CN219123981U

CN219123981U - Standby power supply system of wind generating set and wind generating set

Info

Publication number: CN219123981U
Application number: CN202320136057.9U
Authority: CN
Inventors: 刘婉妮; 王猛; 高保峰
Original assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Current assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-06-02
Anticipated expiration: 2033-01-13

Abstract

A standby power supply system of a wind generating set and the wind generating set are disclosed. The backup power supply system includes: the wind power generation system comprises an energy storage battery, an AC/DC converter, a DC/DC converter and a first converter, wherein the input end of the AC/DC converter is connected to the output end of the wind generating set, the output end of the AC/DC converter is connected to the input end of the DC/DC converter, the energy storage battery is connected to the output end of the DC/DC converter and the direct current end of the first converter, and the alternating current end of the first converter is connected to the load of the wind generating set. According to the standby power supply system and the wind generating set, long-time power supply of the wind generating set can be realized, and the wind generating set can be started through the standby power supply system under proper working conditions, so that the load is reduced, and the safety is improved.

Description

Standby power supply system of wind generating set and wind generating set

Technical Field

The present disclosure relates generally to the field of wind power generation technology, and more particularly, to a backup power system of a wind power generator set and a wind power generator set.

Background

With the development of technology and the improvement of global ecological protection consciousness, wind energy is increasingly valued by all countries in the world as a clean renewable energy source with high content. With the development of wind power generation technology, wind power generation units are increasingly used, and the use of the wind power generation units is gradually shifted from traditional land installation to offshore installation. At present, the operation of the wind generating set depends on the power supply of an external power grid, and under some special scenes, the situation that the external power grid cannot supply power to the wind generating set can occur, for example, a power supply cable is not laid yet or the power grid cannot be maintained and restored in a short time, and the like, the wind generating set is stopped, so that the safety of the wind generating set is endangered.

To cope with these special conditions, wind power plants are often equipped with backup power sources, such as diesel generators, UPS, super capacitors, etc. However, the existing standby power supply has high cost and requires operation staff to perform the oiling operation at random, which increases the working frequency of the operation staff, thus significantly increasing the maintenance cost. In addition, existing backup power supplies have limited stored energy and, under extreme conditions, cannot maintain long-term operation of various electrical devices of the wind turbine and minimum control systems of the wind turbine (e.g., without limitation, various controllers and sensors that maintain proper operation of the wind turbine). In addition, for offshore wind generating sets, the existing standby power supply cannot provide enough energy for the engine room to heat, dehumidify and the like, so that key device faults can occur when the engine is restarted, and the starting time is long.

Disclosure of Invention

In view of the above, the present utility model provides a backup power system of a wind turbine generator system and a wind turbine generator system that do not depend on an external power grid and can be charged with breeze, so as to stably and effectively supply power to the wind turbine generator system for a long time, so as to improve the safety, reliability and viability of the wind turbine generator system.

In one general aspect, there is provided a backup power system for a wind turbine generator set, the backup power system comprising: the wind power generation system comprises an energy storage battery, an AC/DC converter, a DC/DC converter and a first converter, wherein the input end of the AC/DC converter is connected to the output end of the wind generating set, the output end of the AC/DC converter is connected to the input end of the DC/DC converter, the energy storage battery is connected to the output end of the DC/DC converter and the direct current end of the first converter, and the alternating current end of the first converter is connected to the load of the wind generating set.

Optionally, when the wind generating set is operated, an output end of the wind generating set charges the energy storage battery via the AC/DC converter and the DC/DC converter.

Optionally, when the wind power generator set is disconnected from an external power grid and the wind power generator set is shut down, the energy storage battery supplies power to a load of the wind power generator set via the first converter.

Optionally, the first converter is a bidirectional converter.

Optionally, the standby power system further includes: and the first switch is arranged between the alternating-current end of the first converter and the low-voltage side of the auxiliary transformer of the wind generating set.

Optionally, when the wind power plant remains connected to an external grid, the first switch is closed and the low voltage side of the auxiliary transformer of the wind power plant charges the energy storage battery via the first converter.

Optionally, when the wind generating set is disconnected from an external grid and is operating in a breeze condition, the first switch is opened and the output of the generator charges the energy storage battery via the AC/DC converter and the DC/DC converter.

