Emergency power supply system

Abstract

The utility model relates to the technical field of generators, in particular to an emergency power supply system. The emergency power supply system comprises a variable frequency motor, a reverse dragging control module, an inverter, a power part and an energy storage battery, a rotor of the variable frequency motor is in transmission connection with the power part; the output end of the variable frequency motor is electrically connected with the input end of the inverter; the reverse dragging control module is electrically connected with the variable frequency motor and the inverter and is in communication connection with the inverter. The inverter is electrically connected with the power part and the energy storage battery, the generator can be started without starting a motor, the starting current is small, and the problems that the load cannot be carried due to instant overload of the generator and the energy use efficiency is low can be solved.

Description

Technical Field

[0001] This utility model relates to the technical field of generators, and more specifically to an emergency power supply system. Background Technology

[0002] Generators are mechanical devices that convert mechanical energy into electrical energy. They work by converting energy generated by a power source into mechanical energy, which is then transmitted to a generator, and finally converted into electrical energy. The power source can be a water turbine (driven by water flow), a steam turbine (driven by airflow), a diesel engine (driven by fuel combustion), or other power machinery.

[0003] In home emergency power scenarios, generators use power-driven industrial frequency generators to directly supply power to household loads. Generators require batteries and starter motors. The battery powers the starter motor, which in turn drives the generator to produce electricity. The battery's starting current is large. Furthermore, traditional generators have a fixed rotational speed, calculated as F = P * N / 60, where F represents the generator's frequency in Hertz (Hz), P represents the number of pole pairs, and N represents the generator's rotational speed in revolutions per minute (rpm). When users select generators for electric loads, there is a possibility of instantaneous overload where the generator cannot handle the load. Additionally, the generator's efficiency varies under different loads, and it needs to run continuously while waiting, resulting in relatively low energy efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an emergency power supply system that can start a generator without the need for a starter motor, has a small starting current, and can solve the problems of generator being unable to handle the load due to instantaneous overload and low energy efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model provides an emergency power supply system, including: a variable frequency motor, a reverse drag control module, an inverter, a power component, and an energy storage battery; the rotor of the variable frequency motor and the power component are connected by transmission, and the output end of the variable frequency motor and the input end of the inverter are electrically connected; the reverse drag control module is electrically connected to the variable frequency motor and the inverter respectively, and is also connected to the inverter by communication; the inverter is electrically connected to the power component and the energy storage battery respectively.

[0007] By adopting the above technical solution, the inverter can collect the speed signal of the power unit and perform shutdown and speed control on the power unit. The power unit can drive the variable frequency motor to rotate and generate electricity, and the variable frequency motor can drive the power unit in the opposite direction to start it. When the unit needs to be started, the inverter sends a start signal to the reverse drive control module, and the energy storage battery provides the reverse drive control module with drive power through the inverter. After receiving the control signal from the inverter, the reverse drive control module drives the variable frequency motor to rotate. When the reverse drive control module detects that the start judgment speed has been reached, the reverse drive control module automatically disconnects the magneto drive power. After generating electricity, the variable frequency motor can provide power to the inverter to supply the load. Excess electricity can be sent to the energy storage battery for storage. The energy storage battery can discharge, and the discharged DC power can enter the inverter to supply power to the load. Furthermore, the inverter output meets the rated output voltage requirements. In the above process, due to the use of rectifier-inverter technology, the design avoids the traditional fixed relationship between the power generation output frequency and the power speed, thus realizing the adjustment of the power speed to different loads, which can better utilize energy and reduce traditional fuel consumption.

[0008] Optionally, the inverter includes a rectifier and voltage regulator module, a DC-AC inverter module, and a DC-DC converter module; the input terminal of the rectifier and voltage regulator module is electrically connected to the output terminal of the variable frequency motor, and the rectifier and voltage regulator module and the DC-AC inverter module are connected in series; the DC-DC converter module has three input and output terminals, one of which is electrically connected to the energy storage battery, another of which is electrically connected between the rectifier and voltage regulator module and the DC-AC inverter module, and the last of which is electrically connected to the DC-AC inverter module; the reverse drag control module is electrically connected between the rectifier and voltage regulator module and the DC-DC converter module.

