Backup power supply and wind power generation device

Abstract

The utility model discloses a backup power supply and wind power generation device, including power supply device, first transformer and second transformer, power supply device respectively through first switch and second switch electric connection first transformer and second transformer's input terminal, the secondary winding of first transformer and second transformer is connected wind generating set. When the power grid of the wind driven generator is powered off and the typhoon-resisting requirement is triggered, the first switch is switched on, and power is supplied to the wind driven generator set at high power through the first transformer with the capacity matched with the maximum required power required by typhoon-resisting of the wind driven generator set so as to maintain the variable pitch or yaw action of the wind driven generator set. After pitch changing or yawing is completed, the first switch is switched off, the second switch is switched on, and power is supplied to the wind generating set with small power through the second transformer with the capacity matched with the standby power of the wind generating set, so that the loss of the backup power source is reduced, and the battery capacity of the backup power source is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit devices or systems for power supply or power distribution requiring the starting of a prime mover, in particular to a backup power supply and a wind power generation device. Background Art

[0002] When a wind turbine is performing typhoon mitigation maneuvers, such as pitch adjustment or yaw, it requires a high power supply. When not in typhoon mitigation mode, the turbine is in standby mode, requiring very little power. During a typhoon, the turbine's non-typhoon mitigation time can exceed 95%. Since the power consumption difference between these two operating conditions can be hundreds of times greater, a dual-circuit power supply design can reduce backup power supply losses, conserve backup battery capacity, and lower backup power supply costs.

[0003] During the entire typhoon-resistant period, when the wind turbine executes yaw or pitch control commands, the required power supply power is relatively high, but the duration is short. When there is no yaw or pitch control action, it only needs to maintain the unit control system in standby mode. This standby power is very low, but the duration is very long. In other words, during the entire typhoon-resistant period, the required power supply power is equivalent to being in a two-level differentiation state, resulting in non-negligible loss of the backup power transformer in standby mode. Figure 1 As shown in the figure, the conventional backup power supply currently only provides one power supply channel, and the internal transformer of the backup power supply is designed according to the maximum power of yaw or pitch. When the unit is in the above-mentioned standby condition, transformer T1 is almost in a no-load state, resulting in low transformer efficiency and a high loss ratio. Utility Model Content

[0004] In response to the shortcomings of the existing technology, this utility model proposes a backup power supply and a wind power generation device, which can reduce the operating loss of the backup power supply of the wind turbine generator set. The specific technical solution is as follows:

[0005] In a first aspect, a backup power supply is provided. In a first possible implementation of the first aspect, the backup power supply includes:

[0006] Power supply device;

[0007] a first transformer, wherein the primary winding is electrically connected to the power supply device via a first switch, and the transformer capacity matches the maximum required power for yaw or pitch control of the wind turbine;

[0008] The second transformer has a primary winding electrically connected to the power supply device via a second switch, and the transformer capacity matches the standby power of the wind turbine generator set.

[0009] In combination with the first possible implementation method of the first aspect, in the second possible implementation method of the first aspect, the power supply device includes a power supply, a high-voltage box and an energy storage converter, and the power supply, high-voltage box and energy storage converter are connected in sequence, and the AC side of the energy storage converter is electrically connected to the primary winding of the first transformer and the second transformer through the first switch and the second switch respectively.

[0010] In the second aspect, a wind power generation device is provided. In a first possible implementation method of the second aspect, it includes a wind turbine generator set and a backup power supply. The secondary windings of the first transformer and the second transformer are electrically connected to the typhoon resistance power supply circuit and the control system power supply circuit of the wind turbine generator set through a switching circuit.

[0011] In combination with the first implementable manner of the second aspect, in a second implementable manner of the second aspect, the switching circuit includes a first contactor and a second contactor;

[0012] a first contactor, a normally open switch connected in series between the control system power supply circuit and the secondary winding of the first transformer, and a normally closed switch connected in series between the secondary winding of the second transformer and the coil of the second contactor;

[0013] The second contactor, the normally open switch is connected in series between the secondary winding of the second transformer and the control system power supply circuit, and the normally closed switch is connected in series between the secondary winding of the first transformer and the coil of the first contactor.

[0014] In combination with the first feasible method of the second aspect, in the third feasible method of the second aspect, it also includes a first circuit breaker and a second circuit breaker, and the secondary windings of the first transformer and the second transformer are connected to the switching circuit via the first circuit breaker and the second circuit breaker respectively, and the anti-typhoon action power supply circuit and the control system power supply circuit are connected through the switching circuit.

