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arXiv 2023年

作者： Xiao, Tannan Chen, Ying Diao, Han Huang, Shaowei Shen, Chen State Key Laboratory of Power System Operation and Control Tsinghua University Beijing10084 China Department of Electrical Engineering Tsinghua University Beijing100084 China

power system optimal dispatch with transient security constraints is commonly represented as Transient Security-Constrained Optimal power Flow (TSC-OPF). Deep Reinforcement Learning (DRL)-based TSC-OPF trains efficient decision-making agents that are adaptable to various scenarios and provide solution results quickly. However, due to the high dimensionality of the state space and action spaces, as well as the non-smoothness of dynamic constraints, existing DRL-based TSC-OPF solution methods face a significant challenge of the sparse reward problem. To address this issue, a fast-converging DRL method for TSC-OPF is proposed in this paper. The Markov Decision Process (MDP) modeling of TSC-OPF is improved by reducing the observation space and smoothing the reward design, thus facilitating agent training. An improved Deep Deterministic Policy Gradient algorithm with Curriculum learning, Parallel exploration, and Ensemble decision-making (DDPG-CPEn) is introduced to drastically enhance the efficiency of agent training and the accuracy of decision-making. The effectiveness, efficiency, and accuracy of the proposed method are demonstrated through experiments in the IEEE 39-bus system and a practical 710-bus regional power grid. The source code of the proposed method is made public on GitHub. Copyright © 2023, The Authors. All rights reserved.

关键词： Deep reinforcement learning

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Optimal Reactive power Adjustment Based on Jacobi Matrix Decomposition

Optimal Reactive Power Adjustment Based on Jacobi Matrix Dec...

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China International Electrical and Energy Conference (CIEEC)

作者： Shihao Zou Lei Yu Yongji Cao Hengxu Zhang Tao Zhou Ruicong Ma Jifei Wang Xinyu Zhang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China State Grid Zhangjiakou Electric Power Company State Grid Jibei Electric Power Company Zhangjiakou China Academy of Intelligent Innovation Shandong University Jinan China

To solve the problem of excessive reactive power and high voltage caused by renewable energy connection and the increase of the proportion of cables, a reactive power optimization approach based on the Jacobi matrix decomposition is proposed. The voltage sensitivity is obtained based on the Jacobi matrix decomposition. The reactive power resources sensitivity and reactive power network loss sensitivity are combined to determine the buses where the reactive power adjustment is carried out. The scheme of reactive power optimization that meets the voltage adjustment requirements is obtained through an iterative convergence calculation method. An urban power system is taken as the case study, which shows that the proposed method can optimize the reactive power voltage optimization effectively.

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Coupling between automatic generation control and automatic voltage regulator while considering generation rate constraint of two areas 2

Coupling between automatic generation control and automatic ...

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2nd International Conference on Advanced Electrical and Energy systems, AEES 2021

作者： Elmukhtar, Omer Zhang, Jianhua Department of computer science and control engineering North China Electric Power University Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

This paper describes the implementation of automatic generation control (AGC) and automatic voltage regulator (AVR) under generation rate constraint (GRC) and coupling between automatic generation control and automatic voltage regulator while considering generation rate constrain of two areas for improve and better performance characteristic of load frequency control (LFC) problem. our control aim has to normalize the area control error (ACE), frequency error and tie-line power error in spite of the presences of system uncertainties and external load disturbance, So that the required frequency and power interchange with adjacent structures are maintained in order to reduce the transient deviations and to provide zero steady state error in proper short time, the behavior of the planned is checked by MATLAB SIMULINK software. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Voltage regulators

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Dc Fault Ride-Through control for Mmc-Hvdc Grid-Connected Wind Farm Based on Energy Storage system

SSRN

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SSRN 2023年

作者： Sun, Yinfeng Guo, Yuhang Lu, Yuze Lu, Mingzhi Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China State Grid Shijiazhuang Gaocheng District Electric Supply Company No. 76 Changsheng South Street Gaocheng District Shijiazhuang052160 China

Large wind farms connected to the grid through MMC-HVDC systems can cause overloading of the non-faulty converter station after a DC fault. This short communication proposes a system fault ride-through method by coordinating and controlling the energy storage system, the non-faulty converter station and the wind farm to jointly consume the unbalanced power during the fault. The model is created in the PSCAD simulation platform, and the correctness and effectiveness of the method are verified by simulation. © 2023, The Authors. All rights reserved.

