Emergency power protection device of power plant
By introducing emergency power protection devices of transformers and photovoltaic systems in thermal power plants, the problem of diesel generator failure to start was solved, external power and photovoltaic power were integrated, the power supply reliability and flexibility of the power plant were improved, and a safe and stable power supply was ensured.
Patent Information
- Application Number
- CN202422742725.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-11
AI Technical Summary
When the diesel generators in thermal power plants fail to start or stop operating, there is a lack of effective emergency power supply to restore production and living electricity within the plant, resulting in unstable power systems.
An emergency power protection device including the first and second transformers, an interface and a photovoltaic system is used to achieve voltage conversion through the transformer, receive power from an external power plant and integrate the power of the photovoltaic system into the factory power system to provide backup power.
It improves the power supply reliability and flexibility of the power plant when the diesel generator fails to work, and ensures the safe and stable operation of the power plant.
Smart Images
Figure CN223378940U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of power supply, and in particular to an emergency power protection device for a power plant. Background Art
[0002] As a crucial component of traditional energy supply, thermal power plants not only provide stable power output but also offer peak load regulation and rapid start-up and shutdown capabilities, playing a crucial role in power system stability. Therefore, the safety of thermal power plants is crucial when it comes to energy security. A complete power outage would not only significantly impact the grid system but also damage equipment within the plant.
[0003] In the event that the power supply system cannot be restored within a short period of time, diesel generators are usually used as an emergency power source. However, if the diesel generators cannot be started or need to be shut down, the thermal power plant lacks an effective emergency power source to restore production and living electricity within the plant. Utility Model Content
[0004] In order to solve the above problems, the present disclosure provides an emergency power protection device for a power plant, comprising: a first transformer, a second transformer, a first interface, a second interface, and a photovoltaic system, wherein:
[0005] The high-voltage side of the first transformer is connected to the first interface, and the low-voltage side of the first transformer is connected to the second interface;
[0006] The low-voltage side of the second transformer is connected to the photovoltaic system, and the high-voltage side of the second transformer is connected to the second interface;
[0007] The first interface is used to connect to the power output port of an external power plant;
[0008] The second interface is used to connect to the power input port of an external power-consuming device.
[0009] In one embodiment, a first fuse is further included, and the first fuse is connected between the low-voltage side of the first transformer and the second interface.
[0010] In one embodiment, the system further includes a first switch connected between the first interface and the high-voltage side of the first transformer.
[0011] In one embodiment, the first switch is a circuit breaker.
[0012] In one embodiment, a second fuse is further included, and the second fuse is connected between the high voltage side of the second transformer and the second interface.
[0013] In one embodiment, the system further includes a second switch connected between the photovoltaic system and the low-voltage side of the second transformer.
[0014] In one embodiment, the second switch is a circuit breaker.
[0015] In one embodiment, when the photovoltaic system cannot supply power to the external electrical device, the second switch is automatically disconnected.
[0016] In one embodiment, the rated capacity of the first transformer is 1250 kVA.
[0017] In one embodiment, the rated capacity of the second transformer is between 100 kVA and 800 kVA.
[0018] The above technical solution, when the power supply system and diesel generator of the power plant itself cannot work normally, the emergency power protection device uses a transformer to achieve voltage conversion. It can not only receive power from external power plants, but also integrate the power generated by the photovoltaic system into the plant power system. It can solve the problem of traditional emergency power supply solutions relying on diesel engines, improve the reliability and flexibility of power supply, and provide protection for the safe and stable operation of the power plant.
[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0021] Figure 1 is a block diagram of an emergency power protection device of a power plant according to an exemplary embodiment;
[0022] Figure 2 The figure is a block diagram of an emergency power protection device of a power plant according to another exemplary embodiment.
[0023] Description of Reference Numerals
[0024] The first interface 110 , the first transformer 120 , the photovoltaic system 130 , the second transformer 140 , the second interface 150 , the first fuse 210 , the first switch 220 , the second fuse 230 , the second switch 240 , and the external power consumption device 300 . DETAILED DESCRIPTION
[0025] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.
[0026] Figure 1 FIG. 1 is a block diagram of an emergency power protection device of a power plant according to an exemplary embodiment. Figure 1 As shown, the emergency power protection device of the power plant includes: a first transformer 120, a second transformer 140, a first interface 110, a second interface 150 and a photovoltaic system 130, wherein: the high-voltage side of the first transformer 120 is connected to the first interface 110, and the low-voltage side of the first transformer 120 is connected to the second interface 150; the low-voltage side of the second transformer 140 is connected to the photovoltaic system 130, and the high-voltage side of the second transformer 140 is connected to the second interface 150; the first interface 110 is used to connect to the power supply output port of an external power plant; the second interface 150 is used to connect to the power input port of an external electrical equipment 300.
