A compensation control structure for a voltage regulator

Abstract

The present invention discloses a compensation control structure for a voltage regulator, comprising: an input node group, an output node group, a compensation transformer group, a compensation control switch group, a polarity control switch group, and a protection circuit group; the input node group is used for connecting to an input phase line to obtain an input voltage; the compensation transformer group is used for outputting a compensation voltage to perform forward compensation or reverse compensation on the input voltage; the compensation control switch group is used for controlling the input of the compensation voltage to the input voltage; the polarity control switch group is used for controlling the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage, and when the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage; the output node group is used for outputting the input voltage after forward compensation or reverse compensation. By setting the compensation transformer group, the compensation control switch group, and the polarity control switch group, the adjustment of the input voltage is realized. The present invention is mainly used in the technical field of voltage regulators.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage regulators, and particularly to a compensation control structure for a voltage regulator. Background Art

[0002] Common AC voltage regulators generally use the method of adjusting the winding conventionally to compensate the output voltage. However, this compensation method cannot compensate for a relatively high input voltage, and the entire circuit structure is complex.

[0003] Therefore, there is an urgent need in the industry for a voltage regulator control structure with a simple structure to achieve effective compensation for different input voltages. Summary of the Invention

[0004] The object of the present invention is to provide a compensation control structure for a voltage regulator to solve one or more technical problems existing in the prior art, and at least provide a beneficial alternative or creative condition.

[0005] The solution of the present invention to solve its technical problems is: providing a compensation control structure for a voltage regulator, including: an input node group, an output node group, a compensation transformer group, a compensation control switch group, a polarity control switch group, and a protection circuit group;

[0006] The input node group is used to connect to the input phase wire to obtain the input voltage;

[0007] The compensation transformer group is used to output a compensation voltage to perform forward compensation or reverse compensation on the input voltage;

[0008] The compensation control switch group is used to control the input of the compensation voltage to the input voltage;

[0009] The polarity control switch group is used to control the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage. When the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage;

[0010] The output node group is used to output the input voltage after forward compensation or reverse compensation.

[0011] Further, the present compensation control structure further includes a protection circuit group;

[0012] The protection circuit group is used to limit the current of the compensation transformer group before the compensation control switch group inputs the compensation voltage to the input voltage.

[0013] Further, the protection circuit group includes: a first protection circuit, a second protection circuit, and a third protection circuit;

[0014] The input node group includes: a first input node, a second input node, and a third input node;

[0015] The output node group includes: a first output node, a second output node, and a third output node;

[0016] The first input node, the second input node, and the third input node are used to connect to the three-phase power supply in delta connection;

[0017] The compensation transformer group includes: the first group of the 1st compensation transformer, the first group of the 2nd compensation transformer,..., the first group of the ith compensation transformer; the second group of the 1st compensation transformer, the second group of the 2nd compensation transformer,..., the second group of the ith compensation transformer; the third group of the 1st compensation transformer, the third group of the 2nd compensation transformer,..., the third group of the ith compensation transformer;

[0018] The compensation control switch group includes: the first group of the 1st compensation control switch, the first group of the 2nd compensation control switch,..., the first group of the ith compensation control switch; the second group of the 1st compensation control switch, the second group of the 2nd compensation control switch,..., the second group of the ith compensation control switch; the third group of the 1st compensation control switch, the third group of the 2nd compensation control switch,..., the third group of the ith compensation control switch;

[0019] The polarity control switch group includes: the 1st polarity control switch, the 2nd polarity control switch, and the 3rd polarity control switch;

[0020] The secondary windings of the first group of the 1st compensation transformer, the secondary windings of the first group of the 2nd compensation transformer,..., the secondary windings of the first group of the ith compensation transformer are connected in series to obtain a first winding string. The head tap of the first winding string is connected to the first input node, and the tail tap of the first winding string is connected to the first output node;

[0021] The first end taps of the primary windings of the first group of the 1st compensation transformer, the first end taps of the primary windings of the first group of the 2nd compensation transformer,..., the first end taps of the primary windings of the first group of the ith compensation transformer are all connected to the fixed end of the 1st polarity control switch. The first selection end of the 1st polarity control switch is connected to the first output node through a first protection circuit, and the second selection end of the 1st polarity control switch is connected to the second output node;

[0022] The second end taps of the primary windings of the first group of the jth compensation transformer are connected to the fixed end of the first group of the jth compensation control switch. The first selection end of the first group of the jth compensation control switch is connected to the first output node through a first protection circuit, and the second selection end of the first group of the jth compensation control switch is connected to the second output node;

[0023] The secondary windings of the first compensation transformer in the second group, the secondary windings of the second compensation transformer in the second group, …, the secondary windings of the i-th compensation transformer in the second group are connected in series to obtain a second winding string. The leading tap of the second winding string is connected to the second input node, and the trailing tap of the second winding string is connected to the second output node;

[0024] The first end taps of the primary windings of the first compensation transformer in the second group, the first end taps of the primary windings of the second compensation transformer in the second group, …, the first end taps of the primary windings of the i-th compensation transformer in the second group are all connected to the fixed end of the second polarity control switch. The first selection end of the second polarity control switch is connected to the second output node through a second protection circuit, and the second selection end of the second polarity control switch is connected to the third output node;

[0025] The second end tap of the primary winding of the j-th compensation transformer in the second group is connected to the fixed end of the j-th compensation control switch in the second group. The first selection end of the j-th compensation control switch in the second group is connected to the second output node through a second protection circuit, and the second selection end of the j-th compensation control switch in the second group is connected to the third output node;

[0026] The secondary windings of the first compensation transformer in the third group, the secondary windings of the second compensation transformer in the third group, …, the secondary windings of the i-th compensation transformer in the third group are connected in series to obtain a third winding string. The leading tap of the third winding string is connected to the third input node, and the trailing tap of the second winding string is connected to the third output node W;

[0027] The first end taps of the primary windings of the first compensation transformer in the third group, the first end taps of the primary windings of the second compensation transformer in the third group, …, the first end taps of the primary windings of the i-th compensation transformer in the third group are all connected to the fixed end of the third polarity control switch. The first selection end of the third polarity control switch is connected to the third output node through a third protection circuit, and the second selection end of the third polarity control switch is connected to the first output node;

[0028] The second end tap of the primary winding of the j-th compensation transformer in the third group is connected to the fixed end of the j-th compensation control switch in the third group. The first selection end of the j-th compensation control switch in the third group is connected to the third output node W through a third protection circuit, and the second selection end of the j-th compensation control switch in the third group is connected to the first output node;

[0029] Wherein, i≥2, i is a positive integer, and j = 1, 2, …, i.

[0030] Further, the first protection circuit includes: a first fuse, a first resistor, and a first protection switch;

[0031] One end of the first fuse is connected to the first output node, and the other end of the first fuse is connected to one end of the first resistor and one end of the first protection switch. The other end of the first protection switch is respectively connected to the other end of the first resistor, the first selection end of the first polarity control switch, and the first selection end of the first group of the jth compensation control switches.

[0032] Further, the second protection circuit includes: a second fuse, a second resistor, and a second protection switch;

[0033] One end of the second fuse is connected to the second output node, and the other end of the second fuse is connected to one end of the second resistor and one end of the second protection switch. The other end of the second protection switch is respectively connected to the other end of the second resistor, the first selection end of the second polarity control switch, and the first selection end of the second group of the jth compensation control switches.