[0009] By adopting the above technical solution, when the unit needs to be started, the inverter sends a start signal to the reverse drag control module, and the energy storage battery provides drive power to the reverse drag control module through the DC-DC conversion module. After the variable frequency motor generates electricity, it can provide AC power to the rectifier and voltage regulator module. The rectifier and voltage regulator module rectifies the AC power into DC power, which can then be sent to the DC-AC inverter module, which provides AC power to the load. Alternatively, it can be sent to the DC-DC conversion module, which provides DC power to the load. Excess electricity can be sent by the DC-DC conversion module to the energy storage battery for storage. The energy storage battery can discharge, and the discharged DC power can either enter the DC-DC conversion module and directly output DC power to the load, or it can be inverted by the DC-AC inverter module to provide AC power to the load.

[0010] Optionally, the inverter is connected to a mode selection module, which is used to select between the energy-saving mode, hybrid mode, and generator mode of the emergency power system.

[0011] By adopting the above technical solution, the mode selection module can switch the working mode of the emergency power system, improving its applicability during use.

[0012] Optionally, the inverter is connected to a photovoltaic power generation module and / or a wind power generation module.

[0013] By adopting the above technical solutions, photovoltaic power generation modules and / or wind power generation modules can generate electricity and supply power through inverters.

[0014] In summary, this utility model has at least the following beneficial technical effects:

[0015] This emergency power system, through the cooperation of the variable frequency motor, reverse drag control module, inverter, power components and energy storage battery, can start the generator without the need for a starter motor, with a small starting current, and can solve the problems of generator being unable to support the load due to instantaneous overload and low energy efficiency. Attached image description:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Variable frequency motor; 2. Reverse drive control module; 3. Inverter; 31. Rectifier and voltage regulator module; 32. DC-AC inverter module; 33. DC-DC conversion module; 4. Power component; 5. Energy storage battery; 6. Mode selection module. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] The terminology used in the following embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification and appended claims of this utility model, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this utility model refers to and includes any or all possible combinations of one or more of the listed items. The term “exemplary” means “serving as an example, embodiment, or illustration,” and any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. The terms “first” and “second” are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include one or more of that feature, and in the description of embodiments of this utility model, unless otherwise stated, “a plurality” means two or more.

[0020] This embodiment provides an emergency power supply system.

[0021] refer to Figure 1 An emergency power supply system includes: a variable frequency motor 1, a reverse drag control module 2, an inverter 3, a power component 4, and an energy storage battery 5.

[0022] The rotor of the variable frequency motor 1 is connected to the power component 4 via a transmission connection, and the output terminal of the variable frequency motor 1 is electrically connected to the input terminal of the inverter 3. The reverse drag control module 2 is electrically connected to the variable frequency motor 1 and the inverter 3, and is also communicatively connected to the inverter 3. The inverter 3 is electrically connected to the power component 4 and the energy storage battery 5, and its output terminal can be electrically connected to the load to supply power to the load.

[0023] Inverter 3 includes a rectifier and voltage regulator module 31, a DC-AC inverter module 32, and a DC-DC converter module 33. The input terminal of the rectifier and voltage regulator module 31 serves as the input terminal of inverter 3 and is electrically connected to the output terminal of the variable frequency motor 1. The rectifier and voltage regulator module 31 and the DC-AC inverter module 32 are connected in series. The output terminal of the DC-AC inverter module 32 serves as the output terminal of inverter 3 and can be electrically connected to the load. The DC-DC converter module 33 has three input / output terminals. One input / output terminal is electrically connected to the energy storage battery 5, another input / output terminal is electrically connected between the rectifier and voltage regulator module 31 and the DC-AC inverter module 32, and the last input / output terminal is electrically connected to the DC-AC inverter module 32. The reverse drag control module 2 is electrically connected between the rectifier and voltage regulator module 31 and the DC-DC converter module 33 (or, in other words, electrically connected between the DC-AC inverter module 32 and the DC-DC converter module 33).

