Article
Energy & Fuels
Nan Chen, Kunpeng Zha, Haitao Qu, Fangling Li, Ying Xue, Xiao-Ping Zhang
Summary: This paper analyzes the life-cycle cost of inverter stations for conventional LCC-HVDC, CCC-HVDC, and different Flexible LCC-HVDC topologies using a Life-Cycle Cost Analysis model, and through a case study, it is found that the AC Filterless Controllable Capacitor based Flexible LCC-HVDC and improved Flexible LCC-HVDC topologies have lower cost compared to the conventional LCC-HVDC and CCC-HVDC topologies.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
Article
Energy & Fuels
Dachuan Tian, Xiaofu Xiong
Summary: This study identifies and corrects the defects in the commutation failure prevention (CFPREV) control scheme. It also reveals and analyzes the plateau effect, which indicates that excessive advancement of firings leads to more commutation failures. The study enhances the understanding of the limitation of CFPREV control and contributes to the design of related control parameters.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Jan Vobecky
Summary: The commutation of 8.5, 2.5 kA thyristors is experimentally investigated in various operating conditions. The relationship between the commutation turn-off time t(q) and commutation di/dt, reverse voltage, forward blocking dv/dt, and temperature is presented. The growth coefficients of t(q) are provided for practical magnitudes of di/dt, dv/dt, and temperature for the design of high-power converters.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Jian Liu, Sheng Lin, Wenliang Zhong, Lei Liu
Summary: This paper investigates subsequent commutation failure (SCF) in line-commutated converter based high-voltage direct-current (LCC-HVDC) transmission systems. Firstly, the normal commutation process and commutation failure characteristics are analyzed in detail. Then, a commutation failure identification method based on leakage inductance energy is proposed, along with a fault current limiting strategy for SCF mitigation. Experimental results validate that the proposed methods perform better in commutation failure identification and mitigation.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2022)
Article
Engineering, Electrical & Electronic
Chaoqun Xu, Zhanqing Yu, Biao Zhao, Zhengyu Chen, Zongze Wang, Chunpin Ren, Rong Zeng
Summary: In this letter, a new hybrid LCC based on IGCT is proposed to effectively reduce the commutation failure probability of the line commutated converter (LCC) based high-voltage direct current transmission system. By replacing some thyristors with IGCTs, the reverse blocking IGCT can withstand bidirectional voltages and actively turn off fault currents, further interrupting the commutation failure process. Experimental results verify the effectiveness and correctness of the proposed scheme.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Energy & Fuels
Pengxiang Xing, Youhang Yang, Jiasheng Peng, Linlin Yu, Ruihua Si, Peng Jia, Chuanjie Wang, Yunfeng Wen
Summary: This paper proposes an analysis strategy to improve the support capability of the receiving power grid with multi-infeed HVDC, and compares and analyzes the effects of different input schemes on the grid stability and commutation failures using simulation software. The results show that the VSC-HVDC scheme can effectively mitigate voltage fluctuations and suppress commutation failures.
Article
Engineering, Electrical & Electronic
Bohao Zhou, Bin Li, Jiawei He, Ye Li, Qingquan Li
Summary: This paper presents a hybrid cascaded LCC-MMC HVDC system which can maintain power transmission capacity by connecting the line-commutated converter and modular multi-level converter at the inverter side during commutation failures. A novel flexible reactive-power coordination strategy is proposed to enhance the stability of the system and mitigate subsequent commutation failures. Simulation cases are conducted to verify the effectiveness of the proposed method using PSCAD/EMTDC software.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Siba Kumar Patro, Anshuman Shukla
Summary: The paper introduces a novel topology named TAMBC, which achieves higher efficiency, reduced capacitor size, and enhanced efficiency through control techniques. TAMBC-HVDC systems operate over a wide range and have the ability to ride-through ac faults and provide independent active and reactive power control.
IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
Engineering, Electrical & Electronic
Dui Liu, Xiaohua Li, Zexiang Cai, Shanshan Yin
Summary: This paper addresses the issues of commutation failure and poor transient response in LCC-HVDC transmission systems. By studying virtual separated phase-locked control and trigger angle adjustment, an improved anti-harmonic control system scheme is proposed, which effectively enhances the system's robustness against harmonics.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Lerong Hong, Xiaoping Zhou, Haitao Xia, Yifeng Liu, Renlong Zhu, Yandong Chen
Summary: This paper investigates the commutation failure caused by electromagnetic coupling between adjacent lines in LCC-HVDC projects, and proposes prevention strategies. The influencing factors and coupling characteristics under fault conditions are analyzed using modeling and traveling wave theory. The mechanism of commutation failure is explored considering different fault conditions, line structures, and system operation modes, and prevention strategies are proposed.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Energy & Fuels
Haitao Wu, Yunbin Li, Zhihe Wang
Summary: By optimizing the design of the conventional low-voltage current limiting controller (VDCOL), continuous commutation failure on the receiving end of the traditional LCC-HVDC transmission system is effectively suppressed. A nonlinear VDCOL strategy is adopted to address the issue of linear adjustment method's ineffectiveness in suppressing continuous commutation failure during severe faults. Simulation results show that the proposed nonlinear VDCOL strategy with improved voltage compensation method can effectively suppress continuous commutation failures and ensure the normal operation of the HVDC transmission system.
