30 April 2025, Volume 45 Issue 2
    

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  • Research on GaN-based High-frequency LLC Communication Power Supply
    GAO Shanshan, ZHANG Xuan, LIU Boyu, WANG Yijie, XU Dianguo
    Journal of Northeast Electric Power University. 2025, 45(2): 1-7. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0001-07
    Abstract ( ) Knowledge map Save
    Miniaturized modular power supplies hold considerable significance in domains such as telecommunications,automotive engineering,aerospace technology,and data processing systems.By elevating the operating frequency of circuits,the size of passive components can be diminished,thereby enhancing the system's overall power density.This paper explores a half-bridge LLC resonant converter configuration,delving into its fundamental working principles and distinctive characteristics while aligning system parameters with specific project requirements.Recognizing the effect of leakage inductance on the transformer's secondary side under high-frequency conditions,an optimized circuit model is proposed.To ensure soft-switching attributes,the parameter calculation methodology has been meticulously refined.A prototype leveraging Gallium Nitride （GaN）technology was developed for empirical validation.It delivers a rated output power of 300 W,operates at a switching frequency of 1 MHz,sustains a nominal input voltage of 48 V,and outputs a voltage of 12 V.The system achieves an efficiency of 95.6%at full load, substantiating the accuracy and reliability of the theoretical analysis presented herein.
  • Key Issues and Challenges of Wide-gain Bidirectional Quasi-single-stage Isolated DC-DC Converters 
    LIU Fei, LI Jinyu, ZHAO Yang
    Journal of Northeast Electric Power University. 2025, 45(2): 8-13. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0008-06
    Abstract ( ) Knowledge map Save
    With the rapid development of new energy vehicles,V2X Vehicle to Everything）technology has become an effective means for vehicle-grid-load interconnection and energy sharing.As the core component of V2X technology,the bidirectional DC-DC converter is a key device for energy interaction.Faced with the significant voltage fluctuations of power batteries,how to maximize weighted efficiency over a wide voltage range,reduce the number of components,and enhance power density has always been the goal pursued in the development of V2X bidirectional converters.This paper focuses on wide-range gain bidirectional quasi-single-stage isolated DC-DC converters,which summarizes and reviews the existing research from three aspects:converter topology,modulation strategy,and control.The paper also identifies the shortcomings and challenges of the current research.
  • Modeling Methodology Research for Dual-active-bridge Parallel Systems With Integral Droop Control Based on Unified Dynamic Model
    PAN Xiuyi, WANG Sijia, SUN Zhan, Liu Aocheng, GAO Shanshan, Wang Yijie
    Journal of Northeast Electric Power University. 2025, 45(2): 14-21. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0014-08
    Abstract ( ) Knowledge map Save
    The modular design and parallel optimization control of the DC microgrid distributed power supply system significantly enhance system stability and power expansion capabilities.However,due to the dynamic parameter cross-coupling characteristics of the bidirectional isolated converter parallel system,new challenges are brought to system modeling and stability analysis.Therefore,based on the unified dynamic model of the Dual Active Bridge （DAB）converter,a parallel integral droop control modeling method for multi-energy converters is proposed.The simulation results show that the proposed modeling method can accurately predict the step disturbance response,verifying the accuracy of the model.
  • An Review of Harmonic Suppression Methods for Multilevel Power Amplifiers in High Precision Applications 
    WEI Jian, LIU Chen, GUO Zhichao, ZHAO Xiaokun, WANG Weinan, ZHANG Jiawei
    Journal of Northeast Electric Power University. 2025, 45(2): 22-31. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0022-10
    Abstract ( ) Knowledge map Save
    In recent years,with the application of multilevel power amplifier in high precision field,the total harmonic distortion （THD）has become an important index in high-precision fields.Firstly,this paper introduces the application of multilevel power amplifier in the field of high precision and the harmonic problems caused by it.At the same time, the root of total harmonic distortion caused in a multilevel power amplifier system is elucidated.Then,the main literature is classified according to the means used to suppress total harmonic distortion,and the advantages and disadvantages of different harmonic suppression methods in topology,modulation strategy and multimodal control are summarized.In addition,the principle and characteristics of the new theory and method of harmonic suppression are emphatically expounded.Finally,a summary of THD suppression methods for multilevel power amplifiers was provided, highlighting research ideas for increasing the number of voltage levels and response speed,etc.
