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The Z-source concept has many advantages it can be applied for any type of power conditioning system this paper propose a Z-source based three level inverter system for the photo-voltaic array or system. A comparison of traditional system and new Z source three level inverter configuration is performed. In this paper present the SPWM technique for controlling the neutral clamped three level inverter...
The nonlinearities of the load current in power systems are increasing with the growing number of electronic devices with rectifiers at the front end of their power supply. Therefore designing an inverter that can overcome these nonlinearities in the output current and generate an AC output voltage within the desired Total Harmonic Distortion (THD) level is critical to meeting the power quality requirements...
This paper presents a PID controller for dc-link voltage in the single-phase switched-boost inverter (SBI). Unlike the dc-link voltage controller in the Z-source inverter (ZSI), the presented controller can be directly controlled via the capacitor voltage. By using this controller, a constant capacitor voltage can be achieved when the input voltage or the load are changed suddenly. A 200-W prototype...
In this paper, Active and Reactive power management with the utility grid is achieved by integrating 7-level quasi Impedance Source Inverter (qZSI) with Thyristor based elements (Thyristor Switched Capacitor (TSC) and Thyristor Switched Reactor (TSR)). Major portion of the reactive power is managed by the thyristor based elements and the remaining reactive power is managed by the cascaded qZSI. The...
This paper proposes a direct model predictive control (MPC) strategy to control the bidirectional quasi-Z-source inverter (BqZSI) driving a permanent magnet synchronous machine (PMSM) for electric vehicle applications. The dq machine currents are simultaneously controlled with the capacitor voltage and inductor current of the dc side. The physical model of the BqZSI with PMSM is first derived which...
The paper presents SiC-based three-level T-type modules designed for a high-performance 30kVA DC/AC inverter operating at high frequency 85 kHz with low THD of the output voltage. This inverter system consists of two integrated parts. The first part is active and contains three parallel-connected three-phase T-type modules built with fast-switching SiC power transistors. The second, passive part of...
This paper proposes an optimised design approach for Multi-Modular (M-M), single-phase UPS inverters system. The Voltage Source Inverters (VSIs) have low output impedance for good voltage regulation, which conflict with the requirement of high impedance in the parallel configuration to restrain Inter-Modular (I-M) circulating currents. Conventional dual-loop approach of Proportional-Resonant (PR)...
Single Phase micro-inverters have become very popular in grid connected residential PV systems due to their modular structure, plug-and-play attribute and control flexibility. These inverters are geared with power decoupling capability to suppress the reflection of pulsating output power on PV outputs. This paper presents a novel single stage buck-boost derived PV micro-inverter focusing on use of...
This paper presents the dynamic performance analysis of grid connected Z-source inverter (ZSI) based distributed generation (DG). ZSI provides a single stage buck boost conversion which reduces the switching losses and becomes an economical option for DG systems. The standards set by the utility is met by the ZSI even during variable input conditions by regulation of shoot through duty ratio. The...
The current control techniques on ARP (Auxiliary Rescue Power) for elevator system are presented in this paper. The purpose of this system is to assure the safety of the passengers by using electric power stored in a battery during power outage. The conventional current controller used in converter and inverter are Proportional-Integral control and dead-beat control which require complex coordinate...
This paper proposes a single-bit ADC system based Proportional and Integral (PI) controller to regulate the output voltage of Capacitive Power Transfer (CPT) systems. A simple single-bit ADC system i.e., Single-Bit Modulator (SBM) is considered as an alternative to the commonly used multi-bit ADC systems. Unique features of employing SBM are 1) its ability to convert analog signals into single-bit...
By utilizing an inherently symmetrical differential structure, several boost DC/DC converters can be used to construct a multi input DC/DC or DC/AC converter. The use of integral state feedback based pole placement control strategy has been reported in the literature to control this type of converter. However, this control method is based on the small signal model of the circuit and highly dependent...
This paper proposes a compact topology for an integrated PV and energy storage system based on three boost converters and one bidirectional buck-boost converter. One of the boost converters is used for MPPT control, and the other two boost converters are used to implement a boost inverter that can generate sinusoidal waveform. A bidirectional buck-boost converter, to charge and discharge the energy...
This paper proposes a Discontinuous current mode (DCM) feedback current control for the grid-connected inverter in order to achieve the low THD of the grid current at wide load range. In the DCM operation, the nonlinearity between the duty ratio and the current occurs in the current command response, whereas another nonlinearity between the disturbance voltage and the current occurs in the disturbance...
An input-parallel output-series full-bridge DC/AC converter for on-board Electric Vehicle (EV) charger is proposed in this paper with the merits that low input current ripple and output voltage ripple. It can also decrease the current stress on the primary side devices and voltage stress on secondary side devices. This proposed DC/AC converter interleaves two isolated full-bridge converters with parallel...
In order to regulate the dc-link voltage and achieve the bidirectional power flow capability, a traction driving system with bidirectional quasi-Z-source inverter (BQ-ZSI) for electric vehicles (EV) is proposed in this paper. Based on analyzing the circuit structure and small signal model, oscillation of the dc-link voltage of BQ-ZSI could be caused when the disturbances on dc input voltage occur...
In this paper, a novel open winding PMSM system for electric vehicles (EV) is proposed, which is collaboratively supplied by the bidirectional Z-source and voltage source converters. By employing the Z-source converter into the traditional open winding PMSM system, the constraint of the fixed dc bus voltage can be broken through, and the electric vehicles can achieve a large speed range without the...
The buck-boost inverter can be easily used to construct a multi-input converter due to its inherent symmetrical and extendable differential structure. This paper proposed a multi-input converter derived from the buck-boost inverter to interface different input sources. When two pure DC voltages are chosen as the references for the two output capacitor voltages, the proposed converter will operate...
This paper presents a direct model predictive control (MPC) strategy for the quasi-Z-source inverter connected to a linear/nonlinear load via an intermediate LC filter. The proposed scheme simultaneously controls the ac-side output voltage and the dc-side capacitor voltage and inductor current. The discrete-time model of the converter is derived which can be used for both modes of operations, namely...
Integrating the functionality of battery charging into the propulsion and accessory power system in a plug-in electric vehicle (PEV) can significantly reduce the component count, and thus the cost, weight, and volume for the onboard charger (OBC). Replacing silicon (Si) based power devices with wide-band-gap (WBG) devices can further increase the power density and efficiency and lower the cost as...
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