CN112350204A

CN112350204A - Movable transformer substation

Info

Publication number: CN112350204A
Application number: CN202011120429.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2021-02-09
Also published as: CN110957659A; CN110957659B; CN112467587A

Abstract

The invention discloses a movable transformer substation, which is connected with a commercial power end and a user end, wherein the movable transformer substation comprises a movable vehicle and a transformer, a carriage of the movable vehicle is divided into a low-voltage chamber, a transformer chamber and a high-voltage chamber, the transformer is arranged in the transformer chamber, the commercial power end is arranged in the high-voltage chamber, the user end is arranged in the low-voltage chamber, the transformer comprises a primary end and a secondary end, the primary end is connected with the commercial power end, and the secondary end is connected with the user end. The movable transformer substation further comprises a reactive power phase angle detection module and a reactive power compensation module, the reactive power compensation module comprises a capacitor module and an adjustable inductor, the capacitor module and the adjustable inductor are connected in parallel to the secondary end respectively, the reactive power phase angle detection module is installed on a main road of the secondary end, the reactive power phase angle detection module detects a main road power factor value and transmits a signal to the adjustable inductor, and the adjustable inductor adjusts the inductance value of the adjustable inductor to enable the main road power factor of the secondary end to tend to 1.

Description

Movable transformer substation

Technical Field

The invention relates to the field of power supply transmission, in particular to a movable transformer substation.

Background

The transformer substation is an important part in an electric power system, and in the prior art, most transformer substations are box-type transformer substations built by concrete, so that the building period is long, and the investment and the use are slow.

In some occasions, for example, construction sites of regions far away from urban areas, large-scale activities with high load power consumption and local transformer substations with insufficient capacity, or after a certain transformer substation is in fault, the transformer substations which need to be repaired but cannot be repaired in time need to be assisted to be used for temporary power transformation, a power transformation device which can be used for connecting a commercial power and a user end is needed in the occasions, and the transformer substations need to be reliable and safe to work and can not respond quickly.

Disclosure of Invention

The invention aims to provide a mobile substation to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a city electricity end and user are connected to portable transformer substation, portable transformer substation includes locomotive, transformer, separates into low-pressure chamber, transformer room and hyperbaric chamber in the locomotive carriage, and the transformer setting is in the transformer room, and the commercial power end sets up in the hyperbaric chamber, and the user sets up in the low-pressure chamber, and the transformer includes primary end and secondary, and the city electricity end is connected to the primary end, and the user is connected to the secondary.

The mobile substation is used as a power transformation device of a final stage, and is mainly used for large power consumption occasions of outdoor occasions and isolation of a mobile generator set and user sides, for example, construction sites of remote areas far away from urban areas sometimes use power of nearby power grids, sometimes supply power through the generator set, for example, the diesel generator set generates power, the power is transmitted to users through the mobile substation one by one, the generator set is isolated from loads on the user side, and the generator set is protected. The movable transformer substation is built on a movable vehicle and can be conveniently shifted.

Furthermore, the movable transformer substation further comprises a reactive phase angle detection module and a reactive compensation module, the reactive compensation module comprises a capacitor module and an adjustable inductor, the capacitor module and the adjustable inductor are respectively connected to the secondary end in parallel, the reactive phase angle detection module is installed on a main path of the secondary end, the reactive phase angle detection module detects a main path power factor value and transmits a signal to the adjustable inductor, and the adjustable inductor adjusts the inductance value of the adjustable inductor to enable the main path power factor of the secondary end to tend to 1.

