Voltage Control in Low-Voltage Grids Using Distributed Photovoltaic Converters and Centralized Devices

Ciocia, Alessandro; Boicea, Valentin A.; Chicco, Gianfranco; Leo, Paolo Di; Mazza, Andrea; Pons, Enrico; Spertino, Filippo; Hadjsaïd, Nourédine

doi:10.1109/tia.2018.2869104

Cited by 36 publications

(15 citation statements)

References 36 publications

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“…The five identified cases are depicted in Figures 5-9. For each case is derived a specific equation from the generalized form presented in Equation (1) that describes all elements involved in the VVC chain, Equations (6)- (10). It is supposed that neither DSts nor DGs are connected to the LV_link-grids.…”

Section: Simulated Control Setupsmentioning

confidence: 99%

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Behaviour of Distribution Grids with the Highest PV Share Using the Volt/Var Control Chain Strategy

Schultis

Ilo

2019

Energies

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The large-scale integration of rooftop PVs stalls due to the voltage limit violations they provoke, the uncontrolled reactive power flow in the superordinate grids and the information and communications technology (ICT) related challenges that arise in solving the voltage limit violation problem. This paper attempts to solve these issues using the LINK-based holistic architecture, which takes into account the behaviour of the entire power system, including customer plants. It focuses on the analysis of the behaviour of distribution grids with the highest PV share, leading to the determination of the structure of the Volt/var control chain. The voltage limit violations in low voltage grid and the ICT challenge are solved by using concentrated reactive devices at the end of low voltage feeders. Q-Autarkic customer plants relieve grids from the load-related reactive power. The optimal arrangement of the compensation devices is determined by a series of simulations. They are conducted in a common model of medium and low voltage grids. Results show that the best performance is achieved by placing compensation devices at the secondary side of the supplying transformer. The Volt/var control chain consists of two Volt/var secondary controls; one at medium voltage level (which also controls the TSO-DSO reactive power exchange), the other at the customer plant level.

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Section: Simulated Control Setupsmentioning

confidence: 99%

“…Implementing PVs on the rooftop of each customer requires the coordination of millions of local controllers needed to operate the power system reliably and securely. A flood of data exchange is necessary that poses serious challenges to ICT, cyber security and data privacy [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Distribution Grids with the Highest PV Share Using the Volt/Var Control Chain Strategy

Schultis

Ilo

2019

Energies

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“…In particular conditions of high power demand, the power semiconductor's in the converter can suffer from high thermal stress, that is further worsened by intermittent power fluctuations. To reduce the thermal stress for the semiconductors, the grid forming converter can exploit its voltage control feature to shape the load consumption in controlled way and thus to damp the power variations at grid forming converter level [8]- [10]. The possibility to decrease the load consumption by lowering the voltage has been already considered in the Conservation Voltage Regulation (CVR) approach for energy saving purposes [11], and in the voltage-led load management to provide demand response capability to the distribution grid without the need of a communication infrastructure [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

Load-Dependent Active Thermal Control of Grid-Forming Converters

Andresen

Carne

Liserre

2020

IEEE Trans. on Ind. Applicat.

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Grid forming converters enable an asynchronous connection of grids, which opens new opportunities for the power system management. This includes the potential to control the amplitude and the frequency of the grid voltage to vary the power consumption of the loads and the generation in the grid. Depending on the load sensitivity to voltage and frequency, the power transfer of the grid forming converter changes. Remarkably, this has an impact on the power semiconductors by means of thermal stress, which is limiting the lifetime of the devices. This work aims to investigate and mitigate the thermal stress in grid-forming converters by applying a load voltagesensitivity control. Depending on the nature of the loads, their power consumption varies with the voltage. This response is dependent on the connected loads and can be characterized by constant power (independent from the voltage), constant current (linearly dependent on the voltage) and constant impedance behavior (squared-dependent on the voltage). The sensitivity to voltage is exploited to control the load power consumption, reducing the junction temperature fluctuations and thus the power semiconductors stress.

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“…In particular, an enormous growth of installed PV plants has occurred: the installed capacity of PVs throughout the world was 5.1 GW in 2005 and increased to 227 GW by the end of 2015 [3]. It is anticipated that this trend is likely to continue, as demonstrated by various papers investigating the effect and potential application of PV for the electric system (e.g., references [4,5]).…”

Section: Introductionmentioning

confidence: 99%

Detection of Typical Defects in Silicon Photovoltaic Modules and Application for Plants with Distributed MPPT Configuration

et al. 2019

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During their operational life, photovoltaic (PV) modules may exhibit various defects for poor sorting of electrical performance during manufacturing, mishandling during transportation and installation, and severe thermo-mechanical stresses. Electroluminescence testing and infrared thermographic imaging are the most common tests for checking these defects, but they are only economically viable for large PV plants. The defects are also manifested as abnormal electrical properties of the affected PV modules. For defect diagnosis, the appropriate parameters on their I-V curves are open circuit voltage, photo-generated current, series resistance, and the shunt resistance. The health of PV modules can be assessed by calculating these values and comparing them with the reference parameters. If these defects are diagnosed in time, the power loss is avoided and safety hazards are mitigated. This paper first presents a review of common defects in PV modules and then a review of the methods used to find the above-mentioned parameters during the normal PV operation. A simple approach to determine the resistances of the equivalent circuit is discussed. Finally, through a modification in an ordinary maximum power point tracking (MPPT) algorithm, information about the state of health of PV modules is obtained. This method is effective, especially if applied to submodule-integrated MPPT architectures.

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Voltage Control in Low-Voltage Grids Using Distributed Photovoltaic Converters and Centralized Devices

Cited by 36 publications

References 36 publications

Behaviour of Distribution Grids with the Highest PV Share Using the Volt/Var Control Chain Strategy

Behaviour of Distribution Grids with the Highest PV Share Using the Volt/Var Control Chain Strategy

Load-Dependent Active Thermal Control of Grid-Forming Converters

Detection of Typical Defects in Silicon Photovoltaic Modules and Application for Plants with Distributed MPPT Configuration

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