Optionally, when the wind power plant is disconnected from an external grid and the wind power plant is shut down, the first switch is opened and the energy storage battery supplies power to a load of the wind power plant via the first converter.

Optionally, the DC/DC converter is a boost DC/DC converter.

In another general aspect, a wind power plant is provided, comprising a backup power system for a wind power plant as described above.

According to the standby power supply system of the wind generating set and the wind generating set, the energy storage battery of the standby power supply system can be charged by utilizing the output electric energy of the wind generating set under the condition of breeze without depending on an external power grid, and can be charged by utilizing the electric energy of the power grid under the condition that the power grid is normal, so that the standby power supply system can supply power for the wind generating set for a long time. On the other hand, according to the standby power supply system of the wind generating set and the wind generating set, the wind generating set can be started through the standby power supply system, the fan load is reduced, the safety of the fan is improved, and the self-sustaining operation of the wind generating set in the island mode can be realized.

Drawings

The foregoing and other objects and features of embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings in which the embodiments are shown, in which:

FIG. 1 is a block diagram illustrating a backup power system of a wind turbine according to a first embodiment of the present disclosure;

FIG. 2 is a block diagram illustrating a backup power system of a wind turbine according to a second embodiment of the present disclosure;

FIG. 3 is a circuit topology diagram illustrating a backup power system of a wind turbine generator system in accordance with an embodiment of the present disclosure.

Reference numerals illustrate:

100: a backup power supply system; 110: an energy storage battery; 120: an AC/DC converter; 130: a DC/DC converter; 140: a first inverter; 150: a load; 200: a backup power supply system; 210: an energy storage battery; 220: an AC/DC converter; 230: a DC/DC converter; 240: a first inverter; 245: a first switch; 250: a load; 260: an auxiliary transformer; 300: a backup power supply system; 310: an energy storage battery; 320: an AC/DC converter; 330: a DC/DC converter; 340: a first inverter; 345: a first switch; 350: a load; 360: an auxiliary transformer; 370: a wind power generator set; 380: a current transformer; 390: an external power grid; u1: a network side converter; u2: a machine side converter; q1: a network side switch; q2: a machine side switch; t1: a box transformer; q0: and (3) a switch.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of the present application. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the present application, except for operations that must occur in a particular order. Furthermore, descriptions of features known in the art may be omitted for clarity and conciseness.

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the utility model, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after an understanding of the present disclosure.

As used herein, the term "and/or" includes any one of the listed items associated as well as any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in the examples described herein may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

In the description, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" or "coupled to" the other element, it can be directly "on" the other element, be directly "connected to" or be "coupled to" the other element, or one or more other elements intervening elements may be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" or "directly coupled to" another element, there may be no other element intervening elements present.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or combinations thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. Unless explicitly so defined herein, terms (such as those defined in a general dictionary) should be construed to have meanings consistent with their meanings in the context of the relevant art and the present utility model and should not be interpreted idealized or overly formal.

In addition, in the description of the examples, when it is considered that detailed descriptions of well-known related structures or functions will cause ambiguous explanations of the present utility model, such detailed descriptions will be omitted.

In order to enable one skilled in the art to utilize the teachings of the present utility model, the following exemplary embodiments are presented in terms of particular application scenarios, particular system, device and component parameters and particular manner of connection. However, it will be apparent to those having ordinary skill in the art that these embodiments are merely examples, and that the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the utility model.

FIG. 1 is a block diagram illustrating a backup power system of a wind turbine generator system according to an embodiment of the present disclosure.

Referring to fig. 1, a backup power system 100 of a wind turbine generator includes an energy storage battery 110, an AC/DC converter 120, a DC/DC converter 130, and a first converter 140. The input of the AC/DC converter 120 is connected to the output of the wind park (e.g. the output of a generator of the wind park), the output of the AC/DC converter 120 is connected to the input of the DC/DC converter 130, the energy storage battery 110 is connected to the output of the DC/DC converter 130 and to the DC-side of the first converter 140, and the AC-side of the first converter 140 is connected to the load 150 of the wind park. The first converter 140 may be a DC/AC converter (inverter) or a bi-directional converter. The following description will take an example in which the first converter 140 is a DC/AC converter (inverter).