When a user uses electricity, a lot of reactive power is often generated, the reactive power comes from some inductive loads on the electricity utilization equipment, a common motor such as a motor has a large inductive load, the working principle of the motor is to use the action of a magnetic field to do work, so many inductive loads cannot be avoided, the inductive loads do not consume power, the reactive power and the active power consumed by resistance type are added in a vector manner and then are transmitted on a power grid as apparent power, although a user end only consumes the active power, but the reactive power exists to enable a part of the total power of the power grid to be occupied, so that the reactive power cannot be used in other electricity utilization places, when the reactive current flows on the circuit, the circuit has a tiny resistor to generate heat, so that a small amount of energy loss can be generated, when the reactive current is large, the loss is also large, and a parameter of a power factor exists when the proportion of the reactive power and the active power is evaluated, the power factor is equal to the ratio of the active power to the apparent power, when the power factor is close to 1, that is, it indicates that the reactive power is cancelled, the inductive load cannot avoid but can cancel, in the prior art, the power factor is generally performed by connecting capacitors in parallel, the phase angle of the inductive current lags behind the phase angle of the resistive current by 90 degrees, while the capacitive current leads by 90 degrees, and by connecting equivalent capacitive loads in parallel at the inductive load, only the resistive current exists in the current main circuit, and the power factor becomes 1. The invention obtains the power factor on the main circuit through the reactive phase angle detection module, when the power factor changes because of the load change of the user terminal, the adjustable inductance is adjusted to match with the load, so that the power factor of the main circuit becomes 1 again, according to the above, most of the user terminal except the resistive load has complicated inductance, the invention becomes capacitive current by connecting an excess capacitor in parallel on the secondary terminal in advance, then the capacitance exceeding the capacitor module is offset by adjusting the inductance of the adjustable inductance, because the capacitance of the capacitor module is inconvenient to be adjusted continuously, the inductance is selected as the object of continuous adjustment, so that the total power factor on the circuit can be very close to 1.

Furthermore, the adjustable inductor comprises an iron core, an alternating current coil, an excitation coil and a direct current loop, wherein the alternating current coil and the excitation coil are respectively sleeved on the iron core, two ends of the alternating current coil are connected with a secondary end in parallel, the excitation coil is used as a part of the direct current loop, the direct current loop changes the current in the excitation coil by changing the power supply voltage or changing the resistance value on the circuit, and the direct current loop receives an adjusting signal transmitted by the reactive phase angle detection module.

The inductance value of the adjustable inductor is continuously changed by changing exciting current, an alternating current coil is connected in parallel to a secondary end power grid to serve as an inductive load, the saturation degree of magnetic lines of force emitted by an iron core arranged in the center of the alternating current coil can influence the inductance value of the alternating current coil, the saturation degree of the magnetic lines of force of the iron core is changed by an exciting coil, direct current is introduced into the exciting coil, and the direct current can conveniently change the current by changing voltage or resistance on a circuit. In the operation process: the direct current loop obtains signals from the reactive phase angle detection module, changes the current of the direct current loop, influences the magnetism of an iron core, changes the inductance value of the alternating current coil to enable the inductance value to be matched with other loads on the secondary end, and changes the power factor on the secondary end into 1, so that necessary power is obtained only from the commercial power end, unnecessary reactive power is completely eliminated, and the effect of local compensation of the power factor is maximized.

Further, the reactive phase angle detection module comprises a voltage transformer, a current transformer, a first operational amplifier Y1, a second operational amplifier Y2, a triode S, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein the base of the triode S is connected with the output end of the second operational amplifier Y2, the collector of the triode S is connected with the positive input end of the first operational amplifier Y1, the emitter of the triode S is grounded, one end of the fifth resistor R5 is connected with the output end of the second operational amplifier Y2, one end of the fifth resistor R5 is grounded, the positive input end of the second operational amplifier Y2 is grounded, the negative input end of the first operational amplifier Y1 is connected with the first resistor R1, the positive input end of the first operational amplifier Y1 is connected with the second resistor R2, the other ends of the first resistor R1 and the second resistor R2 are connected to form a common end, the negative input end of the first operational amplifier Y1 is further connected with the output end of the third resistor R5 through the negative input end of the first operational amplifier Y5857323, the voltage transformer is connected in parallel to the secondary end to obtain a voltage signal u0 of a main circuit on the user end, a signal u0 is loaded to the negative input end of the second operational amplifier Y2, the current transformer is arranged on a live wire of the secondary end to obtain a total current signal ux of the main circuit on the user end, the signal ux is loaded to the common end of the first resistor R1 and the second resistor R2, and a measurement signal uf output by the output end of the first operational amplifier Y1 is transmitted to the adjustable inductor.

