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Optimal Day-ahead Dynamic Pricing of Grid-connected Residential Renewable Energy Resources Under Different Metering Mechanisms

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Journal of Modern power systems and Clean Energy 2023年第1期11卷 168-178页

作者： Kimia Parandeh Abed Bagheri Shahram Jadid Center of Excellence for Power System Automation and Operation School of Electrical EngineeringIran University of Science and Technology(IUST)TehranIran

Nowadays,grid-connected renewable energy resources have widespread applications in the electricity ***,providing household consumers with photovoltaic(PV)systems requires bilateral interfaces to exchange energy and *** addition,residential consumers’contribution requires guaranteed privacy and secured data *** dynamic pricing is one of the incentive-based demand response methods that has substantial effects on the integration of renewable energy resources with smart grids and social *** metering mechanisms of renewable energy resources such as feed-in tariffs,net metering,and net purchase and sale are important issues in power grid operation *** this paper,optimal condition decomposition method is used for dayahead dynamic pricing of grid-connected residential renewable energy resources under different metering mechanisms:feed-intariffs,net metering,and net purchase and sale in conjunction with carbon emission *** to the stochastic nature of consumers’load and PV system products,uncertainties are considered in a two-stage decision-making *** results demonstrate that the net metering with the satisfaction average of 68%for consumers and 32%for the investigated electric company leads to 28%total load *** the case of net purchase and sale mechanism,a satisfaction average of 15%for consumers and 85%for the electric company results in 11%total load *** feed-in-tariff mechanism,in spite of increased social welfare,load reduction does not take place.

关键词： Dynamic pricing renewable energy resources feed-in-tariffs net metering net purchase and sale stochastic decision-making

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A Protection Scheme for Multi-Terminal HVDC Grids Using Local Transient Voltage Characteristics 17

A Protection Scheme for Multi-Terminal HVDC Grids Using Loca...

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17th International Conference on Protection and automation in power system, IPAPS 2023

作者： Khaleghi-Abbasabadi, Ali Mehrabi-Kooshki, Mohammad Jamali, Sadegh Iran University of Science and Technology Center of Excellence for Power System Automation and Operation School of Electrical Engineering Tehran Iran

ISBN: (纸本)9798350311532

This paper proposes a novel single-end protection scheme to satisfy the operating speed, sensitivity, and selectivity required in the protection of HVDC grids based on the modular multilevel converter (MMC). In this regard, the fault voltage characteristics are analyzed at the early stage of internal and external faults to implement the protection scheme. It is shown that the existence of smoothing inductors at both sides of the MMC-HVDC transmission line causes the attenuation of the high-frequency components of the fault traveling wave head under external faults. Whereas, the generated fault traveling wave under internal faults contains plenty of high-frequency features. Putting this into perspective, an improved complementary ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) is used to extract the highest frequency oscillations of initial fault voltage. Afterward, the high-frequency energy of the initial fault voltage is calculated by adopting the Hilbert transform (HT). As a result, the high-frequency energy calculated via ICEEMDAN-HT forms the fault identification criterion. To assess the proposed protection scheme, a four-Terminal half-bridge MMC-HVDC system is modeled in the PSCAD environment. According to simulation results, the proposed protection method is capable of detecting remote faults up to 300 Ω transition resistance within 1.1 ms only by acquiring local voltage data. Furthermore, the proposed method exhibits reliable performance under external faults and noise interferences. © 2023 IEEE.

关键词： Empirical mode decomposition

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Performance Analysis of the Modified Flux-Coupling-Type SFCL in VSC-HVDC system 31

Performance Analysis of the Modified Flux-Coupling-Type SFCL...

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31st International Conference on Electrical engineering, ICEE 2023

作者： Khakroei, Mohammad Rajeooni, Ashkan Mirzaei Pirbasti, Mahdi Rahimi Heydari, Hossein Alborz Iran Department of Engineering and R&d Alborz Iran Department of Electrical Engineering Center of Excellence for Power System Automation and Operation Tehran Iran

ISBN: (纸本)9798350312560

Although Voltage Source Converters based on HVDC (VSC-HVDC) systems have several advantages, they are vulnerable to DC fault currents. Concerning the inherent characteristics of high-temperature superconducting (HTS) material, using HTS in the fault current limiter could be a solution to limit the current in VSC-HVDC. The present paper seeks to provide an elaborately better solution to the problem mentioned above of the fault currents than what has previously been proposed. The object of this research is a modified flux coupling type superconductor fault current limiter (MFC-SFCL) to attenuate the fault current in VSC-HVDC network. The principle mechanism and operation of the SFCL and VSC-HVDC systems are modeled in detail, involving interplay or synergy between electrical and thermal properties. The simulation results demonstrate that the purposed MFC-SFCL has the proper function to mitigate the fault current. © 2023 IEEE.