Article
Chemistry, Multidisciplinary
Ming Yan, Zheren Zhang, Zheng Xu
Summary: This paper presents a calculation method for the main circuit parameters of a CCC-based HVDC system, including the system topology description, the calculation method for the commutation capacitor, and the calculation procedure for the main circuit parameters. The proposed method is validated through a case study and has significant implications for AC filter design in practical engineering applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Analytical
Adeel Ahmed, Danish Khan, Ahmed Muddassir Khan, Muhammad Umair Mustafa, Manoj Kumar Panjwani, Muhammad Hanan, Ephraim Bonah Agyekum, Solomon Eghosa Uhunamure, Joshua Nosa Edokpayi
Summary: With the recent development in power electronic devices, HVDC systems have become the prominent solution for economically transmitting electric power. However, the conventional HVDC systems face issues of commutation failure and transient over-voltage. This paper analyzes the dynamic and transient characteristics of Pakistan's first HVDC project and proposes a new control strategy to address these issues, increasing fault detection speed and reducing the probability of commutation failure.
Article
Energy & Fuels
Jun Lu, Xiaoming Yuan, Meiqing Zhang, Jiabing Hu
Summary: This paper proposes a supplementary control method based on PLL dynamics to mitigate successive commutation failures in LCC-HVDC systems. By analyzing the influence of PLL dynamics on the commutation process, it is found that changes in AC voltage phase significantly affect commutation. Therefore, the phase error is added to the output of the extinction angle or DC voltage control to effectively mitigate successive commutation failures.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Kleber M. Silva, Jose Jorge C. Tavares, Nilo Sergio S. Ribeiro, Felipe V. Lopes
Summary: This paper evaluates the impact of commutation failures on the transient response of phasor estimation algorithms and the performance of AC transmission line protection. The results indicate that phasor estimation errors occur during CFs, potentially causing protection functions to misoperate.
ELECTRIC POWER SYSTEMS RESEARCH
(2021)
Article
Energy & Fuels
Mohamed Alashqar, Conghuan Yang, Ying Xue, Zhaoxi Liu, Weiye Zheng, Xiao-Ping Zhang
Summary: The increasing electricity demand necessitates the installation of more generating units in the grid. However, this leads to fault current levels exceeding the limits of electrical equipment, especially in interconnected grids. Existing solutions have drawbacks, while the superconducting fault current limiter (SFCL) shows promise. This paper proposes the use of the resistive SFCL to enhance the stability of an interconnected power system, with a case study conducted on a two-area system to analyze the optimal value and locations of the SFCL. Results demonstrate that the system remains stable without the need for tuning the power system stabilizer (PSS).
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Thermodynamics
Zhibao Wang, Lijie Wei, Xiaoping Zhang, Guangzhi Qi
Summary: This paper investigates the impact of population aging on energy consumption structure in mainland China using a multivariate panel regression model. The results show that the total energy consumption in mainland China is increasing, with regional heterogeneity. The high-value energy consumption zones are concentrated in China's eastern region. The energy consumption structure is evolving with a decreasing share of coal consumption. Population aging has a significant positive correlation with national-level energy consumption structure, but a negative effect in medium-value coal consumption zones at the provincial level. GDP, the share of secondary industry, and energy price also play important roles.
Article
Engineering, Electrical & Electronic
Nan Chen, Yuefeng Yang, Lanfang Li, Chunyan Cui, Ying Xue, Xiao-Ping Zhang
Summary: This paper proposes a new commutation voltage calculation method for asymmetrical faults in Multi-Infeed LCC-HVDC systems. It also introduces CF prediction criteria based on the Voltage-Time Area (VTA) theory and a calculation method for the extra commutation voltage needed for each inverter to avoid CF. Simulation results using the CIGRE LCC-HVDC Benchmark system and a six-machine-two-area (6M2A) test system demonstrate the effectiveness of the proposed methods.
