Power supply disturbance suppression method and system for motor driving mechanism of high-voltage circuit breaker

Abstract

The invention discloses a disturbance suppression method and system for a power supply of a motor driving mechanism of a high-voltage circuit breaker to stabilize the power supply voltage of the motor driving mechanism in the high-voltage circuit breaker. A bus regulator is connected in parallel to a capacitor bank on the power supply side of the motor driving mechanism of the high-voltage circuit breaker, and a power supply bus regulator model of the motor driving mechanism of the high-voltage circuit breaker is established; based on the high-voltage circuit breaker motor driving mechanism power supply bus regulator model, constructing a state variable and solving a state equation; selecting a non-singular fast terminal sliding mode surface of the bus regulator according to the state equation, limiting parameters of the non-singular fast terminal sliding mode surface of the bus regulator by using a stability theorem, and eliminating voltage fluctuation of a power supply caused by loading and unloading of a motor driving mechanism of the high-voltage circuit breaker. Therefore, stable operation of the motor driving mechanism of the high-voltage circuit breaker is ensured, and reliable opening or closing operation of the high-voltage circuit breaker is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switchgear research, and in particular to a method and system for suppressing disturbance of power supply of a motor drive mechanism of a high-voltage circuit breaker. Background Art

[0002] As a key primary device in the power system, the motor drive mechanism of the high-voltage circuit breaker bears the important responsibility for the safe and stable operation of the power system. When the high-voltage circuit breaker performs the opening or closing operation, its motor drive mechanism needs to release a large amount of energy instantly, which will cause a large disturbance in the power supply, which will not only affect the operating stability of the motor drive mechanism itself, but also may cause the high-voltage circuit breaker moving contact to fail to open or close accurately, thereby affecting the normal operation of the power system. Therefore, how to effectively suppress these disturbances and ensure the normal operation of the motor drive mechanism has become an urgent problem to be solved.

[0003] The traditional method is to connect a large-capacity capacitor in parallel between the power supply and the motor drive mechanism. The large capacitor can absorb instantaneous current spikes and smooth the power supply voltage, thereby reducing the impact on the power supply when the motor starts. However, relying solely on parallel large capacitors is an uncontrolled passive processing method. It can only alleviate some disturbance problems, but cannot fundamentally solve the impact of power supply disturbances during motor driving. Especially in the context of increasingly complex power systems, a single large-capacitor compensation strategy is difficult to meet the increasingly high stability and reliability requirements.

[0004] With the development of power electronics and intelligent control technologies, more active disturbance suppression methods have emerged. For example, advanced technologies such as filters with intelligent control, dynamic voltage restorers (DVRs) or uninterruptible power supplies (UPSs) can be used to enhance the stability of the power supply. These methods can not only effectively absorb transient currents, but also actively adjust the output voltage to maintain the stability of the power supply, thereby further improving the working reliability of the high-voltage circuit breaker motor drive mechanism.

[0005] In view of the limitations of traditional methods, it is particularly necessary to develop a new method and system for suppressing power supply disturbances in the motor drive mechanism of high-voltage circuit breakers. The new method should be able to combine advanced power electronic devices with intelligent control strategies to achieve active and precise control of power supply disturbances, thereby ensuring the reliable operation of high-voltage circuit breakers under various working conditions. Summary of the invention

[0006] In view of the above existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method and system for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism, the purpose of which is to prevent the disturbances in the power supply from affecting the stability of the operation of the motor drive mechanism by suppressing disturbances generated in the power supply of the motor drive mechanism when the motor drive mechanism is running.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] In a first aspect, the present invention provides a method for suppressing disturbances in a power supply of a high-voltage circuit breaker motor drive mechanism, comprising: connecting a bus regulator in parallel to a capacitor group on the power supply side of the high-voltage circuit breaker motor drive mechanism, and establishing a bus regulator model for the power supply of the high-voltage circuit breaker motor drive mechanism; constructing state variables and obtaining state equations based on the bus regulator model for the power supply of the high-voltage circuit breaker motor drive mechanism; selecting a non-singular fast terminal sliding surface of the bus regulator according to the state equation, and using a stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the bus regulator to achieve disturbance suppression of the high-voltage circuit breaker motor drive mechanism.

