CN104124697A - Reactive automatic compensation system - Google Patents

Abstract

The application provides a reactive power automatic compensation system, including: a controller, an on-load voltage regulating transformer and a compensation device; wherein, the controller is used to obtain the voltage and current parameters of the high-voltage bus of the power grid, and calculate the electrical parameters of the high-voltage bus according to the voltage and current parameters ; The on-load tap changer is used to adjust the voltage and reactive power of the power grid according to the electrical parameters of the high-voltage bus; the compensation device is used to provide compensation to the power grid according to the adjusted voltage of the on-load tap changer. The reactive power automatic compensation system is used to calculate the voltage and current parameters of the high-voltage bus to obtain the electrical parameters of the high-voltage bus, and then adjust the main transformer tap changer according to the electrical parameters to adjust the voltage and reactive power in the grid. Compensate the power grid, save switching switch and capacitor grouping, avoid switching surge current, improve the service life of capacitors, reduce the loss of transmission lines and transformers as a whole, improve power supply efficiency, and improve power supply environment.

Description

A Reactive Power Automatic Compensation System

technical field

The invention belongs to the field of electric equipment, in particular to a reactive power automatic compensation system.

Background technique

With the continuous development of the national economy, the load of the power network has increased sharply, and the requirements for compensation of reactive power in the power grid have also increased day by day.

In the prior art, a fixed capacitor is generally used to implement reactive power compensation by switching a circuit breaker. However, frequent switching will cause damage to electrical equipment. During the switching process of a fixed capacitor bank, a switching surge current of more than ten times the rated current will be generated, which will cause unavoidable operating overload to the capacitor during switching. voltage, the service life of the capacitor is greatly reduced.

Contents of the invention

In view of this, the purpose of this application is to provide an automatic reactive power compensation system, which can avoid capacitor damage caused by frequent switching of circuit breakers and protect the safety of electric equipment.

A reactive power automatic compensation system, including: a controller, an on-load voltage regulating transformer and a compensation device;

Wherein, the controller is used to obtain the voltage and current parameters of the high-voltage bus of the power grid, and calculate the electrical parameters of the high-voltage bus according to the voltage and current parameters;

An on-load tap-changing transformer connected to the controller is used to adjust the voltage and reactive power of the grid according to the electrical parameters of the high-voltage bus;

The compensation device connected with the on-load voltage-regulating transformer is used for providing compensation to the power grid according to the regulated voltage of the on-load voltage-regulating transformer.

The above system, preferably, the system also includes a reversible motor and a main transformer tap changer, the reversible motor is connected to the on-load tap changer and the main transformer tap changer respectively, and the main transformer tap changer is connected to the power grid , the on-load tap changer is specifically used for:

Outputting a control signal to the reversible motor, the control signal is used to instruct the reversible motor to adjust the tap changer of the main transformer.

The above-mentioned system, preferably, also includes:

The oil filter device is used to filter the insulating oil used by the tap changer of the main transformer during voltage regulation and shifting.

In the above system, preferably, the compensation device includes: a capacitor and an inductor, and the compensation device is specifically used for:

The capacitor and the inductor are respectively connected to the on-load voltage-regulating transformer, receive the regulated voltage of the on-load voltage-regulating transformer, and provide compensation to the power grid according to the regulated voltage.

In the above system, preferably, when the electric power network equipment is provided with an electronically controlled safety door lock, the compensation device further includes: a primary coil, a secondary coil, and an equipment locking device;

Wherein, the primary coil supplies power to the capacitor;

The secondary coils are respectively connected to the secondary coils and the controller, and are used to output the capacitor discharge detection signal to the controller when detecting the capacitor discharge;

The device locking device is connected to the controller, and is used for receiving the safety signal sent by the controller when the controller judges that the discharge detection signal meets the preset no-power signal condition, and according to the safety signal Control the opening of the electric control safety door lock.

In the above-mentioned system, preferably, the compensation device further includes:

The fuses respectively connected to the capacitor and the inductor are used to fuse when the current value of the capacitor and/or the inductor is greater than a preset value.

The above-mentioned system, preferably, also includes:

The alarm device connected with the fuse is used for generating alarm information and prompting staff when the fuse is blown.

In the above-mentioned system, preferably, the alarm device includes:

A detection module, configured to detect the state information of the fuse;

A signal generating module, configured to generate alarm information when the state information meets the fusing condition;

The prompting module is used to prompt the staff according to the alarm information.

