Output voltage regulation method, device, medium and equipment for controllable voltage source

Abstract

The present invention discloses a method, device, medium, and equipment for regulating the output voltage of a controllable voltage source. After a single-phase grounding fault occurs in a power grid system, the method first provides output compensation to the neutral point using an initial voltage amplitude and an initial voltage angle. Then, an angle characteristic deviation is calculated based on the voltage angle of the neutral point, the current angle of the output compensation of the controllable voltage source, and a reference angle. If the absolute value of the angle characteristic deviation is greater than a preset deviation threshold, the current voltage amplitude is adjusted based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold. The present invention can determine whether the current voltage has been accurately compensated based on the absolute value of the angle characteristic deviation, and can also automatically track and adjust the voltage based on the angle characteristic deviation, eliminating the impact of errors in the calculation of the system's distributed impedance.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a method, device, medium and equipment for regulating the output voltage of a controllable voltage source. Background Art

[0002] my country's medium-voltage distribution networks above 6kV generally use non-effective grounding systems. Due to the complex and changing operating environment, ground faults in these systems are frequent. Single-phase ground faults account for the largest proportion, exceeding 85%.

[0003] Arc suppression coils are a widely used technology for resolving single-phase ground faults, but practical applications still present several challenges, including low compensation accuracy and large residual currents. To address these issues, existing technologies have further proposed active full compensation methods based on modern power electronics, the most representative of which is the ground fault neutralizer (GFN). However, the residual current in this method cannot be directly obtained and must be calculated indirectly using the system's ground distribution parameters. This often leads to large errors in the calculation of the residual current, resulting in inaccurate voltage compensation at the fault point and inability to reliably extinguish the arc. Summary of the Invention

[0004] Based on this, it is necessary to provide an output voltage regulation method, device, medium and equipment for a controllable voltage source to solve the problem that the voltage compensation of the fault point in the existing technology is not accurate enough and the arc cannot be extinguished reliably.

[0005] A method for regulating the output voltage of a controllable voltage source is applied to a voltage regulation system including a controllable voltage source, an arc suppression coil, and a power grid system, wherein the controllable voltage source and the arc suppression coil are respectively connected in parallel to the power grid system and to the neutral point of the power grid system. The method comprises:

[0006] After a single-phase grounding fault occurs in the power grid system, driving the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle;

[0007] Calculating the absolute value of the phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and taking the difference between the absolute value of the phase difference and a preset reference angle as the angle characteristic deviation;

[0008] Determine whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold. If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0009] In one embodiment, adjusting the current voltage amplitude based on the angle characteristic deviation includes:

[0010] If the angle characteristic deviation is greater than 0, the current voltage amplitude is increased integrally based on the angle characteristic deviation ratio; if the angle characteristic deviation is less than 0, the current voltage amplitude is decreased integrally based on the angle characteristic deviation ratio.

[0011] In one embodiment, the increasing the current voltage amplitude in an integral manner based on the angle characteristic deviation ratio, and the decreasing the current voltage amplitude in an integral manner based on the angle characteristic deviation ratio, include:

[0012] Multiplying the angle characteristic deviation by a preset proportional coefficient to obtain a proportional term, and multiplying the angle characteristic deviation by a preset integral coefficient to obtain an integral term;

[0013] Adding the proportional term and the integral term to obtain a sum term;

[0014] The current voltage amplitude is adjusted by superimposing the summation term on the current voltage amplitude.

[0015] In one embodiment, the method further includes: presetting the initial voltage amplitude to the nominal phase voltage amplitude of the power grid system.

[0016] In one embodiment, the method further includes: if the current voltage amplitude after adjustment does not fall within a preset amplitude range, determining that the output voltage regulation of the controllable voltage source is abnormal; wherein the amplitude range is the product of the nominal phase voltage amplitude and a preset proportional range.

[0017] In one embodiment, the method further includes: presetting the reference angle to 90°.

[0018] In one embodiment, the method further includes: presetting the deviation threshold to be between [0.1, 0.5°].

