Advanced Photovoltaic Inverter Control Development And Validation In A Controller Hardware In The Loop Test Bed Preprint

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Advanced Photovoltaic Inverter Control Development And Validation In A Controller Hardware In The Loop Test Bed Preprint

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Author :
language : en
Publisher:
Release Date : 2018

Advanced Photovoltaic Inverter Control Development And Validation In A Controller Hardware In The Loop Test Bed Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Penetration of solar photovoltaic (PV) installations into the grid has increased in recent years. In the past, photovoltaic installations have not included grid-support functionality. Grid support functions including Volt-VAR (VVAR), Frequency-Watt (FW), Volt-Watt (VW), frequency/voltage-ride through, as well as other inverter functions such as anti-islanding are recommended by standards such as IEEE 1547 to allow PV inverters to contribute to acceptable operation and stability of distribution systems with high penetrations of PV and to ensure predictable response of the PV inverters. First, low-level and high-level grid support inverter control functions were developed and tested in simulation. The developed controller is able to integrate advanced controller functions in a coordinated approach, avoiding any conflict between the different control objectives. The algorithms were then programmed on an off-the-shelf embedded controller that included a dual-core CPU and FPGA. The details of the high-level grid support function and the lower level switching control will be presented. Second, this programmed controller is tested using a controller-hardware-in-the-loop (CHIL) test bed setup using an FPGA-based real-time simulator. The CHIL setup has the capability to run at a 500 nano-second time-step to accommodate the 20 kHz switching frequency of the developed controller. The advanced control function and CHIL test bed details provided here will aide future researchers to design, implement, and test advanced inverter functions for PV inverters.

Controller Hardware In The Loop Test Bed For Fast Switching Sic Based 50 Kw Pv Inverter Preprint

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Author :
language : en
Publisher:
Release Date : 2019

Controller Hardware In The Loop Test Bed For Fast Switching Sic Based 50 Kw Pv Inverter Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

The recent advent of wideband gap power semiconductor devices will lay the path to the future power converters. These devices provide the advantage of high switching speed and lower losses. The high cost and high switching speeds of these devices provide a challenge in the development and validation of the fast switching inverter controls with accuracy of that of a hardware setup. In this paper an FPGA real-time simulator-based controller-hardware-in-the-loop (CHIL) testbed is used to verify the low-level and advanced inverter controls fast switching wide bandgap-based string photovoltaic inverter. The paper also includes development of the CHIL testbed, which is run at a time-step of 500 ns in order to implement 20 kHz switching frequency. The developed CHIL testbed is validated through experimental results from a three-phase, 50 kW, 480VLLrms SiC devices based inverter.

Advanced Photovoltaic Inverter Functionality Using 500 Kw Power Hardware In Loop Complete System Laboratory Testing

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Author : Barry Mather
language : en
Publisher:
Release Date : 2013

Advanced Photovoltaic Inverter Functionality Using 500 Kw Power Hardware In Loop Complete System Laboratory Testing written by Barry Mather and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Electric inverters categories.

With the increasing penetration of distribution connected photovoltaic (PV) systems, more and more PV developers and utilities are interested in easing future PV interconnection concerns by mitigating some of the impacts of PV integration using advanced PV inverter controls and functions. This paper describes the testing of a 500 kW PV inverter using Power Hardware-in-Loop (PHIL) testing techniques. The test setup is described and the results from testing the inverter in advanced functionality modes, not commonly used in currently interconnected PV systems, are presented. PV inverter operation under PHIL evaluation that emulated both the DC PV array connection and the AC distribution level grid connection are shown for constant power factor (PF) and constant reactive power (VAr) control modes. The evaluation of these modes was completed under varying degrees of modeled PV variability.

Development Of Application Function Blocks For Power Hardware In The Loop Testing Of Grid Connected Inverters Preprint

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Author :
language : en
Publisher:
Release Date : 2018

Development Of Application Function Blocks For Power Hardware In The Loop Testing Of Grid Connected Inverters Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Stability and accuracy of the PHIL platform has been a common problem and challenging issue for a long time, thus continuous efforts and research have been devoted to developing interface algorithms to improve upon this. Some of existing works exhibit promising solutions to compensate the errors in the PHIL platform. However, there is a need to harmonize various solutions into a standard framework that provides a general solution for various PHIL test beds and that can be reused with minimum modifications to avoid extra effort. A good way to do this is by using application function blocks (AFBs), which are model-based and can be developed as a standard library component, thus achieving satisfactory reusability and reconfigurability for various platforms. Since PHIL simulation has the flexibility of the software simulation, proper functions can be easily implemented in the digital real-time simulator (DRTS) to preprocess the reference signal before sending it to the power amplifier. Therefore, this paper aims to develop standard AFBs in DRTS for the PHIL interface to test grid-connected inverters. The PHIL interface algorithm is separated into five AFBs that will be presented in detail in this paper.

