Dual redundant power supply system and wind turbine generator system

Abstract

The present disclosure relates to a dual-redundant power supply system and a wind turbine generator unit, the dual-redundant power supply system comprising: a main power supply; a backup power supply; a DC redundancy module having a first input port, a second input port and an output port, the first input port being connected to the backup power supply, the second input port being connected to the main power supply, the output port outputting DC voltage to power a load when any of the input ports of the redundancy module is powered; and a delay control module having a control unit and a first control switch, the control unit being connected to the main power supply, the first control switch being arranged between the backup power supply and the DC redundancy module, the control unit being configured to control the first control switch to be turned off after a predetermined time delay when the main power supply is restored, and to control the first control switch to be turned on when the main power supply is powered off. The technical solution provided by the present disclosure can realize continuous power supply for the load, reduce the use of the backup power supply, and save cost and energy.

Description

Technical Field

[0001] This disclosure relates to the technical field of power supply control, and in particular to a dual-redundant power supply system and a wind turbine generator set. Background Technology

[0002] The power grid in wind farms is unstable and may experience random power outages. In addition, there is a need to respond to random power demands such as typhoon or vortex-induced shocks. It is usually necessary to set up a backup power source in the wind turbine to provide power when the mains power fails, so as to meet the power demand of the wind turbine and ensure the safety of the wind turbine and its components.

[0003] However, the power switching modules currently used to switch between the mains power and backup power cannot guarantee a complete power outage during the switching process. During the switching process, the controller will experience a brief power outage, which will prevent it from continuously receiving and sending signals and collecting and uploading information. Furthermore, after the power is restored, it cannot quickly return to normal operation, which affects data security. Utility Model Content

[0004] The purpose of this disclosure is to provide a dual-redundant power supply system and a wind turbine generator set that can provide continuous power to the load while reducing the use of backup power, thereby reducing costs and saving energy.

[0005] According to one aspect of this disclosure, a dual-redundant power supply system is provided, comprising: a primary power supply; a backup power supply; a DC redundancy module having a first input port, a second input port, and an output port, the first input port being connected to the backup power supply, the second input port being connected to the primary power supply, and when any input port of the redundancy module is powered, the output port of the DC redundancy module outputs a DC voltage to power a load; and a delay control module having a control unit and a first control switch, the control unit being connected to the primary power supply, the first control switch being disposed between the backup power supply and the DC redundancy module, the control unit being configured to control the first control switch to open after a predetermined delay when the primary power supply is restored, and to control the first control switch to close when the primary power supply is de-energized.

[0006] The technical solution provided in this disclosure allows the main power supply and the backup power supply to supply power simultaneously by setting up a DC redundancy module. In power supply switching scenarios, it is not necessary to disconnect the power supply that is currently supplying power first, which can avoid power loss during power switching.

[0007] Furthermore, a first control switch is installed between the backup power supply and the DC redundancy module. The control unit is configured to open the first control switch after a predetermined delay when the primary power supply resumes operation, and to close the first control switch when the primary power supply fails. This ensures that the first control switch closes only when the primary power supply fails, thus prioritizing the primary power supply over the backup power supply. This allows the more expensive power supply to be used as a backup, reducing the frequency of backup power supply usage and saving costs. Simultaneously, the predetermined delay ensures that the primary power supply has the capability to supply power to the load through the DC redundancy module before disconnecting the backup power supply during the switchover. This prevents power loss during power switching when the primary power supply is disconnected because it lacks the capability to supply power to the load through the DC redundancy module.

[0008] Optionally, the main power supply is connected to the second input port via an uninterruptible power supply.

[0009] The above solution allows the output voltage to be adjusted to the voltage required by the load via the energy conversion module. Furthermore, in the event of a sudden main power supply failure, the built-in battery of the uninterruptible power supply (UPS) ensures a continuous power supply path between the main power supply and the DC redundancy module. This guarantees uninterrupted power supply to the load during the transition from the first control switch being open to closed, further preventing power outages during power switching.

[0010] Optionally, the backup power supply is also connected to the load through a first path, and the first path is connected in parallel with the DC redundancy module; one end of the first control switch is connected to the backup power supply, and the other end of the first control switch is connected to the first input port and the first path.

[0011] With the above scheme, in the event of a primary power supply failure, the first control switch closes, and the backup power supply can supply power to the load through the DC redundancy module and the first path. At this time, if the path containing the DC redundancy module fails, the backup power supply can still supply power to the load through the first path; conversely, if the first path fails, the backup power supply can still supply power to the load through the path containing the DC redundancy module. In other words, the backup power supply can supply power to the load through two paths, thus providing redundancy and ensuring a stable power supply to the load even if either path fails.

