CN216086162U

CN216086162U - Economical three-phase alternating current voltage stabilizing device

Info

Publication number: CN216086162U
Application number: CN202121652011.XU
Authority: CN
Inventors: 张谋龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-03-18
Anticipated expiration: 2031-07-20

Abstract

The utility model relates to the field of power technology, is widely applied to a voltage regulating and stabilizing device, and particularly relates to an economical three-phase alternating-current voltage stabilizing device which is safe, reliable and good in voltage regulating effect.

Description

Economical three-phase alternating current voltage stabilizing device

Technical Field

The utility model relates to the field of electric power technology, is widely applied to voltage regulating and stabilizing devices, and particularly relates to an economical three-phase alternating-current voltage stabilizing device.

Background

Electric power is one of the most important energy sources used in modern industry, agriculture and modern society life, voltage changes widely affect various industrial electric equipment, and a large number of users in various countries are far away from power supply points, and particularly serious undervoltage exists in countries and regions behind economy.

The electricity is a product of the civilized society, and promotes the development of the civilized society, the use degree of the electricity is closely related to the civilized society, the index of the civilized society is that the scientific technology develops rapidly, the socialization degree of the production is higher, the production scale is larger and larger, the technical requirement is more and more complex, the division of labor is more and more detailed, and the coordination of each production link is more and more important. It is worth mentioning that the low voltage has the most serious influence on modern industry, agriculture and modern society life, which affects the output power and service life of electrical equipment, increases the power consumption, reduces or rejects the product quality, reduces the yield, damages the equipment, even forces to stop production, and also affects the power system: the lower the voltage is, the lower the stable power limit is, and the lower the difference value (i.e. power reserve) between the power limit and the line output power is, the more unstable phenomenon is easy to occur, and even a major accident that the power supply system is broken down can be caused.

The voltage problem includes the following cases:

voltage deviation: the operation voltage value is within the range of +/-10% of the rated voltage value;

under voltage: the operation voltage value is within the range of 90-80% of the rated voltage value, and the voltage change lasts for more than 1 minute;

③ overvoltage: the operation voltage value is within the range of 110-120% of the rated voltage value, and the voltage change lasts for more than 1 minute;

fourthly, short-time undervoltage, wherein the time range is 3 seconds to 1 minute;

short-time overvoltage, wherein the time range is 3 seconds to 1 minute;

sixthly, the three-phase voltage unbalance is that the unevenness of the running three-phase voltage is more than or equal to 2 percent, and the unevenness of the running three-phase voltage is more than or equal to 4 percent in short time.

According to the safety voltage requirement of the electric equipment, namely the voltage difference change of the end voltage of the electric equipment is +/-5%, and the unbalance degree of the three-phase voltage is less than or equal to 2.6%. Some requirements are higher, namely the voltage difference change of the terminal of the electric equipment is less than or equal to 2.5 percent. The voltage regulating devices in the current market only comprise an unloaded voltage regulating transformer, an loaded voltage regulating transformer, reactive compensation equipment, a VQC voltage reactive control device, an induction type voltage regulator and a carbon brush type alternating current voltage stabilizer; firstly, the no-load voltage regulating transformer has low cost and reliable performance, but cannot be synchronously adjusted along with the voltage change and can only be adjusted after power failure; the on-load tap changer can be synchronously adjusted along with the voltage change, but is provided with an on-load tap changer, so that the generation of electric arcs is difficult to avoid when the voltage is adjusted, and the on-load tap changer needs to be maintained frequently; the reactive compensation equipment has reliable performance, but only can repair the voltage change caused by reactive power, but can not repair the voltage change caused by active power; the VQC voltage reactive power control device can ensure the voltage quality, optimize the reactive power flow of the power grid, play an important role in the economic operation of the power grid and the like, and the continuous working safety time of the VQC voltage reactive power control device is less than or equal to 1000 hours; although the induction type voltage regulator is reliable, the response speed is slow and is less than or equal to 5V/S, the efficiency is low and is less than or equal to 93 percent, and the voltage-stabilizing precision is poor and is less than or equal to 5 percent; and sixthly, the voltage regulating speed of the carbon brush type alternating current voltage stabilizer is less than or equal to 25V/S, and regular maintenance is needed.