IEEE TRANSACTIONS ON POWER DELIVERY
(2023)
Article
Green & Sustainable Science & Technology
Chenyixuan Ni, Laijun Chen, Xiaotao Chen, Junyi Zhai, Shengwei Mei, Xiao-Ping Zhang
Summary: This paper proposes a novel solar-thermal-assisted AA-CAES (ST-AA-CAES) system that integrates variable thermal energy storage to improve system efficiency. The results show that the electric-to-electric conversion efficiency, round-trip efficiency, and exergy efficiency of ST-AA-CAES can reach 56.4%, 95.5%, and 55.9%, respectively. The article also demonstrates the exergy efficiency and destruction details of each subsystem. The particle swarm optimization algorithm is applied to analyze the economic feasibility of optimizing integrated energy systems, offering high accuracy, convenient implementation, and fast convergence. The system can be applied in areas with abundant solar energy resources, providing high efficiency and multi-energy supply capability.
IET RENEWABLE POWER GENERATION
(2023)
Article
Engineering, Electrical & Electronic
Senlin Yu, Xiaoru Wang, Xiao-Ping Zhang
Summary: This paper proposes a fault detection method based on the ratio of voltage integrals to improve the sensitivity of the single-end method to high-resistance faults, ensuring the continuous and reliable operation of the modular multilevel converter (MMC)-based HVDC grid during dc faults.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Thermodynamics
Jinjing Tan, Yang Li, Xiaoping Zhang, Weiqi Pan, Wenjun Ruan
Summary: This paper proposes an operation model of a district integrated energy system (IES) with a Stackelberg game approach to facilitate energy coupling and coordinate distributed resources economically. The model includes a dynamic integrated demand response (IDR) mechanism, utilizes scenario theory and the conditional value at risk (CVaR) method to model and capture uncertainties and risks. The paper also introduces innovative aspects in the business mode, defining the relation between risk sources and bearers and ensuring economic benefits for participants through diverse business channels. The effectiveness of the proposed model is verified through a case study and the benefits of all participants as well as the significant effects of IDR programs are demonstrated.
Article
Engineering, Electrical & Electronic
Xin Ma, Conghuan Yang, Xiao-Ping Zhang, Ying Xue, Jianing Li
Summary: This paper proposes full Double-Precision and Mixed-Precision Floating-Point schemes for real-time Electromagnetic Transients (EMT) simulation on FPGA platform, aiming to achieve optimal balance between numerical accuracy and computational resource cost. Through experimental comparison on rotating and non-rotating components, it is found that full Double-Precision has advantages in addressing phase shift problem. The proposed system-level Mixed-Precision scheme can achieve close accuracy to full Double-Precision scheme with 20% average reduction in resource consumption.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Proceedings Paper
Energy & Fuels
Hussaini Ali Adamu, Xiao-Ping Zhang
Summary: The conventional weighted least squares (WLS) power system state estimation algorithm often uses the same weights, causing significant deviation compared to the true solution. This paper proposes a new 3-phase re-weighted nonlinear regression method that incorporates the Welsch weight function to minimize the deviation caused by measurement errors. The proposed method outperforms the conventional state estimation method in terms of feasibility and estimation accuracy.
2023 IEEE 3RD INTERNATIONAL CONFERENCE IN POWER ENGINEERING APPLICATIONS, ICPEA
(2023)
Review
Engineering, Electrical & Electronic
Zixuan Jia, Jianing Li, Xiao-Ping Zhang, Ray Zhang
Summary: The rapid development of electric vehicles (EVs) is due to the increased focus on clean energy and environmental protection by countries and regions. This paper focuses on the optimization of EV charging, which poses new challenges to local power systems. Uncoordinated EV charging increases peak-to-valley load differences, harmonic distortions, and affects auxiliary services. To stabilize power grids, studies have been conducted on EV charging forecasting and coordinated charging strategies. The paper reviews these studies and provides recommendations for addressing EV charging challenges.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
James Naughton, Shariq Riaz, Michael Cantoni, Xiao-Ping Zhang, Pierluigi Mancarella
Summary: This paper proposes a comprehensive optimization-based techno-economic assessment of a hybrid renewable electricity-hydrogen virtual power plant (VPP) to deliver hydrogen at a lower net cost. The study shows the importance of value stacking for driving down the cost of cleaner hydrogen and highlights the significant boost in business case through multi-market participation. The research also suggests that hybrid VPPs will further improve their business cases if high price volatility continues.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2023)
Article
Energy & Fuels
David Li, Conghuan Yang, Ying Xue, Xiao-Ping Zhang
Summary: This paper proposes an online power system voltage stability index (PVSI_Online) that quantifies power system voltage stability in real time between an AC network and LCC HVDC using only local measurements. The proposed method uses a newly developed technique called Moving Window Covariance to detect a change in the AC network in real time, and a newly devised index to accurately model and capture the dynamics of the interaction between an LCC HVDC and AC network. The index is used to quantify stability and advise network operation, providing a power order value for the HVDC to restore stability.
CSEE JOURNAL OF POWER AND ENERGY SYSTEMS
(2023)
