A distributed control strategy of microgrid based on multi-agent consensus algorithm

2020 ◽  
Vol 20 (3) ◽  
pp. 785-806
Author(s):  
Yuting Tao ◽  
Ning Lu
Keyword(s):  
Distributed Control ◽  
Control Strategy ◽  
Consensus Algorithm ◽  
Droop Control ◽  
Good Convergence ◽  
Distributed Generators ◽  
Simulink Simulation ◽  
Multi Agent ◽  
Integral Controller ◽  
Virtual Leader

In an islanded microgrid with distributed generators (DGs), on account of the influence of feeder impedance, load and other factors, it is difficult to dispatch output power reasonably by means of droop control, therefore the secondary control is employed to solve this problem. However, the convention methods may fail to achieve the expected effect. In this context, an improved distributed control strategy based on multi-agent consensus algorithm is proposed in this paper. A virtual leader is set to track the balance of power. Through the mutual communication between DGs, it can realize the flexible distribution of load power and has good convergence. By introducing the integral controller on the basis of conventional droop control, the droop curve can move adaptively to maintain frequency and voltage stable. Finally, the effectiveness of the proposed scheme and the performance of anti-communication failure are verified in MATLAB/Simulink simulation platform.

Control of inverters in standalone andgrid-connected microgrid using different control strategies

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Vikash Gurugubelli ◽  
Arnab Ghosh
Keyword(s):  
Transient Response ◽  
Control Strategy ◽  
Control Strategies ◽  
Power Balance ◽  
Droop Control ◽  
Content Type ◽  
Simulink Simulation ◽  
Time Simulation ◽  
Simulation Results ◽  
First Time

Purpose The share of renewable energy sources (RESs) in the power system is increasing day by day. The RESs are intermittent, therefore maintaining the grid stability and power balance is very difficult. The purpose of this paper is to control the inverters in microgrid using different control strategies to maintain the system stability and power balance. Design/methodology/approach In this paper, different control strategies are implemented to the voltage source converter (VSC) to get the desired performance. The DQ control is a basic control strategy that is inherently present in the droop and virtual synchronous machine (VSM) control strategies. The droop and VSM control strategies are inspired by the conventional synchronous machine (SM). The main objective of this work is to design and implement the three aforementioned control strategies in microgrid. Findings The significant contributions of this work are: the detailed implementation of DQ control, droop control and VSM control strategies for VSC in both grid-connected mode and standalone mode is presented; the MATLAB/Simulink simulation results and comparative studies of the three aforementioned controllers are introduced first time in the proposed work; and the opal-RT digital real-time simulation results of the proposed VSM control show the superiority in transient response compared to the droop control strategy. Research limitations/implications In the power system, the power electronic-based power allowed by VSM is dominated by the conventional power which is generated from the traditional SM, and then the issues related to stability still need advance study. There are some differences between the SM and VSM characteristics, so the integration of VSM with the existing system still needs further study. Economical operation of VSM with hybrid storage is also one of the future scopes of this work. Originality/value The significant contributions of this work are: the detailed implementation of DQ control, droop control and VSM control strategies for VSC in both grid-connected mode and standalone mode is presented; the MATLAB/Simulink simulation results and comparative studies of the three aforementioned controllers are introduced first time in the proposed work; and the opal-RT digital real-time simulation results of the proposed VSM control show the superiority in transient response compared to the droop control strategy.

scholarly journals Hierarchical Distributed Control Strategy for Electric Vehicle Mobile Energy Storage Clusters

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1195 ◽  
Author(s):  
Mei Wu ◽  
Yu-Qing Bao ◽  
Gang Chen ◽  
Jinlong Zhang ◽  
Beibei Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power System ◽  
Distributed Control ◽  
Control Strategy ◽  
Optimal Allocation ◽  
Lower Layer ◽  
Power Grid ◽  
Consensus Algorithm ◽  
Renewable Energy Resources ◽  
Storage Unit

The stability problem of the power system becomes increasingly important for the penetration of renewable energy resources (RESs). The inclusion of electric vehicles (EVs) in a power system can not only promote the consumption of RESs, but also provide energy for the power grid if necessary. As a mobile energy storage unit (MESU), EVs should pay more attention to the service life of their batteries during operation. A hierarchical distributed control strategy was proposed in this paper for mobile energy storage clusters (MESCs) considering the life loss of each EV’s battery. This strategy was divided into a two-layer control structure. Firstly, numerous EVs were divided into different clusters according to their regional relationships. The lower layer adopted a distributed collaborative control approach for allocating energy among EVs in the cluster. Under this condition, an aggregate EVs response model was established and the characteristic of the MESC was analyzed. Secondly, the upper layer applied the multi-agent consensus algorithm to achieve the optimal allocation among different clusters. Therefore, the control strategy realized the two-way communication of energy between EVs and the power grid, and ensured the optimal economical dispatch for the mobile energy storage system (MESS). Finally, the simulation of testing examples verified the effectiveness of the proposed strategy.

scholarly journals Distributed Control Strategy for Smart Home Appliances Considering the Discrete Response Characteristics of the On/Off Loads

