scholarly journals Affinely Adjustable Robust Volt/VAr Control without Centralized Computations

2021 ◽  
Author(s):  
Firdous Ul Nazir ◽  
Bikash Pal ◽  
Rabih Jabr
Keyword(s):  
Reactive Power ◽  
Decision Rules ◽  
Optimization Theory ◽  
Distribution Networks ◽  
Network Partition ◽  
Solar Photovoltaics ◽  
Pv Inverter ◽  
High Penetration ◽  
Alternating Direction ◽  
Smart Inverters

<div>This paper proposes a completely non-centralized Volt/VAr control (VVC) algorithm for active distribution networks which are faced with voltage magnitude violations due to the high penetration of solar photovoltaics (PVs). The proposed VVC algorithm employs a two-stage architecture where the settings of the classical voltage control devices (VCDs) are decided in the first stage through a distributed optimization engine powered by the alternating direction method of multipliers (ADMM). In contrast, the PV smart inverters are instructed in the second stage through linear Q(P) decision rules - which are computed in a decentralized manner by leveraging robust optimization theory. The key to this non-centralized VVC routine is a proposed network partition methodology (NPM) which uses an electrical distance metric based on node Q􀀀jV j2 sensitivitiesfor computing an intermediate reduced graph of the network, which is subsequently divided into the final partitions using the spectral clustering technique. As a result, the final network partitions are connected, stable, close in cardinality, contain at least one PV inverter for zonal reactive power support, and are sufficiently decoupled from each other. Numerical results on the UKGDS-95 bus system show that the non-centralized solutions match closely with the centralized robust VVC schemes, thereby significantly reducing the voltage violations compared to the traditional deterministic VVC routines.</div>

scholarly journals Affinely Adjustable Robust Volt/VAr Control without Centralized Computations

2021 ◽  
Author(s):  
Firdous Ul Nazir ◽  
Bikash Pal ◽  
Rabih Jabr
Keyword(s):  
Reactive Power ◽  
Decision Rules ◽  
Optimization Theory ◽  
Distribution Networks ◽  
Network Partition ◽  
Solar Photovoltaics ◽  
Pv Inverter ◽  
High Penetration ◽  
Alternating Direction ◽  
Smart Inverters

<div>This paper proposes a completely non-centralized Volt/VAr control (VVC) algorithm for active distribution networks which are faced with voltage magnitude violations due to the high penetration of solar photovoltaics (PVs). The proposed VVC algorithm employs a two-stage architecture where the settings of the classical voltage control devices (VCDs) are decided in the first stage through a distributed optimization engine powered by the alternating direction method of multipliers (ADMM). In contrast, the PV smart inverters are instructed in the second stage through linear Q(P) decision rules - which are computed in a decentralized manner by leveraging robust optimization theory. The key to this non-centralized VVC routine is a proposed network partition methodology (NPM) which uses an electrical distance metric based on node Q􀀀jV j2 sensitivitiesfor computing an intermediate reduced graph of the network, which is subsequently divided into the final partitions using the spectral clustering technique. As a result, the final network partitions are connected, stable, close in cardinality, contain at least one PV inverter for zonal reactive power support, and are sufficiently decoupled from each other. Numerical results on the UKGDS-95 bus system show that the non-centralized solutions match closely with the centralized robust VVC schemes, thereby significantly reducing the voltage violations compared to the traditional deterministic VVC routines.</div>

scholarly journals Mitigation of overvoltage due to high penetration of solar photovoltaics using smart inverters volt/var control

2020 ◽  
Vol 19 (3) ◽  
pp. 1259
Author(s):  
Dilini Almeida ◽  
Jagadeesh Pasupuleti ◽  
Janaka Ekanayake ◽  
Eshan Karunarathne
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Distribution Networks ◽  
Solar Photovoltaics ◽  
Pv Inverter ◽  
High Penetration ◽  
Smart Control ◽  
Power Capability ◽  
Pv Penetration ◽  
Smart Inverters

The modern photovoltaic (PV) inverters are embedded with smart control capabilities such as Volt/Var and Volt/Watt functions to mitigate overvoltage issues. The Volt/Var control has gained a significant attention in regulating grid voltage through reactive power compensation. However, the reactive power capability of a PV inverter is limited during peak irradiance and could be improved by curtailing the active power generation and by oversizing the PV inverter. This paper analyzes the performance of Volt/Var function of smart PV inverters in mitigating overvoltage issues due to high PV integration and thus increasing the hosting capacity of low voltage distribution networks (LVDNs). The study is conducted on a real Malaysian LVDN considering two different Volt/Var set points under different PV penetration levels. Results demonstrate that the oversized smart PV inverter could enhance the Volt/Var functionality by increasing its reactive power capability than a typical smart PV inverter. Further it reveals that adaptation of sensitive Volt/Var set points with shorter deadbands increase the PV hosting capacity of LVDNs.