[0012] Optionally, the main power supply is also connected to the load through a second path, and the second path is connected in parallel with the DC redundancy module; the delay control module also has a second control switch, which is connected in series in the second path; the control unit is further configured to control the second control switch to close when the main power supply is restored, and to control the second control switch to open when the main power supply is de-energized; a diode is connected in series in the first path, and the anode of the diode is connected to the other end of the first control switch, and the cathode of the diode is connected to the load.

[0013] With the above scheme, when the main power supply returns to normal, the first control switch opens and the second control switch closes, allowing the main power supply to supply power to the load through the DC redundancy module and the second path. At this time, if the path containing the DC redundancy module fails, the main power supply can still supply power to the load through the second path; conversely, if the second path fails, the main power supply can still supply power to the load through the path containing the DC redundancy module. In other words, the main power supply can supply power to the load through two paths, thus providing redundancy and ensuring stable power supply to the load even if either path fails.

[0014] Optionally, the delay control module is a time relay, the control unit is the coil of the time relay, the first control switch is the normally closed contact of the time relay, and the second control switch is the normally open contact of the time relay.

[0015] The above scheme allows the opening and closing of the first and second control switches to be controlled by the energization and de-energization of the coil of the time relay, simplifying the complexity of the dual redundant power supply system and reducing costs.

[0016] Optionally, the main power supply is also connected to the load through a second path, and the second path is connected in parallel with the DC redundancy module; the delay control module also has a second control switch, which is connected in series in the second path; the control unit is also configured to control the second control switch to close when the main power supply is restored, and to control the second control switch to open when the main power supply is de-energized.

[0017] With the above scheme, the main power supply can supply power to the load through two paths, thereby playing a redundancy role, so that even if any path fails, it can still ensure a stable power supply to the load.

[0018] Optionally, the backup power source includes a battery.

[0019] Optionally, the backup power supply also includes a diesel generator, which is activated to provide backup power when the voltage of the battery drops to a predetermined threshold.

[0020] The above solution allows for the use of diesel generators to provide power when a backup power source is required for extended periods, thus meeting the long-term power supply needs.

[0021] Optionally, the main power supply is AC mains power.

[0022] According to another aspect of this disclosure, this disclosure also provides a wind turbine generator set, the wind turbine generator set including the above-described dual redundant power supply system, the load being at least one of a main control system, a pitch system and a yaw system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a dual-redundant power supply system according to an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of a dual-redundant power supply system according to yet another embodiment of the present disclosure is shown; Figure 3 A schematic diagram of a dual-redundant power supply system according to another embodiment of the present disclosure is shown; Figure 4 A schematic diagram of a dual-redundant power supply system according to another embodiment of the present disclosure is shown. Detailed Implementation

[0025] Wind farm power grids are prone to instability and random power outages. Simultaneously, wind turbines must handle randomly triggered vortex-induced regulation and typhoon-resistant shutdowns during specific periods. Both scenarios require continuous power supply to core equipment to ensure the safety of the turbines and components. Therefore, a backup power supply needs to be configured near the wind turbine generators to supplement power during mains power outages and meet the critical power needs of the turbines. However, the currently used power switching modules have significant shortcomings: firstly, the switching process cannot achieve seamless transition, causing temporary power loss to the turbine controller, preventing it from continuously receiving control signals from higher-level systems and from properly collecting and uploading equipment operating data; secondly, after mains power is restored, the system cannot quickly switch back to normal power supply conditions, affecting turbine operating efficiency and threatening data security due to data interruption or loss.

[0026] To address this, this disclosure attempted to connect the mains power and backup power supply to the load via a DC redundancy module. When either input port of the DC redundancy module is powered, its output port supplies DC voltage to the load device. Thus, by setting up the DC redundancy module, both power supplies can be connected simultaneously during power switching, ensuring continuous power to the load device and improving data security. However, the two power supplies connected to the DC redundancy module are not differentiated into primary and backup; they have the same priority, and the switching is autonomously determined by the DC redundancy module. This uncontrolled switching process can easily lead to frequent use of the backup power supply, causing unnecessary energy waste and increasing operating costs.

