CN208423799U - A kind of grid nodes stable-pressure device - Google Patents
A kind of grid nodes stable-pressure device Download PDFInfo
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- CN208423799U CN208423799U CN201820504982.1U CN201820504982U CN208423799U CN 208423799 U CN208423799 U CN 208423799U CN 201820504982 U CN201820504982 U CN 201820504982U CN 208423799 U CN208423799 U CN 208423799U
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Abstract
The utility model discloses a kind of grid nodes stable-pressure devices, including grid nodes stable-pressure device input terminal, grid nodes stable-pressure device output end, input voltage sample circuit unit, compensator transformer assembled unit, output current sampling circuit unit, output control circuit unit, SCR drive circuit unit, output voltage sampling circuit unit, main control MCU circuit unit and key and display circuit unit；By the implementation of the present apparatus, can solve simultaneously distributed generation resource access and the effect of network load to the power distribution network bring more upper limit and more Lower Boundary, improve the quality of voltage of power distribution network；The real-time monitoring that can also realize distribution network voltage level adjusts algorithm according to power grid control policy development accordingly, improves the automatization level of distribution network；Apparatus structure is simple and practical, easy for installation, is not required to that network voltage problem can be solved to the progress mass upgrade transformation of existing rack, reduces investment outlay.
Description
Technical field
The present invention relates to a kind of stable-pressure device, in particular to a kind of grid nodes stable-pressure device.
Background technique
As energy crisis is increasingly sharpened, the demand of conventional petroleum fossil energy is replaced increasingly to compel using renewable energy
It cuts.Since the application of wind-powered electricity generation, photovoltaic energy has popularity, free of contamination remarkable advantage, national policy is also being propped up energetically
It holds, therefore, distributed photovoltaic, the wind-powered electricity generation energy obtain explosive increase in recent years.However, distributed photovoltaic, the wind-powered electricity generation energy
Have the shortcomings that obvious, since the input of its electric energy is highly dependent on natural environmental condition, input inevitably has
Randomness, fluctuation and uncertainty cause the output power of electric energy to there is intermittent and fluctuation, especially in grid entry point
Voltage fluctuation is more obvious.Putting into operation and cutting off for power grid user electrical equipment, can also aggravate the variation of network voltage.When wind-powered electricity generation,
When photovoltaic energy accesses power distribution network, since the regulating and controlling voltage means of conventional electrical distribution net are less, when wind-powered electricity generation, photovoltaic energy output power
When variation, distribution network voltage is likely to occur big ups and downs.When wind-powered electricity generation, photovoltaic energy output are larger, distribution network voltage, which exists, to be got over
The risk of the upper limit, and after its output power is reduced, with the increase of power grid power load, distribution network voltage, which exists, gets over lower limit wind
Danger.Therefore, wind-powered electricity generation, photovoltaic energy distributed plant-grid connection power network line in, power grid is kept by certain device
Voltage stabilization is extremely important and eager.
Summary of the invention
The purpose of the present invention is provide a kind of grid nodes stable-pressure device to solve above-mentioned prior art problem.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of grid nodes stable-pressure device, including the output of grid nodes stable-pressure device input terminal, grid nodes stable-pressure device
End, input voltage sample circuit unit M1, compensator transformer assembled unit M2, output current sampling circuit unit M3, output control
Circuit unit M4, SCR drive circuit unit M5 processed, output voltage sampling circuit unit M6, main control MCU circuit unit M7, key
With display circuit unit M8；The main control MCU circuit unit M7 include but is not limited to MCU, power circuit, filter circuit, input/
Output circuit forms MCU work system；The compensator transformer assembled unit M2 is made of 3 single-phase voltage compensating units, institute
It states single-phase voltage compensating unit to be made of more voltage compensation transformers and corresponding voltage polarity transformation circuits, voltage compensation transformation
Device secondary windings is sequentially connected in series between the outputting and inputting of compensated line, and voltage compensation primary winding passes through voltage pole
Property translation circuit to voltage compensation transformer secondary output power, polarity switching circuit use high reliability thyristor circuit, it is described
Thyristor is controlled by main control MCU circuit unit M7, realizes voltage polarity reversal；The grid nodes stable-pressure device input terminal
It is connect with input voltage sample circuit unit M1, compensator transformer assembled unit M2；The compensator transformer assembled unit M2 is also
It is connect with output current sampling circuit unit M3, SCR drive circuit unit M5, output voltage sampling circuit unit M6；It is described defeated
Current sampling circuit unit M3 is also connect with output control circuit unit M4 out；The output of the output control circuit unit M4 connects
Get access to grid node stable-pressure device output end；The main control MCU circuit unit M7 respectively with input voltage sample circuit unit M1, defeated
Current sampling circuit unit M3, output control circuit unit M4, SCR drive circuit unit M5, output voltage sampling circuit list out
First M6 and key are connect with display circuit unit M8；The grid nodes stable-pressure device input terminal connection power grid main transformer low pressure output
Side；The stable-pressure device output end connects junior's power grid, and junior's power grid is connected to electrical equipment or distributed generation resource.