[0024] In the aforementioned emergency power system, inverter 3 can acquire the speed signal of power component 4 and perform shutdown and speed control on power component 4. Power component 4 can drive variable frequency motor 1 to generate electricity, and variable frequency motor 1 can drive power component 4 in the reverse direction to start it. When the unit needs to be started, inverter 3 sends a start signal to reverse drive control module 2, and energy storage battery 5 provides drive power to reverse drive control module 2 through DC-DC conversion module 33. After receiving the control signal from inverter 3, reverse drive control module 2 drives variable frequency motor 1 to rotate. When reverse drive control module 2 detects that the start-up judgment speed has been reached, reverse drive control module 2 automatically disconnects the magneto drive power.

[0025] After generating electricity, the variable frequency motor 1 provides AC power to the rectifier and voltage regulator module 31. The rectifier and voltage regulator module 31 rectifies the AC power into DC power, which is then supplied to the DC-AC inverter module 32, providing AC power to the load. Alternatively, it can be supplied to the DC-DC converter module 33, which provides DC power to the load. Excess electricity can be transferred by the DC-DC converter module 33 to the energy storage battery 5 for storage. The energy storage battery 5 can discharge, and the discharged DC power can either enter the DC-DC converter module 33 and directly output DC power to the load, or it can be inverted by the DC-AC inverter module 32 to provide AC power to the load. Furthermore, the output of the inverter 3 meets the rated output voltage requirements.

[0026] In the above process, due to the adoption of rectifier-inverter technology, the design avoids the fixed relationship between the traditional power generation output frequency and the power speed. Therefore, it can adjust the power speed to different speeds for different loads, which can better utilize energy and reduce traditional fuel consumption.

[0027] Meanwhile, through the energy storage battery 5, the load power and the battery can be output together to drive the load. That is, when faced with electric loads with instantaneous high power, sudden drop in power speed, and instantaneous power shortage, the inverter 3 controls the battery power to supplement the generator output, achieving the characteristic of strong overload resistance.

[0028] Furthermore, by utilizing the energy storage characteristics of the energy storage battery 5 and the generator's maximum efficiency point, additional power can be supplied to charge the energy storage battery 5 while still meeting the load requirements. Simultaneously, the energy storage battery 5 can also be used for load applications. The unit does not need to be in a continuous operating state. This allows for better energy utilization and reduces traditional fuel consumption.

[0029] Finally, the energy storage battery 5 drives the variable frequency motor 1 to start the generator set. This changes the traditional generator set starting method. The advantages of this design are: the variable frequency motor 1 has high power, low drive current, high speed, and strong starting performance. The traditional control method involves configuring a starting battery to drive a starter motor, which in turn drives the generator set for starting.

[0030] Further, refer to Figure 1 Inverter 3 is connected to mode selection module 6, and can also be connected to photovoltaic power generation module and / or wind power generation module. Users can detect the voltage between power component 4 and inverter 3, the voltage between rectifier and voltage regulator module 31 and DC-AC inverter module 32, or the speed and load power of power component 4, and control whether DC-DC conversion module 33 charges and discharges energy storage battery 5, thereby selecting the corresponding mode according to the actual situation.

[0031] The emergency power system can operate in four modes for home emergency power needs. The mode selection module 6 allows users to choose between energy-saving mode, hybrid mode, generator mode, and energy storage mode. Customers can determine the appropriate mode based on their specific application scenario.