The applicant finds that the no-load voltage regulating transformer can not be synchronously regulated along with the voltage change, and can only be regulated after power failure, so that the no-load voltage regulating transformer is troublesome to use and cannot play an effective voltage stabilizing role. It has also been found that as the input voltage decreases, the winding current increases, with winding losses increasing in proportion to the square of the current, for the same power delivered; secondly, when the on-load tap changer adjusts the voltage, the on-load tap changer is difficult to avoid generating no electric arc. It is also found that if the maintenance is not timely, short-time undervoltage of power supply can be caused, so that advanced power utilization equipment stops working or is damaged, even voltage breakdown of a power supply system can be caused, and adverse effects are brought to production, operation and working life of the power utilization area; and thirdly, the reactive compensation equipment cannot repair voltage change caused by active power. It has also been found that the capacitance reactive power is proportional to the square of the voltage, that a voltage decrease greatly reduces the reactive power output, and that a voltage increase, although the reactive power increases, enhances partial discharge due to field enhancement, and reduces the insulation life. If operated for a long period of time at 1.1UN, the life is reduced to approximately 44% of the rated life. It is also found that the phenomena of explosion of the capacitor and bulging of the shell are caused by partial discharge and insulation aging accumulation, so that the low voltage and the high voltage also seriously affect the expected service life of the reactive power compensation device and the safe operation of power supply; and fourthly, the VQC voltage reactive power control device can cause short-time undervoltage of power supply if the continuous working safety time is more than or equal to 1000 hours and the maintenance is not timely, so that advanced power utilization equipment stops working or is damaged, and even a power supply system in the power utilization area is collapsed. Meanwhile, the root causes of the third step are caused by unreasonable voltage-regulating tap joints of the power transformer and unreliable on-load voltage-regulating tap joint switches; an induction type voltage regulator with slow response speed less than or equal to 5V/S, low efficiency less than or equal to 93 percent and poor voltage stabilization precision less than or equal to 5 percent; and sixthly, the voltage regulating speed of the carbon brush type alternating current voltage stabilizer is less than or equal to 25V/S, and regular maintenance is needed. It has also been found that if the carbon brush is not regularly maintained, when the wear of the carbon brush is severe, the copper pillars are burned off and the power supply is affected, and a safety accident is caused if the wear is severe.

In view of the above technical problems, the applicant invented: the present invention relates to a three-phase ac voltage stabilizer, and more particularly, to a three-phase ac voltage stabilizer, which comprises a first three-phase high voltage regulator, a second high voltage regulator, a third three-phase low voltage compensator, a fourth low voltage compensator, a fifth voltage quality repairing device, a sixth economical three-phase ac voltage stabilizer, and a seventh economical ac voltage stabilizer.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the economical three-phase alternating-current voltage stabilizing device which is simple to operate, safe and reliable and has a good voltage regulating effect.

The technical scheme of the utility model is as follows: an economical three-phase alternating-current voltage stabilizing device comprises a plurality of three-phase compensators which are connected in series, wherein each group of three-phase compensators comprises a primary winding TR, a primary winding TS, a primary winding TT, a primary winding TN and a secondary winding.

