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Relationship Between Circuit Parameter and Performance of Cuk Converter in wind power system

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Relationship Between Circuit Parameter and Performance of Cu...

第37届中国控制会议

作者： Yingjun Guo Honghong Kong Zheyuan Zhang Hexu Sun Qi Xu Hebei University of Science and Technology

wind energy, which is clean and abundant, is attached great importance to and becomes the fastest developing renewable energy. However, the randomness of wind energy brings a series of technical problems for new energy power generation. It is of great significance to study how to rationally apply power electronic devices to ensure the steady-state conversion of electrical energy in wind power system. Considering the engineering application of Cuk converter to solve the stabilized voltage problem in the wind power system, this paper mainly studies the relationship between circuit parameter and performance of Cuk converter. The switching current and the output voltage ripple are taken as a measure of system performance main indicators. The operating principle of the Cuk converter is analyzed and the mathematical model of the parameters, the switching current and the output voltage ripple are set up. The results show that the system can meet the expectation index and output stability by controlling the circuit parameters. It provides a theoretical basis for the component selection of Cuk converter that meets the performance requirements of wind power system. Thus, it provides a feasible method for renewable energy utilization efficiently. The detailed simulation results and experimental results verified the correctness of the theoretical analysis.

关键词： wind power system Cuk Converter Circuit Parameter Performance

Real-time Subsynchronous Control Interaction Monitoring Using Improved Intrinsic Time-scale Decomposition

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Journal of Modern power systems and Clean Energy 2023年第3期11卷 816-826页

作者： Yang Wang Hanlu Yang Xiaorong Xie Xiaomei Yang Guanrun Chen College of Electrical Engineering Sichuan UniversityChengduChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

In recent years,subsynchronous control interaction(SSCI)has frequently taken place in renewable-connected power systems.To counter this issue,utilities have been seeking tools for fast and accurate identification of SSCI events.The main challenges of SSCI monitoring are the time-varying nature and uncertain modes of SSCI events.Accordingly,this paper presents a simple but effective method that takes advantage of intrinsic time-scale decomposition(ITD).The main purpose is to improve the accuracy and robustness of ITD by incorporating the least-squares method.Results show that the proposed method strikes a good balance between dynamic performance and estimation accuracy.More importantly,the method does not require any prior information,and its performance is therefore not affected by the frequency constitution of the SSCI.Comprehensive comparative studies are conducted to demonstrate the usefulness of the method through synthetic signals,electromagnetic temporary program(EMTP)simulations,and field-recorded SSCI data.Finally,real-time simulation tests are conducted to show the feasibility of the method for real-time monitoring.

关键词： Subsynchronous control interaction(SSCI) intrinsic time-scale decomposition(ITD) wind power system realtime monitoring

Simplified Modelling of Oscillation Mode for wind power systems

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Journal of Modern power systems and Clean Energy 2021年第1期9卷 56-67页

作者： Chi Hsiang Lin the Department of Electrical Engineering National Taitung CollegeTaitung CityTaiwanChina

wind turbine generators can be operated in various types of system configurations. Once the configurations change, the system oscillation mode shapes change accordingly.The modelling of the full system is necessary for studying this issue, yet it is quite hard. In this paper, a simple approach is developed to study the mode shapes of wind power systems without the necessity of adopting the complex full-system models.The key is that the q-d axis model of electric power system is transformed into the single-axis model, so that it could integrate with the equivalent circuit model of drive train mechanism. After analyzing some of the system configurations organized by the well-known MOD-2 wind turbine generator unit,the proposed approach is found to be effective for analyzing various oscillation modes such as the local torsional oscillations,as well as the inter-unit and inter-area oscillations.