[0019] An output voltage regulating device for a controllable voltage source is applied to a voltage regulating system including a controllable voltage source, an arc suppression coil, and a power grid system, wherein the controllable voltage source and the arc suppression coil are respectively connected in parallel to the power grid system and to the neutral point of the power grid system. The device comprises:

[0020] an initial compensation module, configured to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the power grid system;

[0021] A compensation adjustment module is used to calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and use the difference between the absolute value of the phase difference and a preset reference angle as an angle characteristic deviation; determine whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold; if the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0022] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes the steps of the output voltage regulation method of the controllable voltage source.

[0023] An output voltage regulating device for a controllable voltage source includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the above-mentioned output voltage regulating method for the controllable voltage source.

[0024] The present invention provides a method, apparatus, medium, and device for regulating the output voltage of a controllable voltage source. After a single-phase grounding fault occurs in a power grid system, the method first provides output compensation to the neutral point using an initial voltage amplitude and an initial voltage angle. An angle characteristic deviation is then calculated based on the voltage angle at the neutral point, the current angle of the controllable voltage source output compensation, and a reference angle. If the absolute value of the angle characteristic deviation is greater than a preset deviation threshold, the current voltage amplitude is adjusted based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold. The present invention can determine whether the current voltage has been accurately compensated based on the absolute value of the angle characteristic deviation and can also automatically track and adjust the voltage based on the angle characteristic deviation, eliminating the impact of errors in the calculation of the system's distributed impedance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] in:

[0027] Figure 1 Schematic diagram of a flow chart of a method for regulating the output voltage of a controllable voltage source;

[0028] Figure 2 It is the compensation state equivalent circuit diagram of the voltage regulation system;

[0029] Figure 3 Schematic diagram of the phase relationship when the arc coil is in the over-compensation state;

[0030] Figure 4 This is a phase relationship diagram when the neutral point is not grounded or the arc suppression coil is in an under-compensated state;

[0031] Figure 5 This is the simulation waveform diagram of the output voltage regulation method;

[0032] Figure 6 It is a structural diagram of an output voltage regulating device of a controllable voltage source;

[0033] Figure 7 FIG. 1 is a structural block diagram of an output voltage regulating device for a controllable voltage source. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0036] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] like Figure 1 As shown, Figure 1 FIG. 1 is a flow chart of a method for regulating the output voltage of a controllable voltage source in one embodiment. The method is applied to a voltage regulation system including a controllable voltage source, an arc suppression coil, and a power grid system. Figure 2The figure shows the compensation state equivalent circuit diagram of the voltage regulation system. is a controllable voltage source; under the premise that the arc suppression coil is in overcompensation state, Z 0S is the parallel impedance formed by the arc suppression coil and the system distributed capacitance; under the premise that the neutral point is not grounded or the arc suppression coil is under-compensated, Z 0S The parallel impedance formed by the distributed capacitance of the system; is the ground fault phase power supply of the power grid system, and point N is the neutral point of the power grid system. It can be seen that the controllable voltage source and the arc suppression coil are connected in parallel to the power grid system, and both the controllable voltage source and the arc suppression coil are connected to the neutral point of the power grid system. In addition, Z0 is the internal impedance of the controllable voltage source; R d is the ground transition resistance; Output current for the controllable voltage source; is the grounding point current; For flow through Z 0S Current; is the neutral point voltage of the power grid system.

[0038] Then, from the above Figure 2 It can be seen that:

[0039]

[0040] Furthermore, in the above Figure 2 On the basis of, if the arc suppression coil is in an over-compensated state, the present invention summarizes the phase relationship between the current output by the controllable voltage source and the neutral point voltage of the power grid system, such as Figure 3 As shown, there are three cases as follows:

[0041] (1) When the grounding point current is fully compensated, the neutral point voltage Should be the fault phase power supply The reverse voltage, is zero, so At this time, since the arc suppression coil of the power grid system is in an over-compensation state, Z 0S For inductive load. At this time, the neutral point voltage Voltage angle Leading controlled voltage source output current Current angle Equal to 90°, that is, the absolute value of the phase difference satisfies:

[0042]

