3.4.5 Per-Cycle Accumulated Reactive Power Quantities
The metrology module generates the following accumulated reactive power (Q) quantities: CYCLE_Q_A, CYCLE_Q_B, CYCLE_Q_C, CYCLE_Q_A_F, CYCLE_Q_B_F, CYCLE_Q_C_F, CYCLE_Q_N, CYCLE_Q_N_F.
They are in units of [VAR samp-scaled]. They are scaled accumulated reactive power quantities in the last line cycle measurement period. They are calculated according to the following formulas:
Where,
- V’_x_samplei is ith filtered phase voltage value of phase x in present cycle
- V’_avc_samplei is ith filtered phase voltage value of the active voltage channel (according to STATE_FLAG.TIMING_Vx) in present cycle
- I’’_x_samplei is ith filtered phase current value of phase x in present cycle
- V’_x_samplei, V’_avc_samplei and I’’_x_samplei have additional 90 degree phase difference
- N = The number of samples in the last cycle
They are used to calculate the reactive power. In the case of the neutral channel, it is useful for calculating the angle of the neutral current.
The CYCLE_Q_x and CYCLE_Q_x_F are stored in the sQ23.40 format.
| Name: | CYCLE_Q_A, CYCLE_Q_B, CYCLE_Q_C, CYCLE_Q_A_F, CYCLE_Q_B_F, CYCLE_Q_C_F, CYCLE_Q_N, CYCLE_Q_N_F |
| Property: | Read |
| Bit | 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | |
| CYCLE_Q_x/CYCLE_Q_x_F[63:56] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | |
| CYCLE_Q_x/CYCLE_Q_x_F[55:48] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | |
| CYCLE_Q_x/CYCLE_Q_x_F[47:40] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 | |
| CYCLE_Q_x/CYCLE_Q_x_F[39:32] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| CYCLE_Q_x/CYCLE_Q_x_F[31:24] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| CYCLE_Q_x/CYCLE_Q_x_F[23:16] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| CYCLE_Q_x/CYCLE_Q_x_F[15:8] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| CYCLE_Q_x/CYCLE_Q_x_F[7:0] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |