Variable pitch system protection system and method in wind generating set power grid phase-loss fault

A technology for wind turbines and pitch control systems, applied in wind turbines, control of wind turbines, wind power generation, etc., can solve problems such as load overload, potential safety hazards, and unit overspeed, so as to solve the problem of untimely retraction of propellers and improve safety Effect

Active Publication Date: 2021-04-02
CRRC WIND POWER(SHANDONG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Restricted by the fact that most of the pitch system drivers are imported brands, it is difficult for customers to change the underlying program, the external power supply is uncontrollable and the internal control logic and other factors, the pitch system of the currently running unit, the grid voltage phase loss fault, the voltage short When the time rises to a high level (≥1.3pu), the bus voltage of the driver will exceed the protection limit after being rectified by the uncontrollable rectifier

Method used

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  • Variable pitch system protection system and method in wind generating set power grid phase-loss fault
  • Variable pitch system protection system and method in wind generating set power grid phase-loss fault
  • Variable pitch system protection system and method in wind generating set power grid phase-loss fault

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Embodiment 1

[0034] This embodiment provides a protection system for the pitch system in the case of a phase loss fault in the power grid of a wind power generating set, such as image 3 with Figure 4 As shown, including circuit breaker 1QF1, filter reactor 3L1, three-phase rectifier bridge VD1, driver 3U1, filter reactor 3L1 is connected to driver 3U1 through three-phase rectifier bridge (uncontrollable three-phase rectifier bridge) VD1, driver 3U1 and pitch motor M connected.

[0035] In this embodiment, a contactor 1KM1 is added between the circuit breaker 1QF1 and the filter reactor 3L1, and the state of the contactor 1KM1 is controlled by the auxiliary contact of the intermediate relay 14K1 powered by the newly added switching power supply 6U1. The intermediate relay 14K1 is connected to the driver 3U1, and the driver 3U1 can determine the input or output signal according to whether the DC bus voltage exceeds the limit, so as to control the main power supply of the whole system.

...

Embodiment 2

[0039] This embodiment provides a method for protecting the pitch system during a phase loss fault of the power grid of a wind power generating set, using the protection system described in Embodiment 1, such as Figure 5 shown, including:

[0040] Such as figure 1 As shown, when the voltage of the grid voltage rises suddenly due to phase loss or other reasons, the three-phase unbalance or overvoltage, etc., the pitch system is rectified by the uncontrollable three-phase rectifier bridge VD1, causing the driver 3U1 bus voltage to exceed the limit value ( ≥1.38pu), such as Image 6 As shown in , the drive reports a high bus voltage fault, the drive self-protection is blocked, and the propeller retraction action is no longer performed. If the limit value is not exceeded, use the main power supply of the pitch system to complete the retraction.

[0041] In this embodiment, by adding the Do output signal and the overvoltage fault self-reset function of the driver's DC bus, the ...

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Abstract

The invention discloses a variable pitch system protection system and method in a wind generating set power grid phase-loss fault. According to the technical scheme, the variable pitch system protection system comprises a circuit breaker and a filter reactor, wherein a contactor is additionally arranged between the circuit breaker and the filter reactor, a state of the contactor is controlled by an auxiliary contact of an intermediate relay powered by a switching power supply, the intermediate relay is connected to a driver, and the driver can determine signal input or output according to whether a voltage of a direct-current bus exceeds the limit or not. According to the system, hidden dangers such as overspeed and overloading caused by a variable pitch system during power grid voltage phase loss can be eliminated, and the safety performance and the automation degree of a set are improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a protection system and method for a pitch system during a phase loss fault of a power grid of a wind power generating set. Background technique [0002] With the rapid development of the wind power industry, the installed scale and unit capacity are increasing, and it is particularly important to simultaneously improve the safety performance and automation of the unit. As an important part of the protection function of the wind turbine, the pitch control system is a necessary condition for the long-term stable operation of the equipment to complete the pitch change action in a timely and effective manner when the unit triggers a fault. [0003] Restricted by the fact that most of the pitch system drivers are imported brands, it is difficult for customers to change the underlying program, the external power supply is uncontrollable and the internal control logic and other fac...

Claims

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Application Information

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IPC IPC(8): F03D7/00H02J9/06H02H3/253
CPCF03D7/00H02J9/06H02H3/253F05B2270/328F05B2270/337Y02E10/72Y02E10/76Y02B10/70
Inventor 王成贤狄振锋隗嘉周彭
Owner CRRC WIND POWER(SHANDONG) CO LTD
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