[0043] (2) When the grounding current is not fully compensated and the current voltage amplitude output by the controllable voltage source is lower than the required target voltage amplitude, the system neutral point voltage The amplitude is lower than the fault phase power supply The voltage amplitude and grounding current is not zero, then:

[0044]

[0045] Since the system neutral point voltage The amplitude is lower than the fault phase power supply The voltage amplitude is, so in the above formula and Figure 2 The reference direction shown is opposite to that of the Make the controllable voltage source output current The phase is deflected clockwise, that is Figure 3 The obtuse angle shown At this time, the neutral point voltage Voltage angle Leading controlled voltage source output current Current angle Greater than 90°, that is, the absolute value of the phase difference satisfies:

[0046]

[0047] (3) When the grounding point current is not fully compensated and the output voltage amplitude of the controllable voltage source is higher than the required target voltage amplitude, the system neutral point voltage will inevitably The amplitude is higher than the fault phase power supply voltage amplitude, the grounding point current Also non-zero, at this time:

[0048]

[0049] Since the system neutral point voltage The amplitude is higher than the fault phase power supply The voltage amplitude is, so in the above formula and Figure 2 The reference direction is the same, which is offset Make the controllable voltage source output current The phase is deflected counterclockwise, that is Figure 3 The acute angle shown At this time, the neutral point voltage Voltage angle Leading controlled voltage source output current Current angle Less than 90°, that is, the absolute value of the phase difference satisfies:

[0050]

[0051] Furthermore, in the above Figure 2On the basis of, if the neutral point is not grounded or the arc suppression coil is in an under-compensated state, the present invention summarizes the phase relationship between the current output by the controllable voltage source and the neutral point voltage of the power grid system, such as Figure 4 As shown, it also includes the following three situations:

[0052] (4) When the grounding point current is fully compensated, the neutral point voltage Should be the fault phase power supply The reverse voltage, is zero, so At this time, since the neutral point is not grounded or the arc suppression coil of the power grid system is in an under-compensated state, Z 0S is a capacitive load. At this time, the neutral point voltage Voltage angle Hysteresis controlled voltage source output current Current angle Equal to 90°, that is, the absolute value of the phase difference satisfies:

[0053]

[0054] (5) When the grounding current is not fully compensated and the current voltage amplitude output by the controllable voltage source is lower than the required target voltage amplitude, the system neutral point voltage The amplitude is lower than the fault phase power supply The voltage amplitude and grounding current is not zero, then:

[0055]

[0056] Since the system neutral point voltage The amplitude is lower than the fault phase power supply The voltage amplitude is, so in the above formula and Figure 2 The reference direction shown is opposite to that of the Make the controllable voltage source output current The phase is deflected counterclockwise, that is Figure 4 The obtuse angle shown At this time, the neutral point voltage Voltage angle Hysteresis controlled voltage source output current Current angle Greater than 90°, that is, the absolute value of the phase difference satisfies:

[0057]

[0058] (6) When the grounding point current is not fully compensated and the output voltage amplitude of the controllable voltage source is higher than the required target voltage amplitude, the system neutral point voltage will inevitably The amplitude is higher than the fault phase power supply voltage amplitude, the grounding point current Also non-zero, at this time:

[0059]

[0060] Since the system neutral point voltage The amplitude is higher than the fault phase power supply The voltage amplitude is, so in the above formula and Figure 2 The reference direction is the same, which is offset Make the controllable voltage source output current The phase is deflected clockwise, that is Figure 4 The acute angle shown At this time, the neutral point voltage Voltage angle Hysteresis controlled voltage source output current Current angle Less than 90°, that is, the absolute value of the phase difference satisfies:

[0061]

[0062] Based on the above phase relationship, the output voltage regulation method of the controllable voltage source in this embodiment includes the following steps:

[0063] S101, after a single-phase grounding fault occurs in the power grid system, driving a controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle.

[0064] A single-phase ground fault occurs when a short circuit occurs between one phase and the ground in a power system, while the other two phases operate normally. Because a single-phase ground fault restricts current flow between two phases and prevents balanced distribution across the three phases, it can cause voltage imbalance in the power grid, unbalanced torque in three-phase motors, and overheating of equipment windings, posing a significant safety hazard to the power system.

