Parameter setting method and device for successful grid connection of distributed phase modifier

Abstract

The application provides a parameter setting method and device for grid-connection success of a distributed phase modifier, and the method comprises the following steps: determining a frequency slip setting value of the distributed phase modifier according to an experiment; determining a maximum allowed value of a center frequency of a synchronization window according to an impact requirement or an experience value of the distributed phase modifier when closing; determining a frequency difference setting value of the distributed phase modifier according to the frequency slip setting value and the maximum allowed value of the center frequency of the synchronization window; determining a minimum allowed time of the synchronization window of the distributed phase modifier according to an error of a lead-in time; and determining an angle difference setting value of the distributed phase modifier according to the minimum allowed time of the synchronization window. The application makes the grid-connection closing of the phase modifier no longer blind, can ensure 100% grid-connection success, and can effectively reduce the closing impact.

Description

Technical Field

[0001] This invention relates to the field of new energy grid connection technology, and in particular to a parameter tuning method and apparatus for successful grid connection of distributed synchronous condensers. Background Technology

[0002] With the rapid development of new energy sources, the large capacity and high proportion of new energy in some areas have significantly constrained the power grid's ability to transmit these sources. Since existing large synchronous condensers are concentrated in converter stations or substations, their effectiveness in improving voltage stability near new energy power plants is limited. Analysis of past large-scale wind turbine disconnection failures shows that insufficient short-circuit capacity or dynamic reactive power regulation capability of wind farms is a major cause of large-scale interlocking disconnections. Distributed small-to-medium capacity synchronous condensers can flexibly and locally enhance the short-circuit capacity, dynamic reactive power support capability, and rotational inertia of new energy power plants, playing a significant role in preventing disconnections of wind, solar, and other new energy power generation equipment and improving voltage and frequency stability in areas where new energy power plants are located. Therefore, distributed synchronous condensers have been widely used in the past decade.

[0003] Large synchronous condensers exhibit relatively stable idle speed characteristics. The time from idle speed to reduced speed to rated speed is approximately 18-19 seconds, corresponding to an average frequency slip df / dt of approximately 0.12 Hz / s to 0.13 Hz / s. However, the idle speed characteristics of distributed synchronous condensers vary considerably depending on the system, generator unit, and system configuration. The time to reduce speed from 3150 rpm to the rated 3000 rpm varies greatly, ranging from approximately 15-80 seconds. Because the idle speed characteristics of distributed synchronous condensers differ under different conditions, and the initial angle difference at the start of idle speed varies from 0° to 360°, the synchronization window time that satisfies both angle difference and frequency difference less than a set value becomes more uncertain, and the existence of a synchronization window itself becomes more uncertain. This results in a lower grid connection success rate. Therefore, existing generator synchronization, large synchronous condenser synchronization devices, and synchronization setpoint calculation methods for 100% grid connection success rates are not entirely applicable to distributed synchronous condenser synchronization.

[0004] For example, existing technologies generally improve grid connection success rates by setting a large frequency difference setpoint. However, since the angle difference at the start of the idle speed varies from 0 to 360°, it is uncertain whether a synchronization window (a time window in which both the frequency difference and the angle difference are less than the setpoint) exists, the location of the synchronization window, the duration of the synchronization window, and the frequency difference on both sides at the moment of closing. Furthermore, no method for setting the angle difference setpoint on both sides has been provided. Therefore, existing technologies have a certain degree of blindness in synchronizing closing, which may cause a large closing impact and may even lead to grid connection failure. Summary of the Invention

[0005] In view of this, the present invention provides a parameter tuning method and apparatus for successful grid connection of distributed synchronous condensers, in order to solve at least one of the problems mentioned above.

[0006] To achieve the above objectives, the present invention adopts the following solution:

[0007] According to a first aspect of the present invention, a parameter setting method for successful grid connection of a distributed synchronous condenser is provided. The method includes: determining the frequency slip setting of the distributed synchronous condenser based on experiments; determining the maximum allowable value of the center frequency of the synchronization window based on the impact requirements or empirical values ​​of the distributed synchronous condenser during closing; determining the frequency difference setting of the distributed synchronous condenser based on the frequency slip setting and the maximum allowable value of the center frequency of the synchronization window; determining the minimum allowable time of the synchronization window of the distributed synchronous condenser based on the lead time error; and determining the angle difference setting of the distributed synchronous condenser based on the minimum allowable time of the synchronization window.

