Impacts and interactions of voltage regulators on distribution networks with high PV penetration

Hariri, Ali; Faruque, M. Omar; Soman, Ruturaj; Meeker, Rick

doi:10.1109/naps.2015.7335212

Cited by 13 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So, the upper branch current I B1 and lower branch current I B2 are derived as ( 5) and ( 6), respectively. The load current is the sum of I B1 and I B2 , as shown in (7). The injected voltage from the regulation transformer, V reg , regulates the load voltage to the nominal value as ( 8)…”

Section: Circuit Analysis and Controlmentioning

confidence: 99%

See 1 more Smart Citation

A High-Efficiency Low-Wearing Hybrid Voltage Regulator for Utility Applications

Wang

Zhao

2023

IEEE Open J. Ind. Applicat.

View full text Add to dashboard Cite

Step voltage regulator (SVR) has been utilized in power distribution systems for decades as the voltage regulation device. Due to the increasing integration of distributed energy resources, the conventional SVR is severely challenged by the modern power distribution pattern with high renewable energy penetration. The induced arc from the conventional SVR tap change and more frequent tap changes due to voltage instability from the renewable energy impose constraints on the conventional SVRs lifetime. Meanwhile, the conventional SVR device cannot regulate the voltage accurately since the SVR regulates the voltage step-bystep. This article proposed a hybrid voltage regulator with high-efficiency and low contact wearing, which can achieve arcless tap change and stepless voltage regulation by using a fractionally rated back-to-back power converter. The accurate load voltage regulation is guaranteed, while the tap changer mechanism remains in the system, which helps to promote the upgrade to the existing power distribution systems. The power converter capacity in the proposed topology is only 0.31% of the distribution transformer rating to achieve a stepless voltage regulation range of ±10%, significantly reducing the system cost compared with the full power electronics solutions and projects high total system efficiency. The proposed hybrid voltage regulator was simulated and experimentally validated. The experimental results demonstrate arcless tap change operation and stepless voltage regulation. Collaborative operation between the conventional mechanical tap change and the power converter operation is also demonstrated to acquire large voltage regulation with fast-acting voltage control.

show abstract

Section: Circuit Analysis and Controlmentioning

confidence: 99%

“…The pattern of modern power generation and renewable energy penetration requires more frequent tap change operations for the conventional SVRs, which imposes a further constraint on the SVRs lifetime [6], [7]. To extend the lifetime of the conventional SVRs, multiple studies have proposed different solutions to achieve arcless tap change.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency Low-Wearing Hybrid Voltage Regulator for Utility Applications

Wang

Zhao

2023

IEEE Open J. Ind. Applicat.

View full text Add to dashboard Cite

show abstract

“…The study showed that there was no problem with voltage regulation but with a tendency to cause increased number of operations of the transformer tap changer. Also, Hariri et al [68] used Quasi-Static Time Series (QSTS) simulation to show that when the PV inverter system is allowed to participate in voltage regulation, the voltage regulator operations might increase and therefore, makes updating the traditional system controls a pivotal requirement. The study used a synthesized one minute resolution irradiance data for simulation and analysis.…”

Section: Impact On Voltage Regulation Devicesmentioning

confidence: 99%

Interconnection Impact Analysis of Solar Photovoltaic Systems with Distribution Networks

Emmanuel¹

View full text Add to dashboard Cite

<p>As the solar PV technology continues to evolve as the most common distributed generation (DG) coupled with increasing interconnection requests, accurate modelling of the potential operational impacts of this game-changer is pivotal in order to maintain the reliability of the electric grid. The overall goal of this research is to conduct an interconnection impact analysis of solar PV systems at increasing penetration levels subject to the feeder constraints within the distribution network. This is carried out with a time series power flow analysis method to capture the time-varying nature of solar PV and load with their interactions with the distribution network device operations. Also, this thesis analyses multiple PV systems scenarios and a wide range of possible impacts to enable distribution system planners and operators understand and characterize grid operations with the integration of PV systems. An evaluation of the operational and reliability performance of a grid-connected PV system based on IEC standards and industry guides is performed to detect design failures and avoid unnecessary delays to PV penetration. The performance analysis metrics in this research allow cross-comparison between PV systems operating under different climatic conditions. This thesis shows the significant impact of temperature on the overall performance of the PV system. This research conducts an interconnection study for spatially distributed single-phase grid-tied PV systems with a five minute-resolution load and solar irradiance data on a typical distribution feeder. Also, this research compares the performance of generator models, PQ and P |V |, for connecting PV-DG with the distribution feeder with their respective computational costs for a converged power flow solution. More so, a method capable of computing the incremental capacity additions, measuring risks and upgrade deferral provided by PV systems deployments is investigated in this research. This thesis proposes surrogate metrics, energy exceeding normal rating and unserved energy, for evaluating system reliability and capacity usage which can be a very useful visualization tool for utilities. Also, sensitivity analysis is performed for optimal location of the PV system on the distribution network. This is important because optimal integration of PV systems is often near-optimal for network capacity relief issues as well. This thesis models the impact of centralized PV variability on the electric grid using the wavelet variability model (WVM) which considers the key factors that affect PV variability such as PV footprint, density and cloud movement over the entire PV plant. The upscaling advantage from a single module and point irradiance sensor to geographic smoothing over the entire PV footprint in WVM is used to simulate effects of a utility-interactive PV system on the distribution feeder. Further, the PV interconnection scenarios presented in this thesis have been modelled with different time scales ranging from seconds to hours in order to accurately capture and represent various impacts. The analysis and advancements presented in this thesis will help utilities and other stakeholders to develop realistic projections of PV systems impacts on the grid. Also, this research will assist in understanding and full characterization of PV integration with the grid to avoid unnecessary delays.</p>

show abstract