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Active power Coordination for a Large Population of Grid-Forming and Grid-Following Inverters Based on Mean Field Games Theory

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IEEE ACCESS 2023年 11卷 90052-90064页

作者： Xu, Nuo Chu, Xiaodong Ye, Hua Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250100 Peoples R China

In a grid with a high proportion of renewable energy, the coordinated control between grid-forming (GFM) and grid-following (GFL) inverters becomes crucial for maintaining aspects such as frequency and voltage regulation. This paper presents a decentralized competitive power coordination scheme, designed for a large-scale networked inverter system based on the Mean Field Games (MFG) concept. This scheme effectively harmonizes GFM and GFL inverters to achieve both frequency recovery and active power distribution within the distribution network. Each inverter devises its optimal active power control strategy by maximizing a frequency-constrained revenue function. Through the market price, each inverter's control strategy influences others' strategies. Importantly, this scheme simplifies the interaction among inverters by averaging the impacts generated by each inverter's control strategies. For the MFG control scheme, a decentralized policy iteration algorithm is proposed, eliminating the need for information exchange between inverters and significantly decreasing the communication burden. The effectiveness of the proposed control framework is corroborated using the IEEE 33 test system.

关键词： Active power coordination frequency regulation grid-forming grid-following mean field games

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Probabilistic Forecast of Wind power in High Wind Scenarios of Cold Wave Weather 7

Probabilistic Forecast of Wind Power in High Wind Scenarios ...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Zhou, Haoyang Yang, Ming Yu, Yixiao Li, Menglin Wang, Chuanqi Zhang, Yuanhe Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9798350345094

As the proportion of installed renewable energy in the power system increases, the weather attributes of the new power system become more and more. and the current meteorological changes are becoming more and more complex, with frequent occurrence of cold wave weather, triggering large fluctuations in wind power output. The traditional wind power forecast method is difficult to adapt to the cold wave weather scenario. The large deviation of the forecast brings a great challenge to the wind power consumption. In this paper, we analyze the characteristics of wind power forecast error fluctuation and the mechanism of error generation based on wind power forecast and measured data during cold wave weather. On this basis, we extract the wind power data and numerical weather prediction data under the cold wave weather, and select the strong correlation meteorological factors based on the Pearson correlation coefficient to determine the inputs of the forecast model. Use the generative adversarial network algorithm to expand the samples, so the wind power dataset under the cold wave weather is constructed. Finally, the quantile regression wind power probabilistic forecast model based on the support vector machine is constructed, and an example is set up to verify the effectiveness of the proposed method. © 2023 IEEE.

关键词： Wind power

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Grid Strength Assessment Method for Evaluating Small-signal Synchronization Stability of Grid-following and Grid-forming Converters Integrated Systems

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Journal of Modern power Systems and Clean Energy 2025年第1期13卷 55-65页

作者： Qianhong Shi Wei Dong Guanzhong Wang Junchao Ma Chenxu Wang Xianye Guo Vladimir Terzija Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical EngineeringShandong UniversityJinan 250061China Electric Power Research Institute State Grid Zhejiang Electric Power Co.Ltd.Hangzhou 310014China School of Engineering Newcastle UniversityNewcastle upon TyneUK

Oscillations caused by small-signal instability have been widely observed in AC grids with grid-following(GFL)and grid-forming(GFM)*** generalized short-circuit ratio is commonly used to assess the strength of GFL converters when integrated with weak AC systems at risk of *** paper provides the grid strength assessment method to evaluate the small-signal synchronization stability of GFL and GFM converters integrated ***,the admittance and impedance matrices of the GFL and GFM converters are analyzed to identify the frequency bands associated with negative damping in oscillation modes dominated by heterogeneous synchronization ***,based on the interaction rules between the short-circuit ratio and the different oscillation modes,an equivalent circuit is proposed to simplify the grid strength assessment through the topological transformation of the AC *** risk of sub-synchronization and low-frequency oscillations,influenced by GFL and GFM converters,is then reformulated as a semi-definite programming(SDP)model,incorporating the node admittance matrix and grid-connected device *** effectiveness of the proposed method is demonstrated through a case analysis.

