Evaluation of sensitivity based coordinated volt-var control and local reactive power for voltage regulation and power exchange across system boundaries in smart distribution networks

Khan, Sohail; Zehetbauer, Paul; Schwalbe, Roman

doi:10.1016/j.epsr.2020.106975

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…Local control schemes (also known as droop-based control strategies) provide loc control of reactive power supply through the characteristic curves [26]. There are sever methods that are attributed to local control through PV inverters on the user side [38,3 First, Q(U) droop control (reactive power output is a node voltage function), and secon Q(P) droop control (reactive power output is a PV active power function). The Q( method may cause an instability issue if the droop curve has incorrect parameters, an the Q(P) method does not take this concern into account [27].…”

Section: Local (Autonomous) Controlmentioning

confidence: 99%

“…In the constant PF technique, DER inverters must operate at a target PF set by the power system operator, independent of DER location or feed-in active power levels, as illustrated in Figure 7a. cos (ϕ)(P) controls the PF as the active power function, and the maximum power factor is 0.95 [36,38,39]. This method has a clear possibility of regulation, but does not take into account the actual network voltage and may, therefore, cause unnecessary Q flows and losses [38,39].…”

Section: Local (Autonomous) Controlmentioning

confidence: 99%

“…cos (ϕ)(P) controls the PF as the active power function, and the maximum power factor is 0.95 [36,38,39]. This method has a clear possibility of regulation, but does not take into account the actual network voltage and may, therefore, cause unnecessary Q flows and losses [38,39].…”

Section: Local (Autonomous) Controlmentioning

confidence: 99%

“…The above shortcomings are eliminated by Q(U), as it generates or uses reactive power if the voltage at the connection point outside the dead-band reduces the network losses. The efficiency of the methods depends on the R/X ratio and the voltage distribution in the power line [38,39].…”

Section: Local (Autonomous) Controlmentioning

confidence: 99%

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Analysis of Voltage and Reactive Power Algorithms in Low Voltage Networks

Stanelytė

Radziukynas

2022

Energies

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The rapid development of renewable energy sources and electricity storage technologies is further driving the change and evolution of traditional energy systems. The aim is to interconnect the different electricity systems between and within countries to ensure greater reliability and flexibility. However, challenges are faced in reaching it, such as the power grid complexity, the system control, voltage fluctuations due to the reverse power flow, equipment overloads, resonance, incorrect island setting, and the diversity of user needs. The electricity grid digitalization in the market also requires the installation of smart devices to enable real-time information exchange between the generator and the user. Inverter-based distributed generation (DG) may be used to control the grid voltage. Smart PV inverters have the capability to supply both inductive and capacitive reactive power to control the voltage at the point of interconnection with the grid, and only technical parameters of smart PV inverters limit this capability. Reactive power control is related to ensuring the quality of voltage in the electricity distribution network and compensating reactive power flows, which is a technical–economic aspect. The goal of this research is to present an analysis of controllers that supply reactive power to the electrical grid via PV systems. This research analyzes recent research on local, centralized, distributed, and decentralized voltage control models in distribution networks. The article compares various approaches and highlights their advantages and disadvantages. The voltage control strategies and methodologies mentioned in the article can serve as a theoretical foundation and provide practical benefits for PV system development in distribution networks. The results of the research show that the local voltage control approach, as well as linear and intelligent controllers, has great potential.

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Section: Local (Autonomous) Controlmentioning

confidence: 99%

Section: Local (Autonomous) Controlmentioning

confidence: 99%

Section: Local (Autonomous) Controlmentioning

confidence: 99%

Section: Local (Autonomous) Controlmentioning

confidence: 99%

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Analysis of Voltage and Reactive Power Algorithms in Low Voltage Networks

Stanelytė

Radziukynas

2022

Energies

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“…The level of reactive power in a network is reflected in the voltage [1,2]. Safe and reliable operation is a basic requirement of an electricity system [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

2021

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The main emphasis in the operation of an electricity system is placed on its safe and reliable operation. The flow of reactive power in a network can affect voltage conditions in individual nodes of the transmission system. In recent years, there have been changes in the network that have resulted in increased capacitive reactive power flows from lower voltage levels to higher ones. These flows can cause the voltage to rise above the limit. This paper examines recent changes in the reactive power transmission in the network, especially at lower voltage levels. The possible impact of these changes on the flow of capacitive reactive power at higher voltage levels is analyzed. This paper also presents a description and the simulated impact of power lines at different voltage levels on reactive power flows. Real measurements of different types of consumers at the low-voltage (LV) level are analyzed. Finally, a simulation model was created to simulate the impact of a customer’s power contribution to the reactive power flows from the point of view of a 110 kV voltage node. This node is characterized as a supply point.

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Impact and assessment of the overvoltage mitigation methods in low‐voltage distribution networks with excessive penetration of PV systems: A review

Hamza

Sedhom

Badran

2021

Int Trans Electr Energ Syst

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This paper presents an overview of the impact of high penetration of photovoltaic (PV) systems in low-voltage distribution networks (LVDNs). High integration of solar PVs in the LVDNs has severe implications on the system parameters, efficiency, and stability. This paper also introduces the methods that have been driven to overcome these effects to preserve the steady-state conditions in the system during excessive penetration of PV generation units. A comparison between the contributions and shortcomings of the most recent researches for overvoltage mitigation strategies has been driven. Also, it includes comparing different overvoltage mitigation methods to handle the impact of the overvoltage under high penetration of PV units in the LVDNs. Besides, it presents a comparison between overvoltage mitigation methods based on their pros and cons.

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Evaluation of sensitivity based coordinated volt-var control and local reactive power for voltage regulation and power exchange across system boundaries in smart distribution networks

Cited by 8 publications

References 27 publications

Analysis of Voltage and Reactive Power Algorithms in Low Voltage Networks

Analysis of Voltage and Reactive Power Algorithms in Low Voltage Networks

Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

Impact and assessment of the overvoltage mitigation methods in low‐voltage distribution networks with excessive penetration of PV systems: A review

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