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Electric network reactive compensator and method thereof

A compensation device and compensation method technology, applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problems of compensation capacitor and other equipment damage, limiting compensation effect, switching oscillation, etc., to avoid overvoltage High hazard, significant economic benefits, and the effect of saving equipment investment

Inactive Publication Date: 2006-09-20
王南宁 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Since the measurement point and the compensation point of the reactive power automatic compensation device are the same point, usually 2 / 3 of the line length from the power transmission end, and this point cannot reflect the overall load situation of the power grid line, so it cannot be analyzed correctly The reactive power demand cannot correctly provide the conditions for switching compensation capacitors, which limits the further improvement of the compensation effect
[0004] 2. Since the controller cannot measure the reactive power and changes in the front-end line of the measurement point, this will inevitably cause part of the reactive power to be sent back to the power supply end, which will not only increase the line loss, but also cause the voltage to be too high, resulting in compensation capacitors and Other equipment breaks down quickly
[0005] 3. When the reactive power of the load at the back end of the measurement point is less than the capacity of the compensation capacitor, the reactive power flow will flow to the power supply end. At this time, the controller will consider it as "overcompensation" and cut off the compensation capacitor; after cutting off, the reactive power flow will change , and need to input compensation capacitor, so it is easy to produce switching oscillation

Method used

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  • Electric network reactive compensator and method thereof
  • Electric network reactive compensator and method thereof

Examples

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Effect test

Embodiment 1

[0011] Embodiment 1: see attached figure 1 , a power grid reactive power compensation device, including a measurement control unit 1, one or more switching and reactive power compensation units 2, the measurement control unit 1, the switching and reactive power compensation unit 2 all have a The wireless data transmission unit 13, 21, the measurement control unit 1 calculates the reactive power or voltage based on the measured grid line voltage and current value as a control basis, and sends a control command through the wireless data transmission unit 13, and the switching And the reactive power compensation unit 2 accepts the control instruction through the wireless data transmission unit 21 and executes it.

Embodiment 2

[0012] Embodiment 2: see attached figure 1 , in the grid reactive power compensation device described in Embodiment 1,

[0013] The wireless data transmission units 13 and 21 transmit data using time-division frequency hopping technology;

[0014] The controller 12 of the measurement control unit 1 is a DSP240 single-chip microcomputer, and the program memory adopts 2764 chips; the input signal adopts AC sampling 11, the three-phase voltage is transformed by PT, and the three-phase current is transformed by CT, and becomes a voltage signal on the standard resistance , and then sent to the multi-channel switch through RC smoothing filter, and sent to the A / D port of the DSP240 single-chip microcomputer through gain amplification; the sampling frequency is 128 points per cycle, and the I / O output control command of the DSP240 single-chip microcomputer;

[0015] The compensation capacitor banks 22 of the switching and reactive power compensation unit 2 are grouped in a ratio of ...

Embodiment 3

[0016] Embodiment 3: see attached figure 1 , in the grid reactive power compensation device described in Embodiment 1 or 2, the measurement control unit 1 further includes:

[0017] A parameter setting module 14, to automatically set and manually set different control parameters such as reactive power, voltage, power factor, and time with dynamic tracking;

[0018] A statistical module 15, to count the total commissioning time, capacitor bank commissioning time, capacitor bank commissioning times or commissioning rate, etc.;

[0019] A display module 16 to display operating parameters, working status, protection status, etc.;

[0020] A communication module 17 to realize remote operation data transcription and monitoring.

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Abstract

The reactive compensation equipment for power network includes a unit of control of measurement, one or more casting and switching reactive compensation units. Each unit includes a wireless digital transmission. Unit of control of measurement is setup at first end of distributed line. Casting and switching reactive compensation units are setup at one or multiple load centers of power supply in distributed line. The invention separates off the unit of control of measurement from casting and switching reactive compensation unit in long distance; and decides strategy of compensation based on state of load on global power network so as to obtain optimal effect of compensation. The invention also prevents harm from happening of casting and switching oscillation, and too high voltage. Only one set of unit of control of measurement is needed to support reactive compensation units installed at multiple nodes of load so as to save investment on equipment.

Description

technical field [0001] The invention belongs to electric equipment and its use method, in particular to a device and method for compensating reactive power of a grid. Background technique [0002] The working process of the reactive power automatic compensation device currently applied on the distribution line is: the controller continuously collects the voltage and current of a certain point of the power grid line through the voltage / current transformer (PT / CT), calculates and analyzes the reactive power or power The size of the factor and the voltage level, when each parameter meets the set value of the input, the controller sends an instruction to drive the switching switch to close, so that the compensation capacitor is put into operation; The device issues an instruction to drive the switching switch to open, so that the compensation capacitor is out of operation. Its disadvantages are: [0003] 1. Since the measurement point and the compensation point of the reactive...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 王南宁杨建超
Owner 王南宁
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