In the above-mentioned system, preferably, the way the prompting module prompts the staff includes: short message notification, screen display notification and/or prompt sound prompt.

In the above system, preferably, the controller is a voltage regulation and reactive power compensation controller ZVQC.

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a reactive power automatic compensation system, including: a controller, an on-load tap changer and a compensation device; wherein, the controller is used to obtain the grid high voltage The voltage and current parameters of the busbar, and calculate the electrical parameters of the high-voltage busbar according to the voltage and current parameters; the on-load tap changer is connected to the controller, and is used to adjust the voltage of the power grid according to the electrical parameters of the high-voltage busbar. Work power; the compensation device is connected with the on-load tap-changing transformer, and is used to provide compensation to the power grid according to the regulated voltage of the on-load tap-changing transformer. The reactive power automatic compensation system can calculate the voltage and current parameters of the high-voltage bus to obtain the electrical parameters of the high-voltage bus, and then adjust the main transformer tap changer according to the electrical parameters to adjust the voltage and reactive power in the grid , and compensate the grid. The switching switch and capacitor grouping are omitted, the switching surge current is avoided, and the service life of the capacitor is improved. On the whole, the loss of the transmission line and the transformer is reduced, the power supply efficiency is improved, and the power supply environment is improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic structural diagram of Embodiment 1 of a reactive power automatic compensation system provided by the present application;

Fig. 2 is a schematic structural diagram of Embodiment 2 of a reactive power automatic compensation system provided by the present application;

Fig. 3 is a schematic structural diagram of Embodiment 3 of a reactive power automatic compensation system provided by the present application;

Fig. 4 is a schematic structural diagram of Embodiment 4 of a reactive power automatic compensation system provided by the present application;

Fig. 5 is a structural schematic diagram of an alarm device in Embodiment 4 of an automatic reactive power compensation system provided by the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Figure 1 shows a schematic structural diagram of Embodiment 1 of an automatic reactive power compensation system provided by the present application, including: a controller 101, an on-load tap changer transformer 102 and a compensation device 103;

The thick solid line in the figure indicates the high-voltage bus of the grid, and the thick dashed line in the figure indicates the compensated grid line.

Wherein, the controller 101 is configured to obtain voltage and current parameters of the high-voltage bus of the power grid, and calculate electrical parameters of the high-voltage bus according to the voltage and current parameters;

Specifically, a transformer is installed at the high-voltage bus of the power grid, and the transformer samples the voltage and current parameters of the high-voltage bus, and the controller 101 obtains the voltage and current parameters of the high-voltage bus from the transformer, and then calculates the voltage and current parameters of the high-voltage bus electrical parameters.

Wherein, the voltage and current parameters include parameters such as voltage value and current value.

Wherein, the electrical parameters of the high-voltage bus include relevant electrical parameters such as active power, reactive power, and power factor.

On-load tap changer 102, used to adjust the voltage and reactive power of the power grid according to the electrical parameters of the high-voltage bus;

Wherein, the on-load voltage regulating transformer 102 is connected with the controller 101 .

Wherein, the on-load tap changer adjusts the voltage and reactive power of the grid according to the electrical parameters of the high-voltage bus, such as active power, reactive power and power factor.

For example, the power factor is an important technical data of the power system. Power factor is a coefficient to measure the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit for alternating magnetic field conversion is large, which increases the loss of line power supply.

Specifically, the reactive power of the grid is reduced, and the power factor is improved.

The compensation device 103 is connected with the on-load voltage-regulating transformer 102 and is used for providing compensation to the power grid according to the regulated voltage of the on-load voltage-regulating transformer 102 .

Wherein, the compensation device 103 is connected with the on-load voltage regulating transformer 102 .

Specifically, the compensation device 103 compensates the grid according to the regulated voltage adjusted by the on-load tap changer transformer to reduce the reactive power and improve the power factor.

In specific implementation, the controller can adopt ZVQC (voltage regulation and reactive power compensation controller).

