A self-excitation type excitation busbar device based on parallel multiplexing

Abstract

The application relates to a self-parallel excitation type excitation bus device based on parallel multiplexing, which is connected with an engine, and comprises silicon thyristors and an automatic excitation regulator, wherein the automatic excitation regulator is connected with the silicon thyristors, and the automatic excitation regulator comprises: a measurement module, which is used for acquiring an actual output voltage of a generator in real time in each preset period Q, comparing the actual output voltage of the generator with a first voltage value set in advance, and acquiring a voltage comparison result; a determination module, which is used for determining a control angle of the silicon thyristor for adjusting an excitation current in each preset period Q based on the voltage comparison result and / or an overvoltage time set in advance in a first preset time period; and an execution module, which is used for outputting an excitation current corresponding to the control angle based on the control angle.

Description

Technical Field

[0001] This invention relates to the field of generator excitation technology, and in particular to a self-excited excitation combiner device based on parallel multiplexing. Background Technology

[0002] The most basic function of an excitation regulator is to regulate the generator's terminal voltage. A commonly used excitation regulator is a proportional regulator, whose main input is the generator terminal voltage, and whose output controls the excitation power unit. The output decreases when the voltage increases and increases when the voltage decreases. However, the static excitation system is affected by faults at the generator terminals and in the system. In cases where the three-phase short circuit near the generator has a long disconnection time, it cannot provide sufficient excitation in a timely manner, thus affecting the transient stability of the power system.

[0003] Existing technologies use PID control models superimposed with PSS control models to regulate the excitation current. However, this method is slow. Furthermore, various situations inevitably occur during engine operation, such as short-term voltage anomalies in the generator, which are quickly recovered. However, the existing PID control model superimposed with PSS control model will detect and adjust the generator voltage when it is short-term, but this adjustment will be delayed, causing abnormal effects on subsequent generator operation. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a self-excited excitation combiner device based on parallel multiplexing, which solves the technical problem that the existing PID control model superimposed with the PSS control model will detect short-term abnormalities in the generator voltage and make adjustments, but the adjustment at this time will have lag and have an abnormal impact on the subsequent operation of the generator.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, embodiments of the present invention provide a self-excited excitation combiner device based on parallel multiplexing, connected to an engine. The combiner device includes a thyristor and an automatic excitation regulator. The automatic excitation regulator is connected to the thyristor and includes:

[0009] The measurement module is used to acquire the actual output voltage of the generator in real time within each preset period Q, and compare the actual output voltage of the generator with a preset first voltage value to obtain the voltage comparison result;

[0010] The determination module is used to determine the control angle of the thyristor used to adjust the excitation current within each preset cycle Q, based on the voltage comparison result and / or the overpressure time preset in the first preset time period.

[0011] The execution module is used to output an excitation current corresponding to the control angle based on the control angle.

[0012] Preferably, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, specifically includes:

[0013] Within each preset period Q, if the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then a correction value of the actual output voltage of the generator is obtained based on the actual output voltage of the generator, and then the control angle of the thyristor used to adjust the excitation current is determined based on the correction value of the actual output voltage of the generator.

[0014] Preferably, if the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and a preset first voltage value is greater than a preset threshold, then a correction value for the actual output voltage of the generator is obtained based on the actual output voltage of the generator, specifically including:

[0015] If the voltage comparison result is that the actual output voltage of the generator is greater than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then according to the actual output voltage of the generator, the correction value H of the actual output voltage of the generator is obtained by formula (1).

[0016] The formula (1) is:

[0017] H = Ht - Hx;

[0018] Hx is a preset correction frequency value when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not dropped to the preset first voltage value;

[0019] If the voltage comparison result is that the actual output voltage of the generator is less than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then according to the actual output voltage of the generator, the correction value H of the actual output voltage of the generator is obtained by formula (2).

[0020] The formula (2) is:

[0021] H = Ht + Hk;

[0022] Hk is a preset correction frequency used when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not been increased to the preset first voltage value.

[0023] Preferably,

[0024] Where Hx = w1x + b1;

[0025] w1 is a pre-set first weight value;

[0026] x is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is greater than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0027] b1 is a first pre-defined constant.

