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System for improving low voltage ride-through capability of doubly-fed pumped storage unit and control method thereof

A pumped-storage unit and low-voltage ride-through technology, applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problem of inability to control the rotor side overcurrent, the inability to protect the rotor side converter, and affect the stable operation of the system, etc. problem, to achieve the effect of improving low voltage ride-through capability, suppressing rotor side overcurrent, and ensuring voltage

Inactive Publication Date: 2020-02-07
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the overcurrent on the rotor side cannot be controlled, the converter on the rotor side cannot be protected, and excessive heat generation affects the stable operation of the system

Method used

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  • System for improving low voltage ride-through capability of doubly-fed pumped storage unit and control method thereof
  • System for improving low voltage ride-through capability of doubly-fed pumped storage unit and control method thereof
  • System for improving low voltage ride-through capability of doubly-fed pumped storage unit and control method thereof

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Embodiment Construction

[0052] The following describes the implementation of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.

[0053] It should be noted that the illustrations provided in the following embodiments only illustrate the basic idea of ​​the present invention in a schematic way, so the figures only show the components related to the present invention instead of the actual implementation of the number, shape and For...

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Abstract

The invention discloses a system for improving the low voltage ride-through capability of a doubly-fed pumped storage unit and a control method thereof, and belongs to the technical field of hydropower generation. The system comprises a rotor side controller, which receives a detection signal of a grid voltage detector, adopts a stator flux linkage tracking control strategy when the grid voltage drops, and adopts a vector control strategy when the grid voltage recovers; and the system also comprises grid-side controller, which receives a detection signal of the grid voltage detector, controlsa grid-side converter to work in the working mode of a fault converter when the grid voltage drops, and adopts the working mode of a normal converter when the grid voltage recovers. The system of theinvention inhibits the damage of overcurrent and overvoltage to the unit during the grid fault, helps the grid recover and improves the low voltage ride-through capability of the doubly-fed unit.

Description

Technical field [0001] The invention relates to the field of power generation technology, and in particular to a system and a control method for improving the low voltage ride-through capability of a doubly-fed pumped storage unit. Background technique [0002] In recent years, the increase in grid-connected capacity of new energy generating units has made significant contributions to my country's energy conservation and emission reduction cause. However, due to the intermittent nature of wind and photovoltaic power generation, the requirements for peak and frequency regulation of the power grid have also been improved. Therefore, pumped storage power stations with the function of peak-shaving and valley-filling will play an increasingly important role in the power grid. [0003] At present, the new type of pumped storage units use double-fed induction motors (DFIG). Compared with traditional synchronous units, doubly-fed pumped-storage units have the following advantages: 1. Enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/38
Inventor 周美兰宋一鸣张宇吴晓刚杨洋
Owner HARBIN UNIV OF SCI & TECH
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