A power regulator control system and method with transformer load

Abstract

The application relates to a transformer load regulating power controller control system and method, and belongs to the regulating power controller control field. The regulating power controller control system comprises a function selector, a phase modulation mode current calculation module, a cycle mode current calculation module, a first current controller, a second current controller, a first counting controller, a second counting controller, an adaptive trigger angle module and an output trigger module. According to the function selector, the phase modulation mode or the cycle mode is selected. If the phase modulation mode is selected, the signal is processed through the phase modulation mode current calculation module, the first current controller and the first counting controller, and then the control signal is output to the output trigger module. If the cycle mode is selected, the signal is processed through the cycle mode current calculation module, the second current controller, the second counting controller and the adaptive trigger angle module, the output trigger module is controlled, and the control of the thyristor is completed. The application can effectively reduce the excitation inrush current of the transformer and stably control the regulating power controller.

Description

Technical Field

[0001] This invention belongs to the field of power regulator control, and relates to a power regulator control system and method with transformer load. Background Technology

[0002] A power regulator is a device that changes power by controlling the input current and voltage, and it is now widely used in various applications. Different control methods can be selected for different loads. Due to the unique structure of transformers, which differs from other loads, suppressing the inrush current of transformers has become a key technology for power regulator control.

[0003] Existing solutions to transformer load inrush current mainly involve increasing the capacity of the front-end circuit breaker. This method avoids excessive current at the moment of closing by increasing the short-circuit current setting of the circuit breaker. However, this method increases hardware costs and greatly affects the short-circuit protection capability of the load current, thus reducing the protection effect.

[0004] Therefore, in order to meet the characteristics of transformer loads, and without changing the short-circuit protection capability of the front-end circuit breaker, there is an urgent need for a power regulator control method that can control transformer loads without increasing circuit costs. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a power regulator control system and method with transformer load, so as to adapt to different transformer load conditions and ensure stable system operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: Option 1: A power regulator control system with transformer load, the system includes a function selector 100, a phase-shifting mode current calculation module 201, a cycle-shifting mode current calculation module 301, a first current controller 202, a second current controller 302, a first counter 203, a second counter controller 303, an adaptive trigger angle module 304, and an output trigger module 101.

[0007] The function selector 100, the phase-modulation mode current calculation module 201, the first current controller 202, the first counting controller 203, and the output trigger module 101 are connected in sequence; the function selector 100, the cycle mode current calculation module 301, the second current controller 302, the second counting controller 303, the adaptive trigger angle module 304, and the output trigger module 101 are connected in sequence.

[0008] Option 2: A control method for a power regulator with a transformer load, specifically as follows: Select the operating mode of the power regulator using the function selector 100.

[0009] If the phase modulation mode is selected, the effective value of the output current is calculated by the phase modulation mode current calculation module 201. The effective value is subtracted from the current reference value. The difference is input into the first current controller 202 for processing and then output to the first counting controller 203 and the output trigger module 101 respectively. The output trigger module 101 outputs trigger pulses to the thyristor according to the input signal. If the cycle mode is selected, the effective value of the output current is calculated by the cycle mode current calculation module 301. The difference between this effective value and the current reference value is input into the second current controller 302 for processing, and then the output signal is sent to the second counting controller 303. The second counting controller 303 outputs an enable signal. The count value is fed to the adaptive firing angle module 304, which processes the input signal and outputs an enable signal. The trigger angle is sent to the output trigger module 101, and the output trigger module 101 outputs a trigger pulse to the thyristor according to the input signal.

[0010] Furthermore, in phase modulation mode, the effective value of the output current is calculated using the following formula:

[0011] In the formula, Indicates the current period. , and These represent the phase currents of phases A, B, and C, respectively.

[0012] Each time the first counting controller 203 receives an output signal from the first current controller 202, the count value k of the first counting controller 203 increments by 1. When the count value k is less than the count threshold, the first counting controller 203 outputs an enable signal to the output trigger module 101. EN The value is always 1; the enable signal is activated when the count value k is greater than the count threshold. EN It is 0.

[0013] Furthermore, in cycle mode, the effective value of the output current is calculated using the following formula:

[0014] In the formula, express n One current cycle, , and These represent the phase currents of phases A, B, and C, respectively.

