CN114883930A - Reactive compensation complete cabinet with high power saving efficiency and implementation method thereof - Google Patents

Abstract

The invention belongs to the technical field of reactive power compensation devices, and provides a complete set of reactive power compensation cabinets with high power saving efficiency, comprising a cabinet body, an instrument module located on the upper part of the cabinet body, and a plurality of integrated types arranged along the longitudinal direction of the cabinet body. A low-voltage reactive power compensation module, a central processing unit that communicates with the integrated low-voltage reactive power compensation module, a control circuit breaker controlled by the central processing unit and corresponding to the integrated low-voltage reactive power compensation module, and distributed A type of heat dissipation mechanism; wherein, a partition is arranged between adjacent integrated low-voltage reactive power compensation modules, and the inductance parameters of each integrated low-voltage reactive power compensation module are different. The present invention adopts a modular design concept and is combined with an integrated low-voltage reactive power compensation module to ensure the normal operation of the entire reactive power compensation device and improve the power saving efficiency of the reactive power compensation device.

Description

A complete set of reactive power compensation cabinet with high power saving efficiency and its realization method

technical field

The invention belongs to the technical field of reactive power compensation devices, and in particular relates to a reactive power compensation complete cabinet with high power saving efficiency and a realization method thereof.

Background technique

Reactive power compensation plays a role in improving the power factor of the power grid in the power supply system. It is mainly used to reduce the loss of power supply transformers and transmission lines, improve power supply efficiency, and improve power supply environment. The complete set of reactive power compensation cabinet is a conventional reactive power compensation device and is widely used in substations, power plants, enterprises and other scenarios. Compensation modules, etc., in practical applications, there are mainly the following technical problems: (1) The inrush current of the input capacitor bank is relatively large; (2) The components are distributed in many points, which leads to the mess in the cabinet; (3) The inductance parameters are fixed, if the field When the operation of the power grid changes, the effect of the entire reactive power compensation device becomes worse or even cannot be used.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a complete set of reactive power compensation cabinets with high power saving efficiency, so as to solve the technical problems existing in the existing reactive power compensation devices.

In order to achieve the above object, the technical scheme adopted by the present invention is as follows:

A complete set of reactive power compensation cabinets with high power saving efficiency, comprising a cabinet body, an instrument module located on the upper part of the cabinet body, a plurality of integrated low-voltage reactive power compensation modules arranged longitudinally along the cabinet body, and the integrated low-voltage reactive power compensation modules. A central processing unit for communication with the reactive power compensation module, a control circuit breaker controlled by the central processing unit and corresponding to the integrated low-voltage reactive power compensation module one-to-one, and a distributed cooling mechanism; wherein, the adjacent integrated low-voltage A partition is set between the reactive power compensation modules, and the inductance parameters of each integrated low-voltage reactive power compensation module are different.

Further, the integrated low-voltage reactive power compensation module includes a housing, a reactive power compensation controller arranged on the housing, a signal sampling module connected to the bus, a fuse connected to the signal sampling module, and a fuse connected to the signal sampling module. A switching switch connected with the fuse, a filter inductor connected with the switching switch, a capacitor bank connected with the filter inductor, and a communication module communicating with the central processing unit.

Further, the capacitor bank includes three capacitors and is connected with the filter inductor in a delta connection.

Further, the signal sampling module includes a current transformer and a voltage transformer.

Further, the reactive power compensation controller includes a control module and a signal monitoring module, and the signal monitoring module communicates with the central processing unit through the communication module.

Further, the distributed heat dissipation mechanism includes a heat dissipation air duct arranged on the back of the cabinet body, a heat dissipation ventilation hole located at the bottom of the cabinet body and communicated with the heat dissipation air duct, and is connected with each of the integrated low-voltage air ducts. The power compensation modules correspond to the cooling fans one-to-one and are controlled by the central processing unit, and all the cooling fans share a cooling air duct.

Further, the separator is made of thermally conductive material.

