Transcript Diapositiva 1

PV Converter & Controller: How to
improve the performance and
smartness of your solar system
Dr. Walter Marin, PhD Power Electronic
Protronic Group Strategic Business Partner
Foreword
Solar panels offer the opportunity to tap into a limitless
energy source and contribute to national energy selfsufficiency. The solar inverter is a critical component of
an entire solar energy system. It performs the conversion
of the variable dc output of the PV cells into a clean
sinusoidal 50-Hz or 60-Hz voltage source suitable for
supplying the commercial electrical grid or local electrical
network.
Impressive progress has been made to date improving
the materials that convert solar energy to electrical
power. Equally important, however, are the challenges of
maximizing the efficiency and smartness of the overall
system.
Walter Marin’s CV
Walter Marin, PhD Power Electronic, is an engineer
with 25 years experience in researching, designing,
manufacturing and marketing Power Inverter in range
from 100 W to 20 kW. He participated in pioneering
the high-frequency power inverter in welding
application; as results of his valuable job a paper
“Electronic Welder with high-frequency resonant
inverter” appears in Industry Applications Society
Annual Meeting, 1993, Conference Record of the
1993 IEEE where a new generation of electronics
welders, incorporating soft-switched inverters driving
high-frequency transformers, is presented.
Since then, he has been furthering his design and research in the
European and US industry, manufacturing hundred of thousands power
inverters light, reliable and flexible offering to the market products with good
efficiency, fast response and control robustness at competitive price.
Recently he has joined Protronic Far East Ltd, Protronic Group, as
Strategic Business Partner driving the design and marketing of the Green
Line Products in the company mainly system controllers, true sine
wave converter and grid tie converter.
Company Profile
Protronic Group is an HK based electronic company with
strong R&D, Engineering, Design and Manufacturing
capacity in electronic products including power and
energy products, automotive electronics and security
products.
ProUser Green Power is a division of Protronic Group
providing:
• Stand-Alone Technology in most of the developing
countries;
• Grid Connected Technology in the developed countries;
• Engineering, Procurement and Construction (EPC)
service and management for the MW-sized solar plant
commissioned by our customer.
Solar System Configuration
STAND ALONE SYSTEM
GRID CONNECTED SYSTEM
Solar Panel: Non Constant Input
Negative Voc temperature coefficent
Positive Jsc temperature coefficent
Stand Alone Configuration
• MPPT System Controller
• True Sine Wave Converter
MPPT Solar System Controller
MPPT Solar System Controller is a
battery charger and load controller
for stand alone PV (photovoltaic)
systems. This controller features a
smart tracking algorithm that
maximizes energy harvest from
solar panels. The controller also
prevents over charge or deep
discharge. It provides automatic
load control for the external load
connected to the controller.
MPPT Solar System Controller
• MPPT Solar System Controller
optimizes battery charging process
increases battery life, minimizes
battery maintenance, and improves
system performance. Moreover a
software algoritm manipulates the
current to give the perfect State of
Charge (SoC) to the battery
regardless the ambient condition.
MPPT Solar System Controller
• Maximum Power Point Tracking,
referred to as MPPT, is an electronic
system
that
operates
the
photovoltaic modules to produce
maximum power. MPPT varies the
electrical operating point of the
modules and enables them to
deliver maximum available power.
The additional power harvested
increases the current available for
battery charging.
MPPT Solar System Controller
• MPPT solar system controller achieves the target to
harvest 40% more power from the solar panel in
comparison with the conventional controller
True Sine Wave Converter
• 12/24/48Vdc Automatic Detection
Input Voltage
• THD very minimize; less than 3%
• Max. Efficiency more than 90%
• Easy Connection in Parallel when
the electricity needs increase
• Simple Human Interface
Grid Connected Converter
• Solar energy is converted into electricity and fed
into the public grid.
• Efficient, reliable, high power inverters are
the heart of any PV system.
• The development of PV inverters is driven by
new technologies, by innovative solutions, and
by completely new answers. The result: highly
performance mains-connected inverters,
which interact optimally with all solar
modules and smartly with all grid.
Grid Connected Configuration
Grid Connected Converter
• High conversion efficiency/boosting
system with Smart Maximum Power
Point Tracking function;
• DSP based fully digital control to operate
sophisticated algorythm;
• High efficiency: 93% to 96%;
• Power Factor close to 1;
• THD according local regulations;
• Voltage and Frequency fed according
local regulations;
• Anti-islanding function;
• Energy Monitoring via RS232, USB and
Wireless comunication
• Long Life usage: MTBF > 100,000 hours
Key Product Issues
• Optimize MPPT algorythms
• High Frequency Transformer Technology
offers maximum output in minimum space
• Grid monitoring has to be very accurate
• European approval IEC 61727, IEC
61000-3-2 and IEC 61000-3-3
• UL approval IEE 922
Grid Connected Inverter Topology
Grid Connected Inverter Topology
5kWp Grid Connected System
MW-sized Grid Connected System
Connection to the Grid
Optimization of power flow and
transmission
efficiency
in
weak
distribution grids and micro-grids by
means of cooperative operation of
distributed power electronics units is
becoming a big issue nowdays.
Connection to the Grid
Distribution grids are increasingly populated by a variety
of renewable energy sources, which create new
opportunities in terms of efficient use of energy and can
also help to improve power quality. In fact, they are
connected to the grid by means of Power Switching
Interfaces (PSI) which are capable to control power flow
and waveform of absorbed currents as well. They can
therefore contribute to power flow control and power
quality together with other power electronics units, e.g.,
passive filters, SVC (Static VAR Compensators) and
APF (Active Power Filters). Of course, effective use of
such distributed control capability requires cooperative
operation of power electronics units and proper sharing
of power flowcontrol and compensation duties.
Connection to the Grid
Although unbalance, reactive and harmonic
compensation has been the subject of many
studies and applications the problem is still open
and becomes increasingly difficult and intriguing.
In fact, reference is usually made to grids fed by
power sources of large capacity, which impress
sinusoidal and symmetrical voltages at the Point
of Common Coupling (PCC). Nowadays,
however, this is not generally true, since
proliferation of small power sources and
distorting loads may cause the grid to appear as
a weak power source, characterized by nonnegligible impedance, voltage asymmetry and
distortion.
Contact us
Protronic Group
Unit 2504, 25/F Nanyang Plaza
57 Hung To Road, Kwun Tong
Kowloon, Hong Kong
Land Phone: +852-23308842
E-mail: [email protected]