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The 16th IET International Conference on AC and DC power Transmission (ACDC 2020)

作者： S. Gong W. Zhang Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan 250061 China

With the emerging use of VSC-HVDC links, the hybrid multi-infeed HVDC (HMIDC) system that includes LCC-HVDC and VSC-HVDC links appears and is becoming a promising power transmission structure in modern power systems. In order to make full use of the fast power adjustment capability of VSC, mitigate commutation failures and keep the voltage stability of the AC power grid, this paper proposes a hierarchical control strategy of long-term voltage stability in a HMIDC system. The converter control coordinates control variables including VSC-HVDC reactive power, shunts, and inverter extinction angle to ensure safe operation of LCC-HVDC. The system level is a model predictive control based on trajectory sensitivity with the objective of minimizing the deviation of voltage trajectories and the control cost, which coordinates the AC and DC control variables to ensure the safe operation of the AC system. The simulation results of a HMIDC system show that the control method proposed in this paper can fully coordinate all kinds of control methods of AC/DC system, improve the long-term voltage stability of the system.

关键词： predictive control power grids power transmission control control system synthesis HVDC power transmission invertors HVDC power convertors commutation power system stability power transmission faults power system control reactive power control

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Corrigendum to “Single-ended DC line protection scheme based on first peak time of current-limiting reactor voltage” [Int. J. Electr. power Energy Syst. 150 (2023) 109100]

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International Journal of Electrical power & Energy systems 2023年 152卷

作者： Xiuyan Wei Guibin Zou Chaochao Chen Shuo Zhang Chenghan Zhou Shenglan Song The Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Ji’nan 250061 China State Grid Weifang Power Supply Company Weifang 261061 China

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Analysis of Commutation Failure in LCC-HVDC systems During Unbalanced Conditions Using Sequence Components

Analysis of Commutation Failure in LCC-HVDC Systems During U...

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International Conference on power system Technology (powerCON)

作者： Ahmed Omer Xiaohui Wang Zhenjian Xie Chen Li Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan China State Grid Jiangsu Electric Power Co. Ltd. Economic and Technological Research Institute Nanjing China

ISBN: (纸本)9781665407380

This paper takes close research on the impact of unbalanced faults in the occurrence of Commutation Failure (CF) in LCC-HVDC inverters, by finding the probability of CF with the phase shift that takes place in case of unbalanced faults. The analyses of the unbalanced system are conducted by using sequence components, a relationship between the phase shift and unbalance ratio is implemented to describe the degree of unbalance in the system. The unbalance ratio is used to quantify the amount of the phase shift that will cause CF in the system, and the probability of CF with respect to unbalance ratio is obtained. Moreover, a mathematical model is implemented to calculate the critical amount of unbalance degree that will cause CF in the system, with different faults applied, the relationship between commutation failure and phase shift is obtained. The mathematical model is verified using PSCAD/EMTDC.

关键词： Fault diagnosis Mathematical models Inverters power systems

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Robust Integrated Optimization of Active Distribution Network Based on system Risk Index

Robust Integrated Optimization of Active Distribution Networ...

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3rd IEEE Student Conference on Electrical Machines and systems (SCEMS)

作者： Zhang, Yumin Gao, Haishu Ji, Xingquan Liu, Qi Yu, Yixiao Shandong Univ Sci & Technol Coll Elect Engn & Automat Qingdao Peoples R China Tianjin Univ Key Lab Smart Grid Minist Educ Tianjin Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9781728156224

This paper presents a comprehensive distribution robust optimization model based on the distribution network risk index to address the distributional uncertainties of distributed generations (DGs) and loads. To analyze the security of active distribution network (ADN) systematically, a risk assessment method based on improved semi-invariant method and clustering technique is proposed. The risk assessment method is performed on the integrated dynamic reconfiguration and reactive power optimization model. This method can consider the correlation between distributed power sources, and when the injected power is large, the calculation results with higher accuracy can be obtained Case studies on the PG&E 69-bus system verify the robustness and feasibility of the proposed model.

