CN201528206U - A Harmonic Suppression Type High Voltage Dynamic Reactive Power Automatic Compensation Device - Google Patents

Abstract

The harmonic suppression type high-voltage dynamic reactive power automatic compensation device provided by the utility model includes a controller, a sampling current transformer, a voltage transformer, a protective current transformer, and a high-voltage AC permanent magnet synchronous switching switch respectively connected to the controller. The controller includes a MCU microprocessor control unit and a GPRS network communication unit. The GPRS network communication unit is provided with a communication interface. The cooperation between the MCU microprocessor control unit and the GPRS network communication unit can realize the voltage and reactive power operation of the installation point For dynamic compensation of working conditions, the high-voltage AC permanent magnet synchronous switch is also connected to a filter reactor for harmonic suppression. The synchronous switch is located at the front end of the filter reactor and the shunt capacitor, and the filter reactor is connected to a shunt capacitor. It solves the technical problem that the high-voltage shunt capacitor reactive power compensation device cannot overcome the harm to the power grid and equipment caused by the harmonics on the high-voltage line in the actual operation process. It has the advantages of convenient maintenance and so on.

Description

A Harmonic Suppression Type High Voltage Dynamic Reactive Power Automatic Compensation Device

technical field

The utility model relates to an electric device, in particular to a harmonic suppression type high-voltage dynamic reactive power automatic compensation device.

Background technique

With the increase of power distribution system load and the improvement of power supply quality requirements, the demand for reactive power compensation also increases accordingly. At present, the reactive power compensation of my country's distribution network is usually carried out on the low-voltage side of the distribution transformer (0.4kV side), but the total investment is high, and the reactive power of distribution transformers, power distribution and high-voltage loads cannot be compensated. In the centralized compensation mode of the substation, the overall reactive power deficit is relatively large, and due to the large difference in load between seasons and day and night, the compensation is seriously insufficient during peak hours. Therefore, it is very necessary to carry out reactive power compensation in high voltage distribution lines.

At present, in some areas of our country, the high-voltage reactive power compensation of the line is scattered and installed on the line, which has the following shortcomings:

1) The existing reactive power compensation device does not have a certain proportion of reactors inside, which cannot overcome the harm of the harmonics on the high-voltage line to the power grid and equipment. In order to compensate the reactive power on the high-voltage line, the usual practice is to connect the high-voltage line in parallel Capacitor bank of appropriate capacity. However, if excessive harmonic currents appear on the high-voltage line due to the presence of harmonic sources (such as thyristor control equipment, electric arc furnaces, rolling mills, etc.), the capacitors are easily affected by harmonic currents due to their own reasons and cause damage. , or even destroy. In addition, the capacitor may interact with the system inductance to generate parallel resonance, and once the parallel resonance occurs, the existing harmonic current on the high-voltage line will be further amplified, thereby giving the capacitor itself and the device switching other equipment connected to the high-voltage line cause more damage.

2) High cost: Since each part operates outdoors, the required insulation level is higher than that of indoor components, so the corresponding investment is large. Reliability is not high: due to external components, the impact of the environment is relatively large .

3) The control method is single, only a single group of switching can not be dynamically graded and finely compensated.

4) The degree of intelligence is not high, and the automatic control of capacitor switching cannot be achieved, and the utilization force is too low to transmit data remotely through the wireless network GPRS.

Contents of the invention

The purpose of this utility model is to provide a harmonic suppression type high-voltage dynamic reactive power automatic compensation device, which solves the problem that the high-voltage shunt capacitor reactive power compensation device in the background technology cannot overcome the harm to the power grid and equipment caused by the harmonics on the high-voltage line during the actual operation process technical issues.

The technical solution of the utility model is:

A harmonic suppression type high-voltage dynamic reactive power automatic compensation device, including a controller, a sampling current transformer, a voltage transformer, a protective current transformer, and a high-voltage AC permanent magnet synchronous switching switch respectively connected to the controller. The device includes a MCU microprocessor control unit and a GPRS network communication unit, the GPRS network communication unit is provided with a communication interface, and the cooperation between the MCU microprocessor control unit and the GPRS network communication unit can realize the voltage and reactive power operation of the installation point Dynamic compensation of the condition,

Its special feature is that the high-voltage AC permanent magnet synchronous switch is also connected to a filter reactor for harmonic suppression, the synchronous switch is located at the front end of the filter reactor and the shunt capacitor, and the filter reactor is connected to a shunt capacitor .

