It is well known that the burning of fossil fuel (oil, gas, and coal) in combustion engines, mostly in generating electricity, contributes climate exchange with Greenhouse Gases (GHG)
The Kyoto Protocol treaty was negotiated in 1997 to control emissions of the main anthropogenic greenhouse gases...
It is well known that the burning of fossil fuel (oil, gas, and coal) in combustion engines, mostly in generating electricity, contributes climate exchange with Greenhouse Gases (GHG)
The Kyoto Protocol treaty was negotiated in 1997 to control emissions of the main anthropogenic greenhouse gases and resulted in the 2015 adoption of the Paris Agreement
The development of renewable energy sources (RES) is very important to efforts to address global climate change.
When distributed resources (DRs) from RES are connected to the distribution line (DL), these can cause power quality problems such as overvoltage, voltage drop, etc., and many countries set their own power quality standards to guide for proper DRs Applications.
In DRs connected power system, one of the most difficult parameters to meet power quality standard is overvoltage. The requirement for overvoltage standards often leads reduction of generator capacity or project abandonment, which creates negative effects on RES developments.
As solution for overvoltage problem, this paper studies on the device to mitigate the voltage rise on the generator side in a power system.
Real data for voltage rise with power system paralleling were collected from micro hydro, photovoltaic and wind power plants, and these voltage rise phenomena were verified using vectorial analysis.
As one method for voltage rise reduction, the addition of transmission line parameters, such as resistance, capacitance and inductance was considered, but this method was not successful.
However, as effective solution for voltage rise, this paper suggests the voltage control devices, such as capacitor bank or reactor and it was found that reactor effectively reduces voltage rise and this solution was verified by vetorial analysis.
The basics for proper reactor capacity calculation was described with vector diagram and the best position of reactor in a power system was discussed. Additionally, example graphs for protection relay coordination in the reactor connected system were presented and the criteria with logical block diagrams for reactor operation were explained.
Based on this method, the reactor addition method was testified in a real power plant, whose a synchronous generator was under voltage rise limitation that generates only 67% of the rated output.
The 705㎸A reactor was calculated for voltage rise reduction, but 860㎸A reactor was installed with consideration about voltage fluctuation in DL.
In case of photovoltaic power plant for identical generation capacity, the required reactor was 1,144㎸A. Without reactor, to meet voltage rise requirements, the synchronous generator should reduce their generating capacity as 1,554㎸A and 1,215㎸A for the photovoltaic power.
Three important results of in real site test are summarized. For several tests with similar output conditions between reactor all OFF and ON, the voltage rise reduced as 2.32% with reactor addition method. Even the generator output incensed by about 480㎾, the voltage in DL was decreased by 339V. In monthly average, the voltage in DL was decreased by 232V during the generator output was restored to the rated value as 100% from 67% limitation.
These results can be regarded as the effect of the reactor, which is opposed to the fact that the voltage in DL is raised in proportion to the generator output.
Reviewing the economic advantages in reactor addition method, the cost of reactor addition can be refunded in about 37 days.
However, following additional studies are required as future works.
It is possible to adjust the power factor up to ±95% for solar generators, but it is not admitted in Korea's standard for interconnecting DRs at DL and installation of reactors is not allowed in solar power plants either. To apply results of suggested method, the detailed research on this issue and improving restrictions are needed.
When the induction generators are connected to DL, the capacitor is added to adjust the power factor to 90%, which results in voltage rise. The detailed research about this phenomenon and solutions are needed.
It is well known that the burning of fossil fuel (oil, gas, and coal) in combustion engines, mostly in generating electricity, contributes climate exchange with Greenhouse Gases (GHG)
The Kyoto Protocol treaty was negotiated in 1997 to control emissions of the main anthropogenic greenhouse gases and resulted in the 2015 adoption of the Paris Agreement
The development of renewable energy sources (RES) is very important to efforts to address global climate change.
When distributed resources (DRs) from RES are connected to the distribution line (DL), these can cause power quality problems such as overvoltage, voltage drop, etc., and many countries set their own power quality standards to guide for proper DRs Applications.
In DRs connected power system, one of the most difficult parameters to meet power quality standard is overvoltage. The requirement for overvoltage standards often leads reduction of generator capacity or project abandonment, which creates negative effects on RES developments.
As solution for overvoltage problem, this paper studies on the device to mitigate the voltage rise on the generator side in a power system.
Real data for voltage rise with power system paralleling were collected from micro hydro, photovoltaic and wind power plants, and these voltage rise phenomena were verified using vectorial analysis.
As one method for voltage rise reduction, the addition of transmission line parameters, such as resistance, capacitance and inductance was considered, but this method was not successful.
However, as effective solution for voltage rise, this paper suggests the voltage control devices, such as capacitor bank or reactor and it was found that reactor effectively reduces voltage rise and this solution was verified by vetorial analysis.
The basics for proper reactor capacity calculation was described with vector diagram and the best position of reactor in a power system was discussed. Additionally, example graphs for protection relay coordination in the reactor connected system were presented and the criteria with logical block diagrams for reactor operation were explained.
Based on this method, the reactor addition method was testified in a real power plant, whose a synchronous generator was under voltage rise limitation that generates only 67% of the rated output.
The 705㎸A reactor was calculated for voltage rise reduction, but 860㎸A reactor was installed with consideration about voltage fluctuation in DL.
In case of photovoltaic power plant for identical generation capacity, the required reactor was 1,144㎸A. Without reactor, to meet voltage rise requirements, the synchronous generator should reduce their generating capacity as 1,554㎸A and 1,215㎸A for the photovoltaic power.
Three important results of in real site test are summarized. For several tests with similar output conditions between reactor all OFF and ON, the voltage rise reduced as 2.32% with reactor addition method. Even the generator output incensed by about 480㎾, the voltage in DL was decreased by 339V. In monthly average, the voltage in DL was decreased by 232V during the generator output was restored to the rated value as 100% from 67% limitation.
These results can be regarded as the effect of the reactor, which is opposed to the fact that the voltage in DL is raised in proportion to the generator output.
Reviewing the economic advantages in reactor addition method, the cost of reactor addition can be refunded in about 37 days.
However, following additional studies are required as future works.
It is possible to adjust the power factor up to ±95% for solar generators, but it is not admitted in Korea's standard for interconnecting DRs at DL and installation of reactors is not allowed in solar power plants either. To apply results of suggested method, the detailed research on this issue and improving restrictions are needed.
When the induction generators are connected to DL, the capacitor is added to adjust the power factor to 90%, which results in voltage rise. The detailed research about this phenomenon and solutions are needed.
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