Phase Locked Loop

Contains the declarations and procedures to implement Phase Locked Loop. More...

Modules
	Macros
	Type Definitions
	Structures
	Functions

Detailed Description

The first step for grid phase detection is to assign suitable compensator values and phase detection error settings for the PLL structure. Once configured the PLL should be run in every cycle to detect the voltage phase. Below programming example further describes the module usage

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Grid Voltage Phase Detection

pll_lock_t pll = {0};
 
// Initializes the PLL module
void Init (void)
{
 pll.coords = &gridTie.vCoor;
 pll.compensator.Kp = .001f;
 pll.compensator.Ki = .8f;
 pll.compensator.dt = PWM_PERIOD_s;
 pll.expectedGridFreq = 50;
 pll.qLockMax = 10;
 pll.dLockMin = 255;
 pll.dLockMax = 375;
 pll.cycleCount = (int)((1 / PWM_PERIOD_s) * 2);
 PLL_Init(&pll);
}
 
// Poll the PLL module on every cycle and connect to the output if PLL is locked else disconnect
void Poll(void)
{
 if (Pll_LockGrid(&pll) == PLL_LOCKED)
     GenerateOutput();
 else
     DisconnectOutput();
}