[0027] Here, the first transformer 120 is used to adjust the voltage of the AC power provided by the external power plant. Specifically, it reduces the high-voltage AC power provided by the external power plant to a low-voltage AC power suitable for the external power users 300. The first transformer 120 can select a corresponding step-down transformer based on the output voltage level of the external power plant (e.g., 35 kV or 110 kV). The second transformer 140 steps up the low-voltage DC power provided by the photovoltaic system 130 and converts it into AC power suitable for the external power users 300. The second transformer 140 can be selected based on the required voltage of the external power users 300.
[0028] The use of the first transformer 120 and the second transformer 140 can achieve matching conversion of the voltage levels of the power supply voltage and the power consumption voltage, and can also achieve electrical isolation, improve safety, and facilitate voltage regulation and control.
[0029] When the power plant where the external power-consuming device 300 is located is unable to supply power, the device can be directly connected to the power input interface of the external power-consuming device 300 through the second interface 150. During the day and when the power demand of the external power-consuming device 300 is low, the photovoltaic system 130 in the device can be powered independently. If the power demand is high during the day and the power provided by the photovoltaic system 130 is insufficient, the power output interface of the external power plant can be connected through the first interface 110 to realize the joint power supply of the photovoltaic system 130 and the power of the external power plant. At night, the photovoltaic system 130 can continue to supply power using the stored electricity until the reserved power is exhausted. At this time, the power output interface of the external power plant can be connected through the first interface 110, and the power of the external power plant can be used to maintain power supply.
[0030] It should be understood that the external power-consuming device 300 may be a power-consuming device of a power plant, and therefore there may be a plurality of such devices. Figure 2FIG. 1 is a block diagram of an emergency power protection device of a power plant according to another exemplary embodiment. Figure 2 As shown, the second interface 150 can be directly connected to the main transmission bus of the external power-consuming device 300. Subsequently, the current is transformed and divided from the main transmission bus before being transmitted to each plant power-consuming device.
[0031] The above technical solution, when the power supply system and diesel generator of the power plant itself cannot work normally, the emergency power protection device realizes voltage conversion through the transformer, which can not only receive power from the external power plant, but also integrate the power generated by the photovoltaic system 130 into the plant power system. It can solve the problem of traditional emergency power supply solutions relying on diesel engines, improve the reliability and flexibility of power supply, and provide protection for the safe and stable operation of the power plant.
[0032] In one embodiment, if Figure 2 As shown, the emergency power protection device of the power plant may further include a first fuse 210 , which is connected between the low-voltage side of the first transformer 120 and the second interface 150 .
[0033] Here, installing a first fuse 210 between the low-voltage side of the first transformer 120 and the second interface 150 can prevent damage to the first transformer 120 due to excessive loads on the external electrical device 300, while also protecting the transmission lines within the device from external power plant influences. When a short circuit occurs in the transmission line connected to the external power plant within the device, the first fuse 210 can quickly cut off the short-circuit current, thereby protecting the low-voltage side of the first transformer 120 from damage. When selecting the first fuse 210, its voltage level can be determined based on the voltage on the low-voltage side of the first transformer 120, and the appropriate current level can be selected based on the rated capacity of the first transformer 120.
[0034] In one embodiment, if Figure 2 As shown, the emergency power protection device of the power plant may further include a first switch 220 , which is connected between the first interface 110 and the high voltage side of the first transformer 120 .
[0035] Here, the first switch 220, disposed between the first interface 110 and the high-voltage side of the first transformer 120, can control the power input from the external power plant and provide overcurrent protection to achieve visible power outages. When selecting the first switch 220, its voltage level can be determined based on the voltage on the high-voltage side of the first transformer 120. Furthermore, the first switch 220 can be a switch with remote control capabilities.
[0036] In one embodiment, the first switch 220 is a circuit breaker.
[0037] Here, the circuit breaker may be a vacuum circuit breaker or an SF6 circuit breaker. The circuit breaker may be a circuit breaker equipped with a protection device and an operating mechanism.
[0038] In one embodiment, if Figure 2 As shown, the emergency power protection device of the power plant may further include a second fuse 230 , which is connected between the high voltage side of the second transformer 140 and the second interface 150 .
