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Conventional model predictive power control (C-MPPC) requires a large amount of calculations, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper presents an efficient MPPC (E-MPPC) for three-level AC/DC converters by eliminating the complicated power predictions. As a result, the execute time and computational burden are reduced significantly...
This paper presents and analyzes experimentally an active microgrid architecture. The microgrid architecture is described and the employed control scheme reviewed, showing how the devised system is able to meet energy needs, ensure good power quality, and allow seamless transitions from grid-connected to islanded operation. Also, the proposed solution is briefly contextualized with respect to approaches...
PI controllers are frequently implemented in cascaded converter system to control the DC-link voltage, because they can achieve zero steady state error. However the PI controller adds a pole at the origin point and a zero on the left half plane, and it increases the control system type number, and then the system is more difficult to control. This paper proposed a DC-link control method for the two...
This paper presents a comparative study of direct power control (DPC) and model predictive control (MPC) for three-level neutral-point-clamped (NPC) AC/DC converters. The operating principle of DPC and MPC are introduced in detail, with focus on vector selection mechanism and suppression of neutral point voltage fluctuation. Special care is given to the avoidance of high voltage jumps in both phase...
This paper presents a simple and efficient power control method of a cycloconverter-type high frequency link converter for vehicle-to-grid applications in single-phase power systems. It includes a simple current reference generator for the purpose of P-Q control and islanding operation detection, a feedforward controller and a feedback controller. Since the proposed method employs trigonometric angles...
In this paper voltage source converters (VSCs) are being used in grid integrated power converters. For the mathematical model of PWM inverter under the d-q rotary coordinate system. This work has proposed a Microgrid power flow control under variable load and generation conditions. There exists coupling between the active current and reactive current, which makes it difficult to manipulate the power...
In this study, a flexible conveyance system driven by linear motors and hybrid magnets for magnetic levitation is proposed. For modelling purposes, nonlinear analytic models are derived and extended to 3 axis of movement and controlled with those nonlinear equations. For energy efficiency, each pole is controlled with voltage driving zero power levitation method. Since the system only has displacement...
The chief advantage of VSC based HVDC links over conventional HVDC is the controllability it offers on both the rectifier and inverter ends. The DC voltage, AC voltage, frequency, active and reactive power can be controlled on either side, which has been studied. Thereafter, stability analysis for the two- terminal VSC based HVDC transmission system is performed. For the integration of VSC based HVDC...
This paper presents a direct power control strategy for a doubly fed induction generator by using an artificial neural network controller with the multilayer perceptron structure. This controller generates the direct- and quadrature-axis rotor voltage signals from both the stator current and voltage that are measured by the Hall sensors. The input variables of the control system are the rotor speed,...
The voltage droop control concept is the most appropriate strategy to provide primary control in multiterminal VSC-HVDC (MTDC) transmission systems. However, due to voltage drops in the dc lines/cables, the primary power balancing is influenced by the dc grid topology and line resistances. This phenomenon is also evident when determining the secondary control strategy in MTDC systems. In this paper,...
Distributed control will play an important role in the shipboard power systems flexibility and will ensure the achievable system objectives. Distributed control has been widely used for low voltage DC microgrids. However, they are still limited to modeling the system for the power sharing solution instead of presenting an adequate configuration of distributed control in both power and energy control...
This paper investigates power control to regulate both inputs of dual-input DC/AC inverter independently. The dual-input DC/AC inverter topologies can be either neutral point clamp (NPC) or T-type three-level inverter. A mathematical model is established to derive the relationship between the dual-input power and the duty cycle of the DC/AC inverter. Then a control scheme is proposed to decouple the...
A proposed parallel power converter with interleaving algorithm is chosen to boost a low dc voltage of photovoltaic (PV) to a dc bus utility level and then follows by inverter. Converters are controlled by interleaved switching signals, which have the same switching frequency and the same phase shift. By virtue of paralleling the converters, the input current can be shared among the cells or phases,...
This paper presents a predictive current control strategy for Active Front End (AFE) rectifier supplying active and reactive power to the electric system during unsymmetrical voltage fault conditions without the use of a Phase Locked Loop (PLL) or Frequency Locked Loop (FLL). For a given active and reactive power and supply voltage, the strategy generates the required reference currents. A predictive...
This paper describes the modeling and simulation method and corresponding results of the Hydropower Plant (HPP) Tala, which is the largest existing plant in Bhutan with 6 units of 170 MW high pressure Pelton turbines and a complex control structure. The goal of the associated overall project is to create a complete dynamic model of the Bhutan power system for investigations concerning stability, island...
This paper explains the control techniques that have been applied to the 3-phase inverter for a grid connected system. The H∞ current control strategy with the Voltage Oriented Controller (VOC) with power control have been used together, in order to respond to the power required by the grid. The VOC control consists of a real and reactive power control with feedforward dc-voltage control. A simple...
In this paper is presented an off-line trained artificial neural network controller with multilayer perceptron topology. It is trained by a genetic algorithm and applied to the direct power control of a doubly-fed induction generator under stator voltage dip. This controller dispenses the use of any other in the control system, and to our knowledge it is not found in the technical publications that...
In this paper, a novel predictive direct power control (PDPC) strategy is proposed for three-phase AC/DC converters, which is based on a straightforward regulation of instantaneous active and reactive power. The converter controlled by the proposed strategy realizes operations without line-side voltage sensors by introducing the virtual flux (VF) concept and a grid voltage estimation method based...
Focus is on three operation strategies for a grid-connected three-level neutral-poi n t-clamped quasi impedance source inverter in a single-ph as e application. Each control scheme wa s implemented in the PS CAD/EMTDC simulation tool a n d underwent different tests, which involved some steps in the reference values and in the perturbations applied to the system. A comparison according to their responses...
Development of control strategies for grid connected power converters is a fundamental aspect for applications such as integration of renewable energy sources, motor drives and energy storage systems. Hence, this topic has received significant attention from both academic and industry researchers. This paper presents the use of the Reduced Optimal Switching Sequence Direct Power Control (ROSS-DPC)...
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