WO2024051869A1

WO2024051869A1 - Three-phase voltage impedance adjustable transformer and control method and control apparatus therefor, computer device, storage medium and computer program product

Info

Publication number: WO2024051869A1
Application number: PCT/CN2023/130509
Authority: WO
Inventors: 慕小斌; 陈国富; 王翔; 赵国亮; 袁佩娥; 谷伟明; 原亚雷; 戴凤娇; 李宏浩; 丁长新; 刘壮壮
Original assignee: 国网智能电网研究院有限公司
Priority date: 2022-09-08
Filing date: 2023-11-08
Publication date: 2024-03-14
Also published as: CN115173427B; CN115173427A

Abstract

Provided in the embodiments of the present disclosure are a three-phase voltage impedance adjustable transformer and a control method and control apparatus therefor, a computer device, a storage medium and a computer program product. The three-phase voltage impedance adjustable transformer comprises: a three-phase parallel transformer and a three-phase series transformer, wherein the three-phase parallel transformer is connected in parallel to power transmission lines of corresponding phases; and a primary side of each phase of the three-phase series transformer is connected in series to a power transmission line of a corresponding phase, and a secondary side of each phase in the three-phase series transformer is connected to a voltage adjustment apparatus in the three-phase parallel transformer. By means of the design, when the capacity required by the voltage impedance adjustment of a three-phase line is certain, the design capacity of an adjustable apparatus can be greatly reduced, thereby facilitating the compact design of the apparatus and reducing the manufacturing cost. Moreover, by means of the impedance adjustment design, the fault and damage probabilities of the three-phase voltage impedance adjustable transformer are reduced.

Description

A three-phase voltage-impedance adjustable transformer and control method, control device, computer equipment, storage medium, and computer program product

Cross-references to related applications

This disclosure is based on a Chinese patent application with the application number 202211092909.5, the filing date being September 8, 2022, and the invention title being "A three-phase voltage impedance adjustable transformer and a control method", and claims the priority of this Chinese patent application , the entire content of this Chinese patent application is hereby incorporated by reference into this disclosure.

Technical field

The present disclosure relates to the technical field of AC voltage regulation of power systems, and in particular to a three-phase voltage-impedance adjustable transformer and a control method, control device, computer equipment, storage medium, and computer program product.

Background technique

A large number of new energy power generation and new loads (such as electric vehicles, etc.) are connected to the distribution network. The randomness, intermittent and volatility of power generation and consumption can directly lead to large voltage fluctuations in the distribution network and reverse flow overload. , difficulty in loop closing operation, etc. At the same time, the distribution network will face problems such as difficulty in capacity increase and low equipment utilization, which will affect the friendly interaction of all links of "source-grid-load-storage".

In order to deal with the above problems, it is urgent to improve the flexible adjustment capability of the power grid, and one of its core technologies is how to flexibly adjust the amplitude and phase of the voltage of the power grid lines, and even the impedance, so as to achieve flexible interconnection between the power grid lines. . However, the flexible interconnection technology solutions in related technologies mainly adopt "back-to-back" power electronic technology solutions, such as power electronic transformers, energy routers, soft switches (Soft Open Point, SOP), flexible multi-state switches, etc. These technologies form Voltage impedance adjustment devices have a series of problems such as high cost, large area, large losses, low reliability, and difficult maintenance.

Contents of the invention

Based on the above technical problems, embodiments of the present disclosure provide a three-phase voltage-impedance adjustable transformer, a control method, a control device, a computer device, a storage medium, and a computer program product.

The embodiments of this disclosure provide the following technical solutions:

In a first aspect, an embodiment of the present disclosure provides a three-phase voltage-impedance adjustable transformer, including: a three-phase parallel transformer and a three-phase series transformer, wherein,

The three-phase parallel transformers are connected in parallel to the corresponding phase transmission lines;

Each phase primary side of the three-phase series transformer is connected in series to the corresponding phase transmission line. The secondary side of each phase in the transformer is connected to the voltage regulating device in the three-phase parallel transformer;

By controlling the working state of the voltage regulating device in the three-phase parallel transformer, the three-phase input voltage is vector transformed and synthesized, and the resulting synthesized voltage is superimposed on the three-phase series transformer. The impedance is adjusted by the impedance adjusting mechanism on the secondary side of the three-phase series transformer and then transmitted to the transmission line.

Optionally, each phase secondary side of the three-phase series transformer includes: a secondary winding, an inductor, a first switch, a second switch and a capacitor, where,

One end of the secondary winding of each phase of the three-phase series transformer is respectively connected to the secondary side voltage regulating device of the next adjacent phase of the three-phase parallel transformer and one end of the first switch. The other end of the phase secondary winding is connected to one end of the inductor and one end of the second switch respectively, and one end of the capacitor is connected to the other end of the first switch and the other end of the inductor respectively. The other end of the capacitor is connected to the other end of the second switch to form the output end of the secondary side of the three-phase series transformer.

Optionally, each phase of the three-phase parallel transformer includes: a primary winding, a secondary winding, multiple voltage regulating devices and multiple uninterruptible power shifting devices, wherein,

The first end of the primary winding of each phase is respectively connected to the current transmission line and the end of the primary winding of the next adjacent phase of the three-phase parallel transformer;

Each phase secondary winding of the three-phase parallel transformer includes multiple asymmetric windings. Each asymmetric winding has multiple taps. Each asymmetric winding is connected to one of the voltage regulators after passing through the uninterruptible power shifting device. device.

The first end of the primary winding of each phase is connected to the transmission line of the current phase, and the end of the primary winding of each phase is grounded;

Multiple taps are drawn from the end of the primary winding of each phase of the three-phase parallel transformer to form an asymmetric winding, and the asymmetric winding is connected to one of the voltage regulating devices after passing through the uninterruptible power shifting device;

Optionally, one end of the secondary winding in the secondary side of each phase of the three-phase series transformer is sequentially connected to the secondary side voltage regulating device of the two adjacent phases of the three-phase parallel transformer and the original phase of the three-phase parallel transformer. The secondary side voltage regulating device is connected;

One end of the secondary winding in each secondary phase of the three-phase series transformer is also connected to the secondary output end of the next adjacent phase of the three-phase series transformer.

Optionally, one end of the secondary winding in the secondary side of each phase of the three-phase series transformer is sequentially connected to the secondary side voltage regulating device of the two adjacent phases of the three-phase parallel transformer and the original phase of the three-phase parallel transformer. The primary side voltage regulating device is connected to the secondary output end of the current phase of the three-phase series transformer.

Optionally, the voltage regulating device is a switch arm module, and the switch arm module adopts a bridge structure. structure.

Optionally, the uninterruptible power shifting device includes: a first current limiting circuit and a second current limiting circuit, wherein,

The first current limiting circuit is connected between the first tap of the asymmetric winding and the first bridge arm of the switch bridge arm module;

The second tap of the asymmetric winding is connected to the second bridge arm of the switch bridge arm module;

The second current limiting circuit is connected between the third tap of the asymmetric winding and the third bridge arm of the switch arm module.

Optionally, the first current limiting circuit includes: a first current limiting branch and a first current limiting switch, wherein the first current limiting branch is connected in parallel with the first current limiting switch, and the first current limiting branch is connected in parallel with the first current limiting switch. a current-limiting branch, including a first resistor or a first inductor;

The second current limiting circuit includes: a second current limiting branch and a second current limiting switch, wherein the second current limiting branch is connected in parallel with the second current limiting switch, and the second current limiting branch path, including a second resistor or a second inductor;

Before shifting gears, first turn off the first current-limiting switch or the second current-limiting switch, put in the first current-limiting branch or the second current-limiting branch, and then switch gears. , close the first current-limiting switch or the second current-limiting switch.