When the wind turbine is operating (including normal operation and start-up operation in light wind conditions), the output of the wind turbine may charge the energy storage battery 110 via the AC/DC converter 120 and the DC/DC converter 130. Specifically, the AC/DC converter 120 as a three-phase rectifier may rectify three-phase AC power output from the wind generating set into DC power, and the DC/DC converter 130 as a boost converter may convert the rectified DC power into DC power suitable for charging the energy storage battery 110, thereby achieving charging of the energy storage battery 110. Here, the type of energy storage battery may be configured according to the power requirements of the wind turbine generator set, including, but not limited to, lithium iron phosphate batteries, lithium batteries, lead acid batteries, lead carbon batteries, and the like.

On the other hand, when the wind power generator set is disconnected from the external power grid and the wind power generator set is shut down, the energy storage battery 110 may supply power to the load 150 of the wind power generator set via the first converter 140. Specifically, the first inverter 140 may convert the direct current output from the energy storage battery 110 into three-phase alternating current to power the load 150 of the wind turbine generator set. Here, the load 150 of the wind power generation set may include various electrical devices provided in the wind power generation set. By utilizing the energy storage battery 110 to load 150 of the wind generating set, the wind generating set can be ensured to be started automatically under the working condition suitable for starting, so that the fan load is reduced, and the self-sustaining operation of the wind generating set in the island mode can be realized. Alternatively, the wind turbine generator set outputs alternating current when disconnected from the external power grid and operating in a breeze condition. In this case, the three-phase AC power output from the wind turbine generator may be rectified by the AC/DC converter 120 and boosted by the DC/DC converter 130 to charge the energy storage battery 110.

According to embodiments of the present disclosure, when the electrical energy charged into the energy storage battery 110 reaches a preset threshold (e.g., without limitation, when the energy storage battery 110 is full), the charging of the energy storage battery 110 via the AC/DC converter 120 and the DC/DC converter 130 may be stopped. At this time, the AC/DC converter 120 and the DC/DC converter 130 may stop operating. On the other hand, when the energy storage battery 110 is fully charged for a long period of time, the energy storage battery 110 may be discharged according to characteristics of the energy storage battery 110. Here, various discharging methods may be employed to discharge the energy storage battery 110, which the present disclosure does not impose any limitation.

Optionally, the backup power system 100 of the wind turbine generator set may also include a controller (not shown). The controller may monitor the operational status of the wind turbine generator set and the status of the external power grid. When it is monitored that the external power grid is normal, the controller may control the AC/DC converter 120 and the DC/DC converter 130 to be put into operation so as to charge the energy storage battery 110, and when it is monitored that the electric power of the energy storage battery 110 reaches a preset threshold value, control the AC/DC converter 120 and the DC/DC converter 130 to stop operation. On the other hand, when an external grid loss is detected and the wind turbine is shut down, the controller may control the first converter 140 to start operating so that the energy storage battery 110 supplies power to the load 150. In addition, when it is monitored that the external grid is powered down and the wind turbine is operating in a breeze condition, the controller may control the AC/DC converter 120 and the DC/DC converter 130 to be put into operation in order to charge the energy storage battery 110.

FIG. 2 is a block diagram of a backup power system of a wind turbine according to another embodiment of the present disclosure.

Referring to fig. 2, a backup power system 200 of a wind turbine includes an energy storage battery 210, an AC/DC converter 220, a DC/DC converter 230, a first converter 240, and a first switch 245. The connection of the energy storage battery 210, the AC/DC converter 220, the DC/DC converter 230, and the first converter 240 is the same as the connection of the energy storage battery 110, the AC/DC converter 120, the DC/DC converter 130, and the first converter 140 shown in fig. 1, and a repetitive description thereof will be omitted. As described above, the first converter 240 may be a DC/AC converter (inverter) or a bidirectional converter. The first converter 140 is described herein as an example of a bi-directional converter. The first switch 245 is arranged between the ac side of the first converter 240 and the low voltage side of the auxiliary transformer 260 of the wind park.