[0010] As a preferred solution of the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to the present invention, the step of establishing a bus regulator model for power supply of a high-voltage circuit breaker motor drive mechanism comprises:

[0011] A busbar regulator is connected in parallel to a capacitor bank on the power supply side of a high-voltage circuit breaker motor drive mechanism, and if the busbar regulator is in a working state of releasing energy to the busbar, the direction of the current flowing from the busbar regulator into the power supply of the high-voltage circuit breaker motor drive mechanism is opposite to that in a working state of absorbing energy from the busbar;

[0012] The power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism is established, and the formula is expressed as follows:

[0013]

[0014] Among them, u BR is the voltage across the bus regulator equivalent capacitor, i BR The current flowing into the power supply of the high-voltage circuit breaker motor drive mechanism for the busbar regulator, R BR is the resistance of the bus regulator, C BR is the equivalent capacitance of the bus regulator, L BR is the filter inductance of the bus regulator, u Bus The current bus voltage that supplies power to the motor drive mechanism of a high voltage circuit breaker.

[0015] As a preferred solution of the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to the present invention, the construction of state variables and obtaining state equations include:

[0016] The current bus voltage of the high-voltage circuit breaker motor drive mechanism power supply, the voltage across the bus regulator equivalent capacitor, and the current flowing from the bus regulator into the high-voltage circuit breaker motor drive mechanism power supply are measured, and state variables x1 and x2 are constructed according to the measured values, which are expressed as:

[0017]

[0018] The state equation of the bus regulator is obtained as follows:

[0019]

[0020] Among them, τ is the adjustment coefficient.

[0021] As a preferred solution of the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to the present invention, wherein: selecting a non-singular fast terminal sliding surface of a bus regulator according to the state variables x1, x2 and the state equation comprises:

[0022]

[0023] Among them, s NSMC is a non-singular fast terminal sliding surface, d1 and d2 are coefficients of the non-singular fast terminal sliding surface, p and q are both positive odd numbers, and p <q。

[0024] As a preferred solution of the method for suppressing disturbance of power supply of the motor drive mechanism of the high-voltage circuit breaker of the present invention, the time t of the non-singular fast terminal sliding mode surface of the bus regulator to reach the equilibrium point is: G for:

[0025]

[0026] As the initial state equilibrium point of the state variable x1 is closer, the time when the non-singular fast terminal sliding mode surface of the busbar regulator reaches the equilibrium point is faster, that is, the time t G When it reaches 0, it reaches the equilibrium point.

[0027] As a preferred solution of the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to the present invention, the parameters of the non-singular fast terminal sliding surface of the bus regulator defined by the stability theorem include:

[0028] When NSMC >0, τ=1, and then:

[0029]

[0030] As a preferred solution of the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to the present invention, the method of limiting the parameters of the non-singular fast terminal sliding surface of the bus regulator by using the stability theorem also includes:

[0031] When NSMC <0, τ=0, and then:

[0032]

[0033] In a second aspect, the present invention provides a system for suppressing disturbances in a power supply of a high-voltage circuit breaker motor drive mechanism, comprising:

[0034] A model building module is used to connect the bus regulator in parallel with the capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker to establish a bus regulator model of the power supply of the motor drive mechanism of the high-voltage circuit breaker;

[0035] A calculation module is used to construct state variables and obtain state equations based on the power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism;

[0036] The disturbance suppression module is used to select a non-singular fast terminal sliding surface of the bus regulator according to the state equation, and use the stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the bus regulator to achieve disturbance suppression of the high-voltage circuit breaker motor drive mechanism.