[0028] Preferably,

[0029] Where Hk = w2k + b2;

[0030] w2 is a pre-set second weight value;

[0031] k is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is less than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0032] b2 is a second pre-defined constant.

[0033] Preferably,

[0034] The control angle of the thyristor used to adjust the excitation current, which corresponds to the correction value of the actual output voltage of the generator, is the average value of the control angle of the thyristor corresponding to the generator when the generator is operating normally and the actual output voltage of the generator is the same as the correction value of the actual output voltage of the generator, as statistically analyzed in advance over a 6-month period.

[0035] Preferably, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, further includes:

[0036] If the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is less than the preset threshold, then the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is compared with the preset overpressure time T to obtain the time comparison result, and based on the time comparison result, the control angle of the thyristor used to adjust the excitation current is set.

[0037] The first pre-time period is 1 / 5 of the preset period Q time.

[0038] Preferably, based on the time comparison result, the control angle of the thyristor used to adjust the excitation current is set, specifically including:

[0039] If the time comparison result is that the actual output voltage of the generator is less than or less than the preset first voltage value for a period of time within the first preset time period, and the time is greater than the preset overpressure time T, then the control angle of the thyristor used to adjust the excitation current is set to the preset initial control angle.

[0040] If the time comparison result is that the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is less than the preset overpressure time T, then the control angle of the current thyristor remains unchanged.

[0041] Preferably,

[0042] Wherein, the preset overpressure time T is the average time taken from when the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, to when the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is less than the preset threshold, which is statistically recorded in advance within a 6-month period; or, the preset overpressure time T is 10 minutes.

[0043] Preferably, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, specifically includes:

[0044] If the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the actual output voltage of the generator is compared with the preset reference voltage to obtain the deviation signal of the generator.

[0045] The deviation signal is then amplified to obtain a comprehensive control signal, and the control angle of the thyristor used to regulate the excitation current is adjusted according to the change of the comprehensive control signal.

[0046] (III) Beneficial Effects

[0047] The beneficial effects of this invention are as follows: The self-excited excitation combiner device based on parallel multiplexing of this invention employs a measurement module to acquire the actual output voltage of the generator in real time within each preset period Q, and compares the actual output voltage of the generator with a preset first voltage value to obtain a voltage comparison result. A determination module, within each preset period Q, determines the control angle of the thyristor used to adjust the excitation current based on the voltage comparison result and / or a preset overpressure time within a first preset time period. An execution module, based on the control angle, outputs the excitation current corresponding to that control angle. Compared to existing technologies, this invention can ignore some short-term abnormalities in engine voltage and can quickly adjust the engine voltage by adjusting the control angle of the thyristor used to adjust the excitation current, thereby outputting the excitation current corresponding to that control angle. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of an automatic excitation regulator in a self-excited excitation combiner device based on parallel multiplexing according to the present invention;

[0049] Figure 2 This is a schematic diagram of a self-excited shunt excitation combiner device based on parallel multiplexing according to the present invention. Detailed Implementation

[0050] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0052] Example 1

[0053] See Figure 1 This embodiment provides a self-excited excitation combiner device based on parallel multiplexing, connected to an engine. The combiner device includes a thyristor and an automatic excitation regulator. The automatic excitation regulator is connected to the thyristor and includes:

[0054] The measurement module is used to acquire the actual output voltage of the generator in real time within each preset period Q, and compare the actual output voltage of the generator with a preset first voltage value to obtain the voltage comparison result.

[0055] The determination module is used to determine the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or the overpressure time preset in the first preset time period.

[0056] In one specific embodiment, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, specifically includes:

[0057] Within each preset period Q, if the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then a correction value of the actual output voltage of the generator is obtained based on the actual output voltage of the generator, and then the control angle of the thyristor used to adjust the excitation current is determined based on the correction value of the actual output voltage of the generator.

[0058] The execution module is used to output an excitation current corresponding to the control angle based on the control angle.

