Control and stability of power inverters feeding renewable power to weak AC grids with no or low mechanical inertia

Kuehn, W.

doi:10.1109/psce.2009.4840232

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…The voltage declines with increasing power up to the maximum transferable power (MTP) level, once the MTP-Point has been reached, it will decline with decreasing power. In general, this PV-curve holds also for an HVDC system being connected to an AC grid of moderate stiffness Kuehn [2009]. On the upper branch, DC current rises in proportion to the ordered DC power.…”

Section: Voltage Collapse In Classic Hvdc Systemsmentioning

confidence: 86%

Real-time implementation of an Automatic Voltage Stabilizer for HVDC Control

Weyrich

Leelaruji

Kuehn

et al. 2012

2012 3rd IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

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Classic HVDC systems are prone to voltage instability when operating on weak AC grids. Certain methods are available to cope with weak system conditions, one of which is VDCOL. This paper describes the implementation of a newly developed Automatic Voltage Stabilizer (AVS) in an existing CIGRÉ Benchmark Model for HVDC Controls and compares its performance with the VDCOL method. The tools used for the study are the OPAL-RT real-time simulator and the PSCAD/EMTDC digital simulator. With AVS, the power transfer can be optimized and kept at or close to the steady state stability limit thereby compensating for deficiencies of VDCOL. Using two different simulation environments provides important information on their capabilities to develop and improve future power system controls.

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Section: Voltage Collapse In Classic Hvdc Systemsmentioning

confidence: 86%

Real-time implementation of an Automatic Voltage Stabilizer for HVDC Control

Weyrich

Leelaruji

Kuehn

et al. 2012

2012 3rd IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

Self Cite

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“…In microgrids, the inertia related to the inverters is considerably smaller than in the conventional network [21], because the sources are of small size and some have no rotating elements [22]. Therefore, stability of isolated microgrids depends mainly on a PFR strategy to maintain a reliable power supply.…”

Section: Inertia and Transient Response Of The Microgridmentioning

confidence: 99%

Optimal parameters of inverter-based microgrid to improve transient response

Pérez¹,

Candelo-Becerra²,

Hoyos³

2020

IJECE

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The inertia issues in a microgrid can be improved by modifying the inverter control strategies to represent a virtual inertia simulation. This method employs the droop control strategy commonly used to share the power of a load among different power sources in the microgrid. This paper utilizes a modified droop control that represents this virtual inertia and applies an optimization algorithm to determine the optimal parameters and improve transient response. The results show better control when different variations are presented in the loads, leading the microgrid to have a better control of the operation. The optimization method applied in this research allows improvement to the transient response, thus avoiding unnecessary blackouts in the microgrid. : received his Bs. degree in Electrical Engineering and his Master in Electrical Engineering from the Universidad Nacional de Colombia, Sede Medellín. He has worked on projects related to design of electrical substations, electrical risk classification, and coordination of protections. He participated in the design of the electromechanical equipment for medium and high voltage substations and transient phenomena studies, obtaining experience in power system analysis. His research interests include: renewable energy, microgrid, energy storage, and power system protection and control.

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“…As a result, internal voltage dynamics can be used to demonstrate the essential characteristics of grid-connected VSGs whatever control strategies are applied. Some control methods based on the internal voltage stability of VSCs integrated into a weak grid are studied [26,27]. The effects of inner control on system stability based on internal voltage theory was revealed and a linearized model is derived in [13].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Stability Analysis Based on Internal Voltage Dynamics in Synchronverter

et al. 2023

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With the large-scale centralized penetration of renewable energy represented by wind turbine and photovoltaic power generation, the equivalent inertia and synchronous torque of traditional power grids have decreased, which is worsening the frequency dynamics and threatening the stability and reliability of power grids. Virtual synchronous generators (VSGs) are a type of grid-friendly inverter in microgrids (MGs) that mimic rotational synchronous generators (SGs) to maintain system stability with the increasing penetration of power electronic converters. In this paper, the stability analysis method of one type of VSG, synchronverter, is investigated based on internal voltage dynamics. The torque components affecting the stability mechanism of synchronizing, inertia, and damping torque is introduced, which offers a physical insight into transient stability and dynamic performance. Insufficiency in either damping or synchronizing torque would increase the unstable possibility. The characterization method of stability mechanisms can be illustrated by the phasor diagram of synchronverter internal voltage. Some cases under different disturbances which change the pattern of synchronizing and damping torque and in turn influence the internal voltage dynamics of synchronverters, are also discussed. In addition, an auxiliary correction control loop is proposed and added in the synchronverter control loop to enhance the robustness of the synchronverter against disturbances. The tunable coefficient of the correction loop is analyzed based on the internal voltage method. Simulation results verify the validity of the internal voltage stability method in synchronverters.

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Control and stability of power inverters feeding renewable power to weak AC grids with no or low mechanical inertia

Cited by 12 publications

References 13 publications

Real-time implementation of an Automatic Voltage Stabilizer for HVDC Control

Real-time implementation of an Automatic Voltage Stabilizer for HVDC Control

Optimal parameters of inverter-based microgrid to improve transient response

Modeling and Stability Analysis Based on Internal Voltage Dynamics in Synchronverter

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