Microgrid architectures for distributed generation: A brief review

Lede, Adriel M. Rizzato; Molina, Marcelo G.; Martínez, Maximiliano; Mercado, Pedro

doi:10.1109/isgt-la.2017.8126746

Cited by 35 publications

(24 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3.2. Case 5, 6,7,8,9,10 Case 5, case 6, case 7, case 8, case 9, and case 10 happen when ∆p is negative or p L is less than its critical load. The start-time of SC recharging is decided by soc SC .…”

Section: Case 1 2 3mentioning

confidence: 99%

“…Renewable energy sources such as photovoltaic (PV) sources can directly produce direct current (DC) power to supply most electric appliances, and a DC microgrid [4,5] can increase the efficiency of the power supply by decreasing the number of AC/DC converters. A hybrid microgrid can satisfy different electric appliances, but it is complex to control and to keep power balanced [6,7]. According to the system architecture, microgrid control can be divided into decentralized control and centralized control, which can reach the same goal in different ways.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DC Microgrid System Modeling and Simulation Based on a Specific Algorithm for Grid-Connected and Islanded Modes with Real-Time Demand-Side Management Optimization

2020

View full text Add to dashboard Cite

This paper presents an algorithm considering both power control and power management for a full direct current (DC) microgrid, which combines grid-connected and islanded operational modes, with real-time demand-side management optimization. The full microgrid is a hybrid dynamic system model consisting of two interacting parts: continuous-time dynamics and discrete-event dynamics. Such a full microgrid consists of photovoltaic sources, a DC load, battery storage systems, supercapacitor storage, a diesel generator, and a public grid connection, all connected on a DC common bus. This full microgrid is more reliable than a microgrid with only renewable sources or with only traditional energy sources, considering the power constraints imposed by the public grid as well as the sluggish dynamic of the diesel generator, self-discharging characteristic of the supercapacitor, and load shedding optimization. Meanwhile, this algorithm can automatically switch between grid-connected and islanded operational modes to optimize the power of the load shedding, take advantage of renewable energy, and keep the power balance in the full DC microgrid. The results under MATLAB/Simulink verify that the real-time control algorithm can maintain the power balance in real-time for the whole day and satisfy the power management strategy.

show abstract

Section: Case 1 2 3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DC Microgrid System Modeling and Simulation Based on a Specific Algorithm for Grid-Connected and Islanded Modes with Real-Time Demand-Side Management Optimization

2020

View full text Add to dashboard Cite

show abstract

“…The specific frequency area is divided as shown in Table 3. As shown in Table 3, when the frequency interval is within the range of AH or AL, the system does not need to intervene, and only needs to perform energy balance distribution to realize Equation (5). The ultimate goal is to achieve energy balance in the microgrid, that is, each the sum of the energy generated by the distributed generator is equal to the sum of the electric power of the load.…”

Section: Frequency Stability Control Strategy Of Islanded Ac Microgridmentioning

confidence: 99%

“…As an intelligent, environment friendly, and flexible distributed power generation solution, microgrid can effectively solve the contradiction between traditional large power grid and social development and improve the utilization rate of renewable energy. The isolated microgrid, which is not connected to the external large power grid, can provide high-quality power supply to areas where it cannot be covered by the large power grid, such as the marginal mountains and islands [2][3][4][5]. However, the unpredictability of load and random output of existing distributed power sources, such as wind power generation and photovoltaic power generation, will have a great impact on the power quality of microgrid [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Research on Frequency Control of Islanded Microgrid with Multiple Distributed Power Sources