[0059] In the practical application of this embodiment, if the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and a preset first voltage value is greater than a preset threshold, then a correction value for the actual output voltage of the generator is obtained based on the actual output voltage of the generator, specifically including:

[0060] If the voltage comparison result is that the actual output voltage of the generator is greater than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the correction value H of the actual output voltage of the generator is obtained by formula (1) based on the actual output voltage of the generator.

[0061] The formula (1) is:

[0062] H = Ht - Hx;

[0063] Hx is a preset correction frequency value when adjusting the actual output voltage of the generator if the actual output voltage Ht of the generator has not dropped to the preset first voltage value.

[0064] If the voltage comparison result is that the actual output voltage of the generator is less than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the correction value H of the actual output voltage of the generator is obtained by formula (2) according to the actual output voltage of the generator.

[0065] The formula (2) is:

[0066] H = Ht + Hk;

[0067] Hk is a preset correction frequency used when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not been increased to the preset first voltage value.

[0068] In one specific implementation, Hx = w1x + b1.

[0069] w1 is a pre-set first weight value.

[0070] x is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is greater than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0071] b1 is a first pre-defined constant.

[0072] Where Hk = w2k + b2.

[0073] w2 is a pre-set second weight value.

[0074] k is the sequence number of the preset period Q, starting from the case where the voltage comparison result shows that the actual output voltage of the generator is less than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0075] b2 is a second pre-defined constant.

[0076] In the specific application of this embodiment, the control angle of the thyristor used to adjust the excitation current, which corresponds to the correction value of the actual output voltage of the generator, is the average value of the control angle of the thyristor corresponding to the generator when the generator is working normally and the actual output voltage of the generator is the same as the correction value of the actual output voltage of the generator, as statistically analyzed in advance over a 6-month period.

[0077] This embodiment presents a self-excited shunt excitation combiner device based on parallel multiplexing. Due to the use of a measurement module, the actual output voltage of the generator is acquired in real time within each preset period Q, and compared with a preset first voltage value to obtain a voltage comparison result. A determination module, within each preset period Q, determines the control angle of the thyristor used to adjust the excitation current based on the voltage comparison result and / or a preset overpressure time within a first preset time period. An execution module, based on the control angle, outputs the excitation current corresponding to that control angle. Compared to existing technologies, this device can ignore short-term abnormalities in engine voltage and can quickly adjust the engine voltage by adjusting the control angle of the thyristor used to adjust the excitation current, thereby outputting the excitation current corresponding to that control angle.

[0078] Example 2

[0079] See Figure 2 ,exist Figure 2 In application scenarios, this embodiment provides a self-excited excitation combiner device based on parallel multiplexing, such as... Figure 1 As shown, the automatic excitation regulator in the combiner unit, connected to the engine, includes:

[0080] The measurement module is used to acquire the actual output voltage of the generator in real time within each preset period Q, and compare the actual output voltage of the generator with a preset first voltage value to obtain the voltage comparison result.

[0081] The determination module is used to determine the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or the overpressure time preset in the first preset time period.

[0082] In one specific embodiment, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, specifically includes:

[0083] Within each preset period Q, if the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then a correction value of the actual output voltage of the generator is obtained based on the actual output voltage of the generator, and then the control angle of the thyristor used to adjust the excitation current is determined based on the correction value of the actual output voltage of the generator.

[0084] The execution module is used to output an excitation current corresponding to the control angle based on the control angle.

[0085] Excitation regulators play a crucial role in power systems, maintaining the voltage setpoint of generators or other control points, controlling the rational distribution of reactive power of parallel-operating units, and improving the stability of the power system.

[0086] In the practical application of this embodiment, if the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and a preset first voltage value is greater than a preset threshold, then a correction value for the actual output voltage of the generator is obtained based on the actual output voltage of the generator, specifically including:

[0087] If the voltage comparison result is that the actual output voltage of the generator is greater than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the correction value H of the actual output voltage of the generator is obtained by formula (1) based on the actual output voltage of the generator.

[0088] The formula (1) is:

[0089] H = Ht - Hx;

[0090] Hx is a preset correction frequency value when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not dropped to the preset first voltage value.

[0091] If the voltage comparison result is that the actual output voltage of the generator is less than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the correction value H of the actual output voltage of the generator is obtained by formula (2) according to the actual output voltage of the generator.