In a second aspect, embodiments of the present disclosure provide a three-phase voltage impedance adjustable transformer control method based on the three-phase voltage impedance adjustable transformer described in the first aspect of the disclosure embodiment. The three-phase voltage impedance adjustable transformer control method methods, including:

Control the working state of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage;

The obtained synthetic voltage is superimposed on the three-phase series transformer, transformed by the three-phase series transformer and impedance-regulated by the impedance adjustment mechanism on the secondary side of the three-phase series transformer, and then transmitted to the transmission line.

Optionally, the obtained synthetic voltage is superimposed on the three-phase series transformer, transformed by the three-phase series transformer and impedance-regulated by the impedance adjustment mechanism on the secondary side of the three-phase series transformer, and then transmitted to the transmission line. above, including:

When the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to open and the second switch closes, and the three-phase primary and secondary switches of the three-phase parallel transformer are connected. The vector voltage generated by voltage regulation of the side winding is directly superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude and phase;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the first switch in each phase secondary side of the three-phase series transformer to turn off and the second switch to turn off, and connect the inductor and capacitor series. Entering the loop, the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby affecting the input voltage amplitude. , phase and impedance to adjust;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the three-phase string The first switch in the secondary side of each phase of the transformer is turned off and the second switch is intermittently turned on at a preset frequency, and the impedance adjustable circuit series composed of the inductor, the capacitor and the second switch is In the loop, the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the adjustable impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby changing the input voltage. Amplitude, phase and impedance can be adjusted.

Optionally, the obtained synthetic voltage is superimposed on the three-phase series transformer, transformed by the three-phase series transformer and impedance-regulated by the impedance adjustment mechanism on the secondary side of the three-phase series transformer, and then transmitted to the transmission line. above, also includes:

When the three-phase voltage-impedance adjustable transformer operates in current-limiting mode, the inductor is connected in parallel when the first switch in each phase secondary side of the three-phase series transformer is controlled to be closed and the second switch is opened. The current limiting process is performed on the secondary winding of each phase of the three-phase series transformer.

In a third aspect, an embodiment of the present disclosure provides a three-phase voltage impedance adjustable transformer control device. Based on the three-phase voltage impedance adjustable transformer described in the first aspect of the embodiment of the present disclosure, the three-phase voltage impedance adjustable transformer control device Devices, including:

The first control module is configured to control the working state of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage;

The second control module is configured to: superimpose the obtained synthetic voltage on the three-phase series transformer, transform it by the three-phase series transformer and adjust the impedance of the secondary side of the three-phase series transformer, and then transmit it. onto the transmission lines.

Optionally, the second control module is also configured to:

Or when the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to be turned off and the second switch is intermittently turned on at a preset frequency. , the impedance adjustable circuit composed of the inductor, the capacitor and the second switch is connected in series to the loop, and the vector voltage generated by regulating the three-phase primary and secondary windings of the three-phase parallel transformer is summed in the loop The adjustable impedance is connected in series and superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude, phase and impedance.

Optionally, the second control module is further configured to: control the first switch in each phase secondary side of the three-phase series transformer to close when the three-phase voltage impedance adjustable transformer operates in current limiting mode. And when the second switch is turned off, connect the inductor in parallel to the secondary side of each phase of the three-phase series transformer. Current limiting is performed on the winding.

In a fourth aspect, embodiments of the disclosure provide a computer-readable storage medium that stores computer instructions, and the computer instructions are used to cause the computer to execute the method described in the first aspect of the embodiments of the disclosure. Three-phase voltage-impedance adjustable transformer control method.

In a fifth aspect, an embodiment of the present disclosure provides a computer device, including: a memory and a processor. The memory and the processor are communicatively connected to each other. The memory stores computer instructions. The processor executes the instructions. The computer instructions are used to execute the three-phase voltage impedance adjustable transformer control method described in the first aspect of the embodiment of the present disclosure.

In a sixth aspect, embodiments of the present disclosure provide a computer program product. The computer program product includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, the present disclosure is implemented. The three-phase voltage impedance adjustable transformer control method described in the first aspect of the embodiment.

The technical solutions of the disclosed embodiments have the following advantages:

A three-phase voltage-impedance adjustable transformer provided by an embodiment of the present disclosure includes: a three-phase parallel transformer and a three-phase series transformer, wherein the three-phase parallel transformer is connected in parallel to the corresponding phase transmission line; the primary side of each phase of the three-phase series transformer is connected in series Enter the corresponding phase transmission line, and the secondary side of each phase in the three-phase series transformer is connected to the voltage regulating device in the three-phase parallel transformer. The embodiment of the present disclosure borrows the primary and secondary windings of a three-phase parallel transformer and a three-phase series transformer to perform vector transformation and synthesis of the three-phase input voltage, and superimposes the obtained synthetic voltage onto the input voltage through the three-phase series transformer to achieve Adjust the input voltage amplitude and phase. Moreover, the design of the three-phase series transformer can adjust the voltage amplitude and phase while adjusting the impedance, which plays a beneficial role in harmonic isolation of power quality and the need to adjust the impedance on demand. Through the above design, the design capacity of the adjustable device can be greatly reduced when the capacity required for three-phase line voltage impedance adjustment is certain, which is conducive to the compact design of the device and the reduction of cost; and there are fewer adjustment links and power semiconductor devices, and the overall reliability is high , low loss; and by adjusting the impedance design, it blocks the influence of power quality and overcurrent, reduces the probability of device failure and damage, and improves reliability.

The embodiment of the present disclosure provides a three-phase voltage impedance adjustable transformer control method, which includes: controlling the working state of the voltage regulating device in the three-phase parallel transformer, vector transforming and synthesizing the three-phase input voltage; and superimposing the obtained synthetic voltage. On the three-phase series transformer, it is transformed by the three-phase series transformer and the impedance adjustment mechanism on the secondary side of the three-phase series transformer adjusts the impedance before being transmitted to the transmission line. By setting reasonable control steps for the three-phase voltage-impedance adjustable transformer, while adjusting the input voltage amplitude and phase, the impedance can also be adjusted to play a beneficial role in harmonic blocking of power quality, and the impedance can be adjusted as needed. requirements to protect the safe and reliable operation of lines and devices.

Description of the drawings

In order to more clearly explain the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The accompanying drawings illustrate some embodiments of the present disclosure. For those of ordinary skill in the art, without exerting any creative effort, other aspects can be obtained based on these drawings. Attached picture.

Figure 1 is a schematic block diagram of an example of a three-phase voltage-impedance adjustable transformer in an embodiment of the present disclosure;

Figure 2 is a topological structure diagram of an example of a three-phase voltage-impedance adjustable transformer in an embodiment of the present disclosure;

Figure 3 is a topological structure diagram of another example of a three-phase voltage-impedance adjustable transformer in an embodiment of the present disclosure;

Figure 4 shows the topological structure of the switch arm module in the embodiment of the present disclosure;

Figure 5 is a functional block diagram of the uninterruptible power shifting device in the embodiment of the present disclosure;

Figure 6 is a topological structure diagram of the uninterruptible power shifting device in the embodiment of the present disclosure;

Figure 7 is a flow chart of an example of a three-phase voltage impedance adjustable transformer control method in an embodiment of the present disclosure;

Figure 8 is a schematic structural diagram of a three-phase voltage impedance adjustable transformer control device provided by an embodiment of the present disclosure;

FIG. 9 is a composition diagram of an example of a computer device provided by an embodiment of the present disclosure.

Detailed ways

The technical solutions of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description. It does not indicate or imply that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on the present disclosure. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary; it can also be an internal connection between two components; it can be a wireless connection or a wired connection connect. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood on a case-by-case basis.