When the compensation is not considered, the secondary terminal voltage u0 is used as an original driving voltage, a current fluctuation curve of the secondary terminal voltage u0 is used as a reference line, alternating current is in sinusoidal variation, total path current detected by a current transformer is current superposition of a plurality of loads, the current is converted into an equal proportion level signal ux through a resistor after being acquired by the current transformer, a basic variation curve is also a sinusoidal curve, the degree of u0 lagging on the phase is an angle theta, the cosine of the theta is a power factor in the circuit, u0 and ux respectively enter a processor of a reactive phase angle detection module, u0 is used as a reference signal and loaded on a second operational amplifier Y2, a second operational amplifier Y2 is a reverse amplifier, when u0 is a high level, the output end of the second operational amplifier Y2 is a low level, a triode S is cut off, the negative input end of the first operational amplifier Y1 is grounded through R4, and the first operational amplifier Y1 is used as a forward amplifier, if and ux are in the same direction, when u0 is at low level, the output end of the second operational amplifier Y2 is at high level, the triode S is conducted, the positive input end of the first operational amplifier Y1 is preferentially grounded, the first operational amplifier Y1 is used as a reverse amplifier, if and ux are in reverse direction,

in the specific values: and setting the effective level of Ux as Ux, then:

wherein:

a1 is the amplification factor when Y1 is used as a forward amplifier, a1= R3/R4+ 1;

a2 is the amplification factor when Y1 is used as an inverting amplifier, a2= R3/R1;

for the convenience and uniformity of subsequent calculation, the resistances of R1, R3 and R4 are fully adjusted to ensure that A1= A2 and are uniformly an amplification factor A;

and (3) spreading and sorting the uf Fourier decomposition to obtain:

the cosine of the phase difference angle theta between ux and u0 is the power factor, and uf includes the DC component

And a number of alternating current variations, the average of which

The power factor is included in the secondary side, so that the power factor on the main circuit of the secondary side can be measured by using uf, and after the power factor is obtained, the adjustable inductor is adjusted to enable the power factor cos theta to be 1 again.

Preferably, the movable vehicle further comprises a heat dissipation fan, ventilation openings are formed in the upper portions of the low-pressure chamber and the high-pressure chamber, and the heat dissipation fan is installed on the ventilation opening of one of the low-pressure chamber and the high-pressure chamber and blows air outwards. The heat dissipation fan and the ventilation opening provide heat dissipation guarantee for the internal electric components.

Preferably, rain-proof covers are arranged outside the ventilation openings at the upper parts of the low-pressure chamber and the high-pressure chamber. The rain cover prevents rainwater from entering the carriage.

Preferably, the low pressure chamber is close to the cab of the mobile vehicle, and the high pressure chamber is far from the cab of the mobile vehicle. The high-pressure chamber is relatively heavy, the heat dissipation requirement is higher, the danger is higher relative to the low-pressure chamber, the high-pressure chamber is far away from the cab, and unnecessary electromagnetic interference with the cab is prevented.

As optimization, the capacitor module is detachable, and a plurality of capacitor modules with different capacities are stored in the mobile vehicle. The capacity of the capacitor module is larger than the inductive load of the user terminal and a small range of adjustment margin is reserved to be the adjustment range of the adjustable inductor, if the capacity of the capacitor module exceeds the amount of the user terminal, the adjustment range of the adjustable inductor is not enough, and if the capacity of the capacitor module is less than the amount of the user terminal, the capacitive load cannot be perfectly provided, so that the power factor on the main circuit cannot reach 1, and the capacitor modules with various specifications are configured for capacity replacement and combination.

As optimization, the upper part of a carriage of the moving vehicle is provided with a lightning rod, and the bottom of the moving vehicle is provided with a telescopic grounding column. The grounding of the device can directly use the ground wire on the commercial power end, but the appearance of the mobile vehicle is further grounded, so that the behaviors of leakage protection and the like can be performed more safely.