[0034] Further, the third protection circuit includes: a third fuse, a third resistor, and a third protection switch;

[0035] One end of the third fuse is connected to the third output node, and the other end of the third fuse is connected to one end of the third resistor and one end of the third protection switch. The other end of the third protection switch is respectively connected to the other end of the third resistor, the first selection end of the third polarity control switch, and the first selection end of the third group of the jth compensation control switches.

[0036] Further, the protection circuit group includes: a first protection circuit, a second protection circuit, and a third protection circuit;

[0037] The input node group includes: a first input node, a second input node, a third input node, and a fourth input node;

[0038] The output node group includes: a first output node, a second output node, a third output node, and a fourth output node;

[0039] The fourth input node is connected to the fourth output node through a wire;

[0040] The first input node, the second input node, the third input node, and the fourth input node are used to connect the three-phase electricity in Y connection, wherein the fourth input node is used to connect the neutral line;

[0041] The compensation transformer group includes: the first group of the 1st compensation transformer, the first group of the 2nd compensation transformer, …, the first group of the ith compensation transformer; the second group of the 1st compensation transformer, the second group of the 2nd compensation transformer, …, the second group of the ith compensation transformer; the third group of the 1st compensation transformer, the third group of the 2nd compensation transformer, …, the third group of the ith compensation transformer;

[0042] The compensation control switch group includes: the first group of the 1st compensation control switch, the first group of the 2nd compensation control switch, …, the first group of the ith compensation control switch; the second group of the 1st compensation control switch, the second group of the 2nd compensation control switch, …, the second group of the ith compensation control switch; the third group of the 1st compensation control switch, the third group of the 2nd compensation control switch, …, the third group of the ith compensation control switch;

[0043] The polarity control switch group includes: the 1st polarity control switch, the 2nd polarity control switch, and the 3rd polarity control switch;

[0044] The secondary windings of the first group of the 1st compensation transformer, the first group of the 2nd compensation transformer, …, the first group of the ith compensation transformer are connected in series to obtain a first winding string. The head tap of the first winding string is connected to the first input node, and the tail tap of the first winding string is connected to the first output node;

[0045] The first end taps of the primary windings of the first group of the 1st compensation transformer, the first group of the 2nd compensation transformer, …, the first group of the ith compensation transformer are all connected to the fixed end of the 1st polarity control switch. The first selection end of the 1st polarity control switch is connected to the first output node through a first protection circuit, and the second selection end of the 1st polarity control switch is connected to the fourth output node;

[0046] The second end tap of the primary winding of the first group of the jth compensation transformer is connected to the fixed end of the first group of the jth compensation control switch. The first selection end of the first group of the jth compensation control switch is connected to the first output node through a first protection circuit, and the second selection end of the first group of the jth compensation control switch is connected to the fourth output node;

[0047] The secondary windings of the second group of the 1st compensation transformer, the second group of the 2nd compensation transformer, …, the second group of the ith compensation transformer are connected in series to obtain a second winding string. The head tap of the second winding string is connected to the second input node, and the tail tap of the second winding string is connected to the second output node;

[0048] The first end taps of the primary windings of the second group of the 1st compensation transformer, the second group of the 2nd compensation transformer, …, the second group of the ith compensation transformer are all connected to the fixed end of the 2nd polarity control switch. The first selection end of the 2nd polarity control switch is connected to the second output node through a second protection circuit, and the second selection end of the 2nd polarity control switch is connected to the fourth output node;

[0049] The second end tap of the primary winding of the j-th compensation transformer in the second group is connected to the fixed end of the j-th compensation control switch in the second group. The first selection end of the j-th compensation control switch in the second group is connected to the second output node through the second protection circuit, and the second selection end of the j-th compensation control switch in the second group is connected to the fourth output node;

[0050] The secondary windings of the first compensation transformer in the third group, the secondary windings of the second compensation transformer in the third group, …, the secondary windings of the i-th compensation transformer in the third group are connected in series to obtain a third winding string. The first end tap of the third winding string is connected to the third input node, and the last end tap of the second winding string is connected to the third output node;

[0051] The first end taps of the primary windings of the first compensation transformer in the third group, the first end taps of the primary windings of the second compensation transformer in the third group, …, the first end taps of the primary windings of the i-th compensation transformer in the third group are all connected to the fixed end of the 3rd polarity control switch. The first selection end of the 3rd polarity control switch is connected to the third output node through the third protection circuit, and the second selection end of the 3rd polarity control switch is connected to the fourth output node;

[0052] The second end tap of the primary winding of the j-th compensation transformer in the third group is connected to the fixed end of the j-th compensation control switch in the third group. The first selection end of the j-th compensation control switch in the third group is connected to the third output node through the third protection circuit, and the second selection end of the j-th compensation control switch in the third group is connected to the fourth output node;

[0053] Wherein, i≥2, i is a positive integer, and j = 1, 2, …, i

[0054] Furthermore, the first protection circuit includes: a first fuse, a first resistor, and a first protection switch;

[0055] One end of the first fuse is connected to the first output node, the other end of the first fuse is connected to one end of the first resistor and one end of the first protection switch, and the other end of the first protection switch is respectively connected to the other end of the first resistor, the first selection end of the 1st polarity control switch, and the first selection end of the j-th compensation control switch in the first group.

[0056] Furthermore, the second protection circuit includes: a second fuse, a second resistor, and a second protection switch;

[0057] One end of the second fuse is connected to the second output node, the other end of the second fuse is connected to one end of the second resistor and one end of the second protection switch, and the other end of the second protection switch is respectively connected to the other end of the second resistor, the first selection end of the 2nd polarity control switch, and the first selection end of the j-th compensation control switch in the second group.

[0058] Further, the third protection circuit includes: a third fuse, a third resistor, and a third protection switch;

[0059] One end of the third fuse is connected to the third output node, the other end of the third fuse is connected to one end of the third resistor and one end of the third protection switch, and the other end of the third protection switch is respectively connected to the other end of the third resistor, the first selection end of the 3-polarity control switch, and the first selection end of the jth compensation control switch in the third group.

[0060] The beneficial effects of the present invention are as follows: By providing a compensation control structure for a voltage regulator, including: an input node group, an output node group, a compensation transformer group, a compensation control switch group, a polarity control switch group, and a protection circuit group; the input node group is used to connect to an input phase line to obtain an input voltage; the compensation transformer group is used to output a compensation voltage to perform forward compensation or reverse compensation on the input voltage; the compensation control switch group is used to control the input of the compensation voltage to the input voltage; the polarity control switch group is used to control the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage, and when the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage; the output node group is used to output the input voltage after forward compensation or reverse compensation. This compensation control structure realizes the adjustment of the input voltage to obtain the expected output voltage by setting the compensation transformer group, the compensation control switch group, and the polarity control switch group, and controlling the input and polarity change of the compensation transformer group. Description of the Drawings

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, not all embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0062] Figure 1 is the structural framework diagram of the compensation control structure;

[0063] Figure 2 is the circuit schematic diagram of the compensation control structure when accessing a three-phase power supply with a △ connection method;

[0064] Figure 3 is the circuit schematic diagram of the compensation control structure when accessing a three-phase power supply with a Y connection method. Detailed Embodiments

[0065] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention. In addition, all the connection / linkage relationships mentioned in the text do not simply refer to the direct connection of components, but refer to the formation of a more optimal connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present invention can be interactively combined without conflicting with each other.

