LLC – Lead-lag compensator

Block SymbolLicensing group: STANDARD

Function Description
The LLC block is a discrete simulator of integral-derivative element

C (s) = \frac{a * tau * s + 1}{tau * s + 1},

where tau is the denominator time constant and the time constant of numerator is an a-multiple of tau $(a * tau)$ . If $ISSF = on$ , then the state of the filter is set to the steady value at the block initialization according to the input signal u.

The exact discretization at the sampling instants is used for discretization of the $C (s)$ transfer function. The sampling period used for discretization is equivalent to the execution period of the LLC block.

Input

u	Analog input of the block	Double (F64)
R1	Block reset (same state as after init)	Bool
HLD	Hold block execution	Bool

Output

y	Analog output of the block	Double (F64)

Parameters

tau	Time constant $⊙$ 1.0	Double (F64)
a	Numerator time constant coefficient	Double (F64)
ISSF	Steady state at start-up	Bool
	off .. Zero initial state on ... Initial steady state

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