Impact of PV generation on low voltage networks

2012 ◽  
Author(s):  
M. H. Hairi ◽  
Shaofan Qi ◽  
Haiyu Li ◽  
Dan Randles
Keyword(s):  
Low Voltage ◽  
Pv Generation

scholarly journals Method for Determining a PV Generation Limit on Low Voltage Feeders for Evenly Distributed PV and Load

2014 ◽  
Vol 57 ◽  
pp. 207-216 ◽  
Author(s):  
Simon Heslop ◽  
Iain MacGill ◽  
John Fletcher ◽  
Simon Lewis
Keyword(s):  
Low Voltage ◽  
Pv Generation

scholarly journals Voltage regulation in LV distribution networks with PV generation and battery storage

2021 ◽  
Vol 72 (6) ◽  
pp. 356-365
Author(s):  
Jordan Radosavljević
Keyword(s):  
Low Voltage ◽  
Voltage Control ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Local Load ◽  
Battery Storage ◽  
Second Stage ◽  
High Penetration ◽  
Optimal Coordination ◽  
Pv Generation

Abstract High penetration of photovoltaic (PV) generation in low voltage (LV) distribution networks can leads some power quality problems. One of the most important issues in this regard is the impermissible voltage deviation in periods with a large imbalance between PV generation and local load consumption. Accordingly, many authors deal with this issue. This work investigates voltage regulation for LV distribution networks equipped with the hybrid distribution transformer (HDT), and with high penetration of PV units. A two-stage algorithm for voltage regulation is proposed. In the first stage, a local (distributed) voltage control is performed by minimizing the injection power of the PV-battery storage system (BS)-local load entity at the common bus. In the second stage, optimal coordination is performed between the HDT and the local voltage control. In fact, the second stage is an optimal voltage regulation problem. The aim is to minimize the voltage deviations at load buses by optimal settings the voltage support of the HDT. A PSO algorithm is used to solve this optimization problem. the proposed approach is implemented in MATLAB software and evaluated on the IEEE european LV test feeder.

Design Method for DC Wiring of PV Generation System by Expansion of Low-Voltage Range

2020 ◽  
Vol 69 (7) ◽  
pp. 970-977
Author(s):  
Dong-Geun Hyun ◽  
Dong-Kyu Kim ◽  
Hyeon-Myeong Lee ◽  
Jae-Eon Kim
Keyword(s):  
Low Voltage ◽  
Design Method ◽  
Generation System ◽  
Voltage Range ◽  
Pv Generation

scholarly journals Probabilistic Methodology for Calculating PV Hosting Capacity in LV Networks Using Actual Building Roof Data

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4086 ◽  
Author(s):  
Grabner ◽  
Souvent ◽  
Suljanović ◽  
Košir ◽  
Blažič
Keyword(s):  
Distribution System ◽  
Power Plants ◽  
Low Voltage ◽  
Load Flow ◽  
Major Drawback ◽  
Building Roof ◽  
Pv Systems ◽  
External Data ◽  
Increasing Trend ◽  
Pv Generation

There has been an increasing trend of integrating photovoltaic power plants (PVs). One of the important challenges for distribution system operators is to evaluate the total installed power of a PV that a particular network can host (or PV hosting capacity) while keeping voltage and element constraints within required limits. The major drawback of the existing methods for calculating PV hosting capacity is that they use the same installed power of the PV systems for all simulated PVs, as these methods do not use external data sources about building roofs. As a consequence, this has a significant impact on the final accuracy of the results. This paper presents a probabilistic methodology for calculating the PV hosting capacity in low voltage (LV) networks. The main contribution of this paper is the improved modeling of PV generation using actual building roof data when calculating the PV hosting capacity, as every building is treated according to its actual solar potential. Monte Carlo simulations with incorporated stochastic consumption and PV generation models are utilized for load flow calculations of the actual LV network. The simulation results presented in this paper prove that the proposed methodology increases the accuracy of the final PV hosting capacity calculations.

