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Switching power System Stabilizer and Its Coordination for Enhancement of Multi-machine power System Stability

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CSEE Journal of power and Energy Systems 2016年第2期2卷 98-106页

作者： Yang Liu Qinghua Wu Haotian Kang Xiaoxin Zhou School of electric power Engineering South China University of TechnologyGuangzhou 510640China China electric power Research Institute State Grid Corporation of ChinaQingheBeijing 100192China

This paper proposes a coordinated switching power system stabilizer(SPSS)to enhance the stability of multimachine power *** SPSS switches between a bang-bang power system stabilizer(BPSS)and a conventional power system stabilizer(CPSS)based on a state-dependent switching *** BPSS is designed as a bang-bang constant funnel controller(BCFC).It is able to provide fast damping of rotor speed oscillations in a bang-bang *** closed-loop stability of the power system controlled by the SPSSs and the CPSSs is *** verify the control performance of the SPSS,simulation studies are carried out in a 4-generator 11-bus power system and the IEEE 16-generator 68-bus power *** damping ability of the SPSS is evaluated in aspects of small-signal oscillation damping and transient stability enhancement,***,the coordination between different SPSSs and the coordination between the SPSS and the CPSS are investigated therein.

关键词： Bang-bang PSS coordinated switching PSS multi-machine power systems

Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components

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CSEE Journal of power and Energy Systems 2024年第1期10卷 235-247页

作者： Zexin Zhao Weijiang Chen Zhichang Yang Guoliang Zhao Bin Han Yunfei Xu Nianwen Xiang Shulai Wang China electric power Research Institute Beijing 100192China State Grid corporation of China Beijing 100031China State Grid Smart Grid Research Institute Beijing 102209China State Key Laboratory of Advanced power Transmission Technology Global Energy Interconnection Research InstituteBeijing 102211China Hefei University of Technology Hefei 230009China

The modular multilevel matrix converter(M3C)is a potential frequency converter for low-frequency AC ***,capacitor voltage control of high-voltage and largecapacity M3C is more difficult,especially for voltage balancing between *** solve this problem,this paper defines sequence circulating components and theoretically analyzes the influence mechanism of different sequence circulating components on branch capacitor voltage.A fully decoupled branch energy balancing control method based on four groups of sequence circulating components is *** method can control capacitor voltages of nine branches in horizontal,vertical and diagonal *** influences of both circulating current and voltage,a cross decoupled control is designed to improve control *** results are taken from a low-frequency transmission system based on PSCAD/EMTDC,and effectiveness and precision of the proposed branch energy balancing control method are verified in the case of nonuniform parameters and an unbalanced power system.

关键词： Branch energy balancing control decoupled control low-frequency AC transmission modular multilevel matrix converter(M3C) sequence circulating components

Analytical Representation of Data-driven Transient Stability Constraint and Its Application in Preventive Control

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Journal of Modern power Systems and Clean Energy 2022年第5期10卷 1085-1097页

作者： Yiwei Fu Xiaohua Zhang Lei Chen Zengyao Tian Kaiyuan Hou Haikuan Wang State Key Laboratory of Control and Simulation of power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Jibei electric power Company Beijing 100053China Northeast China Branch of State Grid corporation of China Shenyang 110180China

Accurate transient stability assessment(TSA) and effective preventive control are important for the stable operation of power systems. With the superiorities in precision and efficiency, data-driven methods are widely used in TSA nowadays. Data-driven TSA model can be adopted in the stability constraints of preventive control optimization, but existing methods are mostly iteration-based ones, which may result in low efficiency, sometimes even non-convergence. In this paper,an analytical representation method of data-driven transient stability constraint is proposed based on a non-parametric regression model built for TSA. Key feature extraction and dominant sample selection are proposed to reduce the scale of the TSA model, and bi-level linearization is applied to further modify *** preventive control model is then formulated as a mixed-integer linear program(MILP) problem with the linearized analytical data-driven transient stability constraint, which can be solved without iterations. An overall procedure of datadriven TSA and preventive control is finally developed. Case studies show that the proposed method has high accuracy in TSA and can achieve effective preventive control of power system with high efficiency.

