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Generalized VSG Control Strategy for Active Power Transient Characteristic Optimization of Voltage Source Inverter 4

Generalized VSG Control Strategy for Active Power Transient ...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Huang, Xuezheng Chen, Changsong Hu, Wenhao Jiang, Mengjie Chen, Haowen Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Both droop control and virtual synchronous generator (VSG) control can be widely seen used in voltage source inverter. Among them, the virtual inertia and damping characteristics VSG control has the ability to provide virtual inertia factors that droop control does not have, but its active power response speed is very slow, and there is a large overshoot. Aiming at the problem of poor active power transient characteristics of VSG control, a generalized VSG control strategy is proposed. First, the article analyzes the transient characteristics of the active power-frequency loop of droop control and VSG control, and derives the generalized VSG control strategy. Then, according to the system model, the influence of the pole-zero point of the main controller of generalized VSG control strategy on the frequency response speed, the response speed and overshoot of active power is analyzed. And on this basis, a parameter design parameter design method is given, which can eliminate active power overshoot and make the active power response as fast as possible while keeping the frequency response speed unchanged. Finally, an inverter grid-connected bench was built to verify the effectiveness and feasibility of the proposed generalized VSG control strategy. © 2021 IEEE.

关键词： Electric inverters

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Modeling and Analysis of A Feedforward Current Based Active Common-Mode EMI Filter for Modular Multilevel Converters 4

Modeling and Analysis of A Feedforward Current Based Active ...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Liu, Jianrui Jiang, Dong Zhang, Yechi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Modular Multilevel Converter (MMC) is becoming more and more popular in High Voltage Direct Current (HVDC) system recently since it can achieve high efficiency power conversion. However, numerous switching devices in MMC system generate severe electromagnetic Interference (EMI) during its operation. Common-Mode (CM) EMI is generated by the high frequency fluctuation of voltage on the power devices and the parasitic capacitance in the system which may threaten the reliable operation of the system. EMI filters are commonly used for EMI suppression. To suppress the DC side CM EMI in MMC system, this paper proposed a feedforward current based active EMI filter. A 5-level MMC simulation platform is built in MATLAB/SIMULINK. The feasibility of this method is verified by simulation results and the CM EMI reduction could approach 20dB within several MHz with the proposed active EMI filter. © 2021 IEEE.

关键词： Simulation platform

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A Novel Control Strategy for Synchronous Reluctance Starter Generator at Low Voltage DC System 4

A Novel Control Strategy for Synchronous Reluctance Starter ...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhou, Bo Kong, Wubin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China

ISBN: (纸本)9781728171494

The More Electric Aircraft and All Electric Aircraft are very important development directions of airplane in the future, which calls for high integration and reliability in their power systems. Recently switched reluctance motor and the three-stage brushless synchronous motor are widely used in the aeronautic starter/generator system. Considering the reliability and maintainability of the power system, as well as the power density and loss characteristics of the motor, synchronous reluctance motor can be used as both starter and generator. This paper develops a new scheme of starter/generator system using synchronous reluctance motor and DC/DC converter for low voltage high power drive situation. © 2021 IEEE.

关键词： DC-DC converters

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Power System Transient Stability Assessment Based on Graph Convolutional Network 4

Power System Transient Stability Assessment Based on Graph C...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Lu, Donghao Ren, Junyu Chen, Jinfu Shi, Dongyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Fast and accurate transient stability assessment (TSA) is significant for power system. Topological information is often ignored by some machine learning methods, which may have a profound influence for TSA. For the purpose of improving the assessment accuracy and the adaptability to topology changes for online TSA, graph convolutional network (GCN) is introduced. GCN can aggregate node features and topological information. A jumping knowledge layer is added to prevent overfitting by concatenating the output of every GCN layer. Steady-state features of power system that are got through state estimation from the SCADA system are employed as the input. Tests on IEEE 39-Bus system indicate that the GCN model has a higher performance than some other methods. Several system topology changes are considered, and good adaptability to different topologies is indicated. © 2021 IEEE.

关键词： SCADA systems

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Energy Recovery of Air-Core Pulsed Alternators after Discharge Process 4

Energy Recovery of Air-Core Pulsed Alternators after Dischar...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Ding, Jiamin Xie, Xianfei Yu, Kexun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

The air-core pulsed alternator with miniaturization and light-weight is the preferred pulsed power supply for mobile combat platforms which have strict restrictions on volume and weight. After the air-core machine discharges to the load, massive magnetic energy remains in the alternator and the railgun due to the high residual currents. Usually, this magnetic energy is consumed by resistors in the circuit, but it leads to a low system efficiency. In this paper, two methods are put forward to get the magnetic energy reclaimed and thereby reused in the next projectile launching. One is to control the triggering signal of the rectifier circuit so that it can work as an inverter and the magnetic energy in field windings can be recovered into the kinetic energy in rotor. The optimum triggering angle is selected based on its value range calculated. The other is to design a resistance-capacitance absorption circuit installed on the muzzle to absorb the residual discharge current and realize the conversion of the magnetic energy in rails into the electric energy in absorption capacitor, which can be reused as an ignition capacitor. © 2021 IEEE.

