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PIDfuzzy logic hybrid controller for gridconnected photovoltaic inverters View Document
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Nguyen Gia Minh Thao ; Mai Tuan Dat ; Tran Cong Binh ; Nguyen Huu Phuc
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Abstract: This paper presents a novel PIDFuzzy logic hybrid controller to improve the dynamic response of the output active power and reactive power of a grid connected PV inverter. The combination of PID and flexible fuzzy logic controller makes the control of nonlinear objects, such as the electricity grid, more feasible. The proposed integrated PID Fuzzy logic controller module automatically varies the coefficients Kp, Ki, Kd whenever there are any changes of the desired power and load. The comparison of simulation results, obtained separately from a PIDcontroller and a PIDFuzzy controller embedded in a PV inverter, shows the advantages of the proposed algorithm in terms of time response, overshooting and stability error. It also shows that the proposed controller maintains its response better than the PID controller in many aspects, regardless of changes of grid parameters during operation. Published in: Strategic Technology (IFOST), 2010 International Forum on Date of Conference: 1315 Oct. 2010
INSPEC Accession Number: 11697461
Date Added to IEEE Xplore: 13 December 2010
DOI: 10.1109/IFOST.2010.5668024
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Publisher: IEEE Conference Location: Ulsan, Korea (South), Korea (South)
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Contents
SECTION I.
Introduction
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The use of renewable energy is nowadays an advance all over the world when the fossil fuel resources are going to an end and the environment protection is a big issue, while the solar energy considered as an unlimited sustainable power resource is just partially exploited. Thus, solar generators are now playing an everincreasingly important role in delivering electric energy to the power grid.
Abstract
In a gridconnected PV system (Figure 1), independent control of active power and reactive power is essential to be considered [1]. With the nonlinearity characteristics of the grid, it is difficult to identify the dynamic model when the load is varied. The PV inverters using a PID controller have
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IFOST
2010 Proceedings
PID-Fuzzy Logic Hybrid Controller For Grid-Connected Photovoltaic Inverters Nguyen Gia Minh Thao (I) , Mai Tuan Dat(2) , Tran Cong Binh (3) , Nguyen Huu Phuc (4) Faculty of Electrical and Electronics Engineering HoChiMinh City University of Technology (HCMUT) HoChiMinh City, VietNam (1)
[email protected] ,
(2)
[email protected],
- This paper presents a novel PID-Fuzzy logic hybrid controller to improve the dynamic response of the output active power and reactive power of a grid connected PV inverter. The combination of PID and flexible fuzzy logic controller makes the control of nonlinear objects, such as the electricity grid, more feasible. The proposed integrated PID- Fuzzy logic controller module automatically varies the coefficients Kp, Ki, Kd whenever there are any changes of the desired power and load. The comparison of simulation results, obtained separately from a PID-controller and a PID-Fuzzy controller embedded in a PV inverter, shows the advantages of the proposed algorithm in terms of time response, overshooting and stability error. It also shows that the proposed controller maintains its response better than the PID controller in many aspects, regardless of changes of grid parameters during operation.
Abstract
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(3)
[email protected],
(4)
[email protected]
In terms of mathematical model [2], an inverter can be considered as a synchronous generator which delivers energy into the utility grid with RL load (Figure 2). The equivalent circuit of the system is modeled as below. �
�
E
Grid Z
Figure 2.
Re
Equivalent circuit
The relationships of inverter and grid voltages are expressed:
PID controller, PID-Fuzzy controller,
Solar energy, Green Power, Grid- Connected.
I.
where E : inverter output voltage; U : grid voltage; INTRODUCTION
The use of renewable energy is nowadays an advance all over the world when the fossil fuel resources are going to an end and the environment protection is a big issue, while the solar energy considered as an unlimited - sustainable power resource is just partially exploited. Thus, solar generators are now playing an ever-increasingly important role in delivering electric energy to the power grid. In a grid-connected PV system (Figure 1), independent control of active power and reactive power is essential to be considered [1]. With the non-linearity characteristics of the grid, it is difficult to identify the dynamic model when the load is varied. The PV inverters using a PID controller have various drawbacks in terms of tuning coefficients in different models of grid. A novel hybrid controller proposed in this paper is based on the combination of PID controller and fuzzy logic controller, which automatically control the coefficients Kp, Ki, Kd whenever there are any changes of reference power and load. The paper will present the PID-fuzzy logic controller design as well as its MatLab ISimulink simulation results. II.
MATHEMATICAL MODEL OF A GRID CONNECTED PV INVERTER
(Ra + jXs) : inverter impedance The instantaneous voltage of the grid is modeled: u Urn sin(rot) Urnsin(9u) with 9u rot From (1), if Ra<