关键词： wind turbine generator(WTG) wind power system oscillation mode dynamics

Mathematical Morphology-Based Artificial Technique for Renewable power Application

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Computers, Materials & Continua 2021年第11期69卷 1851-1875页

作者： Buddhadeva Sahoo Sangram Keshari Routray Pravat Kumar Rout Mohammed M.Alhaider Department of Electrical Engineering Siksha‘O’Anusandhan UniversityOdisha751030India Department of Electrical Electronics Engineering Siksha‘O’Anusandhan UniversityOdisha751030India College of Engineering at Wadi Addawaser Prince Sattam bin Abdulaziz University11991Saudi Arabia

This paper suggests a combined novel control strategy for DFIG based wind power systems(WPS)under both nonlinear and unbalanced load conditions.The combined control approach is designed by coordinating the machine side converter(MSC)and the load side converter(LSC)control approaches.The proposed MSC control approach is designed by using a model predictive control(MPC)approach to generate appropriate real and reactive power.The MSC controller selects an appropriate rotor voltage vector by using a minimized optimization cost function for the converter operation.It shows its superiority by eliminating the requirement of transformation,switching table,and the PWM techniques.The proposed MSC reduces the cost,complexity,and computational burden of the WPS.On the other hand,the LSC control approach is designed by using a mathematical morphological technique(MMT)for appropriate DC component extraction.Due to the appropriate DC-component extraction,the WPS can compensate the harmonics during both steady and dynamic states.Further,the LSC controller also provides active power filter operation even under the shutdown of WPS condition.To verify the applicability of coordinated control operation,the WPS-based microgrid system is tested under various test conditions.The proposed WPS is designed by using a MATLAB/Simulink software.

关键词： Model predictive control mathematical morphological technique power quality power reliability wind power system sensitive load

Improvement to observability measures of LFO modes in power systems with DFIGs

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Frontiers in Energy 2021年第2期15卷 539-549页

作者： Shenghu LI School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

Observation of the low-frequency oscillation (LFO) modes in power systems is important to design the damping scheme. The state equations of the power system with the doubly-fed induction generators (DFIGs) are derived to find the LFO modes related to the synchronous generator (SGs) and the DFIGs. The definition of the observability measure is improved to consider the initial output and the attenuation speed of the modes. The sensitivities of the observability measures to the control parameters are derived. The numerical results from the small and large-disturbance validate the LFO modes caused by the DFIGs, and different observability measures are compared. Adjustment of the control parameters is chosen based on the sensitivity model to improve the observability and damping ratio of the LFO mode, and the stability of the wind power system.

关键词： wind power system low-frequency oscillation(LFO) observability measure sensitivity doubly-fed induction generator(DFIG)

Sliding Mode Control of Pitch Angle for direct driven PM wind Turbine

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Sliding Mode Control of Pitch Angle for direct driven PM Win...

第26届中国控制与决策会议

作者： Wang Xin Zhu Wanli Qin Bin Li Pengcheng School of Electric ＆ Information Engineering Hunan University of Technology

ISBN: (纸本)9781479937066

The power generated by wind turbines appears to be instable at high rate speed due to the stochastic nature of wind speed, system lagging and nonlinearities, and involving time-variable parameters. To improve the dynamic performance in the operation region of constant power output, a sliding mode variable structure controller based on the analysis of the features model of the variable pitch and the speed wind turbine generator system is proposed. Moreover, to eliminate the chattering problem caused by the sign function in the traditional controllers, a quasi-sliding mode controller within the boundary layer is introduced. The pitch control model of a 2MW permanent magnet direct-drive wind power system is built and simulated. The simulation results show that the sliding mode control with quasi sliding mode can cope with traditional chattering problems in variable structure systems, and has such advantages as strong robustness to changes in parameters and fast response.

关键词： wind power system pitch-angle chattering free sliding mode control

IEC 61400-25 Protocol based Monitoring and Control Protocol for Tidal Current power Plant

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IEC 61400-25 Protocol based Monitoring and Control Protocol ...

2010 International Conference on Life system Modeling and Simulation & 2010 International Conference on Intelligent Computing for Sustainable Energy and Environment

作者： Jung Woo Kim Hong Hee Lee School of Electrical Engineering University of Ulsan

wind energy and tidal current power have a common operation principle. Tidal current power converts kinetic energy of fluid to electric power. The communication infrastructure is very important to con

ISBN: (纸本)9783642156205;3642156207

关键词： IEC 61400-25 Tidal current power Monitoring Remote control Current power control protocol Communications infrastructure power Plants Tidal power plants wind power system International Electrotechnical Commission Remote Control Center monitoring systems Working Conditions kinetic energy