关键词： Kinetics

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Study on Different Calculation Methods of Direct Carbon Emissions from Oil-Immersed Equipment on Substations 1

引用

18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： He, Jiahui Zou, Jingyi Zhang, Dandan Hou, Guobin Hu, Ke Wuhan430077 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819710683

ISBN: (纸本)9789819710676

Clarifying the level of direct carbon emissions during the operation of oil-immersed equipment in substations is crucial, yet there is limited research on accurate calculation methods for these emissions. This paper introduces various calculation approaches for direct carbon emissions from oil-immersed equipment in substations, including methods based on oil chromatography online monitoring, oil chromatography offline survey, and literature data. Additionally, a field measurement and calculation method for direct carbon emissions from oil-immersed equipment is proposed and compared with other methods. The results demonstrate that the direct carbon emission level of 0.245 gCO2eq/L/year for oil-immersed equipment, obtained from calculations based on online monitoring of oil chromatography, aligns better with literature findings. In contrast, results from calculations based on offline survey of oil chromatography tend to be lower. A direct carbon emission level of 0.074 gCO2eq/L/year for oil-immersed equipment is derived from the field measurement method, with the discrepancy arising from most of the gas produced by the equipment being dissolved in the oil. It is evident that the level of direct carbon emissions from oil-immersed equipment is relatively low compared to carbon emissions from SF6 leakage and other industrial sectors. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Greenhouse gases

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Principle and Implementation of Networked Protection in Active Distribution Networks 5

Principle and Implementation of Networked Protection in Acti...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Han, Jiexiang Zhang, Zhe Ran, Qisheng Yin, Xianggen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434256

The performance of conventional protections has deteriorated in active distribution networks (ADN) because of high penetration of distributed generator (DC) and solid state transformer (SST). In this paper, based on the features of short-circuit current fed by DG and SST, the current distribution characteristics of ADN are analyzed. Moreover, a networked protection scheme is proposed for ADN. This scheme compares the amplitudes of negative-sequence, zero-sequence and phase currents between different ports of grid component to realize fault identification. It can act rapidly and has the ability to cope with large transition resistance. Communication system only needs to transmit current amplitude, and synchronous sampling is not required. In addition, there is no requirement for voltage measurement, which will help to reduce cost. The effectiveness of the protection scheme is verified via simulation tests. © 2021 IEEE

关键词： DC transformers

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Short-Circuit Current Calculation Method for Power System with Renewable Energy Source and HVDC System 5

Short-Circuit Current Calculation Method for Power System wi...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Wang, Yuxi Qian, Kun Wen, Minghao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665434256

The short-circuit currents characteristics of renewable energy source (RES) and high voltage direct current (HVDC) system are different from the short-circuit currents characteristics of traditional synchronous generator (SG). According to the fault-ride-through (FRT) requirements of different types of RES, the steady-state short-circuit currents calculation models of doubly-fed induction generator (DFIG) and inverter-interface renewable energy source (IIRES) such as photovoltaic (PV) and direct-drive permanent magnetic synchronous generator (D-PMSG) are built in this paper. Based on the converter switching function model and the HVDC control system, the calculation model of HVDC system steady-state short-circuit currents is built. Combined with RES and HVDC system short-circuit currents calculation models, a short-circuit currents calculation method for power system with multiple types RES and HVDC under ac power system fault is proposed. Finally, the effectiveness of the proposed method of short-circuit currents calculation is verified by simulation cases. © 2021 IEEE

关键词： Synchronous generators

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Study on High Voltage Pulse Driven Air Plasma Interaction with NH3 through Direct/Indirect Manner 4

Study on High Voltage Pulse Driven Air Plasma Interaction wi...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhu, Yu Zou, Zhenping Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Removal or reuse of wasted NH3 by cold atmospheric plasma has great potential in industry and green agricultural and is benefit for energy saving and environment protection. This study investigated the interaction between pulse driven air plasma and gaseous NH3 through a direct and an indirect manner. A pin-pin discharge device was used. The gas phase products of direct reaction and indirect reaction of plasma and NH3 were compared and analyzed. It was found that double nitrogen fertilizer NH4NO3 could be formed during the indirect reaction manner while NH3 was decomposed by the direct reaction manner. Fourier transform infrared (FTIR) spectroscopy was used to measure the gas phase products. The concentration of NO, NO2 and NH3 vs. time was calculated to illustrate the chemical process inside the reaction chamber. The optical emission spectrum (OES) of discharging in different gas or gas mixture were recorded and the plasma temperature was fitted by using the spectrum of the N2 second positive system. The steady state temperature profile inside the reaction chamber during the discharge was also simulated. Finally, the possible reactions mechanisms during the direct and indirect reaction process were discussed. © 2021 IEEE.

关键词： Fourier transform infrared spectroscopy

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Research on Active Current-Limiting Control and Fault Characteristics of DC Distribution Network 6

Research on Active Current-Limiting Control and Fault Charac...

引用

6th Asia Conference on Power and Electrical engineering, ACPEE 2021

作者： Ran, Qisheng Zhang, Zhe Han, Jiexiang Yin, Xianggen Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728191591

The DC distribution network based on the hybrid modular multilevel converter (MMC) has the ability of active current-limiting control, which plays an active role in fault clearing of distribution network. However, the fault characteristics of the DC distribution network become complicated because of the active current-limiting control. It brings new problems to the fault detection and judgment of relay protection. According to the structural features of the hybrid MMC, the start-up strategy and control objectives of the active current-limiting control are analyzed in this paper. The improvement suggestions are put forward to maintain the operational safety of the power grid, as well as meet the application requirements of the relay protection. Moreover, The characteristics of the short-circuit current of the DC distribution network are analyzed based on the active current-limiting control. Meanwhile, the influences on the relay protection are estimated. Finally, the effectiveness of the proposed current-limiting control strategy and the correctness of the fault characteristic analysis results are verified by simulation tests. © 2021 IEEE.

关键词： Relay protection

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