Protection and Control of Modern Power Systems

Table 3 Low voltage ride through parameters of voltage asymmetric sag

From: A novel low voltage ride through strategy for cascaded power electronic transformer

	Variable	No load	Full load
	Variable	No load	Rectified state	Inverter state
Before Voltage sag	\( {P}^{\ast}\left({i}_{d0}^{\ast}\right) \)	0	1	−1
Before Voltage sag	\( {Q}^{\ast}\left({i}_{q0}^{\ast}\right) \)	0	0	0
After Voltage Sag α = 0.4	\( {i}_{d+}^{+\ast } \)	0	1.112	−1.112
	\( {i}_{q+}^{+\ast } \)	0.45	0.45	0.45
	\( {i}_{d-}^{-\ast } \)	0	0	0
	\( {i}_{q-}^{-\ast } \)	0	0	0

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