Distributed Reactive Power Control Scheme for the Voltage Regulation of Unbalanced LV Grids

Kryonidis, Georgios C.; Malamaki, Kyriaki-Nefeli D.; Gkavanoudis, Spyros I.; Oureilidis, Konstantinos O.; Kontis, Eleftherios O.; Mauricio, J.; Ortega, José María Maza

doi:10.1109/tste.2020.3042855

Cited by 18 publications

(9 citation statements)

References 27 publications

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“…The MVDs in active LVDGs can be leveraged for an effective and unconventional voltage management. In recent works, the MVD impact in LVDGs has been ignored or not explicitly exploited by either assuming a balanced operation [6], conducting voltage regulation in each phase individually [13] or by considering only three-phase inverters as the controllable assets [7]. In a different direction, an optimization problem for controlling the reactive power of the single-phase PV systems in a centralized manner is presented in ( 4)-( 8).…”

Section: B Reactive Power Compensation With Cross-phase Voltage Respo...mentioning

confidence: 99%

“…The objective function (4) aims to minimize the overall deployment of reactive power which results to lower grid losses and less stress on the PV inverters. The decision variables are the required reactive power deviations Δ𝑄 𝑖 (𝑡) , with 𝑖 ∈ {𝑎, 𝑏, 𝑐} , of each single-phase inverter such that there aren't any voltage violations (7) while the inverter limits for reactive regulation ( 8) are satisfied for the current time step 𝑡.…”

Section: B Reactive Power Compensation With Cross-phase Voltage Respo...mentioning

confidence: 99%

“…In addition, active power curtailment is used only if the available reactive power is not sufficient for preventing voltage violations. In [7], a rule based distributed method is presented for regulating the positive-sequence voltage with three-phase controllable inverters. Strategies that coordinate the charging of EVs in order to prevent thermal and voltage limit violations are presented in [8]- [9].…”

Section: Introductionmentioning

confidence: 99%

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Voltage Regulation Under Unbalanced Power Flow in Active Four-Wire Low Voltage Distribution Grids

Kotsonias

Asprou

Hadjidemetriou

et al. 2022

2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)

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The increasing penetration of distributed energy resources in Low Voltage Distribution Grids (LVDGs) has a severe impact on the grid's voltage profile. In active LVDGs the controllable assets are mainly single-phase inverters which most often they are unevenly distributed amongst the supply phases. The majority of voltage support schemes in the literature assume that the phases are decoupled and utilize the singlephase inverters in per-phase regulation methods. However, the particularities of LVDGs, namely the inductive coupling from the distribution lines and the neutral coupling from the fourth wire, can result to a strong phase coupling. Consequently, conventional voltage support schemes by single-phase inverters in active LVDGs can cause unbalanced power deviations in one phase and due to the phase coupling it can have a significant impact on the voltage of a different phase. In this paper, the phase coupling, its impact on voltage regulation, and the factors that contribute to its intensity are analysed. In addition, it is demonstrated how two traditional voltage regulation schemes become ineffective due to the phase coupling. Finally, a reactive power compensation scheme is presented that exploits the mutual voltage deviations induced by the phase couplings in order to improve the voltage regulation capabilities in LVDGs.

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Section: B Reactive Power Compensation With Cross-phase Voltage Respo...mentioning

confidence: 99%

Section: B Reactive Power Compensation With Cross-phase Voltage Respo...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Voltage Regulation Under Unbalanced Power Flow in Active Four-Wire Low Voltage Distribution Grids

Kotsonias

Asprou

Hadjidemetriou

et al. 2022

2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)

View full text Add to dashboard Cite

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“…The methods applied by the DSOs to mitigate voltage quality problems are based on changing the power flow in the network. This can be obtained through reactive power using PV inverters that operate according to Q-U strategies [16][17][18]. If a voltage reduction is needed, the PV inverter increases the reactive power drawn from the network (cosφ inductive), resulting in a higher voltage drop on the network impedance and, thus, decreased nodal voltages.…”

