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Improved Virtual Inertia Emulation for Frequency Stability Enhancement in Microgrid System

INTERNATIONAL JOURNAL OF RENEWABLE ENERGY RESEARCH 2022年第4期12卷 2120-2130页

作者： Malahmeh, Banan K. Alawasa, Khaled M. Almajali, Ziyad S. Mutah Univ Fac Engn Dept Elect Engn Mutah 61710 Alkarak Jordan

The increased integration of inverter-based renewable energy sources (RESs) in today's microgrids leads to many problems associated with the low inertia nature of power electronic devices that degrades the frequency response and might lead to system instability. However, virtual inertia control (VIC) is considered as one of the suitable control schemes used for controlling microgrids and maintaining the frequency stability in isolated electrical systems. This paper presents an improved technique for VIC for the battery energy storage system to enhance the frequency stability in microgrid systems under large penetration levels for RESs. The amount of emulated inertia is proportional to the rate of frequency change and the value of the VIC. Thus, in this study the developed VIC scheme uses two types of controllers, which are: the PI controller which is used for controlling the ROCOF signal and the fuzzy logic controller which is used for selecting the appropriate value of the inerta constant. Simulation and system modelling are performed using the MATLAB/Simulink software environment. The proposed scheme was tested under various operating conditions including changes in system parameters and changes in penetration levels of renewable energy resources. Further, the proposed scheme was compared with three available schemes in the literature, namely;conventional VIC, enhanced VIC with damping properties, and self-adaptive VIC, the proposed scheme shows a good improvement in the overall frequency response.

关键词： Microgrid Frequency Stability Virtual inertia Renewable energy source fuzzy-logic controller

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Design and Performance Analysis of fuzzy Based Hybrid controller for Grid Connected Solar-Battery Unified Power Quality Conditioner

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INTERNATIONAL JOURNAL OF RENEWABLE ENERGY RESEARCH 2023年第1期13卷 1-13页

作者： Srilakshmi, Koganti Gaddameedhi, Sravanthy Santhosh, D. Teja Yashaswini, N. Valluri, Nagaraju Reddy, J. Ganesh Prasad Kumar, N. M. G. Naik, D. Anil Sreenidhi Inst Sci & Technol Dept Elect Engn Hyderabad India CVR Coll Engn Dept Comp Sci & Engn Hyderabad India Sreenidhi Inst Sci & Technol Dept Mech Engn Hyderabad Pakistan Sreenidhi Inst Sci & Technol Dept Elect & Commun Engn Hyderabad India Sree Vahini Inst Sci & Technol Dept Elect & Elect Engn Tiruvuru India Sree Vidyanikethan Coll Engn Dept Elect & Elect Engn Tirupati India Sreenidhi Inst Sci & Technol Hyderabad India

Nowadays, integration of the non-conventional energy sources like wind, tidal, solar etc into the grid is suggested in order to minimize the losses in the distribution network and to meet the demand. The arrival of the power electronics equipments to control the nonlinear loads has made an impact on the power quality. The unified power quality conditioner is a FACTS device with the back to back converters, coupled together with a DC-Link capacitor. This paper suggests an intelligent hybrid controller for the solar Photo-voltaic system and Battery storage system integrated UPQC. The proposed controller is the combination of fuzzy logic controller and integral sliding-mode controller. The synchronization of phases is created by self tuning filter in association with unit vector generation method (STF-UVGM) for the superior performance of UPQC during the unbalanced/ distorted supply voltages conditions. Therefore, the necessity of Phase-locked-loop, Low pass filters and High pass filters are eliminated. However, Self tuning filter is used for separating the Harmonic and Fundamental components. In addition, STF-UVGM was used for generation of synchronization phases of series and shunt filters. The prime objectives of the suggested fuzzy logic integral sliding mode hybrid controller (FLISMHC) are fast action to retain the DC-Link voltage to the constant value during load/ irradiation variations, diminish the harmonics in the current waveforms, power-factor enhancement, maximum mitigation of sag/swell/ disturbances in the supply voltage, and appropriate compensation for the un-balanced supply voltages. The performance analysis of FLISMHC was investigated on five test cases for several combinations of loads/ supply voltages and to demonstrate the supremacy of the suggested FLISMHC comparative analysis was carried out with the methods that exist in literature and with the standard controllers like PI, sliding mode, and FL. The proposed method shows an extra-ordinary perform