In a further improvement, the bidirectional thyristor comprises a triac SCRNU1, a triac SCRNU2, a triac SCRNV1, a triac SCRNV2, a triac SCRNT1, a triac SCRNT2, a triac SCRNN1, a triac SCRNN2, a triac SCRNN3, a triac SCRNN4, and a triac SCRNN4, the primary winding TR is connected to one end of the triac SCRNU 4 and the triac SCRNN4, the primary winding TS is connected to one end of the triac SCRNN4 and the triac SCRNN4, the other end of the triac SCRNN4 and the triac SCRNN4 is connected to one end of the triac SCRNN4 and the triac SCRNN4, the other end of the triac SCRNW1 is connected to one end of the triac SCRNN11 and SCRNN12, the other end of the triac SCRNU2 is connected to one end of the triac SCRNN1 and one end of the triac SCRNN2, the other end of the triac SCRNV2 is connected to one end of the triac SCRNN5 and one end of the triac SCRNN6, the other end of the triac SCRNW2 is connected to one end of the triac SCRNN9 and one end of the triac SCRNN10, the three-phase protection circuit further includes a three-phase control protection switch, the other end of the triac SCRNN1 is connected to one end of the three-phase control protection switch a phase, the other end of the triac SCRNN2 is connected to the thyristor SCRNU2, the other end of the triac SCRNN3 is connected to one end of the three-phase control protection switch a phase, the other end of the triac SCRNN4 is connected to the other end of the triac SCRNN1, and the other end of the triac SCRNN5 is connected to one end of the three-phase control protection switch B phase, the other end of the bidirectional thyristor SCRNN6 is connected to the thyristor SCRNV2, the other end of the bidirectional thyristor SCRNN7 is connected to one end of the B phase of the three-phase control protection switch, the other end of the bidirectional thyristor SCRNN8 is connected to the other end of the bidirectional thyristor SCRNV1, the other end of the bidirectional thyristor SCRNN9 is connected to one end of the C phase of the three-phase control protection switch, the other end of the bidirectional thyristor SCRNN10 is connected to the thyristor SCRNW2, the other end of the bidirectional thyristor SCRNN11 is connected to one end of the C phase of the three-phase control protection switch, and the other end of the bidirectional thyristor SCRNN12 is connected to the other end of the bidirectional thyristor SCRNW 1.

In a further improvement, the bidirectional thyristor SCRNU2 further comprises a suppressor HFU, a suppressor HFV and a suppressor HFW, the primary winding TR is further connected to one end of the suppressor HFU, the primary winding TS is further connected to one end of the suppressor HFV, the primary winding TT is further connected to one end of the suppressor HFW, the other end of the bidirectional thyristor SCRNU2 is further connected to the other end of the suppressor HFU, the other end of the bidirectional thyristor SCRNV2 is further connected to the other end of the suppressor HFV, and the other end of the bidirectional thyristor SCRNW2 is further connected to the other end of the suppressor HFW.

In a further improvement, the bidirectional thyristor SCRNN-type rectifier circuit further comprises an input N line, the input N line is connected with a primary winding TN, and the primary winding TN is connected with one end of the bidirectional thyristor SCRNN2, the bidirectional thyristor SCRNN4, the bidirectional thyristor SCRNN6, the bidirectional thyristor SCRNN8, the bidirectional thyristor SCRNN10 and the bidirectional thyristor SCRNN 12.

The improved touch screen comprises an operating system, a master control system and a driving system, wherein the three-phase input voltage, the three-phase input current, the three-phase output voltage, the three-phase output current and each group of three-phase compensators are connected to the master control system, the operating system and the driving system are connected to the master control system, the operating system is a touch screen operation interface, and the master control system controls the three-phase compensators to work through the driving system.

In a further improvement, the system also comprises a combination of at least 1 three-phase compensator connected in series or in parallel.

By adopting the technical scheme, the utility model has the beneficial effects that: the utility model provides a

An economical three-phase AC voltage stabilizer is shown in an attached figure 1 in detail, when power is on or input voltage is equal to rated voltage, a main control system controls a bidirectional thyristor SCRNN1, an SCRNN2, an SCRNN3, an SCRNN4 and an SCRNU1 to be turned off and is turned on an SCRNU2, a primary winding TR and a primary winding TN are in short circuit, and meanwhile, the other two groups are consistent with the working principle of the groups, so that the input voltage is equal to output voltage. When the input voltage is lower than the rated voltage, the main control system controls the bidirectional thyristors SCRNN1, SCRNN4 and SCRNU2 to be switched off, and switches on the SCRNU1, SCRNN2 and SCRNN3, so that the primary winding performs voltage compensation on the secondary winding, and the other two groups are consistent with the working principle of the primary winding and the secondary winding, so that the output voltage is equal to the rated voltage. When the input voltage is higher than the rated voltage value, the main control system controls the bidirectional thyristors SCRNN3, SCRNN2 and SCRNU2 to be turned off and is turned on SCRNU1, SCRNN4 and SCRNN1 to offset the voltage of the primary winding to the secondary winding, and the other two groups are consistent with the working principle of the groups, so that the output voltage is equal to the rated voltage value.

