CN215009575U

CN215009575U - Double-fed type wind generating set converter filter circuit device

Info

Publication number: CN215009575U
Application number: CN202120760982.XU
Authority: CN
Inventors: 刘海斌; 于满源; 王博
Original assignee: Huaneng Jiuquan Wind Power Co Ltd
Current assignee: Huaneng Jiuquan Wind Power Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-12-03
Anticipated expiration: 2031-04-14

Abstract

The utility model relates to the technical field of a filter circuit of a frequency converter of a wind generating set, in particular to a filter circuit device of a frequency converter of a double-fed wind generating set, which comprises a grid-connected switch, a fuse wire and a main filter, wherein the grid-connected switch is connected on a stator wiring copper bar, one end of the fuse wire is connected on the stator wiring copper bar, the other end of the fuse wire is connected on the main filter, a current transformer is connected between the fuse wire and the stator wiring copper bar, vent holes are arranged around a fuse wire base, and a fan is connected above the fuse wire base, the spare part loss is reduced, and the potential safety hazard is eliminated.

Description

Double-fed type wind generating set converter filter circuit device

Technical Field

The utility model relates to a wind generating set converter filter circuit technical field specifically is a double-fed type wind generating set converter filter circuit device.

Background

In the rotor circuit of a doubly-fed wind power plant, an inverter supplies the electrical machine with power matched to a particular speed voltage and frequency. The intermediate DC loop then inputs slip power from the main power supply or outputs slip power to the main power supply via another inverter. The main power supply filter isolates the voltage of the main power supply and the voltage of the switch equipment, and a reactor and a filter for reducing harmonic waves are adopted on the network side and the motor side. At the same time, the net-side filter limits the rise time and amplitude of the voltage and current as opposed to ground potential. The incoming line filter improves the overvoltage protection function.

However, the capacitance switching contactor and the frequency conversion in the filter loop of the frequency converter of the double-fed wind generating set in the prior art are damaged. The filtering loop is provided with a fuse, a capacitor switching contactor, a current limiting resistor, a capacitor and other devices, and the number of connecting points of cables in the loop is large. Under the current of normal operating, there will be certain power loss on cable, fuse and the electric capacity switching contactor, the fuse has bad contact's risk moreover. During normal operation, fusing isolator and lower extreme cable are located an inclosed environment, and the last produced heat of fusing isolator can't dissipate, burns out fuse, fusing isolator body and cable easily after the heat lasts the accumulation. After the contact of the capacitor switching contactor is oxidized and ablated for a long time, the contact resistance ratio is large, the heating quantity is increased when current flows, the heat generated by the contact can be transferred along with the contact metal, and the temperature of the connecting terminal of the contactor and the temperature of an upper cable are easily overhigh. The filter circuit of prior art has high frequency harmonic current in service for the contactor easily generates heat, flows in high frequency current in the cable for a long time, makes the ageing damage of cable crust, finally leads to filter contactor to burn out, and the companion insurance burns out.

The fuse, the capacitor switching contactor and the cable between the connecting fuse and the contactor in the double-fed wind generating set frequency converter filter circuit in the prior art are burnt to cause the following problems:

1. the failure shutdown of the unit is caused, the generating capacity of the unit is lost, and the availability of the unit is influenced;

2. the consumption and the loss of spare parts such as a fuse, a capacitance switching contactor, a cable and the like are caused;

3. when the cable and the capacitor switching contactor are burnt out, a short circuit between a network side loop and the ground in the frequency converter cabinet can be caused, and a power module and a network side main loop fuse can be damaged;

4. the cable and the capacitor switching contactor are burnt out, fire in the electrical cabinet can be caused, and major potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a double-fed type wind generating set converter filter circuit device reduces the filter circuit trouble, improves the unit availability, reduces the fault loss electric quantity.

For solving the technical problem, the utility model relates to a double-fed type wind generating set converter filter circuit device is including being incorporated into the power networks switch, fuse and main filter, and the switch connection that is incorporated into the power networks is on stator wiring copper bar, and fuse one end is connected on stator wiring copper bar, and the fuse other end is connected on main filter.

Furthermore, a current transformer is connected between the fuse wire and the stator wiring copper bar.

Furthermore, the electric cabinet is internally connected with a fuse wire base, the fuse wire is connected to the fuse wire base, the grid-connected switch is connected to the electric cabinet, and ventilation openings are formed in the periphery of the fuse wire base.

Furthermore, the electrical cabinet is internally connected with a fan, and the fan is connected above the fuse wire base.

Furthermore, a filter screen is connected to the fan.

Furthermore, the fan is electrically connected with a temperature control switch.