Section: Introductionmentioning

confidence: 99%

Modular PV System for Applications in Prosumer Installations with Uncontrolled, Unbalanced and Non-Linear Loads

Kelm,

Mieński,

Wasiak

2024

Energies

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This article proposes a modular system for prosumer installations composed of photovoltaic (PV) panels and energy storage (ES) integrated with the low voltage (LV) network through a common 4-wire AC/DC inverter. The novel idea is a control strategy for the inverter in which additional functionalities are incorporated. Apart from transmitting an active power generated by the PV source, the same inverter is used to manage energy generated by the PV and to compensate for the current unbalance, harmonics (including subharmonics and interharmonics) and reactive power of the prosumer loads. As a result of the algorithm operation, the currents flowing to the prosumer installation are sinusoidal, symmetrical and purely active, which results in voltage balancing and improving voltage waveforms at the point of common coupling (PCC). In this way, with the widespread use of this solution among prosumers, the impact of the prosumer installation on the distribution network is minimized, and power quality (PQ) disturbances such as unacceptable voltage rises, voltage unbalance and harmonics are avoided. The presented approach may be a solution to the problems network operators face nowadays due to the uncontrolled connection of PV sources. The proposed modular system is also beneficial for the prosumer as the instances of unacceptable overvoltage and, consequently, shutdowns of prosumer installations are reduced. The features of the proposed method are shown in relation to other means applied for PQ improvement in the networks with distributed generation. A principle of the control and the involving algorithm for the inverter is presented. The efficiency of the control strategy was tested in a simulation developed in the PSCAD/EMTDC program. The results of simulations are presented, and the proposed solution is concluded.

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“…However, there was rare work on the series side compensation. Meanwhile, plenty of researches have been done on VSC and MMC operation under unbalanced grid conditions (Li et al, 2018;Shang et al, 2019;Kryonidis et al, 2021). The multiple objective control method (Stefanov and Stankovic, 2002), modeling and operation analysis of UPFC with unbalanced conditions (Yang et al, 2020), the methods of the fault ride improvement of MMC-UPFC (Santos et al, 2014) have been discussed widely.…”

Section: Introductionmentioning

confidence: 99%

Passive Sliding Mode Controlled UPFC and its Treatment Strategy of Unbalanced Grid Conditions

et al. 2021

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Modular multilevel converter based unified power flow controller (MMC-UPFC) can provide flexible power regulation and plays an important role in the smart grid and future distribution networks. PI controller is widely adopted in the Unified power flow controller (UPFC) control. However, it is often difficult to figure out a pair of stable control parameters with good dynamic performance. A passive sliding mode control strategy of MMC-UPFC is proposed in this paper to achieve the advantages of both the passive controller and sliding mode controller. The proposed passive sliding mode control strategy has a fast response speed and is not sensitive to system parameter variation. Since unbalance grid voltage conditions are common in the modern distribution networks, an unbalanced grid treatment strategy is also presented with the series side of MMC-UPFC. Negative sequence components of the grid voltages are detected by the cross-decoupling method with second order generalized integrator and then compensated by the series side of MMC-UPFC. The series side converter controls the power flow and treats unbalanced grid conditions simultaneously. The efficiency of the general device is increased thus. A 27-level MMC-UPFC simulation system is built based on the Shanghai UPFC Project and validate the proposed approach.

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Distributed Reactive Power Control Scheme for the Voltage Regulation of Unbalanced LV Grids

Cited by 18 publications

References 27 publications

Voltage Regulation Under Unbalanced Power Flow in Active Four-Wire Low Voltage Distribution Grids

Voltage Regulation Under Unbalanced Power Flow in Active Four-Wire Low Voltage Distribution Grids

Modular PV System for Applications in Prosumer Installations with Uncontrolled, Unbalanced and Non-Linear Loads

Passive Sliding Mode Controlled UPFC and its Treatment Strategy of Unbalanced Grid Conditions

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