Simulation and Implementation of Power Control Strategy Grid Connected Photovoltaic System (original) (raw)
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Novel deadbeat power control strategy for grid connected systems
Journal of Electrical Systems and Information Technology, 2015
This paper introduces a novel approach for power control of three phase voltage source inverter (VSI) in grid connected distribution generation system. In this approach, the control of active and reactive power is based on deadbeat control strategy. First, the difference between the reference and actual currents are introduced in different approach. Then current to power substitutions are carried out to obtain direct relationship between the required inverter voltage and instantaneous power errors. There is no need for coordinate transformation or PLL, where the required inverter voltage vector calculations carried out in α-β stationary reference frame. The proposed technique introduces two cross coupling components in the control function. Including these two components, the controller can achieve nearly zero steady-state tracking error of the controlled variables. To obtain fixed switching frequency operations, space vector modulation (SVM) is used to synthesize the required inverter voltage vector and to generate the switching pulses for the VSI. The proposed strategy has the simplicity of the direct power control (DPC) technique and doesn't require any current control loops. The proposed strategy is experimentally implemented using fixed-point microcontroller. Simulation and experimental results are presented to confirm the superiority of the proposed strategy.
CONTROL AND ANALYSIS OF GRID-CONNECTED PV SYSTEM USING CURRENT CONTROL TECHNIQUES OF INVERTER
IJARW, 2022
Solar photovoltaic is one of the most promising renewable energy sources that converts solar energy into electricity in an environmentally friendly way. However, the efficiency is low and the relative costs are high. To overcome these drawbacks, a grid-connected photovoltaic system must be required to meet the load demand. In this paper, the analysis and simulation of a single-stage grid-connected photovoltaic system using the hybrid inverter and its control methods for implementing DC to AC power conversion are presented. The design of a single-stage grid-connected photovoltaic system by modeling and simulation of hybrid inverters is carried out in the MATLAB-Simulink environment. A fixed DC i/p voltage is supplied using the PV module to the hybrid inverter and a controlled AC o/p power is obtained by adjusting the value of Id and Iq, thus varying the on/off periods of the l hybrid inverter. components.investor. The hybrid inverter used in this article features a single-phase version of SSI with enhancements to the PWM inverter topology. the fundamental frequency to raise the input source voltage into the intermediate circuit voltage. In this inverter, one of the full-bridge arms is subject to a constant duty cycle change, while the other is subject to a sinusoidal variable duty cycle change. The variation of the duty cycle is obtained using a pulse width modulation [PWM] generator block. Therefore, by varying the value of Id and Iq, the active and reactive o/p power can be proscribed using the decoupled current control method in the hybrid inverter.
International Transactions on Electrical Energy Systems, 2023
A direct power control (DPC) approach is proposed in this study for a grid-tied photovoltaic (PV) voltage source inverter (VSI) to regulate active and reactive power fow directly in between utility grid and microgrid (MG) by controlling point of common coupling (PCC) voltage. Te proposed PCC voltage modulated (PVM) theory-based DPC method (PVMT-DPC) is composed of nonlinear PVM, nonlinear damping, conventional feedforward, and feedback PI controllers. For grid synchronization rather than employing phase-locked-loop (PLL) technology, in this study, direct power calculation of the PCC voltage and current is adopted. Subsequently, at PCC, the computed real and reactive powers are compared with reference powers in order to generate the VSI's control signals using sinusoidal pulse width modulation (SPWM). Because of the absence of the PLL and DPC method adoption, the suggested controller has a faster convergence rate compared to traditional VSI's power controllers. Additionally, it displays nearly zero steady-state power oscillations, which assure that MG's power quality is improved signifcantly. To validate the proposed PVMT-DPC method's performance, real-time simulations are conducted via real-time digital simulator (RTDS) for a variety of cases. Te obtained results demonstrate that using the proposed PVMT-DPC approach, PV VSI can track the reference power within 0.055 s where the output power has low steady-state oscillations and output current has lower total harmonic distortion (THD) of 1.68%.
IEEE Access
In this paper, a direct power control (DPC) approach is proposed for grid-tied AC MG's photovoltaic (PV) voltage source inverter (VSI) to regulate directly active and reactive powers by modulating microgrid's (MG) point of common coupling (PCC) voltage. The proposed PCC voltage modulated (PVM) theory-based DPC method (PVMT-DPC) is composed of nonlinear PVM, nonlinear damping, conventional feedforward, and feedback PI controllers. For grid synchronization rather than employing phase-lockedloop (PLL) technology, in this study, direct power calculation of the PCC voltage and current is adopted. Subsequently, at PCC, the computed real and reactive powers are compared with reference powers in order to generate the VSI's control signals using sinusoidal pulse width modulation (SPWM). Because of the absence of the PLL and DPC method adoption, the suggested controller has a faster convergence rate compared to traditional VSI power controllers. Additionally, it displays nearly zero steady-state power oscillations, which assures that MG's power quality is improved significantly. To validate the proposed PVMT-DPC method's performance real-time simulations are conducted via a real-time digital simulator (RTDS) for a variety of cases. The results demonstrate that PV VSI using the suggested PVMT-DPC approach can track the reference power quicker (0.055 s) along with very low steady-state power oscillations, and lower total harmonic distortion (THD) of 1.697% at VSI output current. INDEX TERMS Direct power control, grid-tied, microgrid, PLL, power quality, RTDS, voltage source inverter control.