The utility model has the advantages that: including grid-connected switch, fuse and main filter, grid-connected switch connects on stator wiring copper bar, and fuse one end is connected on stator wiring copper bar, and the fuse other end is connected on main filter, is connected with current transformer between fuse and the stator wiring copper bar, and the fuse base is equipped with the vent all around, and the fan is connected in the fuse base top, the utility model discloses demolish former filter circuit electric capacity switching contactor, reduce the source that generates heat, avoid contactor contact resistance itself too big to lead to the problem of overheating burnout itself simultaneously, increased the fan and be favorable to the heat dissipation of fuse and grid-connected switch, the increase that has increased current transformer can real-time supervision filter circuit current, has solved the high trouble that causes of filter contactor temperature, has reduced the spare parts loss, has eliminated the potential safety hazard.

Drawings

FIG. 1 is an electrical schematic diagram of the present invention;

fig. 2 is an electrical schematic diagram of the filter circuit after the transformation of the utility model;

fig. 3 is a partial schematic view of the structure of the fuse base of the present invention.

In the figure: 1. an electrical cabinet; 2. a fuse base; 201. a vent; 4. a fan; 5. a temperature control switch; 6. a grid-connected switch; 7. a fuse; 8. a main filter; 9. a current transformer; 10. and (4) a filter screen.

Detailed Description

As shown in fig. 1-3, the utility model relates to a double-fed type wind generating set converter filter circuit device is including being incorporated into the power networks switch 6, fuse 7 and main filter 8, and switch 6 that is incorporated into the power networks is connected on stator wiring copper bar, and 7 one end connections of fuse are on stator wiring copper bar, and the 7 other ends of fuse are connected on main filter 8.

Furthermore, a current transformer 9 is connected between the fuse 7 and the stator wiring copper bar.

Further, including regulator cubicle 1, regulator cubicle 1 in-connection has fuse base 2, and fuse 7 is connected on fuse base 2, and grid-connected switch 6 is connected on regulator cubicle 1, and fuse base 2 is equipped with vent 201 all around.

Further, a fan 4 is connected inside the electrical cabinet 1, and the fan 4 is connected above the fuse base 2.

Furthermore, a filter screen 10 is connected to the fan 4.

Further, the fan 4 is electrically connected to a temperature control switch 5.

The utility model discloses only need change the part before the main filter 8, the rear end need not change, moves the filtering circuit from main contactor front end to the stator side, and the contactor rear end is incorporated into the power networks.

The switching contactor of the original filter circuit capacitor is removed, heating sources are reduced, and the problem that the contactor is overheated and burnt out due to overlarge contact impedance is avoided.

The fan 4 is added, so that heat dissipation of the fuse 7 and the grid-connected switch 6 is facilitated. Meanwhile, the ventilation opening is formed in the fuse wire base 2, air flowing is facilitated, the fan 4 is electrically connected with the temperature control switch 5, the fan 4 is automatically started and stopped according to temperature change through the temperature control switch, and the filter screen 10 is arranged to prevent the influence of sundries and insects in the air cooling process.

The current of the filtering loop can be monitored in real time by adding the current transformer, and a protection mechanism is optimized.

Will the utility model discloses use and accomplish 133 doubly-fed type wind generating set converter filter circuit's transformation at certain wind-powered electricity generation field, table 1 is for utilizing the utility model discloses monitoring data table around transforming, the trouble that the filter contactor temperature height caused has been solved to the transformation back.

Table 1: monitoring data tables before and after modification.

Claims

1. The utility model provides a double-fed type wind generating set converter filter circuit device which characterized in that: the novel transformer comprises a grid-connected switch (6), a fuse wire (7) and a main filter (8), wherein the grid-connected switch (6) is connected to a stator wiring copper bar, one end of the fuse wire (7) is connected to the stator wiring copper bar, and the other end of the fuse wire (7) is connected to the main filter (8).

2. The frequency converter filter loop device of the doubly-fed wind generating set according to claim 1, characterized in that: and a current transformer (9) is connected between the fuse wire (7) and the stator wiring copper bar.

3. The frequency converter filter loop device of the doubly-fed wind generating set according to any one of claims 1 or 2, wherein: the novel fuse wire box is characterized by comprising an electric cabinet (1), a fuse wire base (2) is connected in the electric cabinet (1), a fuse wire (7) is connected to the fuse wire base (2), a grid-connected switch (6) is connected to the electric cabinet (1), and ventilation openings (201) are formed in the periphery of the fuse wire base (2).

4. The frequency converter filter loop device of the doubly-fed wind generating set according to claim 3, characterized in that: the electric cabinet (1) is internally connected with a fan (4), and the fan (4) is connected above the fuse base (2).

5. The frequency converter filter loop device of the doubly-fed wind generating set according to claim 4, characterized in that: the fan (4) is connected with a filter screen (10).

6. The frequency converter filter loop device of the doubly-fed wind generating set according to claim 5, characterized in that: the fan (4) is electrically connected with a temperature control switch (5).