scholarly journals MAS-Based Decentralized Coordinated Control Strategy in a Micro-Grid with Multiple Microsources

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2141
Author(s):  
Shiyun Xu ◽  
Huadong Sun ◽  
Zhanqiang Zhang ◽  
Qiang Guo ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Voltage Stability ◽  
Control Method ◽  
Energy Resource ◽  
Coordinated Control ◽  
Power Sharing ◽  
Distributed Energy ◽  
Current Controller ◽  
Circulation Current ◽  
Micro Grid ◽  
Upper Level

In this paper, a decentralized coordinated control method based on multi-agent system is proposed to improve the voltage stability of micro-grid. In lower-level agents, the decentralized control is designed as double-loop controllers for the inverter of each distributed energy resource, including an outer-loop power controller based on droop control and an inner-loop voltage/current controller based on fractional order proportion-integral-derivative (PID). In upper-level agents, the distributed coordinated control is designed to make voltage consensus and proportional power sharing of all distributed energy resources. Since each distributed coordinated control only requires its own and neighboring information, the communication bandwidth can be saved. The simulation results have verified the effectiveness in terms of power sharing, voltage stability, and suppressing circulation current.

scholarly journals Model-Free Dynamic Voltage Control of Distributed Energy Resource (DER)-Based Microgrids

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3838
Author(s):  
Kenan Hatipoglu ◽  
Mohammed Olama ◽  
Yaosuo Xue
Keyword(s):  
Voltage Stability ◽  
Reactive Power ◽  
Energy Resource ◽  
Control Technique ◽  
Computational Time ◽  
Voltage Stabilizer ◽  
Distributed Energy ◽  
Model Free ◽  
Dynamic Voltage ◽  
Dynamic Voltage Stability

In this paper, we present a new control technique for sustaining dynamic voltage stability by effective reactive power control and coordination of distributed energy resources (DERs) in microgrids. The proposed control technique is based on model-free control (MFC), which has shown successful operation and improved performance in different domains and applications. This paper presents its first use in the voltage stability of a microgrid setting employing multiple synchronous generator (SG)-based and power electronic (PE)-based DERs. MFC is a computationally efficient, data-driven control technique that does not require modelling of the different components and disturbances in the power system. It is utilized as an online controller to achieve the dynamic voltage stability of a microgrid system under different disturbances and fault conditions. A 21-bus microgrid system fed by multiple DERs is considered as a case study and the overall dynamic voltage stability is investigated using time-domain dynamic simulations. Numerical results show that the proposed MFC provides improvements on the dynamic load bus voltage profiles and requires less computational time as compared to the traditional enhanced microgrid voltage stabilizer (EMGVS) scheme. Due to its simplicity and low computational requirement, MFC can be easily implemented in resource-constrained computing devices such as smart inverters.

Analysis and Modeling of Droop Control in Micro-Source for Islanded Micro-Grid

2014 ◽  
Vol 960-961 ◽  
pp. 1151-1155 ◽  
Author(s):  
Wei Lin Zhang ◽  
Jing Xiong ◽  
Yu Jiong Gu ◽  
Ping Zhu
Keyword(s):  
Distributed Generation ◽  
Control Method ◽  
Controller Design ◽  
Power Sharing ◽  
Droop Control ◽  
Simulation Data ◽  
Storage Devices ◽  
Load Power ◽  
Micro Grid ◽  
System Frequency

Considering decentralization of the micro-source units and loads in the micro-grid and concentrating on generation types and models of the storage devices,droop controlstrategy is used in controller design for the distributed generation units. The generation units adopting droop control method based on the droop characteristics can facilitate load power sharing when the powers of loads vary, and can also maintain the system frequency when a unit fault occurs and the micro-grid islands. Then, the operation variations of the micro-grid are analyzed when it runs with load changes in islanding mode and runs with the load power of micro-source varied suddenly. The corresponding rules of the active power, voltage and current for each micro-source and the frequency for the micro-grid are obtained. The simulation data results show the correctness and validity of the droop control strategy.

scholarly journals Maximizing Distributed Energy Resource Hosting Capacity of Power System in South Korea Using Integrated Feeder, Distribution, and Transmission System

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3367
Author(s):  
Victor Widiputra ◽  
Junhyuk Kong ◽  
Yejin Yang ◽  
Jaesung Jung ◽  
Robert Broadwater
Keyword(s):  
South Korea ◽  
Power System ◽  
Distribution System ◽  
Voltage Stability ◽  
Energy Resource ◽  
Test System ◽  
Transmission System ◽  
System Level ◽  
Distributed Energy ◽  
Distributed Energy Resource

Intermittent power generated from renewable distributed energy resource (DER) can create voltage stability problems in the system during peak power production in the low demand period. Thus, the existing standard for operation and management of the distribution system limits the penetration level of the DER and the amount of load in a power system. In this standard, the hosting capacity of the DER is limited to each feeder at a level where the voltage problem does not occur. South Korea applied this standard, thereby making it hard to achieve its DER target. However, by analyzing the voltage stability of an integrated system, the hosting capacity of DER can be increased. Therefore, in this study, the maximum hosting capacity of DER is determined by analyzing an integrated transmission and distribution system. Moreover, the fast voltage stability index (FVSI) is used to verify the determined hosting capacity of DER. For this, the existing interconnection standard of DER at a feeder, distribution system, and transmission system level is investigated. Subsequently, a Monte Carlo simulation is performed to determine the maximum penetration of the DER at a feeder level, while varying the load according to the standard test system in South Korea. The actual load generation profile is used to simulate system conditions in order to determine the maximum DER hosting capacity.

A comparative analysis of the performance of centralized inverter and parallel inverter based hybrid microgrid system for distributed generation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sudheer Peddeeti ◽  
Sandeep Vuddanti
Keyword(s):  
Comparative Analysis ◽  
Power Quality ◽  
Hybrid System ◽  
Power Sharing ◽  
Distributed Energy ◽  
Hybrid Microgrid ◽  
Power Exchange ◽  
Current Controller ◽  
Frequency Drop ◽  
Parallel Inverter

Abstract In this paper, the performance and reliability of the hybrid microgrid system is analyzed with the two different configurations where multiple distributed energy sources supplied the power to the loads through centralized inverter and parallel inverter. The power quality, power sharing, power exchange and voltage and frequency drop parameters are evaluated by applying 1.1 kVA load on the centralized and parallel inverter hybrid systems with LL and LLG faults. The hysteresis current controller in the centralized inverter hybrid system is assuring the accurate power exchange between the grid and hybrid system during abnormal conditions. The droop controller in parallel inverter hybrid system is effectively sharing the load among the inverters during normal and abnormal conditions. The comparative analysis of these energy systems is made based on control aspects, power quality, reliability and economics.

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