[0066] Embodiment 1, referring to Figure 1 , a compensation control structure of a voltage regulator is provided, including: an input node group, an output node group, a compensation transformer group, a compensation control switch group and a polarity control switch group;

[0067] The input node group is used to connect to the input phase line to obtain the input voltage;

[0068] The compensation transformer group is used to output a compensation voltage to perform forward compensation or reverse compensation on the input voltage;

[0069] The compensation control switch group is used to control the input of the compensation voltage to the input voltage;

[0070] The polarity control switch group is used to control the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage. When the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage;

[0071] The output node group is used to output the input voltage after forward compensation or reverse compensation.

[0072] When this compensation control structure is working, the input voltage enters this compensation control structure through the input node group. At the same time, this compensation control structure also cooperates with an external control module. The control module obtains the input voltage through the input node group. Of course, the control module can also obtain the input voltage through other channels. The compensation transformer group has already set the corresponding turns ratio. The control module can know the compensating voltage that the compensation transformer group can input through the corresponding turns ratio. Among them, the input of the compensating voltage is determined by the compensation control switch group. For the compensation transformer group, it can be composed of multiple compensation transformers. Of course, the compensation control switch group can also be composed of multiple compensation control switches. The compensation control switches correspond to the compensation transformers one by one. The polarity control switch group controls the polarity of the compensation transformer group. Thus, the polarity of the compensating voltage generated by the compensation transformer group is changed. Thus, it is determined whether to perform forward compensation or reverse compensation on the input voltage. When the polarity of the compensating voltage is the same as that of the input voltage, it is forward compensation for the input voltage. When the polarity of the compensating voltage is opposite, it is reverse compensation for the input voltage.

[0073] When the input voltage is lower than the expected output voltage, forward compensation needs to be performed on the input voltage. Thus, the input voltage and the compensating voltage are superimposed to obtain the expected output voltage. When the input voltage is higher than the expected output voltage, reverse compensation needs to be performed on the input voltage. Thus, partial voltage cancellation is performed between the input voltage and the reverse compensating voltage to obtain the expected output voltage.

[0074] This compensation control structure realizes the adjustment of the input voltage to obtain the expected output voltage by setting the compensation transformer group, the compensation control switch group and the polarity control switch group, and controlling the input and polarity change of the compensation transformer group.

[0075] In some preferred embodiments, this compensation control structure further includes a protection circuit group. The protection circuit group is used to limit the current of the compensation transformer group before the compensation control switch group inputs the compensating voltage to the input voltage. Since the compensation transformer group belongs to an inductive element, if the compensating voltage is directly input, a spark will be generated in the compensation transformer group, causing damage to the compensation transformer group. Therefore, by setting the protection circuit group, the current flowing through the compensation transformer group is limited before the compensating voltage is input to protect the compensation transformer group.

[0076] Reference Figure 2 , to more conveniently illustrate the working principle of this compensation control structure, in some embodiments, this compensation control structure performs compensation control on three-phase electricity with a △ connection. Among them, in this specific embodiment, the compensation transformer group uses three groups of transformers, and each group has three transformers.

[0077] Specifically: the first group's first compensation transformer T1-R, the first group's second compensation transformer T2-R, the first group's third compensation transformer T3-R; the second group's first compensation transformer T1-S, the second group's second compensation transformer T2-S, the second group's third compensation transformer T3-S; the third group's first compensation transformer T1-T, the third group's second compensation transformer T2-T, the third group's third compensation transformer T3-T. For the three-phase electricity with △ connection, the input node group includes: the first input node R, the second input node S, and the third input node T. Among them, the first input node R is connected to the A-phase line, the second input node S is connected to the B-phase line, and the third input node T is connected to the C-phase line.

[0078] The output node group includes: the first output node U, the second output node V, and the third output node W.

[0079] Of course, in order to protect the input nodes, corresponding switches or contactors are connected in series on the first input node R, the second input node S, and the third input node T to perform overall control on the input nodes. In order to protect the output nodes, corresponding switches or contactors are connected in series on the first output node U, the second output node V, and the third output node W to perform overall control on the output nodes.

[0080] The compensation control switch group includes: the first group's first compensation control switch K2-R, the first group's second compensation control switch K3-R, the first group's third compensation control switch K4-R; the second group's first compensation control switch K2-S, the second group's second compensation control switch K3-S, the second group's third compensation control switch K4-S; the third group's first compensation control switch K2-T, the third group's second compensation control switch K3-T, the third group's third compensation control switch K4-T;

[0081] The polarity control switch group includes: the first polarity control switch K1-R, the second polarity control switch K1-S, and the third polarity control switch K1-T;

[0082] The secondary windings of the first group's first compensation transformer T1-R, the first group's second compensation transformer T2-R, and the first group's third compensation transformer T3-R are connected in series to obtain a first winding string. The head tap of the first winding string is connected to the first input node R, and the tail tap of the first winding string is connected to the first output node U;

[0083] The first end tap of the primary winding of the first group's first compensation transformer T1-R, the first end tap of the primary winding of the first group's second compensation transformer T2-R, and the first end tap of the primary winding of the first group's third compensation transformer T3-R are all connected to the fixed end of the first polarity control switch K1-R. The first selection end of the first polarity control switch K1-R is connected to the first output node U through a first protection circuit, and the second selection end of the first polarity control switch K1-R is connected to the second output node V;

[0084] The second end tap of the primary winding of the first group's first compensation transformer T1-R is connected to the fixed end of the first group's first compensation control switch K2-R. The first selection end of the first group's first compensation control switch K2-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's first compensation control switch K2-R is connected to the second output node V;

[0085] The second end tap of the primary winding of the first group's second compensation transformer T2-R is connected to the fixed end of the first group's second compensation control switch K3-R. The first selection end of the first group's second compensation control switch K3-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's second compensation control switch K3-R is connected to the second output node V;

[0086] The second end tap of the primary winding of the first group's third compensation transformer T3-R is connected to the fixed end of the first group's third compensation control switch K4-R. The first selection end of the first group's third compensation control switch K4-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's third compensation control switch K4-R is connected to the second output node V;

[0087] The secondary windings of the second group's first compensation transformer T1-S, the second group's second compensation transformer T2-S, and the second group's third compensation transformer T3-S are connected in series to obtain a second winding string. The first end tap of the second winding string is connected to the second input node S, and the last end tap of the second winding string is connected to the second output node V;

[0088] The first end tap of the primary winding of the second group's first compensation transformer T1-S, the first end tap of the primary winding of the second group's second compensation transformer T2-S, and the first end tap of the primary winding of the second group's third compensation transformer T3-S are all connected to the fixed end of the second polarity control switch K1-S. The first selection end of the second polarity control switch K1-S is connected to the second output node V through a second protection circuit, and the second selection end of the second polarity control switch K1-S is connected to the third output node W;

[0089] The second end tap of the primary winding of the first compensation transformer T1-S of the second group is connected to the fixed end of the first compensation control switch K2-S of the second group. The first selection end of the first compensation control switch K2-S of the second group is connected to the second output node V through a second protection circuit, and the second selection end of the first compensation control switch K2-S of the second group is connected to the third output node W.

[0090] The second end tap of the primary winding of the second compensation transformer T2-S of the second group is connected to the fixed end of the second compensation control switch K3-S of the second group. The first selection end of the second compensation control switch K3-S of the second group is connected to the second output node V through a second protection circuit, and the second selection end of the second compensation control switch K3-S of the second group is connected to the third output node W.

