Energy storage frequency converter

Abstract

The utility model relates to a kind of energy storage frequency converters, including host computer, the surface of host computer is equipped with control panel, the top area in host computer is equipped with high voltage box, DCDC is fixedly installed in high voltage box side, the bottom one end in host computer is equipped with multiple PACK, the bottom other end in host computer is equipped with liquid cooling unit, rectifier is installed in liquid cooling unit side, the utility model integrates energy storage and frequency conversion function, can charge in valley electricity period, discharge in peak electricity period, reduce electricity cost;Output frequency and voltage are automatically regulated by PID control, improve operating efficiency;Adopt liquid cooling, adapt to harsh environment;With power outage cruising ability, guarantee critical equipment continuous operation, with energy saving, efficient, reliable and the like advantages.

Description

Technical Field

[0001] This utility model relates to the field of energy storage frequency conversion, specifically an energy storage frequency converter. Background Technology

[0002] A frequency converter is a control device that uses the switching action of power semiconductor devices to convert mains frequency power into electrical energy of other frequencies to regulate the speed and torque of a motor. Typically, a frequency converter is connected between the three-phase AC input of the power grid and the load motor, which drives various mechanical loads. Because the power requirements of the load vary significantly under different operating conditions (such as locomotive starting, braking, acceleration, and deceleration), the frequency of the frequency converter's output voltage needs to be adjusted in real time to match the motor speed, thereby achieving energy saving and stable operation.

[0003] However, traditional frequency converters can only operate continuously when the mains power supply is normal or an emergency DC power supply is available. Once the power supply network fails or the system itself malfunctions and loses power, the frequency converter loses its driving capability, and the motor equipment will immediately stop running. In certain situations where there are strict requirements for continuous power supply (such as areas with large peak and off-peak electricity price differences, hospitals, communication base stations and other equipment that cannot be powered off, mines, oil fields, remote areas and other places with unstable power supply, fans, water pumps and other industrial equipment that have not been upgraded with frequency converters and have large electricity price differences), if backup energy switching or energy storage protection measures are not taken in time, it will not only lead to production interruption, but may also cause equipment damage, safety accidents or significant economic losses. Therefore, we propose an energy storage frequency converter. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, adapt to practical needs, and provide an energy storage frequency converter to solve the problem that current traditional frequency converters can only operate continuously when the mains power supply is normal or an emergency DC power supply is connected; once the power supply network fails or the system itself loses power, the frequency converter loses its driving capability, and the motor equipment will immediately stop running. In some situations with strict requirements for continuous power supply (such as rail transit, metallurgy, chemical production lines, etc.), if backup energy switching or energy storage protection measures are not taken in time, it will not only lead to production interruption, but may also cause equipment damage, safety accidents, or significant economic losses.

[0005] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: design an energy storage frequency converter, including a main unit, a control panel installed on the surface of the main unit, a high-voltage box installed in the top area inside the main unit, a DC-DC converter fixedly installed on the side of the high-voltage box, multiple PACKs installed at one bottom end inside the main unit, a liquid cooling unit installed at the other bottom end inside the main unit, and a rectifier installed on the side of the liquid cooling unit.

[0006] Preferably, the rectifier includes a filter and a PWM rectifier unit for filtering out noise from the input power grid and converting AC power into DC power.

[0007] Preferably, the DC-DC converter is used to enable bidirectional energy flow between the low-voltage side and the high-voltage side of the system, and to maintain the DC bus voltage within a set range.

[0008] Preferably, the PACK is composed of multiple individual battery cells connected in series and parallel to form a battery module.

[0009] Preferably, the high-voltage box is an intermediate unit connecting the battery cluster and the energy storage converter.

[0010] Preferably, the host is further provided with a frequency converter module for controlling the speed and torque of the AC motor, and achieving precise control by adjusting the output voltage and frequency.