[0065] The controllable voltage source can stabilize the output voltage and current. In this embodiment, output compensation is first provided to the neutral point with the initial voltage amplitude and the initial voltage angle, so that the amplitude required for voltage amplitude adjustment can be preliminarily determined.

[0066] In a specific embodiment, the initial voltage amplitude is preset to the nominal phase voltage amplitude of the power grid system, that is, preset to the normal voltage amplitude before the fault. This specific embodiment can make the subsequent adjustment speed the fastest in most cases.

[0067] S102: Calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and use the difference between the absolute value of the phase difference and a preset reference angle as the angle characteristic deviation.

[0068] Here we first calculate The difference between the result value and the reference angle is calculated as the angle characteristic deviation.

[0069] In a specific embodiment, based on the analysis of the above phase relationships (1)-(6), the preset reference angle is set to 90°.

[0070] S103: Determine whether the absolute value of the angle feature deviation is greater than a preset deviation threshold. If the absolute value of the angle feature deviation is greater than the preset deviation threshold, execute S104; if the absolute value of the angle feature deviation is less than or equal to the preset deviation threshold, execute S105.

[0071] In a specific embodiment, the preset deviation threshold is between [0.1, 0.5°]. Of course, the deviation threshold can also be adjusted according to actual conditions.

[0072] If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, it means that the grounding point current has not been accurately compensated and the arc has not been reliably extinguished, and further fine adjustment is required in S104. Otherwise, it is considered that the grounding point current has been accurately compensated and the arc has been reliably extinguished, and S105 is executed.

[0073] S104: Adjust the current voltage amplitude based on the angle characteristic deviation and the compensation state of the arc suppression coil until the absolute value of the angle characteristic deviation is less than or equal to a preset deviation threshold.

[0074] In a specific embodiment, based on the analysis of the phase relationships (2) and (5) above, the current voltage amplitude is adjusted as follows:

[0075] If the angle characteristic deviation is greater than 0, the current voltage amplitude is increased integrally based on the angle characteristic deviation ratio, so that the current voltage amplitude is close to the voltage amplitude when the controllable voltage source is fully compensated. Accordingly, the angle characteristic deviation will also be closer to 0.

[0076] The specific method of increasing proportionally and integrally is as follows:

[0077] The angle characteristic deviation is multiplied by a preset proportional coefficient to obtain a proportional term, and the angle characteristic deviation is multiplied by a preset integral coefficient to obtain an integral term; the proportional term and the integral term are added to obtain a summation term; and the current voltage amplitude is adjusted by superimposing the summation term on the current voltage amplitude. Here, since the angle characteristic deviation is a positive value, the summation term obtained after proportional-integral calculation is also a positive value. When superimposed on the current voltage amplitude, the output voltage amplitude of the controllable voltage source can be increased, approaching the voltage amplitude when the controllable voltage source is fully compensated. Accordingly, the angle characteristic deviation will also be closer to 0.

[0078] In a specific embodiment, based on the analysis of the phase relationships (3) and (6) above, the current voltage amplitude is adjusted as follows:

[0079] If the angle characteristic deviation is less than 0, the current voltage amplitude is reduced integrally based on the angle characteristic deviation ratio, so that the current voltage amplitude is close to the voltage amplitude when the controllable voltage source is fully compensated. Accordingly, the angle characteristic deviation will also be closer to 0.

[0080] Similarly, the specific way to reduce proportional integral is:

[0081] The angle characteristic deviation is multiplied by a preset proportional coefficient to obtain a proportional term, and the angle characteristic deviation is multiplied by a preset integral coefficient to obtain an integral term; the proportional term and the integral term are added to obtain a summation term; and the current voltage amplitude is adjusted by superimposing the summation term on the current voltage amplitude. Here, because the angle characteristic deviation is a negative value, the summation term obtained after proportional-integral calculation is also a negative value. When superimposed on the current voltage amplitude, the output voltage amplitude of the controllable voltage source can be reduced to approach the voltage amplitude when the controllable voltage source is fully compensated. Accordingly, the angle characteristic deviation will also be closer to 0.