The above-mentioned protective current transformer mainly collects capacitor current and protects the capacitor from overcurrent.

The above fuses are drop-out fuses.

The above arrester is a zinc oxide arrester.

The above sampling current transformer is an open current transformer.

The above-mentioned controller, voltage transformer, protective current transformer, high-voltage AC permanent magnet synchronous switch, filter reactor, and parallel capacitor are all placed in a box.

The above-mentioned box body includes a wall-piercing bushing, and the wall-piercing bushing is connected in parallel with the three phases of 10KVA, B, and C, and then connected to the voltage transformer inside the box.

The above-mentioned box body is a stainless steel or cold-rolled steel plate box body.

The utility model has the advantages of:

1] This series of products can have the function of harmonic suppression. The use of internal reactors can realize the dual functions of filtering and reactive power compensation. At the same time, it can limit the inrush current when the capacitor is connected to the power grid, and effectively suppress the fifth, seventh and higher harmonics of the power grid. enlarge.

2] Provides a variety of compensation control methods. Users can choose the most appropriate control method according to the installation point voltage and reactive power operating conditions to achieve the best energy-saving and loss-reducing effect

3] The device is small in size, simple in installation, high in reliability and easy in maintenance. The software is easy to operate and has a friendly display interface. This device is suitable for 10kV and 6kV grid lines.

4] The device has the function of analyzing and counting the operation data of the power grid, and can store the whole point records of the last two months and nearly 100 switching records

5] The device realizes graded, multi-stage constant volume or unequal volume switching, making high-voltage reactive power compensation more refined

6] The device adopts intelligent communication control, and can realize remote control, remote measurement and remote adjustment through GPRS and wireless communication modules.

Description of drawings

Fig. 1 is a schematic diagram of the utility model;

Fig. 2 is a structural representation of the utility model;

Description of reference numerals: 1-controller, 101-MCU microprocessor control unit, 102-GPRS network communication unit, 103-communication interface, 2-sampling current transformer, 3-voltage transformer, 4-protective current transformer Device, 5-high-voltage AC permanent magnet synchronous switch, 6-fuse, 7-lightning arrester, 8-box, 9-wall bushing, 10-filter reactor, 11-parallel capacitor.

Detailed ways

Referring to Figure 1, a harmonic suppression type high-voltage dynamic reactive power automatic compensation device includes a controller 1, a sampling current transformer 2, a voltage transformer 3, a protective current transformer 4, and a synchronous switching Switch 5, wherein controller 1 comprises MCU microprocessor control unit 101 and GPRS network communication unit 102, described GPRS network communication unit 102 is provided with a communication interface 103, described MCU microprocessor control unit 101 and GPRS network communication unit 102 The cooperation can realize dynamic compensation for the installation point voltage and reactive power operating conditions. The MCU microprocessor control unit 101 is operated by a digital signal processor TMS320F2812. The controller 1 makes judgments based on the real-time data collected from the power grid, and reasonably issues control commands to the high-voltage AC permanent magnet synchronous switch 5 to complete the switching of capacitors and realize dynamic compensation for the installation point voltage and reactive power operating conditions. The synchronous switch 5 is also connected to a filter reactor 10 for harmonic suppression, the synchronous switch 5 is located at the front end of the protection filter reactor 10 and the parallel capacitor 11 , and the filter reactor 10 is also connected to a parallel capacitor 11 . The capacitor loop is connected in series with a certain proportion of reactors, which can effectively reduce the closing inrush current when the capacitor is switched on, increase the service life of the equipment, and at the same time inhibit the amplification of the line harmonic current and reduce the harmonic pollution to the power grid. The dropout fuse provides short-circuit protection for the entire device. If a short-circuit fault occurs in the device, the drop-out fuse will be blown immediately to prevent the short-circuit fault from causing harm to the device and the circuit. Wherein the arrester 7 is a zinc oxide arrester.

