System Unbalance Analyses and Improvement for Rooftop Photovoltaic Generation Systems in Distribution Networks

Leou, Rong‐Ceng; Teng, Jen‐Hao; Li, Yunfang; Lin, Wei‐Chieh; Lin, Yu-Hung

doi:10.3390/en13081996

Cited by 3 publications

(5 citation statements)

References 20 publications

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“…To determine the size of both types of DGs in SIDG optimization (DGT = 0), n T is equal to two (one gen for IDG and one gen for SDG size), and in SDG or IDG optimization is equal to one (DGT = 1 or 2). So,n SDG i and n IDG i are derived from the value of each gen to replace in (9). Zero values indicate that no DG is installed on the related bus.…”

Section: Optimization Methodsmentioning

confidence: 99%

“…In [8], load and irradiance uncertainty are considered in photovoltaic (PV) system penetration in an unbalanced distribution system. Probable unbalances caused by rooftop PVs in distribution systems are considered in [9]. In [10], hosting capacity and harmonic distortion limits are considered for the integration of large‐scale PV plants in non‐sinusoidal environments.…”

Section: Introductionmentioning

confidence: 99%

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Optimal distributed generation penetration considering relay coordination and power quality requirements

Sadeghi

Dastfan

Damchi

2022

IET Generation Trans & Dist

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Although the electric energy supply from distributed generation (DG) resources is increasing, these sources also face limitations. Protection and power quality constraints are the most important issues that limit the maximum DG penetration in power systems.Changing the short circuit level due to DGs' presence-especially synchronous-based (SDG) type-may lead to miscoordination of the protective relays. Also, standard harmonic limits may be violated due to harmonic injection of inverter-based DGs and non-linear loads. A protection coordination problem is solved for the basic configuration, and the optimal settings are applied. Then, using a proposed approach and a new objective function, the location, size, and type of DGs are optimized to maximize the DG penetration and the speed of protection system, while reducing power losses. Finally, the protection setting of SDGs is optimized and applied. In these optimizations, the protection coordination constraints and the power quality requirements are considered and met. IEEE 14-bus system and a real sub-transmission system are simulated to evaluate the proposed approach and the new objective function. The obtained results show significant power loss reduction and protection speed improvement for different scenarios and case studies.

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Section: Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal distributed generation penetration considering relay coordination and power quality requirements

Sadeghi

Dastfan

Damchi

2022

IET Generation Trans & Dist

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“…Voltage unbalance is defined as the ratio of the negative sequence voltage to the positive sequence voltage [46]. An ideal power system should have a balanced set of three phase voltages.…”

Section: Voltage Unbalancementioning

confidence: 99%

“…An approach to use single-phase inverters distributed in a delta formation among different phases of a network have been used to improve voltage unbalance in the three-phase four-wire systems in [99], a consensus-based distributed algorithm was used to coordinate the distributed inverters. A genetic algorithm to perform phase swapping to achieve an optimal transformer phase arrangement to minimise voltage unbalance is proposed in [46].…”

Section: Voltage Unbalancementioning

confidence: 99%

Impact of intermittent renewable energy generation penetration on the power system networks – A review

Mlilo

Brown

Ahfock

2021

Technol Econ Smart Grids Sustain Energy

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Entrance of intermittent renewable power energy sources has brought in benefits mainly associated with emission reduction to help the climate change cause and reduce pollution. However, entrance of renewable generation sources, mainly wind and solar generation that are intermittent energy sources by nature has not come without its own challenges. Future power grids will see continued elevation of intermittent generation with instantaneous penetration levels that may potentially be as high as 100% for some periods. This paper reviews published works and highlights technical challenges that require further research to ensure that power grids that will be dominated by inverter-based generation or purely powered by inverter-based generation continue to operate reliably and remain stable for all operating scenarios. The paper outlines further research opportunities in areas of power sytem security assessment, voltage and frequency management, power system stability, resource forecasting techniques for unit commitment, behind the meter generators and loads integration to grid, frequency and voltage support, power system flexibility assessment methods, protection schemes enhancement, power quality mitigation techniques and modelling requirements to support real-time power system operation.

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“…However, in the design and planning stage, it is generally difficult to determine the type and transposition method of the ground wire, so it is difficult to evaluate it. In contrast, the parameters of the wire are relatively easy to determine [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

Li¹,

Huang²,

Tan³

et al. 2023

Energy Engineering

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The analysis of the loss of distributed photovoltaic power generation systems involves the interests of energy users, energy-saving service companies, and power grid companies, so it has always been the focus of the industry and society in some manner or another. However, the related analysis for an actual case that considers different cooperative corporations' benefits is lacking in the presently available literature. This paper takes the distributed rooftop photovoltaic power generation project in an industrial park as the object, studies the analysis and calculation methods of line loss and transformer loss, analyzes the change of transformer loss under different temperatures and different load rates, and compares the data and trend of electricity consumption and power generation in industrial parks before and after the photovoltaic operation. This paper explores and practices the analysis method of the operating loss of distributed photovoltaic power generation and provides an essential reference for the benefit analysis and investment cost estimation of distributed photovoltaic power generation systems in industrial parks. The analyzed results reveal that the change loss is stable after the photovoltaic is connected, and there is no additional transformer loss. And before and after the photovoltaic system installation, there was no significant change in the total monthly data difference between the total meter and the sub-meter.

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System Unbalance Analyses and Improvement for Rooftop Photovoltaic Generation Systems in Distribution Networks

Cited by 3 publications

References 20 publications

Optimal distributed generation penetration considering relay coordination and power quality requirements

Optimal distributed generation penetration considering relay coordination and power quality requirements

Impact of intermittent renewable energy generation penetration on the power system networks – A review

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

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