Diesel generating set storage battery charging device for offshore wind power
By designing an automatic switching mechanism in offshore wind farms, the problem of mutual interference between battery charging methods was solved, enabling continuous charging of batteries and a stable power supply, thus ensuring the normal start-up of diesel generator sets.
Patent Information
- Application Number
- CN202422783745.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-15
AI Technical Summary
In existing technologies, the batteries in offshore wind farms are difficult to charge effectively when the mains power supply fails, and the various charging methods are prone to mutual interference, affecting the normal starting of diesel generator sets.
A battery charging device for offshore wind power diesel generator sets was designed. The device connects the battery to a photovoltaic charging mechanism, a mains charging mechanism, and the charger built into the diesel generator set through an automatic switching mechanism. This establishes charging priorities, avoids mutual interference, and continues to supply power to the battery when other methods are not working.
It enables continuous charging of the battery, ensuring normal power supply when unattended and without mains power assistance, avoiding interference between charging methods, and providing a stable power guarantee for the start-up of the diesel generator set.
Smart Images
Figure CN223625619U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a battery charging device in the field of diesel generator set technology. Background Technology
[0002] The advantages of offshore wind farms are mainly that they do not occupy land resources, are largely unaffected by topography, offer higher wind speeds, have abundant wind energy resources, and allow for larger single-unit capacity wind turbines. However, because they are located at sea, far from the shore, diesel generator sets are needed as backup power to ensure normal operation. The starting power for these diesel generator sets comes from batteries, so it is essential to ensure that the batteries are always charged enough to start the generators. Currently, mains power is used to power the batteries, but as the distance between offshore wind farms and the shore increases, laying mains power becomes more difficult, and in the event of a mains power failure, it is difficult to repair in a timely manner, resulting in ineffective charging of the batteries. Utility Model Content
[0003] The purpose of this invention is to provide a battery charging device for offshore wind power diesel generator sets, which can realize multiple charging methods to ensure that the battery can be effectively and continuously charged, and that different charging methods do not interfere with each other.
[0004] To achieve the above objectives, this utility model provides a battery charging device for offshore wind power diesel generator sets, including a battery. The battery is characterized in that it is connected to a photovoltaic charging mechanism and a mains charging mechanism via an automatic switching mechanism. The battery is also connected to a charger built into the diesel generator set, and the charger is connected to the automatic switching mechanism.
[0005] Compared with the prior art, the beneficial effect of this utility model is that, through the automatic switching mechanism, the charger has the highest charging priority, followed by the mains charging mechanism, and then the photovoltaic charging mechanism. These three charging methods support each other without interference, and can also supply power to the battery when the other two are not working. In particular, by supplying power to the battery through the photovoltaic charging mechanism, it is possible to achieve unattended operation and continuous charging of the battery without mains power assistance.
[0006] As a further improvement of this utility model, the automatic switching mechanism includes relay K20 and relay K21. Pins 1 and 2 of the normally closed contact of relay K20 are connected to the photovoltaic charging mechanism. Pins 9 and 10 of the normally closed contact of relay K20 are connected to pins 1 and 2 of the first normally closed contact of relay K21, respectively. Pins 9 and 10 of the first normally closed contact of relay K21 are connected to the positive and negative terminals of the battery, respectively.
[0007] The normally closed contacts 2 of relay K21, pins 3 and 4, are connected to the mains charging mechanism. The normally closed contacts 2 of relay K21, pins 11 and 12, are connected to the normally open contacts 3 and 4 of relay K20, respectively. The normally open contacts 7 and 5 of relay K20 are connected to the positive and negative terminals of the battery, respectively. The coil of relay K21 is connected to the mains control of the diesel generator set, pins 3 and 4, respectively. The coil of relay K20 is connected to the mains charging mechanism.
[0008] In this way, the three control modes can be automatically switched through relays K20 and K21, thereby avoiding mutual interference. It can also keep one of them charging the battery when the other two are not working.
[0009] As a further improvement of this utility model, the photovoltaic charging mechanism includes a photovoltaic panel. The DC+ and DC- pins of the photovoltaic panel are connected to pins 4 and 3 of the photovoltaic controller via circuit breaker F1. The DC+ and DC- pins of the photovoltaic panel are also grounded via a surge arrester. Pins 2 and 1 of the photovoltaic controller are connected to pins 1 and 2 of the normally closed contact of relay K20, respectively. Pins 6 and 5 of the photovoltaic controller are connected to the input terminal of the voltage regulator. The output terminal of the voltage regulator is connected to the spare socket via circuit breaker F2.
[0010] In this way, the photovoltaic panels generate electricity, which is then output as DC power by the photovoltaic controller. When the normally closed contacts of relays K20 and K21 are closed, the battery is charged. The photovoltaic controller also has a reserved 24V output to provide a backup low-voltage power supply for the offshore wind farm.
