A novel indicator for evaluation of the impact of distributed generations on the energy losses of low voltage distribution grids

Ma, Chenjie; Dasenbrock, Johannes; Töbermann, J.-Christian; Braun, Martin

doi:10.1016/j.apenergy.2019.03.090

Cited by 32 publications

(12 citation statements)

References 25 publications

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“…In [8][9][10][11][12][13], the authors consider the main advantages, system-wide effects, and issues related to the connection of distributed energy sources to distribution networks. Studies [14][15][16] cover the operation of power grids with DG, including power system protection, hourly load, and electric power quality of distributed generation devices [17][18][19][20]. In [21][22][23], the authors investigate the security of electric power systems with distributed generation in terms of cascading failures and present the models for determining the limit operating conditions in power grids and methods for assessing the operating parameters of energy service areas with distributed generation facilities.…”

Section: Literature Reviewmentioning

confidence: 99%

A Methodological Approach to Assessing the Possible Effect of Distributed Generation Expansion on Regional Energy Supply Systems

Galperova

2021

Energy Systems Research

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One of the new challenges arising from the transition of the energy industry to the path of intelligent development is to assess the effect of distributed generation (DG) on the prospects for the development of regional energy supply systems. Such an assessment requires that the factors characterized by high uncertainty be taken into account. In this case, it is expedient to employ a combination of the optimization method with the Monte Carlo method. Such an approach has already been adopted in a model (computer program) developed at the Melentiev Energy Systems Institute, Siberian Branch of the Russian Academy of Sciences. This model is designed to determine the rational mix of new power plants (with investment risks assessed and factored in) and the likely cost of electricity generation in a given aggregated region. We propose using this model as a source of projected data for an approximate assessment of the DG expansion, given the projected conditions for the energy sector and electric power industry development. It may also provide the basis for an array of research tools for relevant studies. The new toolkit requires a more detailed representation of the administrative division and the inclusion of consumers with their sources of electric power generation in the generating capacity. Although such an estimate is approximate, it can give an overall idea of the extent to which the cost and demand for electricity may vary under different options for the DG expansion in a region.

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Section: Literature Reviewmentioning

confidence: 99%

A Methodological Approach to Assessing the Possible Effect of Distributed Generation Expansion on Regional Energy Supply Systems

Galperova

2021

Energy Systems Research

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“…Similarly, using the real part of (7), the variation of the transformer end voltage with respect to the PV active power can be obtained.…”

Section: Voltage Sensitivity Derivation At the Transformer Endmentioning

confidence: 99%

“…However, since the conventional LVDG was designed based on the assumption that power flow would be from the primary substation to the loads [5], high PV penetration gives rise to unforeseen problems [6]. The high penetration of rooftop PV in LVDGs can result in reverse power flows [7] and an increase in the neutral current, leading to distribution and transformer losses due to overheating of the conductor [5,[8][9][10][11]. A major problem of reverse power flow is the occurrence of upper limit voltage violations, where the node voltage at specific points of LVDGs is greater than the specified limit [12].…”

Section: Introductionmentioning

confidence: 99%

A Sensitivity Matrix Approach Using Two-Stage Optimization for Voltage Regulation of LV Networks with High PV Penetration

et al. 2021

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The occurrence of voltage violations is a major deterrent for absorbing more rooftop solar power into smart Low-Voltage Distribution Grids (LVDGs). Recent studies have focused on decentralized control methods to solve this problem due to the high computational time in performing load flows in centralized control techniques. To address this issue, a novel sensitivity matrix was developed to estimate the voltages of the network by replacing load flow simulations. In this paper, a Centralized Active, Reactive Power Management System (CARPMS) is proposed to optimally utilize the reactive power capability of smart Photovoltaic (PV) inverters with minimal active power curtailment to mitigate the voltage violation problem. The developed sensitivity matrix is able to reduce the time consumed by 55.1% compared to load flow simulations, enabling near-real-time control optimization. Given the large solution space of power systems, a novel two-stage optimization is proposed, where the solution space is narrowed down by a Feasible Region Search (FRS) step, followed by Particle Swarm Optimization (PSO). The failure of standalone PSO to converge to a feasible solution for 34% of the scenarios evaluated further validates the necessity of the two-stage optimization using FRS. The performance of the proposed methodology was analysed in comparison to the load flow method to demonstrate the accuracy and the capability of the optimization algorithm to mitigate voltage violations in near-real time. The deviations of the mean voltages of the proposed methodology from the load flow method were: 6.5×10−3 p.u for reactive power control using Q-injection, 1.02×10−2 p.u for reactive power control using Q-absorption, and 0 p.u for active power curtailment case.

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“…With the acceleration in the construction of the 5G infrastructure and the rapid development of the intelligent manufacturing industry (Giampieri et al, 2020), the quality requirements of the power of the distribution network are becoming increasingly stringent. Furthermore, the urban power grid is struggling to maintain pace with the rapid development of electric vehicles (Cha et al, 2020) and distributed generation (DG) (Ma et al, 2019), and problems such as unreasonable power grid structure are more becoming prominent (Abu-Elzait and Parkin, 2019). With the continuous economic growth, the demand for power continues to grow rapidly.…”

Section: Introductionmentioning

confidence: 99%

Research on the Application of SOP in Multi-Station Integrated System

et al. 2021

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The current large-scale access to distributed power and the rapid growth of electric vehicles are seriously affecting the reliability of distribution networks. The new multi-station fusion technology based on the flexible interconnection of the distribution network can effectively solve this problem. In this study, we design a multi-purpose station and a multi-function device using a soft normally open point (SOP). A new multi-station integration topology and a coordinated control strategy are developed using an active power signal (APS) and an energy management system (EMS). The coordinated control strategy involves sending out the corresponding operation mode command after the EMS receives the superior instruction or the APS of the local system and coordinating the operation mode of the SOP, energy storage DC/DC converter, and photovoltaic DC/DC converter, thereby ensuring stable and efficient operation of the multi-station fusion system. Finally, two typical cases are simulated to verify the feasibility and effectiveness of the proposed topology and control strategy.

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A novel indicator for evaluation of the impact of distributed generations on the energy losses of low voltage distribution grids

Cited by 32 publications

References 25 publications

A Methodological Approach to Assessing the Possible Effect of Distributed Generation Expansion on Regional Energy Supply Systems

A Methodological Approach to Assessing the Possible Effect of Distributed Generation Expansion on Regional Energy Supply Systems

A Sensitivity Matrix Approach Using Two-Stage Optimization for Voltage Regulation of LV Networks with High PV Penetration

Research on the Application of SOP in Multi-Station Integrated System

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