[0008] As an embodiment of the present invention, the method described above for determining the frequency slip setpoint of the distributed synchronous condenser based on experiments includes: determining the frequency slip setpoint of the distributed synchronous condenser based on a sham synchronization experiment.

[0009] As an embodiment of the present invention, the maximum allowable value of the center frequency of the synchronous window in the above method is preferably 0.1Hz to 0.2Hz.

[0010] As an embodiment of the present invention, the method described above for determining the frequency difference setpoint of the distributed synchronous condenser based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window includes:

[0011] Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula:

[0012]

[0013] In the above formula, Δf set For the frequency offset setting of the distributed synchronous condenser, D set For the frequency slip constant, Δf max This is the maximum allowable value for the center frequency of the window during the same period.

[0014] As an embodiment of the present invention, the error of the lead time in the above method is obtained through multiple actual measurements.

[0015] As an embodiment of the present invention, the minimum allowable time for the concurrent window in the above method is determined according to the following formula:

[0016] t min =k k t err ;

[0017] In the above formula, t min k is the minimum allowed time for the concurrent window. k The reliability coefficient ranges from 1.1 to 1.5; t err This represents the error in the lead time.

[0018] As an embodiment of the present invention, the method described above for determining the angle difference setpoint of the distributed synchronous condenser based on the minimum allowable time of the synchronous window includes:

[0019] Based on the minimum allowable time of the synchronous window, the angular difference setpoint of the distributed synchronous condenser is determined by the following formula:

[0020] ΔA set ≥180t min Δf set ;

[0021] In the above formula, ΔA set Set the angular difference value for the distributed synchronous condenser; t min Δf is the minimum allowed time within the concurrent window. set The frequency difference setting for distributed synchronous condensers.

[0022] According to a second aspect of the present invention, a parameter setting device for successful grid connection of a distributed synchronous condenser is provided. The device includes: a frequency slip determination unit, configured to determine the frequency slip setting value of the distributed synchronous condenser based on experiments; a center frequency determination unit, configured to determine the maximum allowable value of the center frequency of the synchronization window based on the impact requirements or empirical values ​​on the distributed synchronous condenser during closing; a frequency difference setting unit, configured to determine the frequency difference setting value of the distributed synchronous condenser based on the frequency slip setting value and the maximum allowable value of the center frequency of the synchronization window; a minimum allowable time determination unit, configured to determine the minimum allowable time of the synchronization window of the distributed synchronous condenser based on the error of the lead time; and an angle difference setting unit, configured to determine the angle difference setting value of the distributed synchronous condenser based on the minimum allowable time of the synchronization window.

[0023] As an embodiment of the present invention, the frequency slip determination unit is specifically used to: determine the frequency slip setpoint of the distributed synchronous condenser based on the sham synchronization test.

[0024] As an embodiment of the present invention, the maximum allowable value of the center frequency of the above-mentioned synchronous window is preferably 0.1Hz to 0.2Hz.

[0025] As an embodiment of the present invention, the frequency difference setting unit is specifically used for:

[0026] Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula:

[0027]

[0028] In the above formula, Δf set For the frequency offset setting of the distributed synchronous condenser, D set For the frequency slip constant, Δf max This is the maximum allowable value for the center frequency of the window during the same period.

[0029] As an embodiment of the present invention, the error of the lead time was obtained through multiple actual measurements.

[0030] As an embodiment of the present invention, the minimum allowable time of the above-mentioned synchronization window is determined according to the following formula:

[0031] t min =k k t err ;

[0032] In the above formula, t min k is the minimum allowed time for the concurrent window. k The reliability coefficient ranges from 1.1 to 1.5; t err This represents the error in the lead time.