[0092] The formula (2) is:

[0093] H = Ht + Hk.

[0094] Hk is a preset correction frequency used when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not been increased to the preset first voltage value.

[0095] In one specific implementation, Hx = w1x + b1.

[0096] w1 is a pre-set first weight value.

[0097] x is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is greater than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0098] b1 is a first pre-defined constant.

[0099] Where Hk = w2k + b2.

[0100] w2 is a pre-set second weight value.

[0101] k is the sequence number of the preset period Q, starting from the case where the voltage comparison result shows that the actual output voltage of the generator is less than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold.

[0102] b2 is a second pre-defined constant.

[0103] In the specific application of this embodiment, the control angle of the thyristor used to adjust the excitation current, which corresponds to the correction value of the actual output voltage of the generator, is the average value of the control angle of the thyristor corresponding to the generator when the generator is working normally and the actual output voltage of the generator is the same as the correction value of the actual output voltage of the generator, as statistically analyzed in advance over a 6-month period.

[0104] In another embodiment of this example, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, further includes:

[0105] If the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is less than the preset threshold, then the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is compared with the preset overpressure time T to obtain the time comparison result, and based on the time comparison result, the control angle of the thyristor used to adjust the excitation current is set.

[0106] The first pre-time period is 1 / 5 of the preset period Q time.

[0107] Specifically, based on the time comparison result, the control angle of the thyristor used to adjust the excitation current is set, including:

[0108] If the time comparison result is that the actual output voltage of the generator is less than or less than the preset first voltage value for a period of time within the first preset time period, and this time is greater than the preset overpressure time T, then the control angle of the thyristor used to adjust the excitation current is set to the preset initial control angle.

[0109] If the time comparison result is that the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is less than the preset overpressure time T, then the control angle of the current thyristor remains unchanged.

[0110] Wherein, the preset overpressure time T is the average time taken from when the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, to when the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is less than the preset threshold, which is statistically recorded in advance within a 6-month period; or, the preset overpressure time T is 10 minutes.

[0111] In another embodiment of this example, determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, specifically includes:

[0112] If the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the actual output voltage of the generator is compared with the preset reference voltage to obtain the deviation signal of the generator.

[0113] The deviation signal is then amplified to obtain a comprehensive control signal, and the control angle of the thyristor used to regulate the excitation current is adjusted according to the change of the comprehensive control signal.

[0114] Specifically, the excitation regulator detects the generator's voltage, current, or other state parameters, and then adjusts the thyristor according to the specified adjustment criteria to achieve the control function.

[0115] This embodiment presents a self-excited shunt excitation combiner device based on parallel multiplexing. Due to the use of a measurement module, the actual output voltage of the generator is acquired in real time within each preset period Q, and compared with a preset first voltage value to obtain a voltage comparison result. A determination module, within each preset period Q, determines the control angle of the thyristor used to adjust the excitation current based on the voltage comparison result and / or a preset overpressure time within a first preset time period. An execution module, based on the control angle, outputs the excitation current corresponding to that control angle. Compared to existing technologies, this device can ignore short-term abnormalities in engine voltage and can quickly adjust the engine voltage by adjusting the control angle of the thyristor used to adjust the excitation current, thereby outputting the excitation current corresponding to that control angle.

[0116] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0117] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions.

[0118] It should be noted that any reference numerals placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In claims that enumerate several means, several of these means may be embodied by the same hardware. The use of the terms first, second, third, etc., is merely for convenience of expression and does not indicate any order. These terms can be understood as part of the component names.

[0119] Furthermore, it should be noted that in the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0120] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims should be interpreted to include both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0121] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention should also include these modifications and variations.

