CN111740565A - A cascaded inverter integrated water cooling device - Google Patents

Abstract

The integrated water cooling device of the cascade inverter comprises an integrated water cooling plate, a connecting copper bar and a plurality of power unit modules, wherein an insulating heat-conducting conversion plate is fixed on a heat absorption surface of the integrated water cooling plate, the insulating heat-conducting conversion plate is made of ceramic materials, and the power unit modules are fixed on the insulating heat-conducting conversion plate; the position that does not set up insulating heat conduction change-over panel on the integral type water-cooling board covers has insulating guard plate, and the heat that power unit module work produced transmits for the integral type water-cooling board through insulating heat conduction change-over panel. According to the integrated water cooling device for the cascade inverter, the insulating heat conduction conversion plate made of the ceramic material is arranged, so that heat transfer is realized, the power unit module and the integrated water cooling plate are electrically isolated, cooling is performed by adopting common industrial cooling water without adopting deionized insulating water, the structure of the cooling device is simplified, the size of the cooling device is reduced, and the cost of the cooling device is reduced.

Description

A cascaded inverter integrated water cooling device

technical field

The invention relates to a water-cooling device for an inverter, and more particularly, to an integrated water-cooling device for cascaded inverters.

Background technique

Cascaded inverters are currently mainly used in industrial applications such as reactive power compensation generators and high-voltage inverters. Explosion-proof products and high-power products. Conventional water-cooled inverters mainly have the following problems:

1. The water-cooling system is complex and has poor reliability. The water-cooling control system and the cooling system are both complicated. The control system controls the operation and stop of various water pumps, detects the pressure of the water-cooling system, detects the conductivity of the internal cooling cycle, and detects the leakage protection function, etc. The water cooling system includes Pure water circulation loop, deionization loop, water replenishment loop and inverter heat dissipation loop, the above two systems are complex, the use of more components in the control system can easily lead to high device failure, the heat dissipation system has many water pipes, and many internal joints can easily lead to water leakage. , so the reliability of conventional water cooling is poor.

2. The conventional water-cooled inverter power unit modules are arranged separately. The unit has its own cooling water-cooling plate. The power device of the power unit module is directly installed on the radiator. After multiple power unit modules are connected in series, the voltage gradually increases. There is a potential difference. In order to avoid conduction due to the existence of the potential difference of the power unit, it is required that the cooling water must be deionized water with insulating properties. The water passing through the water cooling plate needs to be reduced by the water cooling system. The water cooling plate does not conduct electricity. In addition, the units are connected by water pipelines, so that the entire water pipeline occupies a large space and makes the whole set of equipment larger.

3. Cascading explosion-proof products place power unit modules inside the casing, and a water-cooled heat dissipation system needs to be added, which results in a large overall volume, inconvenient for underground operation, and poor reliability and does not meet the requirements of underground use.

4. High cost, conventional water cooling system cooling inverter water cooling system accounts for about 1/3 of the total cost, and the water cooling system cost is high.

The conventional cascade inverter water-cooled heat dissipation method has the problems of complex system reliability, low cost and large size. At present, the market competition of water-cooled inverters is becoming more and more fierce, and high reliability, low cost and small size are more favored by users. Therefore, it is particularly important for the cascaded inverter to have a safe and efficient cascaded inverter cooling system.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the above technical problems, the present invention provides an integrated water cooling device for cascaded inverters.

The integrated water-cooling device for cascaded inverters of the present invention includes an integrated water-cooling plate, connecting copper bars and a plurality of power unit modules. A water-cooling cavity is arranged inside the integrated water-cooling plate, and both ends of the integrated water-cooling plate are provided with The water inlet and outlet of the water-cooling cavity communicate with each other; it is characterized in that: the heat-absorbing surface of the integrated water-cooling plate is fixed with insulating and heat-conducting conversion plates equal to the number of the power unit modules, and the insulating and heat-conducting conversion plates are made of ceramic materials, and the power unit modules are made of ceramic materials. It is fixed on the insulating and heat-conducting conversion plate; the part of the integrated water-cooling plate that is not provided with the insulating and heat-conducting conversion plate is covered with an insulating protection plate, and the adjacent power unit modules are connected by connecting copper bars; the heat generated by the operation of the power unit module is converted by the insulating and heat-conducting conversion. The plate is transferred to the integrated water-cooling plate, and the cooling water circulating in the integrated water-cooling plate takes away the heat; the integrated water-cooling plate adopts ordinary industrial cooling water for cooling and heat exchange.

In the cascaded inverter integrated water cooling device of the present invention, the plurality of power unit modules are connected in series to form a reactive power generator circuit or a high-voltage inverter circuit, and a rectifier circuit module is provided at the input end of each power unit module in the high-voltage inverter circuit The input terminal of the rectifier circuit module is connected to the three-phase alternating current, the DC voltage formed by the output terminal is connected to both ends of the power unit module, and the inverter is realized by controlling the on-off of the IGBT device in the power unit module.

In the cascade inverter integrated water cooling device of the present invention, the insulating protective plate is made of insulating material made of rubber or plastic.

