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Improved Coordinated Control Approach for Evolved CCC-HVDC System to Enhance Mitigation Effect of Commutation Failure

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 338-346页

作者： chunyi guo Bo Liu Chengyong Zhao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University) BeijingChina

The evolved capacitor commutated converter(ECCC),embedded with anti-parallel thyristors based dual-directional full-bridge modules(APT-DFBMs),can effectively reduce commutation failure(CF)risks of line-commutated converter-based high voltage direct current(HVDC)and improve the dynamic responses of capacitor-commutated converterbased *** paper proposes an improved coordinated control strategy for ECCC with the following improvements:(1)under normal operation state,series-connected capacitors can accelerate the commutation process,thereby reducing the overlap angle and increasing the successful commutation margin;(2)under AC fault conditions,the ability of ECCC to mitigate the CF issue no longer relies on the fast fault detection,since the capacitors inside the APT-DFBMs can consistently contribute to the commutation process and further reduce the CF probability;(3)the inserted capacitors can output certain amount of reactive power,increase the power factor,and reduce the required reactive power compensation ***,the proposed coordinated control approach is presented in detail,and the extra commutation voltage to mitigate the CFs provided by the proposed control approach and an existing approach is ***,the mechanism of the improved control approach to accelerate commutation process and improve the power factor is analyzed ***,the detailed electromagnetic transient(EMT)simulation in PSCAD/EMTDC is conducted to validate the effectiveness of the proposed coordinated *** results show that the proposed approach can present a further substantial improvement for ECCC,especially enhancing the CF mitigation effect.

关键词： Evolved capacitor commutated converter(ECCC) coordinated control commutation failure power factor

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A DC Chopper Topology to Mitigate Commutation Failure of Line Commutated Converter Based High Voltage Direct Current Transmission

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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 345-355页

作者： chunyi guo Bo Liu Chengyong Zhao the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina

To reduce the probability of commutation failure(CF)of a line commutated converter based high-voltage direct current(LCC-HVDC)transmission,a DC chopper topology composed of power consumption sub-modules based on thyristor full-bridge module(TFB-PCSM)is ***,the mechanism of the proposed topology to mitigate CF is analyzed,and the working modes of TFB-PCSM in different operation states are ***,the coordinated control strategy between the proposed DC chopper and LCC-HVDC is designed,and the voltage-current stresses of the TFB-PCSMs are ***,the ability to mitigate the CF issues and the fault recovery performance of LCC-HVDC system are studied in PSCAD/*** results show that the probability of CF of LCC-HVDC is significantly reduced,and the performances of fault recovery are effectively improved by the proposed DC chopper.

关键词： Line commutated converter based high-voltage direct current(LCC-HVDC)transmission DC chopper power consumption sub-module based on thyristor full-bridge module(TFB-PCSM) commutation failure(CF) fault recovery capability

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Optimization and Configuration of Control Parameters to Enhance Small-signal Stability of Hybrid LCC-MMC HVDC System

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 213-221页

作者： chunyi guo Peng Cui Chengyong Zhao School of Electrical Engineering North China Electric Power UniversityBeijing 102206China

This paper investigates the small-signal stability of the hybrid high-voltage direct current(HVDC)transmission *** system is composed of line commutated converter(LCC)as rectifier and modular multi-level converter(MMC)as inverter under weak AC grid ***,the impact of short-circuit ratio(SCR)at inverter side on the system stability is investigated by eigen-analysis,and the key control parameters which have major impact on the dominant mode are identified by the participation factor and sensitivity ***,considering the quadratic index and damping ratio characteristic,an objective function for evaluating the system stability is developed,and an optimization and configuration method for control parameters is presented by the utilization of Monte Carlo *** eigenvalue results and the electromagnetic transient(EMT)simulation results show that,with the optimized control parameters,the small-signal stability and the dynamic responses of the hybrid system are greatly improved,and the hybrid system can even operate under weak AC grid condition.

