Oscillation frequency prediction and control method of flexible HVDC transmission in non-islanding control mode
A flexible DC power transmission, flexible DC technology, applied in the direction of reducing/preventing power oscillation, power transmission AC network, etc., can solve the problem of in-depth analysis and other problems, and achieve the effect of simple and easy method.
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the present invention, a method for predicting the oscillation frequency of flexible direct current transmission in a non-islanding control mode comprises the following steps:
[0027] 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 , 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 AC system voltage as the reference value, calculate the predicted oscillation frequency The unit is Hz; Step 4: Check the predicted oscillation frequency Whether it is a non-zero real number; if it is a non-zero real number, the flexible DC transmission...
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