  • Review of Research on Temperature Control load Participating in Power Grid Frequency Modulation
    ZHANG Liwei, DONG Hao, ZHOU Wenting
    Journal of Northeast Electric Power University. 2025, 45(2): 32-43. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0032-12
    Abstract ( ) Knowledge map Save
    In the face of large-scale development and utilization of new energy such as wind power and photovoltaic, the problem of insufficient flexibility of power system operation has become increasingly prominent.With the continuous advancement of electric energy transformation,the continuous innovation of power technology and the wide application of distributed generation technology,the load side is developing rapidly towards the trend of digitization,intelligence and activeness.Among them,temperature control loads such as air conditioning and electric heating show great adjustable potential.It is necessary to sort out the current research progress and future direction of temperature control load participating in grid auxiliary service technology from different angles.Firstly,the challenges faced by the active frequency control of the power grid under the new power system are summarized.Combined with the control framework of different frequency modulation mechanisms,the principles and characteristics of each control method of the temperature control load participating in the frequency modulation of the power grid are described in detail,and the advantages and disadvantages of different methods are analyzed.Secondly,the performance and application scenarios of single temperature control load and aggregation model are evaluated.Finally,the main problems and technical methods of air-conditioning load participating in different auxiliary services such as primary frequency modulation,secondary frequency modulation and underfrequency load shedding are summarized,so as to promote the temperature-controlled load to become an important part of power system frequency modulation in the future.
  • Constructing Method of Asset Label in Power Monitoring System Network Space Based on Asset Portrait
    JIANG Yuan, HE Xin, LI Weigi
    Journal of Northeast Electric Power University. 2025, 45(2): 44-51. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0044-08
    Abstract ( ) Knowledge map Save
    With the wide application of power monitoring system,the management of cyberspace assets is becoming more and more complex,facing the problems of various data and unknown classification.To solve the above problems, the research on the construction and prediction recognition method of the cyberspace asset portrait of the power monitoring system was proposed.It proposes a prediction recognition method combined with MLP_LSTM model,which constructs a preliminary portrait of assets through asset information collection and feature extraction.Then,MLP is used to perform the nonlinear mapping of features,and LSTM model is introduced to capture the time series information of assets to achieve more accurate prediction and recognition.The simulation experiments show that,compared with the traditional method,the proposed method not only significantly improves the management efficiency and security,but also further improves the accuracy of prediction and identification through the introduction of MLP_LSTM model,which provides strong technical support for the intelligent management of cyberspace assets of the power monitoring system.
  • Research and Application of 3D Scanning Wind Liidar for Wind Resource Observation
    LI Jinxin, ZHENG Yue, BAO Wenqi, XIAO Yongming, LIU Qichao
    Journal of Northeast Electric Power University. 2025, 45(2): 52-58. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0052-07
    Abstract ( ) Knowledge map Save
    Based on the principle of coherent Doppler velocimetry,a wind-measuring lidar system with 3D scanning function is developed.By constructing the three-wave beam scanning mode and the speed azimuth display algorithm, the dynamic reconstruction of 3D wind field in the atmospheric boundary layer is realized.The synchronous observation test of ground-based radar and 3D laser radar was carried out in Lankao Plain area of Henan Province,and the linear regression model and timing analysis method were used to compare the horizontal wind speed,wind direction and 140m radial wind speed at the 280m height layer.The experimental results show that the horizontal wind speed measurement shows significant linear correlation；the wind direction data maintain high consistency （R2=0.908），but there is local directional deviation；the characteristics of radial wind speed has good synchronization （R2=0.982）。The 3D radar system shows the technical advantages of second-level refresh rate and sub-meter-level spatial resolution,which can accurately capture the low-altitude jet current and wind shear phenomenon.This study verifies the measurement reliability of 3D laser wind measurement technology in flat terrain,and provides a high-precision detection method for micro-site location and wake effect assessment of wind farms.