[0091] The second end tap of the primary winding of the third compensation transformer T3-S of the second group is connected to the fixed end of the third compensation control switch K4-S of the second group. The first selection end of the third compensation control switch K4-S of the second group is connected to the second output node V through a second protection circuit, and the second selection end of the third compensation control switch K4-S of the second group is connected to the third output node W.

[0092] The secondary windings of the first compensation transformer T1-T of the third group, the secondary windings of the second compensation transformer T2-T of the third group, and the secondary windings of the third compensation transformer T3-T of the third group are connected in series to obtain a third winding string. The head end tap of the third winding string is connected to the third input node T, and the tail end tap of the second winding string is connected to the third output node W.

[0093] The first end taps of the primary windings of the first compensation transformer T1-T of the third group, the first end taps of the primary windings of the second compensation transformer T2-T of the third group, and the first end taps of the primary windings of the third compensation transformer T3-T of the third group are all connected to the fixed end of the third polarity control switch K1-T. The first selection end of the third polarity control switch K1-T is connected to the third output node W through a third protection circuit, and the second selection end of the third polarity control switch K1-T is connected to the first output node U.

[0094] The second end tap of the primary winding of the first compensation transformer T1-T of the third group is connected to the fixed end of the first compensation control switch K2-T of the third group. The first selection end of the first compensation control switch K2-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the j-th compensation control switch of the third group is connected to the first output node U.

[0095] The second end tap of the primary winding of the second compensation transformer T2-T of the third group is connected to the fixed end of the second compensation control switch K3-T of the third group. The first selection end of the second compensation control switch K3-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the second compensation control switch K3-T of the third group is connected to the first output node U;

[0096] The second end tap of the primary winding of the third compensation transformer T3-T of the third group is connected to the fixed end of the third compensation control switch K4-T of the third group. The first selection end of the third compensation control switch K4-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the third compensation control switch K4-T of the third group is connected to the first output node U.

[0097] Wherein, the first protection circuit includes: a first fuse F1, a first resistor R1 and a first protection switch K5-R;

[0098] One end of the first fuse F1 is connected to the first output node U, the other end of the first fuse F1 is connected to one end of the first resistor R1 and one end of the first protection switch K5-R, and the other end of the first protection switch K5-R is respectively connected to the other end of the first resistor R1, the first selection end of the first polarity control switch K1-R, the first selection end of the first compensation control switch K2-R of the first group, the first selection end of the second compensation control switch K3-R of the first group and the first selection end of the third compensation control switch K4-R of the first group.

[0099] The working principle of the first protection circuit is as follows: When the compensation voltage is not put into operation, at this time, the first resistor R1 is used to limit the current of each compensation transformer in the series-connected compensation transformer group, so that the current value flowing through each compensation transformer is small. By limiting the current of the compensation transformer, when the compensation voltage is put into operation instantaneously, the compensation transformer will not generate too large an induced electromotive force. After the compensation voltage is put into operation, the first protection switch K5-R is closed to short-circuit the first resistor R1, removing the current limitation of the first resistor R1, so that the compensation transformer can work at normal power. For the first fuse F1, it can be disconnected in time when the current flowing through the compensation transformer is too large to protect the compensation transformer.

[0100] The second protection circuit includes: a second fuse F2, a second resistor R2 and a second protection switch K5-S;

[0101] One end of the second fuse F2 is connected to the second output node V. The other end of the second fuse F2 is connected to one end of the second resistor R2 and one end of the second protection switch K5-S. The other end of the second protection switch K5-S is respectively connected to the other end of the second resistor R2, the first selection end of the 2nd polarity control switch K1-S, the first selection end of the first compensation control switch K2-S of the second group, the first selection end of the second compensation control switch K3-S of the second group, and the first selection end of the third compensation control switch K4-S of the second group.

[0102] The working principle of the second protection circuit is as follows: When the compensation voltage is not input, at this time, the second resistor R2 is used to limit the current of each compensation transformer in the series-connected compensation transformer group, so that the current value flowing through each compensation transformer is small. By limiting the current of the compensation transformer, when the compensation voltage is input instantaneously, the compensation transformer will not generate an excessive induced electromotive force. After the compensation voltage is input, the second protection switch K5-S is closed to short-circuit the second resistor R2, eliminating the current limitation of the second resistor R2, so that the compensation transformer can work at normal power. For the second fuse F2, it can be disconnected in time to protect the compensation transformer when the current flowing through the compensation transformer is too large.

[0103] The third protection circuit includes: a third fuse F3, a third resistor R3, and a third protection switch K5-T;

[0104] One end of the third fuse F3 is connected to the third output node W. The other end of the third fuse F3 is connected to one end of the third resistor R3 and one end of the third protection switch K5-T. The other end of the third protection switch K5-T is respectively connected to the other end of the third resistor R3, the first selection end of the 3rd polarity control switch K1-T, the first selection end of the first compensation control switch K2-T of the third group, the first selection end of the second compensation control switch K3-T of the third group, and the first selection end of the third compensation control switch K4-T of the third group.

[0105] The working principle of the third protection circuit is as follows: When the compensation voltage is not input, at this time, the third resistor R3 is used to limit the current of each compensation transformer in the series-connected compensation transformer group, so that the current value flowing through each compensation transformer is small. By limiting the current of the compensation transformer, when the compensation voltage is input instantaneously, the compensation transformer will not generate an excessive induced electromotive force. After the compensation voltage is input, the third protection switch K5-T is closed to short-circuit the third resistor R3, eliminating the current limitation of the third resistor R3, so that the compensation transformer can work at normal power. For the third fuse F3, it can be disconnected in time to protect the compensation transformer when the current flowing through the compensation transformer is too large.

[0106] Assume that the expected output voltage is 220V. Then, when the input voltage changes, the control module will control this compensation control structure as shown in Table 1 below.

[0107] Input voltage K1 K2 K3 K4 K5 ≤192V 0 1 1 1 1 193V - 196V 0 0 1 1 1 197V - 200V 0 1 0 1 1 201V - 204V 0 0 0 1 1 205V - 208V 0 1 1 0 1 209V - 212V 0 0 1 0 1 213V - 216V 0 1 0 0 1 217V - 223V 0 0 0 0 1 224V - 227V 1 0 1 1 1 228V - 231V 1 1 0 1 1 232V - 235V 1 0 0 1 1 236V - 239V 1 1 1 0 1 240V - 243V 1 0 1 0 1 244V - 247V 1 1 0 0 1 ≥248V 1 0 0 0 1

[0108] Table 1;

[0109] In Table 1, K1 represents the set of polarity control switches, K2 represents the set of first compensation control switches, K3 represents the set of second compensation control switches, K4 represents the set of third compensation control switches, and K5 represents the set of protection switches;

[0110] "0" indicates that the fixed terminal of the switch is connected to its first selection terminal, and "1" indicates that the fixed terminal of the switch is connected to its second selection terminal; the switch refers to: polarity control switch, compensation control switch, and protection switch.

[0111] The set of polarity control switches includes: the first polarity control switch K1-R, the second polarity control switch K1-S, and the third polarity control switch K1-T.

[0112] The set of first compensation control switches includes: the first group of first compensation control switches K2-R, the second group of first compensation control switches K2-S, and the third group of first compensation control switches K2-T;

[0113] The set of second compensation control switches includes: the first group of second compensation control switches K3-R, the second group of second compensation control switches K3-S, and the third group of second compensation control switches K3-T;

[0114] The set of third compensation control switches includes: the first group of third compensation control switches K4-R, the second group of third compensation control switches K4-S, and the third group of third compensation control switches K4-T.

