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Centralized-local PV voltage control considering opportunity constraint of short-term fluctuation
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作者 Hanshen Li Wenxia Liu Lu Yu 《Global Energy Interconnection》 EI CAS CSCD 2023年第1期81-91,共11页
This study proposes a two-stage photovoltaic(PV)voltage control strategy for centralized control that ignores short-term load fluctuations.In the first stage,a deterministic power flow model optimizes the 15-minute ac... This study proposes a two-stage photovoltaic(PV)voltage control strategy for centralized control that ignores short-term load fluctuations.In the first stage,a deterministic power flow model optimizes the 15-minute active cycle of the inverter and reactive outputs to reduce network loss and light rejection.In the second stage,the local control stabilizes the fluctuations and tracks the system state of the first stage.The uncertain interval model establishes a chance constraint model for the inverter voltage-reactive power local control.Second-order cone optimization and sensitivity theories were employed to solve the models.The effectiveness of the model was confirmed using a modified IEEE 33 bus example.The intraday control outcome for distributed power generation considering the effects of fluctuation uncertainty,PV penetration rate,and inverter capacity is analyzed. 展开更多
关键词 ADN Inverter control Short-term volatility Chance constraint optimization Centralized-local control
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Coordinated control between a grid forming inverter and grid following inverters suppling power in a standalone microgrid 被引量:1
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作者 Junichi Arai Yasuhiro Taguchi 《Global Energy Interconnection》 EI CAS CSCD 2022年第3期259-265,共7页
Battery energy storage systems,fuel cells,and photovoltaic generators are being adopted in distribution networks to achieve CO;emission reduction.These power sources require inverters to connect to AC networks.However... Battery energy storage systems,fuel cells,and photovoltaic generators are being adopted in distribution networks to achieve CO;emission reduction.These power sources require inverters to connect to AC networks.However,sub-networks,such as a microgrids containing inverter power sources,may be disconnected from the utility network and operated in a standalone mode during extended blackouts.This study focuses on a standalone microgrid supplied by inverter power sources without a synchronous generator and proposes a new microgrid inverter control.In this inverter control,a single grid forming inverter is operated as a master power source to determine frequency and voltage,and other inverters,called grid following inverters,are operated as subordinate power sources with active and reactive power control.The necessary functions in the energy management system are examined,and the coordinated operation of all inverters in the microgrid is demonstrated via simulation. 展开更多
关键词 Inverter control MICROGRID Standalone operation Energy management system Grid forming inverter Grid following inverter
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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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Sizing of a Filter (<i>L-C</i>) for a 180°Control Inverter Connected to a Medium Voltage Network
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作者 Kouakou Fernand Koffi Gondo Yake +2 位作者 Raymond Gbegbe Georges Loum Olivier Asseu 《Open Journal of Applied Sciences》 2021年第5期565-576,共12页
This paper studies the design and sizing of a filter (<em>L-C</em>) for an inverter with 180<span style="white-space:nowrap;"><span style="white-space:nowrap;">&#176;<... This paper studies the design and sizing of a filter (<em>L-C</em>) for an inverter with 180<span style="white-space:nowrap;"><span style="white-space:nowrap;">&#176;</span></span> control in Medium voltage (MV), based on formulas of the capacitance of the capacitor <em>C</em> and the inductance <em>L</em> of the filter (<em>L-C</em>) of an SPWM inverter. These formulas were obtained by minimizing two parameters: the reactive power of the capacitor (capped at 5% of the apparent power of the load) and the ripple of the current flowing through inductance <em>L</em> (capped at 10% of the current supplying the load). The application of these formulas for the calculation of the filter (<em>L-C</em>) of the 180<span style="white-space:nowrap;">&#176;</span> control inverter in MV is not conclusive. Studies have been carried out to make them applicable. The results show that limiting the current ripple in the inductor to 10% of the load current is a valid assumption and that limiting the reactive power of the capacitor to 5% of the apparent power of the load presents shortcomings. The results also show that setting the inductance <em>L</em> of the filter to <em>L<sub>maxi </sub></em>and the capacitor <em>C </em>from 35 × <em>C<sub>maxi</sub></em> to 400 × <em>C</em><em><sub>maxi </sub></em>gives voltage and current THDs that meet the 519 IEEE-2014 standards. 展开更多
关键词 filter (L-C) THD inverter with 180° control and with SPWM control mathematical iterations MV. MATLAB-SIMULINK
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Transient Angle Stability of Inverters Equipped with Robust Droop Control 被引量:2
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作者 Chen Qi Keyou Wang +2 位作者 Qing-Chang Zhong Jin Xu Guojie Li 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第2期659-670,共12页