In the integrated water-cooling device for cascaded inverters of the present invention, a water-cooling channel is provided in the integrated water-cooling plate at each insulating and heat-conducting conversion plate. Walk.

In the integrated water cooling device for cascaded inverters of the present invention, the integrated water cooling plate is a door plate of an explosion-proof product casing.

The beneficial effects of the present invention are: the integrated water cooling device of the cascaded inverters of the present invention, by arranging an insulating and thermally conductive conversion plate of ceramic material between the power unit module and the integrated water cooling plate, not only realizes the conversion of the power unit module to the The heat is efficiently transferred to the integrated water-cooling plate for cooling and heat dissipation, and the electrical isolation of the power unit module and the integrated water-cooling plate is also realized, so that the integrated water-cooling plate can use ordinary industrial cooling water for cooling and heat exchange. In the same way, deionized insulating water must be used for cooling and heat exchange, so the cooling system does not need to set a deionization circuit, which simplifies the structure of the cooling device, reduces the volume of the cooling device, and reduces the cost of the cooling device.

By arranging multiple power unit modules on an integrated water-cooling plate for heat dissipation, the number of water-cooling plates is reduced. At the same time, water-cooling channels are arranged in the integrated water-cooling plate, which solves the problems of many conventional water-cooling pipes, many joints and water leakage, and reduces the The entire water-cooled volume is convenient for structural design and layout. By arranging an insulating protection plate on the part of the integrated water-cooling plate where the insulating and heat-conducting conversion plate is not arranged, the problem of insufficient electrical distance between the insulating protection plate and the integrated water-cooling plate due to the high voltage generated by the cascade connection of the power unit modules is solved, and the problem of insufficient electrical distance is further reduced. The set volume of the cascaded inverters.

Description of drawings

FIG. 1 is a perspective view of the cascade inverter integrated water cooling device of the present invention;

FIG. 2 is a front view of the cascade inverter integrated water cooling device of the present invention;

Fig. 3 is the circuit diagram of the main circuit of the reactive power compensation generator formed by the power unit module in the present invention;

Fig. 4 is the topological circuit diagram of the power unit module of the reactive power compensation generator in the present invention;

5 is a circuit diagram of a main circuit of a high-voltage inverter formed by a power unit module in the present invention;

FIG. 6 is a topological circuit diagram of a power unit module of a medium and high voltage inverter of the present invention.

In the picture: 1 power unit module, 2 connecting copper bars, 3 integrated water cooling plate, 4 insulating heat conduction conversion plate, 5 insulating protection plate, 6 water inlet, 7 water outlet.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 and FIG. 2 , a perspective view and a front view of the cascade-inverter-integrated water-cooling device of the present invention are respectively given. The connecting copper bar 2, the integrated water-cooling plate 3, the insulating and heat-conducting conversion plate 4 and the insulating protection plate 5 are composed. The water inlet 6 and the water outlet 7 are connected with each other. The cooling water enters the integrated water cooling plate 3 through the water inlet 6 to take away the heat emitted by the power unit module 1, and then discharges through the water outlet 7. The heat-absorbing surface of the integrated water-cooling plate 3 is fixed with a number of insulating and heat-conducting conversion plates 4, and the number of the insulating and heat-conducting conversion plates 4 is equal to the number of the power unit modules 1. In this way, each insulating and heat-conducting conversion plate 4 is fixed on a power The unit module 1 and the insulating and heat-conducting conversion plate 4 are made of ceramic materials.

The insulating and heat-conducting conversion plate 4 made of ceramic material can not only transfer the heat generated by the operation of the power unit module 1 to the integrated water-cooling plate 3 , but also ensure the insulation and electrical isolation between the power unit module 1 and the integrated water-cooling plate 3 . For the existing power unit module water cooling device, the power unit module is directly fixed to the water cooling plate, which makes the potential difference between each power unit module, which requires the cooling water to have insulating properties. of deionized water so as not to conduct electricity due to the presence of a potential difference. In the present invention, this problem is effectively solved by disposing an insulating and heat-conducting conversion plate 4 between the power unit module 1 and the integrated water-cooling plate 3, without using deionized water, and using ordinary industrial cooling water for cooling and replacing Just hot. Therefore, the whole cooling device does not need to be provided with a deionization device, which simplifies the structure of the cooling device and reduces the cost.

On the part of the heat-absorbing surface of the integrated water-cooling plate 3 that is not provided with the insulating and heat-conducting conversion plate 4, an insulating protective plate 5 is fixed, and the insulating protective plate 5 is made of an insulating material made of rubber or plastic. Although the voltage level of a single power unit module 1 is not high, after a certain number of power unit modules 1 are connected in series, the formed voltage level is very high, which requires the connection between the power unit module 1 and the integrated water-cooling plate 3 There is a large electrical distance, but the large electrical distance is not conducive to the miniaturization design of the integrated water cooling device of the inverter. The distance from the integrated water-cooling plate 3 is relatively short, but due to the insulation of the insulating protection plate 5, it is equivalent to increasing the electrical distance between the power unit module 1 and the integrated water-cooling plate 3, ensuring the safety of the power unit module 1. , Stable work.