Compared with the prior art, the invention has the beneficial effects that: the invention arranges the transformer substation on a movable vehicle, thereby providing transformation service at any place; by power factor detection and reactive compensation, reactive power of a user side can be offset, occupation of the load on a power grid is reduced to the maximum extent, and only necessary active power is consumed; the power factor of the sum of all loads on the secondary end can be accurately adjusted to be equal to 1 through excessive parallel capacitors and continuously adjustable inductors; the adjustment of the inductance is realized in a mode that the excitation coil in a direct current mode is matched with the iron core and the alternating current coil, the adjustment of the inductance size is accurate, the sensitivity is high, and the situations of inductance spark and the like do not exist in an alternating current circuit without intervention.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic diagram of the circuit of the present invention;

FIG. 3 is view A of FIG. 2;

FIG. 4 is a schematic circuit diagram of the reactive phase angle detection module of the present invention;

FIG. 5 is a waveform diagram of signals u0, ux and uf according to the present invention.

In the figure: 1-transformer, 11-primary end, 12-secondary end, 3-voltage transformer, 4-current transformer, 5-capacitor module, 6-adjustable inductor, 61-iron core, 62-alternating current coil, 63-excitation coil, 64-direct current loop, 9-mobile vehicle, 91-low voltage chamber, 92-transformer chamber, 93-high voltage chamber, 94-cooling fan, 95-rain cover, 100-commercial power end and 200-user end.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a mobile substation connects a utility terminal 100 and a user terminal 200, the mobile substation includes a mobile vehicle 9 and a transformer 1, the compartment of the mobile vehicle 9 is divided into a low-voltage chamber 91, a transformation chamber 92 and a high-voltage chamber 93, the transformer 1 is disposed in the transformation chamber 92, the utility terminal 100 is disposed in the high-voltage chamber 93, the user terminal 200 is disposed in the low-voltage chamber 91, the transformer 1 includes a primary terminal 11 and a secondary terminal 12, the primary terminal 11 is connected to the utility terminal 100, and the secondary terminal 12 is connected to the user terminal 200.

The municipal power supply end 100 is connected with municipal power grid voltage of 10kV and 0.4kV, a transformer 1 with a proper voltage reduction ratio is selected and matched according to primary side 11 voltage which can be obtained particularly under a use place, the transformer can also adapt to different voltage reduction ratios through a modular combination connection mode of the transformer 1, a user side 200 outputs 220V two-phase power or 380V three-phase power, the mobile substation is used as a power transformation device of a final stage and is mainly used for large power consumption occasions of outdoor occasions and isolation of a mobile generator set and the user side, for example, construction sites of remote areas far away from urban areas sometimes use power of nearby power grids, sometimes supply power through the generator set, for example, the diesel generator set generates power, the power is transmitted to users one by one through the mobile substation, the generator set is isolated from loads on the user side, and the generator set is protected. The mobile substation is built on the mobile vehicle 9, and the position can be conveniently transferred.

The movable transformer substation further comprises a reactive power phase angle detection module and a reactive power compensation module, the reactive power compensation module comprises a capacitor module 5 and an adjustable inductor 6, the capacitor module 5 and the adjustable inductor 6 are connected in parallel to the secondary end 12 respectively, the reactive power phase angle detection module is installed on the main path of the secondary end 12, the reactive power phase angle detection module detects the main path power factor value and transmits a signal to the adjustable inductor 6, and the adjustable inductor 6 adjusts the inductance value of the adjustable inductor to enable the main path power factor of the secondary end 12 to tend to 1.