Design and digital implementation of power control strategy for grid connected photovoltaic inverter
International Journal of Power Electronics and Drive System (IJPEDS), 2019
This paper presents the optimization design and a detailed implementation in FPGA (Field-Programmable Gate Array) of a power control strategy. This strategy is based on the phase shift angle of the inverter output voltage with respect to the grid voltage and DSPWM (Digital Sinusoidal Pulse Width Modulation) patterns "Phase shift angle-DSPWM" for an inverter for photovoltaic system connected to the grid. The proposed control can synchronize a sinusoidal inverter output current with a grid voltage and control the power injected into the grid. Detailed development of a digital controller with lower hardware and computation requirement is proposed. Description on the digital implementation of the A/D converter, the PI compensator, the phase shift and the DPWM, is provided. This digital control exhibit simplicity, reduction of the memory requirements and power calculation for the control. The functional structure of this system with digital control has been validated with simulations and experimental results.
Active Power Control in Grid Connected Photovoltaic System
This paper proposes a design of grid connected photo-voltaic (PV) system through implementation of active power control & MPPT control using MATLAB/Simulink. In the present scenario of world energy sector renewable sources are growing their importance day by day. The overall system model consists of a PV array, MPPT controller, Inverter and a distribution system to deliver usable power to the end grid. However, the output of solar arrays varies due to change of solar irradiation and weather conditions. Therefore, the maximum power point tracking algorithm is implemented in DC/DC converter to enable PV arrays to operate at maximum power point. The Perturb & Observe (P&O) algorithm is employed to control the boost converter. Then the central inverter is controlled by using the PI controller for active power control, which is necessary to ensure that all maximum power is transferred to the grid. Active power control is cost effective & it improves the efficiency of the system. After the complete designing of the grid connected photovoltaic system, we analysed the performance results of the PV system in MATLAB. Keywords: active power control, grid connected photovoltaic system, maximum power point tracking (MPPT), PI control, voltage source inverter ________________________________________________________________________________________________________
Optimized D-Q Vector Control of Single-Phase Grid-Connected Inverter for Photovoltaic System
International Information and Engineering Technology Association (IIETA), 2021
This paper presents the control of grid-connected single-phase inverters with vector control technology based on the D-Q spindle reference frame for photovoltaic systems. This method begins with converting the grid current of the reference sinusoidal signal to a 90-degree phase angle and converting it to a DC signal using the clack conversion principle. The aim of this research is to control the current amount of the D-axis vector and adjust the motion angle lag and lead the Q-axis vector. This mechanism control technology uses a microcontroller TMS3020F28379D This allows control of the inverter modulation to supply active and reactive power to the grid. As a result, the power factor in the system can be controlled close to unity. The simulation results using MATLAB / Simulink, compared to the prototype mechanism can confirm satisfactory accuracy.
Direct control of active and reactive power for a grid-connected single-phase photovoltaic inverter
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
This paper presents a single-phase grid-connected photovoltaic system with direct control of active and reactive power through a power management system of a Photovoltaic inverter. The proposed control algorithm is designed to allow maximum utilization of the inverter’s available KVA capacity while maintaining grid power factor and current total harmonic distortion (THD) requirements within the grid standards. To reduce the complexity and improve the efficiency of the system, two independent PI controllers are implemented to control single-phase unipolar PWM voltage source inverter. One controller is used to control the power angle, and hence the active power flow, while the other controller is used to control the reactive power, and consequently the power factor by adjusting thevoltage modulation index of the inverter. The proposed system is modelled and simulated using MATLAB/Simulink. The PV inverter has been examined while being simultaneously connected to grid and local load. Results obtained showed the ability of the PV inverter to manage the active and reactive power flow at, and below rated levels of solar irradiances; resulting in an increased inverter utilization factor, and enhanced power quality. The proposed system, was capable of operating at power factors in the range of 0.9 lead or lag for reactive power compensation purposes and delivered its power at a wide range of solar irradiance variations.
ACTIVE AND REACTIVE POWER CONTROL OF GRID CONNECTED PHOTOVOLTAIC SYSTEM
The paper presents a control scheme which controls the active and reactive power flow from the photovoltaic system to grid connected load for single stage. Control scheme is implemented in such a manner that it provides maximum active power from the PV module and reactive power as per the requirement of the load only. Photovoltaic module simulation is done using the basic equation. Photovoltaic module is taken as a current source supplying maximum power at constant voltage technique. To study the effect of solar irradiation variation on the output power flow from photovoltaic system to grid. Reactive power is independent of the solar irradiation. Passive filter is used to reduce the harmonic produced by two level inverter.