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Coordinated Robust PID-based Damping Control of Permanent Magnet Synchronous Generators for Low-frequency Oscillations Considering power System Operational Uncertainties

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Journal of Modern power Systems and Clean Energy 2024年第4期12卷 1042-1051页

作者： Rehan Sadiq Zhen Wang Chi Yung Chung Deqiang Gan Cunzhi Tong College of electrical Engineering Zhejiang UniversityHangzhou 310058China The Hong Kong Polytechnic University Hong KongChina state grid zhejiang electric power Company Hangzhou 310007China

In recent years, with the growth of wind energy resources,the capability of wind farms to damp low-frequency oscillations(LFOs) has provided a notable advantage for the stabilityenhancement of the modern power grid. Meanwhile, owingto variations in the power system operating point (OP), thedamping characteristics of LFOs may be affected adversely. Inthis respect, this paper presents a coordinated robust proportional-integral-derivative (PID) based damping control approachfor permanent magnet synchronous generators (PMSGs)to effectively stabilize LFOs, while considering power system operationaluncertainties in the form of a polytopic model constructedby linearizing the power system under a given set ofOPs. The proposed approach works by modulating the DC-linkvoltage control loop of the grid-side converter (GSC) via a supplementaryPID controller, which is synthesized by transformingthe design problem into H-infinity static output feedback(SOF) control methodology. The solution of H-infinity SOF controlproblem involves satisfying linear matrix inequality (LMI)constraints based on the parameter-dependent Lyapunov functionto ensure asymptotic stability such that the minimal H-infinityperformance objective is simultaneously accomplished forthe entire polytope. The coordinated damping controllers forthe multiple wind farms are then designed sequentially by usingthe proposed approach. Eigenvalue analysis confirms the improveddamping characteristics of the closed-loop system forseveral representative OPs. Afterward, the simulation results, includingthe performance comparison with existing approaches,validate the higher robustness of the proposed approach for awide range of operating scenarios.

关键词： Permanent magnet synchronous generator(PMSG) low-frequency oscillation(LFO) proportional-integralderivative(PID) robust control H-infinity static output feed-back control linear matrix inequality(LMI)

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Study on multi-timescale operation of hydrogen-containing energy coupled with transportation system

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Clean Energy 2024年第3期8卷 79-94页

作者： Xingang Wang Zhiyong Yu Jiayu Bian Jin Yu state grid Xinjiang electric power CO LTD.Urumqi830000China state grid Xinjiang electric power Economic and Technology Research Institute Urumqi830000China

With the widespread attention on hydrogen energy,the operation optimization of the coupling system of hydrogen energy and transportation has become a critical ***,this study develops a hydrogen-containing energy transportation coupling system for the system collaborative operation framework,operation mode and equipment modelling of the ***,a medium-to long-term operation optimization model and a short-term operation optimization model were constructed considering the differences in the operation of coupled systems at different timescales and operating costs as the objective function and power balance and system equipment as *** the medium-and long-term operation optimization model,the planning scenario reduction method is used to reduce the wind power generation *** the short-term operation optimization model,a multivariate uncertainty model is constructed to represent the uncertainty in the coupling ***,the solution method of the model is ***,a coupled system is simulated to verify the effectiveness of the model.(i)When the initial scene set is 600,the typical scene reduction method using Latin hypercube sampling and the Wasserstein distance can reduce operating costs by 7.60%and 9.49%compared with K-means reduction and K-media reduction methods.(ii)The sensitivity coefficients of hydrogen sales price,electricity sales price and maintenance rate to operating costs are-0.031%,-1.009%and 0.0105%,respectively.(iii)Considering multiple uncertainties can help make optimal decisions based on the overall consideration of disadvantage scenarios,thereby reducing system operating costs.

