Maulik Kandpal

Grid integration of solar PV generating system using three-level voltage source converter

This paper presents a solar grid integrated power generating system using a three level voltage source converter (VSC) operating at low switching frequency with double synchronous rotating frame phase locked loop (DSRF-PLL) based control algorithm. An incremental conductance algorithm is used to track maximum power from solar PV (Photovoltaic) array which is fed to the grid. The use of three level VSC offers the advantage of low switching losses and operation at high voltages and powers. It also results in lower total harmonic distortion (THD) of grid currents. Simulated results validate the design and control algorithm under steady state and dynamic conditions.

Grid Integration of Single Stage Solar PV System using Three-level Voltage Source Converter

Abstract This paper presents a single stage solar PV (photovoltaic) grid integrated power generating system using a three level voltage source converter (VSC) operating at low switching frequency of 900 Hz with robust synchronizing phase locked loop (RS-PLL) based control algorithm. To track the maximum power from solar PV array, an incremental conductance algorithm is used and this maximum power is fed to the grid via three-level VSC. The use of single stage system with three level VSC offers the advantage of low switching losses and the operation at high voltages and high power which results in enhancement of power quality in the proposed system. Simulated results validate the design and control algorithm under steady state and dynamic conditions.

Grid integration of single stage SPV system using asymmetric cascaded 7-level VSC

This paper presents a single stage solar photovoltaic (SPV) grid integrated power generating system using a three-phase seven level asymmetric cascaded H-bridge voltage source converter (VSC) operating at low switching frequency using level shift PWM (Pulse Width Modulation) technique. The use of asymmetric cascaded H-bridge topology presents the benefit of high number of voltage levels with less number of switching devices in comparison to symmetric cascaded H-bridge topology and offers the advantage of low switching losses, reduced total harmonic distortion (THD), ease of operation at high voltages and high power which results in enhancement of power quality in the proposed system. Simulated results in MATLAB validate the design and control algorithm under steady state and dynamic conditions at varying solar insolations.

Control of Grid Tied Smart PV-DSTATCOM System Using an Adaptive Technique

This paper presents a control of smart photovoltaic (PV)-distribution static compensator (DSTATCOM) grid tied system using an adaptive reweighted zero attracting control algorithm with perturb and observe maximum power point tracking technique for a three phase system to improve power quality and support the three phase ac grid by supplying power both to the grid and the connected loads. The proposed PV grid tied system is capable of working round the clock. During sunshine conditions, the proposed system performs dual functions of improving power quality by working as DSTATCOM and also transfers power to the load and the grid obtained from PV array. However, during night or cloudy conditions, the proposed system works as DSTATCOM improving power quality and the power is transferred from the grid to the load. The system is termed as a smart as it is able to perform both modes automatically sensing the PV power and is capable of multidirectional power flow. The experimental validation is carried out on a developed prototype in the laboratory under varying modes.

ZA-QLMS based control approach for DSTATCOM under abnormal grid conditions

This paper presents a control of DSTATCOM (Distribution Static Compensator) using an adaptive zero attracting quaternion-valued least-mean-square algorithm (ZA-QLMS) control algorithm for a three phase three wire system with connected nonlinear loads under abnormal grid conditions. It highlights the performance of DSTATCOM used for reducing harmonics in grid currents and grid voltages, maintaining unity power factor at grid and keeping grid currents sinusoidal even under load unbalance in any phase. Moreover, the operation of the system under voltage sag and swell are also studied. The experimental validation is carried out on a developed prototype in the laboratory under various conditions and its performance is found quite satisfactorily.

Integration of multiple source SPV grid tied system using 27-level cascaded H-bridge converter

The cascaded converter (CC) topology is proposed for solar PV (Photovoltaic) system to provide high number of voltage levels, reduced harmonics distortion, low switching losses, simplicity of process at high voltages and improvement in power quality. It has multiple source SPV tied to AC grid which incorporates a twenty seven level CC operating at fundamental switching frequency. The design and control are validated under varying conditions through simulated results in MATLAB.

Grid integration of single source SPV system using asymmetric cascaded 7-level VSC

This paper presents a single stage solar photovoltaic (SPV) grid integrated power generating system using a seven level asymmetric cascaded H-bridge voltage source converter (VSC) operating at low switching frequency using level shift PWM (Pulse Width Modulation) technique. A novel technique using one SPV array to power the entire cascaded H bridges is introduced which drastically reduces the requirement of SPV array. The advantage of using an asymmetric cascaded topology is that high number of voltage levels are produced with less number of switching devices and provides ease of operation at high voltages and high power which results in enhancement of power quality in the proposed system. Simulated results validate the design and control algorithm under steady state and dynamic conditions at varying solar insolations.

Grid integration of single stage SPV system using three-level flying capacitor VSC

A single stage solar photovoltaic (SPV) grid integrated power generating system is presented using a three level flying capacitor (TLFC) voltage source converter (VSC) operating at low switching frequency with decoupled current controller based control algorithm along with feed forward term to enhance the system performance under dynamic conditions. An incremental conductance based maximum power point tracking (MPPT) technique is used to track maximum power from SPV array, and the tracked maximum power is fed to the three phase AC grid via a TLFC-VSC at unity power factor. The use of TLFC-VSC offers the advantages of low switching losses and the operation at high voltages and high power which results in improvement of power quality with low harmonics in line currents. Simulated results validate the design and control algorithm under varying solar insolation levels at different switching frequencies.

Control of grid tied SPV-DSTATCOM system using adaptive RLS technique

This paper presents a SPV (Solar Photovoltaic)-DSTATCOM (Distribution Static Compensator) grid tied system controlled using a unity zone variable forgetting factor RLS (Recursive Least Square) algorithm along with P & O (Perturb and Observe) maximum power point tracking method. The proposed SPV grid tied system operates in two modes: Mode-1, the SPV-DSTATCOM mode which comes into operation during sunshine, in which the SPV-DSTATCOM performs the DSTATCOM operation improving power quality and is also capable of transferring power to the load and the grid. However, during the night or cloudy sky, the system operates in Mode-2 i.e. the DSTATCOM mode, in which only the power quality is improved which is deteriorated by connected loads. Thus, the proposed system is capable to meet peak power demand when the solar energy is available. However, it improves the system power quality during day and night. The experimental validation is carried out on a developed prototype in the laboratory under varying modes.

A single source SPV grid tied system using asymmetric cascaded 27-level VSC

This paper presents three phase single stage single source SPV (Solar Photovoltaic) grid tied system using asymmetric cascaded 27-level converter operating at fundamental switching frequency using pulse width modulation (PWM) scheme. An application of the asymmetric cascaded 27-level converter in comparison to symmetric cascaded 27-level converter have advantages viz. higher voltage levels, less distortion, low switching losses, simplicity of operation at high power that leads to the improvement of power quality of the system proposed herein. A simple decoupled current controller with incremental conductance maximum power point tracking method is used to control the proposed system. The simulated results in MATLAB validate the system under varying conditions such as solar insolations level.