In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

In view of the problems existing in the existing voltage impedance adjustment equipment technology, embodiments of the present disclosure provide a three-phase voltage impedance adjustable transformer. As shown in FIG. 1 , the three-phase voltage-impedance adjustable transformer includes: a three-phase parallel transformer 110 and a three-phase series transformer 120 .

In some embodiments, three-phase parallel transformers are connected in parallel to corresponding phase transmission lines. Three-phase series connection The primary side of each phase of the transformer is connected in series to the corresponding phase transmission line, and the secondary side of each phase in the three-phase series transformer is connected to the voltage regulating device in the three-phase parallel transformer. For example, continuing to refer to FIG. 1 , the A-phase parallel transformer 110a, the B-phase parallel transformer 110b and the C-phase parallel transformer 110c in the three-phase parallel transformer 110 are respectively connected in parallel to the A-phase transmission line 130a, the B-phase transmission line 130b and the C-phase transmission line. Line 130c; among the three-phase series transformers, the A-phase series transformer primary side 121a, the B-phase series transformer primary side 121b and the C-phase series transformer primary side 121c are respectively connected in series to the A-phase transmission line 130a, the B-phase transmission line 130b and the C-phase transmission line. Line 130c, the A-phase series transformer secondary 122a, the B-phase series transformer secondary 122b and the C-phase series transformer secondary 122c of the three-phase series transformer 120 are connected in parallel with the A-phase parallel transformer 110a, the B-phase parallel transformer 110b and the C-phase respectively. The voltage regulating device (not shown in the figure) in the transformer 110c is connected.

By controlling the working status of the voltage regulating device in the three-phase parallel transformer, the three-phase input voltage is vector transformed and synthesized, and the resulting synthesized voltage is superimposed on the three-phase series transformer, and is transformed by the three-phase series transformer and the three-phase series transformer The impedance adjustment mechanism on the secondary side adjusts the impedance and then sends it to the transmission line to complete the effect of adjusting the input voltage amplitude, phase and impedance. Among them, the voltage regulating device and the impedance adjustment mechanism on the secondary side of the three-phase series transformer are not shown in Figure 1.

In some embodiments, each phase primary side of the three-phase series transformer includes a primary winding, and each phase primary winding is connected in series to the corresponding phase transmission line. Each secondary side of the three-phase series transformer includes an impedance adjustment mechanism. In some embodiments, the impedance adjustment mechanism includes: a secondary winding, an inductor, a first switch, a second switch, and a capacitor. Among them, one end of the secondary winding of each phase of the three-phase series transformer is respectively connected to the secondary voltage regulating device of the next adjacent phase of the three-phase parallel transformer and one end of the first switch, and the other end of the secondary winding of each phase of the three-phase series transformer One end is connected to one end of the inductor and one end of the second switch, one end of the capacitor is connected to the other end of the first switch and the other end of the inductor, and the other end of the capacitor is connected to the other end of the second switch to form a three-phase series transformer. The output terminal of the secondary side.

In some embodiments, the next adjacent phase of phase A is phase B, the next adjacent phase of phase B is phase C, and the next adjacent phase of phase C is phase A. As shown in Figure 2 or Figure 3, the primary winding n _a1 of the first phase A (ie, phase A) of the three-phase series transformer 120 is connected in series to the phase A transmission line. The first phase A secondary side of the three-phase series transformer 120 includes: secondary winding _na2 , inductor _Lna , first switch _sna1 , second switch _sna2 and capacitor _Cna . Among them, one end of the secondary winding n _a2 is connected to the secondary side voltage regulating device of the second phase B (ie, phase B) of the three-phase parallel transformer 110 and one end of the first switch s _na1 respectively, and the other end of the secondary winding n _a2 One end is connected to one end of the inductor L _na and one end of the second switch s _na2 respectively. One end of the capacitor C _na is connected to the other end of the first switch s _na1 and the other end of the inductor L _na respectively. The other end of the capacitor C _na is connected to the other end of the second switch s _na2 to form phase A of the three-phase series transformer 120 The output terminal a ₁₂ of the secondary side.

The primary winding n _b1 of the second phase B (i.e., B phase) of the three-phase series transformer 120 is connected in series to the B-phase transmission line. The second phase B secondary side of the three-phase series transformer 120 includes: secondary winding n _b2 , inductor L _nb , first switch s _nb1 , second switch s _nb2 and capacitor C _nb . Among them, one end of the secondary winding n _b2 is connected to the secondary voltage regulating device of the third phase C (i.e., phase C) of the three-phase parallel transformer 110 and one end of the first switch s _nb1 respectively, and the other end of the secondary winding n _b2 One end is connected to one end of the inductor L _nb and the second switch s _nb2 respectively. Connect one end. One end of the capacitor C _nb is connected to the other end of the first switch s _nb1 and the other end of the inductor L _nb respectively. The other end of the capacitor C _nb is connected to the other end of the second switch s _nb2 to form phase B of the three-phase series transformer 120 The output terminal b ₁₂ of the secondary side.

The primary winding n _c1 of the third phase C (i.e., C phase) of the three-phase series transformer 120 is connected in series to the C-phase transmission line. The third phase C secondary side of the three-phase series transformer 120 includes: secondary winding n _c2 , inductor L _nc , first switch s _nc1 , second switch s _nc2 and capacitor C _nc . Among them, one end of the secondary winding n _c2 is connected to the secondary voltage regulating device of the first phase A (ie, phase A) of the three-phase parallel transformer 110 and one end of the first switch s _nc1 respectively, and the other end of the secondary winding n _c2 One end is connected to one end of the inductor L _nc and one end of the second switch s _nc2 respectively. One end of the capacitor C _nc is connected to the other end of the first switch s _nc1 and the other end of the inductor L _nc respectively. The other end of the capacitor C _nc is connected to the other end of the second switch s _nc2 to form phase C of the three-phase series transformer 120 The output terminal c ₁₂ of the secondary side.

In the embodiment of the present disclosure, the design of a three-phase series-parallel transformer can realize voltage regulation while adjusting impedance, playing a beneficial role in harmonic blocking of power quality and adjusting impedance on demand. This embodiment borrows the original secondary winding of the parallel transformer and designs an asymmetric multi-tap winding on the secondary side, and then combines it with a series transformer with an impedance adjustment mechanism to achieve input voltage amplitude phase adjustment and impedance adjustment, which not only saves The number of windings used to adjust the voltage amplitude and phase on the secondary side of the parallel transformer is reduced. The design of this structure can greatly reduce the design capacity of the regulating device when the line regulating capacity requirement is certain, which is conducive to the compact design of the device and the reduction of cost.

In some embodiments, as shown in FIG. 2 , each phase of the three-phase parallel transformer 110 includes: a primary winding, a secondary winding, multiple voltage regulating devices and multiple uninterruptible power shifting devices.

Among them, the first end of the primary winding of each phase is connected to the current transmission line, and the end of the primary winding of each phase is grounded. Multiple taps are drawn from the end of the primary winding of each phase of the three-phase parallel transformer 110 to form an asymmetric winding. The asymmetric winding is connected to a voltage regulating device (such as SM-A1, SM-B1, SM- C1). Each phase secondary winding of the three-phase parallel transformer includes multiple asymmetric windings. Each asymmetric winding has multiple taps. Each asymmetric winding is connected to a voltage regulating device (such as SM-A2) after passing through the uninterruptible power shifting device. , SM-A3, SM-B2, SM-B3, SM-C2, SM-C3).

In some embodiments, the first end of the primary winding of each phase is the voltage input end of the three-phase voltage-impedance adjustable transformer (such as A ₁ , B ₁ , C ₁ ). The ends of the primary windings of each phase are connected to form a neutral point O, which can be connected to the earth through the grounding device 111. Among them, the primary and secondary windings of the three-phase parallel transformer 110 and the secondary windings of the three-phase series transformer 120 are grounded at a low potential at the end of the primary winding of the three-phase parallel transformer 110, thereby reducing the excessive potential difference between the primary and secondary windings and helping to Insulated and compact design.