[0027] Based on this, this disclosure further connects the coil of a time relay to the mains power supply, and connects the normally closed contact of the time relay in series between the backup power supply and the DC redundancy module. Thus, when the mains power is normal, the coil is energized, opening the normally closed contact and cutting off the power supply from the backup power supply to the load. Therefore, when the mains power is normal, mains power can be selected, reducing the use of the backup power supply, avoiding unnecessary energy loss, and lowering operating costs. Furthermore, because a time relay is used, when the mains power is normal, the time relay will delay opening the normally closed contact before cutting off the power supply from the backup power supply to the load. This time difference allows the mains power to supply power to the load through the DC redundancy module. Therefore, the DC redundancy module can achieve seamless switching in scenarios where both inputs are simultaneously energized, preventing the load from crashing during the switching process.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0029] This disclosure provides a dual-redundant power supply system that can be applied to wind turbine generators, data centers, and other equipment requiring uninterrupted power supply to continuously power loads and avoid the risk of power outages. Simultaneously, it prioritizes the primary power supply, reducing the use of backup power and thus lowering costs and saving energy.

[0030] Specifically, such as Figures 1 to 4As shown, a dual-redundant power supply system may include a primary power supply, a backup power supply, and a DC redundancy module. The primary and backup power supplies provide two power sources to the load. The DC redundancy module has a first input port, a second input port, and an output port. The first input port is connected to the backup power supply, and the second input port is connected to the primary power supply. When either input port of the redundancy module is receiving power, the output port of the DC redundancy module outputs a DC voltage to supply power to the load. Thus, by setting up the DC redundancy module, both power supplies can supply power simultaneously. In power supply switching scenarios, it is not necessary to disconnect the currently supplying power supply first, avoiding power outages during power switching.

[0031] The dual-redundant power supply system may also include a delay control module. This module has a control unit and a first control switch. The control unit is connected to the primary power supply, and the first control switch is positioned between the backup power supply and the DC redundancy module. The control unit is configured to open the first control switch after a predetermined delay when the primary power supply resumes operation, and to close the first control switch when the primary power supply fails. In this way, the first control switch will only close when the primary power supply fails, thus giving the primary power supply a higher priority than the backup power supply. This allows the primary power supply to be used preferentially, thereby relegating the more expensive power supply to the backup position, reducing the frequency of backup power supply usage, and saving costs and energy.

[0032] Taking the use of mains power as an example, the advantages of prioritizing mains power are cost reduction and energy saving, ensuring power supply stability, and reducing the maintenance pressure on backup power supplies, while also meeting the economic and reliability requirements of wind farm daily operation. Specifically, from the perspective of practical application scenarios, the advantages of prioritizing mains power can be divided into three points: First, it significantly reduces operating costs. Mains power is a public power supply from the grid, and its price is usually lower than the fuel, maintenance, and loss costs of backup power supplies (such as diesel generators). Under normal circumstances, using mains power can directly reduce the energy expenditure of wind farms, which meets the energy-saving requirements. Second, it improves power supply stability. The mains power grid has been built and maintained for a long time, and its power supply capacity and continuous power supply capability are far superior to those of backup power supplies. It can reduce power supply fluctuations caused by problems such as the start-up and shutdown of backup power supplies (such as diesel generators) and insufficient fuel, and is more suitable for the continuous operation requirements of wind turbine core equipment. Third, it reduces the burden on backup power supplies. Backup power supplies are designed for emergency protection. Prioritizing the use of mains power can reduce the number of times they are started and the duration of operation, reduce equipment wear and tear, extend service life, and at the same time reduce the workload of maintenance personnel in inspection and maintenance, indirectly reducing maintenance costs.

[0033] Meanwhile, considering the numerous electronic components between the main power supply and the DC redundancy module, the energizing time of the main power supply's path to the load via the DC redundancy module is longer than the energizing time of the control unit to open the first control switch. Therefore, this disclosure sets a predetermined delay after the main power supply resumes power before controlling the first control switch to open, cutting off the power supply channel from the backup power supply to the load. This predetermined delay should be longer than the energizing time of the connection between the main power supply and the DC redundancy module. In this way, the predetermined delay ensures that the main power supply has the capability to supply power to the load via the DC redundancy module, preventing a power outage when the backup power supply is disconnected, as the main power supply lacks the capability to supply power to the load via the DC redundancy module. This further avoids power outages during power switching.

[0034] In practical applications, when the primary power supply fails, the first control switch closes, and the backup power supply supplies power to the load through the DC redundancy module. When the primary power supply recovers from the fault, it supplies power to the control unit. After a predetermined delay, the control unit opens the first control switch, cutting off the power supply from the backup power supply to the load. Simultaneously, the primary power supply supplies power to the load through the DC redundancy module.