关键词： Self tuning filter fuzzy-logic controller Unified Power Quality Conditioner Solar PV generation Battery system

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Low-Voltage Ride-Through Coordinated Control for PMSG Wind Turbines Using De-Loaded Operation

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IEEE ACCESS 2021年 9卷 66599-66606页

作者： Kim, Chunghun Kim, Wonhee Pai Chai Univ Dept AI Elect Engn Daejeon 35345 South Korea Chung Ang Univ Sch Energy Syst Engn Seoul 06974 South Korea

Low-voltage ride-through (LVRT) is important for the grid integration of wind power systems (WPSs). Each grid operator defines a grid code, including the LVRT requirement, considering their power system characteristics. During grid faults, LVRT is needed for the protection of WPS because the over current can induce damage to the power converter system. An important issue in the LVRT method of WPS is the energy capacity because sufficient reserve energy capacities of wind turbine inertia and an energy storage system (ESS) are needed for a successful LVRT operation. Although ESS can store excess energy of the WPS during a grid fault, it is physically limited considering its energy capacity. Moreover, WPS has a low reserve energy capacity, especially when the WPS operates in high wind speed conditions. Thus, we propose the deloaded operation of WPS for the preparation of LVRT by reducing the power generation of WPS. The effectiveness of the proposed method is validated by modeling a WT and an ESS topologically and performing simulations using the MATLAB/Simulink SimPowerSystems toolbox.

关键词： Rotors Voltage control Power system stability Mathematical model Wind speed Wind power generation Circuit faults Deloaded control DC link voltage energy storage system fuzzy-logic controller rotor inertia low-voltage ride-through rotor speed limitation pitch angle control

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Optimal fuzzy logic control of energy storage systems for V/f support in distribution networks considering battery degradation

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2022年 139卷 107867-107867页

作者： Liu, Wei Xu, Yan Feng, Xue Wang, Yu Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Singapore Inst Technol Sch Engn Singapore 138683 Singapore Nanyang Technol Univ Rolls Royce NTU Corp Lab Singapore 639798 Singapore

High penetration of renewable energy resources into distribution networks induces frequency and voltage fluctuations to the power grids. Unlike high-voltage transmission lines, the x/r ratio of distribution lines is relatively low, thereby frequency support and voltage regulation are closely coupled. Considering their coupling relationship, a rule-based fuzzy logic controller (FLC) is proposed in this paper for battery energy storage systems (BESSs) to coordinately provide bus voltages and frequency support. The membership functions of the FLC are optimized offline to minimize the frequency and voltage deviations using Pareto front criterion. Moreover, with a practical battery aging dataset, a battery degradation model is constructed to design fuzzy rules for prolonging battery lifetime. The proposed method is tested on the IEEE 33-bus distribution network and compared with benchmarking methods. The simulation results verify that the proposed method can simultaneously provide frequency and voltages regulation support to satisfy the operational limits while extending the battery lifetime.

关键词： fuzzy-logic controller Energy storage systems Multi-objective optimization Frequency support Voltage regulation

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Coordinated fuzzy-Based Low-Voltage Ride-Through Control for PMSG Wind Turbines and Energy Storage Systems

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IEEE ACCESS 2020年 8卷 105874-105885页

作者： Kim, Chunghun Kim, Wonhee Pai Chai Univ Dept AI Elect Engn Daejeon 35345 South Korea Chung Ang Univ Sch Energy Syst Engn Seoul 06974 South Korea

