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A Method for Transient Stability Evaluation of Uncertain Power System
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A technology for transient stability assessment, power system, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as unsatisfactory results
Active Publication Date: 2021-08-20
KUNMING UNIV OF SCI & TECH
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[0003] With the widespread access of power electronics and new energy, the operation of power systems has great uncertainty, so traditional power system analysis methods are no longer applicable
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Embodiment 1
[0043] Example 1: An uncertainty power system transient stable assessment method, the specific steps of the discrimination method are as follows:
[0044] Step 1 Create an electromechanical temporary equation of a generator and further obtain its vector form of electromechanical transient equation;
[0045] Step 2 Determine the system's perturbation amount λ;
[0046] Step 3 Establish an electromechanical transient state equation introduced into the disturbance amount λ;
[0047] Step 4 calculate the associated response coefficient using the method of interval Taylor, resulting in the upper and lower limits of the status quadrature system in the transient process of the power system: MIN (MAX) X (T, λ) (1)
[0048] Where X is the status quantity of the system; T is time; λ is the amount of disturbance of the status amount x.
[0049] The specific process is as follows:
[0050] Establish an electromechanical temporary equation of the following generator:
[0051]
[0052] Among ...
Embodiment 2
[0074] Example 2: Such as Figure 1-2 As shown, in order to verify the stability recognition method based on phase traces and transient energy proposed, the MATLABsoftware is applied to verify the single-machine infinity system. The basic parameters of the system are as follows:
[0075] Select the base value, select SB = 250mV · A, UB (220) = 209kV.
[0076]
[0077]
[0078]
[0079]
[0080]
[0081]
[0082] E '= 1.5164
[0083] δ 0 = 27.75 °
[0084] Where SB is the reference power of the system, UB is the reference voltage of the system. Equivalent resistance for generator stator, x 2 Negative sequence reactance, x L1 , X L2 For line 1 and line 2 electric resistance value, X T1 , X T2 The electroda resistance value of the transformer 1 and the transformer 2, respectively, T J Time constant, Transient potential, δ 0 For the angular value.
[0085] Step S1, describe the state equation of the mathematical expression of the generator transient process
[0086]
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Abstract
The invention relates to a transient stability evaluation method of an uncertain power system, which belongs to the field of power system stability. The method of the present invention is: first input the basic structural data of the power system, obtain the electromechanical transient equation describing the generator, and further obtain its state equation in vector form; determine the disturbance quantity λ of the system; establish the method of introducing uncertain variables The uncertain power system transient stability evaluation model uses interval Taylor expansion to calculate the relevant response coefficients, and obtains the upper and lower limits of the state quantity x in the power system transient process. The simulation in the single-machine infinite system shows that the method proposed by the invention can effectively evaluate the transient stability of the uncertain power system.
Description
Technical field [0001] The present invention relates to an uncertainty power system transiently stable assessment method, which belongs to the field of power system stabilization. Background technique [0002] The modern power system has developed into large-scale regional internet grids. This development can bring huge economies, and it will make transient stability more complicated. Transient instability is still one of the biggest threats facing modern power systems. Effective real-time transient stability predictions and emergency control are critical. Traditional transient stability control strategies mainly use the "offline development strategy table, real-time match" control method. There are some deviations in the system model and parameters to affect the accuracy of the calculation results. At present, the commonly used transient stability analysis method sometimes domain simulation, the time domainsimulation method can be used for the inspection of the stability of the...
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