The utility model has simple control, safety and reliability, 100 milliseconds of threshold value, 20 percent of voltage stabilizing range, 3 percent of voltage stabilizing precision, more than or equal to 99.3 percent of efficiency, less than or equal to 2000KVA of rated capacity, overvoltage protection, undervoltage protection, three-phase unbalance protection and the like. Can make up the deficiency of products on the market.

Drawings

Fig. 1 is a schematic circuit diagram of an economical three-phase ac voltage regulator according to an embodiment of the present invention;

FIG. 2 is a diagram of an interface of the human machine system device of the embodiment of the utility model shown in FIG. 1;

FIG. 3 is a diagram of an interface of the human machine system device of an embodiment of the utility model shown in FIG. 2;

FIG. 4 is a diagram of an interface of the human-machine system device in an embodiment of the utility model shown in FIG. 3.

Detailed Description

The utility model is described in further detail below with reference to the following figures and detailed description:

as shown in fig. 1, an economical three-phase ac voltage stabilizer includes a plurality of three-phase compensators connected in series, each of the three-phase compensators includes a primary winding TR, a primary winding TS, a primary winding TT, a primary winding TN, and a secondary winding. The bidirectional thyristor SCRNU1 and one end of the bidirectional thyristor SCRNU2 are connected to the primary winding TR, the bidirectional thyristor SCRNV1 and one end of the bidirectional thyristor SCRNV2 are connected to the primary winding TT, one ends of the bidirectional thyristor SCRNT1 and the bidirectional thyristor SCRNT2 are connected to the primary winding TS, the other end of the bidirectional thyristor SCRNU1 is connected to one ends of the bidirectional thyristor SCRNN3 and the bidirectional thyristor SCRNN4, the other end of the bidirectional thyristor SCRNV1 is connected to one ends of the bidirectional thyristor SCRNN7 and the bidirectional thyristor SCRNN8, the other end of the bidirectional thyristor SCRNW1 is connected to one ends of the bidirectional thyristor SCRNN11 and the bidirectional thyristor SCRNN12, the other end of the bidirectional thyristor SCRNU2 is connected to one ends of the bidirectional thyristor SCRNN1 and the bidirectional thyristor SCRNN2, the other end of the bidirectional thyristor SCRNV2 is connected to one end of the bidirectional thyristor SCRNN 8646 and the bidirectional thyristor SCRNN 86 9, the three-phase thyristor controlled protection circuit is characterized by further comprising a three-phase controlled protection switch, the other end of the bidirectional thyristor SCRNN1 is connected with one end of a three-phase controlled protection switch A phase, the other end of the bidirectional thyristor SCRNN2 is connected with a thyristor SCRNU2, the other end of the bidirectional thyristor SCRNN3 is also connected with one end of the three-phase controlled protection switch A phase, the other end of the bidirectional thyristor SCRNN4 is connected with the other end of the bidirectional thyristor SCRNU1, the other end of the bidirectional thyristor SCRNN5 is connected with one end of a three-phase controlled protection switch B phase, the other end of the bidirectional thyristor SCRNN6 is connected with a thyristor SCRNV2, the other end of the bidirectional thyristor SCRNN7 is also connected with one end of the three-phase controlled protection switch B phase, the other end of the bidirectional thyristor SCRNN8 is connected with the other end of the bidirectional thyristor SCRNV1, the other end of the bidirectional thyristor SCRNN9 is connected with one end of the three-phase controlled protection switch C phase, and the other end of the bidirectional thyristor SCRNN10 is connected with the SCRNW2, the other end of the bidirectional thyristor SCRNN11 is also connected to one end of the C phase of the three-phase control protection switch, and the other end of the bidirectional thyristor SCRNN12 is connected to the other end of the bidirectional thyristor SCRNW 1. The primary winding TR is also connected with one end of a suppressor HFU, the primary winding TS is also connected with one end of a suppressor HFV, the primary winding TT is also connected with one end of a suppressor HFW, the other end of the bidirectional thyristor SCRNU2 is also connected with the other end of the suppressor HFU, the other end of the bidirectional thyristor SCRNV2 is also connected with the other end of the suppressor HFV, and the other end of the bidirectional thyristor SCRNW2 is also connected with the other end of the suppressor HFW. The bidirectional thyristor SCRNN12 is connected with a primary winding TN, and the primary winding TN is connected with the other ends of the bidirectional thyristor SCRNN2, the bidirectional thyristor SCRNN4, the bidirectional thyristor SCRNN6, the bidirectional thyristor SCRNN8, the bidirectional thyristor SCRNN10 and the bidirectional thyristor SCRNN 4. Still include operating system, major control system, actuating system, three-phase input voltage, electric current and three-phase output voltage, electric current and each group three-phase compensator all connect in major control system, operating system and actuating system all connect in major control system, operating system is touch screen operation interface, major control system passes through actuating system control three-phase compensator work. Fig. 2-4 are interface diagrams of the man-machine system device of the present invention, including voltage display, current display, technical parameter setting display, technical parameter resetting, and main view display: the input voltage comprises a current value, a maximum value and a minimum value which are automatically recorded in real time, the output voltage comprises a current value, a maximum value and a minimum value which are automatically recorded in real time, the current comprises a current value and a maximum value and a minimum value which are automatically recorded in real time, the technical parameter setting display comprises a rated voltage value, a voltage-stabilizing precision value, a voltage-stabilizing threshold value setting value, a voltage regulation mode, a working mode, an abnormal three-phase unbalance protection value, an abnormal overvoltage protection value, an abnormal undervoltage protection value, an input fault processing mode and a voltage-stabilizing fault processing mode, and the technical parameter resetting comprises a rated voltage value, a voltage-stabilizing precision value, a voltage-stabilizing threshold value setting value, a voltage regulation mode, a working mode, an abnormal three-phase unbalance protection value, an abnormal overvoltage protection value, an abnormal undervoltage protection value, "input fault processing mode" and "voltage stabilization fault processing mode".