[0035] It should be noted that the specific structure of the DC redundancy module can be found in existing technologies and will not be elaborated here.

[0036] The primary power supply and the backup power supply can directly provide the voltage required by the load. Of course, the voltage provided by at least one of the primary power supply and the backup power supply may be different from the voltage required by the load. In this case, the primary power supply and / or the backup power supply can adjust the output voltage to the voltage required by the load through an energy conversion module.

[0037] For example, when the main power supply provides a voltage of 220V AC, the main power supply can be connected to the second input port through an uninterruptible power supply (UPS) to use the UPS as an energy conversion module to convert the voltage to 24V DC.

[0038] It is worth noting that by setting up an uninterruptible power supply (UPS) at the main power supply, in the event of a sudden failure of the main power supply, the built-in battery of the UPS can be used to ensure that the power supply path between the main power supply and the DC redundant module remains continuous. This ensures that the power supply to the load is uninterrupted during the process of the first control switch going from open to closed, and further avoids power outages during power switching.

[0039] In some embodiments, such as Figure 2As shown, the backup power supply can employ redundant power supply circuits to prevent the load power supply from being affected by the failure of a device in one path. Specifically, the backup power supply is also connected to the load through a first path, and the first path is connected in parallel with the DC redundancy module. One end of the first control switch is connected to the backup power supply, and the other end of the first control switch is connected to the first input port and the first path, so that the first control switch can simultaneously control the on / off state of the backup power supply and the DC redundancy module, as well as the on / off state of the backup power supply and the second path.

[0040] In this way, when the primary power supply fails, the first control switch closes, and the backup power supply can supply power to the load through the DC redundancy module and the first path. At this time, if the path containing the DC redundancy module fails, the backup power supply can still supply power to the load through the first path; if the first path fails, the backup power supply can still supply power to the load through the path containing the DC redundancy module. In other words, the backup power supply can supply power to the load through two paths, thus providing redundancy and ensuring a stable power supply to the load even if either path fails.

[0041] Furthermore, such as Figure 4 As shown, based on the redundant power supply circuit of the backup power supply, the main power supply can also adopt a redundant power supply circuit to avoid the impact on the load power supply if a device in one of the main power supply circuits fails. Specifically, the main power supply is also connected to the load through a second circuit, and the second circuit is connected in parallel with the DC redundancy module. The delay control module also has a second control switch, which is connected in series in the second circuit. The control unit is configured to close the second control switch when the main power supply resumes power supply and to open the second control switch when the main power supply fails. A diode is connected in series in the first circuit, with the anode of the diode connected to the other end of the first control switch and the cathode of the diode connected to the load, thereby using the unidirectional conductivity of the diode to prevent the power supply of the second circuit from flowing back to the backup power supply through the first circuit.

[0042] In this way, when the main power supply returns to normal, the first control switch opens and the second control switch closes, allowing the main power supply to supply power to the load through the DC redundancy module and the second path. At this time, if the path containing the DC redundancy module fails, the main power supply can still supply power to the load through the second path; conversely, if the second path fails, the main power supply can still supply power to the load through the path containing the DC redundancy module. In other words, the main power supply can supply power to the load through two paths, thus providing redundancy and ensuring stable power supply to the load even if either path fails.

[0043] In some other embodiments, such as Figure 3As shown, the main power supply can also employ a redundant power supply circuit to prevent the load power supply from being affected by the failure of a device in one of the main power supply paths. Specifically, the backup power supply is connected to the load only through a DC redundancy module, while the main power supply is also connected to the load through a second path, which is connected in parallel with the DC redundancy module. The delay control module also has a second control switch, which is connected in series in the second path. The control unit is configured to close the second control switch when the main power supply is restored and to open the second control switch when the main power supply is de-energized.

[0044] It should be noted that when the voltage provided by the main power supply is different from the voltage required by the load, the main power supply can first convert the voltage to the voltage required by the load through the uninterruptible power supply, and then connect to the load through the DC redundancy module and the second path respectively.

[0045] Regarding the specific design of the delay control module, in some embodiments, the delay control module can be a time relay, the control unit is the coil of the time relay, the first control switch is the normally closed contact of the time relay, and the second control switch is the normally open contact of the time relay. In this way, the opening and closing of the first and second control switches can be controlled by energizing and de-energizing the coil, simplifying the complexity of the dual redundant power supply system and reducing costs.

[0046] In some embodiments, the backup power supply may include a battery that provides electrical power to the load.

[0047] In practical applications, the battery can be connected to the main power source. When the main power source is normal, the battery can be float-charged by the mains power through the charger to maintain a fully charged state, ready to take over the main power source at any time.