To sum up, this embodiment provides an automatic reactive power compensation system, including: a controller, an on-load tap-changing transformer, and a compensation device; wherein, the controller is used to obtain the voltage and current parameters of the high-voltage bus of the power grid, and according to the The voltage and current parameters calculate the electrical parameters of the high-voltage bus; the on-load tap changer is connected to the controller, and is used to adjust the voltage and reactive power of the grid according to the electrical parameters of the high-voltage bus; the compensation device is connected to the on-load The voltage regulating transformer is connected to provide compensation to the power grid according to the regulated voltage of the on-load voltage regulating transformer. The reactive power automatic compensation system can calculate the voltage and current parameters of the high-voltage bus to obtain the electrical parameters of the high-voltage bus, and then adjust the main transformer tap changer according to the electrical parameters to adjust the voltage and reactive power in the grid , and compensate the grid, track the power factor of the grid in real time, and automatically compensate reactive power. The switching switch and capacitor grouping are omitted, the switching surge current is avoided, and the service life of the capacitor is improved. On the whole, the loss of the transmission line and the transformer is reduced, the power supply efficiency is improved, and the power supply environment is improved.

As shown in Figure 2, the structural diagram of Embodiment 2 of a reactive power automatic compensation system improved by the present application, the system includes: a controller 201, an on-load tap-changing transformer 202, a compensation device 203, a reversible motor 204 and a main transformer Connect switch 205.

The thick solid line in the figure indicates the high-voltage bus of the grid, and the thick dashed line in the figure indicates the compensated grid line.

Wherein, the functions of the controller 201 and the compensating device 203 are consistent with the corresponding structures in Embodiment 1, and will not be repeated in this embodiment.

Wherein, the reversible motor 204 is respectively connected with the on-load tap changer 202 and the main transformer tap changer 205, and the main transformer tap-changer 205 is connected with the power grid, then the on-load tap changer 202 is specifically used for: output control The signal is sent to the reversible motor 204 , and the control signal is used to instruct the reversible motor 204 to adjust the main transformer tap changer 205 .

Wherein, the main transformer tap changer 205 can adjust the voltage of the power grid by shifting gears and adjusting the on and off states.

It should be noted that the main transformer tap-changer 205 is the original structural equipment in the distribution station. The main transformer tap-changer can be used as a device in the power supply network or as a component in the reactive power automatic compensation system. The actual implementation It is enough to make certain adjustments to the connection relationship of the main transformer tap-changer in the process.

Wherein, the main transformer tap changer can also receive the control of the controller, so that the main transformer tap changer cooperates with the on-load tap changer to adjust the voltage and reactive power of the grid.

Among them, the main transformer extension switch can adopt an uninterrupted shift switch.

It should be noted that after receiving the control signal, the reversible motor realizes synchronous phase modulation, so that it can adjust the reactive power and voltage of the grid.

In a specific implementation, the reactive power automatic compensation system is also provided with an oil filter device, which is used to filter the insulating oil used by the main transformer tap changer during voltage regulation and shifting, so as to eliminate the free oil generated during voltage regulation and shifting. Carbon and metal particles are filtered to improve the electrical breakdown resistance of the insulating oil and the safety and stability of the switch, improve the safety performance of the equipment, and reduce the workload and labor intensity of the substation staff.

To sum up, this embodiment provides a reactive power automatic compensation system, which also includes: a reversible motor and a main transformer tap changer, and the on-load tap changer is specifically used for: outputting a control signal to the reversible motor, and the control The signal is used to instruct the reversible motor to adjust the main transformer tap changer, and the main transformer tap changer can adjust the voltage of the power grid by shifting gears and adjusting the on and off states.

FIG. 3 shows a schematic structural diagram of Embodiment 3 of a reactive power automatic compensation system improved by the present application. The system includes: a controller 301 , an on-load tap changer transformer 302 and a compensation device 303 .

The thick solid line in the figure indicates the high-voltage bus of the grid, and the thick dashed line in the figure indicates the compensated grid line.

Wherein, the functions of the controller 301 and the on-load tap-changing transformer 302 are consistent with the corresponding structures in Embodiment 1, and will not be repeated in this embodiment.

Wherein, the compensation device 303 includes: a capacitor 304 and an inductor 305, and the compensation device is specifically used for: the capacitor and the inductor receive the regulated voltage of the on-load tap-changing transformer, and provide power to the grid according to the regulated voltage compensate.

Among them, the formula for compensating reactive power:

Q＝U ² /Q _C

Among them, Q represents the reactive power, U represents the voltage across the capacitor, and Q _C represents the capacitive reactance.

According to this formula, the terminal voltage of the capacitor and/or reactor is changed through the on-load tap changer, thereby changing the reactive output capacity, which in turn increases the reactive power provided by the automatic compensation system.

Specifically, the on-load tap changer supplies power to the capacitor and the inductor, and the power supply adopts a voltage for regulating the power grid, and the capacitor and the inductor provide compensation to the power grid.