[0037] In a third aspect, the present invention provides a computing device, comprising:

[0038] Memory and processor;

[0039] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method are implemented.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which implement the steps of the method when executed by a processor.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a power supply disturbance suppression technology for a motor drive mechanism of a high-voltage circuit breaker to stabilize the power supply voltage of the motor drive mechanism in the high-voltage circuit breaker. The method manages a bus regulator in parallel with a capacitor group on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, and reasonably adjusts the filtering characteristics and damping characteristics exhibited by the bus regulator through a non-singular fast terminal sliding mode algorithm, thereby eliminating power supply voltage fluctuations caused by loading and unloading of the motor drive mechanism of the high-voltage circuit breaker, thereby ensuring the stable operation of the motor drive mechanism of the high-voltage circuit breaker and realizing reliable opening or closing operations of the high-voltage circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0043] Figure 1 It is an overall flow chart of a method for suppressing power supply disturbance of a motor drive mechanism of a high-voltage circuit breaker according to an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of a high-voltage circuit breaker motor drive mechanism after adding a busbar regulator in a method for suppressing power supply disturbance of a high-voltage circuit breaker motor drive mechanism according to an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of an equivalent circuit of a busbar regulator of a method for suppressing power supply disturbance of a motor drive mechanism of a high-voltage circuit breaker according to an embodiment of the present invention;

[0046] Figure 4 This is a comparison diagram of the change curves of bus voltage and current when loading before and after adding a bus regulator in a method for suppressing power supply disturbance of a high-voltage circuit breaker motor drive mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0048] Example 1

[0049] Reference Figure 1 to Figure 3As one embodiment of the present invention, a method for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism is provided, which suppresses disturbances in the power supply of the motor drive mechanism during operation, thereby preventing the disturbances in the power supply from affecting the stability of the operation of the motor drive mechanism. Figure 1 The specific steps shown include:

[0050] S100: Connecting the bus regulator in parallel to the capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, and establishing a bus regulator model of the power supply of the motor drive mechanism of the high-voltage circuit breaker;

[0051] S200: constructing state variables and obtaining state equations based on a power supply bus regulator model of a high-voltage circuit breaker motor drive mechanism;

[0052] S300: Select the non-singular fast terminal sliding surface of the busbar regulator according to the state equation;

[0053] S400: Using the stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the busbar regulator, the disturbance suppression of the motor drive mechanism of the high-voltage circuit breaker is achieved;

[0054] It should be noted that, in this embodiment, the bus regulator manages the capacitor group connected in parallel on the power supply side of the high-voltage circuit breaker motor drive mechanism, and reasonably adjusts the filtering characteristics and damping characteristics exhibited by the bus regulator through a non-singular fast terminal sliding mode algorithm, thereby eliminating the power supply voltage fluctuations caused by loading and unloading of the high-voltage circuit breaker motor drive mechanism, thereby ensuring the stable operation of the high-voltage circuit breaker motor drive mechanism.

[0055] It should be noted that, in the implementation scheme of the present application, a non-singular fast terminal sliding mode controller design method is proposed to address the characteristics of poor transient and steady-state performance of traditional sliding mode control methods used for bus regulators. The implementation of this method can enable the bus regulator system to reach the equilibrium point faster and improve the voltage stability and transient performance of the power supply of the high-voltage circuit breaker motor drive mechanism.

[0056] In the embodiment of the present application, the above step S100 includes the following sub-steps A1 and A2;

[0057] In A1: the busbar regulator is connected in parallel to the capacitor bank on the power supply side of the high-voltage circuit breaker motor drive mechanism. If the busbar regulator is in a working state of releasing energy to the busbar, the direction of the current flowing from the busbar regulator into the power supply of the high-voltage circuit breaker motor drive mechanism is opposite to that in the working state of absorbing energy from the busbar;

[0058] Exemplarily, the busbar regulator is connected in parallel to a capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, wherein the capacitor bank is composed of 48 strings of 3V 1200F monomers, 48 ​​monomers form a 144V 25F supercapacitor module, and then 6 strings of 144V 25F modules form a 780V 4.1F supercapacitor system;

