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Virtual Synchronous Generator (VSG) is an inverter control structure that supports power system stability by imitating a synchronous machine. Because of the limitation in inverter power and current, their operation under disturbances should be evaluated and enhanced. In this paper, the VSG unit response to different types of faults at grid side is assessed. Besides, a theoretical analysis that traces...
This paper presents a modular push-pull PWM converter (MPC) for a battery energy storage system, which is intended for grid connections to medium- or high-voltage power systems. The converter per phase consists of a center-tapped transformer and two arms based on a cascade connection of multiple bidirectional PWM chopper cells with floating dc capacitors. This paper proposes a new control method for...
Permanent magnet synchronous motors have been widely used due to their high performance and high efficiency. In this paper, we talk about the control of a 750kW permanent magnet synchronous generator which is used for a hybrid turbocharger for a marine application. The controller outputs regulated 700V dc bus voltage with a voltage variation of less than 5% under 100% load transient condition to ensure...
This paper deals with a new technology called Hardware-In-the-Loop (HIL) simulation. It is a method by which a simulation is carried out in real time (RT). In this system, a real product (Inverter) is used as a controller instead of a software-based controller; the power circuit, induction motor and machine (crane) are all modeled and loaded into an RT simulator. In this HIL simulation, the motor...
Output current of general inverter is controlled based on the information of current sensors which are placed on the output. However, these sensor outputs have gain error and offset which are depending on the peripheral components and the accuracy characteristics of current sensor. Current control performance can be deteriorated a control method which uses a periodic disturbance observer to suppress...
This paper deals with methods for parameter estimation of two-mass mechanical systems in electric drives. Estimates of mechanical parameters are needed in the startup of a drive for automatic tuning of model-based speed and position controllers. A discrete-time output error (OE) model is applied to parameter estimation. The resulting pulse-transfer function is transformed into a continuous-time transfer...
This paper describes design guideline on optimized on-off switching control to improve overall power conversion efficiency of paralleled converter system. The optimized on-off control changes the number of active modules according to load current. Key point of the control is to determine the on-off points of converter modules. Design guideline on determining optimized switching points is shown by...
This paper deals with real-time simulation of a self-commutated static var compensator (SVC) system for steel plants with electric arc furnaces (EAFs). A voltage flicker often occurs due to the unsteady current and changes in reactive power. Simulation of the flicker suppression system is quite complicated, and new simulation techniques should be developed. We constructed a main circuit and control...
Dynamic and steady-state behavior of a paralleling three-phase AC-to-DC converter with reduced dc bus capacitor and nearly unity power factor is investigated in this paper. The circuit is simulated and the simulation results are analyzed and verified by measurements. A 1.5 kW laboratory prototype with small dc bus capacitance 690 µF (0.46 µF /W) is implemented and tested to verify the feasibility...
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