Advanced Photovoltaic Inverter Functionality Using 500 Kw Power Hardware In Loop Complete System Laboratory Testing

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Author : Barry Mather
language : en
Publisher:
Release Date : 2013

Advanced Photovoltaic Inverter Functionality Using 500 Kw Power Hardware In Loop Complete System Laboratory Testing written by Barry Mather and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

System Control And Simulation Of A Novel Three Port Isolated Pv Inverter

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Author : Ao Sun (M.S. in Engineering)
language : en
Publisher:
Release Date : 2020

System Control And Simulation Of A Novel Three Port Isolated Pv Inverter written by Ao Sun (M.S. in Engineering) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Through the investigation of PV inverter, its market is growing, but further levelized cost of energy (LCOE) reduction is still required to complete with traditional fossil-fuel generation. This thesis proposes a novel three-port single-stage PV inverter with high power density and grid service capability, for which the LCOE can be reduced dramatically. The DC-AC stage, bidirectional battery port, and MPPT of the PV inverter system are studied respectively, with a focus on modeling, control, real-time digital simulation. For the DC-AC stage, the modulation and ZVS constrains of dual-active-bridge (DAB) converter are analyzed in depth. A hybrid control strategy with both single-phase-shift (SPS) and dual-phase-shift (DPS) is utilized to accomplish the DC-AC conversion. This control strategy can guarantee ZVS, therefore, a high efficiency over a line cycle can be achieved. The offline simulation is conducted to test the THD performance of the control algorithm. To facilitate fast responding regulation service (FRRS), a battery energy storage system (BESS) is integrated with the PV system to provide fast grid service as well as regulating the reactive power. The bidirectional battery charger is designed with CC-CV control. Through both offline simulation and hardware experiment, the performance and stability of the controller is validated. In addition, the MPPT control algorithm for the PV inverter is designed, implemented, and verified. As the whole control system must be implemented digitally, controller-hardware-in-loop (cHIL) simulation can de-risk the complicated digital control system development. cHIL provides a virtual environment for the digital controller test and enables feedback control test without a power hardware setup. The control algorithms proposed above have been validated in cHIL environment successfully. At last, a detailed power loss model of DAB converter is built. Specified methods for calculating switching losses and magnetics losses are applied. The theoretical losses calculation and circulating-power hardware test result are compared in details and the results indicate that the proposed power loss model can predict the inverter efficiency accurately

Smart Pv Inverter Control For Distribution Systems

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Author : Ehsan M. Siavashi
language : en
Publisher:
Release Date : 2015

Smart Pv Inverter Control For Distribution Systems written by Ehsan M. Siavashi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

PV solar systems employ inverters to transform dc power from solar panels into ac power for injecting into the power grids. Inverters that perform multiple functions in addition to real power production are known as smart inverters. This thesis presents a novel control of PV inverter as a dynamic reactive power compensator - STATCOM. This smart PV inverter control enables a PV solar inverter to operate in three modes - i) Full PV, ii) Partial STATCOM, and iii) Full STATCOM, depending upon system needs. The novel control is developed and demonstrated for the objectives of a) symmetrical voltage regulation, b) temporary overvoltage reduction, c) power factor correction, and d) reactive power control. In Full PV mode, the inverter performs only real power production based on solar radiation. In Partial STATCOM mode, the controller uses the remaining capacity of the inverter for voltage control, power factor correction and reactive power control. The Full STATCOM mode is invoked in emergency scenarios, such as faults, or severe voltage fluctuations. In this mode, the real power production is shut down temporarily and the entire inverter capacity is utilized for voltage regulation or TOV curtailment for providing critical support to the power system. This thesis presents a comprehensive design of the proposed smart inverter controller with all its associated system components. The performance of the smart inverter is simulated using the electromagnetic transients software PSCAD/EMTDC. It is further validated through Real Time Digital Simulation and Control Hardware in the Loop (CHIL) simulation. Finally the successful performance of the smart inverter controller is demonstrated on a 10 kW inverter in the laboratory on a simulated feeder of Bluewater Power, Sarnia, where this smart inverter is proposed to be installed. The smart PV inverter control is further shown to enhance the connectivity of PV solar farms in a realistic 44 kV Hydro One distribution feeder. It is demonstrated that if such a novel control is implemented on a 10 MW solar farm, the need for the actually installed STATCOM for voltage regulation and TOV control can be either minimized or altogether eliminated, bringing a significant savings for the utility. PV solar systems employ inverters to transform dc power from solar panels into ac power for injecting into the power grids. Inverters that perform multiple functions in addition to real power production are known as smart inverters. This thesis presents a novel control of PV inverter as a dynamic reactive power compensator - STATCOM. This smart PV inverter control enables a PV solar inverter to operate in three modes - i) Full PV, ii) Partial STATCOM, and iii) Full STATCOM, depending upon system needs. The novel control is developed and demonstrated for the objectives of a) symmetrical voltage regulation, b) temporary overvoltage reduction, c) power factor correction, and d) reactive power control. In Full PV mode, the inverter performs only real power production based on solar radiation. In Partial STATCOM mode, the controller uses the remaining capacity of the inverter for voltage control, power factor correction and reactive power control. The Full STATCOM mode is invoked in emergency scenarios, such as faults, or severe voltage fluctuations. In this mode, the real power production is shut down temporarily and the entire inverter capacity is utilized for voltage regulation or TOV curtailment for providing critical support to the power system. This thesis presents a comprehensive design of the proposed smart inverter controller with all its associated system components. The performance of the smart inverter is simulated using the electromagnetic transients software PSCAD/EMTDC. It is further validated through Real Time Digital Simulation and Control Hardware in the Loop (CHIL) simulation. Finally the successful performance of the smart inverter controller is demonstrated on a 10 kW inverter in the laboratory on a simulated feeder of Bluewater Power, Sarnia, where this smart inverter is proposed to be installed. The smart PV inverter control is further shown to enhance the connectivity of PV solar farms in a realistic 44 kV Hydro One distribution feeder. It is demonstrated that if such a novel control is implemented on a 10 MW solar farm, the need for the actually installed STATCOM for voltage regulation and TOV control can be either minimized or altogether eliminated, bringing a significant savings for the utility.