Preferentially, the compensator transformer of the single-phase compensating unit is 3, is sequentially connected in series the input terminal in phase line, institute
2% that compensator transformer T1 offset voltage is voltage rating is stated, the compensator transformer T2 offset voltage is voltage rating
6%, compensator transformer T3 offset voltage is the 18% of voltage rating, and the precision of voltage regulation after 3 compensator transformers combination is
2%, voltage stabilized range is ± 26%.
Preferentially, the polarity switching for becoming compensator transformer uses thyristor Super-zero control.
Preferentially, the polarity selects thyristor for bidirectional thyristor.
Preferentially, the thyristor is SCR or BCR.
Preferentially, the control of polarity transformation circuits is executed by MCU by driving circuit, and MCU is according to network voltage, output electricity
Stream and output voltage determine that the conducting of every phase thyristor polarity transformation circuits S1~S12 is combined with cut-off, realization output voltage
Closed-loop control.
Preferentially, the output control circuit unit cuts off output in output overvoltage or/and overcurrent, provide over-voltage or/
And overcurrent protection.
Preferentially, the voltage compensation transformer offset voltage is selected by 3 times of incremental manners.
Preferentially, there are communication interfaces by the main control MCU circuit unit M7.
The invention has the advantages that using distributed generation resource access and network load can be solved after the utility model simultaneously
Effect to the power distribution network bring more upper limit and more Lower Boundary, improve the quality of voltage of power distribution network；In addition, convenient and power grid master
The monitoring device of monitoring room communicates, and the real-time monitoring of distribution network voltage level may be implemented completely, according to power grid control strategy system
Fixed corresponding adjusting algorithm, improves the automatization level of distribution network；Apparatus structure provided by the embodiment of the utility model is simple
It is practical, it is easy for installation, it is not required to that network voltage problem can be solved to the progress mass upgrade transformation of existing rack, reduces investment outlay.
Detailed description of the invention
Fig. 1 is grid nodes regulator structure chart；
Fig. 2 is single-phase voltage compensating unit main circuit diagram.
Wherein, M1. input voltage sample circuit unit, M2. compensator transformer assembled unit, M3. export current sample electricity
Road unit, M4. output control circuit unit, M5.SCR drive circuit unit, M6. output voltage sampling circuit unit, M7. master control
MCU circuit unit, M8. key and display circuit unit.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, a kind of grid nodes stable-pressure device, including grid nodes stable-pressure device input terminal, grid nodes are steady
Pressure device output end, input voltage sample circuit unit M1, compensator transformer assembled unit M2, output current sampling circuit unit
M3, output control circuit unit M4, SCR drive circuit unit M5, output voltage sampling circuit unit M6, main control MCU circuit list
First M7, key and display circuit unit M8；The main control MCU circuit unit M7 includes but is not limited to MCU, power circuit, filtering
Circuit, input/output circuitry form MCU work system；The compensator transformer assembled unit M2 is compensated by 3 single-phase voltages
Unit composition, the single-phase voltage compensating unit are made of more voltage compensation transformers and corresponding voltage polarity transformation circuits,
Voltage compensation transformer secondary output winding is sequentially connected in series between the outputting and inputting of compensated line, voltage compensation primary around
Group is powered by inverter of voltage polarity to voltage compensation transformer secondary output, and polarity switching circuit uses the brilliant lock of high reliability
Pipe circuit, the thyristor are controlled by main control MCU circuit unit M7, realize voltage polarity reversal；The grid nodes are steady
Pressure device input terminal is connect with input voltage sample circuit unit M1, compensator transformer assembled unit M2；The compensator transformer
Assembled unit M2 also with output current sampling circuit unit M3, SCR drive circuit unit M5, output voltage sampling circuit unit M6
Connection；The output current sampling circuit unit M3 is also connect with output control circuit unit M4；The output control circuit list
The output of first M4 connects grid nodes stable-pressure device output end；The main control MCU circuit unit M7 is sampled with input voltage respectively
Circuit unit M1, output current sampling circuit unit M3, output control circuit unit M4, SCR drive circuit unit M5, output electricity
Pressure sample circuit unit M6 and key are connect with display circuit unit M8；The grid nodes stable-pressure device input terminal connects power grid
Main transformer low pressure outlet side；The stable-pressure device output end connects junior's power grid, and junior's power grid is connected to electrical equipment or distributed electrical
Source.Output control circuit unit M4 controls power output according to the sampled result of main control MCU in the process of running, further,
Overvoltage, overcurrent protection can also be carried out, is not able to satisfy the occasion automatic switching equipment of junior's grid equipment needs in output；
Key and display circuit unit M8 can show the operation conditions and parameter signal of equipment on the spot, facilitate worker's local operation.
