CN105179282A - SVG fan energy consumption reduction method - Google Patents

Abstract

The invention discloses an energy consumption reduction method for an SVG fan, which sets the fan to run at a rated rotating speed and comprises the following steps: A. detecting a temperature value of a module in the SVG; B. comparing the detected temperature value and the set temperature value in the step A; C. if the detected temperature value is less than the set temperature value, switching into a hot standby scheme to close all fans or adopting a frequency converter sectional speed reduction scheme; D. and if the detected temperature value is greater than or equal to the set temperature value, maintaining the running state of the fan. Under the condition that the equipment is not required to be greatly modified, the fan is stopped when the SVG body normally operates in a hot standby scheme, so that the energy consumption of the fan is saved; and adopting a scheme of controlling the fan by the frequency converter, determining the air output of the fan required by the power unit at different temperatures, and controlling the rotating speed of the fan to reach the set air output by the frequency converter to save the power consumption of the equipment, wherein the consumption of the equipment body can be saved by more than 50% through calculation.

Description

A method for reducing energy consumption of SVG fans

technical field

The invention relates to a static var generator SVG, in particular to a method for reducing energy consumption of an SVG fan.

Background technique

Static Var Generator SVG (StaticVarGenerator, also known as Statcom: StaticSynchronousCompensator), is the representative of the latest technology in the field of reactive power compensation. The SVG is connected in parallel in the power grid, which is equivalent to a variable reactive current source. Its reactive current can be flexibly controlled, and it can automatically and continuously adjust the reactive power compensation amount according to the change of the load to maintain the bus voltage, or realize the compensation through current tracking. Real-time dynamic compensation of impact load or harmonic load. Due to its fast response speed, SVG is of great significance to solve power quality problems such as three-phase unbalance, voltage fluctuation, excessive harmonics, and low power factor caused by impact loads.

At present, SVG is gradually replacing the role of capacitor bank and SVC in reactive power compensation of the grid, but because SVG is composed of high-power power devices (IGBT), it will switch frequently during operation, which requires fans to dissipate heat from the power unit. But most of the time, the SVG is not running at full capacity, so the air output of the fan not running at the rated speed can meet the heat dissipation of the power unit.

Contents of the invention

In order to solve the above technical problems, the object of the present invention is to provide a method for reducing energy consumption of an SVG fan.

The technical scheme adopted in the present invention is:

A method for reducing energy consumption of an SVG fan, setting the fan to run at a rated speed, comprising the following steps:

A. Detect the temperature value of the module in SVG;

B, comparing the size of the detected temperature value and the set temperature value in step A;

C. If the detected temperature value is lower than the set temperature value, put into the hot standby scheme to turn off all fans or adopt the inverter step-down speed reduction scheme;

D. If the detected temperature value is greater than or equal to the set temperature value, keep the fan running.

The thermal standby scheme in step C includes the following: C1, no minor faults, all fans are stopped; C2, minor faults, all fans are turned on.

The step C1 includes: C11, triggering a minor fault of the unit, judging whether there is a feedback fan closing signal, if so, the fan is sequentially started to continue hot standby operation, otherwise a major fault is triggered, and the device trips; C12, withdrawing from the hot standby state, judging Judging whether there is a feedback fan closing signal, if there is, the fan will start the equipment in sequence to enter the running state, otherwise it will trigger a serious fault and the equipment will trip.

The step C2 includes: C21, reset to minor faults, judge whether there is a feedback fan closing signal, if so, stop the fans and continue the hot standby operation, otherwise trigger a major fault, and the equipment will trip; C22, withdraw from the hot standby state, judge and judge Whether there is a feedback fan closing signal, if there is, the fan will continue to run and the device will enter the running state, otherwise a major fault will be triggered and the device will trip.

In the step C, the segmented deceleration scheme of the frequency converter is to divide it into multiple temperature points from the highest temperature to the lowest temperature according to the order of height, and set the speed of each temperature point from large to small according to the order of height, wherein the highest temperature point The fan runs at the rated speed above the rated speed, and the fan stops below the lowest temperature point.

Beneficial effects of the present invention:

The present invention does not need to make major modifications to the equipment, respectively uses the hot standby scheme to stop the fan when the SVG body is running normally, and saves the energy consumption of the fan; and uses the inverter to control the fan scheme to determine the different temperatures of the power unit The air volume of the fan required at the time, the fan speed is controlled by the frequency converter to reach the set air volume, so as to save the power consumption of the equipment. After calculation, more than 50% of the consumption of the equipment body can be saved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in the description of the embodiments. Apparently, the drawings described are only part of the embodiments of the present invention, not all embodiments. Those skilled in the art can obtain other design solutions and drawings under the premise of the description of the drawings:

Fig. 1 is a flow chart of the present invention;

Fig. 2 is the flowchart of hot backup scheme of the present invention;

Fig. 3 is a flow chart of the segmental deceleration scheme of the frequency converter of the present invention.