[0015] Beneficial effects: By adopting the backup power supply and wind power generation device of the present invention, the backup power supply can provide power to the wind turbine when the power grid of the wind turbine is cut off, so as to maintain the normal operation of the wind turbine. When the wind turbine needs to yaw or change pitch, the first switch is closed and the second switch is disconnected at the same time. The power supply device can supply power to the wind turbine through the first transformer whose capacity matches the maximum required power of the wind turbine for yaw or change pitch, so as to maintain the yaw or change pitch of the wind turbine with a larger power. When the pitch or yaw of the wind turbine is completed, the first switch can be disconnected and the second switch can be closed. The power supply device can supply power to the wind turbine through the second transformer whose capacity matches the standby power of the wind turbine, so as to maintain the standby power of the wind turbine with a very small power, thereby reducing the power supply and operation loss of the backup power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 The principle topology diagram of the backup power supply of the existing wind turbine generator set;

[0018] Figure 2 A schematic diagram of the backup power supply provided in accordance with an embodiment of the present invention;

[0019] Figure 3 A schematic topology diagram of a wind power generation device according to an embodiment of the present invention;

[0020] Figure 4 This is a circuit schematic diagram of a switching circuit provided in one embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0022] like Figure 2 The backup power supply shown in the figure is a schematic topology diagram. The backup power supply includes:

[0023] Power supply device;

[0024] A first transformer T2, whose primary winding is electrically connected to the power supply device via a first switch K2, and whose capacity matches the maximum power required for yaw or pitch control of the wind turbine;

[0025] The primary winding of the second transformer T3 is electrically connected to the power supply device via the second switch K3, and the transformer capacity matches the standby power of the wind turbine generator set.

[0026] Specifically, the backup power supply includes a power supply device, a first transformer T2, and a second transformer T3. The power supply device serves as power source G1, providing external power. The power supply device is electrically connected to the input terminals (i.e., the primary windings) of the first and second transformers T2 and T3 via first and second switches K2 and K3, respectively. The secondary windings of the first and second transformers T2 and T3 are connected to the wind turbine generator set.

[0027] When the wind turbine's grid loses power and a typhoon mitigation requirement is triggered, the first switch K2 closes and the second switch K3 opens, allowing the power supply to the wind turbine via the first transformer T2. Because the capacity of the first transformer T2 matches the wind turbine's maximum typhoon mitigation power requirement, sufficient power is provided to the wind turbine via the first transformer T2 to maintain pitch or yaw control.

[0028] After the wind turbine completes pitch or yaw control, the first switch K2 can be opened and the second switch K3 closed. The power supply device then supplies power to the wind turbine via the second transformer T3. Because the capacity of the second transformer T3 matches the standby power of the wind turbine, the second transformer T3 can supply power to the wind turbine at a lower power level to maintain the wind turbine in standby mode. This reduces backup power loss and conserves battery capacity.

[0029] In this embodiment, optionally, the power supply device includes a power supply G1, a high-voltage box G2 and an energy storage converter G3, and the power supply G1, the high-voltage box G2 and the energy storage converter G3 are connected in sequence, and the AC side of the energy storage converter G3 is electrically connected to the primary windings of the first transformer T2 and the second transformer T3 through the first switch K2 and the second switch K3 respectively.

[0030] Specifically, the power supply device includes a power supply G1, a high-voltage box G2, and an energy storage converter G3. Power supply G1 can be an existing energy storage battery. The high-voltage box protects the battery circuit. For example, in the event of a battery short circuit, it promptly disconnects the battery from the energy storage converter to prevent further damage. The energy storage converter performs rectification during battery charging and inversion during battery discharge, converting the battery's direct current (DC) power into the grid's alternating current (AC). The high-voltage box and energy storage converter are selected based on the parameters of the energy storage battery.

[0031] like Figure 3 The principle topology diagram of the wind power generation device shown in the figure includes a wind turbine generator set and the above-mentioned backup power supply. The secondary windings of the first transformer T2 and the second transformer T3 are electrically connected to the typhoon resistance power supply circuit and the control system power supply circuit of the wind turbine generator set through a switching circuit.

[0032] Specifically, when the wind turbine's grid loses power and a typhoon mitigation requirement is triggered, the first switch K2 closes and the second switch K3 opens. Simultaneously, the switching circuit electrically connects the secondary winding of the first transformer T2 to the typhoon mitigation power supply circuit and the control system power supply circuit. This allows the backup power supply to supply power to the wind turbine. Because the capacity of the first transformer T2 matches the wind turbine's maximum typhoon mitigation power requirement, sufficient power is provided to the wind turbine via the first transformer T2 to maintain pitch or yaw operations.

