Wind turbine generator including at least two power transmission systems connected in parallel with each other and control method therefor

Patent metadata

Field	Value
Publication number	US-10826349-B2
Application number	US-201716063199-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Oct 12, 2016
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The disclosure provides a wind turbine generator and a control method thereof. The wind turbine generator comprises at least two power transmission systems connected each other in parallel and a control system comprising an upper controller and control subsystems corresponding to the power transmission systems and comprising bottom controllers. The bottom controllers monitor operating state parameters of functional units in corresponding power transmission systems, and when determining corresponding functional units meet abnormal conditions according to operating state parameters, send operating state parameters of corresponding functional units to the upper controller; the upper controller generates operating instructions when determining faults of the corresponding functional units occur according to operating state parameters of corresponding functional units, to control power transmission systems to work according to operation instructions. The wind turbine generator is fully used, and the energy production thereof is further increased.

First claim

The invention claimed is:

1. A wind turbine generator, comprising:
at least two power transmission systems connected in parallel with each other, wherein each of the power transmission systems comprises a power generation subsystem and a power transmission subsystem, functional units of the power generation subsystem comprise generator windings and generator winding radiators, functional units of the power transmission subsystem comprise machine side switches, converters, radiators of converters, network side switches and transformer windings, the generator windings, the machine side switches, the converters, the network side switches and the transformer windings are connected in series in turn, the generator winding radiators are used for cooling the generator windings, and the radiators of converters are used for cooling the converters;
a control system, wherein the control system comprises an upper controller and control subsystems provided correspondingly to the power transmission systems, and each of the control subsystems comprise bottom controllers;
wherein the bottom controllers are used for monitoring operating state parameters of functional units in corresponding power transmission systems, and under the condition that it is determined that corresponding functional units meet preset conditions according to the operating state parameters, sending the operating state parameters of the corresponding functional units to the upper controller;
the upper controller is used for generating operation instructions under the condition that it is determined that faults of the corresponding functional units occur according to the operating state parameters of the corresponding functional units and controlling the power transmission systems to work according to the operation instructions.

2. The wind turbine generator according to claim 1 , wherein the bottom controller is arranged correspondingly to each functional unit of each of the power transmission systems, one end of the bottom controller is connected to the corresponding functional unit, and another end of the bottom controller is connected to the upper controller.

3. The wind turbine generator according to claim 2 , wherein the bottom controllers comprises: a central control module of the converter, a switch control module, a radiator control module of the generator winding and a radiator control module of the converter.

4. The wind turbine generator according to claim 3 , wherein,
the central control module of the converter comprises: a rectifier control sub-module and an inverter control sub-module;
the rectifier control sub-module is used for controlling working state of a rectifier module of the converter in the power transmission system and monitoring operating state parameters of the rectifier module;
the inverter control sub-module is used for controlling working state of an inverter module of the converter in the power transmission system and monitoring operating state parameters of the inverter module.

5. The wind turbine generator according to claim 3 , wherein
the switch control module is used for controlling working state of the machine side switches and the network side switches.

6. The wind turbine generator according to claim 3 , wherein the upper controller, the switch control module, the radiator control module of the generator winding and the radiator control module of the converter are provided in a main control cabinet;
the central control module of the converter is provided in the converter.

7. The wind turbine generator according to claim 3 , wherein the upper controller further comprises:
a fault type determination unit, used for determining whether faults of the corresponding functional units occur according to the operating state parameters of the corresponding functional units, and if the faults occur, determining types of the faults;
an operation mode determination unit, used for determining an operation mode of the faulty power transmission system according to corresponding relations between pre-stored fault types and operation modes;
an operation instruction generation unit, used for generating operation instructions according to the operation mode.

8. The wind turbine generator according to claim 7 , wherein the operation instruction generation unit comprises: a first operation instruction generation module, a second operation instruction generation module and a third operation instruction generation module,
wherein in a case where the operation mode is an online automatic removing mode, the first operation instruction generation module is used for generating a removing instruction in a state where an operation of the wind turbine generator is not stopped;
in a case where the operation mode is an offline automatic removing mode, the second operation instruction generation module is used for controlling the wind turbine generator to stop operation, determining whether the stopped operation is restarted, and generating a removing instruction in a case where the stopped operation is restarted; and
in a case where the operation mode is a passive removing mode, the third operation instruction generation module is used for determining whether a removing enable signal is received, and generating a removing instruction according to the removing enable signal in a case where the removing enable signal is received.

9. The wind turbine generator according to claim 7 , wherein the upper controller further comprises:
a removal control unit of a faulty power transmission system, used for controlling the faulty power transmission system to stop working according to the removing instruction and be removed from the wind turbine generator.

10. The wind turbine generator according to claim 9 , wherein the upper controller further comprises:
a deployed control parameter calculation unit, used for calculating deployed control parameters in a non-faulty power transmission system; and
a control unit of a non-faulty power transmission system, used for controlling an operation state of the non-faulty power transmission system according to the deployed control parameters.

11. The wind turbine generator according to claim 10 , wherein the deployed control parameters are deployed control parameters of harmonic currents;
correspondingly, the deployed control parameter calculation unit is further used for calculating the deployed control parameters of the harmonic currents according to circulation currents generated by the generator winding under the operation of the non-faulty power transmission system;
the control unit of the non-faulty power transmission system is further used for controlling the inverter module of the converter in the non-faulty power transmission system to inject the harmonic currents to eliminate the circulation currents according to the deployed control parameters of the harmonic currents; and
the deployed control parameters of the harmonic currents comprise: an amplitude, a phase, and a frequency.

12. A control method of a wind turbine generator, wherein the wind turbine generator comprises: at least two power transmission systems connected in parallel with each other, wherein each of the power transmission systems comprises a power generation subsystem and a power transmission subsystem, functional units of the power generation subsystem comprise generator windings and generator winding radiators, functional units of the power transmission subsystem comprise machine side switches, converters, radiators of converters, network side switches and transformer windings, the generator windings, the machine side switches, the converters, the network side switches and the transformer wind

Assignees

• Beijing Goldwind Science & Creation Windpower Equipment Co Ltd

Inventors

• Zhu Haifei
• Niu Pei
• Deng Gang
• Zhang Xiaohe

Classifications

• H02J2101/28

  Wind energy · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• F05B2260/80

  Diagnostics · CPC title

• F05B2270/502

  electrical means, e.g. relays or switches · CPC title

• F05B2270/404

  active, predictive, or anticipative · CPC title