The utility model relates to an economical three-phase alternating-current voltage stabilizing device, which also comprises a combination of at least 1 three-phase compensator connected in series or in parallel. Are also within the scope of the present invention.

The working principle is as follows: when the power is on or the input voltage is equal to the rated voltage, the main control system controls the bidirectional thyristors SCRNN1, SCRNN2, SCRNN3, SCRNN4 and SCRNU1 to be switched off, and switches on the SCRNU2 to short-circuit the primary winding TR and the primary winding TN, and the other two groups are consistent with the working principle of the groups to enable the input voltage to be equal to the output voltage. When the input voltage is lower than the rated voltage, the main control system controls the bidirectional thyristors SCRNN1, SCRNN4 and SCRNU2 to be switched off, and switches on the SCRNU1, SCRNN2 and SCRNN3, so that the primary winding performs voltage compensation on the secondary winding, and the other two groups are consistent with the working principle of the primary winding and the secondary winding, so that the output voltage is equal to the rated voltage. When the input voltage is higher than the rated voltage value, the main control system controls the bidirectional thyristors SCRNN3, SCRNN2 and SCRNU2 to be turned off and is turned on SCRNU1, SCRNN4 and SCRNN1 to offset the voltage of the primary winding to the secondary winding, and the other two groups are consistent with the working principle of the groups, so that the output voltage is equal to the rated voltage value.

The present invention has been described in detail with reference to the specific embodiments, but these should not be construed as limitations of the present invention, and many modifications and improvements can be made by those skilled in the art without departing from the principle of the present invention, which should also be construed as the protection scope of the present invention.

Claims

1. The utility model provides an economical three-phase alternating current voltage stabilizing device which characterized in that: the three-phase compensator comprises a plurality of three-phase compensators which are connected in series, wherein each group of three-phase compensators comprises a primary winding TR, a primary winding TS, a primary winding TT, a primary winding TN and a secondary winding.