[0115] The set of protection switches includes: the first protection switch K5-R, the second protection switch K5-S, and the third protection switch K5-T.

[0116] Through presetting, it is made that:

[0117] The turns ratio of the first group of first compensation transformers T1-R is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the first group of second compensation transformers T2-R is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the first group of third compensation transformers T3-R is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0118] The turns ratio of the first compensating transformer T1-S in the second group is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the second compensating transformer T2-S in the second group is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the third compensating transformer T3-S in the second group is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0119] The turns ratio of the first compensating transformer T1-T in the third group is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the second compensating transformer T2-T in the third group is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the third compensating transformer T3-T in the third group is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0120] Based on the above settings, when the input voltage is 192V, first control K1 to be "0", K2 to be "1", K3 to be "1", and K4 to be "1". Since K5 is a set of protection switches, the protection switches will control K5 only after the control of K1, K2, K3, and K4 is completed, so as to ensure that the current flowing through the compensating transformer bank is restricted before the compensating voltage is input.

[0121] When K1 is "0", it means that the compensating voltage input to the input voltage is positive. Therefore, when K2 is "1", a positive compensating voltage of 3.49V is generated, when K3 is "1", a positive compensating voltage of 6.98V is generated, and when K4 is "1", a positive compensating voltage of 13.96V is generated; thus, by superimposing the input voltage of 192V and the compensating voltage, 216.43V is obtained, and the deviation between the output voltage and the target voltage is only 1.6%, meeting the requirements of the deviation in engineering.

[0122] When the input voltage is 247V, first control K1 to be "1", K2 to be "1", K3 to be "0", and K4 to be "0". Since K5 is a set of protection switches, the protection switches will control K5 only after the control of K1, K2, K3, and K4 is completed, so as to ensure that the current flowing through the compensating transformer bank is restricted before the compensating voltage is input.

[0123] When K1 is "1", it indicates that the input voltage is compensated by a reverse compensating voltage. Therefore, when K2 is "1", no reverse compensating voltage is generated. When K3 is "0", a reverse compensating voltage of 8.9V is generated. When K4 is "0", a reverse compensating voltage of 17.96V is generated. Thus, by partially offsetting the input voltage of 247V with the compensating voltage, we obtain: 220.14V, and the deviation between the output voltage and the target voltage is only 0.06%, meeting the requirements of the engineering deviation.

[0124] The working principles of other cases in Table 1 are as described above and will not be repeated here.

[0125] Reference Figure 3 , in some embodiments, the present compensation control structure performs compensation control on three-phase electricity with a Y connection. Among them, in this specific embodiment, the compensated transformer bank adopts three groups of transformers, and each group has three transformers.

[0126] Specifically: the first group's first compensated transformer T1-R, the first group's second compensated transformer T2-R, the first group's third compensated transformer T3-R; the second group's first compensated transformer T1-S, the second group's second compensated transformer T2-S, the second group's third compensated transformer T3-S; the third group's first compensated transformer T1-T, the third group's second compensated transformer T2-T, the third group's third compensated transformer T3-T. For three-phase electricity with a Y connection, the input node group includes: the first input node R, the second input node S, the third input node T, and the fourth input node N. Among them, the first input node R is connected to the A-phase line, the second input node S is connected to the B-phase line, the third input node T is connected to the C-phase line, and the fourth input node N is connected to the neutral line.

[0127] The output node group includes: the first output node U, the second output node V, the third output node W, and the fourth output node N1.

[0128] The polarity control switch group includes: the first polarity control switch K1-R, the second polarity control switch K1-S, and the third polarity control switch K1-T.

[0129] The first input node R, the second input node S, the third input node T, and the fourth input node N are used to connect three-phase electricity with a Y connection. Among them, the fourth input node N is used to connect to the neutral line.

[0130] Of course, in order to protect the input nodes, corresponding switches or contactors are connected in series on the first input node R, the second input node S, and the third input node T to perform overall control on the input nodes. In order to protect the output nodes, corresponding switches or contactors are connected in series on the first output node U, the second output node V, and the third output node W to perform overall control on the output nodes.

[0131] The compensation control switch group includes: the first group's first compensation control switch K2-R, the first group's second compensation control switch K3-R, and the first group's third compensation control switch K4-R; the second group's first compensation control switch K2-S, the second group's second compensation control switch K3-S, and the second group's third compensation control switch K4-S; the third group's first compensation control switch K2-T, the third group's second compensation control switch K3-T, and the third group's third compensation control switch K4-T;

[0132] The secondary windings of the first group's first compensation transformer T1-R, the first group's second compensation transformer T2-R, and the first group's third compensation transformer T3-R are connected in series to obtain a first winding string. The head tap of the first winding string is connected to the first input node R, and the tail tap of the first winding string is connected to the first output node U;

[0133] The first end taps of the primary windings of the first group's first compensation transformer T1-R, the first group's second compensation transformer T2-R, and the first group's third compensation transformer T3-R are all connected to the fixed end of the first polarity control switch K1-R. The first selection end of the first polarity control switch K1-R is connected to the first output node U through a first protection circuit, and the second selection end of the first polarity control switch K1-R is connected to the fourth output node N1;

[0134] The second end tap of the primary winding of the first group's first compensation transformer T1-R is connected to the fixed end of the first group's first compensation control switch K2-R. The first selection end of the first group's first compensation control switch K2-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's first compensation control switch K2-R is connected to the fourth output node N1;

[0135] The second end tap of the primary winding of the first group's second compensation transformer T2-R is connected to the fixed end of the first group's second compensation control switch K3-R. The first selection end of the first group's second compensation control switch K3-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's second compensation control switch K3-R is connected to the fourth output node N1;

[0136] The second end tap of the primary winding of the first group's third compensation transformer T3-R is connected to the fixed end of the first group's third compensation control switch K4-R. The first selection end of the first group's third compensation control switch K4-R is connected to the first output node U through a first protection circuit, and the second selection end of the first group's third compensation control switch K4-R is connected to the fourth output node N1.

[0137] The secondary windings of the second group's first compensation transformer T1-S, the second group's second compensation transformer T2-S, and the second group's third compensation transformer T3-S are connected in series to obtain a second winding string. The leading tap of the second winding string is connected to the second input node S, and the trailing tap of the second winding string is connected to the second output node V;

[0138] The first end taps of the primary windings of the second group's first compensation transformer T1-S, the second group's second compensation transformer T2-S, and the second group's third compensation transformer T3-S are all connected to the fixed end of the second polarity control switch K1-S. The first selection end of the second polarity control switch K1-S is connected to the second output node V through a second protection circuit, and the second selection end of the second polarity control switch K1-S is connected to the fourth output node N1;

[0139] The second end tap of the primary winding of the second group's first compensation transformer T1-S is connected to the fixed end of the second group's first compensation control switch K2-S. The first selection end of the second group's first compensation control switch K2-S is connected to the second output node V through a second protection circuit, and the second selection end of the second group's first compensation control switch K2-S is connected to the fourth output node N1;

[0140] The second end tap of the primary winding of the second group's second compensation transformer T2-S is connected to the fixed end of the second group's second compensation control switch K3-S. The first selection end of the second group's second compensation control switch K3-S is connected to the second output node V through a second protection circuit, and the second selection end of the second group's second compensation control switch K3-S is connected to the fourth output node N1;