In embodiment, the compensator transformer of single-phase compensating unit is multiple, and specific data are according to requiring the pressure stabilizing reached
Precision and voltage stabilized range are selected.It is illustrated so that the compensator transformer of single-phase compensating unit is 3 as an example below, it is single-phase
Compensator transformer T1~T3 of compensating unit is sequentially connected in series the input terminal in phase line；Compensator transformer T1 offset voltage is specified
The 2% of voltage, compensator transformer T2 offset voltage are the 6% of voltage rating, and compensator transformer T3 offset voltage is voltage rating
18%；Total precision of voltage regulation after 3 compensator transformer combinations is 2%, and voltage stabilized range is ± 26%.Thyristor S1~S12 is
The polarity of three compensator transformers, when thyristor S1 and thyristor S8 is connected, thyristor S7 and thyristor S2 cut-off, compensation become
The connection of depressor T1 forward direction, offset voltage are+2%；When thyristor S2 and thyristor S7 is connected, thyristor S1 and thyristor S8 are cut
Only, compensator transformer T1 Opposite direction connection, offset voltage are -2%；When thyristor S1 and thyristor S2 are connected, thyristor S7 and
When thyristor S8 cut-off or thyristor S7 and thyristor S8 are connected, thyristor S1 and thyristor S2 cut-off, compensator transformer T1
Primary is shorted, offset voltage 0；When thyristor S3 and thyristor S10 is connected, thyristor S9 and thyristor S4 cut-off, compensation
The connection of transformer T2 forward direction, offset voltage are+6%；When thyristor S4 and thyristor S9 is connected, thyristor S3 and thyristor
S10 cut-off, compensator transformer T2 Opposite direction connection, offset voltage are -6%；When thyristor S3 and thyristor S4 is connected, thyristor
When S9 and thyristor S10 cut-off or thyristor S9 and thyristor S10 are connected, thyristor S3 and thyristor S4 cut-off, compensation become
Depressor T2 primary is shorted, offset voltage 0；When thyristor S5 and thyristor S12 is connected, thyristor S11 and thyristor S6 are cut
Only, compensator transformer T3 forward direction connects, and offset voltage is+18%；When thyristor S6 and thyristor S11 is connected, thyristor S5
End with thyristor S12, compensator transformer T3 Opposite direction connection, offset voltage is -18%；When thyristor S5 and thyristor S6 is connected
When, when thyristor S11 and thyristor S12 cut-off or thyristor S11 and thyristor S12 are connected, thyristor S5 and thyristor S6
Cut-off, compensator transformer T3 primary are shorted, offset voltage 0；By the various combination of different S1~S12 on or off,
May be implemented from -26%~+26% with 2% be increased stepwise different offset voltages (such as: -26%, -24%, -
22%22%, 24%, 26%), it is identical that three-phase phase voltage compensates situation.
The control of polarity transformation circuits is executed by main control MCU circuit unit M7 by driving circuit, main control MCU circuit unit
M7 detects network voltage, output voltage and output electric current, and the conducting by controlling thyristor S1~S12 is combined with cut-off, reaches
The closed-loop control of output voltage realizes that output power is not fluctuated with the energy variation according to junior's power grid, reaches stable junior
The effect of network voltage.
Further, in embodiment, the polarity switching of the compensator transformer uses thyristor Super-zero control, makes to switch
During it is more stable, impact it is smaller, therefore device generate harmonic wave it is seldom, than the distribution system phase for the equipment not used
Than can more improve the power quality of user.
Further, the polarity selects thyristor for bidirectional thyristor, and bidirectional thyristor simplifies circuit design, volume
Smaller, overall cost is lower.
Further, the thyristor is SCR or BCR, both devices can meet the requirement of technical solution.
Further, the output control circuit unit cuts off output in over-voltage or/and overcurrent function, to junior's power grid
Equipment is protected.
Further, the voltage compensation transformer offset voltage is selected by 3 times of incremental manners, compared to using 2 times
Incremental manner, same amount of compensator transformer can obtain bigger adjustable range, and save cost.
