Doubly-fed generator simulation system and method considering crowbar protection
A doubly-fed generator and crowbar protection technology, applied in the field of power systems, can solve the problems of lack of analysis of the influence of crowbars, low accuracy of short-circuit current expressions, and inability to analyze DFIG transient characteristics.
Active Publication Date: 2018-04-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Generally speaking, in the prior art, in the DFIG simulation analysis method considering crowbar protection, the unit transient characteristics analysis for asymmetric faults is less, and some approximations and assumptions are made in the analysis of the flux linkage process of the stator and rotor, and the derivation The accuracy of the short-circuit current expression is low, and there is no analysis of the influence of crowbar circuit resistance and motor speed on the flux amplitude, phase and characteristic root, so it is impossible to effectively analyze the transient characteristics of DFIG taking crowbar protection into account. analyze
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[0217] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0218] First, unify the meaning of the symbols that appear in the text:
[0219] The subscript c represents the electrical quantity after the crowbar protection action;
[0220] R rc = R r +R cb , which is the sum of rotor resistance and rotor protection resistance;
[0221] t 2 is the failure time;
[0222] u sc , u rc i sc i rc 、ψ sc 、ψ rc are the space vectors of the stator and rotor voltage, current and flux linkage of the doubly-fed generator, respectively;
[0223] u sc+ , u rc+ i sc+ i rc+ 、ψ sc+ 、ψ rc+ are the space vectors of the stator and rotor positive sequence voltage, positive sequence current and positive sequence flux linkage of the doubly-fed generator, respectively;
[0224] u sc- , u rc- i sc- i rc- 、ψ sc- 、ψ rc- are the space vectors of stator and rotor negative-sequence voltage, negative-sequence current and negative-sequ...
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A doubly-fed generator simulation system and method considering crowbar protection, said system comprising: fault data acquisition module, positive sequence flux linkage calculation module, positive sequence current calculation module, negative sequence flux linkage calculation module, negative sequence current Calculation module, fault current output module; the fault data acquisition module is used to collect positive sequence voltage, negative sequence voltage and unit state parameters before and after the fault, and the positive sequence flux linkage calculation module and negative sequence flux linkage calculation module are respectively connected to the positive sequence current The calculation module and the negative sequence current calculation module, the positive sequence current calculation module is used to calculate the positive sequence component of the short circuit current, the negative sequence current calculation module is used to calculate the negative sequence component of the short circuit current, and the fault current output module is used to calculate and output the short circuit current. The double-fed generator simulation system and method considering the crowbar protection of the present invention can accurately describe the transient characteristics of the double-fed generator under various short-circuit faults.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to power system relay protection equipment and methods. Background technique [0002] At present, in the grid-connected guidelines of wind farms formulated by countries all over the world, it is clearly required that wind turbines have low-voltage ride-through capabilities. The doubly-fed induction generator (DFIG) has the characteristics of small capacity and small size of the excitation frequency conversion device, so it is widely used. DFIG is essentially a wound rotor motor. Because its stator and rotor are both It can feed power to the grid, so it is called double-fed generator. The stator voltage of DFIG is provided by the grid, and the rotor voltage is provided by the converter. The DFIG system allows variable speed operation within a defined wide range. The converter compensates for the difference between the mechanical frequency and the electrical frequency by inje...
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IPC IPC(8): G06F17/50
Inventor 马静黄天意刘畅邱扬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)