Network Partition and Voltage Coordination Control for Distribution Networks With High Penetration of Distributed PV Units

2018 ◽  
Vol 33 (3) ◽  
pp. 3396-3407 ◽  
Author(s):  
Yuanyuan Chai ◽  
Li Guo ◽  
Chengshan Wang ◽  
Zongzheng Zhao ◽  
Xiaofeng Du ◽  
...  
Keyword(s):  
Distribution Networks ◽  
Coordination Control ◽  
Network Partition ◽  
High Penetration

scholarly journals Performance Evaluation of Solar PV Inverter Controls for Overvoltage Mitigation in MV Distribution Networks

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1456
Author(s):  
Dilini Almeida ◽  
Jagadeesh Pasupuleti ◽  
Shangari K. Raveendran ◽  
M. Reyasudin Basir Khan
Keyword(s):  
Network Performance ◽  
Reactive Power ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Operating Conditions ◽  
Support Network ◽  
Control Technique ◽  
Solar Pv ◽  
Pv Inverter ◽  
Fixed Power

The incorporation of real and reactive power control of solar photovoltaic (PV) inverters has received significant interest as an onsite countermeasure to the voltage rise problem. This paper presents a comprehensive analysis of the involvement of active power curtailment and reactive power absorption techniques of solar PV inverters for voltage regulation in medium voltage (MV) distribution networks. A case study has been conducted for a generic MV distribution network in Malaysia, demonstrating the effectiveness of fixed power factor control, Volt–Var, and Volt–Watt controls in mitigating overvoltage issues that have arisen due to the extensive integration of solar PV systems. The results revealed that the incorporation of real and reactive power controls of solar PV inverters aids in successfully mitigating overvoltage issues and support network operating conditions. Furthermore, the comparative analysis demonstrated the importance of employing the most appropriate control technique for improved network performance.

scholarly journals Distribution Network Voltage Control Based on Coordinated Optimization of PV and Air-Conditioning

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Qi Wang ◽  
Bin Lu ◽  
Xiaobo Dou ◽  
Yichao Sun ◽  
Jin Liu
Keyword(s):  
Control Strategy ◽  
Air Conditioning ◽  
Reactive Power ◽  
Distribution Networks ◽  
Voltage Sensitivity ◽  
Optimal Control Strategy ◽  
Coordinated Optimization ◽  
High Penetration ◽  
Node Voltage

This paper proposes a coordinated optimal control strategy of PV generators and air-conditioning loads, in order to handle the possible voltage beyond limit issues resulting from high penetration of PV generators in the distribution networks. This strategy is achieved via coordinately considering the node voltage sensitivity and the adjustment-compensation bid model, to improve the economy of the whole system. As a result, the shortage of the PVs’ reactive power control capability is compensated by the adjustable air-conditioning loads, so that the waste of the photovoltaic power can be reduced or even avoided. The case study using an IEEE standard 33-node system, which is further updated with the installation of 5 PV generators and 5 air-conditioning loads, validates the correctness and effectiveness of the proposed control strategy.

scholarly journals Assessment for Voltage Violations considering Reactive Power Compensation Provided by Smart Inverters in Distribution Network

2021 ◽  
Vol 9 ◽  
Author(s):  
Jindi Hu ◽  
Weibin Yin ◽  
Chengjin Ye ◽  
Weidong Bao ◽  
Jiajia Wu ◽  
...  
Keyword(s):  
Reactive Power ◽  
Low Cost ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Reactive Power Compensation ◽  
Slice Sampling ◽  
Voltage Deviation ◽  
Regulation Model ◽  
Smart Inverters ◽  
Voltage Violation

Due to the high proportion of renewable energies, traditional voltage regulation methods such as on-load tap changers (OLTCs) and switching capacitors (SCs) are currently facing the challenge of providing fast, step-less, and low-cost reactive power to reduce the increasing risks of voltage violations in distribution networks (DNs). To meet such increasing demand for voltage regulation, smart inverters, including photovoltaics (PVs) and electric vehicle (EV) chargers, stand out as a feasible approach for reactive power compensation. This paper aims to assess the voltage violation risks in DNs considering the reactive power response of smart inverters. Firstly, reactive power compensation models of PVs and EV chargers are investigated and voltage deviation indexes of the regulation results are proposed. Moreover, kernel density estimation (KDE) and slice sampling are adopted to provide the PV output and EV charging demand samples. Then, the risk assessment is carried out with a voltage regulation model utilizing OLTCs, SCs, and available smart inverters. Numerical studies demonstrate that the reactive power support from smart inverters can significantly mitigate the voltage violation risks and reduce the switching and cost of OLTCs and capacitors in DNs.

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