It should be noted that the capacitors and inductors are the original fixed compensation capacitors and related equipment of the power station. The original fixed compensation capacitors of the power station will not be processed, and voltage regulation will be added to realize the automatic compensation function.

In the specific implementation, the low-voltage switching of the capacitor is used to effectively reduce the impact of the switching surge of the capacitor on the system and the capacitor itself, and the capacitor works at a lower voltage, with a longer service life, reducing maintenance costs and workload. During the voltage regulation process, the capacitor is not separated from the grid, and there is no need for charging and discharging delays, which increases the tracking speed of reactive power compensation.

Further, in order to ensure the safety of the power network equipment, when the power network equipment is equipped with an electronically controlled safety door lock, the compensation device further includes: a primary coil, a secondary coil, and an equipment locking device;

Wherein, the primary coil is used to supply power to the capacitor; the secondary coil is respectively connected to the secondary coil and the controller, and is used to output the discharge voltage of the capacitor when detecting the discharge of the capacitor. The detection signal is sent to the controller; the device locking device is connected to the controller, and is used to receive the signal sent by the controller when the controller judges that the discharge detection signal meets the preset no-electric signal condition. The safety signal is used to control the opening of the electronically controlled safety door lock according to the safety signal.

During maintenance and overhaul, in order to ensure the safety of the staff, it is necessary to ensure that there is no electrical signal in the power network equipment, discharge the capacitor, and the secondary coil outputs the discharge detection signal obtained by detecting the capacitor to the controller, so that the controller can discharge the capacitor When the discharge detection signal meets the preset no-power signal condition, the controller sends a safety signal to the device locking device, and the device locking device controls the electronically controlled safety door lock after receiving the safety signal Open to allow personnel access for maintenance and inspection.

To sum up, the compensation device of a reactive power automatic compensation system provided in this embodiment includes: a capacitor and an inductor, and the compensation device is specifically used for: the capacitor and the inductor receive the regulated voltage of the on-load tap-changing transformer , and provide compensation to the grid according to the regulated voltage. The capacitors and inductors are the original fixed compensation capacitors and related equipment of the power station. The original fixed compensation capacitors of the power station are not treated, and the voltage adjustment is added to realize the automatic compensation function. The changes to the existing equipment are small and easy to implement. .

FIG. 4 shows a schematic structural diagram of Embodiment 4 of a reactive power automatic compensation system improved by the present application. The system includes: a controller 401 , an on-load tap-changing transformer 402 , a compensation device 403 and an alarm device 404 .

The thick solid line in the figure indicates the high-voltage bus of the grid, and the thick dashed line in the figure indicates the compensated grid line.

Wherein, the functions of the controller 401 and the on-load tap-changing transformer 402 are consistent with the corresponding structures in Embodiment 3, and will not be repeated in this embodiment.

Wherein, the compensation device 403 includes: a capacitor 405, an inductor 406 and a fuse 407;

Wherein, the fuse 407 is connected with the capacitor 405 and the inductor 406 respectively, and is used for fusing when the current value of the capacitor and/or inductor is greater than a preset value, so as to protect the capacitor and inductor from being affected by the instantaneous peak current Shock, to protect the operation safety of capacitors and inductors.

Of course, in actual implementation, corresponding fuses may be provided for capacitors and inductors respectively, and the fuses only protect the devices connected to them.

In specific implementation, in order to ensure the safety of the equipment, the compensation device can also be provided with a lightning rod to prevent the equipment from being struck by lightning.

Wherein, the alarm device 404 is connected with the fuse 407, and is used for generating alarm information and prompting staff when the fuse is blown.

Among them, the alarm device checks the fuse. When the fuse is blown, it indicates that the current of the capacitor or inductor is too large, and an alarm message is generated to prompt the staff to pay attention. The reactive power automatic compensation system or the grid system is adjusted to ensure the safety of the grid operation.

As shown in FIG. 5 , a schematic structural diagram of an alarm device in Embodiment 4 of an automatic reactive power compensation system improved by the present application, including: a detection module 501, a signal generation module 502 and a prompt module 503;

A detection module 501, configured to detect the state information of the fuse;

Among them, the detection module 501 detects the status information of the fuse in real time and transmits it to the signal generation module 502.

Wherein, the state information includes: on or off.

Specifically, the detection state information can be obtained by detecting the current of the fuse. When the current value is 0, the state information is blown, otherwise it is on; or by detecting the voltage of the fuse, when the voltage value is infinite , the status information is blown, otherwise it is turned on.