[0141] The second end tap of the primary winding of the second group's third compensation transformer T3-S is connected to the fixed end of the second group's third compensation control switch K4-S. The first selection end of the second group's third compensation control switch K4-S is connected to the second output node V through a second protection circuit, and the second selection end of the second group's third compensation control switch K4-S is connected to the fourth output node N1;

[0142] The secondary windings of the third group's first compensation transformer T1-T, the third group's second compensation transformer T2-T, and the third group's third compensation transformer T3-T are connected in series to obtain a third winding string. The leading tap of the third winding string is connected to the third input node T, and the trailing tap of the second winding string is connected to the third output node W;

[0143] The first end tap of the primary winding of the first compensating transformer T1-T of the third group, the first end tap of the primary winding of the second compensating transformer T2-T of the third group, and the first end tap of the primary winding of the third compensating transformer T3-T of the third group are all connected to the fixed end of the third polarity control switch K1-T. The first selection end of the third polarity control switch K1-T is connected to the third output node W through a third protection circuit, and the second selection end of the third polarity control switch K1-T is connected to the fourth output node N1;

[0144] The second end tap of the primary winding of the first compensating transformer T1-T of the third group is connected to the fixed end of the first compensating control switch K2-T of the third group. The first selection end of the first compensating control switch K2-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the first compensating control switch K2-T of the third group is connected to the fourth output node N1;

[0145] The second end tap of the primary winding of the second compensating transformer T2-T of the third group is connected to the fixed end of the second compensating control switch K3-T of the third group. The first selection end of the second compensating control switch K3-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the second compensating control switch K3-T of the third group is connected to the fourth output node N1;

[0146] The second end tap of the primary winding of the third compensating transformer T3-T of the third group is connected to the fixed end of the third compensating control switch K4-T of the third group. The first selection end of the third compensating control switch K4-T of the third group is connected to the third output node W through a third protection circuit, and the second selection end of the third compensating control switch K4-T of the third group is connected to the fourth output node N1.

[0147] Among them, the first protection circuit includes: a first fuse F1, a first resistor R1, and a first protection switch K5-R;

[0148] One end of the first fuse F1 is connected to the first output node U, the other end of the first fuse F1 is connected to one end of the first resistor R1 and one end of the first protection switch K5-R, and the other end of the first protection switch K5-R is respectively connected to the other end of the first resistor R1, the first selection end of the first polarity control switch K1-R, the first selection end of the first compensating control switch K2-R of the first group, the first selection end of the second compensating control switch K3-R of the first group, and the first selection end of the third compensating control switch K4-R of the first group.

[0149] The working principle of the first protection circuit is as follows: When the compensation voltage is not applied, at this time, the first resistor R1 is used to limit the current of each compensation transformer in the series-connected compensation transformer bank, so that the current value flowing through each compensation transformer is small. By limiting the current of the compensation transformer, it is ensured that when the compensation voltage is applied instantaneously, the compensation transformer will not generate excessive induced electromotive force. After the compensation voltage is applied, the first protection switch K5-R is closed to short-circuit the first resistor R1, eliminating the current limitation of the first resistor R1, so that the compensation transformer can work at normal power. For the first fuse F1, it can be disconnected in time when the current flowing through the compensation transformer is too large to protect the compensation transformer.

[0150] The second protection circuit includes: a second fuse F2, a second resistor R2, and a second protection switch K5-S;

[0151] One end of the second fuse F2 is connected to the second output node V, the other end of the second fuse F2 is connected to one end of the second resistor R2 and one end of the second protection switch K5-S, and the other end of the second protection switch K5-S is respectively connected to the other end of the second resistor R2, the first selection end of the second polarity control switch K1-S, the first selection end of the second group of first compensation control switch K2-S, the first selection end of the second group of second compensation control switch K3-S, and the first selection end of the second group of third compensation control switch K4-S.

[0152] The working principle of the second protection circuit is as follows: When the compensation voltage is not applied, at this time, the second resistor R2 is used to limit the current of each compensation transformer in the series-connected compensation transformer bank, so that the current value flowing through each compensation transformer is small. By limiting the current of the compensation transformer, it is ensured that when the compensation voltage is applied instantaneously, the compensation transformer will not generate excessive induced electromotive force. After the compensation voltage is applied, the second protection switch K5-S is closed to short-circuit the second resistor R2, eliminating the current limitation of the second resistor R2, so that the compensation transformer can work at normal power. For the second fuse F2, it can be disconnected in time when the current flowing through the compensation transformer is too large to protect the compensation transformer.

[0153] The third protection circuit includes: a third fuse F3, a third resistor R3, and a third protection switch K5-T;

[0154] One end of the third fuse F3 is connected to the third output node W. The other end of the third fuse F3 is connected to one end of the third resistor R3 and one end of the third protection switch K5-T. The other end of the third protection switch K5-T is respectively connected to the other end of the third resistor R3, the first selection end of the 3rd polarity control switch K1-T, the first selection end of the first compensation control switch K2-T in the third group, the first selection end of the second compensation control switch K3-T in the third group, and the first selection end of the third compensation control switch K4-T in the third group.

[0155] The working principle of the third protection circuit is as follows: When the compensation voltage is not input, at this time, the third resistor R3 is used to limit the current of each compensation transformer in the series-connected compensation transformer group, so that the current value flowing through each compensation transformer is relatively small. By limiting the current of the compensation transformer, it is ensured that the compensation transformer will not generate an excessive induced electromotive force when the compensation voltage is input instantaneously. After the compensation voltage is input, the third protection switch K5-T is closed to short-circuit the third resistor R3, removing the current limitation of the third resistor R3, so that the compensation transformer can work at normal power. For the third fuse F3, it can be disconnected in time when the current flowing through the compensation transformer is too large to protect the compensation transformer.

[0156] Assume that the expected output voltage is 220V. Then when the input voltage changes, the control module will control this compensation control structure as shown in Table 2 below.

[0157] Input voltage K1 K2 K3 K4 K5 ≤192V 0 1 1 1 1 193V - 196V 0 0 1 1 1 197V - 200V 0 1 0 1 1 201V - 204V 0 0 0 1 1 205V - 208V 0 1 1 0 1 209V - 212V 0 0 1 0 1 213V - 216V 0 1 0 0 1 217V - 223V 0 0 0 0 1 224V - 227V 1 0 1 1 1 228V - 231V 1 1 0 1 1 232V - 235V 1 0 0 1 1 236V - 239V 1 1 1 0 1 240V - 243V 1 0 1 0 1 244V - 247V 1 1 0 0 1 ≥248V 1 0 0 0 1

[0158] Table 2;

[0159] In Table 2, K1 represents the set of polarity control switches, K2 represents the set of the first compensation control switches, K3 represents the set of the second compensation control switches, K4 represents the set of the third compensation control switches, and K5 represents the set of protection switches;

[0160] "0" means that the fixed end of the switch is connected to its first selection end, and "1" means that the fixed end of the switch is connected to its second selection end; the switches refer to: polarity control switches, compensation control switches, and protection switches.

[0161] The set of the polarity control switches includes: the first polarity control switch K1-R, the second polarity control switch K1-S, and the third polarity control switch K1-T.

[0162] The set of the first compensation control switches includes: the first compensation control switch K2-R in the first group, the first compensation control switch K2-S in the second group, and the first compensation control switch K2-T in the third group;

[0163] The set of the second compensation control switches includes: the first group of second compensation control switches K3-R, the second group of second compensation control switches K3-S, and the third group of second compensation control switches K3-T;

[0164] The set of the third compensation control switches includes: the first group of third compensation control switches K4-R, the second group of third compensation control switches K4-S, and the third group of third compensation control switches K4-T.