[0032] Specifically, in energy-saving mode, this scenario primarily uses the energy storage battery 5 to supply power to the load, while simultaneously monitoring the battery's charge level and load size. When the load power exceeds the set power or the energy storage battery 5's charge level reaches the set alarm value, the inverter 3 issues an alarm. An overload alarm is triggered, and the output is shut down. When the battery charge is low, the inverter 3 controls the reverse-drive control module 2, which drives the variable frequency motor 1 to generate electricity. At this time, the power unit 4 reverse-drives the variable frequency motor 1, and the inverter 3 switches the power output from the energy storage battery 5, using the variable frequency motor 1 to supply power to the load, with excess electricity charging the energy storage battery 5. When the energy storage battery 5 reaches the set protection point, the inverter 3 controls the power unit 4 to shut down. This mode function continues to cycle, thus controlling the generator set to its maximum efficiency point. This better utilizes energy and reduces traditional fuel consumption.

[0033] In hybrid mode, the system primarily uses variable frequency motor 1 for power replenishment. When a sudden drop in the speed of variable frequency motor 1 is detected, or when the rectifier voltage regulator module 31 falls below a certain value, the inverter 3 controls the DC-DC control module to supplement the power generation output with the energy storage battery 5. This design can be used for some power tool loads. This application scenario avoids the problem of conventional generators failing to start power tools, achieving strong overload resistance.

[0034] In generator mode, the functions of a traditional generator are retained, generating electricity using conventional energy sources. Simultaneously, the unit employs rectifier-inverter technology, designed to avoid the fixed relationship between the traditional generator output frequency and power speed. This allows for adjusting the power output speed to suit different loads, resulting in better energy utilization and reduced consumption of conventional fuels.

[0035] In energy storage mode, the primary method is to discharge the energy storage battery 5. Simultaneously, the photovoltaic power generation module and / or wind power generation module supply power to the DC-DC control module, and the inverter 3 can supply power to external systems. The photovoltaic and / or wind power generation modules can also charge the energy storage battery 5.

[0036] The above description of the embodiments is only used to provide a detailed introduction to the technical solution of this utility model. However, the description of the above embodiments is only for the purpose of helping to understand this utility model and should not be construed as a limitation of this utility model. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. An emergency power supply system, characterized in that, include: The variable frequency motor (1), the reverse drag control module (2), the inverter (3), the power component (4), and the energy storage battery (5) are connected; the rotor of the variable frequency motor (1) and the power component (4) are connected by transmission, and the output end of the variable frequency motor (1) and the input end of the inverter (3) are electrically connected; The anti-drag control module (2) is electrically connected to the variable frequency motor (1) and the inverter (3) respectively, and is also communicatively connected to the inverter (3); the inverter (3) is electrically connected to the power component (4) and the energy storage battery (5) respectively.

2. The emergency power supply system as described in claim 1, characterized in that, The inverter (3) includes a rectifier and voltage regulator module (31), a DC-AC inverter module (32), and a DC-DC converter module (33); the input terminal of the rectifier and voltage regulator module (31) is electrically connected to the output terminal of the variable frequency motor (1), and the rectifier and voltage regulator module (31) and the DC-AC inverter module (32) are connected in series; the DC-DC converter module (33) has three input and output terminals, one of which is electrically connected to the energy storage battery (5), another input and output terminal is electrically connected between the rectifier and voltage regulator module (31) and the DC-AC inverter module (32), and the last input and output terminal is electrically connected to the DC-AC inverter module (32); the reverse drag control module (2) is electrically connected between the rectifier and voltage regulator module (31) and the DC-DC converter module (33).

3. The emergency power supply system as described in claim 1 or 2, characterized in that, The inverter (3) is connected to a mode selection module (6), which is used to select the emergency power system's energy-saving mode, hybrid mode, and generator mode.

4. The emergency power supply system as described in claim 3, characterized in that, The inverter (3) is connected to a photovoltaic power generation module and / or a wind power generation module.

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