关键词： active distribution network distributional robust optimization probability distribution risk assessment

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A Fast DC Line Protection for MMC-MTDC Grids Based on PSVTWs

A Fast DC Line Protection for MMC-MTDC Grids Based on PSVTWs

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IEEE-power-and-Energy-Society General Meeting (PESGM)

作者： Zhang, Shuo Zou, Guibin Huang, Qiang Gao, Houlei Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

ISBN: (纸本)9781728119816

This paper proposes a fast non-unit direct current (DC) line protection for modular multilevel converter (MMC)-based multiterminal high voltage direct current (MTDC) grids based on positive-sequence voltage traveling waves (PSVTWs). The propagation characteristics of voltage traveling waves (VTWs) are first analyzed to obtain the transfer functions of PSVTWs from the fault location to the relay location under typical internal and external faults. By comparing the transfer functions in frequency domain, the protection criterion is developed. In addition, the method to obtain the protection threshold is presented in this paper, which is independent on simulation. The performance of the protection is verified by extensive simulations in PSCAD/EMTDC software.

关键词： multi-terminal high voltage direct current (MTDC) grid modular multilevel converter (MMC) fast line protection positive-sequence voltage traveling wave (PSVTW) wavelet transform modulus maximum (WTMM)

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Fault property identification method and application for MTDC grids with hybrid DC circuit breaker

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2019年第Sep.期110卷 136-143页

作者： Zhang, Shuo Zou, Guibin Li, Bowei Xu, Bin Li, Jun Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China State Grid Weihai Power Supply Co Weihai Peoples R China

In order to ensure that the healthy lines continue to operate after the line fault, the multi-terminal high voltage direct current (MTDC) grid based on half-bridge modular multilevel converter (HB-MMC) prefers to isolate the fault line using DC circuit breakers (DCCBs). Since most of overhead (OH) line faults are instantaneous faults, after the fault line is isolated, usually the DCCB will reclose with a certain delay to improve system stability. For fear of reclosing to permanent fault, this paper proposes a fault property identification (FPI) method suitable for MTDC grids with hybrid DCCBs (HDCCBs), which can distinguish between instantaneous and permanent faults. The method is based on the characteristic signal injected by the HDCCB with the auxiliary circuit. Besides, once a permanent fault has been determined, the method can also locate the fault position accurately. The effectiveness of the proposed FPI method is verified by extensive simulations in PSCAD/EMTDC platform.

关键词： Multi-terminal high voltage direct current (MTDC) grid Hybrid DC circuit breaker (HDCCB) Fault property identification (FPI) Overhead (OH) line Fault location

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An Online Generator Start-Up Algorithm for Transmission system Self-Healing Based on MCTS and Sparse Autoencoder

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IEEE TRANSACTIONS ON power systemS 2019年第3期34卷 2061-2070页

作者： Sun, Runjia Liu, Yutian Wang, Liang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250100 Shandong Peoples R China Shandong Elect Power Dispatching & Control Ctr Jinan 250001 Shandong Peoples R China

Generator start-up is a pivotal step of transmission system self-healing after large-scale blackouts. Considering the uncertainty of initial power system situation after blackouts and line restoration during power system restoration, an online generator start-up algorithm based on Monte Carlo tree search (MCTS) and sparse autoencoder (SAE) is proposed for real-time decision making. First, an online decision support system and a generator start-up efficiency indicator involving the total generation capability and number of restored lines are proposed. Then, the SAE is deployed to learn the data relevant to generator start-up offline to establish a value network, which is used to rapidly estimate the optimal generator start-up efficiency indicator. Next, MCTS used for the online generator start-up is improved by the modified upper confidence bound apply to tree algorithm, move pruning technique, and value network. It is used to search the next line to be restored based on real-time situation. Finally, root parallelization computation is adopted and a decision-makingmethod is proposed to improve the reliability of decision making. Simulation results of the New England 10-unit 39-bus power system and Western Shandong power Grid of China demonstrate that the proposed algorithm can accomplish generator start-up step by step reliably.

关键词： Deep learning Monte Carlo tree search power system restoration self-healing

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Optimal coordinated control of steady-state voltage stability in AC/DC systems incorporating VSC-HVDC

Optimal coordinated control of steady-state voltage stabilit...

