CN211880102U - Multifunctional four-quadrant converter - Google Patents

Multifunctional four-quadrant converter Download PDF

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Publication number
CN211880102U
CN211880102U CN202020290339.0U CN202020290339U CN211880102U CN 211880102 U CN211880102 U CN 211880102U CN 202020290339 U CN202020290339 U CN 202020290339U CN 211880102 U CN211880102 U CN 211880102U
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main
series
loop
alternating current
static switch
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李永臣
彭婷婷
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Qingdao Ldc Technology Co ltd
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Qingdao Ldc Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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Abstract

The utility model discloses a multi-functional four-quadrant deflector. The method comprises the following steps: the system comprises a controller, a main converter, an inversion static switch, a series static switch and an alternating current contactor; the main converter is an AC/DC bidirectional converter, the DC side is connected with the energy storage battery, the AC side is connected with a first connecting point of the main AC loop through an inversion static switch, the AC side is also connected with the primary side of the compensation transformer through a series static switch, and the secondary side of the compensation transformer is connected in series in the main AC loop; the secondary side of the compensation transformer and the first connecting point are both positioned between the input end of the main loop and the output end of the main loop; the controller is in control connection with the main converter, the inversion static switch, the series static switch and the alternating current contactor; and the alternating current contactor is connected in the main alternating current loop between the input end of the main loop and a first line in series, and the first line is a line between the secondary side of the compensation transformer and the first connecting point.

Description

Multifunctional four-quadrant converter
Technical Field
The utility model relates to a power transmission and distribution system optimization technique, advanced equipment make and automatic technical field, especially relate to a multi-functional four-quadrant deflector.
Background
In the early development stage of a power system, indexes for measuring the quality of electric energy are simple, the indexes mainly comprise frequency deviation and voltage deviation, and since the 20 th century and the 80 th century, nonlinear power electronic devices and devices are widely applied to modern industry along with the development of power electronic technology, and the operation of the devices causes the waveform distortion of voltage and current in a power grid to be more and more serious, and the harmonic level to continuously rise. Further, when an impact or fluctuating load such as an arc furnace, a large rolling mill, an electric locomotive, etc. is operated, not only a large amount of harmonics but also power quality problems such as voltage fluctuation, flicker, three-phase imbalance, etc. are generated. With the continuous popularization of various complex, precise and power quality-sensitive electric equipment and the increasing requirements of people on power quality, the power quality becomes a hotspot of the current demand.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-functional four-quadrant deflector.
In order to achieve the above object, the utility model provides a following scheme:
a multi-functional four-quadrant deflector, comprising: the system comprises a controller, a main converter, an inversion static switch, a series static switch and an alternating current contactor;
the main converter is an AC/DC bidirectional converter, the DC side is connected with an energy storage battery, the AC side is connected with a first connecting point of a main AC loop through the inversion static switch, the AC side is also connected with the primary side of a compensation transformer through the series static switch, and the secondary side of the compensation transformer is connected in series in the main AC loop; the main alternating current loop comprises a main loop input end and a main loop output end, and the secondary side of the compensation transformer and the first connecting point are both positioned between the main loop input end and the main loop output end;
the controller is in control connection with the main converter, the inversion static switch, the series static switch and the alternating current contactor;
the alternating current contactor is connected in series in a main alternating current loop between the input end of the main loop and a first line, and the first line is a line between the secondary side of the compensation transformer and the first connecting point;
when the multifunctional four-quadrant converter device works in a rectification mode, the series static switch is disconnected, the inversion static switch and the alternating current contactor are closed, and the controller controls the main converter to work in the rectification mode; when the multifunctional four-quadrant converter device works in an inversion mode, the series static switch and the alternating current contactor are disconnected, the inversion static switch is closed, and the controller controls the main converter to work in the inversion mode; when the multifunctional four-quadrant converter device works in a series compensation mode, the inversion static switch is switched off, the series static switch and the alternating current contactor are switched on, and the controller controls the main converter to work in a power tracking compensation mode.