The present invention also provides a method for realizing the above-mentioned reactive power compensation complete cabinet with high power saving efficiency, which is characterized in that it includes the following steps:

(1) According to the original operation of the power grid, the central processing unit calls the matching integrated low-voltage reactive power compensation module to work, the corresponding control circuit breaker is closed, and the control circuit breakers corresponding to other integrated low-voltage reactive power compensation modules are disconnected. Start the corresponding cooling fan;

(2) The reactive power compensation controller collects the operating parameters of the power grid during on-site operation and feeds it back to the central processing unit;

(3) The central processor calculates the matching inductance parameters according to the received operating parameters;

(4) Compare whether the calculated inductance parameters are compatible with the inductance parameters of the current integrated low-voltage reactive power compensation module; if so, do not act; if not, go to the next step;

(5) Disconnect the control circuit breaker corresponding to the current integrated low-voltage reactive power compensation module, turn off the corresponding cooling fan, call the matching integrated low-voltage reactive power compensation module to work and close the matching control circuit breaker, and at the same time, start the corresponding control circuit breaker. cooling fan.

Further, the operating parameters in the step (2) include reactive power compensation, bus power factor, bus harmonic information, and current inductance parameters.

Further, in the step (5), closing the corresponding cooling fan adopts a delayed closing method.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention is based on the design of a complete set of cabinets, and the integrated low-voltage reactive power compensation module is integrated and arranged, and the modular design concept is adopted to avoid the multi-point distribution of components in the cabinet existing in the existing reactive power compensation cabinet, resulting in a messy cabinet. The problem.

(2) In the present invention, the capacitor bank includes three capacitors, which are connected with the filter inductance in a delta connection, which can not only lower the influx of harmonic current to a certain extent, prevent various problems caused by the internal short circuit of the capacitor, but also have a good compensation effect. , Simple wiring, low cost, can reduce the overvoltage operation to a certain extent, and reduce the inrush current of the input capacitor bank.

(3) The inductance parameters of each integrated low-voltage reactive power compensation module in the present invention are different, which can cover the current mainstream reactive power compensation devices of various inductance parameters. The adapted integrated low-voltage reactive power compensation module is called in time, thereby ensuring the normal operation of the entire reactive power compensation device and improving the power saving efficiency of the reactive power compensation device.

(4) According to the modular design concept, the present invention adopts a distributed heat dissipation mechanism, and implements the concept of who works and who dissipates heat, which avoids the problem of poor heat dissipation target caused by the unsuitable heat dissipation method of the modular design, and the heat dissipation effect is better.

Description of drawings

FIG. 1 is a schematic structural diagram 1 of the present invention.

FIG. 2 is a schematic structural diagram 1 of the present invention.

FIG. 3 is a principle block diagram of the present invention.

FIG. 4 is a schematic block diagram of an integrated low-voltage reactive power compensation module in the present invention.

FIG. 5 is a schematic diagram of the wiring of the capacitor bank and the filter inductor in the present invention.

Among them, the names of the parts corresponding to the marks in the attached drawings: 1-cabinet, 2-instrument module, 3-integrated low-voltage reactive power compensation module, 4-control circuit breaker, 5-central processing unit, 6-partition, 7- Cooling air duct, 8- Cooling vent, 9- Cooling fan, 10- Capacitor, 11- Filter inductor.

Detailed ways

In order to make those skilled in the art have a clearer understanding and understanding of the present invention, the present invention will be further described in detail below with reference to the embodiments. It should be known that the specific embodiments described below are only used to explain the present invention, and it is convenient to understand that the technical solutions provided by the present invention are not limited to the technical solutions provided by the following embodiments. Nor should it limit the scope of protection of the present invention.

Example

As shown in Figures 1 to 5, this embodiment provides a complete set of reactive power compensation cabinets with high power saving efficiency. The complete set of reactive power compensation cabinets adopts a modular design concept, with the cabinet body as the main carrier, and the upper part of the cabinet body is provided with The instrument module is used to display the working information of the equipment (for example: reactive power compensation, bus power factor, bus harmonic information, current inductance parameters), and a power interface is integrated on the cabinet (not shown in the figure) and communication interface (not shown in the figure), which belong to the existing conventional structure, and will not be repeated here; in this embodiment, a number of partitions are arranged at intervals inside the cabinet, and the partitions are preferably made of thermally conductive materials to improve the performance of the Heat dissipation effect; a device placement cavity is formed between the adjacent partitions, and an integrated low-voltage reactive power compensation module is set in the device placement cavity. The inductance parameters are optional 4%, 5%, 6%...N%.

