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At the 2016 China Photovoltaic Leaders Summit Forum held on April 26, Ding Jie, deputy director of the New Energy Research Institute of the China Electric Power Research Institute, said in a keynote speech that photovoltaic power generation has been generated for many years, and everyone knows that photovoltaic power plants are different from conventional power stations, and due to wind power, the intermittency and randomness of photovoltaic power generation have brought many grid-connected problems
.
Many power stations are plagued by light abandonment and power rationing, and often do not pay enough attention
to problems caused by voltage stability, system frequency regulation and peak shaving, power quality problems and islands.
Ding Jie also said that although the domestic power station has been in operation for many years, there are still many problems, from the construction of the power station, quality acceptance, long-distance travel to the later evaluation, some problems are mainly manifested in the power attenuation of photovoltaic modules, photovoltaic module cracking, photovoltaic module hot spot phenomenon, photovoltaic module adaptation deviation and photovoltaic module power generation uneven.
For centralized ground photovoltaic power plants, active control, reactive voltage control, power prediction, fault ride-through, and related technical requirements have national or industry standards
.
It should be pointed out that this is an emerging industry, and it is reasonable that some standards are lacking in production and operation, so many standards are being revised and improved
.
Active control technology is especially important
for grid connection, especially for the dispatch of photovoltaic power plants.
Due to the fact that curtailment and power rationing have not been effectively solved, everyone has not paid enough attention
to the refined operation of power control.
In power dispatching, the active can be adjusted according to the system command, and the active can
be automatically adjusted according to the frequency of the system.
There are many modes of active regulation, and which mode to use in which case is crucial
.
Photovoltaic power station grid-connected technology also involves reactive power control, giving full play to the reactive power regulation ability of the photovoltaic power station inverter, which can reduce the investment in the capacity of the reactive power compensation device of the power station, which is the technological progress
of the grid-connected inverter.
For photovoltaic power generation prediction technology, Ding Jie believes that reasonable arrangement of photovoltaic power generation plans can improve the safety, reliability and photovoltaic absorption capacity
of the power grid.
In the operation of photovoltaic power plants, we all know that it involves three key links, one is numerical weather prediction technology; The second is the quality of the meteorological station of the photovoltaic power station, whether the real-time collection is accurate and reliable, and whether it is stable and reliable; The third is modeling and real-time positive technology
.
If this is done well, it provides a valuable reference for the dispatch of the power grid company, and the output of the power station is correspondingly guaranteed
.
For the fault ride-through in the current photovoltaic grid-connected, Ding Jie said that the latest standards contain high-voltage, low-voltage and zero-voltage ride-through and other grid-connected requirements
.
This is a short-circuit experiment we did in Qinghai in 2013, when Qinghai was the province with the largest grid-connected volume in the country, and the results of photovoltaic power plants that passed the field test and the photovoltaic power station that did not carry out the field test were very different, and the off-grid inverter of the power station that had not been tested on the spot was much larger than the
former.
This is anti-islanding technology, and the latest technology has been able to prevent islanding without blind zones
when the power station is running.
At the 2016 China Photovoltaic Leaders Summit Forum held on April 26, Ding Jie, deputy director of the New Energy Research Institute of the China Electric Power Research Institute, said in a keynote speech that photovoltaic power generation has been generated for many years, and everyone knows that photovoltaic power plants are different from conventional power stations, and due to wind power, the intermittency and randomness of photovoltaic power generation have brought many grid-connected problems
.
Many power stations are plagued by light abandonment and power rationing, and often do not pay enough attention
to problems caused by voltage stability, system frequency regulation and peak shaving, power quality problems and islands.
Ding Jie also said that although the domestic power station has been in operation for many years, there are still many problems, from the construction of the power station, quality acceptance, long-distance travel to the later evaluation, some problems are mainly manifested in the power attenuation of photovoltaic modules, photovoltaic module cracking, photovoltaic module hot spot phenomenon, photovoltaic module adaptation deviation and photovoltaic module power generation uneven.
For centralized ground photovoltaic power plants, active control, reactive voltage control, power prediction, fault ride-through, and related technical requirements have national or industry standards
.
It should be pointed out that this is an emerging industry, and it is reasonable that some standards are lacking in production and operation, so many standards are being revised and improved
.
Active control technology is especially important
for grid connection, especially for the dispatch of photovoltaic power plants.
Due to the fact that curtailment and power rationing have not been effectively solved, everyone has not paid enough attention
to the refined operation of power control.
In power dispatching, the active can be adjusted according to the system command, and the active can
be automatically adjusted according to the frequency of the system.
There are many modes of active regulation, and which mode to use in which case is crucial
.
Photovoltaic power station grid-connected technology also involves reactive power control, giving full play to the reactive power regulation ability of the photovoltaic power station inverter, which can reduce the investment in the capacity of the reactive power compensation device of the power station, which is the technological progress
of the grid-connected inverter.
For photovoltaic power generation prediction technology, Ding Jie believes that reasonable arrangement of photovoltaic power generation plans can improve the safety, reliability and photovoltaic absorption capacity
of the power grid.
In the operation of photovoltaic power plants, we all know that it involves three key links, one is numerical weather prediction technology; The second is the quality of the meteorological station of the photovoltaic power station, whether the real-time collection is accurate and reliable, and whether it is stable and reliable; The third is modeling and real-time positive technology
.
If this is done well, it provides a valuable reference for the dispatch of the power grid company, and the output of the power station is correspondingly guaranteed
.
For the fault ride-through in the current photovoltaic grid-connected, Ding Jie said that the latest standards contain high-voltage, low-voltage and zero-voltage ride-through and other grid-connected requirements
.
This is a short-circuit experiment we did in Qinghai in 2013, when Qinghai was the province with the largest grid-connected volume in the country, and the results of photovoltaic power plants that passed the field test and the photovoltaic power station that did not carry out the field test were very different, and the off-grid inverter of the power station that had not been tested on the spot was much larger than the
former.
This is anti-islanding technology, and the latest technology has been able to prevent islanding without blind zones
when the power station is running.