When a user uses electricity, a lot of reactive power is often generated, the reactive power comes from some inductive loads on the electricity utilization equipment, a common motor such as a motor has a large inductive load, the working principle of the motor is to use the action of a magnetic field to do work, so many inductive loads cannot be avoided, the inductive loads do not consume power, the reactive power and the active power consumed by resistance type are added in a vector manner and then are transmitted on a power grid as apparent power, although a user end only consumes the active power, but the reactive power exists to enable a part of the total power of the power grid to be occupied, so that the reactive power cannot be used in other electricity utilization places, when the reactive current flows on the circuit, the circuit has a tiny resistor to generate heat, so that a small amount of energy loss can be generated, when the reactive current is large, the loss is also large, and a parameter of a power factor exists when the proportion of the reactive power and the active power is evaluated, the power factor is equal to the ratio of the active power to the apparent power, when the power factor is close to 1, that is, it indicates that the reactive power is cancelled, the inductive load cannot avoid but can cancel, in the prior art, the power factor is generally performed by connecting capacitors in parallel, the phase angle of the inductive current lags behind the phase angle of the resistive current by 90 degrees, while the capacitive current leads by 90 degrees, and by connecting equivalent capacitive loads in parallel at the inductive load, only the resistive current exists in the current main circuit, and the power factor becomes 1. The invention obtains the power factor on the main circuit through the reactive phase angle detection module, when the power factor changes because of the load change of the user terminal 200, the adjustable inductance 6 is adjusted to match with the load, so that the power factor of the main circuit becomes 1 again, according to the above, most of the user terminal 200 except the resistive load has complicated inductance, but the invention connects the excess capacitance on the secondary terminal 12 in parallel in advance to become capacitive current, then the capacitance exceeding the capacitance module 5 is offset by adjusting the inductance of the adjustable inductance 6, because the capacitance of the capacitance module 5 is inconvenient to be adjusted continuously, the inductance is selected as the object of continuous adjustment, so that the total power factor on the circuit can be very close to 1.

As shown in fig. 3, the adjustable inductor 6 includes an iron core 61, an ac coil 62, an excitation coil 63, and a dc loop 64, the ac coil 62 and the excitation coil 63 are respectively sleeved on the iron core 61, two ends of the ac coil 62 are connected in parallel to the secondary end 12, the excitation coil 63 is used as a part of the dc loop 64, the dc loop 64 changes the current magnitude in the excitation coil 63 by changing the power supply voltage or changing the resistance value on the circuit, and the dc loop 64 receives the adjustment signal transmitted by the reactive phase angle detection module.

The continuous change of the inductance value of the adjustable inductor 6 is realized by changing the exciting current, the alternating current coil 62 is connected in parallel to the secondary end 12 power grid as an inductive load, the saturation degree of the magnetic lines of force emitted from the iron core 61 arranged in the center of the alternating current coil 62 can influence the inductance value of the alternating current coil 62, the saturation degree of the magnetic lines of force of the iron core 61 is changed by the exciting coil 63, direct current is introduced into the exciting coil 63, and the direct current can conveniently change the current by changing the voltage or the resistance on the circuit. In the operation process: the dc circuit 64 obtains a signal from the reactive phase angle detection module, changes the magnitude of its own current, affects the magnetism of the iron core 61, changes the inductance value of the ac coil 62 to match with other loads on the secondary side 12, and changes the power factor on the secondary side 12 to 1, thereby obtaining necessary power only from the utility side 100, completely eliminating unnecessary reactive power, and maximizing the effect of power factor local compensation.

As shown in fig. 2 and 4, the reactive phase angle detection module includes a voltage transformer 3, a current transformer 4, a first operational amplifier Y1, a second operational amplifier Y2, a transistor S, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, wherein a base of the transistor S is connected to an output end of the second operational amplifier Y2, a collector of the transistor S is connected to a positive input end of the first operational amplifier Y1, an emitter of the transistor S is grounded, one end of the fifth resistor R5 is connected to an output end of the second operational amplifier Y2, and one end of the fifth resistor R5 is grounded, a positive input end of the second operational amplifier Y2 is grounded, a negative input end of the first operational amplifier Y1 is connected to the first resistor R1, a positive input end of the first operational amplifier Y1 is connected to the second resistor R2, the other ends of the first resistor R1 and the second resistor R2 are connected to form a common end, a negative input end of the first operational amplifier Y1 is further connected to a negative output end of the third resistor R5 through the fourth operational amplifier Y57324, the voltage transformer 3 is connected in parallel to the secondary end 12 to obtain a voltage signal u0 of a main circuit on the user terminal 200, the signal u0 is loaded to the negative input end of the second operational amplifier Y2, the current transformer 4 is arranged on the live wire of the secondary end 12 to obtain a total current signal ux of the main circuit on the user terminal 200, the signal ux is loaded to the common end of the first resistor R1 and the second resistor R2, and a measurement signal uf output by the output end of the first operational amplifier Y1 is transmitted to the adjustable inductor 6.