[0059] In an optional embodiment, assuming that the busbar regulator switches K1, K2, K3, and K4 are in a state of absorbing energy from the busbar, the Figure 2 The schematic diagram of the model of the bus regulator for the power supply of the high-voltage circuit breaker motor drive mechanism is shown in the figure, where K1, K2, K3, and K4 are control switches that control the bus regulator capacitor bank to provide or absorb energy to the high-voltage circuit breaker motor drive mechanism. These switches are provided with drive signals by the bus regulator control unit, and these drive signals are produced by the non-singular fast terminal sliding mode control algorithm. The power of the high-voltage circuit breaker motor drive mechanism is very large, and a large capacitor capacity is required to store energy. These capacitors are represented by equivalent capacitors C BR The voltage across the equivalent capacitor is represented by u BR In addition, R BR is the resistance of the bus regulator, L BR is the filter inductance of the bus regulator, i BR The current flowing into the power supply of the high-voltage circuit breaker motor drive mechanism for the busbar regulator, i Load is the current flowing into the motor drive mechanism of the high-voltage circuit breaker, u Bus The bus voltage of the power supply for the motor drive mechanism of the high-voltage circuit breaker, i Bus It is the bus current of the power supply. If the bus regulator is in the working state of releasing energy to the bus, the direction of the current flowing from the bus regulator into the power supply of the high-voltage circuit breaker motor drive mechanism is opposite to that in the working state of absorbing energy from the bus.

[0060] In A2, according to Figure 3 The power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism is established, and the formula is expressed as follows:

[0061]

[0062] Among them, u BR is the voltage across the bus regulator equivalent capacitor, i BR The current flowing into the power supply of the high-voltage circuit breaker motor drive mechanism for the busbar regulator, R BR is the resistance of the bus regulator, C BR is the equivalent capacitance of the bus regulator, L BR is the filter inductance of the bus regulator, u Bus The current bus voltage that supplies power to the motor drive mechanism of a high voltage circuit breaker.

[0063] In the embodiment of the present application, the above step S200 includes the following sub-steps B1 and B2;

[0064] In B1, measure the current bus voltage u of the power supply of the high-voltage circuit breaker motor drive mechanism Bus , the voltage u across the bus regulator equivalent capacitor BR and the current i flowing from the busbar regulator into the power supply of the high-voltage circuit breaker motor drive mechanism BR , construct state variables x1 and x2 according to the measured values, expressed as:

[0065]

[0066] In B2, the state equation of the bus regulator is obtained based on the constructed state variables x1 and x2:

[0067]

[0068] Among them, τ is the adjustment coefficient.

[0069] Before introducing step S300 of the embodiment of the present application, it is necessary to introduce the existing non-singular fast terminal sliding surface, as follows:

[0070] For nonlinear systems:

[0071]

[0072] Where x = [x1 x2] Τ represents the state variable in the nonlinear system, u represents the input, f(x) and b(x) are known functions of the system, g(x) is the sum of all unknown disturbances in the system, and to keep the system stable, g(x) is bounded, g(x)≤θ m ;

[0073] The general linear sliding surface can be defined as s(x)=cx1+x2, where c is the sliding coefficient of the linear sliding mode, satisfying c>0;

[0074] Taking the derivative of x1 we get:

[0075]

[0076] Let y = In(x1), we get:

[0077]

[0078] Integrating both sides gives:

[0079]

[0080] Among them, y(0) is its initial state;

[0081] When the state error is 0, that is, x1 = 0, y = ∞, let the required time be t s , we can get:

[0082]

[0083] Therefore, the linear sliding mode is asymptotically stable and the time to reach the equilibrium point is infinite, which is also the reason for its poor rapidity.