[0082] In one specific embodiment, the following step is further performed: if the current voltage amplitude after adjustment does not fall within a preset amplitude range, determining that the output voltage regulation of the controllable voltage source is abnormal; wherein the amplitude range is the product of the nominal phase voltage amplitude and a preset ratio range. Optionally, the preset ratio range is 80%-120%. If the voltage adjustment does not fall within the preset amplitude range, manual fault confirmation is required.

[0083] S105, stop adjusting the current voltage amplitude.

[0084] The above-mentioned method for regulating the output voltage of a controllable voltage source, after a single-phase ground fault occurs in the power grid system, first provides output compensation to the neutral point using the initial voltage amplitude and initial voltage angle. Then, an angle characteristic deviation is calculated based on the voltage angle of the neutral point, the current angle of the output compensation of the controllable voltage source, and the reference angle. If the absolute value of the angle characteristic deviation is greater than a preset deviation threshold, the current voltage amplitude is adjusted based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold. The present invention can determine whether the current voltage has been accurately compensated based on the absolute value of the angle characteristic deviation, and can also automatically track and adjust the voltage based on the angle characteristic deviation, eliminating the impact of errors in the calculation of the system's distributed impedance.

[0085] To more clearly illustrate the beneficial effects of the present invention, see Figure 5 , which is a simulation waveform diagram of the output voltage regulation method provided by the present invention.

[0086] like Figure 5 As shown in the figure, the simulation system is set to have a phase A ground fault at 0.2s, the controllable voltage source is compensated at 0.4s, and the ground transition resistance is 300 ohms. A is the voltage of phase A; U a_rms is the effective value of phase A voltage; I d is the ground fault current; I d_rms is the effective value of the ground fault current; Ang err is the angle characteristic deviation. E com is the effective value of the output voltage of the controllable voltage source, that is, the current voltage amplitude.

[0087] according to Figure 5 From the simulation waveform of (f), we can see that the initial voltage amplitude of the controllable voltage source is 5.77kV. From 0.4s on, the current voltage amplitude is compensated based on the angle characteristic deviation. Figure 5 From the simulation waveform (e), we can see that in the stable state, Angerr is as low as 0.4°. At this time, the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold, and the controller stops adjusting the current voltage amplitude. Figure 5 From the simulation waveform of (e), we can see that at about 0.6s, the output of the controllable voltage source stabilizes to 5.866kV. Figure 5 From the simulation waveform (d), we can see that the ground fault current I d It is reduced from 3.46A at the initial grounding moment to 0.025A; according to Figure 5 As can be seen from the simulated waveform (b), the voltage of phase A drops from 1.037 kV to 0.003 kV. At this point, the voltage at the fault point is accurately compensated, and the arc is reliably extinguished.

[0088] In one embodiment, Figure 6As shown, an output voltage regulation device of a controllable voltage source is proposed, which is applied to a voltage regulation system including a controllable voltage source, an arc suppression coil, and a power grid system. The controllable voltage source and the arc suppression coil are respectively connected in parallel to the power grid system and connected to the neutral point of the power grid system. The device includes:

[0089] The initial compensation module 601 is used to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the power grid system;