2. An economical three-phase ac voltage stabilizer according to claim 1, characterized in that: further comprising a triac SCRNU1, a triac SCRNU2, a triac SCRNV1, a triac SCRNV2, a triac SCRNT1, a triac SCRNT2, a triac SCRNN1, a triac SCRNN2, a triac SCRNN3, a triac SCRNN4, and a triac SCRNN4, the primary winding TR is connected to one end of the triac SCRNV 4 and the triac SCRNN4, the primary winding TS is connected to one end of the triac SCRNV 4 and the triac SCRNV 4, the primary winding is connected to one end of the triac SCRNV 4 and the triac SCRNN4, the other end of the triac SCRNN4 and the triac SCRNN4 is connected to one end of the triac SCRNN4, the other end of the triac SCRNW1 is connected to one end of the triac SCRNN11 and SCRNN12, the other end of the triac SCRNU2 is connected to one end of the triac SCRNN1 and one end of the triac SCRNN2, the other end of the triac SCRNV2 is connected to one end of the triac SCRNN5 and one end of the triac SCRNN6, the other end of the triac SCRNW2 is connected to one end of the triac SCRNN9 and one end of the triac SCRNN10, the three-phase protection circuit further includes a three-phase control protection switch, the other end of the triac SCRNN1 is connected to one end of the three-phase control protection switch a phase, the other end of the triac SCRNN2 is connected to the thyristor SCRNU2, the other end of the triac SCRNN3 is connected to one end of the three-phase control protection switch a phase, the other end of the triac SCRNN4 is connected to the other end of the triac SCRNN1, and the other end of the triac SCRNN5 is connected to one end of the three-phase control protection switch B phase, the other end of the bidirectional thyristor SCRNN6 is connected to the thyristor SCRNV2, the other end of the bidirectional thyristor SCRNN7 is connected to one end of the B phase of the three-phase control protection switch, the other end of the bidirectional thyristor SCRNN8 is connected to the other end of the bidirectional thyristor SCRNV1, the other end of the bidirectional thyristor SCRNN9 is connected to one end of the C phase of the three-phase control protection switch, the other end of the bidirectional thyristor SCRNN10 is connected to the thyristor SCRNW2, the other end of the bidirectional thyristor SCRNN11 is connected to one end of the C phase of the three-phase control protection switch, and the other end of the bidirectional thyristor SCRNN12 is connected to the other end of the bidirectional thyristor SCRNW 1.

3. An economical three-phase ac voltage stabilizer according to claim 2, characterized in that: the primary winding TR is also connected with one end of the inhibitor HFU, the primary winding TS is also connected with one end of the inhibitor HFV, the primary winding TT is also connected with one end of the inhibitor HFW, the other end of the bidirectional thyristor SCRNU2 is also connected with the other end of the inhibitor HFU, the other end of the bidirectional thyristor SCRNV2 is also connected with the other end of the inhibitor HFV, and the other end of the bidirectional thyristor SCRNW2 is also connected with the other end of the inhibitor HFW.

4. An economical three-phase ac voltage stabilizer according to claim 3, characterized in that: the bidirectional thyristor SCRNN12 is connected with a primary winding TN, and the primary winding TN is connected with one end of a bidirectional thyristor SCRNN2, a bidirectional thyristor SCRNN4, a bidirectional thyristor SCRNN6, a bidirectional thyristor SCRNN8, a bidirectional thyristor SCRNN10 and a bidirectional thyristor SCRNN 4.

5. An economical three-phase ac voltage stabilizer according to claim 4, characterized in that: the three-phase compensator comprises a main control system, a driving system, three-phase input voltage, three-phase input current, three-phase output voltage, three-phase output current and three-phase compensators, wherein the three-phase compensators are connected to the main control system, the operating system and the driving system are connected to the main control system, the operating system is a touch screen operation interface, and the main control system controls the three-phase compensators to work through the driving system.

6. An economical three-phase ac voltage stabilizer according to claim 5, characterized in that: the system also comprises a combination of at least 1 three-phase compensator connected in series or in parallel.