[0039] Here, installing a second fuse 230 between the high-voltage side of the second transformer 140 and the second interface 150 prevents damage to the second transformer 140 caused by excessive loads on external electrical devices 300, while also protecting the transmission lines within the installation from the effects of the photovoltaic system 130. If a short circuit occurs in the transmission lines connected to the photovoltaic system 130 within the installation, the second fuse 230 quickly interrupts the short-circuit current, protecting the high-voltage side of the second transformer 140 from damage. Furthermore, the second fuse 230 prevents reverse overcurrent and isolates the faulty area, thereby ensuring the safe operation of the photovoltaic system 130.
[0040] When selecting the second fuse 230 , its voltage level can be determined according to the high-voltage side voltage of the second transformer 140 , and a suitable current level can be selected according to the rated capacity of the second transformer 140 .
[0041] In one embodiment, if Figure 2 As shown, the emergency power protection device of the power plant may further include a second switch 240 , which is connected between the photovoltaic system 130 and the low-voltage side of the second transformer 140 .
[0042] Here, the second switch 240, located between the second interface 150 and the low-voltage side of the second transformer 140, can control the access of the photovoltaic system 130 to achieve grid connection control and provide overcurrent protection to achieve visible power outages. When selecting the second switch 240, its voltage level can be determined based on the voltage on the low-voltage side of the second transformer 140. Furthermore, the second switch 240 can be a switch with remote control capabilities.
[0043] In one embodiment, the second switch 240 is a circuit breaker.
[0044] Here, the circuit breaker may be a dedicated photovoltaic grid-connected circuit breaker and may be equipped with undervoltage and overvoltage protection.
[0045] In one embodiment, the emergency power protection device of the power plant automatically disconnects the second switch 240 when the photovoltaic system 130 cannot supply power to the external electrical device 300.
[0046] Here, the second switch 240 can automatically disconnect when the photovoltaic system 130 experiences power supply anomalies. Specifically, the second switch 240 monitors the output status of the photovoltaic system 130 and can be triggered to disconnect when it detects the following conditions: insufficient sunlight resulting in low output power, a photovoltaic system failure, a photovoltaic inverter failure, or a photovoltaic output frequency exceeding the allowable range of the external power device 300.
[0047] In one embodiment, the rated capacity of the first transformer 120 is 1250 kilovolt-amperes (kVA).
[0048] Here, since the supply voltage of the external power plant is relatively large, a relatively large rated capacity can be set to be suitable for the base load demand of the power equipment of the power plant.
[0049] In one embodiment, the rated capacity of the second transformer 140 is between 100 kVA and 800 kVA.
[0050] like Figure 2 As shown, photovoltaic system 130 can have various configurations. Specifically, it can be a single photovoltaic module or a photovoltaic array consisting of multiple photovoltaic modules connected in series. The rated capacity of second transformer 140 is designed to range from 100 kVA to 800 kVA. This design can adapt to photovoltaic systems of different sizes, thereby meeting diverse emergency power supply needs.
[0051] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.
[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0053] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. An emergency power protection device for a power plant, characterized in that: include: A first transformer (120), a second transformer (140), a first interface (110), a second interface (150), and a photovoltaic system (130), wherein: The high-voltage side of the first transformer (120) is connected to the first interface (110), and the low-voltage side of the first transformer (120) is connected to the second interface (150); The low-voltage side of the second transformer (140) is connected to the photovoltaic system (130), and the high-voltage side of the second transformer (140) is connected to the second interface (150); The first interface (110) is used to connect to a power output port of an external power plant; The second interface (150) is used to connect to the power input port of the external power-consuming device (300).
2. The emergency power protection device according to claim 1, characterized in that: It also includes a first fuse (210), which is connected between the low-voltage side of the first transformer (120) and the second interface (150).
3. The emergency power protection device according to claim 1, characterized in that: It also includes a first switch (220), which is connected between the first interface (110) and the high-voltage side of the first transformer (120).
4. The emergency power protection device according to claim 3, characterized in that: The first switch (220) is a circuit breaker.
5. The emergency power protection device according to any one of claims 1 to 4, characterized in that: It also includes a second fuse (230), which is connected between the high-voltage side of the second transformer (140) and the second interface (150).
6. The emergency power protection device according to any one of claims 1 to 4, characterized in that: It also includes a second switch (240), which is connected between the photovoltaic system (130) and the low-voltage side of the second transformer (140).
7. The emergency power protection device according to claim 6, characterized in that: The second switch (240) is a circuit breaker.
8. The emergency power protection device according to claim 6, characterized in that: In the event that the photovoltaic system (130) is unable to supply power to the external power-consuming device (300), the second switch (240) is automatically disconnected.
9. The emergency power protection device according to claim 6, characterized in that: The rated capacity of the first transformer (120) is 1250 kVA.
10. The emergency power protection device according to claim 6, characterized in that: The rated capacity of the second transformer (140) is between 100 kVA and 800 kVA.