Development Of Control And Health Monitoring For A Grid Tied Three Phase Inverter Within A Group Of Coordinated Inverters

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Author : Jesse Pakula
language : en
Publisher:
Release Date : 2021

Development Of Control And Health Monitoring For A Grid Tied Three Phase Inverter Within A Group Of Coordinated Inverters written by Jesse Pakula and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Electric inverters categories.

The work in this thesis focuses on the design, implementation, and testing of control functions for an intelligent power stage (IPS), a two-stage, grid-tied converter with embedded health monitoring capability. Control functions are implemented using prototype development boards for a Texas Instruments microcontroller and an Altera field programmable gate array (FPGA). The inverter utilizes two operating modes: normal mode and independent mode. In normal mode, the controller FPGA receives voltage references from a super-controller via bidirectional serial port and generates the appropriate three-phase PWM signals. During independent mode, voltage references are generated by the microcontroller and transmitted via parallel port to the FPGA. Implementation of both control flows was demonstrated using controller-hardware-in-the-loop testing. Additionally, a parameterized feed-forward neural network (FFNN) is discussed as a potential data-driven degradation model for remaining useful life. Preliminary architecture and simulation testing is discussed.

Control Design Of A Single Phase Dc Ac Inverter For Pv Applications

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Author : Haoyan Liu
language : en
Publisher:
Release Date : 2016

Control Design Of A Single Phase Dc Ac Inverter For Pv Applications written by Haoyan Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Electric inverters categories.

This thesis presents controller designs of a 2 kVA single-phase inverter for photovoltaic (PV) applications. The demand for better controller designs is constantly rising as the renewable energy market continues to rapidly grow. Some background research has been done on solar energy, PV inverter configurations, inverter control design, and hardware component selection. Controllers are designed both for stand-alone and grid-connected modes of operation. For stand-alone inverter control, the outer control loop regulates the filter capacitor voltage. Combining the synchronous frame outer control loop with the capacitor current feedback inner control loop, the system can achieve both zero steady-state error and better step load performance. For grid-tied inverter control, proportional capacitor current feedback is used. This achieves the active damping needed to suppress the LCL filter resonance problem. The outer loop regulates the inverter output current flowing into the grid with a proportional resonant controller and harmonic compensators. With a revised grid synchronization unit, the active power and reactive power can be decoupled and controlled separately through a serial communication based user interface. To validate the designed controllers, a scaled down prototype is constructed and tested with a digital signal processor (DSP) TMS320F28335.

Advanced Control Methods On Three Phase Inverters In Distributed Energy Resources

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Author : Sara Yazdani
language : en
Publisher:
Release Date : 2020

Advanced Control Methods On Three Phase Inverters In Distributed Energy Resources written by Sara Yazdani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

"This research is an endeavor to apply new and well-established control methodologies to improve transient response, stability and reliability of three-phase inverters in grid-connected and isolated mode of operation. In the course of studying the effect of these methodologies, model-based control is introduced and is extensively applied which is relatively a new approach. In addition, the application of this concept has been studied on developing ''grid-forming'' controls to allow wind and solar inverters to support voltage and frequency levels like traditional generators. This research encloses the details of three major works of this research and their possible contributions on improving the performance of three-phase inverters in grid-connected and isolated mode of operation. The first one employs the concept of adaptive control using multiple models and a hierarchical control approach to smoothly switch between isolated and grid-connected modes of operation. In the second work, the features of the first research work have been applied and more nourished to control a ''grid-forming'' unit. The interactions of this grid-supporting converter with a ''grid- forming'' unit is the main subject of discussion in this work. The last work applies the concept of internal-model control to introduce a new control methodology in power-synchronization method. This approach has tackled the non-minimum phase issue attributed to power-synchronization methodology and offers a robust solution. Furthermore, in this research, detailed stability analysis of all the proposed control structures have been presented. Along with all simulation verification, FPGA-Based Hardware-in-the-Loop (HIL) has been utilized to verify the performance of the discrete control structure. The details of plant modeling, controller design, HIL and experimental results are presented for all of the proposed schemes in each section"--Abstract, page iv