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UM1561 датащи(PDF) 26 Page - STMicroelectronics

номер детали UM1561
подробное описание детали  This document describes how the firmware to manage the 250 W micro-inverter demo
PDF  39 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1561 датащи(HTML) 26 Page - STMicroelectronics

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Implementation of digital phase locked loop
UM1561
26/39
Doc ID 023556 Rev 1
where:
●
37150
is (AC voltage protection based on Vq value).
The figure code shows the procedure to control the AC line before the microinverter start-
up: in this example, the AC line voltage must be comprised between 185 V and 265 V and
the frequency between 47 Hz and 53 Hz. If these conditions are satisfied for a fixed time
(10 sec), the state machine goes to the next step (DC-DC/DC-AC turned on).
//****************** ANTI-ISLANDING DETECTION *****************************
if(((Theta+0x8000)-Theta_previous)<=-20000)
{
zero_detect++;
//************* DIAGNOSTIC AC - VOLTAGE AND FREQ AT STARTUP ***************
//Freq 47 Hz - 53 Hz
//Vac 185V - 265V
if((State_Control==DIAGNOSTIC_AC_LINE) ||
(State_Control==DIAGNOSTIC_DC_LINE))
{
if((Theta_time>331 && Theta_time<375) && (VqFiltered_mean >= 37150 &&
VqFiltered_mean<=39080))
{
if(freq_monitor_time>=500) //10 sec
{
GDVoltage = GRID_VOLTAGE_INSIDE_RANGE;
Freq_Control = FREQ_INSIDE_RANGE;
freq_monitor_time=0;
}
if(Freq_Control==FREQ_OUT_OF_RANGE && GDVoltage ==
GRID_VOLTAGE_OUT_OF_RANGE)
freq_monitor_time++;
}
else
{
freq_monitor_time=0;
Grid_Voltage_max=0;
Grid_Voltage_min=0;
}
}
where:
●
37150
is (AC voltage RMS monitoring)
●
375
is (AC frequency monitoring)
●
500
is (listening time).



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