When the wind park remains connected to the external grid, the first switch 245 is closed. In this way, the low voltage side of the auxiliary transformer 260 of the wind power plant may charge the energy storage battery 210 via the first converter 240. Specifically, when the output power of the wind generating set is higher than the grid-connected power, the output voltage of the wind generating set may be transformed by the auxiliary transformer 260, and the output voltage of the low-voltage side of the auxiliary transformer 260 may charge the energy storage battery 210 via the first inverter 240. In this case, the AC/DC converter 220 and the DC/DC converter 230 may stop operating. At the same time, the output voltage of the low side of auxiliary transformer 260 may also power load 250 of the wind turbine. On the other hand, when the output power of the wind power generation set is lower than or equal to the grid-connected power (e.g., when the wind power generation set is shut down due to an excessively low wind speed), the grid voltage may be transformed by the auxiliary transformer 260, and the output voltage of the low-voltage side of the auxiliary transformer 260 may charge the energy storage battery 210 via the first inverter 240. In this case, the AC/DC converter 220 and the DC/DC converter 230 may also stop operating. At the same time, the output voltage of the low side of auxiliary transformer 260 may also power load 250 of the wind turbine.

When the wind generating set is disconnected from the external power grid and is operating in a breeze condition, the first switch 245 is opened. In this way, the output of the wind park may charge the energy storage battery 210 via the AC/DC converter 220 and the DC/DC converter 230. As described above, the AC/DC converter 220 as a three-phase rectifier may rectify three-phase alternating current output from the wind generating set into direct current, and the DC/DC converter 230 as a boost type DC/DC converter may convert the rectified direct current into direct current suitable for charging the energy storage battery 210, thereby achieving charging of the energy storage battery 210.

When the wind power unit is disconnected from the external power grid and the wind power unit is shut down, the first switch 245 is opened. At this time, the energy storage battery 210 may supply power to the load 250 of the wind turbine via the first inverter 240. As described above, the first inverter 240 may convert the direct current output from the energy storage battery 210 into three-phase alternating current to power the load 250 of the wind turbine generator set.

According to embodiments of the present disclosure, when the electrical energy charged into the energy storage battery 210 reaches a preset threshold (e.g., without limitation, when the energy storage battery 210 is full), the charging of the energy storage battery 110 via the AC/DC converter 220 and the DC/DC converter 230 may be stopped, or the low voltage side of the auxiliary transformer 260 of the wind turbine generator set may be stopped from charging the energy storage battery 210 via the first converter 240. In this case, the AC/DC converter 220 and the DC/DC converter 230 may stop operating, or the first converter 240 may stop operating. On the other hand, when the energy storage battery 210 is fully charged for a long period of time, the energy storage battery 210 may be discharged according to characteristics of the energy storage battery 210. Here, various discharging methods may be employed to discharge the energy storage battery 210, which the present disclosure does not impose any limitation.

Optionally, the backup power system 200 of the wind turbine generator set may also include a controller (not shown). The controller may monitor the operational status of the wind turbine generator set and the status of the external power grid. When it is monitored that the wind turbine generator system remains connected to the external power grid, the controller may close the first switch 245 and control the first inverter 240 to be put into operation so as to charge the energy storage battery 110, and when it is monitored that the electric energy of the energy storage battery 110 reaches a preset threshold value, control the first inverter 240 to stop operation. On the other hand, when an external grid loss is detected and the wind turbine generator system is shut down, the controller may control the first switch 245 to open and control the first inverter 240 to be put into operation so that the energy storage battery 210 supplies power to the load 250. In addition, when it is monitored that the external power grid is powered down and the wind turbine generator is operating in a breeze condition, the controller may control the first switch 245 to be turned off and control the AC/DC converter 220 and the DC/DC converter 230 to be put into operation in order to charge the energy storage battery 210.

Referring to fig. 3, a backup power system 300 of a wind turbine includes an energy storage battery 310, an AC/DC converter 320, a DC/DC converter 330, a first converter 340, and a first switch 345. The standby power system 300 is identical to the standby power system 200 shown in fig. 2 in structure and configuration, and will not be described again.