Liu

Wang

Wang³

2020

Processes

View full text Add to dashboard Cite

At present, some achievements have been made in the research on the energy management of microgrid operation. However, the research is mainly on the operation of grid-connected microgrid, while the research on the energy management of islanded microgrid is still relatively few. Frequency is one of the characteristics that affects the reliability and power quality of the microgrid. The essence of controlling frequency stability is to maintain source-load balance and redistribution of active power. Therefore, this paper proposes a frequency control strategy based on dynamically cutting machine to reduce load by analyzing the use priority of different distributed power supply and the division of load importance degree, and combining the influence degree of different frequency variation range on microgrid. To coordinate and control distributed power supply, energy storage device, and load in different frequency change areas, this paper proposes different control strategies. The seed strategies of the control strategy are discussed one by one. Experimental results show that the frequency control strategy can significantly improve the frequency stability of the power supply system and reduce the operating cost of islanded microgrid.

show abstract

“…The DG units are controlled as grid following in grid-connected mode. Grid-following inverter's control strategies are described in [9,10]. However, in islanding Figure 1 illustrates the configuration of a microgrid.…”

Section: Introductionmentioning

confidence: 99%

An Improved Control Strategy for Three-Phase Power Inverters in Islanded AC Microgrids

Khan

Huawei

et al. 2018

Inventions

View full text Add to dashboard Cite

Microgrids (MGs) are composed of multiple distributed generators (DGs) interfaced to micronetwork through paralleled connected power inverters (PIs). Load sharing among multiple DG units is an important task for autonomous operation of microgrids. In order to realize satisfactory power sharing and voltage regulation between DG units, different voltage droop control strategies have been reported in the literature. In the medium voltage (MV) microgrids, power sharing, and voltage regulation often deteriorate due to dependence on nontrivial feeder impedances. The conventional control strategies are subject to steady-state active and reactive power-sharing errors along with system voltage and frequency deviations. Furthermore, complex microgrid configurations either in looped or meshed networks often make power balancing and voltage regulations more challenging. This paper presents an improved control strategy that can be extended for radial networks in order to enhance the accuracy of power sharing and voltage regulation. The proposed control strategy considers load voltage magnitude regulation as opposed the voltage regulation at inverters terminals. At the same time, a supervisory control loop is added to observe and correct system frequency deviations. This proposed method is aimed at replacing paralleled inverter control methods hitherto used. Simulation studies of the proposed scheme in comparison with the conventional control strategy in MATLAB/Simulink validate the effectiveness of the proposed strategy.Inventions 2018, 3, 47 2 of 14 mode, the distributed power inverters interfaces (DPIs) between load and microsource are governed by the droop control algorithm, which are responsible for the voltage regulation and power sharing in accordance with their ratings and corresponding energy source power. Hence, the control of paralleled connected power inverters has been investigated in recent years [11][12][13].Conventionally, the frequency and voltage magnitude droop are used as decentralized control schemes among DG units [11,12]. It can be seen as primary control of a synchronous machine. With the help of droop control active power sharing can be achieved among these DGs units. However, reactive power sharing is highly dependent on a DG unit's output filter and feeder impedances [11,[14][15][16]. The identical feeder impedance could be unequal as various DG units and load are located at different distances to each other. The unequal LCL-filter's impedance among various DGs units are due to different design considerations and system conditions [15]. In addition, configuration of microgrid network and existence of local loads often aggravate the power balancing problem. Therefore, power sharing of conventional droop control can be affected by mismatch of feeder impedances and make islanded microgrids less flexible and reliable [11,15].To solve the power control issue, a considerable number of control schemes based on droop concept have been proposed, which are classified into four main categories: (1) virtual fram...

show abstract

Microgrid architectures for distributed generation: A brief review

Cited by 35 publications

References 9 publications

DC Microgrid System Modeling and Simulation Based on a Specific Algorithm for Grid-Connected and Islanded Modes with Real-Time Demand-Side Management Optimization

DC Microgrid System Modeling and Simulation Based on a Specific Algorithm for Grid-Connected and Islanded Modes with Real-Time Demand-Side Management Optimization

Research on Frequency Control of Islanded Microgrid with Multiple Distributed Power Sources

An Improved Control Strategy for Three-Phase Power Inverters in Islanded AC Microgrids

Contact Info

Product

Resources

About