consumption analysis method for optimizing reactive compensation at mv
TRANSCRIPT
Consumption
analysis method for
optimizing reactive
compensation MV
Essential to take measures
reactive power to be compensated must be chosen after making a measurement
with a network analyzer?
How many ?
Period of time
“Large enough to be considered as a representative and realistic”
< t >
Samplingfrequency
Period of time
“Use a sampling rate as low as possible to observe more closely the fluctuations of loads”
Seasonality
< t >
Period of time
Samplingfrequency
“Power consumption may differ depending on the time of year”
Existing capacitor
bank
< t >
Period of time
Samplingfrequency
Seasonality
“A capacitor bank will interfere with the acquired data and distort the data collected”
Analyzing the measurements
A histogram is a graphical representation ofthe distribution of numerical data. It is an estimate ofthe probability distribution of a continuous variable.
Roughly assess the probability distribution of a givenvariable by depicting the frequencies of observationsoccurring in certain ranges of values
Histogram
Histogram
Measure Histogram Analyze
Histogram
Three-phase Inductive reactive power consumptionMeasures at 6,6 kV
Histogram
Interval size
𝑆 =𝑋𝑀𝐴𝑋 − 𝑋𝑀𝐼𝑁
2 · 𝑁
Maximum value Minimum value
Number of values
Histogram
< i >
Interval
Data
Excel
Histogram
Histogram
Interval Frequency % accumulated
100 0 0,00%
200 0 0,00%
300 0 0,00%
400 0 0,00%
500 65 11,40%
600 29 16,49%
700 20 20,00%
800 12 22,11%
900 52 31,23%
1000 73 44,04%
1100 66 55,61%
1200 21 59,30%
1300 17 62,28%
1400 115 82,46%
1500 48 90,88%
1600 3 91,40%
1700 23 95,44%
1800 14 97,89%
1900 1 98,07%
2000 3 98,60%
2100 4 99,30%
2200 0 99,30%
2300 1 99,47%
2400 0 99,47%
2500 0 99,47%
2600 3 100,00%
500+1000 kvar
Histogram
cos phi above 0,95 more than 98% of the time
Harmonics in the installation
Parallel Resonance
𝑓𝑅 = 𝑓 ∙𝑆𝑆𝐶𝑄
Parallel Resonance
Damage in MV capacitor due
parallel resonance
Parallel Resonance