[0011] Preferably, the top of the main unit is equipped with an exhaust shroud for auxiliary heat dissipation.

[0012] Preferably, a junction box is installed on the side of the host, and the junction box is provided with output terminals and input terminals.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model can automatically charge during off-peak hours and release electrical energy during peak hours, utilize electricity price differences for energy scheduling and frequency regulation, reduce peak electricity costs, and achieve multi-faceted savings in electricity expenditure.

[0015] 2. This utility model adopts an integrated structure of energy storage and frequency conversion, which reduces on-site wiring and floor space, facilitates on-site handling, installation and subsequent expansion, shortens the commissioning cycle and reduces project investment costs.

[0016] 3. This utility model is based on real-time load and power grid status detection, combined with PID, to automatically adjust the output frequency and voltage, so that the motor always runs at the most energy-efficient and stable operating point.

[0017] 4. This utility model can flexibly set multiple peak, flat, and valley electricity price periods, realize compatibility and switching of electricity prices in different regions, and meet the needs of electricity price optimization in multiple time periods and across regions.

[0018] 5. This utility model adopts liquid cooling to ensure that the main power devices operate stably and reliably in harsh environments such as high temperature and high humidity.

[0019] 6. The built-in energy storage PACK of this utility model can continue to provide backup power to the load equipment for at least 3 hours when the mains power fails or malfunctions, avoiding the risk of interruption of critical processes and equipment downtime. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a side view of the structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the junction box structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the wiring terminals of this utility model;

[0025] In the diagram: 1. Main unit; 2. Control panel; 3. Exhaust hood; 4. Junction box; 5. Output terminal block; 6. Input terminal block; 7. High voltage box; 8. DC-DC converter; 9. Rectifier; 10. Liquid cooling unit; 11. PACK. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Example 1: An energy storage frequency converter, see [link to example]. Figures 1 to 5 The system includes a main unit 1, a control panel 2 mounted on the surface of the main unit 1, a high-voltage box 7 mounted in the top area inside the main unit 1, a DC-DC converter 8 fixedly mounted on the side of the high-voltage box 7, multiple PACKs 11 mounted at one bottom end inside the main unit 1, a liquid cooling unit 10 mounted at the other bottom end inside the main unit 1, and a rectifier 9 mounted on the side of the liquid cooling unit 10.

[0028] For details, see Figure 1 and Figure 4 The rectifier 9 includes a filter and a PWM rectifier unit, which are used to filter out noise from the input power grid and convert AC power into DC power.

[0029] First, the AC power is connected to the three-phase AC power grid through the junction box 4 on the side of the main unit 1. The AC power is first filtered out by the rectifier 9 (including filter and PWM rectifier unit) installed on the side of the liquid cooler unit 10 to remove noise and is rectified into DC power to form a DC bus.

[0030] For more details, see Figure 1 and Figure 4 The DC-DC8 is used to enable bidirectional energy flow between the low-voltage side and the high-voltage side of the system, and to maintain the DC bus voltage within a set range.

[0031] The DC-DC-8 module is connected in parallel between the DC bus and battery PACK11. Based on commands from the system controller (using a PID algorithm), it activates boost / buck conversion during off-peak hours to charge and store energy in PACK11. During peak hours or periods of sudden load increases, it discharges in reverse, injecting the energy stored in PACK11 into the DC bus via the DC-DC-8 module.

[0032] Further, see Figure 1 and Figure 4 PACK11 is composed of multiple individual cells connected in series and parallel to form a battery module.

[0033] Further, see Figure 1 and Figure 4 The high-voltage box 7 is an intermediate unit connecting the battery cluster and the energy storage converter.

[0034] It is worth noting that, see Figure 1 and Figure 4 The main unit 1 is also equipped with a frequency converter module, which is used to control the speed and torque of the AC motor and achieves precise control by adjusting the output voltage and frequency.

