmodel. The method does not require complicated mathematical formulas and allows easier tuning. The simulation results show that the boost inverter can achieve a good performance using this control approach.

A study of combined system of capacitor bank and shunt active power filter

Combined system of capacitor bank and shunt active power filter is proposed. Mathematical model developed in this proposed combined system is based on direct power control theory using pq0 theory. Different with conventional shunt active power filter which reactive power is compensated, here only the ripple components of reactive power is compensated. The average components of reactive power will be provided by capacitor bank. Using this proposed compensation scheme, the rating of the shunt active power filter will be significantly reduced. Simulation results are shown to verify the proposed analysis.

Investigation on the zero speed sensorless capability of 9-slot 8-pole with asymmetrical-winding PM brushless DC motor

Odd stator slot-number permanent magnet brushless DC motor with asymmetrical-winding has the advantage of unique flux distribution in the stator slot. It could be explored to make sensorless control using flux linkage variation method for this kind of machine. This paper investigates the capability of the 9-slot 8-pole PM BLDC motor to be controlled sensorless from zero speed. The results show that there are significant difference of the flux linkage distribution for each rotor position.

The effect of safe ball size changes on boost converter using hybrid control

Boost converter is one of power converters which are used to fulfill the need of electricity, such as in commuter line and renewable energy power plant This converter is a non-linear converter which is applied by controlling switching in order to get the intended output. Hence, it is difficult to be controlled with a common controller such as VCM and CCM which are linier controllers. Therefore, the converter must be turned into limer beforehand. Some researchers have proposed Hybrid control, a non-linear controller, to solve the problem. This controller works by keeping the state not to run outside of safe ball so that it is able to provide stable output when there is some disturbance on input and output However, this controller has some demerits; big ripples and high switching frequency. In this paper, hybrid control with minimum switching control had been simulated. We analyzed the changes of safe ball size to achieve the output with small ripple and error on low switching frequency. The size of the safe ball was changed by putting it closer to the reference point which means reducing the ball size as much as 25% from Bmax until it becomes zero. The result of the simulation with PSIM shows that 50% Bmax provides optimum output.

Multicell inverter using simple hybrid control

Multicell inverter is a power electronic circuit which is capable of generating AC voltage output that has low ripple. In this paper, the use of hybrid control in multicell inverter was analyzed with the aim of producing a low ripple with an easy and efficient control. The basis of the hybrid control is to minimize the cosine value of the angle between x-xd and fn(x). The output of the hybrid control is the bits that set the switching components. The process of calculation was done for each time sample which is equal to 60μS. Simulations and experiments was conducted using 3 reference values, one reference of inductor current and two reference of capacitors voltage. The reference value of inductor current 1 is 2/3 Yin and the reference value of capacitor voltage 2 is 4/3Vin. Output ripple of voltage happened quite a lot and producing lower ripple can be done by changing the sample time or changing the value of the inductor.

Hybrid modeling of boost inverter using minimum ripple control

A boost inverter topology offers higher ac output voltage while using lower dc input. This topology can be a transformer-less solution for low level dc voltage grid-connected inverter or used for low dc-voltage embedded inverter-motor drives. This paper presents a hybrid modeling of two boost converters, connected as a boost inverter. Each boost converter is controlled independently producing sinusoidal voltage at the output. The simulated result is obtained using MATLAB/Simulink and PSIM simulation software.

Angle based fast direct power control approach applied on 3-phase 4-wire active power filter

A new fast hybrid control approach of the pq control theory applied to the 3 phase 4 wire active power filter is proposed. The mathematical model developed is based on the direct power control theory using the pq theory. This technique inherits not only the simplicity of the conventional direct power control but also offers a good dynamic response in active filtering. The analysis is verified using the PSIM simulation software.