Optionally, the multi-functional four-quadrant variable flow device further includes: the first filter is connected in series in a main alternating current loop between the input end of the main loop and the alternating current contactor, and the second filter is connected in series in the main alternating current loop between the first line and the output end of the main loop.
Optionally, the multi-functional four-quadrant variable flow device further includes: a third filter through which an AC side of the main converter is connected with the inverting static switch and the series static switch.
Optionally, the multi-functional four-quadrant variable flow device further includes:
one end of the bypass static switch is connected with a second connection point on the main alternating current loop, and the other end of the bypass static switch is connected with a third connection point on the main alternating current loop; the second connection point is located between the first filter and the ac contactor, and the third connection point is located between the first line and the second filter;
when the multifunctional four-quadrant converter device works in a bypass mode, the controller controls the bypass static switch to be closed and controls the alternating current contactor to be disconnected.
Optionally, the multi-functional four-quadrant variable flow device further includes:
and the main circuit input air switch is connected between the input end of the main circuit and the first filter in series.
Optionally, the multi-functional four-quadrant variable flow device further includes:
a bypass input air switch, one end of which is connected to a fourth connection point of the main AC circuit and the other end of which is connected to a fifth connection point of the main AC circuit; the fourth connection point is located between the main loop input and the main loop input air switch, and the fifth connection point is located between the second filter and the main loop output;
when the multifunctional four-quadrant converter device works in an overhauling mode, the bypass input air switch is closed, and the main path input air switch is disconnected.
Optionally, the multi-functional four-quadrant variable flow device further includes:
a main path output air switch connected in series between the second filter and the fifth connection point.
Optionally, the multi-functional four-quadrant variable flow device further includes: and the direct current side of the main converter is connected with the energy storage battery through the direct current input switch.
Optionally, the multi-functional four-quadrant variable flow device further includes: and the fourth filter is connected between the direct current side of the main converter and the direct current input switch in series.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect: the utility model provides a multi-functional four-quadrant deflector includes controller, main converter, contravariant static switch, series connection static switch and ac contactor. When the series static switch is disconnected, the inversion static switch and the alternating current contactor are closed, and the main converter is controlled to work in a rectification mode, the multifunctional four-quadrant converter device works in the rectification mode; when the series static switch and the alternating current contactor are disconnected, the inversion static switch is closed, and the main converter is controlled to work in an inversion mode, the multifunctional four-quadrant converter device works in the inversion mode; when the inversion static switch is switched off, the series static switch and the alternating current contactor are switched on, and the main converter is controlled to work in a power tracking compensation mode, the multifunctional four-quadrant converter device works in a series compensation mode. It can be seen that the utility model provides a deflector can work under multiple mode, has multiple functions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a multi-functional four-quadrant converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the rectification mode energy flow in the embodiment of the present invention;
fig. 3 is a schematic diagram of the inversion mode energy flow in the embodiment of the present invention;
fig. 4 is a schematic diagram of energy flow in series compensation mode according to an embodiment of the present invention;
fig. 5 is a voltage waveform diagram of the battery when the converter device is switched to the inverter mode according to the embodiment of the present invention;
fig. 6 is a voltage waveform diagram of an output terminal when the converter device is switched to the inversion mode according to the embodiment of the present invention;
fig. 7 is an expanded view of the voltage waveform of the output terminal when the converter device is switched to the inversion mode according to the embodiment of the present invention;
fig. 8 is a current waveform diagram of a load when the converter device is switched to the inversion mode according to the embodiment of the present invention;
fig. 9 is a current waveform diagram of the load at the switching point when the converter device switches to the inversion mode according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The utility model provides a multi-functional four-quadrant deflector, as shown in figure 1, the device includes: the controller, a main converter 14, an inversion static switch 12, a series static switch 11 and an alternating current contactor 5;
