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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Fang Peng Houlei Gao Weiying Miao Xinchi Feng Bin Xu Yitong Wu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Substation Maintenance Center State Grid Hangzhou Power Supply Company Hangzhou China State Grid Nanjing Power Supply Company Nanjing China School of Electrical Engineering Shandong University Jinan China

With the characteristics of low loss, low harmonic content and large transmission capacity, voltage source converter based high voltage direct current transmission (VSC-HVDC) has become the focus of the development for large-capacity and long-distance power transmission system connected with offshore wind farms. However, since the power supplies on both sides are controlled, the fault characteristics are changed, and the performance of the traditional distance protection is influenced. Based on the control strategy, the amplitude and phase angle of the equivalent positive and negative sequence impedances at the two sides of the transmission line are analyzed, and the current phasor expressions of the wind farm side and the VSC-HVDC side of the faulted line are derived. Then the adaptability of distance protection using power frequency component (DPPFC) of transmission line for VSC-HVDC-connected offshore wind farm is analyzed under different fault conditions. The results show that the amplitude and phase angle of the equivalent positive and negative sequence impedances of the wind farm and the VSC-HVDC system are affected by the control strategy of the converter and the fault conditions. The DPPFC is not suitable for VSC-HVDC-connected offshore wind farm system. The ability to avoid the effect of fault resistance of the DPPFC at the wind farm side gets worse. The simulation conducted by EMTP-RV verifies the effectiveness of the analysis.

关键词： Resistance Analytical models power transmission lines power transmission Wind farms Propagation losses power conversion

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Simulation of Fast Cascading Failures Considering Voltage Ride Through Capability of Renewable Generation

Simulation of Fast Cascading Failures Considering Voltage Ri...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Dongbao Lv Shanshan Qiu Yujun Zhou Changgang Li Junjun Yang Wei Xu Xing Lei Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the rapid development of renewable generation, the evolution process of fast cascading failures in the power system with a high proportion of renewable generation turns out to be more complicated. There are few existing fast cascading failure models that take into account the voltage ride through (VRT) capability of renewable generation. The portrayal of the dynamic characteristics of renewable generation still needs to be improved. In response to this, the VRT control model and VRT protection model have been established to comprehensively depict the output characteristics and disturbance tolerance capability of renewable generation in fast cascading failures. Finally, the simulation results of the AC-DC hybrid receiving-end system with a high proportion of renewable generation show that the established models can effectively depict the influence of VRT capability of renewable generation in fast cascading failures, providing a more comprehensive basis for the analysis of fast cascading failures under the access of a high proportion of renewable generation.

关键词： Renewable energy sources Voltage fluctuations Simulation power system protection power system dynamics system integration Delays power system faults Voltage control Transient analysis

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Effective Open-Loop Process Based Stability Criterion for Wide-Band Oscillation

Effective Open-Loop Process Based Stability Criterion for Wi...

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2020 IEEE/IAS Industrial and Commercial power system Asia, I and CPS Asia 2020

作者： Qi, Bin Gao, Lei Ye, Hua Sun, Huadong Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China China Electric Power Research Institute Power System Department Beijing China

ISBN: (纸本)9781728143033

Wide-band oscillation arising in grid-connected doubly-fed induction generator (DFIG) systems became increasingly prominent. To address this problem, a stability criterion for wide-band oscillation of power grid-connected DFIG system is proposed based on effective open-loop process (EOP) theory. First, the coupled multi-input multi-output (MIMO) model of grid-connected DFIG system is established based on synchronous reference frame (SRF). Second, the reference frame of grid-connected DFIG system model is transformed by linear transformation, and then the transformed MIMO system is decoupled into two decoupled single input single output (SISO) systems using EOP theory. The mathematical expression of system's stability criterion is derived based on the equivalent SISO models. Finally, the correctness of the proposed stability criterion is validated by time-domain simulation. © 2020 IEEE.

关键词： Stability criteria

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Evaluation of Damping of Generator by Using Oscillation Energy

Evaluation of Damping of Generator by Using Oscillation Ener...

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2020 IEEE/IAS Industrial and Commercial power system Asia, I and CPS Asia 2020

作者： Zhu, Hanxing Ye, Hua Gao, Lei Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China China Electric Power Research Institute Power System Department Beijing China

ISBN: (纸本)9781728143033

Evaluating damping of generators is beneficial for improving the stability of the power system. The existing damping evaluation methods based on the sixth-order generator model are strongly rely on detailed parameters which are not easy to obtain. To address this problem, a damping evaluation method using oscillation energy and small signal analysis is proposed, the method can evaluate the damping of the sixth-order generator model based on electric parameters. First, the oscillation energy that flow into the sixth-order generator model based on electric parameters is deduced and corresponding equivalent circuits is also given. Second, a damping evaluation index based on oscillation energy is proposed, and then the express of index is given by eigenvector and eigenvalue. Finally, simulation result of a 4-machine system demonstrates the validation of the proposed method for damping evaluation. © 2020 IEEE.