关键词： Energy storage

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Optimal multi-time scale coordination method for electricity-heating integrated energy system scheduling

Optimal multi-time scale coordination method for electricity...

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2020 International Conference on Smart Grid and Energy Engineering, SGEE 2020

作者： Lin, Zhuoran Wang, Shouxiang Wang, Shaomin Han, Aoyang Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin300072 China Tianjin Key Laboratory of Power System Simulation and Control Tianjin University Tianjin300072 China State Grid Qingdao Electric Supply Company Qingdao Shandong266000 China

Considering that different energy subsystems have different control characteristics in equipment operations, an optimal multi-time scale coordination method for electricity-heating integrated system scheduling is proposed. It merges three optimal scheduling models based on three-time scales of day-ahead, rolling, and real-time. The coordinated optimization of electricity and heating energies with the same dispatch instruction is fulfilled in day-ahead scheduling. And all feasible scheduling instruction cycles are traversed in the rolling stage to improve the stability of system economic operation. The calculation examples show that the proposed overall strategy for multi-time scale scheduling can achieve multi-energy complementarity, and the optimization results have less deviation from the actual load. © Published under licence by IOP Publishing Ltd.

关键词： Scheduling

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Dc Fault Ride-Through control for Mmc-Hvdc Grid-Connected Wind Farm Based on Energy Storage system

SSRN

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SSRN 2023年

作者： Sun, Yinfeng Guo, Yuhang Lu, Yuze Lu, Mingzhi Key Laboratory of Modern Power System Simulation and Control& Renewable Energy Technology Ministry of Education [Northeast Electric Power University Jilin132012 China State GridShijiazhuang Gaocheng District Electric Supply Company No. 76Changsheng SouthStreet Gaocheng District Shijiazhuang052160 China

关键词： Energy storage

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Advanced Out-of-Step Splitting Protection simulation Platform with Considering High Frequency Generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

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power systems and Electrical Technology (PSET), IEEE International Conference on

作者： Ren Liu Yukun Zhu Yihua Zhu Dongxu Chang Mingkang Wu Libin Huang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results.

关键词： Performance evaluation Industries Hardware-in-the-loop simulation Load shedding Real-time systems power grids High frequency

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Multi-field Coupling and state Identification of Grounding Transformers with GIC/HVDC Ground Current Intrusion

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Gaodianya Jishu/High Voltage Engineering 2025年第5期51卷 2349-2362页

作者： Pan, Chao Shi, Xiaobo Liu, Chunming Sun, Zhenglong Luo, Yuanxiang An, Jingge Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China School of Electrical & Electronic Engineering North China Electric Power University Beijing102206 China

Geomagnetically induced current (GIC) generated by geomagnetic storm and ground current generated by the monopolar operation of high voltage direct current (HVDC) system invade the grid grounding transformers, resulting in magnetic bias anomaly. To address this issue, the time-domain fluctuation features of ground currents under GIC/HVDC scenarios are comparatively analyzed. A multi-physics coupling model of transformer considering the ground currents intrusion is proposed, and physical feature information such as current, flux, electromagnetic force, vibration, and noise in various fields are extracted. The influences of GIC/HVDC ground current on propagation features are simulated and analyzed under the typical scenes, and the coupling relationships of physical features are summarized. Furthermore, the disturbance differences between GIC and HVDC ground current are compared. The results show that the impact of HVDC ground current on transformers is relatively stable, while GIC induces more complex temporal fluctuations in multi-field feature parameters. A dynamic experimental platform is built to measure the current, vibration, and noise data of transformer under different modes, then the correctness and effectiveness of the proposed model and conclusions are verified by comparing experiments and simulations. Finally, the multimodal feature information domains are constructed based on virtual-real consistency, and the disturbance level is used as the key criterion to divide the operation risk states. When the disturbance level reaches 1.5, the disturbance current leads to instability in the electromagnetic and mechanical environment inside the transformer. This method can be adopted to effectively identify the operational risk states of transformers under GIC/HVDC ground current intrusion scenarios, providing a basis for transformer fault identification and equipment protection. © 2025 Science Press. All rights reserved.