关键词： Grid-following converter grid-forming converter grid strength assessment small-signal stability

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Cooperative optimal operation of multi-microgrids and shared energy storage for voltage regulation of distribution networks based on improved Nash bargaining

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY SYSTEMS 2025年 166卷

作者： Zhang, keyu Chen, Jian Qi, Xianglong Zhang, Wen Wei, Meijia Lin, Da Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Zhejiang Elect Power Res Inst Hangzhou 310004 Peoples R China

The increasing penetration rate of distributed generation will bring serious voltage violation issues to the distribution networks (DNs). As an effective organization form of distributed generation, microgrids (MGs) have flexible adjustment ability, which can provide voltage support for DNs. To enhance the energy economy and scheduling flexibility of MGs, shared energy storage system (SESS) has received widespread attention as a new type of energy storage technology. To this end, this paper proposes a cooperative optimal operation strategy of MGs and SESS aimed at voltage regulation in DNs. A two-stage cooperative optimization model based on Nash bargaining theory is established for MGs and SESS. In the first stage, the DN is partitioned using an improved electrical distance approach that incorporates voltage regulation incentives, with the objective of minimizing the cooperation costs for MGs and SESS. The second stage involves quantifying the contributions of each participant through a nonlinear energy mapping function, followed by the development of the trading price based on asymmetric bargaining informed by improved Nash bargaining. The goal of this approach is to ensure that MGs and SESS share cooperative benefits fairly. The alternating direction method of the multiplier (ADMM) is used to solve the problems, effectively protecting the privacy of each participating subject. Finally, the effectiveness of the proposed method is demonstrated through an analysis of the improved IEEE 33-node system.

关键词： Distribution network partition Multi-microgrids Shared energy storage system Voltage regulation incentives Asymmetric Nash bargaining

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Quantitative assessment of static voltage stability for power system with high-penetration wind power based on energy function

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ENERGY REPORTS 2024年 12卷 699-707页

作者： Zhang, Jian Ma, Ruicong Cao, Yongji Zou, Shihao Li, Changgang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Shandong Univ Acad Intelligent Innovat Jinan 250101 Peoples R China

As the scale of power systems expands, the penetration of renewable energy sources and power electronic devices are accelerating. With the growing complexity of power system, there is an urgent need for in-depth research on the impact of reactive power on static voltage stability. This paper proposes a quantitative assessment approach of static voltage stability for the power system with high-penetration wind power based on the energy function. A quantitative assessment framework for voltage stability indices based on power flow analysis has been established. The classic static voltage stability index L based on reactive power has been comprehensively analyzed. Additionally, combining the energy function and power flow analysis, a new quantitative index for voltage stability based on bus reactive power injection has been proposed. Finally, the effectiveness of this index has been validated by case studies. With the increasing penetration of wind power, the trend of the change of the assessment index of voltage margin is analyzed.

关键词： Energy function power flow Quantitative assessment Static voltage stability Wind power

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Fault line selection algorithm for single-phase grounding faults in distribution networks based on multi-feature fusion of multi-level wavelet decomposition coefficients

Fault line selection algorithm for single-phase grounding fa...

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2024 International Conference on Electrical Technology and Automation Engineering, ETAE 2024

作者： Li, Jinyao Wu, Shouyuan Gao, Lixue Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Jinan250061 China

This paper introduces a novel method for determining fault lines, addressing the time-consuming nature of traditional steady-state quantity methods and the susceptibility to errors in transient quantity methods. A multi-feature fusion technique, involving multi-level wavelet decomposition coefficients, is employed. This involves the extraction of zero-sequence current wavelet transform coefficients with the Discrete Wavelet Transform (DWT), and the formation of a similarity function through the S-transform. Subsequently, an energy measure function is derived by integrating these coefficients. A function representing faultiness, aligned with various fault lines, is then developed and used as the primary criterion for identifying the faulted line. Simulation data from a single-phase grounding fault model in a distribution network confirms the efficacy of the method in choosing fault lines. © Published under licence by IOP Publishing Ltd.

关键词： Discrete wavelet transforms

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Coordinated voltage control of active distribution networks with photovoltaic and power to hydrogen

IET ENERGY SYSTEMS INTEGRATION

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IET ENERGY SYSTEMS INTEGRATION 2023年第3期5卷 245-260页

作者： Zhang, Yongxiang Chen, Jian Zhao, Haoran Zhang, Wen Jiao, Wenshu Dai, Wuzhen Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Peoples R China

The rapid increase of photovoltaic (PV) penetration in active distribution networks (ADN) is posing great challenges to traditional voltage control schemes. A two-stage voltage control strategy of ADN is proposed by the authors based on the alternating direction method of multipliers (ADMM) with refined power to hydrogen (P2H) model, considering multiple types of PV forms such as residential photovoltaic cluster (RPVC) and small-scale PV power stations. In the day-ahead stage, the optimal power flow is performed to determine the optimal scheduling results of on-load tap changers and capacitor banks etc. In the intra-day stage, the real-time voltage control strategy is implemented at the distribution network layer to regulate the power of each type of PV, energy storage systems and P2H to further reduce the voltage deviation. At the customer layer, the residential photovoltaic (RPV) within the RPVC is precisely controlled based on the ADMM algorithm to achieve the minimum voltage deviation at each RPV access point. The proposed strategy is tested on the modified IEEE 33-bus and IEEE 69-bus distribution systems, and the simulation results verify its effectiveness in mitigating voltage violations.

