Flexible DC transmission dynamic stability determining and controlling method
A flexible DC power transmission and dynamic stability technology, applied in the direction of AC power input conversion to DC power output, AC network circuit, AC power input conversion to AC power output, etc. Conducive to engineering practice, the method is simple and easy to implement
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. A method for judging the dynamic stability of flexible direct current transmission in the present invention comprises the following steps:
[0030] Step 1: Unlock the converter station of the HVDC system, so that the HVDC system operates in a non-islanding control mode; Step 2: Extract the corresponding parameters of the HVDC system, the parameters include the effective value of the AC system voltage U t0 , flexible DC output reactive power Q vsc0 , the gain k of the phase-locked loop PLL p and the proportional-integral time constant k of the phase-locked loop PLL i ;Step 3: Taking the rated capacity of the converter station and the AC system voltage as the reference value, calculate the short-circuit ratio SCR, and calculate U t0 , Q vsc0 The per unit value of ; Step 4: Calculate the key stable component where ω is the angular fr...
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