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Nowadays, DSP based design for power electronics system is rapidly increasing and the design complexity with advanced algorithm is more complex than before. Even two or three power converter stages are combined in a single system. Accordingly, a lot of considerations such as switching frequency, rated current, rated voltage, passive components and controller gains make it hard for engineer to design...
Recently, The necessity of renewable energy be on the rise in as fossil fuel is depleted. Study of offshore wind power generation is being carried out as part of the renewable energy business. The 3-level inverter for use in the offshore wind power system studied is increasing as high capacity about offshore wind power. The 3-level inverter had an advantage that make reference voltage higher than...
The three-phase Inverter system using single phase grid line should combine the Inverter circuit with PFC(Power Factor Correction) circuit because of improving the Power Factor and Power Efficiency. In order to design the system at home appliance as a low-cost application, nowadays the non-isolated design is mainly used for this Inverter system. In this case, the wrong designed PCB produces an unwanted...
This paper proposed a compensation method for reducing sampling delay through ADC(Analog-to-Digital Converter) module of MCU(Micro Controller Unit) using ZDPWM method. In case of conventional PWM method of 3-level NPC inverter, the switching devices which is composed of silicon compounds are conducted complementary operation by both reference and carrier waveform. And this operating method needs to...
In this paper, a fast voltage strategy of three-phase AC/DC pulse width modulation (PWM) converter applying a feedforward compensation method is proposed. Conventional PI regulator control method and soft staring method are easy to generate inrush current from startup period. It leads to influence device's parts life, system reliability and increase the stresses on the switches. The paper analyzed...
IPMSM has advantage of high efficiency than other types of motors because of its high generating output per unit volume. However, when torque controlled in certain transient state, the transient response difference occurs due to difference of magnetic resistance. It means that difference of response on q-axis and d-axis currents, thus causing the motor control performance is reduced in transient....
In this paper, control method which detects positive-sequence voltage and phase angle is proposed for dc distribution system. Apart from positive-sequence voltage extraction using phase delay of APF, conventional control method needs phase angle detection using the PLL. On the other hand, control method applied in proposed system is able to perform phase angle detection, positive-sequence voltage...
In this paper, 3-level Active NPC inverter of predictive thermal modeling controls losses through the predictive thermal modeling. In the advantage of conventional 3-Level NPC, the generated thermal in each switch is unbalanced. Also, utilization of designed system has decreased. Thus, in order to compensate, 3-Level Active NPC inverter can distribute switch loss in accordance with operation of active...
In this paper proposed highly efficiency PSU(Power Supply Unit) for server power supply. To minimize power conversion loss, PFC(Power Factor Collection) circuit was designed into Bridgeless PFC using two switching components with 2 SiC diodes, and synchronous rectifier switching method was applied. An isolated DC/DC converter used LLC SRC(Series Resonance Converter) to increase power efficiency and...
This paper propose Zero Dead-time PWM method in 3-Level NPC(Neutral Point Clamped) inverter. Each switch of conventional PWM method is performs to complementary switching and semiconductor switch devices have time difference between rising time and falling time. Therefore, dead-time is applied to rising edge of switching signal for prevent short circuit fault. But this dead-time cause distortion of...
This paper proposes a phase current compensation method for a 3-Level NPC Dual Battery Pack charge/ discharge system. In this system, a DC link imbalance could cause distortion in the space vector diagram, which would cause distortion in the NPC phase current. The proposed compensation method eliminates this distortion. In this paper, the compensation method is proposed and verified by simulation.
This paper proposes Voltage-doubler Rectifier type Full-bridge converter for bipolar LVDC distribution system. This converter is possible of bi-directional power flow and perform DC_link voltage balancing operation. System of bipolar structure has neutral-point unlike unipolar structure. But, this neutral point is incur DC_Link voltage unbalance between top and bottom capacitor. Thus, bipolar structure...
This paper proposed a new SVPWM method with reducing switching state of the 3-level NPC inverter. This method can reduce the switching loss by using small number of switching state than conventional method. Also, it is possible to reduce difference temperature of inner and outer switches of NPC PWM inverter by maintaining negative or positive switching state of a phase. The proposed method is demonstrated...
In this paper, a new thermal modeling method is proposed for loss control method of 3-level Active NPC inverter. In the drawback of conventional 3-level NPC, the generated thermal in each switch is unbalanced. And utilization of designed system has decreased. In order to compensate, 3-level Active NPC inverter can distribute switch loss in accordance with operation of active switch. Therefore thermal...
In this paper, the proposed algorithm for output voltage balancing control of the dual full bridge converter with parallel input / series output. The proposed system is composed of using two voltage doubler full-bridge converters and half-bridge inverter. The proposed system is used for input voltage of half-bridge inverter. In this case, the fluctuation on the input capacitor voltage may be occurred...
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