关键词： Data-driven critical clearing time transient stability constraint non-parametric regression optimal preventive control

A Novel Frequency-changer Control Strategy Based on a Virtual Synchronous Motor

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CSEE Journal of power and Energy Systems 2019年第2期5卷 199-205页

作者： Weijie Dong Keyan Liu Chen Lv China electric power Research Institute Beijing 100192China

The use of frequency-changers is widespread in daily electric power *** a frequency-changer could automatically adjust its power output according to the load status and power network operation,it would have a positive impact on power system *** achieve this a novel control strategy based on virtual synchronous motors(VSM)is proposed in this *** frequency-changer consists of two main parts:the rectifier and the *** the rectifier part,a UDC-Q control strategy is adopted to control the DC-link voltage and the reactive *** the inverter part,a VSM control strategy is used;it includes a power-frequency controller and an excitation controller,and can change the inverter’s output frequency and voltage with the variation of load,can adjust the active power with change of the power system *** proposed control strategy is simulated using Simulink/*** simulation results show that the proposed control strategy can follow the mechanical inertia and electrical characteristics of the synchronous moto and can effectively improve the system power quality and system stability.

关键词： Frequency-changer inverterpart power-frequ-ency control rectifierpart UDC-Qcontrol virtualsynchronous motor

Comparison of Different Virtual Inertia Control Methods for Inverter-based Generators

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Journal of Modern power Systems and Clean Energy 2020年第4期8卷 768-777页

作者： Dawei Sun Hui Liu Shunan Gao Linlin Wu Peng Song Xiaosheng Wang State Grid Wind-Photovoltaic-Energy Storage Hybrid power Generation Technology Laboratory Beijing 100045China State Grid Jibei electric power Research Institute(North China electric power Research Institute Co. Ltd.)Beijing 100045China

With the rapid development of inverter-based generators(IGs),power grid is faced with critical frequency stability challenges because the existing IGs have no *** equip IGs with inertial response,researchers have proposed several virtual inertia control methods,which can be classified into two categories:virtual synchronous generator(VSG)control and droop control based on rate of change of frequency(ROCOFdroop control).In this paper,the comparison between both virtual inertia control methods is conducted from three perspectives:mathematical model,output characteristic and small-signal ***-space models are firstly built to analyze the control mechanism of VSG control and ROCOF-droop control *** and eigenvalue analysis are conducted to study the transient responses and oscillation characteristics of both methods,which is helpful to understand the advantages and limitations of existing virtual inertia control ***,the obtained theoretical results are validated through realtime laboratory(RT-LAB)hardware-in-loop simulation platform.

关键词： Virtual inertia control virtual synchronous generator(VSG) small-signal model stability analyses subsynchronous oscillation

Review of the Configuration and Transient Stability of Large-scale Renewable Energy Generation through Hybrid DC Transmission

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CES Transactions on electrical Machines and Systems 2024年第2期8卷 115-126页

作者： Xinshou Tian Yongning Chi Longxue Li Hongzhi Liu Institute of Energy power Innovation North China Electric Power UniversityBeijing 102206China China electric power Research Institute No.15Xiaoying East RoadQingheHaidian DistrictBeijing 100192China.

Based on the complementary advantages of Line Commutated Converter(LCC)and Modular Multilevel Converter(MMC)in power grid applications,there are two types of hybrid DC system topologies:one is the parallel connection of LCC converter stations and MMC converter stations,and the other is the series connection of LCC and MMC converter stations within a single *** hybrid DC transmission system faces broad application prospects and development potential in large-scale clean energy integration across regions and the construction of a new power system dominated by new energy sources in *** paper first analyzes the system forms and topological characteristics of hybrid DC transmission,introducing the forms and topological characteristics of converter-level hybrid DC transmission systems and system-level hybrid DC transmission ***,it analyzes the operating characteristics of LCC and MMC inverter-level hybrid DC transmission systems,provides insights into the transient stability of hybrid DC transmission systems,and typical fault ride-through control ***,it summarizes the networking characteristics of the LCC-MMC series within the converter station hybrid DC transmission system,studies the transient characteristics and fault ridethrough control strategies under different fault types for the LCC-MMC series in the receiving-end converter station,and investigates the transient characteristics and fault ride-through control strategies under different fault types for the LCC-MMC series in the sending-end converter station.

