Decentralised reconfiguration of a Microgrid electrical network using reclosers

Fishov, Alexander; Ghulomzoda, Anvari; Kasobov, Loik

doi:10.21285/1814-3520-2020-2-382-395

Cited by 5 publications

(3 citation statements)

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“…An emergency-free breakdown of the active grid into parts is advisable, provided that the parts are sufficiently balanced, which corresponds to the transition to using existing generation to reserve power supply and maintain the operation of power plants. Such disintegration is also provided by appropriate decentralized management [28][29][30], and the subsequent restoration of network integrity and normal operation is associated with solving the problem of synchronization of divided parts [31][32][33][34].…”

Section: Managing Emergency-balanced Network Breakdownmentioning

confidence: 99%

Decentralized Emergency Control of AC Power Grid Modes with Distributed Generation

et al. 2023

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Large-scale development of small-scale generation, and facilities based on this, with their integration into existing distribution networks, qualitatively change the modes and tasks of network management and transform previously passive electric networks into active ones. Features of parameters and modes of small-scale generation, insufficient observability and manageability in centralized management determine the need to use a decentralized multi-agent control of the modes of such networks. First of all, this applies to emergency management, which includes automatic restoration of the integrity and normal operation of the network. This paper presents a set of specialized methods for emergency management of active power grid modes and the results of a study of their effectiveness on mathematical and physical models that confirm the feasibility of using decentralized emergency management and network recovery management. In particular, this includes: a method of emergency proactively balanced separation of grid energy districts along one of the a priori fixed network cross-sections in the event of disturbances with the transition to island mode, and a method for two-stage restoration of the integrity and normal network mode with decentralized synchronization of active parts on remote network switches. In the case of the decentralized remote synchronization of active parts, it is proposed to use special control of the excitation and speed of generators to create conditions for the successful operation of automatic reclosing devices with synchronization detection. It is essential for emergency management in active networks with small generation to reject the concept of ensuring the reliability of power supply through maintaining the integrity of the network in favor of the concept of an emergency-balanced breakdown of the network into balanced areas with the subsequent automatic restoration of integrity. To conduct research on the physical model, a prototype of distributed system emergency automation has been developed that does not use data transmission tools, which ensures its high cybersecurity and the feasibility of decentralized management.

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Section: Managing Emergency-balanced Network Breakdownmentioning

confidence: 99%

Decentralized Emergency Control of AC Power Grid Modes with Distributed Generation

et al. 2023

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“…Today, reclosers are widely used as a unifying element of network parts with the sources [39]. Reclosers are elements that perform the separation functions, reserving parts of 6-10 kV electrical networks with long power lines of a trunk-radial configuration.…”

Section: Combined Use Of Both the Special Automation And Intelligent ...mentioning

confidence: 99%

A Novel Approach of Synchronization of Microgrid with a Power System of Limited Capacity

et al. 2021

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Currently, active networks called microgrids are formed on the basis of local power supply systems with a small share of distributed generation. Microgrids operating in an island mode, in some cases, have the ability to transfer electricity excess to an external network leading to a synchronization requirement; thus, the optimization task in terms of the system’s synchronization must be considered. This paper proposes a method for obtaining synchronization between microgrids and power systems of limited capacity based on a passive synchronization algorithm, allowing us to connect a microgrid to an external power system with a minimum impact moment on the shaft of the generating equipment. The algorithm application was demonstrated by considering a real-life object in Tajikistan. The simulation was carried out on RastrWin3. The obtained results show that the microgrid generator is connected to an external power system at an angle of 0.3° and a power surge of 29 kW, unlike the classical synchronization algorithm with an angle of 6.8° and a power surge of 154 kW (a reduction of the shock moment by more than five times). The proposed synchronization method allows us to reduce the resource consumption of the generating equipment and increase the reliability and efficiency of the functioning units of the examined power system.

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“…Another key element of decentralized operation and control of Microgrids is an automatic recloser. Fishov et al [40] considered a decentralized reconfiguration of the electrical network with a microgrid using advanced reclosers. Reclosers perform the functions of isolation and redundancy in 6-10 kV distribution grids of radial and network types with long transmission lines.…”

Section: Combined Use Of Emergency Control and Reclosersmentioning

confidence: 99%

Recloser-Based Decentralized Control of the Grid with Distributed Generation in the Lahsh District of the Rasht Grid in Tajikistan, Central Asia

et al. 2020

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Small-scale power generation based on renewable energy sources is gaining popularity in distribution grids, creating new challenges for power system control. At the same time, remote consumers with their own small-scale generation still have low reliability of power supply and poor power quality, due to the lack of proper technology for grid control when the main power supply is lost. Today, there is a global trend in the transition from a power supply with centralized control to a decentralized one, which has led to the Microgrid concept. A microgrid is an intelligent automated system that can reconfigure by itself, maintain the power balance, and distribute power flows. The main purpose of this paper is to study the method of control using reclosers in the Lahsh district of the Rasht grid in Tajikistan with distributed small generation. Based on modified reclosers, a method of decentralized synchronization and restoration of the grid normal operation after the loss of the main power source was proposed. In order to assess the stable operation of small hydropower plants under disturbances, the transients caused by proactive automatic islanding (PAI) and restoration of the interconnection between the microgrid and the main grid are shown. Rustab software, as one of the multifunctional software applications in the field of power systems transients study, was used for simulation purposes. Based on the simulation results, it can be concluded that under disturbances, the proposed method had a positive effect on the stability of small hydropower plants, which are owned and dispatched by the Rasht grid. Moreover, the proposed method sufficiently ensures the quality of the supplied power and improves the reliability of power supply in the Lahsh district of Tajikistan.

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Decentralised reconfiguration of a Microgrid electrical network using reclosers

Cited by 5 publications

References 0 publications

Decentralized Emergency Control of AC Power Grid Modes with Distributed Generation

Decentralized Emergency Control of AC Power Grid Modes with Distributed Generation

A Novel Approach of Synchronization of Microgrid with a Power System of Limited Capacity

Recloser-Based Decentralized Control of the Grid with Distributed Generation in the Lahsh District of the Rasht Grid in Tajikistan, Central Asia

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