[0048] Considering that the primary power supply may face prolonged power outages, and the battery's electrical energy may not be sufficient to support long-term power supply, in some embodiments, the backup power supply also includes a diesel generator. This generator is activated to provide backup power when the battery voltage drops to a predetermined threshold. Thus, when long-term power supply from the backup power supply is required, the diesel generator can operate to meet the long-term power demand.

[0049] According to another aspect of this disclosure, a wind turbine generator set is also provided, which includes the aforementioned dual redundant power supply system, with the load being at least one of the main control system, the pitch system, and the yaw system.

[0050] In practical applications, the main control system may include a controller and sensors for monitoring wind speed, wind direction or rotational speed; the pitch system may include a pitch motor, a pitch controller, etc.; and the yaw system may include a yaw motor and a reducer, etc.

[0051] It should be noted that the specific structure of the dual redundant power supply system can be found in the detailed description in the above embodiments, and will not be repeated here.

[0052] For ease of understanding, we will use AC mains power as the primary power source and take a wind turbine generator as an example for illustration.

[0053] In vortex-induced vibration (VEV) scenarios for wind turbines: Before grid connection (when the wind turbine has no mains power), or during a mains power outage, VEV may occur, potentially damaging components. To mitigate this risk, continuous power is needed to the internal vibration sensors, controllers, and network equipment to monitor VEV intensity. In the absence of mains power, the equipment can be powered by batteries in the backup power supply to ensure continuous operation and real-time monitoring of VEV. If necessary, a diesel generator can be remotely started via network communication to combat VEV. Once the wind turbine is connected to the grid, mains power is available. This triggers a time-limited relay, which, after a delay, switches the load's power supply from backup to primary power, allowing the wind turbine system to operate normally while the backup power supply remains in standby mode.

[0054] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0055] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A dual-redundant power supply system, characterized in that, The dual-redundant power supply system includes: Main power supply; Backup power supply; A DC redundancy module has a first input port, a second input port, and an output port. The first input port is connected to the backup power supply, and the second input port is connected to the main power supply. When any input port of the redundancy module is powered, the output port of the DC redundancy module outputs a DC voltage to power the load. The delay control module has a control unit and a first control switch. The control unit is connected to the main power supply. The first control switch is located between the backup power supply and the DC redundancy module. The control unit is configured to control the first control switch to open after a predetermined delay when the main power supply is restored, and to control the first control switch to close when the main power supply is de-energized.

2. The dual-redundant power supply system according to claim 1, characterized in that, The main power supply is connected to the second input port via an uninterruptible power supply.

3. The dual-redundant power supply system according to claim 1, characterized in that, The backup power supply is also connected to the load through a first path, and the first path is connected in parallel with the DC redundancy module; One end of the first control switch is connected to the backup power supply, and the other end of the first control switch is connected to the first input port and the first path.

4. The dual-redundant power supply system according to claim 3, characterized in that, The main power supply is also connected to the load through a second path, and the second path is connected in parallel with the DC redundancy module; The delay control module also has a second control switch connected in series in the second path. The control unit is also configured to control the second control switch to close when the main power supply is restored and to control the second control switch to open when the main power supply is de-energized. A diode is connected in series in the first path, and the positive terminal of the diode is connected to the other end of the first control switch, while the negative terminal of the diode is connected to the load.

5. The dual-redundant power supply system according to claim 4, characterized in that, The delay control module is a time relay, the control unit is the coil of the time relay, the first control switch is the normally closed contact of the time relay, and the second control switch is the normally open contact of the time relay.

6. The dual-redundant power supply system according to claim 1, characterized in that, The main power supply is also connected to the load through a second path, and the second path is connected in parallel with the DC redundancy module; The delay control module also has a second control switch connected in series in the second path. The control unit is also configured to control the second control switch to close when the main power supply is restored and to control the second control switch to open when the main power supply is de-energized.

7. The dual-redundant power supply system according to claim 1, characterized in that, The backup power source includes a battery.

8. The dual-redundant power supply system according to claim 7, characterized in that, The backup power source also includes a diesel generator, which is activated to provide backup power when the voltage of the battery drops to a predetermined threshold.

9. The dual-redundant power supply system according to claim 1, characterized in that, The main power supply is AC mains power.

10. A wind turbine generator set, characterized in that, The wind turbine generator set includes the dual redundant power supply system as described in any one of claims 1 to 9, wherein the load is at least one of the main control system, the pitch system, and the yaw system.

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