[0165] The set of the protection switches includes: the first protection switch K5-R, the second protection switch K5-S, and the third protection switch K5-T.

[0166] Through presetting, it is made that:

[0167] The turns ratio of the first group of first compensation transformers T1-R is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the first group of second compensation transformers T2-R is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the first group of third compensation transformers T3-R is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0168] The turns ratio of the second group of first compensation transformers T1-S is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the second group of second compensation transformers T2-S is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the second group of third compensation transformers T3-S is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0169] The turns ratio of the third group of first compensation transformers T1-T is: 220:4; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 4V alternating current; the turns ratio of the third group of second compensation transformers T2-T is: 220:8; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 8V alternating current; the turns ratio of the third group of third compensation transformers T3-T is: 220:16; that is, when 220V alternating current is input to the primary winding, its secondary winding outputs 16V alternating current;

[0170] Based on the above settings, when the input voltage is 192V, first control K1 to be "0", K2 to be "1", K3 to be "1", and K4 to be "1". Since K5 is a set of protection switches, the protection switches will control K5 only after the control of K1, K2, K3, and K4 is completed, so as to limit the current flowing through the compensation transformer bank before applying the compensation voltage.

[0171] When K1 is "0", it means that the compensation voltage applied to the input voltage is positive. Therefore, when K2 is "1", a positive compensation voltage of 3.49V is generated; when K3 is "1", a positive compensation voltage of 6.98V is generated; when K4 is "1", a positive compensation voltage of 13.96V is generated. Thus, by superimposing the input voltage of 192V and the compensation voltage, we get: 216.43V, and the deviation between the output voltage and the target voltage is only 1.6%, which meets the requirements of the deviation in engineering.

[0172] When the input voltage is 247V, first control K1 to be "1", K2 to be "1", K3 to be "0", and K4 to be "0". Since K5 is a set of protection switches, the protection switches will control K5 only after the control of K1, K2, K3, and K4 is completed, so as to limit the current flowing through the compensation transformer bank before applying the compensation voltage.

[0173] When K1 is "1", it means that the compensation voltage applied to the input voltage is negative. Therefore, when K2 is "1", no negative compensation voltage is generated; when K3 is "0", a negative compensation voltage of 8.9V is generated; when K4 is "0", a negative compensation voltage of 17.96V is generated. Thus, by partially offsetting the input voltage of 247V and the compensation voltage, we get: 220.14V, and the deviation between the output voltage and the target voltage is only 0.06%, which meets the requirements of the deviation in engineering.

[0174] The working principles of other cases in Table 2 are as described above and will not be repeated here.

[0175] The above has specifically described the preferred embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A compensation control structure of a voltage regulator, characterized in that, Including: An input node group, an output node group, a compensation transformer group, a compensation control switch group, a polarity control switch group, and a protection circuit group; The input node group is used to connect to the input phase lines to obtain an input voltage; The compensation transformer group is used to output a compensation voltage to perform forward compensation or reverse compensation on the input voltage; The compensation control switch group is used to control the application of the compensation voltage to the input voltage; The polarity control switch group is used to control the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage. When the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage; The output node group is used to output the input voltage after forward compensation or reverse compensation; The protection circuit group is used to limit the current of the compensation transformer group before the compensation control switch group applies the compensation voltage to the input voltage; The protection circuit group includes: a first protection circuit, a second protection circuit, and a third protection circuit; The input node group includes: a first input node, a second input node, and a third input node; The output node group includes: a first output node, a second output node, and a third output node; The first input node, the second input node, and the third input node are used to connect to a three-phase power supply in delta connection; The compensation transformer group includes: the first group of the 1st compensation transformer, the first group of the 2nd compensation transformer,..., the first group of the ith compensation transformer; the second group of the 1st compensation transformer, the second group of the 2nd compensation transformer,..., the second group of the ith compensation transformer; the third group of the 1st compensation transformer, the third group of the 2nd compensation transformer,..., the third group of the ith compensation transformer; The compensation control switch group includes: the first group of the 1st compensation control switch, the first group of the 2nd compensation control switch,..., the first group of the ith compensation control switch; the second group of the 1st compensation control switch, the second group of the 2nd compensation control switch,..., the second group of the ith compensation control switch; the third group of the 1st compensation control switch, the third group of the 2nd compensation control switch,..., the third group of the ith compensation control switch; The polarity control switch group includes: the 1st polarity control switch, the 2nd polarity control switch, and the 3rd polarity control switch; The secondary windings of the first group of the 1st compensation transformer, the secondary windings of the first group of the 2nd compensation transformer,..., the secondary windings of the first group of the ith compensation transformer are connected in series to obtain a first winding string. The leading tap of the first winding string is connected to the first input node, and the trailing tap of the first winding string is connected to the first output node; The first end taps of the primary windings of the first group of the 1st compensation transformer, the first end taps of the primary windings of the first group of the 2nd compensation transformer,..., the first end taps of the primary windings of the first group of the ith compensation transformer are all connected to the fixed end of the 1st polarity control switch. The first selection end of the 1st polarity control switch is connected to the first output node through the first protection circuit, and the second selection end of the 1st polarity control switch is connected to the second output node; The second end tap of the primary winding of the j-th compensation transformer in the first group is connected to the fixed end of the j-th compensation control switch in the first group. The first selection end of the j-th compensation control switch in the first group is connected to the first output node through a first protection circuit, and the second selection end of the j-th compensation control switch in the first group is connected to the second output node; The secondary windings of the first compensation transformer in the second group, the secondary windings of the second compensation transformer in the second group, …, the secondary windings of the i-th compensation transformer in the second group are connected in series to obtain a second winding string. The head end tap of the second winding string is connected to the second input node, and the tail end tap of the second winding string is connected to the second output node; The first end taps of the primary windings of the first compensation transformer in the second group, the first end taps of the primary windings of the second compensation transformer in the second group, …, the first end taps of the primary windings of the i-th compensation transformer in the second group are all connected to the fixed end of the second polarity control switch. The first selection end of the second polarity control switch is connected to the second output node through a second protection circuit, and the second selection end of the second polarity control switch is connected to the third output node; The second end tap of the primary winding of the j-th compensation transformer in the second group is connected to the fixed end of the j-th compensation control switch in the second group. The first selection end of the j-th compensation control switch in the second group is connected to the second output node through a second protection circuit, and the second selection end of the j-th compensation control switch in the second group is connected to the third output node; The secondary windings of the first compensation transformer in the third group, the secondary windings of the second compensation transformer in the third group, …, the secondary windings of the i-th compensation transformer in the third group are connected in series to obtain a third winding string. The head end tap of the third winding string is connected to the third input node, and the tail end tap of the second winding string is connected to the third output node W; The first end taps of the primary windings of the first compensation transformer in the third group, the first end taps of the primary windings of the second compensation transformer in the third group, …, the first end taps of the primary windings of the i-th compensation transformer in the third group are all connected to the fixed end of the third polarity control switch. The first selection end of the third polarity control switch is connected to the third output node through a third protection circuit, and the second selection end of the third polarity control switch is connected to the first output node; The second end tap of the primary winding of the j-th compensation transformer in the third group is connected to the fixed end of the j-th compensation control switch in the third group. The first selection end of the j-th compensation control switch in the third group is connected to the third output node W through a third protection circuit, and the second selection end of the j-th compensation control switch in the third group is connected to the first output node; where i≥2, i is a positive integer, and j = 1, 2, …, i; The first protection circuit includes: a first fuse, a first resistor, and a first protection switch; One end of the first fuse is connected to the first output node, and the other end of the first fuse is connected to one end of the first resistor and one end of the first protection switch. The other end of the first protection switch is respectively connected to the other end of the first resistor, the first selection end of the first polarity control switch, and the first selection end of the first group of the jth compensation control switches; The second protection circuit includes: a second fuse, a second resistor, and a second protection switch; One end of the second fuse is connected to the second output node, and the other end of the second fuse is connected to one end of the second resistor and one end of the second protection switch. The other end of the second protection switch is respectively connected to the other end of the second resistor, the first selection end of the second polarity control switch, and the first selection end of the second group of the jth compensation control switches.