关键词： Hybrid high-voltage direct current(HVDC) line commutated converter(LCC) modular multi-level converter(MMC) optimization of control parameter

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Dynamics and Small Signal Stability Analysis of PMSG-based Wind Farm with an MMC-HVDC System

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CSEE Journal of Power and Energy Systems 2020年第1期6卷 226-235页

作者： Yifan Wang Chengyong Zhao chunyi guo Atiq Ur Rehman The State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

The permanent magnet synchronous generator (PMSG)-based wind farm with a modular multilevel converter (MMC) based HVDC system exhibits various oscillations and can experience dynamic instability due to the interactions between different controllers of the wind farm and MMC stations, which have not been properly examined in the existing literatures. This paper presents a dynamic modeling approach for small signal stability analysis of PMSG-based wind farms with a MMC- HVDC system. The small signal model of the study system is validated by the comprehensive electromagnetic transient (EMT) simulations in PSCAD/EMTDC. Then the eigenvalue approach and participation factors analysis are utilized to comprehensively evaluate the impact of different controllers, system’s parameters and the circulating current suppressing controller (CCSC) on the small signal stability of the entire system. From eigenvalue analysis, it is revealed that as the output active power of the wind farm increases within the rated range, the overall system will exhibit a sub-synchronous oscillation (SSO) instability mode, an extremely weak damping mode, and a low frequency oscillation instability mode. From participation factors analysis, it is observed that the SSO mode and weak damping mode are primarily related to the internal dynamics of the MMC, which can be suppressed or improved by CCSC. It is determined that the low frequency oscillation mode is primarily caused by the interactions between the phase locked loop (PLL) control of the wind farm and the voltage and frequency (V-F) control of the MMC station. The analysis also depicts that the larger proportional gain value of the V-F control of the MMC station and smaller PLL bandwidth of the wind farm can enhance the small signal stability of the entire system.

关键词： HVDC modular multilevel converter(MMC) permanent magnet synchronous generator(PMSG) small signal stability sub-synchronous oscillation(SSO) wind farm

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Impact of Synchronous Condenser on the Dynamic Behavior of LCC-based UHVDC System Hierarchically Connected to AC System

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CSEE Journal of Power and Energy Systems 2019年第2期5卷 190-198页

作者： Ali Aamir Li Qiao chunyi guo Atiq Ur Rehman Zhizhong Yang State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Global Energy Interconnection Research Institute Co.Ltd Beijing 102209China

Hierarchical connection(HC)is a very attractive mode for±800 kV line commutated converter based ultra high voltage direct current(LCC-UHVDC)system connected to different AC voltage levels because of its ability to reduce the scale factor of a converter *** in the HC-UHVDC system can cause commutation failure(CF).In this paper,impact of synchronous condenser(SC)to mitigate CF in HC-UHVDC system is analyzed.A±800KV HC-UHVDC system along with synchronous condenser is built in PSCAD/*** performance analysis of HC-UHVDC for single and three phase to ground faults is *** failure immunity index(CFII),commutation failure probability index(CFPI),fault recovery time(FRT),and transient overvoltage(TOV)are used as measures to evaluate the effects of SC at HC-UHVDC system *** simulation results show that SC can make the HCUHVDC system less susceptible to CF,effectively improve fault recovery performances of the overall system,and reduce transient overvoltage when single or multiple converters are *** results of this research can provide technical assistance in real world HC-UHVDC projects.