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The 16th IET International Conference on AC and DC power Transmission (ACDC 2020)

作者： O. Sha W. Zhang Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan 250061 China

With the increasing use of VSC-HVDC links, voltage stability control has become a vital issue in AC/DC power systems. This paper proposes an optimal coordinated control (OCC) method in AC/DC systems incorporating VSC-HVDC to exploit the ability of VSC-HVDC to enhance steady-state voltage stability. First, this paper extends L-index to AC/DC systems incorporating VSC-HVDC. Then based on this, two kinds of optimal coordinated control are proposed respectively for voltage deviation correction and voltage stability enhancement. The optimal coordinated control is modelled as a linearly constrained quadratic programming problem based on sensitivity, which can get a solution quickly. The model considers characteristics of different controllable variables so it can coordinate the controllable resources of a power system. Furthermore, based on the proposed optimal coordinated control, a control strategy is designed which can jointly ensure voltage stability margin and maintain voltage magnitude in a reasonable range. In this way, the ability of VSC-HVDC systems participating in voltage stability control is fully exploited. The result of the simulation on modified New England 39-bus power system shows that the proposed method can comprehensively coordinate control variables and effectively enhance voltage stability.

关键词： power system stability HVDC power convertors voltage control quadratic programming voltage regulators control system synthesis AC-DC power convertors voltage-source convertors optimal control

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Single-ended line protection for MMC-MTDC grids

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IET GENERATION TRANSMISSION & DISTRIBUTION 2019年第19期13卷 4331-4338页

作者： Zhang, Shuo Zou, Guibin Huang, Qiang Xu, Bin Li, Jun Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China State Grid Weihai Power Supply Co Weihai Peoples R China

This study proposes a novel non-unit line protection for modular multilevel converter-based (MMC) multi-terminal high-voltage direct current (MTDC) grids. On the basis of the symmetrical component analysis, the initial values of positive-sequence voltage travelling waves (PSVTWs) generated by the fault are first investigated. Then, according to the TW theory and the inherent composition of the primary equipment of MMC-MTDC grids, the initial values of PSVTWs on both sides of the series inductor are obtained in Laplace domain. Moreover, a fast fault line protection based on the positive-sequence voltage on the series inductor at the line terminal is proposed. Besides, the method of the protection threshold determination is elaborated and is independent of simulation. Finally, extensive simulation studies are carried out in a four-terminal MMC-MTDC grid. Simulation results show the effectiveness of the proposed line protection method.

关键词： power transmission faults power transmission protection HVDC power convertors power grids power transmission lines voltage-source convertors power inductors fault diagnosis single-ended line protection novel nonunit line protection modular multilevel converter-based multiterminal high-voltage direct current grids symmetrical component analysis initial values positive-sequence voltage series inductor fast fault line protection line terminal protection threshold determination four-terminal MMC-MTDC grid PSVTW Laplace domain

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Distributed Risk-Limiting Load Restoration in Unbalanced Distribution systems With Networked Microgrids

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IEEE TRANSACTIONS ON SMART GRID 2020年第6期11卷 4574-4586页

作者： Shen, Feifan Wu, Qiuwei Zhao, Jin Wei, Wei Hatziargyriou, Nikos D. Liu, Feng Tech Univ Denmark Ctr Elect Power & Energy Dept Elect Engn DK-2800 Lyngby Denmark Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250000 Peoples R China Tsinghua Univ Dept Elect Engn State Key Lab Power Syst Beijing 100084 Peoples R China Natl Tech Univ Athens Sch Elect & Comp Engn Athens 15773 Greece

To enhance the resilience of distribution systems (DSs), networked microgrids (MGs) can be employed to restore critical loads after a blackout. However, uncertainties of renewable energy sources (RESs) and loads bring challenges to load restoration. This paper proposes a distributed risk-limiting load restoration strategy for unbalanced DS with networked MGs. In the proposed strategy, the risk is represented by the conditional value-at-risk (CVaR), based on which a risk-limiting load restoration model is formulated considering renewable and load uncertainties. With the projection function-based alternating direction method of multipliers (P-ADMM) and sub-additivity of the CVaR, the proposed risk-limiting model is decoupled and solved in a distributed manner. This enables distributed risk limiting among MGs. Each MG can make load restoration decisions individually, while ensuring that the risk-limiting constraints of the overall system are satisfied. The modified IEEE 123-node system with networked MGs was used to conduct case studies. Simulation results show that the proposed strategy can restore loads efficiently with a smaller risk index and can provide distributed and flexible risk management. Moreover, the proposed distributed strategy can reduce the computation burden and is more robust against controller failures compared with the centralized strategy.

关键词： Load modeling Uncertainty Optimization Convex functions Voltage control Limiting Electronic mail Alternating direction method of multipliers (ADMM) conditional value-at-risk (CVaR) distribution systems distributed energy resources (DERs) load restoration microgrids

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