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This paper describes voltage balancing of all the four split dc capacitors for a five-level diode-clamped PWM inverter intended for a transformerless mediumvoltage motor drive with a three-phase diode rectifier used as the front end. A dc-voltage-balancing circuit is installed on the dc link, and introduces a new midpoint-voltage-balancing method based on phase-shift control. As a result, the dc mean...
In this paper, a battery-integrated boost converter for module-based series connected photovoltaic (PV) system is analyzed. Each PV module has its own battery and DC/DC converter. The converter achieves maximum power point tracking (MPPT) and battery charging. Application of proposed converter to module-based series connected PV system can maintain string voltage and save an additional voltage amplification...
This paper proposes a novel soft-switching two-phase boost converter to behave as a power factor correction pre-regulator. This regulator is able to turn on both the active power switches at zero voltage to reduce their switching losses and evidently raise the conversion efficiency. The two boost converters are identical, and their operation analysis and design for the regulator become quite simple...
A novel high efficiency Current-Shared Photovoltaic Power System (CS-PPS), mainly constructed by the Maximum Power Point Tracking and Power Conditioning System (MPPT-PC), is proposed in this paper. The proposed MPPT-PC can track the MPPT and regulate the load energy condition at the same time for increasing the circuit efficiency and providing stable power to critical loads. A 200W prototype is designed...
This paper presents a parallel voltage controller to improve the output dynamic performance of a buck converter with Average Current Mode Control (ACMC). The parallel controller is a high-order controller synthesized from parallel connection of the two basic controllers. It is proposed to compensate the control-to-output transfer function of the converter, which has multiple poles and zeros. Up until...
In this paper, a novel adaptive control scheme for interleaved DC/DC power converters is proposed to improve the transient response to load current step inputs with high slew rate. The proposed adaptive control scheme is based upon gain scheduling scheme with pole-zero cancellation method to tune the parameters of the proportional-integral-derivative (PID) controller for efficiently improving the...
One of challenges in power conversion with conventional topologies is a large smoothing capacitor. This paper proposes a soft-switching boost DC to AC converter, which is a combination of a DC/AC converter and a pulse voltage generator working as a step-up chopper. The pulse generator generates high frequency pulse voltage from a low DC voltage with relatively small inductor and capacitor. The DC/AC...
This paper analyzes Proportional (P) and Proportional-Integral (PI) techniques applied to current loop controllers of single and three phase Pulse Width Modulated (PWM) Power Converters. Gain limits are derived for both strategies based on intuitive per unit values of the grid and power converter parameters. Tracking response and disturbance rejection performances of each controller in continuous...
A novel two-phase interleaved LLC resonant converter is proposed, which can manage the number of phases by output loading. In the proposed scheme, the output load current is detected with sensing resistor in the output terminal. The measured value is compared with the threshold value for phase management and the signal is generated to trigger the gate driver. As a result, it is possible to improve...
A current-balancing loop is often used in a voltage-mode multiphase interleaved voltage regulator (VR). It serves not only to balance the phase current but also to suppress the beat-frequency phase current oscillation in driving high-frequency dynamic loads such as recent central processing units (CPUs). In this paper, models were developed to predict the control characteristics of both the functions...
This paper presents a constant power controller for use in the DC-AC inverter of an electronic ballast for high-intensity-discharging (HID) lamps. The proposed DC-AC inversing stage is a high-frequency combined with low-frequency square-wave-driven half-bridge-type inverter with a constant lamp power control scheme; it supplies the HID lamp with low-frequency square-wave sources to avoid acoustic...
The control of DC/DC converters, topologies widely used in the active reduction of harmonic distortion for nonlinear single-phase equipment of low power, presents great challenges of design, due to the complexity of the mathematical model and its highly nonlinear dynamic characteristic. Techniques of artificial intelligence such as neuronal networks, suppose great improvements in the design and the...
This paper presents the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC), which is intended for installation on the 6.6-kV Japanese industrial and utility distribution systems without using line-frequency transformers. The converter is characterized by an arm structure based on the module consisting of cascade connection of multiple bidirectional PWM chopper-cells...
The paper presents the novel control system for a shunt active power filter (APF) connected to an electrical grid via LCL circuit. Such a circuit constitutes 3rd order low pass filter and almost completely attenuates current ripples from PWM, which are the major drawback of APF connected via inductors. Such a solution requires control that overcomes LCL resonance problem and, at the same time, maximizes...
This paper presents a high performance voltage regulation algorithm for a five-level current source inverter. The work combines linear voltage regulation concepts for a two level CSI, with an advanced modulation strategy that directly controls the intermediate link inductor currents of the 5-level converter. The voltage control loop is based around PI and PR stationary frame regulators, which achieve...
In this paper, a novel step-up converter is presented, where the charge pump concept, combined with the traditional boost converter structure, is utilized. Although two inductors are used in such a converter, the difference in value between the two inductors does not degrade the performance of this converter. Besides, the behavior of this converter is similar to the traditional boost converter, and...
This paper presents a new topology for a highly compact and highly efficient single-phase Power Factor Corrected (PFC) rectifier system. The new topology consists of several interleaved boost stages which operate in a mode called Triangular Current Mode (TCM) in order to simultaneously achieve a high power density as well as a high efficiency. Applying TCM, ZVS is achieved over the full mains period...
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