the main converter 14 is an AC/DC bidirectional converter, the DC side of which is connected to the energy storage battery, the AC side of which is connected to the first connection point of the main AC circuit through the inverting static switch 12, the AC side of which is connected to the primary side of the compensation transformer 6 through the series static switch 11, and the secondary side of the compensation transformer 6 is connected in series to the main AC circuit; the main alternating current loop comprises a main loop input end 1 and a main loop output end 10, and the secondary side of the compensating transformer 6 and the first connecting point are both positioned between the main loop input end 1 and the main loop output end 10;
the controller is in control connection with the main converter 14, the inverting static switch 12, the series static switch 11 and the alternating current contactor 5;
the ac contactor 5 is connected in series in the main ac loop between the main loop input terminal 1 and a first line, where the first line is a line between the secondary side of the compensation transformer 6 and the first connection point;
when the multifunctional four-quadrant converter device works in a rectification mode, the series static switch 11 is opened, the inversion static switch 12 and the alternating current contactor 5 are closed, and a controller preferably controls the main converter 14 by using a high-frequency rectification control strategy based on hysteresis current; when the multifunctional four-quadrant converter device works in an inversion mode, the series static switch 11 and the alternating current contactor 5 are disconnected, the inversion static switch 12 is closed, and a controller preferably controls the main converter 14 by using a space voltage vector control strategy; when the multifunctional four-quadrant converter device works in a series compensation mode, the inversion static switch 12 is opened, the series static switch 11 and the alternating current contactor 5 are closed, and the controller preferably controls the main converter 14 by using a hysteresis current-based high-frequency rectification control strategy, a voltage-based direct instantaneous power control strategy and a three-phase reactive current-based space voltage vector control strategy.
In an embodiment, the main converter 14 may be composed of a three-phase half-bridge converter in a three-level configuration, and may operate in a rectifying/inverting mode. The alternating current contactor 5 has the functions of loop automatic switch control, electrical isolation and overcurrent protection. When the converter works in a rectification mode, the lower half arm IGBT, the freewheeling diode and the alternating current inductor of each IGBT bridge arm of the converter jointly form a typical rectification + BOOST circuit to realize the basic function of high-frequency AC/DC, at the moment, the controller converts a three-phase alternating current power supply of a power grid into a direct current power supply with controllable voltage and current by using a high-frequency rectification control strategy based on hysteresis current to charge an energy storage battery, and simultaneously realizes a PFC (power factor correction) function on a grid side, so that the input current on the grid side achieves the effects of low harmonic wave and high power factor, and the energy flows as shown in figure 2 when the input current on the grid side stably supplies power to an alternating current load. When the vehicle runs in an inversion mode, the main converter 14 forms a typical three-phase inverter circuit to realize the basic functions of SVPWM-based DC/AC, the controller uses a space voltage vector control strategy, the energy storage battery inverts the DC electric energy into a frequency-stabilizing and voltage-stabilizing AC power supply through the main converter 14 to uninterruptedly supply power to the AC load so as to ensure the normal work of the AC load, and the energy flow is as shown in figure 3. When the power supply works in a series compensation mode, the main converter 14 forms a typical four-quadrant converter circuit, at this time, the controller controls the main converter 14 by using a high-frequency rectification control strategy based on hysteresis current, a direct instantaneous power control strategy based on voltage and an SVPWM strategy based on three-phase reactive current, three strategies use three redundant PI regulation to realize smooth seamless switching, the main converter 14 performs reactive compensation, harmonic compensation and three-phase load unbalance compensation on the electric energy quality of the power supply inlet side to improve the electric energy quality of the power supply inlet side, and the energy flow is as shown in figure 4.
It should be emphasized that the present invention is directed to a circuit structure of a multi-functional four-quadrant converter, which can operate in multiple modes and have multiple functions due to the arrangement of the circuit structure. As regards the control strategies in the controller, this is not the protection of the present invention and these control strategies are common knowledge in the art.