关键词： Transformer protection

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Design and Application Research of Synchronous Temporary Block Function between Valve Groups on Modular Multilevel Converter Ultra High Voltage Direct Current system

Design and Application Research of Synchronous Temporary Blo...

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Sustainable power and Energy Conference (iSPEC)

作者： Qinlei Chen Xuehua Lin Zhijiang Liu Qi Guo Libin Huang Guanming Zeng Shuyong Li Deyang Chen Chao Luo Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid Guangzhou China State Key Laboratory of HVDC China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665485234

Compared with the half controlled power electronic devices such as thyristor, the over-current ability of fully controlled power electronic devices such as insulated gate bipolar transistor (IGBT) is weak. In order to ensure that bridge arm current does not exceed the bearing range of modular multilevel converter (MMC) switching devices under AC fault ride through and other scenarios, MMC high voltage direct current (HVDC) system projects are equipped with temporary block (TB) function, IGBTs are protected by suspending the trigger pulse before bridge arm current reaches the maximum safe current of the switch. The structure of high side and low side valve group (VG) in series are adopted in ultra high voltage direct current (UHVDC) system. For line commuted converter (LCC) UHVDC system, the converter is current source type, During normal operation, there is no need to control the voltage balance between high side and low side VG, and after one VG is disturbed by commutation failure, the impact on another VG is relatively small. For MMC-UHVDC system, the converter is voltage source type, during normal operation, the voltage balance between high side and low side VG should be controlled. When a transient disturbance such as AC fault occurs, if one VG is temporary blocked due to bridge arm over-current, and another VG is not temporary blocked or the time of temporary blocked is later, the VG blocked first may tripped due to sub-module (SM) overall over-voltage or bridge arm over-current, and the scope of the accident is expanded, which is not conducive to the flexible and reliable operation of MMC-UHVDC. Therefore, the impact of non synchronous temporary block of MMC-UHVDC VGs is firstly analyzed in this paper, and then synchronous temporary block (STB) function between VGs is proposed, and the hardware interface scheme, STB signal sending and receiving logic, enable conditions and other aspects between VGs are elaborated. Finally, taking kunliulong project, the world’

关键词： Insulated gate bipolar transistors Multilevel converters Bridge circuits High-voltage techniques Switches Valves Real-time systems

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Method for Selecting Optimal Access Point of Offshore Wind Farm Integrated by VSC-HVDC 6

Method for Selecting Optimal Access Point of Offshore Wind F...

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6th International Conference on power and Renewable Energy, ICPRE 2021

作者： Tan, Zukuang Liu, Yutian Liu, Xiaoming Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China Economic and Technology Research Institute State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9781665449618

Because of the rapid growth of offshore wind farm (OWF) capacity, voltage-source-converter-based high-voltage direct-current (VSC-HVDC) transmission scheme is becoming a competitive transmission scheme. This paper presents a method for selecting the optimal access point of offshore wind farm integrated with VSC-HVDC. The method takes into account capability of wind power accommodation, voltage support from onshore VSCs, voltage fluctuation caused by the change of wind power, vulnerability of power system transmission networks, and construction costs. This multi-objective decision-making problem is suggested to be solved based on the theory of information entropy and fuzzy analytic hierarchy process (FAHP) method. The method is applied in Shandong Province where is developing offshore wind power rapidly to select an optimal access point by the use of PSS/E. The results demonstrate the effectiveness of the proposed method for selecting the access point of the OWF. © 2021 IEEE.

关键词： Offshore wind farms

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