关键词： hydrogen-containing energy system transportation system multi-timescale operation optimization

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Model moisture transport in oil-paper insulation of transformer:Theory and experiment

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High Voltage 2024年第4期9卷 879-887页

作者： Junjie Zhou Zhicheng Wu Yiran Guo Rui Zhang Wenbing Zhu Qiaogen Zhang state Key Laboratory of electric Insulation and power Equipment Xi'an Jiaotong UniversityXi'anChina state grid Shandong electric power Research Institute JinanChina

The insulation performance of oil paper insulation is significantly affected by moisture such that monitoring moisture content is ***,it is difficult to obtain the moisture content accurately due to its dynamic change under multi physical *** the moisture transportation in oil paper insulation under multi physical fields becomes a vital method in solving the problem.A multi physical model describing moisture migration was proposed,which considered the effects of temperature on moisture in different existing states in oil-immersed paper(OIP).The temperature distribution formed a vapour pressure gradient to drive moisture migration and affected migration ***,experiments and simulations of moisture migration were performed,which showed that the experiments were in good agreement with *** results revealed that the temperature gradient caused uneven moisture distribution and the increased temperature reduced OIP moisture *** established model could fully characterise moisture migration under temperature gradient,which provided a theoretical reference for predicting the risk of partial dampness and evaluating insulation performance.

关键词： moisture insulation distribution

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Fuzzy Droop Control for SOC Balance and Stability Analysis of DC Microgrid with Distributed Energy Storage Systems

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Journal of Modern power Systems and Clean Energy 2024年第4期12卷 1203-1216页

作者： Jipeng Gu Xiaodong Yang Youbing Zhang Luyao Xie Licheng Wang Wenwei Zhou Xiaohui Ge College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China College of electrical Engineering Hefei University of TechnologyHefei 230006China electric power Research Institute of state grid zhejiang electric power Co. Ltd.Hangzhou 310023China

The unbalanced state of charge(SOC)of distribut-ed energy storage systems(DESSs)in autonomous DC mi-crogrid causes energy storage units(ESUs)to terminate opera-tion due to overcharge or overdischarge,which severely affects the power *** this paper,a fuzzy droop control for SOC balance and stability analysis of DC microgrid with DESSs is proposed to achieve SOC balance in ESUs while maintaining a stable DC bus ***,the charge and discharge modes of ESUs are determined based on the power supply requirements of the DC ***-dimensional fuzzy logic is then ap-plied to establish the relationship between SOC and the droop coefficient R,in the aforementioned two *** addition,when integrated with voltage-current double closed-loop con-trol,SOC balance in different ESUs is *** improve the balance speed and precision,an exponential acceleration factor is added to the input variable of the fuzzy ***,based on the average model of converter,the system-level stabil-ity of microgrid is ***/Simulink simulation re-sults verify the effectiveness and rationality of the proposed method.

关键词： DC microgrid distributed energy storage system fuzzy droop control state of charge(SOC)balance stabilityanalysis

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Transient AC Overvoltage Suppression Orientated Reactive power Control of the Wind Turbine in the LCC-HVDC Sending grid

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CES Transactions on electrical Machines and Systems 2024年第2期8卷 152-161页

作者： Bo Pang Xiao Jin Quanwang Zhang Yi Tang Kai Liao Jianwei Yang Zhengyou He IEEE College of electrical Engineering Southwest Jiaotong UniversityChengdu 610031China state grid zhejiang electric power Company HangzhouChina

High-voltage direct current(HVDC) transmission is a crucial way to solve the reverse distribution of clean energy and loads. The line commutated converter-based HVDC(LCCHVDC) has become a vital structure for HVDC due to its high technological maturity and economic advantages. During the DC fault of LCC-HVDC, such as commutation failure, the reactive power regulation of the AC grid always lags the DC control process, causing overvoltage in the AC sending grid, which brings off-grid risk to the wind power generation based on power electronic devices. Nevertheless, considering that wind turbine generators have fast and flexible reactive power control capability, optimizing the reactive power control of wind turbines to participate in the transient overvoltage suppression of the sending grid not only improves the operational safety at the equipment level but also enhances the voltage stability of the system. This paper firstly analyses the impact of wind turbine's reactive power on AC transient overvoltage. Then, it proposes an improved voltage-reactive power control strategy, which contains a reactive power control delay compensation and a power command optimization based on the voltage time series prediction. The delay compensation is used to reduce the contribution of the untimely reactive power of wind turbines on transient overvoltage, and the power command optimization enables wind turbines to have the ability to regulate transient overvoltage, leading to the variation of AC voltage, thus suppressing the transient overvoltage. Finally, the effectiveness and feasibility of the proposed method are verified in a ±800kV/5000MW LCC-HVDC sending grid model based on MATLAB/Simulink.