Transient angle stability of inverters equipped with the robust droop controller is investigated in this work.At first,the conditions on the control references to guarantee the existence of a feasible post-disturbance... Transient angle stability of inverters equipped with the robust droop controller is investigated in this work.At first,the conditions on the control references to guarantee the existence of a feasible post-disturbance operating point are derived.Then,the post-disturbance equilibrium points are found and their stability properties are characterized.Furthermore,the attraction regions of the stable equilibrium points are accurately depicted by calculating the stable and unstable manifolds of the surrounding unstable equilibrium points,which presents an explanation to system transient stability.Finally,the transient control considerations are provided to help the inverter ridethrough the disturbance and maintain its stability characteristics.It is shown that the transient angle stability is not a serious problem for droop controlled inverters with proper control settings. 展开更多
关键词 Droop controlled inverter equilibrium point transient angle stability (un)stable manifold
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Enabling Inverter-based Resource Stability Control in Power Systems with High Renewable Penetration
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作者 Joe H.Chow 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第3期1248-1250,共3页
This rapid communication provides the author’s viewpoints on the need to develop grid stability functions for inverter-based resources,in particular,controls to enhance system stability.This discussion will be focuse... This rapid communication provides the author’s viewpoints on the need to develop grid stability functions for inverter-based resources,in particular,controls to enhance system stability.This discussion will be focused on transient stability and frequency regulation.Some future research directions are also presented. 展开更多
关键词 Frequency regulation inverter control time scales transient stability
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A dual control strategy for power sharing improvement in islanded mode of AC microgrid 被引量:5
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作者 Suleman Haider Guojie Li Keyou Wang 《Protection and Control of Modern Power Systems》 2018年第1期121-128,共8页
Parallel operation of inverter modules is the solution to increase the reliability,efficiency,and redundancy of inverters in microgrids.Load sharing among inverters in distributed generators(DGs)is a key issue.This st... Parallel operation of inverter modules is the solution to increase the reliability,efficiency,and redundancy of inverters in microgrids.Load sharing among inverters in distributed generators(DGs)is a key issue.This study investigates the feasibility of power-sharing among parallel DGs using a dual control strategy in islanded mode of a microgrid.PQ control and droop control techniques are established to control the microgrid operation.P-f and Q-E droop control is used to attain real and reactive power sharing.The frequency variation caused by load change is an issue in droop control strategy whereas the tracking error of inverter power in PQ control is also a challenge.To address these issues,two DGs are interfaced with two parallel inverters in an islanded AC microgrid.PQ control is investigated for controlling the output real and reactive power of the DGs by assigning their references.The inverter under enhanced droop control implements power reallocation to restore the frequency among the distributed generators with predefined droop characteristics.A dual control strategy is proposed for the AC microgrid under islanded operation without communication link.Simulation studies are carried out using MATLAB/SIMULINK and the results show the validity and effective power-sharing performance of the system while maintaining a stable operation when the microgrid is in islanding mode. 展开更多
关键词 MICROGRID Inverter parallel operation control strategy Droop control strategy Frequency restore Power sharing
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Transmission line protection challenges influenced by inverter-based resources:a review 被引量:5
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作者 Juan Carlos Quispe Eduardo Orduña 《Protection and Control of Modern Power Systems》 2022年第1期406-422,共17页
High penetration of renewable energy sources(RES)leads to new challenges for protection devices.Protection schemes are typically designed according to the dynamic behavior of rotating machines as generation sources,wh... High penetration of renewable energy sources(RES)leads to new challenges for protection devices.Protection schemes are typically designed according to the dynamic behavior of rotating machines as generation sources,while the RES dynamic response,mainly governed by inverters,is not considered.Consequently,some relevant algorithms of transmission line protection are experiencing challenges because of the fact that magnitude and phase angle com-parison,amount of negative-sequence,and short-circuit current level are affected by the RES.Therefore,an in-depth study of this issue is necessary,one which considers the main causes and new methodological criteria solutions.This work presents an extensive literature review of the evaluation of electrical protection performance and the effects of RES connected to a power grid through inverters.Bibliographic data on many representative publications related to this topic are obtained to show the current research lines and their proposed solutions.In addition,this work identi-fies the main protection functions affected and describes the new protection schemes that consider RES.Finally,an analysis and discussion of the selected bibliography are presented. 展开更多
关键词 Inverter-based resources Inverter control system Photovoltaic plant Transmission line protection Wind farm
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