关键词： Commutation failure hierarchical connection synchronous condenser transient overvoltage ultra-high voltage direct current

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Optimal Initialization and Starting Approach of Synchronous Condenser Integrated Power Grid

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 248-260页

作者： Puyu Wang Xing Liu Qingwen Mou Tao Yuan Tianming Gu Hemin Yang Xiao-Ping Zhang Zhengrong Xiang chunyi guo School of Automation Nanjing University of Science and TechnologyNanjing 210094China NARI Group Corporation/State Grid EPRI and also with NARI Technology Co.Ltd. Nanjing 211106China School of Engineering University of BirminghamBirminghamB152TTUnited Kingdom State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Synchronous condensers(SCs)are generally used at the receiving-end stations of ultra-high-voltage direct current(UHVDC)transmission systems due to their strong reactive power support and flexible regulation of reactive power according to the interconnected grids operating *** this paper,different starting control schemes of a SC integrated power grid are investigated providing four main contributions:1)The principle of reactive power support of the SC on the interconnected power grid is analytically studied,providing the establishment of mathematical models.2)Four different starting control schemes are developed for the initialization and SC integration,*** Scheme 1,a preset initial falling speed is directly utilized without initialization;in Scheme 2,a black start sequential control approach with a static frequency converter(SFC)is proposed;in Scheme 3,PI/PD/PID controllers are respectively applied for the excitation device at the speed-falling stage;in Scheme 4,a pre-insertion approach of an energy absorption component with R/L/RL is utilized to suppress the surges at the SC integration instant.3)The dynamic behaviors of four different starting schemes at specific operating stages are evaluated.4)The success rate of SC integration is analyzed to evaluate starting control *** of the SC interconnected system with four different starting control schemes is evaluated in the timedomain simulation environment PSCAD/EMTDC^(TM).The results prove the superiority of the proposed starting control approach in Scheme 4.

关键词： Black start dynamic behaviors excitation system pre-insertion of energy absorption components starting control schemes static frequency converter(SFC) success rate of integration synchronous condenser(SC)

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多馈入直流输电系统换相失败风险区域识别(一):计及故障期间直流电流动态特性的换相失败判别方法

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中国电机工程学报 2023年第21期43卷 8182-8192页

作者：叶全郭春义新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206

为快速准确地识别多馈入直流输电系统的换相失败风险区域,该文首先基于稳态潮流方程给出适用于交流母线及线路不同位置故障下的多馈入直流输电系统电压交互影响因子(voltage interaction factor,VIF)计算方法;通过对故障期间暂态直流电... 详细信息

为快速准确地识别多馈入直流输电系统的换相失败风险区域,该文首先基于稳态潮流方程给出适用于交流母线及线路不同位置故障下的多馈入直流输电系统电压交互影响因子(voltage interaction factor,VIF)计算方法;通过对故障期间暂态直流电流组成分量进行分解,得到直流电流动态特性的近似解析方法,基于此,改进已有的换相失败临界电压计算方法,并确定多馈入直流输电换相失败的边界条件,最终提出计及直流电流动态特性的换相失败判别方法。为验证所提换相失败判别方法的准确性,在PSCAD/EMTDC中搭建双馈入和三馈入直流输电系统的详细电磁暂态模型,对比理论计算结果和仿真结果之间的误差,结果表明,提出的换相失败判别方法与传统方法相比,在计及直流电流动态特性后提高了换相失败判别的准确性,该方法可为后续开展换相失败风险区域量化评估提供基础。

关键词：多馈入直流输电换相失败判别直流电流动态特性电压交互影响因子

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特高压混合级联直流输电系统逆变侧MMC的功率返送现象及有功调控策略

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高电压技术 2022年第12期48卷 5037-5046页

作者：樊鑫郭春义新能源电力系统国家重点实验室(华北电力大学) 北京102206

特高压混合级联直流输电系统在逆变侧采用了多个模块化多电平换流器(modular multilevel converter,MMC)并联后与电网换相换流器(line commutated converter,LCC)串联的结构,其中定电压控制MMC在系统运行工况改变或发生故障时会产生功... 详细信息

