Pursuant to Article 116 of the Energy Law

4.3.7.
 
V
OLTAGE 
C
ONTROL
 
4.3.7.1. Generation unit, except for wind generators, must be capable of excising voltage 
control within the range presented in Figure 4.3 permanently for the normal voltage range of 
the transmission grid, or temporarily, when the voltage is outside normal range in accordance 
with point 4.3.8.2.1. and regardless of its participation in the primary and secondary control, 
where: 
U
nom
– nominal voltage of the transmission grid where the facility is connected; 
U
m
– voltage of the transmission grid at the connection point; 
cosφ – power factor at the connection point. 
4.3.7.2. Wind-generation unit must be able to perform voltage control within the marked area 
in Figure 4.3, but only for the range: 
0.95 capacitive ≤ cosφ ≤ 0.95 inductive. 
4.3.7.3. Statism coefficient of voltage control on busbar transmission grid that is connected to 
power (ΔUm / ΔQel) must be adjustable in the range of -1.5% to -6%.
4.3.7.4. In the case of voltage drop below the range of normal operating voltage, generator 
unit must have the ability to increase the excitation current of at least 2% for each percent 
decrease in voltage outside the normal operating range, up to the amount of 160%.
Increasing the excitation current must begin no later than 20 ms after of voltage drop and last 
at least 500 ms after the voltage returns to the normal operating range, but no longer than 10 
seconds from start of voltage drop. 

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42 
 
 
 
 
 
 
 
 
 
Figure 4.3 
4.3.8.
 
DISCONNECTING