Novel phase locking method applicable to three-phase grid voltage
A three-phase grid and voltage technology, applied in the field of power electronics, can solve problems such as unbalanced grid voltage, achieve precise grid phase tracking, improve phase-locking accuracy, and strong grid adaptability
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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 a double 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...
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