A signal generating module 502, configured to generate alarm information when the state information meets the fusing condition;

Wherein, the signal generating module is used for judging the state, and generating alarm information when the state information satisfies the fusing condition.

Specifically, the alarm information may carry identification information such as the location or label of the blown fuse.

Prompt module 503, configured to prompt staff according to the alarm information.

Specifically, the way the prompt module prompts the staff may include: short message notification, screen display notification and/or prompt sound prompt.

After receiving the alarm information, the staff can adjust the reactive power automatic compensation system or the power grid system of the application according to the actual situation, so as to ensure the safety of the power grid operation.

To sum up, the compensation device of a reactive power automatic compensation system provided by this embodiment includes: a controller, an on-load tap-changing transformer, a compensation device and an alarm device, and the compensation device includes: a capacitor, an inductor and a fuse; wherein, The fuse is connected to the capacitor and the inductor respectively, and is used to fuse when the current value of the capacitor and/or the inductor is greater than a preset value, to protect the capacitor and the inductor from the impact of the instantaneous peak current, and to protect the capacitor and the inductor. Inductors operate safely. The alarm device is used to generate alarm information when the fuse is blown, and remind the staff to pay attention. After receiving the alarm information, the staff can adjust the reactive power automatic compensation system or power grid system of the application according to the actual situation processing to ensure the safety of power grid operation.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device provided in the embodiment, since it corresponds to the method provided in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the embodiments provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features presented herein.

Claims (10)

1. an imaginary power automatic compensation system, is characterized in that, comprising: controller, on-load tap-changing transformer and compensation arrangement;

Wherein, described controller, for obtaining the voltage and current parameter of electrical network high voltage bus, and the described voltage and current parameter of foundation calculates the electric parameter of described high voltage bus;

The on-load tap-changing transformer being connected with described controller, for voltage and the reactive power of the electric parameter adjusting electrical network according to described high voltage bus;

The compensation arrangement being connected with described on-load tap-changing transformer, affords redress to electrical network for the regulation voltage according to on-load tap-changing transformer.

2. system according to claim 1, it is characterized in that, described system also comprises reversible electric machine, main transformer shunting switch, described reversible electric machine is connected with main transformer shunting switch with on-load tap-changing transformer respectively, described main transformer shunting switch is connected with electrical network, described on-load tap-changing transformer specifically for:

Output control signals to described reversible electric machine, described control signal is used to indicate described reversible electric machine and regulates described main transformer shunting switch.

3. system according to claim 2, is characterized in that, also comprises:

The oil-filtering apparatus being connected with main transformer shunting switch, filters for the insulating oil that described main transformer shunting switch is used in the time that pressure regulation is shifted gears.

4. system according to claim 1, is characterized in that, compensation arrangement comprises: capacitor and inductor, described compensation arrangement specifically for:

Described capacitor is connected with described on-load tap-changing transformer respectively with inductor, receives the regulation voltage of described on-load tap-changing transformer, and according to described regulation voltage, electrical network is afforded redress.

5. system according to claim 4, is characterized in that, in the time being provided with controlled safety door lock in electric power networks equipment, described compensation arrangement also comprises: primary coil, secondary coil and device latchup device;

Wherein, described primary coil is described capacitor power supply;

Described secondary coil is connected with described controller with described secondary coil respectively, in the time that described capacitor discharge is detected, exports described capacitor discharge detection signal to described controller;

Described device latchup device is connected with described controller, for when described controller judge described discharge examination signal meet preset without the signal of telecommunication condition time, receive the safety signal that described controller sends, and open according to this safety signal control controlled safety door lock.

6. system according to claim 4, is characterized in that, described compensation arrangement also comprises:

The fuse being connected with inductor with described capacitor respectively, for fusing in the time that the current value of described capacitor and/or inductor is greater than preset value.

7. system according to claim 6, is characterized in that, also comprises:

The warning device being connected with described fuse, for when the described fuse blows, generates warning message, and points out staff.

8. system according to claim 7, is characterized in that, described warning device comprises:

Detection module, for detection of the state information of described fuse;

Signal generation module, in the time that described state information meets fusing condition, generates warning message;

Reminding module, for the described alarm message reminding staff of foundation.

9. system according to claim 8, is characterized in that, reminding module prompting staff's mode comprises: short message notification, screen display notice and/or prompt tone prompting.

10. system according to claim 1, is characterized in that, described controller is voltage-regulation and idle compensating control ZVQC.