[0035] After the DC bus voltage stabilizes, the frequency converter module inverts the DC power into AC power of the required frequency and amplitude, and outputs it to the motor to achieve precise control of the motor speed and torque.

[0036] It is worth noting that, see Figure 1 The top of the main unit 1 is equipped with an exhaust shroud 3 for auxiliary heat dissipation.

[0037] During operation, the liquid cooling unit 10 continuously cools the PACK11, high-voltage box 7 and power semiconductor devices. The exhaust hood 3 and control panel 2 work together to achieve real-time monitoring and heat dissipation of temperature and operating status, ensuring that the equipment can perform energy storage and frequency conversion integration work efficiently and reliably under various operating conditions.

[0038] It is worth mentioning that, see Figure 2 and Figure 5 The main unit 1 has a junction box 4 installed on its side. The junction box 4 has an output terminal 5 and an input terminal 6 inside.

[0039] When using an energy storage inverter, it is first connected to the three-phase AC power grid through the junction box 4 on the side of the main unit 1. The AC power is first filtered by the rectifier 9 (including a filter and a PWM rectifier unit) installed on the side of the liquid-cooled unit 10 to remove noise and rectify it into DC power, forming a DC bus. The DC-DC converter 8 module is connected in parallel between the DC bus and the battery PACK11. According to the instructions issued by the system controller (with PID algorithm), the boost / buck converter is activated during off-peak hours to charge and store energy in PACK11; during peak hours or periods of sudden load increase, it discharges in reverse to charge the PACK11. The stored energy is injected into the DC bus through DC-DC converter 8. After the DC bus voltage stabilizes, the frequency converter module (inverter bridge and vector control unit) inverts the DC power into AC power of the required frequency and amplitude and outputs it to the motor to achieve precise control of the motor speed and torque. During operation, the liquid cooling unit 10 continuously performs thermal management on PACK11, high voltage box 7 and power semiconductor devices. The exhaust hood 3 and control panel 2 work together to achieve real-time monitoring and heat dissipation of system temperature and operating status, ensuring that the equipment can perform energy storage and frequency conversion integration work efficiently and reliably under various operating conditions.

[0040] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

Claims

1. An energy storage frequency converter, comprising a main unit (1), wherein a control panel (2) is mounted on the surface of the main unit (1), characterized in that, A high-voltage box (7) is installed in the top area of ​​the host (1), and a DC-DC converter (8) is fixedly installed on the side of the high-voltage box (7). Multiple PACKs (11) are installed at one bottom end of the host (1), and a liquid cooling unit (10) is installed at the other bottom end of the host (1). A rectifier (9) is installed on the side of the liquid cooling unit (10).

2. The energy storage frequency converter as described in claim 1, characterized in that, The rectifier (9) includes a filter and a PWM rectifier unit for filtering out noise from the input power grid and converting AC power into DC power.

3. The energy storage frequency converter as described in claim 1, characterized in that, The DC-DC converter (8) is used to enable bidirectional energy flow between the low-voltage end and the high-voltage end of the system, and to maintain the DC bus voltage within a set range.

4. The energy storage frequency converter as described in claim 1, characterized in that, The PACK (11) is composed of multiple individual cells connected in series and parallel to form a battery module.

5. The energy storage frequency converter as described in claim 1, characterized in that, The high-voltage box (7) is an intermediate unit connecting the battery cluster and the energy storage converter.

6. The energy storage frequency converter as described in claim 1, characterized in that, The host (1) is also equipped with a frequency converter module, which is used to control the speed and torque of the AC motor and achieve precise control by adjusting the output voltage and frequency.

7. The energy storage frequency converter as described in claim 1, characterized in that, The host (1) is equipped with an exhaust shroud (3) on top for auxiliary heat dissipation.

8. The energy storage frequency converter as described in claim 1, characterized in that, The host (1) is equipped with a junction box (4) on its side. The junction box (4) is provided with an output terminal (5) and an input terminal (6).

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