Design of Droop-based Control for Power Management in Islanded RL-type Microgrids

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
Mohammad Imran Azim ◽  
Jahangir Hossain ◽  
Hemanshu Pota
Keyword(s):  
Power Management ◽  
Reference Values ◽  
Transmission Lines ◽  
Control Strategy ◽  
Dynamic Performance ◽  
Power Sharing ◽  
System Stability ◽  
Control Law ◽  
Sharing Scheme ◽  
New Type

Abstract This paper proposes a new type of generalized droop-based proportional power sharing scheme during load change for parallel inverter-interfaced islanded microgrids, which is an automatic strategy and is independent of any particular nature of transmission lines, i.e., resistive or inductive. Real and reactive powers are shared in proportion to the droop gains by implementing the voltage control law proposed in this paper; in which the inverter-interfaced voltage-sources are kept at equal reference values. The control gains are chosen based on eigenvalue analysis in a way that the system stability is ascertained. The performance of the designed controller is simulated under different microgrid structures such as load variation and various types of transmission lines; in which the results show superior dynamic performance in comparison to the conventional droop-based control strategy.

scholarly journals A Multi-Index Feedback Linearization Control for a Buck-Boost Converter

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1496
Author(s):  
Xiaocong Li ◽  
Xin Chen
Keyword(s):  
Control Strategy ◽  
Feedback Linearization ◽  
Structural Characteristics ◽  
Dynamic Performance ◽  
Boost Converter ◽  
Control Law ◽  
Output Function ◽  
Multi Index ◽  
Feedback Linearization Control ◽  
Linear Subsystem

Due to the nonlinear and nonminimum phase characteristics of the buck-boost converter, the design of its controller has always been a challenging problem. In this paper, a multi-index feedback linearization control strategy is proposed to design the controller of the buck-boost converter. Firstly, by constructing an appropriate output function, the original nonlinear system is mapped into a combination of a linear subsystem and a nonlinear subsystem. Then, according to the structural characteristics of these two subsystems, the linear optimal control theory is adopted for the control design of the linear subsystem to make it have a good output performance, while for the nonlinear subsystem, the coefficient of the output function is adjusted to ensure its stability. Finally, based on the Hartman–Grobman theorem, the internal mechanism and coefficient adjustment basis of the proposed method are revealed; that is, by adjusting the coefficient of the output function and the feedback coefficient of the linear control law, the poles of the system are configured to achieve the purpose of adjusting the static and dynamic performance of the system. The simulation results show the feasibility and superiority of using the multi-index feedback linearization control strategy to design the nonlinear control law of the buck-boost converter.

Research on Power Management Control Strategy for Photovoltaic Power System

2014 ◽  
Vol 513-517 ◽  
pp. 3438-3441
Author(s):  
Chun Long Zhang ◽  
Bin Wu
Keyword(s):  
Solar Cell ◽  
Power System ◽  
Power Management ◽  
Control Strategy ◽  
High Efficiency ◽  
Dynamic Performance ◽  
Management Control ◽  
Cell Array ◽  
Power Management Strategy ◽  
Photovoltaic Power

A novel power management control strategy for photovoltaic power system is proposed. The solar cell array powers the steady state energy and the battery compensates the dynamic energy in the system. The goal of the power management control strategy is to control the un-directional DC-DC converter and bi-direction DC-DC converter to operate in suitable modes according to the condition of solar cell and battery, so as to coordinate the two sources of solar cell and battery supplying power and ensure the system operates with high efficiency and behaviors with good dynamic performance. A 500W experimental prototype of photovoltaic power system was built in the lab. Experimental results are shown to verify the effectiveness of the proposed power management strategy..