2019 ◽  
Vol 9 (3) ◽  
pp. 457 ◽  
Author(s):  
De-Yin Kong ◽  
Yu-Qing Bao ◽  
Ying-Yi Hong ◽  
Bei-Bei Wang ◽  
Hong-Bin Huang ◽  
...  
Keyword(s):  
Distributed Control ◽  
Control Strategy ◽  
Smart Home ◽  
Control Method ◽  
Consensus Algorithm ◽  
Centralized Control ◽  
Response Characteristics ◽  
Fitting Method ◽  
Discrete Response ◽  
Smart Home Appliances

With the development of smart home technology, more and more electrical appliances can participate in demand response, providing support for active power balance of the power grid. However, the conventional centralized control method faces vast amounts of electrical appliances, resulting in problems such as communication congestion and dimension curse. This paper proposes a distributed control strategy for electrical appliances based on a multi-agent consensus algorithm. Considering the discrete response characteristics of the on/off loads, a priority ranking mechanism is established, and the customer cost function is established by a fitting method. Based on the incremental cost consensus (ICC) algorithm, the optimal power allocation of customers is realized through distributed control. Simulation and analysis of the examples verify the effectiveness of the proposed strategy.

A Control Strategy with Series-Parallel Inverter for Micro-Grid Operation

2014 ◽  
Vol 1044-1045 ◽  
pp. 677-680
Author(s):  
Gui Ying Liu ◽  
Yong Guang Gui ◽  
Shi Ping Su ◽  
Qian Luo ◽  
Jiang Wu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Operation Mode ◽  
Droop Control ◽  
Three Phase ◽  
Islanding Operation ◽  
Integral Controller ◽  
Micro Grid ◽  
Grid Operation ◽  
Parallel Inverter

For the different operation mode of micro-grid, an improved droop control method and a parallel inverter was proposed depending on the study of micro-grid inverter. Grid-connected interface contains a series inverter and a parallel inverter, and can be switched to select different work mode. The parallel inverter can eliminate harmonic, compensate three-phase imbalanced current to improve the quality of the power delivered to the utility grid. In islanding operation mode, the improved droop control strategy was applied, where an integral controller was introduced. So it can reduce the inverter output voltage amplitude. Thereby it can restrain circulation and realize the power of self-distribution. The effectiveness and feasibility are verified by the simulation result.

scholarly journals Adaptive Droop Control of a Multibus DC Microgrid Based on Consensus Algorithm

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mingche Li ◽  
Jiangwei Fan ◽  
Lihui Qiao
Keyword(s):  
Control Strategy ◽  
Multiagent System ◽  
Consensus Algorithm ◽  
Power Balance ◽  
Droop Control ◽  
Regional Power ◽  
Consensus Protocol ◽  
Dc Microgrid ◽  
Control Objective ◽  
Bus Voltage

The main control objective of a DC microgrid with a multibus structure is to stabilize the bus voltage and maintain the power balance of the whole system. An adaptive droop control strategy for multibus DC microgrid based on consensus algorithm is proposed. It is based on platform multiagent system, which is realized by network protocol. Under the condition of a weak communication network, the bus at all levels can realize regional power autonomy through packet consensus protocol. A hybrid simulation platform composed of Jade, MacSimJX, and Simulink is built to verify the effectiveness of the control strategy.

scholarly journals Precise Reactive Power-Voltage Droop Control of Parallel Virtual Synchronous Generators that Considers Line Impedance

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1344
Author(s):  
Xiangwu Yan ◽  
Hongbin Ma ◽  
Jiaoxin Jia ◽  
Waseem Aslam ◽  
Chenguang Wang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Integrated Control ◽  
Synchronous Generator ◽  
Control Voltage ◽  
Droop Control ◽  
Parallel Operation ◽  
Distributed Generators ◽  
Power Decoupling ◽  
Virtual Synchronous Generator

Problems such as high power coupling, low distribution accuracy, and insufficient reactive power-voltage droop accuracy occur when distributed generators are operated in parallel due to the influence of line impedance. The precise control of output reactive power and voltage is difficult to achieve using traditional virtual synchronous generator (VSG) control. Taking this into consideration, this study proposes a virtual synchronous generator reactive power-voltage integrated control strategy that considers line parameters to solve this problem. First, the impedance voltage drop of the line is compensated for in accordance with local information control to ensure the consistency of the control voltage in parallel operation of distributed generators and to realize the precise droop control of reactive power and the voltage of the point of common coupling (UPCC). Second, virtual negative impedance control is added to change the equivalent output impedance characteristics of the system and achieve power decoupling. On this basis, the active frequency and reactive voltage decoupling control effect of the improved control strategy is quantified and analyzed using the relative gain matrix. The accuracy of reactive power distribution and droop control is theoretically derived and analyzed by establishing a small-signal model of a two-machine parallel system. Finally, the accuracy and effectiveness of the proposed integrated control strategy are verified via a simulation model and an experimental platform for parallel operation. Results show that the proposed integrated control strategy can effectively solve the problems of power decoupling and accurate distribution, reduce system loop current, and realize accurate reactive power-voltage droop. Compared with the traditional VSG control strategy, the dynamic deviation of UPCC is reduced by at least 40% when a large-scale load disturbance occurs.

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