[0084] In an optional embodiment, the following non-singular fast terminal sliding surface is used:

[0085] s NSMC (x)=x1+|d1x2| p / q sign(x2)+d2|x1| 3

[0086] Among them, s NSMC is a non-singular fast terminal sliding surface, d1 and d2 are coefficients of the non-singular fast terminal sliding surface, p and q are both positive odd numbers, and p <q;

[0087] When the nonlinear system moves from the initial state s(0) which is not zero to the sliding surface s NSMC = 0, there exists:

[0088]

[0089] Since p and q are both odd numbers, the above formula can be rewritten as:

[0090]

[0091] Simplified:

[0092]

[0093] At the same time, the expression for x2 is written as:

[0094]

[0095] Then the time for the non-singular fast terminal sliding mode to reach the equilibrium point is t G :

[0096]

[0097] As the initial state equilibrium point of x1 is closer, the time for the non-singular fast terminal sliding mode to reach the equilibrium point will be faster, q>p, so the final t G is 0, so it can reach the equilibrium point.

[0098] In the embodiment of the present application, the above step S300 includes the following sub-steps C1 and C2;

[0099] In C1, the non-singular fast terminal sliding surface of the busbar regulator is selected according to the state variables x1, x2 and the state equation, including:

[0100]

[0101] Among them, s NSMC is a non-singular fast terminal sliding surface, d1 and d2 are coefficients of the non-singular fast terminal sliding surface, p and q are both positive odd numbers, and p <q。

[0102] In C2, the time t when the non-singular fast terminal sliding surface of the busbar regulator reaches the equilibrium point G for:

[0103]

[0104] Specifically, as the initial state equilibrium point of the state variable x1 is closer, the time for the bus regulator non-singular fast terminal sliding surface to reach the equilibrium point is faster, that is, the time t G When it reaches 0, it reaches the equilibrium point.

[0105] It should be noted that, since the linear sliding mode converges gradually, the convergence time is infinite, which is also the reason why the linear sliding mode has weak anti-interference ability. In order to improve the steady-state ability of the sliding mode control in the phase-shifted full-bridge, it is usually adopted to increase the order of system control and improve the robustness by controlling the error integral. However, the full-order sliding mode control increases the complexity of the peripheral circuit, so the nonlinear sliding mode should be selected to replace the traditional linear sliding mode surface. Using non-singular sliding mode control, by changing the base of the power function, the non-singular phenomenon of the terminal sliding mode is cleverly solved. To this end, this embodiment proposes a non-singular fast terminal sliding mode, and replaces the traditional linear sliding mode control in the control process of the bus regulator of the power supply of the high-voltage circuit breaker motor drive mechanism. In the implementation scheme of the present application, the bus regulator adopts a non-singular fast terminal sliding mode controller design method. The implementation of this method can enable the bus regulator system to reach the equilibrium point faster and improve the voltage stability and transient performance of the power supply of the high-voltage circuit breaker motor drive mechanism. The results show that this method can diagnose mechanical and electrical gradual faults in the motor drive mechanism of high-voltage circuit breaker and improve the safety and reliability of the operation of the motor drive mechanism of high-voltage circuit breaker.

[0106] In the embodiment of the present application, the above step S400 includes the following sub-steps D1 and D2;

[0107] According to the function of the non-singular fast terminal sliding surface of the busbar regulator, in order to ensure that the non-singular sliding surface of the busbar regulator can operate stably, it is necessary to limit the sliding surface parameters and derive the non-singular fast terminal sliding surface of the busbar regulator:

[0108]

[0109] According to the Lyapunov stability theorem, the Lyapunov function is selected as:

[0110]

[0111] In order to maintain stability, the following conditions must be met:

[0112]

[0113] In D1, when s NSMC >0, τ=1, and then:

[0114]

[0115] In D2, when s NSMC <0, τ=0, and then:

[0116]

[0117] It should be noted that the selection of sliding surface parameters of non-singular fast terminal sliding mode must meet the above conditions.

[0118] From the above, it can be seen that the present invention provides a power supply disturbance suppression technology for a motor drive mechanism of a high-voltage circuit breaker to stabilize the power supply voltage of the motor drive mechanism in the high-voltage circuit breaker. The method manages the bus regulator in parallel with the capacitor group on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, and reasonably adjusts the filtering characteristics and damping characteristics exhibited by the bus regulator through a non-singular fast terminal sliding mode algorithm to eliminate the power supply voltage fluctuation caused by the loading and unloading of the motor drive mechanism of the high-voltage circuit breaker, thereby ensuring the stable operation of the motor drive mechanism of the high-voltage circuit breaker and realizing the reliable opening or closing operation of the high-voltage circuit breaker.