关键词： Hybrid DC transmission Transient stability Configuration Control system

An End-to-end Transient Recognition Method for VSC-HVDC Based on Deep Belief Network

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Journal of Modern power Systems and Clean Energy 2020年第6期8卷 1070-1079页

作者： Guomin Luo Jiaxin Hei Changyuan Yao Jinghan He Meng Li the School of electrical Engineering Beijing Jiaotong UniversityBeijingChina the State Grid Shandong electric power Company LiaochengChina

Lightning is one of the most common transient interferences on overhead transmission lines of high-voltage direct current(HVDC)*** and effective recognition of faults and disturbances caused by lightning strokes is crucial in transient protections such as traveling wave *** recognition methods which adopt feature extraction and classification models rely heavily on the performance of signal processing and practical operation *** occur due to the poor generalization performance of recognition *** improve the recognition rates and reliability of transient protection,this paper proposes a transient recognition method based on the deep belief *** normalized line-mode components of transient currents on HVDC transmission lines are analyzed by a deep belief network which is properly *** feature learning process of the deep belief network can discover the inherent characteristics and improve recognition *** are carried out to verify the effectiveness of the proposed *** demonstrate that the proposed method performs well in various scenarios and shows higher potential in practical applications than traditional machine learning based ones.

关键词： Deep belief network transient recognition machine learning voltage source converter based high-voltage direct current(VSC-HVDC)

Three-dimensional multiphase modeling of a proton exchange membrane electrolysis cell with a new interdigitated-jet hole flow field

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Science China(Technological Sciences) 2022年第5期65卷 1179-1192页

作者： WANG XueYe WANG ZhiMing FENG YuanCheng XU Chao CHEN ZhiChao LIAO ZhiRong JU Xing Key Laboratory of power Station Energy Transfer Conversion and System of MOE School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Tianjin Key Lab of Refrigeration Technology Tianjin University of CommerceTianjin300134China Institute of Science and Technology China Three Gorges CorporationBeijing100038China

The flow field structure on the bipolar plate significantly affects the performance of the proton exchange membrane electrolysis cell(PEMEC).This paper proposes a new interdigitated-jet hole flow field(JHFF)design to improve the uniformities of liquid saturation,temperature,and current density *** common single-path serpentine flow field(SSFF)and interdigitated flow field(IFF)are used as comparative references to constitute three PEMEC *** advanced numerical model has been established to simulate the performance of the PEMEC using CFD *** results show that,due to the perpendicular mainstream and the pressure difference,the JHFF enhances the mass and heat transfer inside the porous electrode by introducing strong forced convection,which promotes gas removal underneath the ribs and *** with the comparative flow fields,the uniformities of liquid saturation,temperature,and current density distributions by using the JHFF at the anode side are increased by 19.1%,53.2%,and 40.4%,***,mainly owing to the largest conductive area,the PEMEC with the JHFF has superior polarization performance,which is 8.05%higher than the PEMEC with the SSFF.

关键词： proton exchange membrane electrolysis cell interdigitated-jet hole flow field mass transfer uniform distributions polarization performance

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Data-driven Convexification for Frequency Nadir Constraint of Unit Commitment

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Journal of Modern power Systems and Clean Energy 2023年第5期11卷 1711-1717页

作者： Yukang Shen Wenchuan Wu Bin Wang Yue Yang Yi Lin State Key Laboratory of power Systems(Department of electrical Engineering) Tsinghua UniversityBeijing 100084China IEEE electric power Research Institute Fujian Electric Power Ltd.CompanyFuzhou 350003China

The increasing penetration of the renewable energy sources brings new challenges to the frequency security of power systems. In order to guarantee the system frequency security, frequency constraints are incorporated into unit commitment(UC) models. Due to the non-convex form of the frequency nadir constraint which makes the frequency constrained UC(FCUC) intractable, this letter proposes a revised support vector machine(SVM) based system parameter separating plane method to convexify it. Based on this data-driven convexification method, we obtain a tractable FCUC model which is formulated as a mixed-integer quadratic programming(MIQP) problem. Case studies indicate that the proposed method can obtain less conservative solution than the existing methods with higher efficiency.

关键词： Unit commitment frequency constraint support vector machine(SVM) data-driven convexification