It can be seen that since each integrated water-cooling plate 3 is provided with a plurality of insulating and heat-conducting conversion plates 4, multiple power unit modules 1 share one integrated water-cooling plate 3 for water cooling and heat dissipation, which reduces the number of integrated water-cooling plates 3 and simplifies piping layout. In the integrated water-cooling plate 3 , a water-cooling channel is provided at a position corresponding to each insulating and heat-conducting conversion plate 4 , and the water flowing through the water-cooling channel can efficiently take away the heat transferred by the insulating and heat-conducting conversion plate 4 . The one-piece water-cooling plate 3 is adopted, which solves the problems of many conventional water-cooling pipes, many joints and water leakage, and at the same time reduces the entire water-cooling volume and facilitates the structural design and layout.

As shown in FIG. 3 , the main circuit diagram of the reactive power compensation generator formed by the power unit module in the present invention is given. The n power unit modules 1 shown are connected in series to form the main circuit of the reactive power compensation generator. Among them, S-IUN1, S-IUN2, . , each power unit module 1 shown is composed of capacitor C1, capacitor C2, IGBT module U1, and IGBT module U2. Capacitor C1 and capacitor C2 play the role of voltage regulation and filtering. IGBT module U1 and IGBT module U2 are connected by two series connection. The IGBT device is formed together, and the inverter is realized by controlling the on-off of the IGBT device.

As shown in FIG. 5, the circuit diagram of the main circuit of the high-voltage inverter formed by the power unit module in the present invention is given. The main circuit of the high-voltage inverter shown is composed of n power unit modules provided with a three-phase rectifier circuit module. They are G-IUN1, G-IUN2, . As shown in FIG. 6 , the topology circuit diagram of the power unit module of the high-voltage inverter in the present invention is given, and the three-phase rectifier circuit module V1 shown is a three-phase full bridge composed of diodes D1, D2, D3, D4, D5, and D6. The rectifier circuit, the IGBT module U1 and the IGBT module U2 are both composed of two IGBT devices connected in series, and the inverter is realized by controlling the on-off of the IGBT devices.

The main circuit diagram of the cascaded inverter has 2 types of circuits, Figure 3 main circuit circuit of reactive power compensation generator, Figure 5 main circuit circuit of high voltage inverter; according to different product designs, choose different main circuit topology circuits and place them in the integrated water cooling On the board; according to different voltage levels and design requirements, different numbers of power unit modules can be placed on the water-cooling board of the all-in-one machine to form one-phase output. For example, for a 3.3kV high-voltage inverter, three low-voltage inverter units 1 are placed on the integrated water-cooling board to form a one-phase output.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention. Other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

Claims (5)

1. An integrated water cooling device of a cascade inverter comprises an integrated water cooling plate (3), a connecting copper bar (2) and a plurality of power unit modules (1), wherein a water cooling cavity is arranged inside the integrated water cooling plate, and a water inlet (6) and a water outlet (7) which are communicated with the water cooling cavity are arranged at two ends of the integrated water cooling plate; the method is characterized in that: insulating heat-conducting conversion plates (4) with the number equal to that of the power unit modules (1) are fixed on the heat absorption surface of the integrated water cooling plate (3), the insulating heat-conducting conversion plates are made of ceramic materials, and the power unit modules are fixed on the insulating heat-conducting conversion plates; the integrated water cooling plate is covered with an insulation protection plate (5) at the position where the insulation heat conduction conversion plate is not arranged, and adjacent power unit modules (1) are connected through a connecting copper bar; heat generated by the work of the power unit module is transferred to the integrated water-cooling plate through the insulating heat-conducting conversion plate, and the heat is taken away by cooling water circulating in the integrated water-cooling plate; the integrated water cooling plate adopts common industrial cooling water to carry out cooling and heat exchange.

2. The cascade inverter integrated water cooling device according to claim 1, characterized in that: a plurality of power unit modules (1) are connected in series to form a reactive generator circuit or a high-voltage frequency converter circuit, the input end of each power unit module (1) in the high-voltage frequency converter circuit is provided with a rectifying circuit module, the input end of each rectifying circuit module is connected to three-phase alternating current, direct current voltage formed by the output end is connected to two ends of each power unit module in a pressing mode, and inversion is achieved by controlling the on-off of an IGBT device in each power unit module.

3. The cascade inverter integrated water cooling device according to claim 1 or 2, characterized in that: the insulation protection plate (5) is made of an insulation material made of rubber or plastic.

4. The cascade inverter integrated water cooling device according to claim 1 or 2, characterized in that: and a water cooling channel is arranged in the integrated water cooling plate (3) at each insulating heat conduction conversion plate (4), and cooling water flowing through the water cooling channel takes away heat transferred by the insulating heat conduction conversion plates.

5. The cascade inverter integrated water cooling device according to claim 1 or 2, characterized in that: the integrated water cooling plate (3) is a door plate of an explosion-proof product shell.

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