[0119] The above is a schematic scheme of a method for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism in this embodiment. It should be noted that the technical scheme of the system for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism and the technical scheme of the method for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism described above belong to the same concept. For details not described in detail in the technical scheme of the system for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism in this embodiment, please refer to the description of the technical scheme of the method for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism described above.

[0120] This embodiment also provides a high-voltage circuit breaker motor drive mechanism power supply disturbance suppression system, including a model building module, a calculation module and a disturbance suppression module;

[0121] Specifically, the model building module is used to connect the bus regulator in parallel with the capacitor bank on the power supply side of the high-voltage circuit breaker motor drive mechanism to establish a bus regulator model for the power supply of the high-voltage circuit breaker motor drive mechanism;

[0122] Specifically, the calculation module is used to construct state variables and obtain state equations based on a power supply bus regulator model of a high-voltage circuit breaker motor drive mechanism;

[0123] Specifically, the disturbance suppression module is used to select the non-singular fast terminal sliding surface of the bus regulator according to the state equation, and use the stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the bus regulator to achieve disturbance suppression of the high-voltage circuit breaker motor drive mechanism.

[0124] The above-mentioned unit modules may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above-mentioned modules.

[0125] This embodiment also provides a computing device, which includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for suppressing disturbances in the power supply of a high-voltage circuit breaker motor drive mechanism is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0126] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method proposed in the above embodiment is implemented.

[0127] The storage medium proposed in this embodiment and the method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0128] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0129] Example 2

[0130] Reference Figures 2 to 4 Based on the previous embodiment, this embodiment provides an application example of a method and system for suppressing power supply disturbance of a high-voltage circuit breaker motor drive mechanism, in order to verify and illustrate the technical effects adopted in this method.

[0131] In this embodiment, the bus regulator is connected in parallel to the capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, wherein the capacitor bank is composed of 48 strings of 3V 1200F monomers, 48 ​​monomers form a 144V 25F supercapacitor module, and then 6 strings of 144V25F modules form a 780V 4.1F supercapacitor system; assuming that the bus regulator switches K1, K2, K3, and K4 are in the working state of absorbing energy from the bus, obtain the energy based on Figure 2 The model schematic diagram of the power supply bus regulator of the high-voltage circuit breaker motor drive mechanism shown in the figure is based on Figure 3 Establish a power supply bus regulator model for the motor drive mechanism of the high-voltage circuit breaker;

[0132] Measure the current bus voltage u of the power supply of the motor drive mechanism of the high-voltage circuit breaker Bus , the voltage u across the bus regulator equivalent capacitor BR and the current i flowing from the busbar regulator into the power supply of the high-voltage circuit breaker motor drive mechanism BR, construct state variables x1 and x2 according to the measured values, and obtain the state equation; select the non-singular fast terminal sliding surface of the bus regulator according to the state equation, and use the stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the bus regulator to achieve disturbance suppression of the motor drive mechanism of the high-voltage circuit breaker.

[0133] In this embodiment, the large signal stability analysis of the system under load changes is performed in two cases: adding a bus regulator (BR) and without a BR. The results are as follows: Figure 4 As shown. Figure 4 It can be seen that after adding BR, the voltage and current changes of the power supply bus are smoother than before, thereby reducing the disturbance to the bus when a large load is loaded.

[0134] Therefore, the method and system for suppressing disturbances in the power supply of the motor drive mechanism of a high-voltage circuit breaker proposed in the present application can significantly reduce the amplitude of disturbances to the power supply of the motor drive mechanism caused by the load, filter out the oscillation of the bus voltage, and thus ensure the stable operation of the motor drive mechanism of the high-voltage circuit breaker.