关键词： Damping

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Real-time coordinated control of long-term voltage stability in power grid with VSC-MTDC considering time response characteristics of components

Real-time coordinated control of long-term voltage stability...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Gong, Shuai Zhang, Wen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education School of Electrical Engineering Jinan China

ISBN: (纸本)9781728155081

Considering power grid with VSC-MTDC(Voltage Source Converter based Multi-terminal DC) and time response characteristics of components, a real-time coordinated control method of long-term voltage stability in AC/DC power grid is proposed. Firstly, the control components of AC/DC system considering time response characteristics are established, and then based on trajectory sensitivity, a receding horizon optimization of model predictive control (MPC) is established with the objective of minimizing the deviation of voltage trajectories, the control cost, reactive power margin sharing of generators, and reactive power of VSC-MTDC. According to the recovery of the lowest voltage of the system, different reactive power strategies are proposed. The simulation results of AC/DC hybrid system show that the control method proposed in this paper can fully coordinate all kinds of control means of AC/DC system, improve the long-term voltage stability of the system, and optimize the reactive power of the system. © 2020 IEEE.

关键词： Model predictive control

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A Hierarchical Inertial control Scheme for Multiple Wind Farms With BESSs Based on ADMM

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IEEE TRANSACTIONS ON SUSTAINABLE ENERGY 2021年第2期12卷 751-760页

作者： Bao, Weiyu Wu, Qiuwei Ding, Lei Huang, Sheng Terzija, Vladimir Shandong Univ Sch Elect Engn Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Tech Univ Denmark DTU Ctr Elect Power & Energy CEE Dept Elect Engn DK-2800 Lyngby Denmark Univ Manchester Sch Elect & Elect Engn Manchester M13 9PL Lancs England

Wind farms (WFs) can provide inertial response to power systems through synthetic inertial control. In large scale power systems with high penetration level of wind power, WFs are located in different areas with different wind speed conditions, and it is necessary to coordinate them during inertial control. This paper proposes a hierarchical inertial control (HIC) scheme consisting of a WF level coordination and a wind turbine (WT)/battery energy storage system (BESS) level coordination in active power outputs during inertial control process, in order to improve the system frequency response and reduce the operational cost of each WF. First, the optimal active power references of multiple WFs during inertial control are determined to improve the frequency nadir of the system. Second, the active power references of the WTs/BESS of each WF is optimized to avoid over-deceleration of the WTs' rotor, and minimize the wind energy loss and degradation cost of the BESS. The optimization is achieved by developing a model predictive control (MPC) problem and solving it using the alternating direction method of multipliers (ADMM) to improve the computation efficiency. Simulations on 5 WFs integrated into IEEE 39-bus system were conducted to validate the proposed HIC scheme.

关键词： Hierarchical control inertial control wind farm (WF) system frequency response

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Hierarchical Optimal control for Synthetic Inertial Response of Wind Farm Based on Alternating Direction Method of Multipliers

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IEEE TRANSACTIONS ON SUSTAINABLE ENERGY 2021年第1期12卷 25-35页

作者： Huang, Sheng Wu, Qiuwei Bao, Weiyu Hatziargyriou, Nikos D. Ding, Lei Rong, Fei Tech Univ Denmark DTU Ctr Elect Power & Energy CEE Dept Elect Engn DK-2800 Lyngby Denmark Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Natl Tech Univ Athens Athens 15780 Greece Hunan Univ Coll Elect & Informat Engn Changsha 410082 Peoples R China

An ADMM-based hierarchical optimal active power control (HOAPC) scheme is proposed for synthetic inertial response of large-scale wind farms. The proposed scheme coordinates the active power outputs of wind turbines (WTs) inside the wind farm during the synthetic inertial response process, aiming to minimize the differences in the rotor speed of the WTs and the wind energy loss caused by the decrease in the rotor speed of the WTs. The optimal control is formulated based on the model predictive control (MPC) according to the local WT wind conditions. A hierarchical solution method based on the alternating direction method of multipliers (ADMM) is developed to solve the MPC-based optimization problem in a fast way without the loss of optimality. With the HOAPC, the wind farm controller guarantees the rotor speed stability of WTs inside the wind farm and reduces the wind energy losses during the synthetic inertial response process. Moreover, the optimization problem is decomposed to several optimization subproblems solved in parallel. As such, the computation burden of the wind farm central controller is significantly reduced, and the protection of the information privacy of the wind farm is improved. A wind farm with 100 WTs was used to validate the proposed HOAPC scheme.