When the compensation is not considered, in fig. 2, the voltage u0 at the secondary end 12 is used as an original driving voltage, a current fluctuation curve thereof is used as a reference line, as shown in fig. 5, the alternating current is changed in a sine manner, the total path current detected by the current transformer 4 is the current superposition of a plurality of loads, the current is converted into an equal proportion level signal through a resistor after being acquired by the current transformer 4, a basic change curve thereof is also a sine curve, as shown in fig. 5, ux, the degree lagging behind u0 in phase is an angle theta, cosine of theta is a power factor in the circuit, u0 and ux respectively enter a processor of the reactive phase angle detection module, u0 is loaded on the second operational amplifier Y2 as a reference signal, as shown in the connection of fig. 4, the second operational amplifier Y2 is an inverse amplifier, u0 is at a high level, the output end of the second operational amplifier Y2 is at a low level, and the triode S is cut off, the negative input end of the first operational amplifier Y1 is grounded through R4, the first operational amplifier Y1 is used as a positive amplifier, uf and ux have the same direction, when u0 is low level, the output end of the second operational amplifier Y2 is high level, the triode S is conducted, the positive input end of the first operational amplifier Y1 is preferentially grounded, the first operational amplifier Y1 is used as a reverse amplifier, uf and ux are reversed, and a representative wave diagram of u0, ux and uf,

in the specific values: and setting the effective level of Ux as Ux, then:

wherein:

and (3) spreading and sorting the uf Fourier decomposition to obtain:

And a number of alternating current variations, the average of which

The power factor is included in the secondary end 12, so that the power factor on the main line can be measured by using uf, and after the power factor is obtained, the adjustable inductor 6 is adjusted to make the power factor cos theta be 1 again.

As shown in fig. 1, the movable vehicle 9 further includes a heat dissipation fan 94, ventilation openings are provided at upper portions of the low pressure chamber 91 and the high pressure chamber 93, and the heat dissipation fan 94 is installed at the ventilation opening of one of the low pressure chamber 91 and the high pressure chamber 93 and blows air outward. The heat dissipation fan 94 and vents provide heat dissipation to the internal electrical components.

A rain cover 95 is arranged outside the ventilation openings at the upper parts of the low-pressure chamber 91 and the high-pressure chamber 93. The rain cover 95 prevents rainwater from entering the compartment.

The low pressure chamber 91 is close to the cab of the vehicle 9, and the high pressure chamber 93 is far from the cab of the vehicle 9. The high pressure chamber 93 has a relatively large weight with respect to the low pressure chamber 91, requires a higher heat dissipation requirement, is more dangerous, and is far away from the cab to prevent unnecessary electromagnetic interference with the cab.

The capacitor module 5 is detachable, and a plurality of capacitor modules 5 with different capacities are stored in the mobile vehicle 9. The capacitance module 5 should have a capacity larger than the inductive load of the user terminal 200 and leave a small range of adjustment margin to become the adjustment range of the adjustable inductor 6, if the capacitance module 5 exceeds the user terminal 200, the adjustment range of the adjustable inductor 6 may be insufficient, and if the capacitance module 5 is too small, the capacitive load cannot be perfectly provided, so that the power factor on the main circuit cannot reach 1, and therefore, the capacitance modules 5 with various specifications are configured for capacity replacement and combination.

The upper part of the carriage of the moving vehicle 9 is provided with a lightning rod, and the bottom of the moving vehicle 9 is provided with a telescopic grounding column. The ground of the device may be directly the ground of the commercial power terminal 100, but the ground may be further grounded on the outside of the vehicle 9, so that the earth leakage protection and the like can be performed more securely.

