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The power factor and total harmonic distortion (THD) are important considerations when designing an output filter. In the case of the photovoltaic (PV) ac-module, the size and weight also have to be taken into consideration. This paper proposes an output filter to reduce size and weight, and provides the optimal design method for a PV ac-module. The proposed output filter consists mainly of a conventional...
In this paper, ozone power supply which consists of single-phase inverter, high-voltage step-up transformer, resonant reactor is presented. Also equivalent circuit which simulates the real discharge tube is presented. And PWM (Pulse Width Modulation) control method mixed with PDM (Pulse Density Modulation) control method is proposed for controlling the discharge power. Proposed autotuning freqeuncy...
In the photovoltaic (PV) AC-module system, the system size and weight are important design factors because AC-modules are installed to each PV panels. Since the most of harmonics occur at multiples of switching frequency, the harmonic elimination at switching frequency can be an effective technique for reducing the total filter size. To decrease output filter size, proposed output filter consists...
In this paper, energy storage system(ESS) operation algorithm for economics considering battery degradation properties is proposed. Hourly electricity charge according to real-time pricing (RTP) and battery properties are analyzed for high profit through ESS operation. Especially, hourly electricity charge of Illinois State is analyzed. Characteristics of battery accounts for a high percentage of...
In this paper, interpolation error compensation method for look-up table(LUT) based IPMSM(Interior Permanent Magnet Synchronous Motor) drive is proposed. Generally, the LUT based IPMSM drive is widely used on automotive application because of its reliable current control. However, the LUT data is memorized discreetly, so the linear interpolation method is used for the absent data condition. Because...
3-Level Neutral Point Clamped (NPC) Inverter has 4 switches in each leg. 2 pairs of switches of the inverter operate complimentarily, S1 and S3 is a pair, the other is S2 and S4. But short circuit fault can be occurred due to a time distinction of turning on/off the switch. Thus, short circuit fault can be prevented by giving dead-time when turning on the switches which complementarily operate mutually...
This paper proposes parallel control method using droop control when each other 3-phase AC/DC converter connected. DC distribution system need parallel operation for increase the single-capacity because of the capacity restriction of power semiconductors. But, circulating current make low electric power quality when parallel operational occurrences. This system apply 50[kW] DC distribution using the...
In this paper, integrated parallel operation is proposed for the DC distribution System combined renewable power generation system. Proposed DC distribution system is composed by two AC/DC power converter modules, one photovoltaic power module and one ESS(Energy Storage System) module and that analyses six mode of operation. Proposed system operation is controlled by power control. Then, system configuration...
In this paper, the improved predictive current control for shunt active power filter(SAPF) is proposed. To reduce the overshoot phenomenon of the input current caused by the delay element, the current predictive control is applied. But, the conventional predictive current control includes the problem that reduces harmonic removal performance and dynamic performance because it generates reference current...
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...
This paper deals with stand-alone type fuel cell hybrid generation system which contains a secondary cell. The stand-alone type fuel cell hybrid generating system consists of a full bridge converter and boost converter with secondary cell. Additionally, the system includes BOP(Balance of Plant) for running the cell and a reformer in order to stably supply a hydrogen. Also, this paper proposes operation...
The paper is proposed total operation of a power conversion system for a Hybrid ESS. The system is formed with a photovoltaic energy system, ESS and system PCS to supply stable power. The conversion system utilized in the photovoltaic and ESS is formed with a parallel module in consideration of system characteristics. The paper describes the control method applied in the power conversion system and...
In the EV system operating regenerative mode without bi-directional DC-DC converter, 3-phase PWM inverter should charge the battery. At this time, regenerative torque reference for braking has to output torque reference in order to charge the battery. This paper proposed the regenerative control method controlling the voltage and current of battery through the regenerative power control at regenerative...
In this paper, Energy storage system(ESS) operation algorithm for economics considering battery degradation properties is proposed. Hourly electricity charge according to real-time pricing (RTP) and battery properties are analyzed for high profit through ESS operation. Especially, hourly electricity charge of Illinois State is analyzed. Characteristics of battery accounts for a high percentage of...
In this paper, the uninterruptible power supply(UPS) mode transfer method of three-phase energy storage system (ESS) using the silicon-controlled rectifier(SCR) is applied. In the three-phase ESS using the SCR, the three-phase grid is not blocked because each-phase has a difference of 120 degree. Therefore, the ESS needs the UPS transfer method which is blocking the three-phase grid at the same time...
In this paper, battery balancing algorithm for serial multi-module UPS system is proposed. The battery balancing algorithm is performed by the output power control of each UPS modules for eliminating SOC difference of batteries respectively. So, the coulomb counting method is used to estimate SOC of the batteries. The reference is compensated with SOC difference and according to magnitude order of...
A current sharing method considering battery state of charge(SOC) for single phase uninterruptable power supply(UPS) module is proposed. Each of UPS module system is consists of single master and multi slave modules. A master module performs output voltage control and current sharing algorithm considering the battery SOC of each of the UPS modules. In current sharing algorithm, current commands are...
Conventional dual half-bridge converter has been previously shown to have advantages in low voltage and high current input applications. This characteristic is suited to photovoltaic application or battery application likes energy storage system (ESS) or uninterruptible power supply (UPS). However, conventional dual half-bridge converter cannot charge the battery because the power flow is one-way...
In this paper, power control method is proposed when power converters are configured in parallel for increasing power capacity. Each module and load is transformed by equivalent circuit model. And power is controlled through the equation. Power control method can be controlled power of each module and reduced circulate current. Proposed power control method is applied to power converter modules for...
FCEV (Fuel cell electric vehicle) is provided with energy for operating the motor from the fuel cell. But fuel cell is impossible to be charged at the regenerative mode and also, it has slow dynamic characteristics. So, additional battery is essential as an auxiliary power source in FCEV system. The output current of the VSI (Voltage Source Inverter) is distorted due to the dead-time and the delay...
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