In the embodiment, as a preferred implementation mode, when the power grid incoming line side has electricity and the relevant parameters of power supply are normal, the utility model provides a converter works in the rectification mode, charges for storage battery, realizes the battery management function. When the power supply of electric wire netting incoming line side is interrupted, the utility model provides a converter work is in the contravariant mode, for the load power supply, realizes uninterrupted power supply, anti-electricity-dazzling function. The electric wire netting inlet wire side has the electricity, but when the relevant parameter of power supply is not good, the utility model provides a converter work when series compensation mode, realizes APF and SVG's basic function. The quality of the output electric energy is improved.
As a preferred embodiment, when the energy storage battery is not maintained for a long time, even the relevant parameter of electric wire netting power supply is not good, the utility model provides a converter still needs to switch to the rectification mode in good time and realizes battery management maintenance function, generally selects the night time period to accomplish.
In an embodiment, the converter device provided by the present invention may further include: the filter circuit comprises a first filter 4, a second filter 8 and a third filter 13, wherein the first filter 4 is connected between the main loop input end 1 and the alternating current contactor 5 in series, and the second filter 8 is connected between the first line and the main loop output end 10 in series. The ac side of the main converter 14 is connected to the inverting static switch 12 and the series static switch 11 through the third filter 13. The filter has the functions of low-pass filtering and energy storage.
In an embodiment, the converter device provided by the present invention may further include: a bypass static switch 7, one end of which is connected with a second connection point on the main alternating current loop and the other end of which is connected with a third connection point on the main alternating current loop; the second connection point is located between the first filter 4 and the ac contactor 5, and the third connection point is located between the first line and the second filter 8. In this case, when the bypass static switch 7 is closed and the ac contactor 5 is open, the converter device provided by the present invention can operate in the bypass mode. When the main converter 14 fails or the converter device cannot work in the inversion mode, the rectification mode or the series compensation mode, the converter device can be controlled to work in the bypass mode, so that uninterrupted power supply is realized.
In an embodiment, the multi-functional four-quadrant deflector may further comprise: a main input air switch 3 and a bypass input air switch 2; a main circuit input air switch 3 is connected in series between the main circuit input 1 and the first filter 4; a bypass input air switch 2, one end of which is connected to the fourth connection point of the main ac circuit and the other end of which is connected to the fifth connection point of the main ac circuit; the fourth connection point is located between the main circuit input 1 and the main circuit input air switch 3, and the fifth connection point is located between the second filter 8 and the main circuit output 10. Under this condition, when bypass input air switch 2 is closed, just when main road input air switch 3 breaks off, the utility model provides a converter work is in maintenance mode, under this kind of mode, can overhaul the components and parts in main converter 14 and each return circuit to incessant power supply has been realized.
In an embodiment, the converter device provided by the present invention may further include: a main path output air switch 9 connected in series between the second filter 8 and the fifth connection point.
In an embodiment, the converter device provided by the present invention may further include: a dc input switch 16, through which the dc side of the main converter 14 is connected to the energy storage battery 16.
In an embodiment, the converter device provided by the present invention may further include: and a fourth filter 15 connected in series between the dc side of the main converter 14 and the dc input switch 16.
In the embodiment, the air switch has the functions of loop manual switch control, electrical isolation and overcurrent protection, and the static switch has the functions of quick on-off control and working logic control.
Fig. 5 to fig. 9 are diagrams illustrating the power supply effect when the converter device of the present invention is switched to the inversion mode in case of a power grid fault, and during the switching process, as can be seen from fig. 5, the voltage fluctuation of the battery is very small. It can be seen from fig. 6 that the output voltage is not interrupted at the switching moment. It can be seen from fig. 7 that the fluctuation of the output voltage waveform at the time of switching is very small. As can be seen from fig. 8 and 9, the current of the load is not interrupted and the fluctuation is small at the time of switching.
