Control and Implementation of a Standalone Solar Photo-Voltaic Hybrid System
Abstract
This project presents a control algorithm for a standalone solar photovoltaic (PV)-diesel-battery hybrid system is implemented. The proposed system deals with the intermittent nature of the energy generated by the PV array and it also provides power quality improvement. The PV array is integrated through a DC-DC boost converter and controlled using a maximum power point tracking (MPPT) algorithm to obtain the maximum power under varying operating conditions. The battery energy storage system (BESS) is integrated to the diesel engine generator (DG) set for the coordinated load management and power flow within the system. The admittance based control algorithm is used for load balancing, harmonics elimination and reactive power compensation under three phase four-wire linear and nonlinear loads. A four-leg voltage source converter (VSC) with BESS also provides neutral current compensation.
Existing method
The existing method describes a CTF (Character Triangle Function) based control approach and its analysis for four- wire standalone distribution system are demonstrated. An EPLL (Enhanced Phase Locked Loop) based control approach, wherein 3 EPLLs are used for extraction of fundamental active and reactive power components of load currents. However, only simulation studies are presented. A composite observer based control approach for standalone PV-DG based system is used.
Proposed method
The proposed method describes an admittance based control algorithm is applied for the evaluation of reference power component of source currents in PV-DG hybrid system. The admittance of the load is estimated using the active and reactive powers of the load. The conductance (GL) and susceptance (BL) are extracted from the estimated active power and reactive power of the three-phase four-wire loads respectively. It is a simple mathematical formulation based on sinusoidal Fryze current control. This control strategy is based on the Lagrange‟s multiplier method and the fundamental principle of the PQ theory where the computation through the Clarke‟s transformation is eliminated. Therefore it provides an improvement in the mathematical calculations.
Block diagram
Schematic diagram of the proposed system
Advantages
1. The utilization of the PV power generation is for the reason that it has many advantages such as it gives clean power, it is portable in nature and can be employed for various small scale applications.
2. It should be noted that the novel feature of the proposed system is the advanced algorithm for control of the VSC of a standalone system which not only helps in integration of renewable energy source but also serves for improvement in power quality in standalone system.
Applications
- Amongst the available renewable energy resources, solar photovoltaic (PV) power generation is gaining wide acceptance and it is used for various applications such as household appliances, remote missions, data communications, telecommunication systems, hospitals, electric aircrafts and solar cars.
Extension topic:
This project is have two extensions.
- In mppt controller we are we using icm with pi controller.(this for rectifier controller)
- Inverter controller is also havePi controller.
- These two pi controllers are are replaced with fuzzy logic controller.
Further Details Contact: A Vinay 9030333433, 08772261612
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