[0090] The compensation adjustment module 602 is used to calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and use the difference between the absolute value of the phase difference and the preset reference angle as the angle characteristic deviation; determine whether the absolute value of the angle characteristic deviation is greater than the preset deviation threshold; if the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0091] Figure 7 FIG. 1 shows an internal structure diagram of an output voltage regulating device of a controllable voltage source in one embodiment. Figure 7 As shown, the output voltage regulating device of the controllable voltage source includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the output voltage regulating device of the controllable voltage source stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the output voltage regulating method of the controllable voltage source. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement the output voltage regulating method of the controllable voltage source. It will be understood by those skilled in the art that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the output voltage regulating device of the controllable voltage source to which the scheme of the present application is applied. The specific output voltage regulating device of the controllable voltage source may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0092] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps: after a single-phase grounding fault occurs in a power grid system, driving a controllable voltage source to provide output compensation to a neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle; calculating the absolute value of the phase difference between the voltage angle of the neutral point and the current angle of the output compensation of the controllable voltage source, and taking the difference between the absolute value of the phase difference and a preset reference angle as an angle characteristic deviation; judging whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold; if the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjusting the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0093] An output voltage regulating device for a controllable voltage source comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented: after a single-phase grounding fault occurs in a power grid system, the controllable voltage source is driven to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle; the absolute value of the phase difference between the voltage angle of the neutral point and the current angle of the output compensation of the controllable voltage source is calculated, and the difference between the absolute value of the phase difference and a preset reference angle is used as an angle characteristic deviation; and whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold is determined. If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, the current voltage amplitude is adjusted based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0094] It should be noted that the above-mentioned output voltage regulation method, device, equipment and computer-readable storage medium of the controllable voltage source belong to a general inventive concept, and the contents of the embodiments of the output voltage regulation method, device, equipment and computer-readable storage medium of the controllable voltage source are applicable to each other.

[0095] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, which can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0096] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for regulating the output voltage of a controllable voltage source, characterized in that: The method is applied to a voltage regulation system including a controllable voltage source, an arc suppression coil, and a power grid system, wherein the controllable voltage source and the arc suppression coil are respectively connected in parallel to the power grid system and to the neutral point of the power grid system. After a single-phase grounding fault occurs in the power grid system, driving the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle; Calculating the absolute value of the phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and taking the difference between the absolute value of the phase difference and a preset reference angle as the angle characteristic deviation; the preset reference angle is 90°; Determine whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold. If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

2. The method according to claim 1, characterized in that The adjusting the current voltage amplitude based on the angle characteristic deviation includes: If the angle characteristic deviation is greater than 0, the current voltage amplitude is increased integrally based on the angle characteristic deviation ratio; if the angle characteristic deviation is less than 0, the current voltage amplitude is decreased integrally based on the angle characteristic deviation ratio.

3. The method according to claim 2, characterized in that The increasing the current voltage amplitude in an integral manner based on the angle characteristic deviation ratio, and the decreasing the current voltage amplitude in an integral manner based on the angle characteristic deviation ratio, include: Multiplying the angle characteristic deviation by a preset proportional coefficient to obtain a proportional term, and multiplying the angle characteristic deviation by a preset integral coefficient to obtain an integral term; Adding the proportional term and the integral term to obtain a sum term; The current voltage amplitude is adjusted by superimposing the summation term on the current voltage amplitude.

4. The method according to claim 1, wherein The method further includes: presetting the initial voltage amplitude to a nominal phase voltage amplitude of the power grid system.

5. The method according to claim 4, characterized in that The method further includes: if the adjusted current voltage amplitude does not fall within a preset amplitude range, determining that the output voltage regulation of the controllable voltage source is abnormal; wherein the amplitude range is the product of the nominal phase voltage amplitude and a preset proportional range.

6. The method according to claim 1, characterized in that The method further includes: presetting the deviation threshold to be between [0.1, 0.5°].

7. An output voltage regulating device of a controllable voltage source, characterized in that: Applicable to a voltage regulation system comprising a controllable voltage source, an arc suppression coil, and a power grid system, wherein the controllable voltage source and the arc suppression coil are respectively connected in parallel to the power grid system and to the neutral point of the power grid system, and the device comprises: an initial compensation module, configured to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the power grid system; a compensation adjustment module, configured to calculate an absolute value of a phase difference between the voltage angle of the neutral point and the current angle compensated by the controllable voltage source output, and use the difference between the absolute value of the phase difference and a preset reference angle as an angle characteristic deviation; the preset reference angle is 90°; Determine whether the absolute value of the angle characteristic deviation is greater than a preset deviation threshold. If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

8. A computer-readable storage medium, characterized in that A computer program is stored, and when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 6.

9. An output voltage regulating device for a controllable voltage source, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 6.

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