Roadmap to Membership of RICS - Pathways and Routes
ppt.pptx
1. An Improved Adaptive Control Strategy in Grid-Tied PV System With
Active Power Filter for Power Quality Enhancement
DEPARTMENT OF ELECTRICAL AND ELCTRONICS ENGINEERING
Presented by: Under The Guidance Of:
2. ABSTRACT
• Grid-connected photovoltaic (PV) systems are increasingly attracting the attention of industry and academia as a means of providing an
alternative to conventional fossil-fuel generation and pollution-free power.This project aims to improve the power quality level of a
grid-tied PV distribution system using shunt active power filter (APF) along with adaptive current control technique.
• In this work Fuzzy logic proportional–integrator–derivative multiple complex coefficient filter multiple second-order generalized
integrator frequency-locked loop (FLPID-MCCF-MSOGI-FLL) hybrid control scheme is used to destroy the voltage and current
harmonics in a grid-tied PV system.
• The main objective of using MSOGI-FLL reference current generation strategy is implemented to mitigate the current harmonics by
extracting the fundamental constituents (FCs) from the nonlinear load currents. MCCF is employed to separate the FC from the
distorted grid voltages and eliminates the voltage harmonics during extremely polluted grid voltage condition.
• FLPID is to maintain the stable power between dc and ac sides by regulating the dc-link voltage constant under transient conditions.
ANFIS is used to track the maximum power from the PV panel under varying environmental condition.
• The comparative analysis is analyzed to check the effectiveness of the proposed hybrid control scheme with existing and adaptive
control techniques in respect of power quality, better dc offset rejection, better FC and frequency extraction, and grid synchronization.
3. • Increasing the power quality in a distribution network through the use of an advanced control has gain a lot of interest
among power electronics and power system research community.
• Electrical distribution side is getting polluted due to increased proliferation of power electronics based household,
commercial, as well as industrial nonlinear loads. These nonlinear loads feed harmonic currents leading to increased
loss, harmonics, and voltage distortion, which in turn severely influence the quality of power and stability.
• PV panel comprises of huge number of solar based cells associated in series or parallel so as to get the required current
and voltage. A solar cell's voltage, current or resistance may vary in light exposure. Excess electron - hole pairs are
generated when a solar cell is illuminated and current flows through the electrically shortened p - n junction.
• Solar PV power is pollution-free power generating resource widely used to meet the energy demand, which improves the
reliability and power quality while reducing the burden on the central grid.
INTRODUCTION
4. PROBLEM IDENTIFICATION
• Conventional energy sources such as natural gas, oil, coal, or nuclear are finite but still hold the majority of the energy
market. Conventional energy systems have several drawbacks, such as dependence on fossil fuels, lower efficiencies and
wasted heat. conventional energy systems can damage climate, air, water, land, and the urban environment, leading to
occupational and public health or fire risks, solar energy technologies can be considered as almost absolutely clean and
safe. Their applications have significant socioeconomic benefits, such as security of energy supply and provision of job
opportunities.
• This research accounts for the problems existing in conventional methods for generating electricity and presents an
overview of various renewable energy generation technologies that are being developed to promote renewable energy.
• Traditionally passive filters have been employed to figure out the problems but at the cost, tuning and series-parallel
resonance problem. Thus to avoid these problems, active power filters (APFs) and moreover shunt types have been widely
used as a viable solution. Along with the power quality improvement, pollution-free clean energy production is another key
matter of concern.
• In this regard, integration of renewable energy sources such as photovoltaic (PV) to grid-connected and a standalone
system is growing exponentially. In this research, to extract maximum power from the solar panel, a solar PV system with
MPPT algorithm is designed and simulated.
5. • Enhancing the power quality level of a grid-tied PV distribution
system using hybrid control scheme along with shunt active power
filter.
AIM
6. • To improve the power quality level of a grid-tied PV distribution system using shunt active
power filter (APF) along with adaptive current control technique.