2. The compensation control structure of a voltage regulator according to claim 1, characterized in that The third protection circuit includes: a third fuse, a third resistor, and a third protection switch; One end of the third fuse is connected to the third output node, and the other end of the third fuse is connected to one end of the third resistor and one end of the third protection switch. The other end of the third protection switch is respectively connected to the other end of the third resistor, the first selection end of the third polarity control switch, and the first selection end of the third group of the jth compensation control switches.

3. A compensation control structure of a voltage regulator, characterized in that, Including: An input node group, an output node group, a compensation transformer group, a compensation control switch group, a polarity control switch group, and a protection circuit group; The input node group is used to connect the input phase lines to obtain an input voltage; The compensation transformer group is used to output a compensation voltage to perform forward compensation or reverse compensation on the input voltage; The compensation control switch group is used to control the input of the compensation voltage to the input voltage; The polarity control switch group is used to control the polarity of the compensation voltage. When the polarity of the compensation voltage is the same as that of the input voltage, it is forward compensation for the input voltage. When the polarity of the compensation voltage is opposite, it is reverse compensation for the input voltage; The output node group is used to output the input voltage after forward compensation or reverse compensation; The protection circuit group is used to limit the current of the compensation transformer group before the compensation control switch group inputs the compensation voltage to the input voltage; The protection circuit group includes: a first protection circuit, a second protection circuit, and a third protection circuit; The input node group includes: a first input node, a second input node, a third input node, and a fourth input node; The output node group includes: a first output node, a second output node, a third output node, and a fourth output node; The fourth input node is connected to the fourth output node through a wire; The first input node, the second input node, the third input node, and the fourth input node are used to connect the three-phase electricity in a Y connection. Among them, the fourth input node is used to connect the neutral line; The compensation transformer group includes: the first group of the first compensation transformer, the first group of the second compensation transformer,..., the first group of the ith compensation transformer; the second group of the first compensation transformer, the second group of the second compensation transformer,..., the second group of the ith compensation transformer; the third group of the first compensation transformer, the third group of the second compensation transformer,..., the third group of the ith compensation transformer; The compensation control switch group includes: the first group of the first compensation control switch, the first group of the second compensation control switch, …, the first group of the i-th compensation control switch; the second group of the first compensation control switch, the second group of the second compensation control switch, …, the second group of the i-th compensation control switch; the third group of the first compensation control switch, the third group of the second compensation control switch, …, the third group of the i-th compensation control switch; The polarity control switch group includes: the first polarity control switch, the second polarity control switch, and the third polarity control switch; The secondary windings of the first group of the first compensation transformer, the secondary windings of the first group of the second compensation transformer, …, the secondary windings of the first group of the i-th compensation transformer are connected in series to obtain a first winding string. The head tap of the first winding string is connected to the first input node, and the tail tap of the first winding string is connected to the first output node; The first end taps of the primary windings of the first group of the first compensation transformer, the first end taps of the primary windings of the first group of the second compensation transformer, …, the first end taps of the primary windings of the first group of the i-th compensation transformer are all connected to the fixed end of the first polarity control switch. The first selection end of the first polarity control switch is connected to the first output node through a first protection circuit, and the second selection end of the first polarity control switch is connected to the fourth output node; The second end tap of the primary winding of the first group of the j-th compensation transformer is connected to the fixed end of the first group of the j-th compensation control switch. The first selection end of the first group of the j-th compensation control switch is connected to the first output node through a first protection circuit, and the second selection end of the first group of the j-th compensation control switch is connected to the fourth output node; The secondary windings of the second group of the first compensation transformer, the secondary windings of the second group of the second compensation transformer, …, the secondary windings of the second group of the i-th compensation transformer are connected in series to obtain a second winding string. The head tap of the second winding string is connected to the second input node, and the tail tap of the second winding string is connected to the second output node; The first end taps of the primary windings of the second group of the first compensation transformer, the first end taps of the primary windings of the second group of the second compensation transformer, …, the first end taps of the primary windings of the second group of the i-th compensation transformer are all connected to the fixed end of the second polarity control switch. The first selection end of the second polarity control switch is connected to the second output node through a second protection circuit, and the second selection end of the second polarity control switch is connected to the fourth output node; The second end tap of the primary winding of the second group of the j-th compensation transformer is connected to the fixed end of the second group of the j-th compensation control switch. The first selection end of the second group of the j-th compensation control switch is connected to the second output node through a second protection circuit, and the second selection end of the second group of the j-th compensation control switch is connected to the fourth output node; The secondary windings of the first compensation transformer of the third group, the secondary windings of the second compensation transformer of the third group, …, the secondary windings of the i-th compensation transformer of the third group are connected in series to obtain a third winding string. The head tap of the third winding string is connected to the third input node, and the tail tap of the second winding string is connected to the third output node; The first end taps of the primary windings of the first compensation transformer of the third group, the first end taps of the primary windings of the second compensation transformer of the third group, …, the first end taps of the primary windings of the i-th compensation transformer of the third group are all connected to the fixed end of the 3rd polarity control switch. The first selection end of the 3rd polarity control switch is connected to the third output node through a third protection circuit, and the second selection end of the 3rd polarity control switch is connected to the fourth output node; The second end tap of the primary winding of the j-th compensation transformer of the third group is connected to the fixed end of the j-th compensation control switch of the third group. The first selection end of the j-th compensation control switch of the third group is connected to the third output node through a third protection circuit, and the second selection end of the j-th compensation control switch of the third group is connected to the fourth output node; wherein, i≥2, i is a positive integer, and j = 1, 2, …, i; The first protection circuit includes: a first fuse, a first resistor, and a first protection switch; One end of the first fuse is connected to the first output node. The other end of the first fuse is connected to one end of the first resistor and one end of the first protection switch. The other end of the first protection switch is respectively connected to the other end of the first resistor, the first selection end of the 1st polarity control switch, and the first selection end of the j-th compensation control switch of the first group; The second protection circuit includes: a second fuse, a second resistor, and a second protection switch; One end of the second fuse is connected to the second output node. The other end of the second fuse is connected to one end of the second resistor and one end of the second protection switch. The other end of the second protection switch is respectively connected to the other end of the second resistor, the first selection end of the 2nd polarity control switch, and the first selection end of the j-th compensation control switch of the second group.

4. The compensation control structure of a voltage regulator according to claim 3, characterized in that, The third protection circuit includes: a third fuse, a third resistor, and a third protection switch; One end of the third fuse is connected to the third output node. The other end of the third fuse is connected to one end of the third resistor and one end of the third protection switch. The other end of the third protection switch is respectively connected to the other end of the third resistor, the first selection end of the 3rd polarity control switch, and the first selection end of the j-th compensation control switch of the third group.

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