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Wave power generation system low voltage ride through coordination control method

A low-voltage ride-through and coordinated control technology, which is applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as consumption, achieve the effects of prolonging the service life, reducing the number of switching times, and facilitating the realization of software and hardware

Active Publication Date: 2022-02-25
TIANJIN UNIV
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Problems solved by technology

Due to the limit of the rotor speed of the motor, for more serious low-voltage faults, an external unloading resistor can be used to consume excess unbalanced power on the DC side, but the excess energy is consumed in the form of heat

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  • Wave power generation system low voltage ride through coordination control method
  • Wave power generation system low voltage ride through coordination control method
  • Wave power generation system low voltage ride through coordination control method

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Embodiment Construction

[0050] The following detailed description in conjunction with the accompanying drawings will further explain the present invention, so that those skilled in the art can understand the present invention more deeply and can implement it. The examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention. scope.

[0051] Refer to my country's wind power grid-connected operation standards such as figure 1 As shown in , it is required that for the area above the grid voltage drop curve, the power generation system can maintain the grid-connected state without disconnection, and for the area below the curve, the power generation system is allowed to cut out. At the same time, it is required that the power generation system can output corresponding reactive power to the grid to help the grid voltage recover during the low voltage fault of the grid.

[0052] The described wave power grid-connected system is as figure ...

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Abstract

The invention relates to a wave power generation system low voltage ride through coordination control method, which is used for coordinating and controlling a network side controller, a machine side controller and a super capacitor energy storage device according to the power of each link during a fault period. The method comprises the following steps that the network side controller adopts voltage outer loop and current inner loop control based on power grid voltage orientation; when a low-voltage fault occurs in a power grid, a machine side controller works in a rotor energy storage mode, and a rotor rotating speed reference value is obtained by a direct-current bus voltage outer ring; when the machine side controller works in a rotor limit rotating speed mode, the rotor rotating speed reference value is set as a rotating speed limit value; the super capacitor energy storage device is controlled by a power outer ring and a current inner ring, the power outer ring is used for maintaining power balance at two ends of the direct-current bus, and the current inner ring is used for realizing rapid tracking control; and therefore, the machine side controller, the network side controller and the super capacitor energy storage device have different operation states under different conditions.

Description

technical field [0001] The invention relates to the technical field of wave power grid-connected system control, in particular to a low-voltage fault ride-through coordinated control system of a float-type permanent magnet synchronous wave power grid-connected system. Background technique [0002] Wave energy is a clean and renewable energy. With the continuous development and maturity of wave power generation technology, and the rapid development of large-scale and commercialization, the penetration rate of wave power generation systems continues to increase, and the reliability and stability of grid-connected systems are increasing. the decline. The drop of grid voltage is a common problem. The drop of grid voltage will bring a series of transient processes to the wave power generation system, which will endanger the normal operation of the system. Therefore, in the event of a grid failure, as a part of the new energy grid-connected power generation system, the low-voltag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/18H02J3/28
CPCH02J3/381H02J3/46H02J3/18H02J3/28H02J2300/20Y02E40/30
Inventor 方红伟魏秀娜张玄杰
Owner TIANJIN UNIV
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