The Application of Model-Referenced Adaptive Control to Robotic Manipulators

1979 ◽  
Vol 101 (3) ◽  
pp. 193-200 ◽  
Author(s):  
S. Dubowsky ◽  
D. T. DesForges
Keyword(s):  
Adaptive Control ◽  
Dynamic Performance ◽  
Robotic Manipulators ◽  
System Stability ◽  
Control Law ◽  
Control Methods ◽  
Wide Range ◽  
Abrupt Changes ◽  
Signal Approach ◽  
Adaptive Control Law

The achievement of quality dynamic performance in manipulator systems is difficult using conventional control methods because of both the inherent geometric nonlinearities of these systems and the dependence of the system dynamics on the characteristics of manipulated objects. A model-referenced adaptive control law is developed for maintaining uniformly good performance over a wide range of motions and payloads. The effectiveness of the approach is demonstrated in several simulations and the system stability as a function of input is investigated. Also developed is a “learning signal” approach designed to minimize initial transients arising from abrupt changes in the inertial payload.

Variable gain control-based acceleration slip regulation control algorithm for four-wheel independent drive electric vehicle

2020 ◽  
pp. 014233122093342
Author(s):  
Luole Guo ◽  
Hongbing Xu ◽  
Jianxiao Zou ◽  
Hongyu Jie ◽  
Gang Zheng
Keyword(s):  
Electric Vehicle ◽  
Control Strategy ◽  
Large Scale ◽  
Dynamic Performance ◽  
Gain Control ◽  
Scalar Function ◽  
System Stability ◽  
Slip Ratio ◽  
Variable Gain ◽  
Optimal Slip Ratio

In order to improve the dynamic performance and stability of general acceleration slip regulation (ASR) control technology for four-wheel independent drive electric vehicle (4WID EV), an ASR control strategy based on variable gain controller (VGC) is proposed in this paper. First of all, a road identification strategy is designed to identify the current road surface and calculate the optimal slip ratio of the road. Then, the optimal slip ratio is taken as the control target, and the ASR control strategy based on VGC is designed to keeps slip ratio around the optimum slip ratio through controlling the driving torque output, so wheels can make the best of road adhesion to prevent vehicle from slipping. Meanwhile, we analyze the control system state space, and build a scalar function of the system, and prove that the system satisfies Lyapunov large scale asymptotic stability theorem, so the parameters of the VGC does not affect the system stability. Then, in order to meet the requirement of quick dynamic response and no overshoot, parameters selection of VGC is deduced by mathematics. Finally, the co-simulation of Matlab/Simulink and Carsim results show that the proposed control strategy is with the better dynamics and stability, and can better prevent wheel slipping on various roads.

scholarly journals Deadbeat PQ Control for Islanded Smart Grids

2020 ◽  
Vol 4 (5) ◽  
Author(s):  
Ehab Bayoumi ◽  
Mostafa Soliman ◽  
Hisham Soliman
Keyword(s):  
Distributed Generation ◽  
Smart Grids ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Power Sharing ◽  
System Stability ◽  
Pwm Inverter ◽  
Three Phase ◽  
Micro Grids ◽  
Selection Of

The dynamic performance of smart (micro)grids depends on the proper selection of the controller gains and power-sharing parameters. This manuscript describes the control design to achieve a deadbeat desirable performance in terms of: i) Zero steady-state error. ii) Minimum rise time. iii) Minimum settling time. iv) Less than 2% overshoot/undershoot. This paper considers an Islanded microgrid system composed of two distributed generation (DG) units. Each DG unit includes three-phase pulse width modulation (PWM) inverter. The proposed controllers are proportional- integral (PI) type. The Controllers gains of the inverters and the Phase Locked Loop (PLL) parameters are designed to guarantee deadbeat dynamic performance in terms of minimal overshoot and system stability. The Particle Swarm Optimization (PSO) is used to tune the controller parameters of the current, PQ loops, and the PLL. The proposed controllers are compared with the traditional (Ziegler and Nichols), auto-tuned, and interior-point methods to shows the excellence of the proposed technique. Results authenticate and endorse the effectiveness of the proposed controllers and PLL design technique to achieve the desired deadbeat response of the study microgrid system.

scholarly journals Development of a Smart Energy Community by Coupling Neighbouring Community Microgrids for Enhanced Power Sharing Using Customised Droop Control

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5383
Author(s):  
Sandipan Patra ◽  
Sreedhar Madichetty ◽  
Malabika Basu
Keyword(s):  
Dynamic Performance ◽  
Coupled System ◽  
Power Sharing ◽  
System Stability ◽  
Droop Control ◽  
Mode Of Operation ◽  
Energy Community ◽  
Efficient Power ◽  
Equal Power ◽  
Selection Of