特高压混合级联直流输电系统在逆变侧采用了多个模块化多电平换流器(modular multilevel converter,MMC)并联后与电网换相换流器(line commutated converter,LCC)串联的结构,其中定电压控制MMC在系统运行工况改变或发生故障时会产生功率返送现象。为了避免计划之外的功率返送现象,提出了一种简单有效的有功调控策略来改善功率返送现象,其基本原理为通过调节定功率MMC的有功指令来维持MMC换流站功率平衡。基于PSCAD/EMTDC建立了相应的电磁暂态模型,分别在不同工况下对有功调控策略的功率返送改善效果进行对比,电磁暂态仿真结果表明有功调控策略能够有效改善功率返送现象,而且也可以加快故障恢复速度,降低故障过程中及故障后系统主要电气量的波动。

关键词：特高压混合级联直流系统功率返送交直流故障模块化多电平换流器有功调控策略过电流

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多馈入直流输电系统换相失败风险区域识别(二):换相失败风险量化评估及风险区域快速识别

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中国电机工程学报 2023年第23期43卷 8999-9009页

作者：叶全郭春义新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206

针对多馈入直流输电系统换相失败风险程度量化评估及风险区域快速识别的难题,该文研究多馈入直流输电系统换相失败的关键影响因素;然后,基于系列文章(1)的改进换相失败临界电压计算方法,并通过归一化思想,提出一种换相失败风险程度量化... 详细信息

针对多馈入直流输电系统换相失败风险程度量化评估及风险区域快速识别的难题,该文研究多馈入直流输电系统换相失败的关键影响因素;然后,基于系列文章(1)的改进换相失败临界电压计算方法,并通过归一化思想,提出一种换相失败风险程度量化评估指标,其正负可用于判断不同直流子系统是否发生换相失败,其幅值大小可以反映当前状态至发生换相失败所需要的电压跌落幅度(幅值为负)或当前状态至不发生换相失败所需要的电压提升幅度(幅值为正);最后基于上述量化评估指标,提出不同故障严重程度下的换相失败风险区域快速识别方法。基于PSCAD/EMTDC搭建双馈入和三馈入直流输电系统模型,对换相失败风险程度评估结果和换相失败风险区域快速识别结果进行有效性验证。结果表明,提出的指标可用于量化评估多馈入直流输电系统换相失败的风险程度,且能够在不同故障严重程度下准确识别多馈入直流输电系统的换相失败风险区域。

关键词：多馈入直流输电换相失败风险风险程度量化评估风险区域识别

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混合级联直流输电系统整流/逆变不同控制回路动态交互作用与稳定性研究

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中国电机工程学报 2024年第1期44卷 231-243,I0019页

作者：赵薇郭春义杨硕新能源电力系统国家重点实验室(华北电力大学) 北京市昌平区102206

为了研究混合级联直流输电系统整流侧和逆变侧各换流器控制系统间的交互作用,文中首先建立混合级联直流输电系统的状态空间模型,并推导得到系统的多输入多输出传递函数模型。然后针对不同的研究目标,根据单通道分析设计理论建立等效单... 详细信息

为了研究混合级联直流输电系统整流侧和逆变侧各换流器控制系统间的交互作用,文中首先建立混合级联直流输电系统的状态空间模型,并推导得到系统的多输入多输出传递函数模型。然后针对不同的研究目标,根据单通道分析设计理论建立等效单输入单输出反馈控制模型;在此基础上,分离出不同控制回路的耦合控制通道,定量评估系统强度、逆变侧交流联络线与控制参数等对控制回路间交互作用的影响。理论分析表明,当整流侧或逆变侧交流系统强度降低时,两侧控制回路间交互作用增强;当交流联络线长度缩短时,逆变侧电网换相换流器(line commutated converter,LCC)和模块化多电平变换器(multilevel modular converter,MMC)控制回路间的动态交互增强,各控制环节参数之间存在相互制约关系。最后,在PSCAD/EMTDC上搭建混合级联直流输电系统的电磁暂态详细仿真模型,验证所建立单输入单输出反馈控制模型及上述理论分析结果的正确性。

关键词：混合级联直流输电系统多变量反馈控制理论交互作用单输入单输出反馈控制模型

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