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In order to strengthen the framework structure of distribution network, promote the agility of its control methods, and improve its intelligent and automation level, Soft Normally-Open Point (SNOP) as a novel power electronic device is installed in distribution network, which can provide accurate control of real and reactive power flow. This paper proposed the dynamic mathematical model of three-port...
The modular multilevel converter (MMC) is a highly efficient multilevel converter topology suitable for high and medium voltage applications. However, one of the negative traits of MMC is the existence of circulating current. The detrimental effects of circulating currents include distortion in arm voltages, converter power loss and high switching stresses on semiconductor devices. This paper aims...
This paper presents a new control method for a Modular Multilevel Converter (MMC) fed by a push-pull converter via a medium frequency (MF) transformer. Application of this topology is a universal high-precision 3AC voltage source for a Power Hardware-in-the-Loop Emulator with a frequency range from DC up to almost the medium frequency. Advantages are high efficiency, very low harmonic distortion and...
A modular multilevel converter control system, based on converter energy storage, is proposed in this paper for two different control modes: active power and dc voltage. The proposed control system decouples the submodule (SM) capacitor voltages from the dc bus voltage. One of the practical applications is the management of active redundant SMs. A practical HVDC system with 401-level MMCs, including...
The photovoltaic (PV) stand-alone system requires a battery charger for energy storage. This paper presents the modelling and control design of the PV charger system using Buck-Boost converter. The voltage command is determined by both the PV module maximum power point tracking (MPPT) control loop and the battery charging loop. Here the controller is designed so as to balance the power flow from PV...
A scalable predictive controller is proposed for coordinating multiple Shunt Switching Compensators (SSCs) to serve flexible compensation objectives while minimizing the power losses. A strategy utilizing Current Physical Component (CPC) theory and Recursive Discrete Fourier Transformation is used to orthogonally decompose the SSC reference currents into individual physical components. These components...
In grid-connected Photovoltaic (PV) applications, DC-links based on large electrolytic capacitors are used to attenuate voltage oscillations caused by the sinusoidal power injection into the grid, where the electrolytic capacitors introduce reliability problems. This paper proposes the unified modeling of the complete PV system in typical grid-connected operation conditions to design control strategies...
An adaptive fuzzy sliding-mode (AFSM) control system is developed to control parallel DC-DC boost converters. The AFSM control system that combines a fuzzy adaptation technique with sliding mode control to enhance robustness and sliding performance in a class of uncertain multi-input multi-output (MIMO) nonlinear systems is proposed. Using an online adaptation scheme, a fuzzy sliding mode controller...
Modular Multilevel Converters (MMCs) are a new circuit topology to realize multilevel converters. Major advantages of MMCs in comparison to other multilevel converters or standard Voltage Source Converters (VSCs) are lower costs and a modular design for high voltage applications, higher reliability and longer maintenance intervals. However, modular multilevel topologies generally require advanced...
This paper presents the comparison between PEM fuel cell and gas turbine. THE dynamic model of PEM fuel cell and gas turbine will be described. To control of voltage and frequency, control loop added to the PEM fuel cell model. For the gas turbine speed control loop added to its model. Dynamic model are used to determine response of PEM fuel cell and gas turbine to variation load. The results are...
In this paper analysis and design of deadbeat current control for the coupled inductor boost dc-dc converter is proposed. With the help of state-space technique, mathematical models are formulated, and then the discrete compensator designed using deadbeat control theory. Salient features of the coupled inductor topology are compared with the conventional boost topology. The compensator design is validated...
This paper proposes a new voltage regulator of the DC-bus capacitor of a variable speed wind energy conversion system based on an adaptive fuzzy system. The change in the fuzzy rule base is done using a variable-structure direct adaptive control algorithm to achieve the pre-defined control objectives. This algorithm has two merits. First, it has a good performance in the training phase as it makes...
This paper presents an innovative control law for a distributed dc generation supplied by fuel cell (FC) generator. Basically, an FC is always connected with a power electronic converter. This kind of system is non-linear behavior. Classically, to control the voltage, the current or the power in the converter, linearized technique is often used to study the stability and to select the controller parameters...
This paper presents the design considerations and the implementation of a cd-cd buck-boost converte, which can process the energy transferred from the ultra capacitors (UC) bank and batteries to the load (motor drive system of an Electric Vehicle EV). The UC bank is used as auxiliary source to supply the motor drive system which allows recovering the energy generated during the regenerative breaking;...
This paper deals with the holistic modeling approach of a combined Photovoltaic, Wind and Fuel Cell power system. The method is using the DK5 modeling/design environment from Mentor Graphics and is based on the new Handel-C programming language. The goal of the work carried out was to achieve an optimized holistic digital control system design, followed by its rapid prototyping into a single Field...
The design of a Single Inductor Dual Output (SIDO) buck converter using two individual voltage mode control loops has been presented in this paper, and the limitation of using such control method has been indicated, then the control schemes for minimizing the cross regulation issue has been discussed. By using two separate control loops, the inductor energy is shared and regulated for both output...
Compared to L-type filter, LCL-type filter have resonance frequency point, consequently reduce the reliability of the VSC converter. The general control strategy with passive damping or active damping can improve the stability of the converter, but it will bring extra loss, and need more sensors. This paper compare and analysis the performance of LCL converter controller with different feedback variables...
This paper presents a stand-alone photovoltaic system with Ni-MH battery serving as its energy storage element. The proposed system is composed of a boost converter, a bidirectional dc-dc converter and a single-phase dc-ac inverter. The boost converter is used to track the maximum power point of the solar panel whereas the bidirectional dc-dc converter is applied to maintain the dc-link voltage stable...
This paper presents Boost Converter Control strategy for a three-phase four-leg Active Power Filter (APF). In the proposed control method, voltage source model is established for APF system, and the compensation of system current is equivalent to the compensation of the proposed voltage source. This method explains the working principles of the Voltage Source Inverter (VSI) on current compensation...
Multi-input dc-dc power electronic converters have been gaining popularity in applications such as renewable energy sources and electric-drive vehicles due to their reduced part count and flexibility in integration. In this paper, the small-signal model of the double-input buckboost converter is developed. The model is then used for a multiple loop feedback design. Considering a photovoltaic-battery...
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