关键词： Commutation failure LCC-HVDC Transient overvoltage Wind power

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Incremental cost analysis model of distribution network based on economic dispatch of distributed new-energy storage system

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Clean Energy 2024年第2期8卷 89-103页

作者： Zhuan Zhou Jiayu Bian Zhiyong Yu state grid Xinjiang electric power Co. ltdXinjiangChina

With the implementation of China’s carbon-peaking and carbon-neutrality strategy,new energy will achieve leapfrog *** to the good economics of distributed new-energy generation,it can not only save users’own investment,but also help to achieve local consumption of new ***,it will also bring about a series of incremental costs to the power *** paper first enumerates the concept,development status and scheduling mode of a distributed new-energy storage *** on the above,it establishes a new-energy power generation model and an energy storage system charging and discharging model,and proposes a global optimization scheduling model for a distributed new-energy storage system,considering the time-of-use electricity price and taking the lowest total operating cost of the distributed new-energy power generation system as the objective ***,it proposes a distribution network incremental cost analysis model based on the penetration of distributed new *** calculation results show that the incremental cost of grid-connected distributed new energy is 1.0849,1.2585 and 1.3473 yuan/kWh,respectively,which indicates that the global dispatching model can optimize the power consumption structure of a distributed power generation system,and has the function of peak shaving and valley filling,but the incremental cost of the distribution network will also increase.

关键词： distributed new energy electrochemical energy storage economic dispatch distribution network cost time-sharing price

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Hybrid Multi-Infeed Interaction Factor Calculation Method Considering Voltage Regulation Control Characteristics of Voltage Source Converter

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Energy Engineering 2024年第8期121卷 2257-2273页

作者： Shan Liu Chengbin Chi Fengze Han Yanan Wu Lin Zhu Tuo Wang state grid Smart grid Research Institute State Grid Corporation of ChinaBeijing102209China School of electric power Engineering Northeast Electric Power UniversityJilin132012China

Voltage source converter based high voltage direct current(VSC-HVDC)can participate in voltage regulation by flexible control to help maintain the voltage stability of the power *** order to quantitatively evaluate its influence on the voltage interaction between VSC-HVDC and line commutated converter based high voltage direct current(LCC-HVDC),this paper proposes a hybrid multi-infeed interaction factor(HMIIF)calculation method considering the voltage regulation control characteristics of ***,for a hybrid multi-infeed high voltage direct current system,an additional equivalent operating admittance matrix is constructed to characterize HVDC equipment characteristics under small ***,based on the characteristic curve between the reactive power and the voltage of a certain VSC-HVDC project,the additional equivalent operating admittance of VSC-HVDC is *** additional equivalent operating admittance matrix calculation method is ***,the equivalent bus impedance matrix is obtained by modifying the alternating current(AC)system admittance matrix with the additional equivalent operating admittance *** this basis,the HMIIF calculation method based on the equivalent bus impedance ratio is ***,the effectiveness of the proposed method is verified in a hybrid dual-infeed high voltage direct current system constructed in power Systems Computer Aided Design(PSCAD),and the influence of voltage regulation control on HMIIF is analyzed.