Claims

1. A self-excited shunt current collector based on parallel multiplexing, connected to an engine, characterized in that, The busbar includes a silicon controlled thyristor and an automatic excitation regulator. The automatic excitation regulator is connected to the silicon controlled thyristor and includes: The measurement module is used to acquire the actual output voltage of the generator in real time within each preset period Q, and compare the actual output voltage of the generator with a preset first voltage value to obtain the voltage comparison result; The determination module is used to determine the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or the overpressure time preset in the first preset time period. The execution module is used to output an excitation current corresponding to the control angle based on the control angle; Within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, the control angle of the thyristor used to adjust the excitation current is determined, specifically including: Within each preset period Q, if the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then a correction value of the actual output voltage of the generator is obtained based on the actual output voltage of the generator, and then the control angle of the thyristor used to adjust the excitation current is determined based on the correction value of the actual output voltage of the generator. If the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and a preset first voltage value is greater than a preset threshold, then a correction value for the actual output voltage of the generator is obtained based on the actual output voltage of the generator, specifically including: If the voltage comparison result is that the actual output voltage of the generator is greater than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then according to the actual output voltage of the generator, the correction value H of the actual output voltage of the generator is obtained by formula (1); The formula (1) is: H = Ht - Hx; Hx is a preset correction frequency value when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not dropped to the preset first voltage value. If the voltage comparison result is that the actual output voltage of the generator is less than the preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then according to the actual output voltage of the generator, the correction value H of the actual output voltage of the generator is obtained by formula (2). The formula (2) is: H = Ht + Hk; Hk is a preset correction frequency when adjusting the actual output voltage of the generator when the actual output voltage Ht of the generator has not been increased to the preset first voltage value; Where Hx = w1x + b1; w1 is a pre-set first weight value; x is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is greater than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold. b1 is a first pre-defined constant.

2. The apparatus according to claim 1, characterized in that, in, Hk = w2k + b2; w2 is a pre-set second weight value; k is the sequence number of the preset period Q starting from the case where the voltage comparison result shows that the actual output voltage of the generator is less than a preset first voltage value, and the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than a preset threshold. b2 is a second pre-defined constant.

3. The apparatus according to claim 2, characterized in that, The control angle of the thyristor used to adjust the excitation current, which corresponds to the correction value of the actual output voltage of the generator, is the average value of the control angle of the thyristor corresponding to the generator when the generator is operating normally and the actual output voltage of the generator is the same as the correction value of the actual output voltage of the generator, as statistically analyzed in advance over a 6-month period.

4. The apparatus according to claim 3, characterized in that, The step of determining the control angle of the thyristor used to adjust the excitation current within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, further includes: If the voltage comparison result is that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is less than the preset threshold, then the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is compared with the preset overpressure time T to obtain the time comparison result, and based on the time comparison result, the control angle of the thyristor used to adjust the excitation current is set. The first pre-time period is 1 / 5 of the preset period Q time.

5. The apparatus according to claim 4, characterized in that, Based on the time comparison results, the control angle of the thyristor used to adjust the excitation current is set, specifically including: If the time comparison result is that the actual output voltage of the generator is less than or less than the preset first voltage value for a period of time within the first preset time period, and the time is greater than the preset overpressure time T, then the control angle of the thyristor used to adjust the excitation current is set to the preset initial control angle. If the time comparison result is that the time during which the actual output voltage of the generator is greater than or less than the preset first voltage value within the first preset time period is less than the preset overpressure time T, then the control angle of the current thyristor remains unchanged.

6. The apparatus according to claim 5, characterized in that, in, The preset overpressure time T is the average time taken from when the absolute value of the difference between the generator's actual output voltage and the preset first voltage value is greater than a preset threshold, to when the absolute value of the difference between the generator's actual output voltage and the preset first voltage value is less than a preset threshold, based on statistics collected over a 6-month period; or, the preset overpressure time T is 10 minutes.

7. The apparatus according to claim 1, characterized in that, Within each preset period Q, based on the voltage comparison result and / or a pre-set overvoltage time within a first preset time period, the control angle of the thyristor used to adjust the excitation current is determined, specifically including: If the voltage comparison result shows that the absolute value of the difference between the actual output voltage of the generator and the preset first voltage value is greater than the preset threshold, then the actual output voltage of the generator is compared with the preset reference voltage to obtain the deviation signal of the generator. The deviation signal is then amplified to obtain a comprehensive control signal, and the control angle of the thyristor used to regulate the excitation current is adjusted according to the change of the comprehensive control signal.

Images