关键词： Wind farms Rotors Optimization Optimal control Frequency control power system dynamics Alternating direction method of multiplier (ADMM) hierarchical control model predictive control (MPC) synthetic inertial response wind farm

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Distributed optimization for network-constrained peer-to-peer energy trading among multiple microgrids under uncertainty

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2023年第1期149卷

作者： Wang, Luhao Wang, Zhuo Li, Zhengmao Yang, Ming Cheng, Xingong Univ Jinan Sch Elect Engn Jinan 250022 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn 50 Nanyang Ave Singapore 639798 Singapore Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

This paper addresses network-constrained peer-to-peer (P2P) energy trading problems for multiple microgrids (MGs) under uncertainty. A bi-level distributed optimization framework is proposed to bridge the gap between physical power flows supervised by distribution system operators and logical P2P transactions among multiple MGs under uncertainty. At the upper level, a conditional optimal power flow model is formulated to minimize power losses and guarantee the operating security of local distribution networks. At the lower level, a stochastic programming-based P2P trading model for multiple MGs is formulated to pursue the flexibility of energy transactions among different entities. To realize the consistency of decision-making processes between the two levels and among different MGs, a nested bi-level distributed algorithm including a parallel analytical target cascading algorithm and an alternating direction multiplier method is designed to solve the proposed model in a distributed manner. Furthermore, an adaptive updating method for penalty parameters is adopted to decrease the sensitivity to the initialization. Finally, numerical tests are implemented in a modified IEEE 33-node distribution network with four MGs to testify to the validity of the proposed energy trading framework. The results confirm that the obtained P2P trading schemes can protect against uncertainties and satisfy network constraints, especially since the proposed parallel distributed algorithm has better computing performances compared to the traditional sequential distributed algorithm.

关键词： Multiple microgrids (MGs) Peer-to-peer (P2P) energy trading Uncertainty Optimal power flow (OPF) Distributed optimization

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A partial solution operator discretization-based method for small signal stability analysis of time-delay power systems

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2022年 134卷 107327-107327页

作者： Mou, Qianying Ye, Hua Liu, Yutian Xu, Yan Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control 17923 Jingshi Rd Jinan 250061 Peoples R China

To analyze the small signal stability of large-scale time-delay power systems (TDPSs), critical oscillation modes are required to be reliably computed. The solution operator discretization with pseudo-spectral collocation (SODPS)-based method has been proposed to indirectly calculate critical eigenvalues from the solution operator's discretization matrix. However, dimension of the discretization matrix is dozens of times the number of system state variables, and thus limits the efficiency of SOD-PS. To resolve this, SOD-PS is evolved into partial SOD-PS (PSOD-PS) in this paper by applying the idea of partial spectral discretization (PSD). Specifically, only the discretization of retarded states is reserved instead of discretizing all system states in delay interval. The resultant partial discretization matrix exhibits very low order, which is close to the number of system state variables. In addition, the rotation-and-multiplication preconditioning technique is studied to efficiently capture oscillation modes with damping ratios less than the given threshold. Specifically, the preconditioning technique is implemented by two ways and their consistency is derived in detail. Both theoretical analyses and intensive tests on the 16-machine 68-bus test system, a real-life 516-bus provincial transmission system of China and the 33028-bus ultra-high-voltage (UHV) interconnected system of China verify the accuracy and efficiency of the presented PSOD-PS.

关键词： Eigen-analysis Partial spectral discretization Small signal stability Solution operator Time delay

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A review on application of machine learning-based methods for power system inertia monitoring

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2024年 162卷

作者： Heidari, Mahdi Ding, Lei Kheshti, Mostafa Bao, Weiyu Zhao, Xiaowei Popov, Marjan Terzija, Vladimir Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Univ Warwick Sch Engn Intelligent Control & Smart Energy ICSE Res Grp Coventry CV4 7AL England Delft Univ Technol Fac EEMCS Mekelweg 4 NL-2628CD Delft Netherlands Newcastle Univ Sch Engn Newcastle Upon Tyne NE1 7RU England

The modernization of electrical power systems is reflected through the integration of renewable energy resources, with the ultimate aim of creating a carbon-neutral world. However, this goal has brought new and complex challenges for the power system, with one of the most crucial issues which is the reduction of system inertia. The decrease in system inertia has led to severe difficulties in maintaining frequency stability. As a result, power system operators must continuously monitor the system inertia and when necessary to activate appropriate preventive measures, ensuring a reliable and secure operation of the power system. Fortunately, wide-area monitoring systems can provide the necessary measurements to monitor and analyze system behavior, assisting system operators in undertaking optimal actions. This paper provides a review of recent publications that apply machine learning (ML)-based methods for monitoring power system inertia. It also provides an overview of academic and industrial projects related to ML-based methods for inertia monitoring. Furthermore, the paper explores applications based on ML-based methods and inertia. Lastly, the paper briefly discusses future directions for the development of this research field. (c) 2017 Elsevier Inc. All rights reserved.

关键词： Converter interfaced generation Frequency stability Inertia monitoring Machine learning Synchronous generators system inertia

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