In the embodiment of the present disclosure, one end of the secondary winding of each phase of the secondary side of the three-phase series transformer is sequentially connected to the next adjacent phase secondary side voltage regulating device of the three-phase parallel transformer, and the original phase primary side voltage regulating device of the three-phase parallel transformer. , the three-phase series transformer's secondary output terminal is connected.

Let's take an example in which each phase secondary side includes two voltage regulating devices. Continuing to refer to Figure 2, the input terminal a ₁₁ of the first phase A secondary side of the three-phase series transformer 120 is sequentially connected to the second phase B secondary side voltage regulating device SM-B2 of the three-phase parallel transformer 110, and the secondary side voltage regulating device SM-B2 of the three-phase parallel transformer 110. The third phase C secondary side voltage regulating device SM-C3, the first phase A primary side voltage regulating device SM-A1 in the three-phase parallel transformer 110 and The first phase A secondary output terminal a ₁₂ of the three-phase series transformer 120 is connected; wherein, the input terminal a ₁₁ of the first phase A secondary side of the three-phase series transformer 120 is connected to the second phase B secondary side of the three-phase parallel transformer 110 The input terminal b _2p of the side voltage regulating device SM-B2 is connected, and the output terminal b _2n of the secondary side voltage regulating device SM-B2 of the second phase B in the three-phase parallel transformer 110 is connected to the third phase C of the three-phase parallel transformer 110 The input terminal c _3p of the secondary side voltage regulating device SM-C3 is connected, and the output terminal c _{3n of the third phase C secondary side voltage regulating device SM-C3 in the three-phase parallel transformer 110 is connected to the first terminal c 3n} of the three-phase parallel transformer 110 The input terminal a _1p of the phase A primary side voltage regulating device SM-A1 is connected with each other, and the output terminal a _1n of the first phase A primary side voltage regulating device SM-A1 in the three-phase parallel transformer 110 is connected with the three-phase series transformer 120 The first phase A secondary output terminal a is connected to ₁₂ phases.

The input terminal b ₁₁ of the second phase B secondary of the three-phase series transformer 120 is connected in sequence with the third phase C secondary side voltage regulating device SM-C2 of the three-phase parallel transformer 110 and the first phase A secondary of the three-phase parallel transformer 110 . The side voltage regulating device SM-A3, the second phase B primary side voltage regulating device SM-B1 in the three-phase parallel transformer 110 and the second phase B secondary output terminal b ₁₂ of the three-phase series transformer 120 are connected; among them, three The input terminal b ₁₁ of the second phase B secondary side in the three-phase series transformer 120 is connected to the input terminal c _2p of the third phase C secondary side voltage regulating device SM-C2 in the three-phase parallel transformer 110 . The output terminal c _2n of the third phase C secondary voltage regulating device SM-C2 is connected to the input terminal a _3p of the first phase A secondary voltage regulating device SM-A3 in the three-phase parallel transformer 110. The three-phase parallel transformer The output terminal a _3n of the first phase A secondary side voltage regulating device SM-A3 in the three-phase parallel transformer 110 is connected to the input terminal b _1p of the second phase B primary side voltage regulating device SM-B1 in the three-phase parallel transformer 110. The three-phase The output terminal b _1n of the second phase B primary side voltage regulating device SM-B1 in the shunt transformer 110 is connected to the second phase B secondary output terminal b ₁₂ of the three-phase series transformer 120 .

The input terminal c ₁₁ of the third phase C secondary side of the three-phase series transformer 120 is connected in sequence with the first phase A secondary side voltage regulating device SM-A2 of the three-phase parallel transformer 110 and the second phase B secondary side of the three-phase parallel transformer 110 . The side voltage regulating device SM-B3, the third phase C primary side voltage regulating device SM-C1 in the three-phase parallel transformer 110 and the third phase C secondary output terminal c ₁₂ in the three-phase series transformer 120 are connected; among them, three The input terminal c ₁₁ of the third phase C secondary side in the three-phase series transformer 120 is connected to the input terminal a _2p of the first phase A secondary side voltage regulating device SM-A2 in the three-phase parallel transformer 110 . The output terminal a _2n of the first phase A secondary voltage regulating device SM-A2 is connected to the input terminal b _3p of the second phase B secondary voltage regulating device SM-B3 in the three-phase parallel transformer 110. The three-phase parallel transformer The output terminal b _3n of the second phase B secondary side voltage regulating device SM-B3 in the three-phase parallel transformer 110 is connected to the input terminal c _1p of the third phase C primary side voltage regulating device SM-C1 in the three-phase parallel transformer 110. The three-phase The output terminal c _1n of the third phase C primary side voltage regulating device SM-C1 in the parallel transformer 110 is connected to the third phase C secondary output terminal c ₁₂ of the three-phase series transformer 120 .

In some embodiments, the three-phase parallel transformer 110 shown in FIG. 2 can also be replaced with the three-phase parallel transformer 110 shown in FIG. 3 . As shown in Figure 3, each phase of the three-phase parallel transformer 110 includes: a primary winding, a secondary winding, multiple voltage regulating devices and multiple uninterruptible power shifting devices. The first end of the primary winding of each phase is connected to the original phase respectively. The transmission line is connected to the end of the primary winding of the next adjacent phase of the three-phase parallel transformer; the secondary winding of each phase of the three-phase parallel transformer includes multiple asymmetric windings, each with different There are multiple taps in the symmetrical winding, and each asymmetrical winding is connected to a voltage regulating device after passing through the uninterruptible shifting device.

In some embodiments, compared with the three-phase parallel transformer 110 in FIG. 2 , in FIG. 3 , the voltage regulating winding at the end of the primary winding of each phase in the three-phase parallel transformer 110 is switched to the secondary side. At the same time, the A-phase primary input terminal A ₁ is connected to the B-phase primary winding terminal O ₂ , the B-phase primary input terminal B ₁ is connected to the C-phase primary winding terminal O ₃ , the C-phase primary input terminal C ₁ is connected to the A-phase primary winding terminal O ₁ Connect and connect the original sides to form a triangle. Similarly, the ends of the secondary windings of the three-phase parallel transformer 110 are connected to each other to form a neutral point O, and can be grounded through the grounding device 111 .

In the embodiment of the present disclosure, as shown in FIG. 3 , the input end of the secondary winding of each phase of the three-phase series transformer 120 is sequentially connected to the secondary side voltage regulating device of the adjacent phase of the three-phase parallel transformer 110 and the three-phase parallel connection. The secondary side voltage regulating device of the current phase of the transformer 110 is connected. The input end of the secondary winding in each secondary phase of the three-phase series transformer 120 is also connected to the secondary output end of the next adjacent phase of the three-phase series transformer 120 .

Take the example of a three-phase parallel transformer in which each secondary side of a three-phase parallel transformer includes three voltage regulating devices. Continuing to refer to FIG. 3 , the input terminal a ₁₁ of the first phase A secondary side of the three-phase series transformer 120 is sequentially connected to the second phase B secondary side voltage regulating device SM-B2 of the three-phase parallel transformer 110 and the secondary side voltage regulating device SM-B2 of the three-phase parallel transformer 110 . The third phase C secondary side voltage regulating device SM-C3 is connected to the first phase A secondary side voltage regulating device SM-A1 in the three-phase parallel transformer 110 . The input terminal a ₁₁ of the first phase A secondary side in the three-phase series transformer 120 is also connected to the second phase B secondary output terminal b ₁₂ of the three-phase series transformer 120 .

