scholarly journals Fuzzy Mathematics-Based Outer-Loop Control Method for Converter-Connected Distributed Generation and Storage Devices in Micro-Grids

Computation ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 134
Author(s):  
Lorena Castro ◽  
Maximiliano Bueno-López ◽  
Juan Mora-Flórez
Keyword(s):  
Control Method ◽  
Voltage Source ◽  
Real Field ◽  
Fuzzy Mathematics ◽  
Voltage Source Converter ◽  
Outer Loop ◽  
Storage Devices ◽  
Micro Grid ◽  
Micro Grids ◽  
And Storage

The modern changes in electric systems present new issues for control strategies. When power converters and distributed energy resources are included in the micro-grid, its model is more complex than the simplified representations used, sometimes losing essential data. This paper proposes a unified fuzzy mathematics-based control method applied to the outer loop of a voltage source converter (VSC) in both grid-connected and islanded modes to avoid using simplified models in complex micro-grids and handle the uncertain and non-stationary behaviour of nonlinear systems. The proposed control method is straightforwardly designed without simplifying the controlled system. This paper explains the design of a fuzzy mathematics-based control method applied to the outer-loop of a VSC, a crucial device for integrating renewable sources and storage devices in a micro-grid. Simulation results validated the novel control strategy, demonstrating its capabilities for real field applications.

scholarly journals Vector Control of VSC HVDC System under Single Line to Ground Fault Condition

2018 ◽  
Vol 7 (1) ◽  
pp. 59
Author(s):  
Prabodha Kumar Rath ◽  
Kanhu Charan Bhuyan
Keyword(s):  
Vector Control ◽  
Reactive Power ◽  
Control Method ◽  
System Stability ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Control Loop ◽  
Hvdc System ◽  
Ground Fault

<span lang="EN-US">This paper proposes a model of a VSC (voltage source converter) based Back to Back HVDC system and its control technique under fault condition. From the mathematical model of the system relationship between the controlling and the controlled variables is determined to control the system parameters. An appropriate vector control technique is used to control active and reactive power and to maintain DC link voltage. The proposed controlling unit consists of outer control loop and inner control loop which effectively damped out the system oscillation and maintains the system stability. The validity of the model and the feasibility of the control method have been proved by the simulation results. In this paper the system performance is studied under fault condition is studied.</span>

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.

Control and modulation methods of voltage source converter

2009 ◽  
Vol 57 (4) ◽  
pp. 323-336
Author(s):  
G. Radomski
Keyword(s):  
Dead Time ◽  
Control Method ◽  
Negative Influence ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
State Function ◽  
Space Vector Pwm ◽  
Paper Model ◽  
Simulation And Experiment ◽  
Modulation Methods

Control and modulation methods of voltage source converterControl and modulation methods of Voltage Source Converter (VSC) have been presented in the paper. Model of VSC with three value transistor branch state function is introduced to describe operation of VSC. Predictive-corrective control method of VSC system is presented. Two variants of Space Vector PWM methods for VSC system are developed. Algorithm of cancelation of negative influence of dead time on the AC voltages is implemented in the proposed modulation methods. Correctness of introduced method is validated by simulation and experiment investigations.

Voltage Compensation with Interline Power Flow Controller (IPFC) Using Control Magnitude and Phase Angle Control

2014 ◽  
Vol 626 ◽  
pp. 184-189
Author(s):  
A.S. Monikandan ◽  
N. Kesavan Nair
Keyword(s):  
Phase Angle ◽  
Power Flow ◽  
Degrees Of Freedom ◽  
Reactive Power ◽  
Control Method ◽  
Transmission System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Flow Controller ◽  
Power Flow Controller

The Interline Power Flow Controller (IPFC) is a voltage-source-converter (VSC)-based flexible ac transmission system (FACTS) controller for series compensation in a multiline transmission system of a substation. The capability of injecting series voltages with controllable magnitude and phase angle makes it a powerful tool for better utilization of existing transmission lines in a multiline transmission system. IPFC is used to regulate active and reactive power flow in a multiline system, usually. In this paper, a control method for IPFC is proposed to control magnitude and phase angle of one sending bus of a substation. All degrees of freedom of IPFC and decoupled synchronous frame concept are used in the proposed control structure. Simulation results in Matlab/Simulink are presented to show the capability of IPFC in compensating the bus voltage.

scholarly journals POWER SYNCHRONIZATION CONTROL OF VSC-HVDC TRANSMISSION FOR WEAK AC SYSTEM

2013 ◽  
pp. 221-225
Author(s):  
SEENA. K. R ◽  
SINDHU.T. K
Keyword(s):  
Control Method ◽  
Short Circuit ◽  
Vector Current ◽  
Current Control ◽  
Voltage Source ◽  
Synchronization Control ◽  
Voltage Source Converter ◽  
Hvdc Transmission ◽  
Ac Systems ◽  
Weak Ac System

In this paper voltage source converter based HVDC transmission system is used for connecting two ac systems. The control method used is power synchronization control. This method is different from other control methods and it uses the internal synchronization mechanism in ac systems. It is applied for all grid connected VSC’s especially for HVDC application. This control method gives strong voltage support to a weak ac system. It shows that the proposed control allows 0.86 p.u power to be transferred from a system with short circuit ratio of 1.2 to a system with an SCR of 1.The result is compared with the vector current control for the same ac system where it can transfer only 0.4 p.u. The simulations in MATLAB/Simulink are done to demonstrate the system and observe the system behavior under three phase AC faults.

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