Referring to FIG. 2 , the controller 1 , the voltage transformer 3 , the protective current transformer 4 , and the high-voltage AC permanent magnet synchronous switch 5 are all placed in a box 8 . This device adopts an integrated hierarchical structure, and puts the protective current transformer 4, voltage transformer 3, high-voltage AC permanent magnet synchronous switch 5, etc. in a box 8, which not only reduces the influence of the external environment, but also improves the reliability, reduces the cost, and facilitates the installation, thereby making up for the deficiency of the existing reactive power compensation device. The box body 8 includes a wall bushing 9, and the wall bushing 9 is connected with 10KVA, B, and C three-phase. Wherein the casing 8 is a stainless steel or cold-rolled steel sheet casing.

The working process of this device is as follows: the 10KV power grid line enters the box body 8 through the wall bushing 9, and the voltage transformer 3 and the sampling current transformer 2 in the box body 8 sample the three-phase line and send the sampling signal to the controller 1 , and then calculate the reactive power and other electric energy parameters by the software algorithm of the controller 1, and the controller 1 outputs the control signal to the control circuit to control the switching of the compensation capacitor bank, so that the power factor of the three-phase power grid line can meet the requirements, and the installation point can be realized Dynamic compensation for voltage and reactive operating conditions. The MCU microprocessor control unit 101 analyzes and calculates the sampling signal sent by the sampling circuit and decides whether to output the control signal to the control circuit. The signal acquisition circuit of the controller 1 includes a voltage transformer, a current transformer, an optical coupler and the like. The circuit collects signals from the outside and sends them to the MCU microprocessor control unit 101 . The MCU microprocessor control unit 101 is completed by a digital signal processor (DSP) TMS320F2812. The GPRS network communication unit 102 can be used to realize wireless communication with the Internet.

The device can not only perform dynamic reactive power compensation, but also suppress grid harmonics, thereby avoiding or reducing the harm of harmonics to the grid, equipment and compensation capacitor itself. The protection function of the device is complete, and the operation is safe and reliable.

Claims (6)

1. A harmonic suppression type high-voltage dynamic reactive power automatic compensation device, comprising a controller (1), a sampling current transformer (2), a voltage transformer (3), and a protective current transformer (1) respectively connected to the controller (1). Transformer (4), high-voltage AC permanent magnet synchronous switch (5), described high-voltage AC permanent magnet synchronous switch (5) is also connected with filter reactor (10); described controller (1) includes MCU microprocessing Machine control unit (101) and GPRS network communication unit (102), described GPRS network communication unit (102) is provided with a communication interface (103), described MCU microprocessor control unit (101) and GPRS network communication unit (102 ) can realize dynamic compensation for installation point voltage and reactive power operating conditions, It is characterized in that: the high-voltage AC permanent magnet synchronous switch (5) is also connected to a filter reactor (10) for harmonic suppression, and the high-voltage AC permanent magnet synchronous switch (5) is located between the filter reactor (10) and The front end of the parallel capacitor (11), the filter reactor (10) is also connected with a parallel capacitor (11). 2. The harmonic suppression type high-voltage dynamic reactive power automatic compensation device according to claim 1, characterized in that: the fuse (6) is a drop-out fuse. 3. The harmonic suppression type high-voltage dynamic reactive power automatic compensation device according to claim 2, characterized in that: the arrester (7) is a zinc oxide arrester. 4. The harmonic suppression type high-voltage dynamic reactive power automatic compensation device according to claim 3, characterized in that: the controller (1), voltage transformer (3), protective current transformer (4), high-voltage AC The permanent magnet synchronous switch (5), the filter reactor (10), and the parallel capacitor (11) are all placed in a box (8). 5. The harmonic suppression type high-voltage dynamic reactive power automatic compensation device according to claim 4, characterized in that: the box (8) is a stainless steel or cold-rolled steel box. 6. The harmonic suppression type high-voltage dynamic reactive power automatic compensation device according to claim 5, characterized in that: the sampling current transformer (2) is an open current transformer.

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