The input terminal b ₁₁ of the second phase B secondary of the three-phase series transformer 120 is connected in sequence with the third phase C secondary side voltage regulating device SM-C2 of the three-phase parallel transformer 110 and the first phase A secondary of the three-phase parallel transformer 110 . The side voltage regulating device SM-A3 is connected to the second phase B secondary side voltage regulating device SM-B1 of the three-phase parallel transformer 110 . The input terminal b ₁₁ of the secondary side B of the second phase in the three-phase series transformer 120 is also connected to the output terminal c ₁₂ of the secondary side C of the third phase C in the three-phase series transformer 120 .

The input terminal c ₁₁ of the third phase C secondary side of the three-phase series transformer 120 is connected in sequence with the first phase A secondary side voltage regulating device SM-A2 of the three-phase parallel transformer 110 and the second phase B secondary side of the three-phase parallel transformer 110 . The side voltage regulating device SM-B3 is connected to the third phase C secondary side voltage regulating device SM-C1 in the three-phase parallel transformer 110 . The input terminal c ₁₁ of the third phase C secondary side of the three-phase series transformer 120 is also connected to the first phase A secondary output terminal a ₁₂ of the three-phase series transformer 120 .

In the embodiment of the present disclosure, in the three-phase series transformer, the input terminal a ₁₁ of the phase A secondary side is connected to the output terminal b ₁₂ of the phase B secondary side, and the input terminal b ₁₁ of the phase B secondary side is connected to the output terminal c ₁₂ of the phase C secondary side. , the input terminal c ₁₁ of the C phase secondary side is connected to the output terminal a ₁₂ of the A secondary side, which is equivalent to the triangle connection of the secondary side of the three-phase series transformer.

By forming a delta connection on the primary side of the three-phase parallel transformer and a delta connection on the secondary side of the three-phase series transformer, the impact of the negative sequence and zero sequence components on the output side of the three-phase system on the input side of the parallel transformer can be improved, or the output can be improved The influence of negative sequence and zero sequence components on the input side of the side three-phase system.

In this embodiment, the multi-tap asymmetric winding at the primary end of the three-phase parallel transformer and the multi-tap asymmetric winding at the adjacent phase secondary side are interconnected through the uninterruptible shifting device and through the switch bridge arm. Different bridge arm switch states can be selected. The three-phase input voltage is vector transformed and synthesized, and the resulting synthesized voltage By superimposing the series transformer with an impedance adjustment mechanism on the input voltage, the effect of adjusting the input voltage amplitude, phase and impedance is achieved.

In some embodiments, as shown in Figures 2 and 3, the voltage regulating device is a switch arm module. The switch arm module adopts a bridge structure as shown in Figure 4. The switching device _Sw in the switch arm module can also be other types of switches with on-off functions.

In some embodiments, as shown in Figure 4, S _n1 , S _n2 , and S _n3 are respectively the input terminals of the switch bridge arm module (the number of bridge arms can be increased accordingly according to the number of winding taps), and can be connected with the corresponding winding three taps. connected; S _np and S _nn are the output terminals of the switch bridge arm module respectively, and are used for interconnection with other modules or windings.

In some embodiments, as shown in Figure 5, the uninterruptible power shifting device includes: a first current limiting circuit 510 and a second current limiting circuit 520, wherein the first current limiting circuit 510 is connected to the first tap of the asymmetric winding and between the first bridge arms of the switch bridge arm module; the second tap of the asymmetric winding is connected to the second bridge arm of the switch bridge arm module; the second current limiting circuit 520 is connected to the third tap of the asymmetric winding and the switch bridge between the third bridge arms of the arm module.

In some embodiments, continuing to refer to FIG. 5 , the first current limiting circuit 510 includes: a first current limiting branch 511 and a first current limiting switch 512 , wherein the first current limiting branch 511 and the first current limiting switch 512 Parallel connection. The first current limiting branch 511 includes a first resistor or a first inductor. The second current limiting circuit 520 includes: a second current limiting branch 521 and a second current limiting switch 522, wherein the second current limiting branch 521 and the second current limiting switch 522 are connected in parallel. The second current limiting branch 521 includes a second resistor or a second inductor. Before shifting the bridge arm, first turn off the first current limiting switch 512 or the second current limiting switch 522, put the first current limiting branch 511 or the second current limiting branch 521 into operation, and then switch gears. After switching, the first current limiting switch 512 or the second current limiting switch 522 is closed. In the embodiment of the present disclosure, the bridge arm shifting refers to changing the switch state of the switch in the bridge arm.

In the embodiment of the present disclosure, A phase is selected and a resistor is selected for the current limiting branch as an example for elaboration. As shown in Figure 6, the uninterruptible power shifting device includes: a first resistor r _a11 , a second resistor r _a12 , a first limiter The current switch S _ma11 and the second current limiting switch S _ma12 . Among them, the first resistor r _a11 is connected in parallel with the first current limiting switch S _ma11 and then connected between the first tap of the asymmetric winding and the first bridge arm of the switch bridge arm module; the second tap of the asymmetric winding and the switch bridge arm The second bridge arm of the module is connected; the second resistor r _a12 is connected in parallel with the second current limiting switch S _ma12 and then connected between the third tap of the asymmetric winding and the third bridge arm of the switch bridge arm module.

Assume that u ₁ and u ₂ are the inter-turn output voltages of the upper and lower parts of the asymmetric primary winding of phase A of the three-phase parallel transformer respectively. During normal operation, the current-limiting switches S _ma11 and S _ma12 are closed, bypassing the current-limiting resistors r _a11 and r _a12 respectively. There are 7 different output voltage states between the output terminals _up and u _n :

(1) First gear: bridge arm switches s1 and s4 are closed, s2, s3, s5, and s6 are open, and the output voltage is u1;

(2) Second gear: bridge arm switches s3 and s6 are closed, s1, s2, s4, and s5 are open, and the output voltage is u2;

(3) Third gear: bridge arm switches s1 and s6 are closed, s2, s3, s4, and s5 are open, and the output voltage is u1+u2;

(4) Fourth gear: The bridge arm switches s1 and s2 are closed, s3, s4, s5, and s6 are disconnected, and the output voltage is 0; or the bridge arm switches s3 and s4 are closed, s1, s2, s5, and s6 are disconnected, and the output The voltage is also 0; or the bridge arm switches s5 and s6 are closed, s1, s2, s3, and s4 are open, and the output voltage is also 0;

(5) Fifth gear: bridge arm switches s2 and s5 are closed, s1, s3, s4, and s6 are open, and the output voltage is -(u1+u2);

(6) Sixth gear: bridge arm switches s4 and s5 are closed, s2, s3, s4, and s6 are open, and the output voltage is -u2;

(7) Seventh gear: The bridge arm switches s2 and s3 are closed, s1, s4, s5, and s6 are open, and the output voltage is -u1.

In this embodiment, the joint design of the asymmetric multi-tap primary and secondary windings of the parallel transformer and the corresponding switching bridge arm module achieves a wide range and multi-step voltage control with as few switching devices, windings and taps as possible. adjustment, further reducing the cost and volume. By using an asymmetric winding and using a smaller number of windings, taps, and switching devices, a greater variety of voltage regulation is achieved. Furthermore, since the voltage output by the switching arm module of the adjacent phase and the voltage output by the switching arm module of the current phase have certain differences in amplitude and phase, the voltage output by the switching arm module of different phases has a certain difference in amplitude and phase. After the voltage is superimposed, the amplitude and phase of the input voltage can be changed.

In some embodiments, before shifting, the first current-limiting switch S _ma11 or the second current-limiting switch S _ma12 is turned off, and the first resistor r _a11 or the second resistor r _a12 is put in, and then the gear is switched. After the gear is switched, the first current-limiting switch S _ma11 or the second current-limiting switch S _ma12 is closed.