[0015] The second current controller 302 processes the input difference to obtain the output enable time T. The ratio of the output enable time T to the operating cycle of the control system is the counting threshold. , n The ratio of the current cycle to the control system operating cycle is the counting threshold. ; Count threshold Assign a value to the counter value and ; Each time the second current controller 302 receives an output signal, the second counter controller 303 outputs an enable signal according to a logic formula. and count value and The logic formula for the adaptive trigger angle module 304 is as follows: .

[0016] The adaptive trigger angle module 304 outputs the trigger angle according to the following formula. To output trigger module 101: .

[0017] The adaptive firing angle module 304 processes the output enable signal. Get enable signal EN and will EN The output is sent to output trigger module 101. The processing method is as follows: When =1, EN =1; When = 0, if ,but EN =1; if ,but EN =0.

[0018] Furthermore, the output trigger module 101 outputs a trigger pulse to the thyristor based on the input signal, specifically: upon receiving the enable signal... EN= At 0, there is no trigger pulse; at enable signal... EN= At time 1, a trigger pulse is output, and the trigger pulse angle is the trigger angle. In phase modulation mode, the firing angle is... The current difference is obtained by processing the first current controller 202.

[0019] The beneficial effects of this invention are as follows: without adding hardware circuits, this invention can effectively reduce the inrush current of the transformer, greatly reduce the current value at the moment of closing, and improve the stability of the system; at the same time, it will not affect the short-circuit current protection of the circuit breaker for the load, thus achieving the purpose of stable control of the power regulator with transformer load.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the power regulator control system of the present invention.

[0022] Figure reference numerals: 100-Function selector, 201-Phase modulation mode current calculation module, 301-Cycle mode current calculation module, 202-First current controller, 302-Second current controller, 203-First counting controller, 303-Second counting controller, 304-Adaptive trigger angle module, 101-Output trigger module. Detailed Implementation

[0023] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] like Figure 1 The diagram shows the structure of the power regulator control system of the present invention. The control system includes a function selector 100, a phase-modulation mode current calculation module 201, a cycle-modulation mode current calculation module 301, a first current controller 202, a second current controller 302, a first counting controller 203, a second counting controller 303, an adaptive firing angle module 304, and an output firing module 101. The function selector 100, phase-modulation mode current calculation module 201, first current controller 202, first counting controller 203, and output firing module 101 are connected in sequence; the function selector 100, cycle-modulation mode current calculation module 301, second current controller 302, second counting controller 303, adaptive firing angle module 304, and output firing module 101 are also connected in sequence.

[0025] The control method of the power regulator control system of this invention is as follows: The function mode can be selected by the function selector 100, which includes two modes: phase modulation mode and frequency mode. The function selector 100 will select a unique function mode.

[0026] I. Phase modulation mode In phase modulation mode, the three-phase currents of A, B, and C , and In one current cycle T base The effective value of the output current is calculated using the following formula: ; Calculated effective value of current I Compared with the system-set current reference value i The difference in current is input to the first current controller 202, which processes the input current difference to obtain the firing angle through proportional-integral control. And output to the output trigger module 101.

[0027] The counting threshold of the first counter controller 203 is the ratio of the current cycle to the operating cycle of the control system. Each time an input signal enters the first counter controller 203, its count value k increments by one. If the count value is less than the counting threshold, the first counter controller 203 outputs an enable signal. EN The value is always 1. When the value is greater than the counting threshold, the enable signal is 0, and the enable signal is output to the output trigger module 101.

[0028] The output trigger module 101 receives the trigger angle signal output by the first current controller 202 and the enable signal output by the first counter controller 203. Upon receiving the enable signal... EN= At 0, there is no trigger pulse; at enable signal... EN= At time 1, a trigger pulse is output, and the trigger pulse angle is the trigger angle. .

[0029] II. Zhoubo Mode Three-phase currents A, B, and C , and exist n One cycle T base The effective value of the output current is calculated using the following formula:

[0030] Calculated effective value of current I Compared with the system-set current reference value i The difference in current is output to the second current controller 302. The second current controller 302 processes the input current difference through proportional-integral control to obtain the output enable time T.