[0033] After the wind turbine completes pitch or yaw control, the first switch K2 is opened and the second switch K3 is closed. Simultaneously, the switching circuit connects the secondary winding of the second transformer T3 to the control system power supply circuit. The power supply device then supplies power to the wind turbine via the second transformer T3. Because the capacity of the second transformer T3 matches the standby power of the wind turbine, the second transformer T3 can supply power to the wind turbine at a lower power level to maintain the wind turbine in standby mode. This reduces backup power supply losses and conserves battery capacity.

[0034] In this embodiment, optionally, the switching circuit includes a first contactor K4 and a second contactor K5;

[0035] The first contactor K4, a normally open switch is connected in series between the control system power supply circuit and the secondary winding of the first transformer T2, and the normally closed switch is connected in series between the secondary winding of the second transformer T3 and the coil of the second contactor K5;

[0036] The second contactor K5, a normally open switch is connected in series between the secondary winding of the second transformer T3 and the control system power supply circuit, and a normally closed switch is connected in series between the secondary winding of the first transformer T2 and the coil of the first contactor K4.

[0037] Specifically, if Figure 4 As shown, the secondary winding of the first transformer T2 is directly connected to the typhoon mitigation power supply circuit. When the wind turbine's grid loses power and a typhoon mitigation requirement is triggered, the first switch K2 is closed and the second switch K3 is opened. The coil of the first contactor K4 is energized, closing the normally open switch and opening the normally closed switch. The control system power supply circuit and the typhoon mitigation power supply circuit are then connected in parallel to the secondary winding of the first transformer T2. Power is simultaneously supplied to the wind turbine's control system power supply circuit and the typhoon mitigation power supply circuit via the first transformer T2 to maintain the wind turbine's pitch or yaw operation.

[0038] When the yaw or pitch change action of the wind turbine generator set is completed, after a delay, the first switch K2 is opened and the second switch K3 is closed. At this time, the first contactor K4 is powered off, and its normally closed switch is closed. The second contactor K5 can be powered on, so that the normally open switch of the second contactor K5 is closed and the normally closed switch is opened. The control system power supply circuit can be connected to the secondary winding of the second transformer T3, and power can be supplied to the control system power supply circuit of the wind turbine generator set through the second transformer T3 to maintain the wind turbine generator set in standby mode.

[0039] In this embodiment, optionally, a first circuit breaker S5 and a second circuit breaker S6 are further included, and the secondary windings of the first transformer T2 and the second transformer T3 are connected to the switching circuit via the first circuit breaker S5 and the second circuit breaker S6 respectively, and the anti-typhoon action power supply circuit and the control system power supply circuit are connected through the switching circuit.

[0040] Specifically, a first circuit breaker S5 and a second circuit breaker S6 are connected in series between the secondary windings of the first transformer T2 and the second transformer T3 and the switching circuit. The first circuit breaker S5 can be a molded case circuit breaker, and the second circuit breaker S6 can be a miniature circuit breaker. The first circuit breaker S5 and the second circuit breaker S6 are used to protect the wind turbine's typhoon protection power supply circuit and the control system power supply circuit, respectively. This means that if a load fault occurs, the power supply circuit is promptly disconnected to prevent the accident from escalating.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A backup power supply, characterized in that: include: Power supply device; a first transformer, wherein the primary winding is electrically connected to the power supply device via a first switch, and the transformer capacity matches the maximum required power for yaw or pitch control of the wind turbine; The second transformer has a primary winding electrically connected to the power supply device via a second switch, and the transformer capacity matches the standby power of the wind turbine generator set.

2. The backup power supply according to claim 1, characterized in that: The power supply device includes a power supply, a high-voltage box and an energy storage converter, which are connected in sequence, and the AC side of the energy storage converter is electrically connected to the primary windings of the first transformer and the second transformer via the first switch and the second switch respectively.

3. A wind power generation device, comprising a wind turbine generator set, characterized in that: It also includes the backup power supply as described in claim 1 or 2, and the secondary windings of the first transformer and the second transformer are electrically connected to the typhoon resistance power supply circuit and the control system power supply circuit of the wind turbine generator set through a switching circuit.

4. The wind power generation device according to claim 3, characterized in that: The switching circuit includes a first contactor and a second contactor; a first contactor, a normally open switch connected in series between the control system power supply circuit and the secondary winding of the first transformer, and a normally closed switch connected in series between the secondary winding of the second transformer and the coil of the second contactor; The second contactor, the normally open switch is connected in series between the secondary winding of the second transformer and the control system power supply circuit, and the normally closed switch is connected in series between the secondary winding of the first transformer and the coil of the first contactor.

5. The wind power generation device according to claim 3, characterized in that: It also includes a first circuit breaker and a second circuit breaker. The secondary windings of the first transformer and the second transformer are connected to the switching circuit via the first circuit breaker and the second circuit breaker respectively, and the anti-typhoon action power supply circuit and the control system power supply circuit are connected through the switching circuit.

Images