In this embodiment, a central processing unit is also provided, and the central processing unit communicates with all the integrated low-voltage reactive power compensation modules. Each integrated low-voltage reactive power compensation module is provided with a control circuit breaker corresponding to each other, and the control circuit breaker is controlled by the central processor control. Through the above settings, when the on-site operation of the power grid changes, the central processing unit can call the adapted integrated low-voltage reactive power compensation module in time, thereby ensuring the normal operation of the entire reactive power compensation device and improving the efficiency of the reactive power compensation device. electrical efficiency.

In this embodiment, the integrated low-voltage reactive power compensation module includes a housing, a reactive power compensation controller arranged on the housing, a signal sampling module connected to the bus, a fuse connected to the signal sampling module, and a fuse connected to the fuse. A switching switch, a filter inductor connected with the switching switch, a capacitor bank connected with the filter inductor, and a communication module communicating with the central processing unit. Among them, the signal sampling module includes a current transformer and a voltage transformer, which are used to collect the current signal and the voltage signal of the power supply bus.

In this embodiment, the reactive power compensation controller includes a control module and a signal monitoring module, the signal monitoring module communicates with the central processing unit through the communication module, and the signal monitoring module is used to monitor the collected bus current and voltage signals, filter inductors, capacitor banks, The working parameters of the switching switch, etc. are fed back to the control module and the central processing unit, the control module implements control according to the relevant parameters, and the central processing unit performs data processing according to the received relevant working parameters.

In this embodiment, the capacitor bank includes three capacitors and is connected to the filter inductor in a delta connection. The above arrangement has the following advantages: good compensation effect, simple wiring, low cost, overvoltage operation can be reduced to a certain extent, and the input capacitor can be reduced. Group of currents.

The traditional heat dissipation structure is not suitable for the modular design structure of the reactive power compensation complete cabinet in this embodiment, and its heat dissipation pertinence is poor. Therefore, this embodiment adopts a distributed heat dissipation mechanism with strong pertinence, and its specific structure is as follows: Including the cooling air duct set at the back of the cabinet, the cooling ventilation holes located at the bottom of the cabinet and communicating with the cooling air duct, and the cooling fan corresponding to each integrated low-voltage reactive power compensation module and controlled by the central processing unit, all The cooling fans share a cooling air duct, wherein the cooling fans are preferably miniature cooling fans. Through the above settings, the heat dissipation risk corresponding to the working integrated low-voltage reactive power compensation module is turned on, and the rest are turned off, thereby achieving the heat dissipation purpose of whoever works and the heat dissipation. The heat dissipation is more targeted and the effect is better.

The present embodiment also provides a method for realizing the above-mentioned reactive power compensation complete cabinet with high power saving efficiency, including the following steps:

Step 1: According to the original operation of the power grid, the central processing unit calls the matching integrated low-voltage reactive power compensation module to work, the corresponding control circuit breaker is closed, and the control circuit breakers corresponding to other integrated low-voltage reactive power compensation modules are disconnected. Start the corresponding cooling fan.

In step 2, the reactive power compensation controller collects the operating parameters of the power grid on-site operation and feeds them back to the central processing unit; wherein, the operating parameters include reactive power compensation amount, bus power factor, bus harmonic information, and current inductance parameters.

Step 3, the central processing unit calculates the matching inductance parameters according to the received operating parameters.

Step 4: Compare whether the calculated inductance parameters are compatible with the inductance parameters of the current integrated low-voltage reactive power compensation module; if so, do not act; if not, go to the next step;

Step 5: Disconnect the control circuit breaker corresponding to the current integrated low-voltage reactive power compensation module, turn off the corresponding cooling fan, call the matching integrated low-voltage reactive power compensation module to work and close the matching control circuit breaker, and at the same time, start the corresponding control circuit breaker. As a further preferred solution, in this step, the corresponding cooling fan is turned off by a delayed shutdown method.