关键词： Hybrid multi-infeed high voltage direct current system hybrid multi-infeed interaction factor control modes equivalent node impedance ratio voltage interaction characteristics

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A Mode-switching Strategy of Droop Control for VSC-MTDC Systems Considering Maximum DC Voltage Regulation Capability

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CSEE Journal of power and Energy Systems 2024年第3期10卷 903-912页

作者： Yizhen Wang Fengliang Qiu Zhongguan Wang Yirun Ji Zhengguang Chen Chengshan Wang Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China electric power Research Institute of state grid JiBei electric power Co.Ltd. Beijing 100045China state grid Corporation of China Beijing 100031China IEEE

To achieve the goal of carbon neutrality,renewable energy integration through a voltage source converter based multi-terminal direct current(VSC-MTDC)system has been identified as a promising *** tackle the significant DC voltage over-limit problem in a VSC-MTDC system during disturbances,this paper proposes a mode-switching strategy of droop control considering maximum DC voltage regulation *** close relationship between node injection powers and node DC voltages in the MTDC system is elaborated,and the most effective regulation approach of local injection power for limiting DC voltage deviation is *** operating point trajectories of different droop control explains that the DC voltage deviation can be minimized by fully utilizing the capacity of ***,the mode-switching strategy with the maximum DC voltage regulation capability is realized by the switching between the voltage droop control and the constant maximum power *** addition,a mode recovery process and a smooth switching method are developed to make converters regain the capability of maintaining DC voltage and reduce power fluctuation during mode switching,***,three cases are investigated to verify the effectiveness of the proposed mode-switching *** with simulation results of the conventional droop control and the DC voltage deviation-dependent droop control,better performance of transient and steady-state DC voltage deviation is achieved through the proposed strategy.

关键词： Droop control maximum DC voltage regulation capability mode-switching VSC-MTDC

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A Simple and Effective Surface Defect Detection Method of power Line Insulators for Difficult Small Objects

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Computers, Materials & Continua 2024年第4期79卷 373-390页

作者： Xiao Lu Chengling Jiang Zhoujun Ma Haitao Li Yuexin Liu state grid Jiangsu electric power Co. Ltd.Nanjing210024China state grid Changzhou power Supply Company Changzhou213003China

Insulator defect detection plays a vital role in maintaining the secure operation of power *** address the issues of the difficulty of detecting small objects and missing objects due to the small scale,variable scale,and fuzzy edge morphology of insulator defects,we construct an insulator dataset with 1600 samples containing flashovers and *** a simple and effective surface defect detection method of power line insulators for difficult small objects is ***,a high-resolution featuremap is introduced and a small object prediction layer is added so that the model can detect tiny ***,a simplified adaptive spatial feature fusion(SASFF)module is introduced to perform cross-scale spatial fusion to improve adaptability to variable multi-scale ***,we propose an enhanced deformable attention mechanism(EDAM)*** integrating a gating activation function,the model is further inspired to learn a small number of critical sampling points near reference *** the module can improve the perception of object *** experimental results indicate that concerning the dataset of flashover and breakage defects,this method improves the performance of YOLOv5,YOLOv7,and *** practical application,it can simply and effectively improve the precision of power line insulator defect detection and reduce missing detection for difficult small objects.

关键词： Insulator defect detection small object power line deformable attention mechanism

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Energy Economic Dispatch for Photovoltaic-Storage via Distributed Event-Triggered Surplus Algorithm

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Energy Engineering 2024年第9期121卷 2621-2637页

作者： Kaicheng Liu Chen Liang Naiyue Wu Xiaoyang Dong Hui Yu China electric power Research Institute Beijing100192China electric power Research Institute of state grid Gansu electric power Company Lanzhou730000China state Key Laboratory of power grid Safety Beijing100084China

This paper presents a novel approach to economic dispatch in smart grids equipped with diverse energy *** method integrates features including photovoltaic(PV)systems,energy storage coupling,varied energy roles,and energy supply and demand *** systemmodel is developed by considering energy devices as versatile units capable of fulfilling various functionalities and playing multiple roles *** strike a balance between optimality and feasibility,renewable energy resources are modeled with considerations for forecasting errors,Gaussian distribution,and penalty ***,this study introduces a distributed event-triggered surplus algorithm designed to address the economic dispatch problem by minimizing production *** in surplus theory and finite time projection,the algorithm effectively rectifies network imbalances caused by directed graphs and addresses local inequality *** algorithm greatly reduces the communication burden through event triggering ***,both theoretical proofs and numerical simulations verify the convergence and event-triggered nature of the algorithm.

关键词： Fully distributed algorithm economic dispatch directed graph renewable energy resource

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