The invention has the following brief using process: an external primary power supply or a power grid is connected to a commercial power end 100, a load on a user side is connected to a user end 200, a voltage transformer 3 and a current transformer 4 obtain the magnitude and the phase of voltage and current on a secondary end 12, the magnitude and the phase of the voltage and the current are processed by a reactive phase angle detection module to form a control signal uf, the uf is transmitted to an adjustable inductor 6, a power factor is extracted from a direct current component in the uf, the inductance of the adjustable inductor 6 is adjusted, the power factor returns to 1 again, and the power taken from the commercial power end 100 has no reactive power all the time.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A mobile substation connects utility terminals (100) and user terminals (200), characterized in that: the movable transformer substation comprises a movable trolley (9) and a transformer (1), wherein a carriage of the movable trolley (9) is divided into a low-voltage chamber (91), a power transformation chamber (92) and a high-voltage chamber (93), the transformer (1) is arranged in the power transformation chamber (92), a commercial power end (100) is arranged in the high-voltage chamber (93), a user end (200) is arranged in the low-voltage chamber (91), the transformer (1) comprises a primary end (11) and a secondary end (12), the primary end (11) is connected with the commercial power end (100), and the secondary end (12) is connected with the user end (200);

the mobile substation also comprises a reactive phase angle detection module and a reactive compensation module, wherein the reactive compensation module comprises a capacitor module (5) and an adjustable inductor (6), the capacitor module (5) and the adjustable inductor (6) are respectively connected on the secondary end (12) in parallel, the reactive phase angle detection module is installed on the main path of the secondary end (12), the reactive phase angle detection module detects the power factor value of the main path and transmits a signal to the adjustable inductor (6), and the adjustable inductor (6) adjusts the inductance value thereof to enable the power factor of the main path of the secondary end (12) to tend to 1;

the reactive phase angle detection module comprises a voltage transformer (3), a current transformer (4), a first operational amplifier Y1, a second operational amplifier Y2, a triode S, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein the base electrode of the triode S is connected with the output end of the second operational amplifier Y2, the collector electrode of the triode S is connected with the positive input end of the first operational amplifier Y1, the emitter electrode of the triode S is grounded, one end of the fifth resistor R5 is connected with the output end of the second operational amplifier Y2, one end of the fifth resistor R5 is grounded, the positive input end of the second operational amplifier Y2 is grounded, the negative input end of the first operational amplifier Y1 is connected with the first resistor R1, the positive input end of the first operational amplifier Y1 is connected with the second resistor R2, the other ends of the first resistor R1 and the second resistor R2 are connected to form a common end, and the negative input end of the first operational amplifier Y1 is further connected with the output end of the third, the negative input end of the first operational amplifier Y1 is grounded through a fourth resistor R4, the voltage transformer (3) is connected in parallel to the secondary end (12) to obtain a voltage signal u0 of a main circuit on a user terminal (200), the signal u0 is loaded to the negative input end of the second operational amplifier Y2, the current transformer (4) is arranged on a live wire of the secondary end (12) to obtain a total current signal ux of the main circuit on the user terminal (200), the signal ux is loaded to a common end of the first resistor R1 and the second resistor R2, and a measurement signal uf output by the output end of the first operational amplifier Y1 is transmitted to the adjustable inductor (6);

the adjustable inductor (6) comprises an iron core (61), an alternating current coil (62), an excitation coil (63) and a direct current loop (64), the alternating current coil (62) and the excitation coil (63) are respectively sleeved on the iron core (61), two ends of the alternating current coil (62) are connected with a secondary end (12) in parallel, the excitation coil (63) is used as a part of the direct current loop (64), the direct current loop (64) changes the current in the excitation coil (63) through changing the power supply voltage or changing the resistance value on the circuit, and the direct current loop (64) receives an adjusting signal transmitted by the reactive phase angle detection module;

the moving vehicle (9) further comprises a heat dissipation fan (94), ventilation openings are formed in the upper portions of the low-pressure chamber (91) and the high-pressure chamber (93), and the heat dissipation fan (94) is installed on the ventilation opening of one of the low-pressure chamber (91) and the high-pressure chamber (93) and blows air outwards.

2. A mobile substation according to claim 1, characterized in that: rain-proof covers (95) are arranged outside the ventilation openings at the upper parts of the low-pressure chamber (91) and the high-pressure chamber (93).