Further, there are communication interface, the convenient monitoring devices with power grid master control room by the main control MCU circuit unit M7
Communication, the real-time monitoring of distribution network voltage level may be implemented completely, adjust algorithm accordingly according to power grid control policy development,
Improve the automatization level of distribution network.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (9)
1. a kind of grid nodes stable-pressure device, including grid nodes stable-pressure device input terminal, grid nodes stable-pressure device output end,
It is characterized in that, further including input voltage sample circuit unit (M1), compensator transformer assembled unit (M2), output current sample
Circuit unit (M3), output control circuit unit (M4), SCR drive circuit unit (M5), output voltage sampling circuit unit
(M6), main control MCU circuit unit (M7), key and display circuit unit (M8)；The main control MCU circuit unit (M7) includes
MCU, power circuit, filter circuit, input/output circuitry form MCU work system；The compensator transformer assembled unit
(M2) it is made of 3 single-phase voltage compensating units, the single-phase voltage compensating unit is by more voltage compensation transformers and correspondence
Inverter of voltage polarity composition, voltage compensation transformer secondary output winding, which is sequentially connected in series, outputs and inputs it in compensated line
Between, voltage compensation primary winding is powered by inverter of voltage polarity to voltage compensation transformer secondary output, and polarity is cut
The thyristor circuit that circuit uses high reliability is changed, the thyristor is controlled by main control MCU circuit unit (M7)；The electricity
Net node stable-pressure device input terminal is connect with input voltage sample circuit unit (M1), compensator transformer assembled unit (M2)；Institute
State compensator transformer assembled unit (M2) also with output current sampling circuit unit (M3), SCR drive circuit unit (M5), output
Voltage sampling circuit unit (M6) connection；The output current sampling circuit unit (M3) also with output control circuit unit (M4)
Connection；The output of the output control circuit unit (M4) connects grid nodes stable-pressure device output end；The main control MCU circuit
Unit (M7) respectively with input voltage sample circuit unit (M1), output current sampling circuit unit (M3), output control circuit
Unit (M4), SCR drive circuit unit (M5), output voltage sampling circuit unit (M6) and key and display circuit unit (M8)
Connection；The grid nodes stable-pressure device input terminal connects power grid main transformer low pressure outlet side；The stable-pressure device output end connection
Junior's power grid, junior's power grid are connected to electrical equipment or distributed generation resource.
2. a kind of grid nodes stable-pressure device as described in claim 1, which is characterized in that the single-phase voltage compensating unit
Compensator transformer is 3, is sequentially connected in series the input terminal in phase line, and compensator transformer (T1) offset voltage is voltage rating
2%, compensator transformer (T2) offset voltage be voltage rating 6%, compensator transformer (T3) offset voltage be it is specified
The 18% of voltage, the precision of voltage regulation after 3 compensator transformers combination is 2%, and voltage stabilized range is ± 26%.
3. a kind of grid nodes stable-pressure device as described in claim 1, which is characterized in that the polarity of the compensator transformer is cut
It changes using thyristor Super-zero control.
4. a kind of grid nodes stable-pressure device as claimed in claim 3, which is characterized in that it is double that the polarity, which selects thyristor,
To thyristor.
5. a kind of grid nodes stable-pressure device as claimed in claim 4, which is characterized in that the thyristor is SCR or BCR.
6. a kind of grid nodes stable-pressure device as claimed in claim 3, which is characterized in that the control of polarity transformation circuits by
MCU is executed by driving circuit, and MCU exports electric current and output voltage according to network voltage to determine that every phase thyristor polarity becomes
The conducting for changing circuit (S1~S12) is combined with cut-off, realizes the closed-loop control of output voltage.
7. a kind of grid nodes stable-pressure device as described in claim 1, which is characterized in that the output control circuit unit exists
Output is cut off when output overvoltage or/and overcurrent.
8. a kind of grid nodes stable-pressure device as claimed in claim 2, which is characterized in that the voltage compensation transformer compensation
Voltage is selected by 3 times of incremental manners.
9. a kind of grid nodes stable-pressure device as described in any of the claims 1 to 8, which is characterized in that the main control MCU circuit
There are communication interfaces for unit (M7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820504982.1U CN208423799U (en) | 2018-04-10 | 2018-04-10 | A kind of grid nodes stable-pressure device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820504982.1U CN208423799U (en) | 2018-04-10 | 2018-04-10 | A kind of grid nodes stable-pressure device |
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| Publication Number | Publication Date |
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| CN208423799U true CN208423799U (en) | 2019-01-22 |
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| CN201820504982.1U Active CN208423799U (en) | 2018-04-10 | 2018-04-10 | A kind of grid nodes stable-pressure device |
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