In some embodiments, in order to achieve uninterrupted output voltage, when switching gears, without a transition plan, it is difficult to ensure that no short circuit occurs in the winding. For example, take the process of switching from first gear to second gear as an example. If the switches S ₁ and S ₄ that are closed in the first gear state are not opened, close the switches S ₃ and S that are to be closed in the second gear state. _6. A short circuit will occur in the line between u _p and u _n . If you wait until the switches S ₁ and S ₄ that are closed in the first gear state are opened before closing the switches S ₃ and S ₆ in the second gear state, the output voltage will be interrupted.

Therefore, in view of this shifting logic relationship, this embodiment provides an uninterruptible power shifting method. Before switching the first gear to the second gear, the current limiting switch S _ma11 is first opened and the corresponding switch in the second gear is closed. S ₃ , then open the closed switch S ₁ in the first gear, wait until the switch S ₁ is completely opened, and then close the current limiting switch S _ma11 ; then open the current limiting switch S _ma12 and close the corresponding switch in the second gear. S ₆ , then open the closed switch S ₄ in the first gear, wait until the switch S ₄ is completely open, and then close the current limiting switch S _ma12 . This process is the shifting process. This method allows the device to adjust the voltage without short-term voltage interruption caused by switch switching.

Embodiments of the present disclosure also provide a three-phase voltage and impedance adjustable transformer control method based on the three-phase voltage and impedance adjustable transformer shown in Figure 2 or Figure 3. The three-phase voltage and impedance adjustable transformer control method is as shown in Figure 7 , including the following steps:

Step S1: Control the working status of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage.

In some embodiments, by selecting different working states of the voltage regulating device in Figure 2 or Figure 3, it is possible to To vector transform and synthesize the three-phase input voltage.

Step S2: The obtained synthetic voltage is superimposed on the three-phase series transformer, transformed by the three-phase series transformer and impedance-regulated by the impedance adjustment mechanism on the secondary side of the three-phase series transformer, and then transmitted to the transmission line.

In some embodiments, step S2 includes:

When the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to be open and the second switch is closed, thereby regulating the voltage of the three-phase primary and secondary windings of the three-phase parallel transformer. The vector voltage is directly superimposed on the secondary winding of the three-phase series transformer to adjust the input voltage amplitude and phase.

In the disclosed embodiment, phase A is taken as an example. During normal operation, the switch s _na1 is open and the switch s _na2 is closed. The three-phase series transformer only performs the function of voltage conversion, and the path impedance is small, only the transformer winding itself. At this time, the corresponding three-phase primary and secondary windings of the three-phase parallel transformer make corresponding selections through the voltage regulating device to generate a vector voltage. This vector voltage is directly superimposed on the secondary winding of the three-phase series transformer. The transformer is transformed according to a certain transformation ratio and then added to the line to realize the adjustment of the input voltage amplitude and phase of the three-phase voltage impedance adjustable transformer.

In some embodiments, step S2 includes: when the three-phase voltage-impedance adjustable transformer is operating normally, controlling the first switch to open and the second switch to open the secondary side of each phase of the three-phase series transformer to connect the inductor and capacitor. Into the loop in series, the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude, phase and impedance. adjust.

In the embodiment of the present disclosure, phase A is taken as an example. During normal operation, the switch s _na1 is turned off, the switch s _na2 is turned off, and the inductor L _na and capacitor C _na enter the loop in series (the parameters of the inductor L _na and capacitor C _na Set to the resonant condition, and the resonant frequency is usually set to the rated operating frequency of the transformer). At this time, the impedance after L _na and capacitor C _na are connected in series is approximately zero at the resonant frequency point, which does not affect the regulated output of the rated voltage, but at other frequencies (called is the harmonic frequency), the impedance after L _na and capacitor C _na are connected in series is relatively large. The three-phase series transformer exhibits the functions of voltage conversion and high harmonic impedance at the same time, that is, the specified vector voltage generated by the three-phase parallel transformer is connected in series with the impedance. Superimposed on the secondary winding of the three-phase series transformer, it is transformed by the three-phase series transformer according to a certain transformation ratio and then added to the line to realize the adjustment of the input voltage amplitude and phase of the three-phase voltage impedance adjustable transformer and the increase of the harmonic impedance. The increase in wave impedance can play the role of harmonic blocking, which can protect the three-phase voltage and impedance adjustable transformer from the influence of harmonics. For example, harmonics will increase the losses of the three-phase voltage and impedance adjustable transformer. Increasing the three-phase voltage and impedance adjustable transformer can Adjust the aging degree of the transformer and destroy the voltage regulation quality at the rated frequency.

In some embodiments, step S2 includes: when the three-phase voltage-impedance adjustable transformer is operating normally, controlling the first switch in each phase secondary side of the three-phase series transformer to turn off and the second switch to turn on intermittently at a preset frequency. When the circuit is disconnected, the impedance adjustable circuit composed of the inductor, capacitor and the second switch is connected in series to the loop. The vector voltage generated by regulating the voltage of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the adjustable impedance in the loop and then superimposed on the three phases. It is connected in series to the secondary winding of the transformer to adjust the input voltage amplitude, phase and impedance.

In the embodiment of the present disclosure, phase A is taken as an example. During normal operation, the switch s _na1 is turned off, and the switch s _na2 is intermittently turned on and off at a certain frequency, which is equivalent to the inductor L _na and the capacitor C _na being connected in series with the switch s. _na2 is connected in parallel to form a flexible and adjustable impedance circuit. This circuit is connected in series to the loop. The specified vector voltage generated by the three-phase parallel transformer and the adjustable impedance are connected in series and superimposed on the secondary winding of the three-phase series transformer. After the three-phase series transformer presses After a certain transformation ratio is added to the line, the input voltage amplitude phase adjustment of the three-phase voltage impedance adjustable transformer and the flexible adjustment of the impedance can be realized at the same time. When used, the three-phase voltage-impedance adjustable transformer can realize decoupling adjustment and specified size adjustment of voltage and impedance according to actual adjustment needs.

In some embodiments, when the three-phase voltage-impedance adjustable transformer operates in current-limiting mode, when the first switch in each phase secondary side of the three-phase series transformer is closed and the second switch is disconnected, the inductor is connected in parallel to the three-phase series transformer. The current limiting treatment of the primary winding and circuit is carried out on the secondary winding of each phase of the transformer.

In the embodiment of the present disclosure, phase A is taken as an example. When current limiting operation is required, s _na1 is closed and s _na2 is opened, which is equivalent to the inductor L _na in the multiplexed impedance adjustment circuit, which is connected in parallel to the three-phase series connection. On the secondary winding of the transformer, the inductance equivalent L _na is transformed by the three-phase series transformer according to a certain transformation ratio and then added to the line. At this time, the three-phase parallel transformer can stop outputting voltage, which is equivalent to the three-phase series transformer presenting a current-limiting reactor. Function is used to limit excessive current generation.

The embodiment of the present disclosure provides a three-phase voltage impedance adjustable transformer control method, which includes: controlling the working state of the voltage regulating device in the three-phase parallel transformer, vector transforming and synthesizing the three-phase input voltage; and superimposing the obtained synthetic voltage. On the three-phase series transformer, it is transformed by the three-phase series transformer and the impedance adjustment mechanism on the secondary side of the three-phase series transformer adjusts the impedance before being transmitted to the transmission line. By setting reasonable control steps for the three-phase voltage-impedance adjustable transformer, while adjusting the input voltage amplitude and phase, the line impedance can also be adjusted, which plays a beneficial role in harmonic blocking of power quality and can be adjusted on demand. impedance requirements.