[0031] The ratio of the output enable time T to the operating cycle of the control system is used as the counting threshold. , n The ratio of the current cycle to the operating cycle of the control system is used as the counting threshold. , count threshold Assign to and Each time an input signal enters the second counter controller 303, if ,but Decrement by 1 until... ,when When it is 0, Change from 1 to 0; When it is 0, Increment by 1 until... , Then change from 0 to 1. This is the total frequency count threshold. The logical formula is:

[0032] Enable signal and count value and The output is given to the adaptive firing angle module 304, in the enable signal. When the angle changes from 0 to 1, the trigger angle of the adaptive trigger angle module is... ， when When =1, ， =0 ， The logical calculation formula is:

[0033] The adaptive firing angle module 304 will input the enable signal. The process is performed to obtain a new enable signal EN: When =1, EN =1; in When = 0, if , EN =1, if , EN =0. Output a new enable signal EN to the output trigger module 101.

[0034] The output trigger module 101 receives the enable signal. EN and trigger angle Then, a trigger pulse is output to the thyristor. EN When =0, there is no trigger pulse; EN When =1, the trigger pulse angle is .

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control method for a power regulator with a transformer load, characterized in that: Select the operating mode of the power regulator using the function selector (100); If phase modulation mode is selected, the effective value of the output current is calculated by the phase modulation mode current calculation module (201). The difference between this effective value and the current reference value is input into the first current controller (202) for processing to obtain the firing angle. Then, the outputs are sent to the first counting controller (203) and the output trigger module (101) respectively. The output trigger module (101) determines the trigger angle based on the output of the first current controller (202). The enable signal output by the first counting controller (203) triggers a trigger pulse to the thyristor. If the cycle mode is selected, the effective value of the output current is calculated by the cycle mode current calculation module (301). The difference between the effective value and the current reference value is input into the second current controller (302) for processing to obtain the output enable time T, and then output to the second counting controller (303). The ratio of the output enable time T to the operating cycle of the control system is the counting threshold. , n The ratio of the current cycle to the control system operating cycle is the counting threshold. Count threshold Assign a value to the counter value and Each time the output signal of the second current controller (302) is received, the second counting controller (303) outputs an enable signal according to the following logic. and count value and The logic for the adaptive trigger angle module (304) is as follows: like ,but Decrement by 1 until... ,when When it is 0, Change from 1 to 0; When it is 0, Increment by 1 until... , Then change from 0 to 1; The adaptive firing angle module (304) outputs the firing angle. The output logic of the output trigger module (101) is as follows: when the enable signal is activated... When the angle changes from 0 to 1, the firing angle of the adaptive firing angle module (304) is... ， when When =1, ， =0 ; The adaptive firing angle module (304) processes the enable signal. Get enable signal and will The output is sent to the output trigger module (101), and the processing method is as follows: When =1, EN =1; When = 0, if ,but EN =1; if ,but EN =0; The output trigger module (101) outputs a trigger pulse to the thyristor according to the input signal, specifically: upon receiving the enable signal... EN= At 0, there is no trigger pulse; at enable signal... EN= At time 1, a trigger pulse is output, and the trigger pulse angle is the trigger angle. .

2. The control method according to claim 1, characterized in that: In the phase modulation mode, the effective value of the output current is calculated using the following formula: In the formula, Indicates the current period. , and These represent the phase currents of phases A, B, and C, respectively.

3. The control method according to claim 1, characterized in that: In the phase modulation mode, each time the first counting controller (203) receives the output signal from the first current controller (202), the count value k of the first counting controller (203) increments by 1; When the count value k is less than the count threshold, the first counting controller (203) outputs an enable signal to the output trigger module (101). EN The value is 1; the enable signal is activated when the count value k is greater than the count threshold. EN It is 0.

4. The control method according to claim 1, characterized in that: In the stated cycle mode, the effective value of the output current is calculated using the following formula: In the formula, express n One current cycle, , and These represent the phase currents of phases A, B, and C, respectively.

5. A power regulator control system with a transformer load for use in conjunction with the method of any one of claims 1 to 4, characterized in that: The system includes a function selector (100), a phase-modulation mode current calculation module (201), a cycle-mode current calculation module (301), a first current controller (202), a second current controller (302), a first counting controller (203), a second counting controller (303), an adaptive firing angle module (304), and an output firing module (101). The function selector (100), the phase modulation mode current calculation module (201), the first current controller (202), the first counting controller (203), and the output trigger module (101) are connected in sequence; The function selector (100), the cycle mode current calculation module (301), the second current controller (302), the second counting controller (303), the adaptive trigger angle module (304), and the output trigger module (101) are connected in sequence.

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