[0011] As a further improvement of this utility model, the mains charging mechanism includes a mains float charger. The input end of the mains float charger is connected to the mains power. The mains float charger is also connected to the coil of relay K20. The positive and negative terminals of the output end of the mains float charger are respectively connected to pins 3 and 4 of the normally closed contact 2 of relay K21.
[0012] In this way, the AC power is converted into DC power through the AC power float charger. When both the normally closed contact of relay K21 and the normally open contact of relay K20 are in the closed state, the AC power can charge the battery.
[0013] As a further improvement of this utility model, the positive and negative terminals of the charger are connected to the positive and negative terminals of the battery, respectively.
[0014] In this way, as long as the diesel generator set is running and the charger is working, both normally closed contacts of relay K21 will be in the open state, thus cutting off the connection between the photovoltaic charging mechanism and the mains charging mechanism and the battery, thereby ensuring that only the charger supplies power to the battery and avoiding mutual interference.
[0015] As a further improvement of this utility model, pin 2 of the diesel generator set's main control unit is connected to pin 7 of the photovoltaic controller, and pin 1 of the diesel generator set's main control unit is connected to pin 1 of the mains power float charger.
[0016] When the photovoltaic charging mechanism and the mains charging mechanism malfunction, pin 7 of the photovoltaic controller and pin 1 of the mains floating charger will output a fault signal to the diesel generator set's main control unit. The main control unit will then send the fault signal to the control room on shore to notify maintenance personnel to carry out repairs. Attached Figure Description
[0017] Figure 1 This is the electrical wiring connection diagram for this utility model. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings:
[0019] like Figure 1 The device shown is a battery charging device for a diesel generator set used in offshore wind power. The battery is connected to a photovoltaic charging mechanism and a mains charging mechanism via an automatic switching mechanism. The battery is also connected to a charger built into the diesel generator set, and the charger is connected to the automatic switching mechanism.
[0020] The automatic switching mechanism includes relays K20 and K21. Pins 1 and 2 of the normally closed contacts of relay K20 are connected to the photovoltaic charging mechanism. Pins 9 and 10 of the normally closed contacts of relay K20 are connected to pins 1 and 2 of normally closed contact one of relay K21, respectively. Pins 9 and 10 of normally closed contact one of relay K21 are connected to the positive and negative terminals of the battery, respectively. Pins 3 and 4 of normally closed contact two of relay K21 are connected to the mains charging mechanism. Pins 11 and 12 of normally closed contact two of relay K21 are connected to pins 3 and 4 of normally open contacts of relay K20, respectively. Pins 7 and 5 of normally open contacts of relay K20 are connected to the positive and negative terminals of the battery, respectively. The two ends of the coil of relay K21 are connected to pins 3 and 4 of the diesel generator set's main control circuit, respectively. The two ends of the coil of relay K20 are connected to the mains charging mechanism.
[0021] The photovoltaic charging mechanism includes a photovoltaic panel. The DC+ and DC- pins of the photovoltaic panel are connected to pins 4 and 3 of the photovoltaic controller via circuit breaker F1. The DC+ and DC- pins of the photovoltaic panel are also grounded via a surge arrester. Pins 2 and 1 of the photovoltaic controller are connected to pins 1 and 2 of the normally closed contact of relay K20, respectively. Pins 6 and 5 of the photovoltaic controller are connected to the input terminal of the voltage regulator. The output terminal of the voltage regulator is connected to the spare socket via circuit breaker F2.
[0022] The mains charging mechanism includes a mains float charger. The input terminal of the mains float charger is connected to the mains power. The mains float charger is also connected to the coil of relay K20. The positive and negative terminals of the output terminal of the mains float charger are connected to pins 3 and 4 of the normally closed contact 2 of relay K21, respectively.
[0023] The positive and negative terminals of the charger are connected to the positive and negative terminals of the battery, respectively, and are also connected to the two ends of the coil of relay K21. Pin 2 of the diesel generator's main control unit is connected to pin 7 of the photovoltaic controller, and pin 1 of the diesel generator's main control unit is connected to pin 1 of the mains float charger.
[0024] In this invention, the coil of relay K20 is connected to the input terminal of the mains power float charger, while the coil of relay K21 is connected to the diesel generator set's main control unit.
[0025] When the diesel generator set is working, the charger also starts working at the same time. The main control of the diesel generator outputs a high level, which energizes the coil of relay K21. This causes the normally closed contacts one and two of relay K21 to open, and the output terminals 1 and 2 of the photovoltaic controller are disconnected from the battery. At the same time, the positive and negative output terminals of the mains float charger are also disconnected from the battery. Ultimately, only the charger of the diesel generator set can output DC power to charge the battery.