Based on the three-phase voltage-impedance adjustable transformer provided by the aforementioned embodiments of the present disclosure, the embodiment of the present disclosure provides a three-phase voltage-impedance adjustable transformer control device. The device includes each unit included and each part included in each unit. , can be realized through the processor in the computer equipment; of course, it can also be realized through specific logic circuits; during the implementation process, the processor can be a central processing unit (Central Processing Unit, CPU), a microprocessor (Microprocessor Unit, MPU), Digital Signal Processor (DSP) or Field-Programmable Gate Array (FPGA), etc.

Figure 8 is a schematic structural diagram of a three-phase voltage impedance adjustable transformer control device provided by an embodiment of the present disclosure. As shown in Figure 8, the three-phase voltage impedance adjustable transformer control device 800 includes:

The first control module 810 is configured to control the working state of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage;

The second control module 820 is configured to superimpose the obtained synthetic voltage on the three-phase series transformer, transform it through the three-phase series transformer and adjust the impedance of the secondary side of the three-phase series transformer, and then transmit it to the transmission line.

In some embodiments, the second control module 820 is further configured to:

When the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to be open and the second switch is closed, thereby regulating the voltage of the three-phase primary and secondary windings of the three-phase parallel transformer. The vector voltage is directly superimposed on the secondary winding of the three-phase series transformer to adjust the input voltage amplitude and phase;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the first switch in each phase secondary side of the three-phase series transformer to open and the second switch to open, put the inductor and capacitor in series into the loop, and connect the three-phase parallel transformer. The vector voltage generated by the voltage regulation of the three-phase primary and secondary windings is connected in series with the impedance in the loop and then superimposed on the secondary windings of the three-phase series transformer, thereby adjusting the input voltage amplitude, phase and impedance;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the first switch in each phase secondary side of the three-phase series transformer to open and the second switch to open intermittently according to the preset frequency, so as to connect the inductor, capacitor and second switch. The adjustable impedance circuit composed of switches is connected in series to the loop, and the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the adjustable impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby affecting the Input voltage amplitude, phase and impedance are adjusted.

In some embodiments, the second control module 820 is further configured to:

In the case of the current-limited operation of the three-phase voltage-impedance adjustable transformer, when the first switch in the secondary side of each phase of the three-phase series transformer is closed and the second switch is opened, the inductor is connected in parallel to the secondary winding of each phase of the three-phase series transformer. Perform current limiting processing.

The description of the above device embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the device embodiments of the present disclosure, please refer to the description of the method embodiments of the present disclosure for understanding.

The embodiment of the present disclosure provides a computer device. As shown in Figure 9, the device may include a processor 91 and a memory 92. The processor 91 and the memory 92 may be connected through a bus or other means. Figure 9 takes the connection through a bus as an example. .

The processor 91 may be a central processing unit (Central Processing Unit, CPU). The processor 91 can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or Other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or combinations of the above types of chips.

As a non-transitory computer-readable storage medium, the memory 92 can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as corresponding program instructions/modules in embodiments of the present disclosure. The processor 91 executes various functional applications and data processing of the processor by running non-transient software programs, instructions and modules stored in the memory 92, that is, realizing the three-phase voltage impedance adjustable transformer control in the above method embodiment. method.

The memory 92 may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required for at least one function; the storage data area may store data created by the processor 91 and the like. Additionally, memory 92 may include high speed random access memory and may also Includes non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 92 optionally includes memory located remotely relative to the processor 91 , and these remote memories may be connected to the processor 91 through a network. Examples of the above-mentioned networks include but are not limited to the Internet, corporate intranets, corporate intranets, mobile communication networks and combinations thereof.

One or more modules are stored in the memory 92, and when executed by the processor 91, the three-phase voltage impedance adjustable transformer control method shown in Figure 7 is executed.

Embodiments of the present disclosure provide a computer-readable storage medium that stores computer instructions, and the computer instructions are used to cause the computer to execute the steps in the above method.

Embodiments of the present disclosure provide a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, the steps in the above method are implemented.

The specific details of the above computer equipment can be understood by referring to the corresponding descriptions and effects in the embodiments shown in FIGS. 1 to 7 .

Those skilled in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. The program can be stored in a computer-readable storage medium. During execution, the process may include the processes of the embodiments of each of the above methods. Among them, the storage media can be magnetic disks, optical disks, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (Flash Memory), hard disk (Hard Disk Drive). , abbreviation: HDD) or solid-state drive (Solid-State Drive, SSD), etc.; the storage medium can also include a combination of the above types of memories.

Obviously, the above-mentioned embodiments are only examples for clear explanation and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. The obvious changes or changes derived therefrom are still within the scope of protection created by the present disclosure.

Industrial applicability

Embodiments of the present disclosure provide a three-phase voltage-impedance adjustable transformer and a control method, control device, computer equipment, storage medium, and computer program product. The three-phase voltage-impedance adjustable transformer includes: a three-phase parallel transformer and a three-phase series transformer. . Among them, the three-phase parallel transformer is connected in parallel to the corresponding phase transmission line; the primary side of each phase of the three-phase series transformer is connected in series to the corresponding phase transmission line, and the secondary side of each phase in the three-phase series transformer is connected to the voltage regulating device in the three-phase parallel transformer. Through the above design, the design capacity of the adjustable device can be greatly reduced when the capacity required for three-phase line voltage impedance adjustment is certain, which is beneficial to the compact design of the device and the reduction of cost. And by adjusting the impedance design, the probability of failure and damage of the three-phase voltage impedance adjustable transformer is reduced.

Claims

A three-phase voltage-impedance adjustable transformer, including: a three-phase parallel transformer and a three-phase series transformer, wherein,

The three-phase parallel transformers are connected in parallel to the corresponding phase transmission lines;

The primary side of each phase of the three-phase series transformer is connected in series to the corresponding phase transmission line, and the secondary side of each phase of the three-phase series transformer is connected to the voltage regulating device in the three-phase parallel transformer;

By controlling the working state of the voltage regulating device in the three-phase parallel transformer, the three-phase input voltage is vector transformed and synthesized, and the resulting synthesized voltage is superimposed on the three-phase series transformer. The impedance is adjusted by the impedance adjusting mechanism on the secondary side of the three-phase series transformer and then transmitted to the transmission line.
The three-phase voltage-impedance adjustable transformer according to claim 1, wherein each phase secondary side of the three-phase series transformer includes: a secondary winding, an inductor, a first switch, a second switch and a capacitor, wherein,

One end of the secondary winding of each phase of the three-phase series transformer is respectively connected to the secondary side voltage regulating device of the next adjacent phase of the three-phase parallel transformer and one end of the first switch. The other end of the phase secondary winding is connected to one end of the inductor and one end of the second switch respectively, and one end of the capacitor is connected to the other end of the first switch and the other end of the inductor respectively. The other end of the capacitor is connected to the other end of the second switch to form the output end of the secondary side of the three-phase series transformer.
The three-phase voltage-impedance adjustable transformer according to claim 2, wherein each phase of the three-phase parallel transformer includes: a primary winding, a secondary winding, a plurality of voltage regulating devices and a plurality of uninterruptible power shifting devices, in,

The first end of the primary winding of each phase is respectively connected to the current transmission line and the end of the primary winding of the next adjacent phase of the three-phase parallel transformer;

Each phase secondary winding of the three-phase parallel transformer includes multiple asymmetric windings. Each asymmetric winding has multiple taps. Each asymmetric winding is connected to one of the voltage regulators after passing through the uninterruptible power shifting device. device.
The three-phase voltage-impedance adjustable transformer according to claim 2, wherein each phase of the three-phase parallel transformer includes: a primary winding, a secondary winding, a plurality of voltage regulating devices and a plurality of uninterruptible power shifting devices, in,