[0135] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0136] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0137] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0138] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0139] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0140] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0141] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for suppressing disturbances in power supply of a high-voltage circuit breaker motor drive mechanism, characterized in that: include: The bus regulator is connected in parallel to the capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker, and a bus regulator model of the power supply of the motor drive mechanism of the high-voltage circuit breaker is established; Constructing state variables and obtaining state equations based on the power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism; A non-singular fast terminal sliding surface of a busbar regulator is selected according to the state equation, and the parameters of the non-singular fast terminal sliding surface of the busbar regulator are limited by using the stability theorem to achieve disturbance suppression of a motor drive mechanism of a high-voltage circuit breaker.

2. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 1, characterized in that: The establishment of a high-voltage circuit breaker motor drive mechanism power supply bus regulator model comprises: A busbar regulator is connected in parallel to a capacitor bank on the power supply side of a high-voltage circuit breaker motor drive mechanism, and if the busbar regulator is in a working state of releasing energy to the busbar, the direction of the current flowing from the busbar regulator into the power supply of the high-voltage circuit breaker motor drive mechanism is opposite to that in a working state of absorbing energy from the busbar; The power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism is established, and the formula is expressed as follows: Among them, u BR is the voltage across the bus regulator equivalent capacitor, i BR The current flowing into the power supply of the high-voltage circuit breaker motor drive mechanism for the busbar regulator, R BR is the resistance of the bus regulator, C BR is the equivalent capacitance of the bus regulator, L BR is the filter inductance of the busbar regulator, u Bus The current bus voltage that supplies power to the motor drive mechanism of a high voltage circuit breaker.

3. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 2, characterized in that: The constructing of state variables and obtaining state equations comprises: The current bus voltage of the high-voltage circuit breaker motor drive mechanism power supply, the voltage across the bus regulator equivalent capacitor, and the current flowing from the bus regulator into the high-voltage circuit breaker motor drive mechanism power supply are measured, and state variables x1 and x2 are constructed according to the measured values, which are expressed as: The state equation of the bus regulator is obtained as follows: Among them, τ is the adjustment coefficient.

4. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 3, characterized in that: Selecting the non-singular fast terminal sliding surface of the bus regulator according to the state variables x1, x2 and the state equation includes: Among them, s NSMC is a non-singular fast terminal sliding surface, d1 and d2 are coefficients of the non-singular fast terminal sliding surface, p and q are both positive odd numbers, and p <q。 5. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 4, characterized in that: The time t when the non-singular fast terminal sliding surface of the busbar regulator reaches the equilibrium point G for: As the initial state equilibrium point of the state variable x1 is closer, the time when the non-singular fast terminal sliding mode surface of the busbar regulator reaches the equilibrium point is faster, that is, the time t G When it reaches 0, it reaches the equilibrium point.

6. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 4, characterized in that: The parameters of the non-singular fast terminal sliding surface of the bus regulator defined by the stability theorem include: When NSMC >0, τ=1, and then:

7. The method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism according to claim 6, characterized in that: The method of using the stability theorem to define the parameters of the non-singular fast terminal sliding surface of the busbar regulator also includes: When NSMC <0, τ=0, and then:

8. A system using the method for suppressing disturbance of power supply of a high-voltage circuit breaker motor drive mechanism as claimed in any one of claims 1 to 7, characterized in that: include: A model building module is used to connect the bus regulator in parallel with the capacitor bank on the power supply side of the motor drive mechanism of the high-voltage circuit breaker to establish a bus regulator model of the power supply of the motor drive mechanism of the high-voltage circuit breaker; A calculation module is used to construct state variables and obtain state equations based on the power supply bus regulator model of the high-voltage circuit breaker motor drive mechanism; The disturbance suppression module is used to select a non-singular fast terminal sliding surface of the bus regulator according to the state equation, and use the stability theorem to limit the parameters of the non-singular fast terminal sliding surface of the bus regulator to achieve disturbance suppression of the high-voltage circuit breaker motor drive mechanism.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having computer program instructions stored thereon, wherein the computer-executable instructions, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.

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