Overview of LVRT-capability pre-evaluation with an inverter based test bench

Uphues, Andreas; Notzold, Kilian; Griessel, Richard; Wegener, Ralf; Soter, Stefan

doi:10.1109/isie.2015.7281562

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…where V + is given in pu at the PCC and k + usually takes values within the interval (0-10). It can be deduced that a 10% dead-band is considered in (10) [39]. As highlighted in [40], the injection of positive sequence current does not reduce the unbalance at the PCC, so recent grid codes require the injection of inductive negative sequence current proportional to the negative sequence voltage at the PCC, according to (11) [16]:…”

Section: Low-voltage Ride-through Of the MMC Statcommentioning

confidence: 99%

Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM

et al. 2017

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Grid faults are common in power systems and can have a severe impact on the operation of the converters in the system. In this paper, the operation of a Modular Multilevel Converter (MMC)-based Static Synchronous Compensators (STATCOM) is investigated during grid faults. The study focuses on the challenging internal control of the converter to allow the independent control of the energy levels of each arm, with the goal to maintain internal balancing of the MMC during contingencies. Extensive experimental results highlight the need for a sophisticated internal control. Moreover, the experimental analysis verifies that, by using the proposed control structure, the MMC can effectively ride through a fault on the AC side without tripping, while injecting the necessary positive and negative sequence reactive current levels according to the most recent grid codes.

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Section: Low-voltage Ride-through Of the MMC Statcommentioning

confidence: 99%

Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM

et al. 2017

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“…Besides the dynamic interactions within CVG, the external control of CVG may also interact with the AFE through the dc link of grid emulators, and with the control dynamics of DUT, posing multifold challenges to the dynamics of grid emulators. In [12], [19], [20], it has been reported that an FRT test by CVG may result in the over-/ under-voltage at the common dc link, which can cause the overmodulation or even instability of CVG. In addition, the time delay involved in the digital control system can introduce a negative resistance into the output impedance of CVG and DUT, which may destabilize their interactions [3], [21].…”

Section: Introductionmentioning

confidence: 99%

Medium-Voltage Megawatt Power-Electronic-Based Grid Emulators: Testing Capability Requirements and Dynamics Challenges—A Review

Zhao

Wang

et al. 2024

IEEE J. Emerg. Sel. Topics Power Electron.

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Power-electronic-based grid emulators are emerging as a promising way to test the grid-code compliance of renewable energy resources. Yet, the ever-increasing power and voltage levels of device under test pose new requirements and challenges to power-electronic-based grid emulators. This paper first gives an overview of testing capability requirements based on the recent grid codes and standards, then discusses the resulted dynamic interactions and solutions for power-electronic-based grid emulators. Perspectives on the open issues and emerging trends of grid emulators are finally shared.

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“…This function shows the voltage disturbance area at the grid connection point that must be withstood by the facility. A capability that must not only be verified, but also certificated [12,13].…”

Section: Introductionmentioning

confidence: 99%

Voltage Support Experimental Analysis of a Low-Voltage Ride-Through Strategy Applied to Grid-Connected Distributed Inverters

et al. 2018

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In recent decades, different control strategies have been designed for the increasing integration of distributed generation systems. These systems, most of them based on renewable energies, use electronic converters to exchange power with the grid. Capabilities such as low-voltage ride-through and reactive current injection have been experimentally explored and reported in many research papers with a single inverter; however, these capabilities have not been examined in depth in a scenario with multiple inverters connected to the grid. Only few simulation works that include certain methods of reactive power control to solve overvoltage issues in low voltage grids can be found in the literature. Therefore, the overall objective of the work presented in this paper is to provide an experimental analysis of a low-voltage ride-through strategy applied to distributed power generation systems to help support the grid during voltage sags. The amount of reactive power will depend on the capability of each inverter and the amount of generated active power. The obtained experimental results demonstrate that, depending on the configuration of distributed generation, diverse inverters could have different control strategies. In the same way, the discussion of these results shows that the present object of study is of great interest for future research.

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Overview of LVRT-capability pre-evaluation with an inverter based test bench

Cited by 6 publications

References 4 publications

Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM

Internal Balance during Low-Voltage-Ride-Through of the Modular Multilevel Converter STATCOM

Medium-Voltage Megawatt Power-Electronic-Based Grid Emulators: Testing Capability Requirements and Dynamics Challenges—A Review

Voltage Support Experimental Analysis of a Low-Voltage Ride-Through Strategy Applied to Grid-Connected Distributed Inverters

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