Coordinated control methods involving a wind turbine (WT) and an energy storage system (ESS) have been proposed to meet several objectives, such as smoothing wind power (WP) fluctuations, shaving peaks, enabling power scheduling, and allowing low-voltage ride-through (LVRT). LVRT requirement is defined by grid operators, and it should be satisfied whenever grid faults occur. Several methodologies have been proposed for the LVRT both with or without the use of an ESS. Furthermore, using an ESS is more advantageous for several WP applications. By using an ESS, WTs can be operated in a more economic and reliable way. However, the installation cost of an ESS is high and it has operation range constraints for charging and discharging. Moreover, the WT operation condition and ESS state-of-charge (SoC) can be different when a grid fault occurs. Therefore, it is necessary to coordinate both units, WT and ESS, for reliable and economic operation during a grid fault. Thus, we propose a coordinated fuzzy-based LVRT method that considers the different operation conditions of a WT and an ESS. From the proposed method, the effective reference powers of a WT and an ESS are evaluated by considering the rotor speed and SoC in the fuzzy control algorithm. The effectiveness of the proposed method is validated by considering two case studies on ESS SoC and WT rotor speed violations.

关键词： Coordinated controller DC link regulation energy storage system fuzzy-logic controller inertial response low-voltage ride-through rotor speed violation

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Enhanced Low-Voltage Ride-Through Coordinated Control for PMSG Wind Turbines and Energy Storage Systems Considering Pitch and Inertia Response

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IEEE ACCESS 2020年 8卷 212557-212567页

作者： Kim, Chunghun Kim, Wonhee Pai Chai Univ Dept Elect Engn Daejeon 35345 South Korea Chung Ang Univ Sch Energy Syst Engn Seoul 06974 South Korea

Low-voltage ride-through (LVRT) requirements are defined by grid operators, and they vary based on power system characteristics. Coordinated LVRT control methods have been proposed for wind turbines (WTs) and energy storage systems (ESSs). ESSs can successfully help achieve LVRT by regulating DC-link voltage during a grid fault. During LVRT, WTs cannot transfer power to a grid because of their low voltage and current limit. Moreover, as grid operators typically require reactive power support during a grid fault, active power cannot be properly transferred to the grid. This results in fluctuation in the DC-link voltage in wind power generators and it can induce significant damage in the systems. ESS have been used for achieving better LVRT response to protect WT systems and meet LVRT grid requirements. Previous coordinated control methods have mainly focused on DC-link voltage regulation based on ESS charging and discharging control. As ESSs have high installation cost and limited charging capacity, it is better to coordinate the LVRT response properly considering the state of charge of ESSs and the rotor speed and pitch angle of WTs. In this work, an enhanced coordinated LVRT control method is proposed based on a fuzzy-logic algorithm. Fixed torque of the rotor control and a fixed ramp rate of the pitch control are employed for power analysis which is used in formulating fuzzy-logic controller. The effectiveness of the proposed method is validated by modeling a WT and an ESS topologically and performing simulations using the MATLAB/Simulink SimPowerSystems toolbox.

关键词： Rotors Voltage control Wind speed Wind power generation Circuit faults Torque Reactive power Enhanced coordinated controller DC link voltage energy storage system fuzzy-logic controller rotor inertia low-voltage ride-through rotor speed limitation pitch angle control

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fuzzy Control Electric Drive for a Vessel Descent-Rise Device

Fuzzy Control Electric Drive for a Vessel Descent-Rise Devic...

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International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

作者： Chupina, K., V Usoltsev, V. K. Far Eastern Fed Univ Vladivostok Russia

ISBN: (纸本)9781509056484

Efficiency of autonomous underwater vehicles (AUV) use decreases because of the existing descent-rise devices imperfect design. These devices descent AUVs overboard of the support ship before starting their mission and rise back on the deck after the operation ends. Besides, it is necessary to rise AUVs aboard for accumulator charging. These operations can be possible only at low sea force, therefore, a vessel demurrage takes place because of waiting for a calm weather. Besides, operations for connection of the accumulator to the charger are very time-consuming and injury-causing. It is offered to charge autonomous underwater vehicle's accumulators under water using the underwater charging station and produce descent-rise operations automatically. The descent-rise devices should have a heave compensation function. The automatic control system for heave compensation of a support ship at the AUV immersion depth is described.

