Continuous introduction of recent national
policies and measures to support distributed generation, encourages units,
installation of community and family, the use of photovoltaic power generation
system, orderly construction of photovoltaic power plants. From a global
perspective, the development of photovoltaic system good countries, such as
Germany, Italy, the United States, Australia and other countries, distributed
photovoltaic power generation has been the main form of photovoltaic
development, accounting for over 80%.
Solid Dulwich PV solar panel inverters have been used
in tens of thousands of distributed power generation systems, and has
accumulated rich experience. My opinion, the distributed power generation
system based on in-depth analysis and forward-looking forecasts global
distributed generation,
Conversion efficiency, such as the
photovoltaic system, the sunlight by the solar panel converts DC (panel the
conversion efficiency, is usually 15% -18%), the DC and then converted into
alternating current by the photovoltaic inverter, and the grid connection
(inverter conversion efficiency, typically 96% -98.8%); the inverter MPPT
tracking efficiency. The conversion efficiency reflects some point, the ability
of the system output power. The MPPT tracking efficiency is reflected any point
in time, the inverter system can track the maximum power point, the system has
a maximum power output capacity.
Efficiency (ie, the conversion efficiency
the the MPPT tracking efficiency of both the organic combination) is the
primary factor considered by the distributed power generation system to
determine the ROI of the system, is the focus of the industry. Therefore become
a pillar of the distributed generation system. Solid Dulwich on this indicator
reached world-class level. Latest PHOTON test report (December 2012) shows
solid Dulwich GW4KW-SS Ranked first in the world in the same power inverter, a
full range of global top three Asia-Pacific region, in the domestic
counterparts absolutely leading .
Renewable energy generation in general has
a gap characteristics, generating instability, poor power quality, wind power,
photovoltaic power generation even become a "spam," or even abandoned
or deny access. Is an important indicator for measuring power quality THDi, the
total current harmonic distortion, the distortion the more powerful, the worse
the power solar charge controller quality in accordance with international norms and requirements, THDi
can not exceed 5%, otherwise the grid can refuse access. The industry standard
is generally 2% to 3%. Solid Dulwich at the international advanced level in the
indicators, a full range of less than 1%. As follows:
In accordance with the dynamic point of
view, if the current rate of 2% to 3%, 5 years after the harmonic distortion of
the power station may decay to 3% -4%, after 10 years may exceed 5%, so that
the power station will be barred from access to the grid ( and in the the grid
proportion of the increase with the generating capacity of distributed systems,
the power grid is likely to improve the the THDi standard). So, THDi
distributed generation systems need to focus on the second pillar.
A complete, rational design of distributed
power generation system, you need to have the power storage function, that is,
the energy storage capability. Because the gap characteristics of distributed power
generation systems, leading to their input on the grid is not uniform, a
tremendous impact when distributed large-scale power generation connected to
the grid when the input is not balanced be grid (grid to protect the stability
and reliability power supply.
Therefore, distributed power generation
system requirements with storage capabilities, and through its own storage to
stabilize itself (or nearest) generating electricity peak load shifting wrong
valley phenomenon. In Europe, Germany
and other distributed photovoltaic rapid development of the country, have been
aware of this problem, and substantive measures to encourage distributed
generation system with storage function. Therefore, storage of electricity has
become the third pillar of distributed generation.
Management of distributed systems,
including "self-management" and "management" two functions.
The "self-management" system management system through the inverter,
power generation data monitoring, storage, analysis, upgrade, optimization. "Management"
side starting from the point of view of the large power grids, the grid after
the acceptance of a large-scale distributed generation system, from the angle
of the grid unified scheduling, accept its unified scheduling requirements of
distributed power generation systems.
Such as the German implementation 2012EEG
standard requirements of distributed power generation systems unconditional
acceptance of the grid scheduling in grid overload, the grid can be unified to
send commands to distributed generation system derating to 60%, 30%, and even
direct allowed Stop input grid. Solid Dulwich its full range of PV soalr cell inverters
have this "management" capabilities, but also fully compliant with
the latest requirements German EEG2012 new energy regulations, by connecting
with PM + Solar-Log grid has become rare to have such the strength of the
inverter company.
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