A phase-locking method suitable for three-phase grid voltage
A three-phase power grid and voltage technology, applied in the field of phase locking, can solve problems such as unbalanced power grid voltage, achieve precise grid phase tracking, strong grid adaptability, and improve the effect of phase locking accuracy
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[0028] The method of the present invention comprises the following steps:
[0029] Step 1, the three-phase grid voltage V abc After Clark transformation, the three-phase grid voltage V abc Transform from a three-phase stationary coordinate system to a two-phase stationary coordinate system v αβ , the α-axis leads the β-axis by 90 degrees in phase angle.
[0030] Step 2, two-phase stationary coordinate system v αβ The fundamental positive sequence component is obtained after the fundamental positive sequence component extraction unit and The fundamental wave positive sequence component extraction unit includes an improved second-order generalized integrator (SOGI) and a positive sequence fundamental wave logic operation unit. The transfer function of the improved SOGI is:
[0031]
[0032]
[0033] Among them, D(s) and Q(s) are the transfer function expressions of the improved SOGI, s is the Laplace transform operator, τ is the inertial time constant, qv′ is the o...
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