关键词： active distribution networks alternating direction method of multipliers coordinated voltage control power to hydrogen residential photovoltaic cluster

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Auction-based Energy Sharing Model for Large-scale PV Prosumer Clusters in Uncertain Environments

Auction-based Energy Sharing Model for Large-scale PV Prosum...

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

作者： He, Shuai Yang, Ming Yang, Donghua Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

ISBN: (纸本)9798350381849;9798350381832

The development of distributed photovoltaics (PV) has led to a sharp increase in the number of PV prosumers, forming a large-scale PV prosumer cluster. Energy sharing is an effective method to enhance the economics of PV prosumer clusters and promote the local consumption of distributed PV. Large-scale PV prosumer clusters will increase the computational cost of energy sharing. Meanwhile, the uncertainty of PV is also stronger and needs to be considered. So, an auction-based energy sharing model for large-scale PV prosumer clusters in uncertain environments is proposed. First, an energy sharing market framework based on a call auction mechanism is established. The clearing goal of the energy sharing service provider is to maximize social welfare. Secondly, proposes an energy sharing decision model for different types of prosumers with conditional value at risk (CVaR) and expected values as the objectives. Thirdly, consider the decision-making preferences of different types of prosumers and analyze the impact of the proportion of different types of prosumers on energy sharing. Finally, a distribution system containing 20 prosumers is used to verify the effectiveness and feasibility of the proposed method.

关键词： auction theory conditional value at risk energy sharing PV prosumer uncertainty

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Parameter Optimization for Temporary Primary Frequency control of Wind Turbines Based on Analytical Derivation 4

Parameter Optimization for Temporary Primary Frequency Contr...

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2023 4th International Conference on Mechanical Instrumentation and Automation, ICMIA 2023

作者： Wei, Xinyu Jin, Zhaoyang Li, Gengkun Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University China

DFIG has the capability to participate in power system frequency modulation through inertial control by returning the energy stored in the rotating mass of the generator that is delivered to the grid. When frequency modulation occurs, the primary frequency drop can lead to a reduction in the rotor kinetic energy stored in the DFIG, which is subsequently used to produce extra active power to sustain the system frequency. However, once the available rotor kinetic energy is released, the output power of the DFIG abruptly drops to restore the rotor speed. To reduce the extent of the secondary frequency deviation caused by the inertial control of DFIGs, this paper applies an analytically derived approach to optimize the parameters of temporary primary frequency control during rotor speed recovery. Specifically, the parameters optimized include termination time and active power Simulation results conducted using DIGSILENT simulation software have demonstrated that the optimized temporary primary frequency control strategy is capable of effectively reducing the secondary frequency drop that may occur when the DFIG is removed from frequency control. Moreover, setting the optimal termination time and controlling the active power output while the rotor speed is being restored are crucial to prevent excessive mechanical wear and fatigue that may be induced by a too-rapid recovery of rotor speed. © Published under licence by IOP Publishing Ltd.

关键词： Kinetic energy

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Cluster partition method of high-penetration distributed photovoltaics for autonomous operation and control of distribution network 5

Cluster partition method of high-penetration distributed pho...

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2023 5th International Conference on Information Science, Electrical, and Automation Engineering, ISEAE 2023

作者： Huang, Manlin Ye, Hua Ye, Peile Mou, Qianying Zhang, Wen Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781510667440

With the widespread integration of distributed photovoltaics (PV), it is urgent to realize the autonomous operation and control of distribution networks with high-penetration PVs. Due to the complex structure of the power system, the cluster management model has emerged. The perquisite lies in intentionally partitioning the network into several clusters. For this purpose, this paper proposes a cluster partition method of distribution networks with high-penetration of PVs. First, a comprehensive performance index for partitioning is proposed. The comprehensive performance index fully considers the degree of intra-cluster node connectivity, power balance and communication cost of clusters. Further, an improved genetic algorithm is applied in this paper to search for the optimal partition scheme. Finally, the effectiveness and rationality of the proposed method have been demonstrated in the IEEE 33-bus distribution network. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Electric power distribution

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