  • Research on Multi-stage Resilience Enhancement Methodology for Power Systems Under Extreme Ice-snow Weather Events
    WANG Weichen, LIN Haiyuan
    Journal of Northeast Electric Power University. 2025, 45(2): 59-68. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0059-10
    Abstract ( ) Knowledge map Save
    In recent years,with the rapid expansion of ultra-high voltage （UHV）long-distance overhead transmission networks and the continuous extension of power infrastructure coverage,the frequency of ice disasters has surged significantly.Chain fault events such as conductor breakage and tower collapse have occurred frequently,posing severe challenges to the secure and stable operation of power systems.To mitigate these impacts,it is crucial to enhance power system resilience during ice disasters.This involves calculating ice thickness on transmission lines using weather forecasts and micro-terrain data,determining the total load on lines and towers,and assessing the change in line failure rates based on design strengths.System operating states are simulated to construct resilience indices and evaluate system resilience.Enhancement methods are applied in pre-disaster,during-disaster,and post-disaster stages to improve system resilience.
  • Subsynchronous Oscillation Characteristics Analysis of PMSG-based Wind Farms through LCC-HVDC Transmission System
    YAN Gangui, REN Shuang, WANG Zhenyang, ZHAO Yue, GUO Jianyu, WANG Dazhong
    Journal of Northeast Electric Power University. 2025, 45(2): 69-81. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0069-13
    Abstract ( ) Knowledge map Save
    The "dual carbon"goal propels the quick growth of new energy,and the large-scale wind power is connected to the grid via the traditional high-voltage direct current transmission （LCC-HVDC），which is the main way of wind power development and utilization.Subsynchronous oscillation is mostly caused by an inappropriate interaction between direct drive wind farms and LCC-HVDC,however there are many different causes that might cause it.In this article,the sub-synchronous oscillation problem of direct-drive wind farm via LCC-HVDC transmission system is addressed,and the impedance model of direct-drive wind turbine,DC transmission system and Point of Common Coupling （PCC）port is constructed by perturbation determination method.Based on the impedance analysis method,a stability criterion applicable to the AC/DC system is proposed to analyze the dominant factors affecting the stability domain of the system and the influence of each device on the impedance characteristics of the system,and the influence law of the control parameters on the impedance characteristics of the system is revealed.The results show that a decrease in the proportional coefficient and an increase in the integral coefficient of the rectifier side controllers of the direct drive wind farm GSC and LCC-HVDC will lead to negative resistance characteristics in the impedance of LCC-HVDC and wind turbine ports,resulting in negative damping characteristics in the parallel impedance composed of the direct drive wind farm and LCC-HVDC,indicating the risk of sub synchronous oscillation in the system.Finally, the time domain simulation of PSCAD/EMTDC platform is carried out to further verify the influence of control parameters on system stability.
  • Static Voltage and Pressure Safety Analysis of Electricity-gas-thermal Coupling Integrated Energy System Based on Multi-energy Flow Calculation 
    CHU Zhuang, SUN Shaowen, ZHOU Chi
    Journal of Northeast Electric Power University. 2025, 45(2): 82-92. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0082-11
    Abstract ( ) Knowledge map Save
    In the integrated energy system,the electrical and thermal systems are connected through coupling elements The violation of the node variables of any subsystem may lead to unstable and unsafe operation of the entire integrated energy system.To this end,the static voltage and air pressure safety and stability margin indicators of the integrated energy system and strategies to improve the security of the integrated energy system are proposed.First,a model of the electrical and thermal system in the integrated energy system is constructed,and the coupling hub adopts the energy hub model；secondly,the alternating solution method of Newton-Raphson method is used to solve the multi-energy flow equation of the integrated energy system；next,the static voltage and pressure safety are given Margin range and related safety strategies:Based on the given safety margin index,use the sensitivity method to analyze the safety margin of state variables such as node voltage and air pressure under load disturbance to determine the weak links of the system；finally,select an appropriate strategy to Ensure that the system's node voltage and node air pressure meet safety margin requirements after load fluctuations.The calculation example analysis shows that the method proposed in this paper to determine system weak links is more efficient,and the proposed strategy can help improve the system security of the integrated energy system and enable it to operate reliably.
