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This paper provides an overview of DC side fault tolerance issues of VSC based HVDC system and the need for fault tolerant converters. The working principle and DC fault ride through capability of recently introduced Alternate Arm Modular Multilevel Converter(AAMMC) has been discussed. The capacitor voltage balancing issues of AAMMC is analyzed and a novel scheme for balancing capacitor voltages of...
An energy autonomous system is required to supply power to remote areas or islands. This paper presents a control strategy for a large-scale Proton Exchange Membrane Fuel Cell (PEMFC) system used in a stand-alone application. The studied system consists of the dynamic model of a PEMFC that has been validated with experimental data, a dc/dc boost converter, a dc/ac Voltage-Source Converter (VSC) and...
The matrix converter (MC) is an attractive topology for the more electric aircraft because of its high-power density and bidirectional power flow features. One of the challenging issues in MC is the current commutation. The commutation process in a matrix converter (MC) is more complex as compared with that of the traditional AC-DC-AC converter due to the lack of natural free-wheeling paths. Multi-step...
The voltage regulation for stand-alone three-phase single-stage boost inverter (SSBI) is presented in this paper. In three-phase SSBI, the voltage regulation is achieved by adjusting the boost ratio. The SSBI has been simulated for a wide range of input dc voltages and load levels. Moreover, the performance a 2kW 208/230V laboratory-scale three phase boost inverter is presented for both linear and...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
Electric-drive vehicles, including hybrid (HEV), plug-in hybrid (PHEV) and electric vehicles (EV), require a high-voltage (HV) battery pack for propulsion, and a low-voltage (LV) dc bus for auxiliary loads. This paper presents an architecture that uses modular dc-dc bypass converters to perform active battery cell balancing and to supply current to auxiliary loads, eliminating the need for a separate...
The paper presents a Maximum Power Point Tracking (MPPT) controller for a multi-channel (N-Channel) Photovoltaic (PV) solar system which requires only one voltage sensor and no current sensors. The N-channel Load Voltage Single-Sensor MPPT (LV-SS-MPPT) controller is able to track the MPP of each solar panel using only one output voltage value in the N-channels and is able to provide a very good tradeoff...
With the development of smart grid, a large amount of monitor equipment is employed to supervise the condition of power cable. Because of its convenience, extracting electric energy from cable via a current transformer is a promising technique used in power supply for these pieces of monitoring equipment. In this paper, an enhanced energy harvesting method based on current transformer in resonant...
Photovoltaic (PV) system with multi-strings can be efficiently operated since individual maximum power point tracking (MPPT) of each separated panel is performed by converters which are connected to each panel. For the MPPT, it causes continuous switching losses of the converters. This paper proposes new control operating method in multi-string PV system using parallel DC/DC converters and single...
This paper concentrates on the load disturbance in three-phase voltage source inverter with an output transformer. The transformer could be smaller when placed behind the LC filter. But the voltage drop on the leakage impedance of transformer may destroy the quality of output voltage. Output current feedforward control is proposed to eliminate the influence of load disturbance. The distinct features...
In this paper, a novel approach to determine the small signal model of an LLC resonant converter is presented. The proposed model uses analysis techniques from communications theory to determine the control-to-output transfer function required for the design of a digital compensation network. The model considers the effects of higher order harmonics and sideband frequencies generated by the variable...
A new discrete time state feedback controller is presented, which allows high bandwidth voltage control of a buck converter for any load condition whether it operates in discontinuous conduction mode (DCM), continuous conduction mode (CCM) or in the boundary of these regions. This makes the buck converter applicable for a wide range of applications. For the control design process two large signal...
This paper proposes an optimization method to design the parameters of controls for power converters in order to achieve a very fast dynamic response while remaining stable and robust over the desired operation region. The proposed optimization algorithm is applied to different analog controls and is used to compare the dynamic response of the Voltage mode, V2 and V2Ic control for different cases...
This paper proposes a novel control scheme for a stand-alone PV application. A two power stage approach has been used that consists of a front end high gain DC-DC converter followed by a 3φ H-bridge inverter. A general reactive load has been considered. The control scheme uses abc to dq reference frame transformation. The active power demand is controlled by regulating the dc link voltage. Reactive...
Smart Power ICs are Power Switches with integrated control and protection functions for the switching of middle and high current loads in industrial and automotive applications. Due to customer specifications and electromagnetic compatibility requirements it is often desired to limit the current and voltage slew rate at the output terminal of the Smart Power IC by minimizing the switching losses at...
This paper describes a constant on-time controlled DC-DC converter that realizes both high efficiency under light loads and fast load transient response. To realize low-power operation, a combination of a simple common-source amplifier and a low-power differential amplifier is used instead of a differential comparator. Using a common-source amplifier cuts power consumption in half compared with using...
Droop control and some improved droop control methods are adopted to control microgrid inverters not only in island mode, but also in grid-connected mode. This paper presents a state space model of three phase paralleled inverters in grid-connected microgrid based on droop control to facilitate the control design and stability analysis. This model is established in rotation framework based on modern...
The PWM-controlled Voltage Source Converters (VSCs) are commonly used in industrial and utility applications. In spite of superior features of fast voltage regulation and stable DC-link voltage, PWM-controlled VSCs have the major drawback of being sensitive to the grid disturbances especially the unbalanced conditions and system faults. Unbalanced input voltage generates large negative sequence current...
In radiator thermostat applications, DEAP (Dielectric Electro Active Polymer) actuator tends to be a good candidate to replace the conventional self-actuating or step motor based actuator due to its intrinsic advantages. The capacitive property and high voltage (HV) driving demand of DEAP actuator make a high voltage capacitive load driving system to be necessary. The only energy source battery determines...
In this paper, a plug-in electric vehicle battery charger is proposed based on SEPIC PFC and LLC topologies. In addition, a new approach in introduced to actively control the dc link voltage and track the maximum efficiency point of a LLC converter over the wide voltage range of the high voltage battery pack. Comprehensive circuit modeling and loss analysis at maximum efficiency point of LLC converter...
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