The above are the preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the design principles and technical solutions of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims (10)

1. A reactive compensation complete cabinet with high electricity saving efficiency is characterized by comprising a cabinet body (1), an instrument module (2) positioned at the upper part of the cabinet body (1), a plurality of integrated low-voltage reactive compensation modules (3) longitudinally arranged along the cabinet body (1), a central processing unit (5) communicated with the integrated low-voltage reactive compensation modules (3), control circuit breakers (4) controlled by the central processing unit (5) and corresponding to the integrated low-voltage reactive compensation modules (3) one by one, and a distributed heat dissipation mechanism; wherein, set up baffle (6) between adjacent integrated form low pressure reactive compensation module (3), and the inductance parameter of every integrated form low pressure reactive compensation module (3) is different.

2. The reactive power compensation complete cabinet with high power saving efficiency according to claim 1, characterized in that: integrated form low pressure reactive compensation module (3) are in including the casing, set up reactive compensation controller on the casing, the signal sampling module who is connected with the generating line, with the fuse that signal sampling module is connected, with the fling-cut switch that the fuse is connected, with the filter inductance that the fling-cut switch is connected, with the capacitor bank that filter inductance is connected, and with the communication module of central processing unit communication.

3. The reactive power compensation complete cabinet with high power saving efficiency according to claim 2, characterized in that: the capacitor bank comprises three capacitors (10) and is connected with the filter inductor (11) in a triangular mode.

4. The complete reactive compensation cabinet set with high power saving efficiency according to claim 3, characterized in that: the signal sampling module comprises a current transformer and a voltage transformer.

5. The reactive power compensation complete cabinet with high power saving efficiency according to claim 4, characterized in that: the reactive compensation controller comprises a control module and a signal monitoring module, and the signal monitoring module is communicated with the central processing unit through the communication module.

6. The reactive power compensation complete cabinet with high power saving efficiency according to claim 5, characterized in that: the distributed heat dissipation mechanism comprises a heat dissipation air duct (7) arranged at the back of the cabinet body (1), heat dissipation air vents (8) communicated with the heat dissipation air duct (7) and the integrated low-voltage reactive compensation modules (3) and heat dissipation fans (9) controlled by the central processing unit (5), wherein the heat dissipation air ducts (7) are arranged at the bottom of the cabinet body (1) and are shared by all the heat dissipation fans (9).

7. The reactive power compensation complete cabinet with high power saving efficiency according to claim 6, characterized in that: the partition plate (6) is made of heat conducting materials.

8. The method for realizing the reactive compensation complete cabinet with high electricity-saving efficiency according to any one of claims 1 to 7, characterized by comprising the following steps:

(1) according to the original operation condition of the power grid, the central processing unit calls the matched integrated low-voltage reactive compensation modules to work, the corresponding control circuit breakers are closed, the control circuit breakers corresponding to other integrated low-voltage reactive compensation modules are opened, and meanwhile, the corresponding cooling fans are started;

(2) the reactive compensation controller collects the operation parameters of the power grid during field operation and feeds the operation parameters back to the central processing unit;

(3) the central processing unit calculates matched inductance parameters according to the received operation parameters;

(4) comparing the calculated inductance parameter with the inductance parameter of the current integrated low-voltage reactive compensation module to determine whether the calculated inductance parameter is matched with the inductance parameter of the current integrated low-voltage reactive compensation module; if yes, no action is carried out, and if not, the next step is executed;

(5) and disconnecting the control circuit breaker corresponding to the current integrated low-voltage reactive compensation module, closing the corresponding cooling fan, calling the matched integrated low-voltage reactive compensation module to work, closing the control circuit breaker matched with the matched integrated low-voltage reactive compensation module, and starting the corresponding cooling fan.

9. The method for realizing the reactive power compensation complete cabinet with high electricity saving efficiency according to claim 8, wherein the operation parameters in the step (2) comprise reactive power compensation amount, bus power factor, bus harmonic information and current inductance parameters.

10. The method for realizing the reactive power compensation complete cabinet with high electricity saving efficiency according to claim 9, wherein the corresponding cooling fan is turned off in the step (5) in a delayed turn-off manner.

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