  • Research on optimal Operation of Multi-integrated Energy System Considering Multiple Uncertainties and P2P Transaction Mode 
    YU Na, YUAN Zhihao, HUANG Dawei, CHANG Yingjie
    Journal of Northeast Electric Power University. 2025, 45(2): 93-103. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0093-11
    Abstract ( ) Knowledge map Save
    With the high development of energysystem interconnection and energy transaction marketization,the regional interconnection of Multi-Integrated Energy System（MIES）makes the energy utilization efficiency of Integrated Energy System （IES）more efficient and the economic benefits more considerable.Firstly,this paper constructs the energy sharing architecture of MIES cooperation alliance under the background of multi-energy market, and establishes the power and backup point to point （P2P）transaction model between MIES.Secondly,the uncertainty of new energy output,the risk of electricity price and reserve price fluctuation are analyzed.In this paper,the conditional value-at-risk （CVaR）theory is used to construct the risk cost function and incorporate it into the comprehensive operation cost model.Finally,the Alternating Direction Method of Multipliers （ADMM）is selected for distributed solution,and the correctness and rationality of the model are verified by an example analysis.The minimization of MIES operating cost and the maximization of payment income are realized,which reflects the influence of different conditional risk aversion coefficients on MIES.
  • Fault Scenario Screening of Electric-gas Integrated Energy System Based on Proximal Strategy Optimization Algorithm
    ZHAO Pengyang, CHEN Hao, SUN Haihang
    Journal of Northeast Electric Power University. 2025, 45(2): 104-112. https://doi.org/10.19718/j.issn.1005-2992.2025-02-0104-09
    Abstract ( ) Knowledge map Save
    Extreme disasters may cause large-scale energy supply problems in the electricity-gas integrated energy system,resulting in power outages and gas outages.Existing fault scenario screening methods mostly focus on single fault scenarios and lack modeling of the cascading fault propagation mechanism in the electricity-gas coupled system,resulting in insufficient robustness prediction of the evaluation results for extreme disasters.This paper constructs a cascading failure model for the electricity-gas integrated energy system,considers the fault propagation mechanism of power transmission lines and natural gas pipelines,constructs a dynamic propagation model of cascading failures based on Markov decision process,and uses the proximal policy optimization algorithm to efficiently search and optimize disaster scenarios.Finally,a cascading failure model for the electricity-gas integrated energy system is built based on the IEEE 30-node power grid and 20-node gas grid,and the PPO algorithm training process is tested.The example shows that this method can identify serious fault scenarios and fault propagation paths and ensure good convergence,thereby improving the emergency response capability of the electricity-gas integrated energy system when it is impacted.
  • Research on Operation Strategy of Units in Pumped-storage Power Station Based on Unit Optimization
    LI Cuiping, YU Shuyang, LIU Liande, HE Jiang, LI Junhui, LI Kaigiang
    Journal of Northeast Electric Power University. 2025, 45(2): 113-120. https://doi.org/10.19718/i.issn.1005-2992.2025-02-0113-08
    Abstract ( ) Knowledge map Save
    At present,in the formulation of the in-plant operation strategy of pumped-storage power plants,there are problems such as not distinguishing the power characteristics of the same type of units,reducing the number of start-stops of the units,and the units working in the near-vibration range.In order to solve the above problems,this paper proposes an operation strategy of units in a pumped-storage power station based on unit combination optimization.On the basis of distinguishing the operating characteristics of units of the same type,optimization is carried out with the goal of minimum water consumption.List the unit combinations in the dispatching period,carry out the priority sorting with the goal of the least water consumption,and filter by the unit start and stop constraints.Based on this,the unit combination scheme in each dispatching period is obtained,and the power allocation of each unit is determined according to the screening results.The simulation results show that the strategy in this paper is effective in reducing water loss and improving the overall efficiency of pumped-storage power stations.
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