• To destroy the voltage and current harmonics in a grid-tied PV system using FLPID-MCCF-
MSOGI-FLL hybrid control scheme
• To mitigate the current harmonics by extracting the FC from the nonlinear load currents
using MSOGI-FLL reference current generation strategy.
• To separate the FCs from the extremely polluted grid voltages using MCCF. Moreover, it is
also used for grid synchronization.
• To design a fuzzy tuned PID adaptive dc-link control algorithm to preserve the balanced
power between dc and ac terminals by keeping the dc terminal voltage constant.
• To track the maximum power from the PV panel using Optimization based techniques (PSO
Optimization).
• To compare the proposed control scheme with conventional control schemes in terms of
harmonic mitigation, dc offset rejection, fundamental component extraction, and grid
synchronization.
OBJECTIVES
7. •MPPT controller implemented for PV system to extract maximum power. Due to
the installation of non-linear loads in the proposed HRES grid-connected systems
power quality problems occurred in system. To mitigate these PQ problems a
suitable control structure is designed for voltage source converter of PV system.
• Basically a conventional PI controller is used to regulate the dc-link voltage and
active powers of system.
• To achieve better harmonic distortions, the parameters of PI controller is tuned
with one of the optimization technique called as BAT algorithm.
•These proposed grid connected PV system under power quality improvement is
implemented and tested in MATLAB/Simulink
METHODOLOGY
8. Photovoltaic systems
A photovoltaic cell is a semi conductor device that converts light to
electrical energy by photovoltaic effect.
Photovoltaic systems that use batteries as the only storage system
and in which the voltage varies slightly only due to the state of
charge.
The main applications of pv systems are either stand-alone (water
pumping, domestic and street lightning ,electric vehicles).
10. Modelling of PV System:
Iph = photocurrent,
ID = diode current,
I0 = saturation current,
A = ideality factor,
q = electronic charge 1.6x10-9,
kB = Boltzmann’s gas constant (1.38x10-
23),
T = cell temperature,
Rs = series resistance,
Rsh = shunt resistance,
I = cell current,
V = cell voltage
IPV = Output current of solar cell (A).
VPV = Solar cell operating voltage (V).
PPV =Output power of solar cell (W).
I=Iph-ID
14. • The proposed hybrid control scheme, as shown in Fig., incorporates FLPID,
MCCF, and MSOGI-QSG-FLL control algorithms. This combination achieves to
separate the better FCs from the extremely polluted grid voltages as well as load
currents.
• The MCCF technique is used to separate the FCs from extremely polluted grid
voltages and the MSOGI-QSG-FLL algorithm is designed to separate the FCs
from the nonlinear currents consequently generates the three-phase reference
currents.
• The FLPID voltage controller is used to keeping the stable power at the VSI
output.
17. • Figure shows, the grid current control system at the grid connected operation mode. When the main grid is in a
normal situation, the STS is closed, and the three-phase inverter with the LCL filter is connected to the main grid
through the STS. The d−q grid current references can be calculated from the desired active and reactive powers,
and the PI controller is used to regulate the d−q grid currents.
• The outputs of the voltage controller Vdmv and Vqmv at the instant of transfer from voltage control to current
control mode remain constant during the grid-connected operation. As the outputs of both controllers are
connected, the d−q grid currents can be controlled by the outputs of the d−q current controllers Vdmc and Vqmc
around the fixed Vdmv and Vqmv in order to prevent a sudden change of the outputs of the grid current PI
controllers at the mode transfer instant.
26. Conclusion:
• Commercially available smart PV inverters can further provide frequency down-regulation by curtailing
power, but they are unable to provide true frequency regulation through active power control (APC)
because they are unable to increase power on command. A coordinated DC-link voltage control and
deloading control for two-stage PV system to offer frequency support in an islanded microgrid without
energy storage system (ESS) is implemented. A PI based PV inverter control is developed for very fast
and accurate control of active power.
