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Online Learning Control for Harmonics Reduction Based on Current Controlled Voltage Source Power Inverters 被引量:2
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作者 Naresh Malla Ujjwol Tamrakar +2 位作者 Dipesh Shrestha Zhen Ni Reinaldo Tonkoski 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2017年第3期447-457,共11页
Nonlinear loads in the power distribution system cause non-sinusoidal currents and voltages with harmonic components.Shunt active filters(SAF) with current controlled voltage source inverters(CCVSI) are usually used t... Nonlinear loads in the power distribution system cause non-sinusoidal currents and voltages with harmonic components.Shunt active filters(SAF) with current controlled voltage source inverters(CCVSI) are usually used to obtain balanced and sinusoidal source currents by injecting compensation currents.However,CCVSI with traditional controllers have a limited transient and steady state performance.In this paper,we propose an adaptive dynamic programming(ADP) controller with online learning capability to improve transient response and harmonics.The proposed controller works alongside existing proportional integral(PI) controllers to efficiently track the reference currents in the d-q domain.It can generate adaptive control actions to compensate the PI controller.The proposed system was simulated under different nonlinear(three-phase full wave rectifier) load conditions.The performance of the proposed approach was compared with the traditional approach.We have also included the simulation results without connecting the traditional PI control based power inverter for reference comparison.The online learning based ADP controller not only reduced average total harmonic distortion by 18.41%,but also outperformed traditional PI controllers during transients. 展开更多
关键词 Adaptive dynamic programming(ADP) current controlled voltage source power inverter(CCVSI) online learning based controller neural networks shunt active filter(SAF) total harmonic distortion(THD)
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Genetic Algorithm Based Smart Grid System for Distributed Renewable Energy Sources
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作者 M.Mythreyee Dr A.Nalini 《Computer Systems Science & Engineering》 SCIE EI 2023年第4期819-837,共19页
This work presents the smart grid system for distributed Renewable Energy Sources(RES)with control methods.The hybrid MicroGrids(MG)are trending in small-scale power systems that involve distributed generations,power ... This work presents the smart grid system for distributed Renewable Energy Sources(RES)with control methods.The hybrid MicroGrids(MG)are trending in small-scale power systems that involve distributed generations,power storage,and various loads.RES of solar are implemented with boost converter using Maximum Power Point Tracking(MPPT)with perturb and observe technique to track the maximum power.Also,the wind system is designed by permanent magnet synchronous generator that includes boost converter with MPPT technique.The battery is also employed with a Direct Current(DC)-DC bidirectional converter,and has a state of charge.The MATLAB/Simulink Simscape software is used to design the proposed model.The switching element of all converters is metal oxide semiconductor field effect transistor.The hybrid system is controlled by a voltage source controller using Proportional Integral Derivative(PID)-Genetic Algorithm(GA),and inductors-capacitors filter is used to reduce the system’s harmonics.Also,smart meters are used for monitoring purposes in residential loads.This paper analyses the performances of the MG against various scenarios. 展开更多
关键词 Solar photovoltaic WIND BATTERY CONVERTER voltage sources controller MICROGRID
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Research on Control Strategy of Grid-connected Brushless Doubly-fed Wind Power System Based on Virtual Synchronous Generator Control 被引量:1
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作者 Shuai Liang Shi Jin Long Shi 《CES Transactions on Electrical Machines and Systems》 CSCD 2022年第4期404-412,共9页
The brushless doubly-fed wind power system based on conventional power control strategies lacks ‘inertia’ and the ability to support grid,which leads to the decline of grid stability.Therefore,a control strategy of ... The brushless doubly-fed wind power system based on conventional power control strategies lacks ‘inertia’ and the ability to support grid,which leads to the decline of grid stability.Therefore,a control strategy of brushless doubly-fed reluctance generator(BDFRG) based on virtual synchronous generator(VSG) control is proposed to solve the problem in this paper.The output characteristics of BDFRG based on VSG are similar to a synchronous generator(SG),which can support the grid frequency and increase the system ‘inertia’.According to the mathematical model of BDFRG,the inner loop voltage source control of BDFRG is derived.In addition,the specific structure and parameter selection principle of outer loop VSG control are expounded.The voltage source control inner loop of BDFRG is combined with the VSG control outer loop to establish the overall architecture of BDFRG-VSG control strategy.Finally,the effectiveness and feasibility of the proposed strategy are verified in the simulation. 展开更多
关键词 Virtual synchronous generator Brushless doubly-fed relutance generator Grid support ability voltage source control
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Analysis and stabilization control of a voltage source controlled wind farm under weak grid conditions
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作者 Shun SANG Chen ZHANG +2 位作者 Jianwen ZHANG Gang SHI Fujin DENG 《Frontiers in Energy》 SCIE CSCD 2022年第6期943-955,共13页
This paper investigates and discusses the interaction stability issues of a wind farm with weak grid connections,where the wind turbines(WTs)are controlled by a new type of converter control strategy referred to as th... This paper investigates and discusses the interaction stability issues of a wind farm with weak grid connections,where the wind turbines(WTs)are controlled by a new type of converter control strategy referred to as the voltage source(VS)control.The primary intention of the VS control method is to achieve the high-quality inertial response capability of a single WT.However,when it is applied to multiple WTs within a wind farm,its weakgrid performance regarding the stability remains concealed and needs to be clarified.To this end,a frequency domain model of the wind farm under the VS control is first developed.Based on this model and the application of a stability margin quantification index,not only the interactions between the wind farm and the weak grid but also those among WTs will be systematically assessed in this paper.A crucial finding is that the inertial response of VS control has negative impacts on the stability margin of the system,and the dominant instability mode is more related to the interactions among the WTs rather than the typical grid-wind farm interaction.Based on this knowledge,a stabilization control strategy is then proposed,aiming for stability improvements of VS control while fulfilling the demand of inertial responses.Finally,all the results are verified by time-domain simulations in power systems computer aided design/electromagnetic transients including DC(PSCAD/EMTDC). 展开更多
关键词 weak grids voltage source(VS)control wind turbine(WT) stabilization control wind farm inertial response
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