[0026] When the diesel generator set stops working, the charger also stops working at the same time, and its output terminal is de-energized. The diesel generator master control outputs a low level, and the coil of relay K21 is de-energized, causing the normally closed contacts one and two of relay K21 to operate and return to the closed state. If the mains power is connected at this time, the coil of relay K20 is energized, causing the normally closed contacts of relay K20 to open and the normally open contacts to close. In this way, the output terminals 1 and 2 of the photovoltaic controller are disconnected from the battery, and only the positive and negative output terminals of the mains float charger supply power to the battery.
[0027] When the diesel generator set stops working, the mains power also stops supplying power. At this time, the coil of relay K21 is de-energized, causing the normally closed contacts of relay K21 to be closed. The coil of relay K20 is de-energized, causing the normally closed contacts of relay K20 to close and the normally open contacts to open. Thus, the positive and negative terminals of the mains float charger are disconnected from the battery. Only the output terminals 1 and 2 of the photovoltaic controller are connected to the battery, thereby charging the battery.
[0028] When the mains power float charger malfunctions, its fault signal is output from pin 1 to the diesel generator set's main control unit. Similarly, when the photovoltaic controller malfunctions, its fault signal is output from pin 7 to the diesel generator set's main control unit. The main control unit then sends an alarm signal to the shore-based control room, reminding maintenance personnel to be dispatched for repairs.
[0029] The output of the photovoltaic controller is connected to a spare socket via a DC24V voltage regulator to provide a stable 24V voltage for the offshore wind farm.
[0030] This invention can ensure that the battery can be effectively and continuously charged through three means, especially by using a photovoltaic charging mechanism to power the battery, thereby enabling unattended operation and continuous charging of the battery without mains power assistance. Furthermore, the three charging methods are prioritized and will not interfere with each other, providing a stable guarantee for the start-up of the diesel generator set.
[0031] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.
Claims
1. A battery charging device for an offshore wind power diesel generator set, comprising a battery, characterized in that, The battery is connected to the photovoltaic charging mechanism and the mains charging mechanism via an automatic switching mechanism. The battery is also connected to the charger built into the diesel generator set, and the charger is connected to the automatic switching mechanism. The automatic switching mechanism includes relays K20 and K21. Pins 1 and 2 of the normally closed contacts of relay K20 are connected to the photovoltaic charging mechanism. Pins 9 and 10 of the normally closed contacts of relay K20 are connected to pins 1 and 2 of the first normally closed contact of relay K21, respectively. Pins 9 and 10 of the first normally closed contact of relay K21 are connected to the positive and negative terminals of the battery, respectively. The normally closed contacts 2 of relay K21, pins 3 and 4, are connected to the mains charging mechanism. The normally closed contacts 2 of relay K21, pins 11 and 12, are connected to the normally open contacts 3 and 4 of relay K20, respectively. The normally open contacts 7 and 5 of relay K20 are connected to the positive and negative terminals of the battery, respectively. The coil ends of relay K21 are connected to pins 3 and 4 of the diesel generator set's main control circuit, respectively, and the coil ends of relay K20 are connected to the mains charging mechanism.
2. The battery charging device for an offshore wind power diesel generator set according to claim 1, characterized in that: The photovoltaic charging mechanism includes a photovoltaic panel. The DC+ and DC- pins of the photovoltaic panel are connected to pins 4 and 3 of the photovoltaic controller via circuit breaker F1. The DC+ and DC- pins of the photovoltaic panel are also grounded via a surge arrester. Pins 2 and 1 of the photovoltaic controller are connected to pins 1 and 2 of the normally closed contact of relay K20, respectively. Pins 6 and 5 of the photovoltaic controller are connected to the input terminal of the voltage regulator, and the output terminal of the voltage regulator is connected to the spare socket via circuit breaker F2.
3. A battery charging device for an offshore wind power diesel generator set according to claim 2, characterized in that: The mains charging mechanism includes a mains float charger. The input terminal of the mains float charger is connected to the mains power. The mains float charger is also connected to the coil of relay K20. The positive and negative terminals of the output terminal of the mains float charger are connected to pins 3 and 4 of the normally closed contact 2 of relay K21, respectively.
4. A battery charging device for an offshore wind power diesel generator set according to claim 3, characterized in that: The positive and negative terminals of the charger are connected to the positive and negative terminals of the battery, respectively.
5. A battery charging device for an offshore wind power diesel generator set according to claim 4, characterized in that: Pin 2 of the diesel generator set's main control unit is connected to pin 7 of the photovoltaic controller, and pin 1 of the diesel generator set's main control unit is connected to pin 1 of the mains power float charger.