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Power grid fault ride-through control method

A control method and grid fault technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of poor stator short-circuit current limitation and grid fault ride-through failure of virtual synchronous generators, and achieve the optimal effect of suppressing stator short-circuit current. Effect

Active Publication Date: 2018-08-21
XUJI GRP +4
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Problems solved by technology

[0009] The purpose of the present invention is to provide a power grid fault ride-through control method, which is used to solve the problem that the virtual synchronous generator stator short-circuit current limit is not good enough to cause its grid fault ride-through failure

Method used

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Embodiment Construction

[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

[0037] Such as figure 2 As shown, the grid fault ride-through control system of the present invention includes a virtual synchronous generator model (VSG model), a vector limiting module, a current control module, and a PWM module connected in sequence. The input terminal of the virtual synchronous generator model is connected to the Q-U control module and the P-f control module. The control block diagram of the virtual synchronous generator model is as follows image 3 Shown.

[0038] Specifically, the mechanical torque T of the VSG model m It is calculated by the P-f control module, and the internal potential amplitude E is calculated by the Q-U control module. The P-f control module is described as follows:

[0039] T m =[P ref -k f (f-f...

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Abstract

The invention relates to a power grid fault ride-through control method. The method includes the following steps that: a virtual synchronous generator model is established, and the stator current amplitude of the virtual synchronous generator is detected in real time; and stator resistance in the virtual synchronous generator is adjusted according to the stator current amplitude of the virtual synchronous generator, so that the stator resistance increases as the stator current amplitude increases. According to the method of the invention, the stator resistance in the virtual synchronous generator model is dynamically adjusted according to the change of the stator current amplitude of the virtual synchronous generator, so that the stator resistance increases as the stator current amplitudeincreases, and therefore, stator short-circuit current can be effectively suppressed.

Description

Technical field [0001] The invention relates to a power grid fault ride-through control method, which belongs to the technical field of new energy power generation. Background technique [0002] The installed capacity of intermittent energy represented by photovoltaics and wind power accounts for an increasing proportion of the total installed capacity of the system, but the large and frequent random fluctuations of intermittent energy output have an impact on the active power balance of the system and affect the system's frequency modulation characteristics. Moreover, unlike the rotating electric machines of conventional power plants, the intermittent energy source connected to the grid through power electronic equipment is a non-rotating stationary element, which does not have the moment of inertia of conventional units. Its large-scale connection to the grid will make the system equivalent moment of inertia. Reduce and weaken the system's ability to cope with power fluctuation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 肖飞王林黄辉魏亚龙马贝龙凤勇
Owner XUJI GRP
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