This article aims to develop a smart isolated energy community (EC) by coupling the neighbouring rural community microgrids (CMGs) with enhanced droop control for efficient power sharing. This recommended solution employs a power management (PM) based droop-control to enable independent neighbouring CMGs to share power on an available basis by not constraining CMG inverters to equal power sharing. During the grid-connected mode, the droop control may have different power setpoints of each CMG. However, during the standalone mode of operation, the power setpoint should be defined according to their power rating and availability to maintain the system stability. In this article, a PM strategy is developed to maintain the power setpoints of the autonomous CMGs. An improper selection of power setpoints in autonomous CMG can raise the DC link voltage to an unmanageable value and can cause an inadvertent shutdown of CMG. The suggested PM-based droop control enables the CMG inverter not to restrict the inverter to equal power share but to distribute its active power as available in an asymmetric way, if required. The dynamic performance of the proposed coupled system incorporated with two remote isolated CMGs is investigated in a MATLAB environment. Further, a laboratory prototype of the proposed system has been developed using a LabVIEW-based sbRIO controller to verify the efficacy of the proposed approach.

Damping Inter-Area Oscillations by Coordination of 3PSS and UPFC Using PSO

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Ali Abdulazeez ◽  
Bassam Mohammed ◽  
Bilal Nasir ◽  
Mohammed Yasen
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Dynamic Performance ◽  
System Stability ◽  
Local Mode ◽  
Flexible Alternating Current Transmission ◽  
Bus Voltage ◽  
System Stabilizer

Power System Stabilizer (PSS) is one of the most used controllers in the local generations, primarily it aimed to suppress local mode of oscillations. On the other hand, the Unified Power Flow Controllers (UPFC) the most versatile member of flexible alternating current transmission system devices to simultaneously control real and reactive power flows on transmission lines, as well as regulate selected bus voltage. Each of these controllers, on their own, can show satisfactory performance to enhance power system stability. However, when they utilized together, their dynamic performance can degrade due to controller interaction, that should be strategically optimized. In this paper, the coordinated design of pss's and upfc is realized to damp inter-area oscillations in  two-area power system using particle swarm optimization (PSO) method. The simulated cases in Matlab environment show that the interaction of pss's and upfc can be optimized, so the inter-area oscillations can be effectively mitigated following after fault, the simulation results of the uncoordinated design are also presented.

A Power Sharing Method for Parallel Inverters with Virtual Synchronous Generator Control Strategy

2016 ◽  
Vol 4 (2) ◽  
pp. 317
Author(s):  
Sara Yahia Altahir Mohamed ◽  
Xiangwu Yan
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Voltage Drop ◽  
Synchronous Generator ◽  
Power Sharing ◽  
System Stability ◽  
Droop Control ◽  
Active And Reactive Power ◽  
Virtual Inertia ◽  
Virtual Synchronous Generator

<p>A new power sharing method of a virtual sychronous generator control based inverters is introduced in this paper. Since virtual synchronous generator has virtual inertia and damping properties, it significantly enhances the grid stability. However, its output power considerably affects by the line impedance. Thus, in this paper, the relation between the droop control and the line impedance is analyzed at first. Then, by appling an improved droop control strategy to an inverter based on the virtual sychronous generator control, achieving proportional active and reactive power sharing unaffected by the line impedance is realized. The result shows that a smooth response is achieved. As well as, the voltage drop caused by the line impedance is totally compensated. As a result, the system stability is furtherly improved. At last, the effectiveness of the proposed method is verified through MATLAB/Simulink.</p>

A power management and control strategy with grid-ancillary services for a microgrid based on DC Bus

2014 ◽  
Vol 9 (4) ◽  
pp. 792 ◽  
Author(s):  
Anna Pinnarelli ◽  
Giuseppe Barone ◽  
Giovanni Brusco ◽  
Alessandro Burgio ◽  
Daniele Menniti ◽  
...  
Keyword(s):  
Power Management ◽  
Control Strategy ◽  
Ancillary Services ◽  
Dc Bus ◽  
And Control
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