Main objectiveTo evaluate Solar Power Plant impact on network operation and to determine maximum solar PV power that can be installed at the connection point. Performed calculationsLong-time voltage level, voltage fluctuation, harmonics, short circuits. Analyzed minimal loading system operation mode. Voltage level and fluctuationsCalculations are performed assuming the worst-case scenario: all other solar power plants connected to the same distribution line are operating at maximum installed power and energy consumption is equal to zero. It is assumed that other solar power plants generate only active power. Analyzed 1.5 MVA solar power plant generation is evaluated with power factor („PF“) values of -0.9, 0, and +0.9. Based on calculation results, solar power plant connected to the network would increase voltages at other substations on this line by 5 %.
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 Figure 1. Modeled network scheme |
Because voltage change in the power plant turning on/off case is higher than 5%, the amount of permissible voltage changes is limited (up to 4 times a day). As power generation depends on the level of cloudiness, the number of voltage fluctuations can increase. Because of that, the designed 1,5 MVA Solar power plant does not meet requirements for energy quality.
Based on energy quality requirements for voltage, in this particular case, it would be recommended to install a power plant that would generate voltage fluctuations at a connection point not greater than 3%. Such requirement would be met by 1,15 MVA power plants operating at PF=0 operation mode or 0,84 MVA power plants operating at PF = -0.9 mode. Since electrical network legislation requires for the power plant to be able to operate at PF ≠ 0 mode, it is only possible to connect the power plant with lower installed power.
Designed Solar power plant generated total harmonic voltages distortion at the connection point is significantly lower (0,2%) comparing to standard limits (8%), THD of harmonic currents is 0,855%.
All harmonics are within permissible limits.
Figure 2. Harmonic currents
Figure 3. Harmonic voltages
Solar power plant-generated short circuit current is up to 6.5% from the overall network and power plant short circuit current.
Before each new release of EA-PSM Electric, validation cases are prepared, thus ensuring new features are working properly. At this validation case, arc flash scenarios for three-phase medium voltage and low voltage systems according to the IEEE 1584-2018 standard are analysed.
Scheme link element is dedicated to dividing the scheme into logical blocks thus reducing graphics lag and allowing to calculate equivalents
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