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STPM32 Datasheet(PDF) 30 Page - STMicroelectronics |
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STPM32 Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 89 page  Figure 34. Fundamental active power and energy calculation block diagram IIPx IINx PLNA VIPx VINx HPF HPF ROCOIL INT BHPFVx BHPFCx ROCx Vx Data [23:0] Vx [23:0] Cx [23:0] bsV bsC CHVx[11:0] CHCx[11:0] Phase Compensation Phase Compensation Cx Data [23:0] ADC ADC LPF Offset Σ LED OFAFx[9:0] PHx Momentary Fundamental Power[28:0] PHx Fundamental Power[28:0] PHx Fundamental Energy[31:0] LPF LPF Vx Fund[23:0] Cx Fund[23:0] Results of the calculated quantities are stored in the registers as follows: EF1 = primary current channel active fundamental energy PH1 Fundamental Energy[31:0] F1 = primary current channel active fundamental Power PH1 Fundamental Power[28:0] f1(t) = primary current channel instantaneous active fundamental power PH1 Momentary Fundamental Power [28:0] EF2 = secondary current channel active fundamental energy PH2 Fundamental Energy[31:0] F2 = secondary current channel active fundamental power PH2 Fundamental Power[28:0] f2(t) = secondary current channel instantaneous active fundamental power PH2 Momentary Fundamental Power [28:0] The fundamental active power measurements have a bandwidth of 80 Hz. 8.4.3 Reactive power and energy calculation The signal chain for the reactive power, energy calculations and related frequency conversion are shown in Figure 35. The instantaneous reactive power signal is generated by multiplying the filtered signals of current and voltage. This value can be compensated by the reactive power offset calibration block (OFRx[8:0] in DSP_CR10 and DSP_CR12). The DC component of the instantaneous power signal is extracted from LPF to obtain the reactive power information. Figure 35. Reactive power and energy calculation block diagram IIPx IINx PLNA VIPx VINx HPF HPF ROCOIL INT BHPFVx BHPFCx ROCx Vx Data [23:0] Vx [23:0] Cx [23:0] bsV bsC CHVx[11:0] CHCx[11:0] Phase Compensation Phase Compensation Cx Data [23:0] ADC ADC LPF Offset Σ LED OFRx[9:0] PHx Momentary Reactive Power[28:0] PHx Reactive Power[28:0] PHx Reactive Energy[31:0] LPF LPF Vx Fund[23:0] Cx Fund[23:0] Reactive Filter BLPFVx 0 1 BLPFCx 1 0 Results of the calculated quantities are stored in the registers as follows: EQ1 = primary current channel reactive energy PH1 Reactive Energy[31:0] Q1 = primary current channel reactive power PH1 Reactive Power[28:0] q1(t) = primary current channel instantaneous reactive power PH1 Momentary Reactive Power[28:0] EQ2 = secondary current channel reactive energy PH2 Reactive Energy[31:0] STPM32, STPM33, STPM34 Functional description of hardwired DSP DS10272 - Rev 13 page 30/89 |
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