Detailed ways

Referring to Figure 1, it is a method for reducing energy consumption of a SVG fan of the present invention, setting the fan to run at a rated speed, including the following steps:

A. Detect the temperature value of the module in SVG;

B, comparing the size of the detected temperature value and the set temperature value in step A;

C. If the detected temperature value is lower than the set temperature value, put into the hot standby scheme to turn off all fans or adopt the inverter step-down speed reduction scheme;

D. If the detected temperature value is greater than or equal to the set temperature value, keep the fan running.

When the SVG generates a large current, the fan runs normally; after the fan hot standby function is put into use, the temperature of all modules is detected, and if it is lower than the set value, the fan is stopped, and the fan is started when the temperature reaches the set value (the set value is modified on site. ), so as to achieve the purpose of reducing SVG power consumption.

As shown in FIG. 2 , the hot standby solution in step C includes the following: C1, no minor fault, all fans are stopped; C2, minor fault, all fans are turned on.

Step C1 includes: C11, triggering a minor fault of the unit, judging whether there is a feedback fan closing signal, if so, the fan will start sequentially and continue the hot standby operation, otherwise a major fault will be triggered, and the device will trip; C12, withdraw from the hot standby state, and judge whether it is There is a feedback fan ON signal, if there is, the fan will start the equipment in order to enter the running state, otherwise it will trigger a serious fault and the equipment will trip.

Step C2 includes: C21, return to minor faults, judge whether there is a feedback fan closing signal, if so, stop the fans and continue hot standby operation, otherwise trigger a major fault, and the device will trip; C22, withdraw from the hot standby state, and judge whether there is Feedback the fan ON signal, if there is, the fan will continue to run and the device will enter the running state, otherwise a major fault will be triggered and the device will trip.

As shown in Figure 3, the fan in SVG is mainly used to dissipate heat from the module. The temperature of the module changes with the output power of the SVG. Therefore, the speed of the fan is controlled according to the change of the module temperature, and the air volume is adjusted so that The air output of the fan can meet the heat dissipation requirements of the module and reduce the power consumption of the fan.

Use FPGA to collect the temperature of all modules and determine the air output of the fan according to the temperature of the module. All fans are 4-level fans with a rated speed of 1500r/min. Variable frequency is used to control the fan speed to control the air output of the fan and realize multi-stage speed control. Thereby reducing power consumption. The specific scheme is shown in Table 1:

Table 1

As mentioned above, the present invention uses the hot standby scheme to stop the fan when the SVG body is running normally, saving the energy consumption of the fan, and adopts the inverter to control the fan to determine The air output of the fan required by the power unit at different temperatures is controlled by the frequency converter to achieve the set air output, so as to save the power consumption of the equipment. After calculation, more than 50% of the consumption of the equipment body can be saved.

The above descriptions are only preferred implementations of the present invention, and the present invention is not limited to the above-mentioned implementations, as long as the technical solutions that achieve the purpose of the present invention by basically the same means fall within the protection scope of the present invention.

Claims (5)

1. an energy consuming process falls in SVG blower fan, and setting blower fan runs with rated speed, it is characterized in that: comprise the following steps,

The temperature value of module in A, detection SVG;

The size of detected temperatures value and set temperature value in B, comparison step A;

If C detected temperatures value is less than set temperature value, drops into stand-by heat scheme and close all blower fans or adopt frequency variator section decelerating scheme;

If D detected temperatures value is more than or equal to set temperature value, then maintain fan operation state.

2. energy consuming process falls in a kind of SVG blower fan according to claim 1, it is characterized in that: in described step C, stand-by heat scheme comprises following: C1, without light fault, blower fan full cut-off; C2, have light fault, blower fan opens entirely.

3. energy consuming process falls in a kind of SVG blower fan according to claim 2, it is characterized in that: described step C1 comprises: C11, trigger element light fault, judged whether that feedback blower fan closes signal, if having, blower fan sequence starting continues spinning operation, otherwise trigger heavy fault, equipment chaser; C12, withdraw from hot stand-by duty, judged whether that feedback blower fan closes signal, if having, blower fan sequence starting equipment enters running state, otherwise triggers heavy fault, equipment chaser.

4. energy consuming process falls in a kind of SVG blower fan according to claim 2, it is characterized in that: described step C2 comprises: C21, involution light fault, judged whether that feedback blower fan closes signal, if having, blower fan full cut-off continues spinning operation, otherwise trigger heavy fault, equipment chaser; C22, withdraw from hot stand-by duty, judged whether that feedback blower fan closes signal, if having, blower fan continues operational outfit and enters running state, otherwise triggers heavy fault, equipment chaser.

5. energy consuming process falls in a kind of SVG blower fan according to claim 1, it is characterized in that: in described step C, frequency variator section decelerating scheme is, multiple temperature spots is divided into from maximum temperature to minimum temperature by sequence, each temperature spots presses sequence setting rotating speed from big to small, wherein, maximum temperature point runs with fan rated speed, the following blower fan full cut-off of minimum temperature point.