The utility model discloses can realize the seamless switching between multiple control mode, have concentrate the power supply, maintain advantages such as convenient, economic feasible, reliable and stable, have multiple functions selectable concurrently, a tractor serves several purposes, reduction investment and equipment running cost by a wide margin.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (9)

1. A multi-functional four-quadrant deflector, comprising: the system comprises a controller, a main converter, an inversion static switch, a series static switch and an alternating current contactor;
the main converter is an AC/DC bidirectional converter, the DC side is connected with an energy storage battery, the AC side is connected with a first connecting point of a main AC loop through the inversion static switch, the AC side is also connected with the primary side of a compensation transformer through the series static switch, and the secondary side of the compensation transformer is connected in series in the main AC loop; the main alternating current loop comprises a main loop input end and a main loop output end, and the secondary side of the compensation transformer and the first connecting point are both positioned between the main loop input end and the main loop output end;
the controller is in control connection with the main converter, the inversion static switch, the series static switch and the alternating current contactor;
the alternating current contactor is connected in series in a main alternating current loop between the input end of the main loop and a first line, and the first line is a line between the secondary side of the compensation transformer and the first connecting point;
when the multifunctional four-quadrant converter device works in a rectification mode, the series static switch is disconnected, the inversion static switch and the alternating current contactor are closed, and the controller controls the main converter to work in the rectification mode; when the multifunctional four-quadrant converter device works in an inversion mode, the series static switch and the alternating current contactor are disconnected, the inversion static switch is closed, and the controller controls the main converter to work in the inversion mode; when the multifunctional four-quadrant converter device works in a series compensation mode, the inversion static switch is switched off, the series static switch and the alternating current contactor are switched on, and the controller controls the main converter to work in a power tracking compensation mode.
2. A multi-functional four-quadrant deflector according to claim 1, further comprising: the first filter is connected in series in a main alternating current loop between the input end of the main loop and the alternating current contactor, and the second filter is connected in series in the main alternating current loop between the first line and the output end of the main loop.
3. A multi-functional four-quadrant deflector according to claim 1, further comprising: a third filter through which an AC side of the main converter is connected with the inverting static switch and the series static switch.
4. A multi-functional four-quadrant deflector according to claim 2, further comprising:
one end of the bypass static switch is connected with a second connection point on the main alternating current loop, and the other end of the bypass static switch is connected with a third connection point on the main alternating current loop; the second connection point is located between the first filter and the ac contactor, and the third connection point is located between the first line and the second filter;
when the multifunctional four-quadrant converter device works in a bypass mode, the controller controls the bypass static switch to be closed and controls the alternating current contactor to be disconnected.
5. A multi-functional four-quadrant deflector according to claim 2, further comprising:
and the main circuit input air switch is connected between the input end of the main circuit and the first filter in series.
6. A multi-functional four-quadrant deflector according to claim 5, further comprising:
a bypass input air switch, one end of which is connected to a fourth connection point of the main AC circuit and the other end of which is connected to a fifth connection point of the main AC circuit; the fourth connection point is located between the main loop input and the main loop input air switch, and the fifth connection point is located between the second filter and the main loop output;
when the multifunctional four-quadrant converter device works in an overhauling mode, the bypass input air switch is closed, and the main path input air switch is disconnected.
7. A multi-functional four-quadrant deflector according to claim 6, further comprising:
a main path output air switch connected in series between the second filter and the fifth connection point.
8. A multi-functional four-quadrant deflector according to claim 1, further comprising: and the direct current side of the main converter is connected with the energy storage battery through the direct current input switch.
9. A multi-functional four-quadrant deflector according to claim 8, further comprising: and the fourth filter is connected between the direct current side of the main converter and the direct current input switch in series.
CN202020290339.0U 2020-03-11 2020-03-11 Multifunctional four-quadrant converter Active CN211880102U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113394781A (en) * 2020-03-11 2021-09-14 青岛艾迪森科技股份有限公司 Multifunctional four-quadrant converter
EP4333255A1 (en) * 2022-08-11 2024-03-06 Milwaukee Electric Tool Corporation Portable power supply with bidirectional charging and passthrough

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113394781A (en) * 2020-03-11 2021-09-14 青岛艾迪森科技股份有限公司 Multifunctional four-quadrant converter
EP4333255A1 (en) * 2022-08-11 2024-03-06 Milwaukee Electric Tool Corporation Portable power supply with bidirectional charging and passthrough

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