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| Fig:-What if we receive solar power output suppression |
There may be many people who are worried about the price of solar power selling, which is decreasing year by year. In particular, you may abandon your investment because of the risk that you may not be able to sell electricity due to “output suppression”. However, there are few people who know exactly when and where “output suppression” will be implemented. Before you start investing in photovoltaic power generation, let's check the questionable “output suppression” and how to avoid it.
Output control- to maintain a balance between supply and demand
Solar power output suppression (voltage
suppression), simply stated, refers to a mechanism in which an electric power
company temporarily stops purchasing electricity. In other words, while the
output is being suppressed, no matter how blessed the weather is, you cannot
sell electricity.
Why is output suppression performed?
This is to maintain a balance between power supply
and demand. For example, there is no problem in generating electricity during
the summer and winter when the demand for electricity increases due to air
conditioning, but the amount of electricity generated may exceed the demand
during the spring and autumn when the frequency of air-conditioning usage
decreases. In order to maintain this balance, the upper limit of the voltage in
the electric wire and the power conditioner is set to 107V. When the voltage in
the electric wire reaches the upper limit, it is suppressed so that the
generated electricity cannot be output to the electric wire.
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| Fig:-voltage suppression |
However, the solar output suppression order is after
the adjustment of thermal power and biomass, etc., and only when there is a
considerable oversupply until the actual output suppression is applied. Since
home solar power generation is small and often self-consumption, it is said
that there is little impact on output suppression, so there is no need to worry
too much about small-scale facilities.
The FIT law revision also affects the “Fixed Price Purchase System”
Originally, output control was limited to “equipment
of 500 kW or more”, but the scope was expanded to “less than 500 kW including
household use.
In the background, about 90% of the FIT certified
amount is commercial solar, which necessitates the introduction of balanced
solar power generation, and the burden on the public has increased due to the
expansion of power purchase costs.
As a result,
the balance between supply and demand was lost, and there was a concern that
solar and wind power generation would exceed power consumption if all of the
applied solar and wind power generation systems were operated.
Such supply and demand issues have also affected the
fixed-price purchase system, and facilities that exceed 2,000 kW (500 kW in
FY2019) will be placed in the bidding system. Even for small-scale facilities
of less than 10kW, there is a difference in price depending on whether or not
equipment for output control is required.
What are the measures to avoid output suppression?
Even though small-scale solar power generation
systems have come to receive output suppression, is there actually any output
suppression? Of course, it depends on the solar power penetration rate in the
installation area, but how about it?
However, there is almost no impact on household
equipment of less than 10kW, and the problem is equipment of 10kW or more, but
most of them are less than 50kW because of the lack of land.
However, these can be avoided by increasing the set
voltage of the inverter, utilizing a storage battery, or purchasing insurance.
Take measures to reduce output with "storage
battery" and "insurance"
There are three possible ways to avoid output
suppression. First, increase the set voltage of the power conditioner, then
install a storage battery and prepare an electricity storage location. Finally,
you can get insurance.When adjusting the voltage of the first power
conditioner, care must be taken not to violate the Electricity Business Law.
In the case
of home use, it may lead to failure, so let's talk to a professional first. A
storage battery is a facility that can store electricity generated during the
day, and it can be used without waste during the output suppression period.
The other insurance provides a service that
compensates for the loss of profits from electricity sales due to output
restraints, and can provide stable profits even when there is a limit. In
addition to this, the compensation includes not only this, but also
compensation for profits from power sales in the event that power generation is
not possible due to a natural disaster or disaster, making it perfect for those
who want to make stable investments.
Preventing damage by subscribing to “storage battery” or “insurance”
Output suppression is a system that can
significantly reduce the amount of power sold, but it has a priority order and
is not a concern for home use. Even for business use, you can prevent damages
by introducing storage batteries or subscribing to insurance.
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