As shown in fig. 3, the output of the wind turbine 370 is connected to an external power grid 390 via a converter 380 and a tank transformer (e.g., grid-connected transformer) T1. The converter 380 may include a grid-side converter (inverter) U1 and a machine-side converter (rectifier) U2, and may include a grid-side switch Q1 and a machine-side switch Q2. The current transformer 380 operates in the same manner as the existing wind power current transformer, and this disclosure does not limit this.

The input of the AC/DC converter 320 of the backup power system 300 is connected to the output of the wind power generator set 370, the AC terminal of the first converter 340 of the backup power system 300 is connected to the load 350 of the wind power generator set, one end of the first switch 345 of the backup power system 300 is connected to the AC terminal of the first converter 340, and the other end is connected to the low voltage side of the auxiliary transformer 360. The high voltage side of auxiliary transformer 360 is connected to the output of converter 380 and via switch Q0 to the low voltage side of tank T1, while the high voltage side of tank T1 is connectable to an external power grid 390. When the external power grid is normal, the switch Q0 may be closed, and when the external power grid is powered down, the switch Q0 may be opened. The auxiliary transformer T2 may be a 1140V/400V transformer, but the present disclosure is not limited thereto. The voltage on the high side of auxiliary transformer T2 may depend on the voltage at the output of converter 380 when the wind turbine is operating normally, and the voltage on the low side of auxiliary transformer T2 may depend on the power requirements of load 350. Further, the tank transformer T1 may be a 35kV/1140V transformer, but the present disclosure is not limited thereto.

According to another embodiment of the present disclosure, a wind power plant may also be provided, which may comprise a backup power system of a wind power plant as described above.

According to the standby power supply system of the wind generating set and the wind generating set, the energy storage battery of the standby power supply system can be charged by utilizing the electric energy output by the wind generating set under the condition of breeze without depending on an external power grid, and can be charged by utilizing the electric energy of the power grid under the condition that the power grid is normal, so that the standby power supply system can supply power for the wind generating set for a long time. On the other hand, according to the standby power supply system of the wind generating set and the wind generating set, the wind generating set can be started through the standby power supply system, the fan load is reduced, the safety of the fan is improved, and the self-sustaining operation of the wind generating set in the island mode can be realized.

Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A backup power system for a wind turbine generator system, the backup power system comprising: an energy storage battery, an AC/DC converter, a DC/DC converter and a first converter,

the input end of the AC/DC converter is connected to the output end of the wind generating set, the output end of the AC/DC converter is connected to the input end of the DC/DC converter, the energy storage battery is connected to the output end of the DC/DC converter and the direct current end of the first converter, and the alternating current end of the first converter is connected to the load of the wind generating set.

2. The backup power system of a wind power generator set of claim 1, wherein an output of the wind power generator set charges the energy storage battery via the AC/DC converter and the DC/DC converter when the wind power generator set is operating.

3. The backup power system of a wind power generator set of claim 1, wherein the energy storage battery supplies power to a load of the wind power generator set via the first converter when the wind power generator set is disconnected from an external power grid and the wind power generator set is shut down.

4. The backup power system of a wind turbine of claim 1, wherein the first converter is a bi-directional converter.

5. The backup power system of a wind turbine of claim 4, wherein the backup power system further comprises: and the first switch is arranged between the alternating-current end of the first converter and the low-voltage side of the auxiliary transformer of the wind generating set.

6. The backup power system of a wind power generator set as claimed in claim 5, wherein the first switch is closed and a low voltage side of an auxiliary transformer of the wind power generator set charges the energy storage battery via the first converter when the wind power generator set remains connected to an external power grid.

7. The backup power system of a wind power unit as claimed in claim 5, wherein when the wind power unit is disconnected from an external power grid and is operating in a breeze condition, the first switch is opened and the output of the wind power unit charges the energy storage battery via the AC/DC converter and the DC/DC converter.

8. The backup power system of a wind power generator set as claimed in claim 5, wherein the first switch is opened and the energy storage battery supplies power to a load of the wind power generator set via the first converter when the wind power generator set is disconnected from an external power grid and the wind power generator set is shut down.

9. The backup power system of a wind turbine of claim 1, wherein the DC/DC converter is a boost DC/DC converter.

10. A wind power plant, characterized in that the wind power plant comprises a backup power system of a wind power plant according to any of claims 1-9.