关键词： High temperature superconductors

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A Protection Scheme for Multi-Terminal HVDC Grids Using Local Transient Voltage Characteristics

A Protection Scheme for Multi-Terminal HVDC Grids Using Loca...

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Protection and automation of power systems (IPAPS), International Conference on

作者： Ali Khaleghi-Abbasabadi Mohammad Mehrabi-Kooshki Sadegh Jamali Center of Excellence for Power System Automation and Operation School of Electrical Engineering Iran University of Science and Technology Tehran Iran

This paper proposes a novel single-end protection scheme to satisfy the operating speed, sensitivity, and selectivity required in the protection of HVDC grids based on the modular multilevel converter (MMC). In this regard, the fault voltage characteristics are analyzed at the early stage of internal and external faults to implement the protection scheme. It is shown that the existence of smoothing inductors at both sides of the MMC-HVDC transmission line causes the attenuation of the high-frequency components of the fault traveling wave head under external faults. Whereas, the generated fault traveling wave under internal faults contains plenty of high-frequency features. Putting this into perspective, an improved complementary ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) is used to extract the highest frequency oscillations of initial fault voltage. Afterward, the high-frequency energy of the initial fault voltage is calculated by adopting the Hilbert transform (HT). As a result, the high-frequency energy calculated via ICEEMDAN-HT forms the fault identification criterion. To assess the proposed protection scheme, a four-terminal half-bridge MMC-HVDC system is modeled in the PSCAD environment. According to simulation results, the proposed protection method is capable of detecting remote faults up to 300 Ω transition resistance within 1.1 ms only by acquiring local voltage data. Furthermore, the proposed method exhibits reliable performance under external faults and noise interferences.

关键词： Fault diagnosis Resistance Sensitivity Smoothing methods power cables HVDC transmission Simulation

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Influence of the Phase Angle Variation of Harmonic Sources on the Voltage THD Level of power Grids

Influence of the Phase Angle Variation of Harmonic Sources o...

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International Conference on Environment and Electrical engineering (EEEIC)

作者： Kia Malekian Boroujeni Alireza Jalilian Technische Universit&#x00E4 t Chemnitz Chemnitz Germany Department of Electrical Engineering Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran Iran

ISBN: (数字)9781665485371

ISBN: (纸本)9781665485388

This paper investigates the influence of the phase angle variation of Harmonic Sources (HSs) on the voltage Total Harmonic Distortion (THD) of power grids. Most standards allocate some limits only for the magnitude of harmonic sources to restrict the voltage THD level of power grids, whereas the phase angle of harmonic sources can play a significant role in this regard. Harmonic sources can cancel or reinforce each other depending on their phase angle difference. This paper aims to answer what types of harmonic sources cancel each other, and what types of them reinforce each other. For this purpose, this paper investigates the effect of the so-called prevailing ratio of harmonic sources, describing the stochastic and time-varying behavior of harmonic source phase angle, on the voltage THD. This paper applies a probabilistic harmonic power flow method based on Monte-Carlo-Simulations to a distribution grid to consider the stochastic behavior of harmonic phase angles. The results show that the prevailing ratio of harmonic sources has a considerable impact on the grids voltage THD level, especially in the case that the number of harmonic sources from a specific type is relatively high (e.g., a specific type of converter in a particular power grid). Therefore, the prevailing ratio of harmonic sources can be employed in standard guidelines as an indicator that affects the voltage THD and, consequently, the power quality.

关键词： Total harmonic distortion Substations Monte Carlo methods Voltage power system harmonics Harmonic analysis Probabilistic logic

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Performance Analysis of the Modified Flux-Coupling-Type SFCL in VSC-HVDC system

Performance Analysis of the Modified Flux-Coupling-Type SFCL...

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Iranian Conference on Electrical engineering (ICEE)

作者： Mohammad Khakroei Ashkan Mirzaei Rajeooni Mahdi Rahimi Pirbasti Hossein Heydari MAPNA Electric & Control Engineering & Manufacturing Company (MECO) Alborz Iran Department of Engineering and R&D MAPNA Generator Engineering and Manufacturing Company (PARS) Alborz Iran Department of Electrical Engineering (Center of Excellence for Power System Automation and Operation) Iran University of Science and Technology (IUST) Tehran Iran

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An adaptive PID tuning for LFC system using neuro-fuzzy inference system

An adaptive PID tuning for LFC system using neuro-fuzzy infe...