Maximum PV generation estimation method for residential low voltage feeders

2016 ◽  
Vol 7 ◽  
pp. 58-69 ◽  
Author(s):  
Simon Heslop ◽  
Iain MacGill ◽  
John Fletcher
Keyword(s):  
Low Voltage ◽  
Estimation Method ◽  
Pv Generation

scholarly journals Comparison of Different References When Assessing PV HC in Distribution Networks

2021 ◽  
Vol 3 (1) ◽  
pp. 123-137
Author(s):  
Samar Fatima ◽  
Verner Püvi ◽  
Matti Lehtonen
Keyword(s):  
Low Voltage ◽  
Distribution Networks ◽  
Maximum Amount ◽  
Loading Conditions ◽  
Simulation Approach ◽  
Voltage Distribution ◽  
Network Loading ◽  
Mc Simulation ◽  
Pv Generation

The burgeoning photovoltaics’ (PVs) penetration in the low voltage distribution networks can cause operational bottlenecks if the PV integration exceeds the threshold known as hosting capacity (HC). There has been no common consensus on defining HC, and its numerical value varies depending on the reference used. Therefore, this article compared the HC values of three types of networks in rural, suburban, and urban regions for different HC reference definitions. The comparison was made under balanced and unbalanced PV deployment scenarios and also for two different network loading conditions. A Monte Carlo (MC) simulation approach was utilized to consider the intermittency of PV power and varying loading conditions. The stochastic analysis of the networks was implemented by carrying out a large number of simulation scenarios, which led towards the determination of the maximum amount of PV generation in each network case.

scholarly journals Low voltage ride-through strategies for a 3-phase grid-connected PV system

2021 ◽  
Author(s):  
◽  
Hao Wen
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Pv System ◽  
Low Voltage Ride Through ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Voltage Compensation ◽  
Sinusoidal Current ◽  
Power Point ◽  
Pv Generation

Grid codes is a technical specification which defines the parameters a power system that are connected to the national power systems has to ensure safe, secure and eco-nomic proper functioning of the electric system. One of these requirements is to stay connected to the grid during faults. In such scenarios, the generating unit should remain connected to the grid for a certain period and provide reactive power to support the grid. This is called low voltage ride-through capability. At the early stage, low voltage ride-through requirements were imposed for large scale generators connected to the trans-mission network. However, with the increased penetration of distributed generation, such as PV panels implemented in the distribution network, the low voltage ride-through requirements are also required for distributed generation. With the maturity of PV technology, the cost of PV generation has decreased. Therefore, the total installed capacity of grid-connected PV generation has increased; this has cre-ated new challenges to the low voltage ride-through. Power quality and transient per-formance are the most critical aspects of the grid-connected PV systems under grid faults. PV generation is permitted to switch off from the grid during a fault; however, with the high penetration of the installed PV system, it will degrade the power quality if the same method applied. It is necessary to make sure that the inverter currents remain sinusoidal and within the acceptable limits at the instant of the fault, during and after the fault clearance for different types of faults. Accordingly, this thesis proposes two low voltage ride-through strategies for a 3-phase grid-connected PV system in different reference frames. The presented low voltage ride-through control algorithm in the synchronous reference frame, which fulfils a voltage compensation unit and the reactive power injection block is designed to protect the inverter from overcurrent failure under both symmetrical and asymmetrical faults, reduce the double grid frequency oscillations and provides reac-tive power support by applying a voltage compensation unit. The inverter can also inject sinusoidal current during asymmetrical faults. The method does not require a hard switch from the Maximum Power Point Tracking to a non-Maximum Power Point Tracking algorithm, which ensures a smooth transition. The proposed method in the stationary reference frame provides a fast post-fault recov-ery, which is essential to minimize the fault impacts on the loads and the converter. The method, which consists of a new reference currents calculation block and the voltage compensation unit, maintains the converter current within acceptable limits, produces sinusoidal current even during asymmetrical faults, improves the post-fault recovery performance, and provides independent control for active and reactive powers.

scholarly journals Storage Placement and Sizing in a Distribution Grid with High PV Generation

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 303
Author(s):  
Benjamin Matthiss ◽  
Arghavan Momenifarahani ◽  
Jann Binder
Keyword(s):  
Renewable Resources ◽  
Power Flow ◽  
Low Voltage ◽  
Optimal Placement ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Reinforcement Measures ◽  
Pv Generation ◽  
Pv Penetration ◽  
Grid Reinforcement

With the increasing penetration of renewable resources into the low-voltage distribution grid, the demand for alternatives to grid reinforcement measures has risen. One possible solution is the use of battery systems to balance the power flow at crucial locations in the grid. Hereby, the optimal location and size of the system have to be determined in regard to investment and its effect on grid stability. In this paper, the optimal placement and sizing of battery storage systems for grid stabilization in a small low-voltage distribution grid in southern Germany with high PV penetration are investigated and compared to a grid heuristic reinforcement strategy.

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