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In order to suppress harmonics and optimize power grid quality for the indirect matrix converter (IMC), harmonic characteristics of the input current in IMC are analyzed. The classic dual space vector modulation (SVM) method is adopted for IMC. Generally, only the rough results of harmonic analysis can be achieved by using the conventional mathematical model based on the transfer function. In this...
In modern electric traction drives, on-line monitoring offers the advantage to decrease maintenance cost and increase the reliability. Especially, the electrical insulation is one of the most vulnerable components of an ac machine. Fast switching of the inverter results in high output voltage slew rates increasing the stress on the insulation as well as the rate of deterioration. The described stator...
CCAMY systems in partnership with Lille University currently develops Emulatio: a simulation and diagnosis platform for multi-physic systems, using Hybrid Bond Graph. This platform is devoted to automatically build model of industrial Computer-Aided Design schematics, then generate Block-Diagrams for simulation and export Global Analytical Redundancy Relations for model-diagnosis. For this task, a...
This work provides the guidelines to calculate the size of the DC-link capacitor to contribute with additional energy - for a short period of time - than the photovoltaic panel can supply under normal operating conditions. First, a model of a three-phase electric generation system is used that combines photovoltaic panels and an inverter with an LCL filter at network side. In addition, a control algorithm...
This paper presents prediction of voltage flicker (Short Term Flicker and Long Term Flicker) on Grid Connected Photovoltaic (GCPV) power system towards Malaysia climate variations (solar irradiance) by using Mathematical model. The actual and prediction data measurement were analyzed under three different types of GCPV systems that installed in Green Energy Research Centre (GERC), University of Technology...
On-site small-scale electricity generation through a cluster of micro-sources with their local loads known as, microgrid has attracted significant attention as an alternative to traditional centralized power generation plants. The advantage of microgrid lies in its capability to work in stand-alone (island) and grid-connected mode. During the transition from grid-connected mode to island mode, there...
The efficiency-oriented control strategies are very important to obtain high-efficiency performance of permanentmagnet synchronous motor (PMSM) drive systems. This paper proposes a novel analytic system loss model of PMSM drive system which can consider about both losses of PMSM and power converter losses. The losses of PMSM consist of two parts: stator iron losses and stator copper losses which...
In this paper, an advanced droop control using a multinomial model for operating the parallel-connected uninterruptible power supply (UPS) inverters is proposed. To control the parallel inverters without any physical communications, the control method using a P/Q droops is conventionally used. The conventional method droops voltage and frequency using the monomial model. In conventional droop control,...
This paper presents predictive control for single phase multi-module UPS inverters with output LC filter modeling. In the previously proposed current predictive control, it has finite dynamic response of transient time by voltage PI control. To complement this problem, voltage and current predictive control are proposed to substitute voltage PI control with output LC filter modeling. Multi-module...
Conventional grid-interconnected inverters for variable-speed wind turbines cannot provide synchronous power as they do not have inertia. This paper proposes an application of model following controlled (MFC) PWM inverter to grid-connected variable-speed wind generators, which is based on the parallel-connected two-generator model. The wind generator system controlled by the proposed grid connected...
This paper presents the design and implementation of a high speed sensorless brushless DC motor (BLDCM) drive with commutation compensation. The back electromotive force (EMF) detection using three phase terminal voltage is implemented to detect the rotor position, in order to filter the high frequency switching signals, a low pass filter is applied in the back EMF detection circuits, the cut-off...
We are considering the problem of controlling a single-phase Multicellular inverter with LC output filter. The control objectives are: (i) generating a sinusoidal voltage with amplitude and industrial frequency fixed by the reference signal, (ii) ensuring a good convergence of the voltages across the flying capacitors. The controller is designed using the backstepping approach in its adaptive versions...
In view of power electronic devices need to handle higher voltage grade and capacity grade, multilevel converter has become the key to solve the problem. Cascaded inverter type is widely used because of the low harmonic pollution, high input power factor, as well as good output waveform. This paper adopts the method of model design to study the five-level inverter PWM control method systematically,...
This paper introduces a mathematical model for VSC-HVDC transmission link with two non-linear control strategies, namely Sliding Mode Control (SMC) and Integral Sliding Mode Control (ISMC). Sliding mode control is invariably used to address control problems in non-linear systems. The main drawback of sliding mode based approach is chattering. To reduce chattering and to minimize the steady state error...
The shortage of energy and the deterioration of the environment have become increasingly prominent. A large number of distributed generation access to distribution network, network structure changes. Because of the fast response characteristic of the inverter interfaced distribution generation (IIDG), the instantaneous current protection of distribution network appears to be wrong or refused to move...
This paper based on the commutation mechanism of series capacitor commutated converter (CCC), the CCC is applied to UHVDC transmission system, and the mathematical model of reactive power demand of CCC inverter is established. According to the actual parameters of Jiuquan-Hunan ±800 kV UHVDC transmission project, the simulation model of CCC- UHVDC system is built by PSCAD/EMTDC simulation software...
Renewable Energy Sources, especially solar energy, are important in mitigating environmental problems. Following, a step-by-step modeling of a photovoltaic (PV) system that can be connected to the grid through converters is achieved. The proposed mathematical model is implemented in MATLAB/ Simulink. A maximum power point tracking (MPPT) algorithm finds the maximum power for the operation of the PV...
Because of the inherent defects of the traditional High-Voltage Direct Current (HVDC ) transmission systems, this paper proposes a control method of flexible HVDC transmission system based on shuffled frog leaping algorithm(SFLA), which will improve the anti-interference ability of the power system by optimizing active disturbance rejection controller(ADRC).
This paper presents an analysis of the optimal reactive power of distributed generators (DGs) in distribution networks for improving the energy efficiency. In recent years, the increasing awareness of the pollution problem, social issues, and economic factors have rapidly increased the penetration of DGs in the distribution networks. Because of the smart inverter technology, the reactive power of...
This paper is based on the performance of the Brushless Direct Current Motor (BLDCM) centrifugal pump set fed by wide input voltage solar photovoltaic (PV) generator using Quasi Z Source Inverter (QZSI). The aim of this paper is to develop water pumping control loops enabling the system load line operating point to track and match that of the centrifugal pump best efficiency point (BEP) along the...
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