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2015 International Conference on Artificial Intelligence, ICAI 2015 - WORLDCOMP 2015

作者： Shayanfar, Heidarali Derakhshan, Ghasem Alimohammadi, Mohammadreza Khodabakhshian, Amin Center of Excellence for Power System Automation and Operation College of Electrical Engineering Iran University of Science and Technology Iran Electrical Engineering University of Isfahan Iran

ISBN: (纸本)1601324073

A new control scheme, based on Artificial Neuro-Fuzzy Inference system (ANFIS) is used to design a robust Proportional Integral Derivative (PID) controller for Load Frequency Control (LFC). The controller algorithm is trained by the results of off-line studies obtained by using particle swarm optimization. The controller gains are optimized and updated in real-time according to load and parameters variations. Simulation results of this method on a multi-machine system in comparison with conventional fuzzy controller show the satisfactory results, especially where the parameters of the system change. © 2019 ICAI 2015 - WORLDCOMP 2015. All rights reserved.

关键词： Three term control systems

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Optimal PID controller design using krill herd algorithm for frequency stabilizing in an isolated wind-diesel system

Optimal PID controller design using krill herd algorithm for...

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2015 International Conference on Artificial Intelligence, ICAI 2015 - WORLDCOMP 2015

作者： Shayanfar, H.A. Shayeghi, H. Younesi, A. Center of Excellence for Power System Automation and Operation Electrical Engineering Department Iran University of Science and Technology Tehran Iran Electrical Engineering Department University of Mohaghegh Ardabili Ardabil Iran

ISBN: (纸本)1601324073

The main purpose of this paper is to design an optimal PID controller for frequency stabilization in an isolated wind-diesel power system. Optimal tuning of PID controller, formulated as an optimization problem and solved using Krill Herd (KH) algorithm. In order to prove the performance of proposed method, simulation carried out in four cases, step change in load of diesel side, step change in wind speed, random changing of the diesel side load, and random changing of the wind speed. Also, performance indices like overshoot, undershoot, settling time, ITAE and ISTSE are calculated and compared with Bee Colony (BC) algorithm. Results show that the proposed method is very robust and effective. © 2019 ICAI 2015 - WORLDCOMP 2015. All rights reserved.

关键词： Controllers

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Performance Evaluation of Flux-Switching Permanent Magnet with Modifications to Stator and Rotor

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IOP Conference Series: Materials Science and engineering 2020年第1期671卷

作者： Mohammad Hussein Barzegari Bafghi Abolfazl Vahedi Arta Mohammad-Alikhani Center of Excellence for Power System Automation and Operation Department of Electrical Engineering Iran University of Science & Technology Tehran Iran

A flux-switching motor is a synchronous electric motor in which both field and armature coils are placed on the stator. There are thus three different stator structure types with regard to field excitation: permanent magnet, direct current field excitation, and hybrid. The rotor structure of the motor in this study reflected two types: integrated and multi-piece structure. The permanent magnet flux switching motor with integrated rotor structure offers more advantages and more attention has been paid to this as compared to other electric motors in various industries. The major advantages of this type are high torque density, ease of manufacture, high reliability, and robustness of rotor. However, these flux switching motors have relatively high cogging torque, and while work has been done on reducing the cogging torque and some literature published, most such works have focused on modifying the rotor tooth, skewing the rotor. These works study the effect of rotor shaping on motor performance, while in this paper, new rotor shapes are also considered. Finally, a method is introduced to minimise the cogging torque that has least adverse effect on other effective parameters such as torque density. Using the results of other papers, the finite element method is used to find the best method of rotor shaping in this paper.

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A Wrapper-based Feature Selection Approach for Accurate Fault Detection of Rotating Diode Rectifiers in Brushless Synchronous Generators

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IOP Conference Series: Materials Science and engineering 2020年第1期671卷

作者： A Mohammad-Alikhani A Vahedi M Rahnama M H Barzegari Bafghi Department of Electrical Engineering Center of Excellence for Power System Automation and Operation Iran University of Science and Technology (IUST) Narmak 16846 Tehran Iran

Fast and accurate fault detection is a vital issue for all engineering systems, especially for those which generate power for sensitive applications. To achieve rapid and accurate fault detection, an appropriate signal must be measured and the best features of that signal should be extracted. In this paper, an approach is proposed to detect the healthy and faulty states of a rotating diode rectifier in a brushless synchronous generator by using three-phase terminal voltage. There is not any direct access to the rectifier, and therefore, fault detection must be performed using signals from the machine itself. In order to extract the correct voltage signal, fast Fourier analysis is performed on the signal, and to select the best frequency to reduce redundancy and increase classification accuracy, a wrapper-based feature selection approach is utilised. In this approach, the best frequency is selected from among the frequencies generated according to the accuracy of the classifier, a Support Vector Machine (SVM). The other frequencies are then added one by one according to their accuracy in each step, and the best subset, that is, the one with the best accuracy for the classifier, is selected. The proposed approach is then evaluated using experimental data.

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