The first end of the primary winding of each phase is connected to the transmission line of the current phase, and the end of the primary winding of each phase is grounded;

Multiple taps are drawn from the end of the primary winding of each phase of the three-phase parallel transformer to form an asymmetric winding, and the asymmetric winding is connected to one of the voltage regulating devices after passing through the uninterruptible power shifting device;

Each phase secondary winding of the three-phase parallel transformer includes multiple asymmetric windings. Each asymmetric winding has multiple taps. Each asymmetric winding is connected to one of the voltage regulators after passing through the uninterruptible power shifting device. device.
The three-phase voltage-impedance adjustable transformer according to claim 3, wherein,

One end of the secondary winding in each phase of the secondary side of the three-phase series transformer is sequentially connected to the secondary side voltage regulating device of the two adjacent phases of the three-phase parallel transformer and the secondary side of the original phase of the three-phase parallel transformer. Pressure regulating device connection;

One end of the secondary winding in each secondary phase of the three-phase series transformer is also connected to the secondary output end of the next adjacent phase of the three-phase series transformer.
The three-phase voltage-impedance adjustable transformer according to claim 4, wherein,

One end of the secondary winding in each phase of the secondary side of the three-phase series transformer is sequentially connected to the secondary side voltage regulating device of the two adjacent phases of the three-phase parallel transformer and the primary side of the original phase of the three-phase parallel transformer. The voltage regulating device is connected to the secondary output end of the current phase of the three-phase series transformer.
The three-phase voltage-impedance adjustable transformer according to claim 3 or 4, wherein the voltage regulating device is a switching arm module, and the switching arm module adopts a bridge structure.
The three-phase voltage-impedance adjustable transformer according to claim 7, wherein the uninterruptible power shifting device includes: a first current limiting circuit and a second current limiting circuit, wherein,

The first current limiting circuit is connected between the first tap of the asymmetric winding and the first bridge arm of the switch bridge arm module;

The second tap of the asymmetric winding is connected to the second bridge arm of the switch bridge arm module;

The second current limiting circuit is connected between the third tap of the asymmetric winding and the third bridge arm of the switch arm module.
The three-phase voltage-impedance adjustable transformer according to claim 8, wherein,

The first current limiting circuit includes: a first current limiting branch and a first current limiting switch, wherein the first current limiting branch and the first current limiting switch are connected in parallel, and the first current limiting branch path, including the first resistor or the first inductor;

The second current limiting circuit includes: a second current limiting branch and a second current limiting switch, wherein the second current limiting branch is connected in parallel with the second current limiting switch, and the second current limiting branch path, including a second resistor or a second inductor;

Before shifting gears, first turn off the first current-limiting switch or the second current-limiting switch, put in the first current-limiting branch or the second current-limiting branch, and then switch gears. , close the first current-limiting switch or the second current-limiting switch.
A three-phase voltage impedance adjustable transformer control method, based on the three-phase voltage impedance adjustable transformer according to any one of claims 1 to 9, the three-phase voltage impedance adjustable transformer control method includes:

Control the working state of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage;

The obtained synthetic voltage is superimposed on the three-phase series transformer, transformed by the three-phase series transformer and impedance-regulated by the impedance adjustment mechanism on the secondary side of the three-phase series transformer, and then transmitted to the transmission line.
The three-phase voltage impedance adjustable transformer control method according to claim 10, wherein the obtained synthetic voltage is superimposed on the three-phase series transformer, and is transformed through the three-phase series transformer. The impedance adjustment mechanism of the transformer transformer and the secondary side of the three-phase series transformer adjusts the impedance and then transmits it to the transmission line, including:

When the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to open and the second switch closes, and the three-phase primary and secondary switches of the three-phase parallel transformer are connected. The vector voltage generated by voltage regulation of the side winding is directly superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude and phase;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the first switch in each phase secondary side of the three-phase series transformer to turn off and the second switch to turn off, and connect the inductor and capacitor series. Entering the loop, the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby affecting the input voltage amplitude. , phase and impedance to adjust;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to be turned off and the second switch is intermittently turned on at a preset frequency. , the impedance adjustable circuit composed of the inductor, the capacitor and the second switch is connected in series to the loop, and the vector voltage generated by regulating the three-phase primary and secondary windings of the three-phase parallel transformer is summed in the loop The adjustable impedance is connected in series and superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude, phase and impedance.
The three-phase voltage impedance adjustable transformer control method according to claim 11, wherein the obtained synthetic voltage is superimposed on the three-phase series transformer, and is transformed by the three-phase series transformer and the three-phase The impedance adjustment mechanism on the secondary side of the series transformer adjusts the impedance and then delivers it to the transmission line, which also includes:

When the three-phase voltage-impedance adjustable transformer operates in current-limiting mode, the inductor is connected in parallel when the first switch in each phase secondary side of the three-phase series transformer is controlled to be closed and the second switch is opened. The current limiting process is performed on the secondary winding of each phase of the three-phase series transformer.
A three-phase voltage impedance adjustable transformer control device, based on the three-phase voltage impedance adjustable transformer according to any one of claims 1 to 9, the three-phase voltage impedance adjustable transformer control device includes:

The first control module is configured to control the working state of the voltage regulating device in the three-phase parallel transformer, and perform vector transformation and synthesis of the three-phase input voltage;

The second control module is configured to: superimpose the obtained synthetic voltage on the three-phase series transformer, transform it by the three-phase series transformer and adjust the impedance of the secondary side of the three-phase series transformer, and then transmit it. onto the transmission lines.
The three-phase voltage impedance adjustable transformer control device according to claim 13, wherein the second control module is further configured to:

When the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to open and the second switch closes, and the three-phase primary and secondary switches of the three-phase parallel transformer are connected. The vector voltage generated by voltage regulation of the side winding is directly superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude and phase;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, control the first switch in each phase secondary side of the three-phase series transformer to turn off and the second switch to turn off, and connect the inductor and capacitor series. Entering the loop, the vector voltage generated by the voltage regulation of the three-phase primary and secondary windings of the three-phase parallel transformer is connected in series with the impedance in the loop and then superimposed on the secondary winding of the three-phase series transformer, thereby affecting the input voltage amplitude. , phase and impedance to adjust;

Or when the three-phase voltage-impedance adjustable transformer is operating normally, the first switch in each phase secondary side of the three-phase series transformer is controlled to be turned off and the second switch is intermittently turned on at a preset frequency. , the impedance adjustable circuit composed of the inductor, the capacitor and the second switch is connected in series to the loop, and the vector voltage generated by regulating the three-phase primary and secondary windings of the three-phase parallel transformer is summed in the loop The adjustable impedance is connected in series and superimposed on the secondary winding of the three-phase series transformer, thereby adjusting the input voltage amplitude, phase and impedance.
The three-phase voltage impedance adjustable transformer control device according to claim 14, wherein the second control module is further configured to:

When the three-phase voltage-impedance adjustable transformer operates in current-limiting mode, the inductor is connected in parallel when the first switch in each phase secondary side of the three-phase series transformer is controlled to be closed and the second switch is opened. The current limiting process is performed on the secondary winding of each phase of the three-phase series transformer.
A computer-readable storage medium, the computer-readable storage medium stores computer instructions, the computer instructions are used to cause the computer to perform the three-phase voltage impedance adjustable transformer control as described in any one of claims 10-12 method.
A computer device, including: a memory and a processor. The memory and the processor are communicatively connected to each other. The memory stores computer instructions. The processor executes the computer instructions to execute the claims. 10-12 Any one of the three-phase voltage impedance adjustable transformer control methods.
A computer program product. The computer program product includes a non-transitory computer-readable storage medium storing a computer program. When the computer program is read and executed by a computer, it implements any one of claims 10-12. Three-phase voltage-impedance adjustable transformer control method.