关键词： autonomous underwater vehicles descent-rise device heave compensation system electric drive fuzzy-logic controller

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Comparative Analysis of Hysteresis Current Control and SVPWM on fuzzy logic based Vector Controlled Induction Motor Drive 1

Comparative Analysis of Hysteresis Current Control and SVPWM...

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1st IEEE International Conference on Power Electronics, Intelligent Control, and Energy Systems (ICPEICES)

作者： Mishra, Tanmay Devanshu, Ambrish Kumar, Narendra Kulkarni, Ashish R. Delhi Technol Univ Elect Engn Dept New Delhi India

ISBN: (纸本)9781467385879

This paper presents the performance comparison of Hysteresis Current Control and SVPWM for generation of PWM signals for voltage source inverter in vector controlled Induction Motor Drive. The dynamic performance of the drive for its speed regulation mode is described using both PWM techniques. fuzzy logic Control (FLC) is used for speed controller in both cases. The dynamic performance and ripple content is analyzed using FLC based SVPWM and HCC IM drive and compared at different operating conditions such as change in load torque and speed reversal. A MATLAB /SIMULINK model of FLC based vector controlled IM drive is simulated using hysteresis current controller and SVPWM for PWM signal generation and dynamic performance of these two techniques are compared.

关键词： fuzzy-logic controller Hysteresis Current Control SVPWM Indirect Vector Control

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A real-time control of photovoltaic water-pumping network

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COMPUTERS & ELECTRICAL ENGINEERING 2015年 46卷 14-28页

作者： Ben Salah, Chokri Mimouni, Mohamed Faouzi Ouali, Mohamed Natl Sch Engn Sfax Control & Energy Management Lab Dept Elect Engn Sfax 3038 Tunisia Natl Sch Engineers Monastir Dept Elect Engn Res Unit Study Ind Syst & Renewable Energy ESIER Monastir 5019 Tunisia

In this paper a dynamic modeling, simulation, control and energy management of photovoltaic water-pumping network system is presented. A fuzzy-logic controller has been proposed for a real-time control of the system. The controller generates the reference speeds needed for the pulse-width-modulation generator to control each DC/DC boost converter taking into account the water levels in three tanks and the instantaneous value of the solar radiation. The main objectives of the fuzzy-logic controller are the design of an adequate maximum power-point tracker to extract the maximum power, regulate the water in the three tanks and finally ensure the correct operation for all the conversion strings in order to optimize the quantity of pumped water. The system performance under different scenarios has been checked carrying out Matlab/Simulink simulations using a practical load-demand profile and real weather data and comparing them to another control algorithm. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： Photovoltaic energy Water-pumping network Speed-control fuzzy-logic controller Water-level regulation

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Comparative Analysis of Hysteresis Current Control and S VPWM on fuzzy logic based Vector Controlled Induction Motor Drive

Comparative Analysis of Hysteresis Current Control and S VPW...

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International Conference on Power Electronics, Intelligent Control and Energy Systems

作者： Tanmay Mishra Ambrish Devanshu Narendra Kumar Ashish R. Kulkarni Electrical Engineering Department Delhi Technological University New Delhi India

ISBN: (纸本)9781467385886

This paper presents the performance comparison of Hysteresis Current Control and SVPWM for generation of PWM signals for voltage source inverter in vector controlled Induction Motor Drive. The dynamic performance of the drive for its speed regulation mode is described using both PWM techniques. fuzzy logic Control (FLC) is used for speed controller in both cases. The dynamic performance and ripple content is analyzed using FLC based SVPWM and HCC IM drive and compared at different operating conditions such as change in load torque and speed reversal. A MATLAB/SIMULINK model of FLC based vector controlled IM drive is simulated using hysteresis current controller and SVPWM for PWM signal generation and dynamic performance of these two techniques are compared.

关键词： fuzzy-logic controller Hysteresis Current Control SVPWM Indirect Vector Control

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