[0033] As an embodiment of the present invention, the above-mentioned angle difference determination unit is specifically used for:

[0034] Based on the minimum allowable time of the synchronous window, the angular difference setpoint of the distributed synchronous condenser is determined by the following formula:

[0035] ΔA set ≥180t min Δf set ;

[0036] In the above formula, ΔA set Set the angular difference value for the distributed synchronous condenser; t min Δf is the minimum allowed time within the concurrent window. set The frequency difference setting for distributed synchronous condensers.

[0037] According to a third aspect of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method.

[0038] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0039] The parameter tuning method and apparatus for successful grid connection of distributed synchronous condensers proposed in this invention ensures a synchronization window that meets grid connection conditions during the condenser's idle process by setting appropriate frequency difference and angle difference values, thereby achieving 100% grid connection success and solving the problem of low grid connection success rate in existing technologies. Furthermore, by limiting the maximum allowable value of the center frequency of the synchronization window, this angle difference setting places the synchronization window closer to the region where the frequency difference is zero, thus reducing the frequency difference during closing and effectively reducing closing impact. Simultaneously, by setting a minimum allowable time for the synchronization window, excessive closing angle deviation caused by lead time error is avoided, further reducing closing impact. Finally, this invention comprehensively considers multiple factors such as frequency slip, synchronization window position, time length, center frequency, and lead time error, and provides tuning methods for the frequency difference and angle difference values, making the grid connection and closing of synchronous condensers no longer blind, improving the reliability and safety of grid connection operations. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0041] Figure 1 This is a schematic diagram of the frequency difference qualified window and the angle difference variation curve within the synchronous window provided in the embodiments of this application;

[0042] Figure 2 This is a flowchart illustrating a method for successfully connecting distributed synchronous condensers to the grid, as provided in an embodiment of this application.

[0043] Figure 3 This is a schematic diagram of the structure of a parameter setting device for successful grid connection of a distributed synchronous condenser provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0046] The present invention aims to solve the problems of low grid connection success rate and large closing impact in the current technology of distributed synchronous condensers. Through systematic parameter tuning, it ensures 100% grid connection success and reduces closing impact.

[0047] In fact, for distributed synchronous condensers awaiting grid connection, several tests are generally required before commissioning to determine the system's characteristic parameters. These include the range and average value of frequency slip during the idle process, the distribution range, average value, and error range of the lead time, and the optimal frequency and angle differences at the closing moment to minimize system impact. Therefore, this test information can be fully utilized to ensure a 100% grid connection success rate while minimizing closing impact.

[0048] Based on the aforementioned system characteristic parameters, combined with the position, duration, center frequency, and lead time error of the synchronization window, this invention provides a method for setting the frequency difference and angle difference values. Simultaneously, it sets the minimum time of the synchronization window based on the lead time error, and sets the maximum allowable value of the center frequency of the synchronization window based on closing impact or empirical values. This method eliminates the blindness in synchronous condenser grid connection closing, ensuring 100% grid connection success, while effectively reducing closing impact.

[0049] Before detailing the parameter tuning method of this invention, several technical terms involved in this invention will be explained first:

[0050] "Frequency slip": During the idling process of the camera, the derivative of the frequency difference between the two sides at any time t is denoted by the symbol D(t), that is, D(t) = dΔf / dt.

[0051] "Frequency difference acceptable window": During the phase shifter's idle process, the frequency difference is less than the frequency difference setpoint Δf. set The time window.

[0052] "Synchronization window": During the phase shifter idle process, within the frequency difference acceptable window, the angle difference on both sides is less than the angle difference setpoint ΔA. set The time window.

[0053] "Center frequency of synchronous window": The frequency at the center of the synchronous window is called the center frequency of the synchronous window.

[0054] Before introducing the parameter tuning method of this invention, the two major influencing factors of simultaneous grid connection are explained as follows:

[0055] (1) The error of the lead time Tdq and the length of the contemporaneous window time

[0056] There is a time delay from the closing command sent by the synchronization device to the closing of the main contacts of the circuit breaker, including the circuit breaker closing time, the action time of the synchronization relay, etc. This delay time is represented by the lead time. However, the circuit breaker closing time has a certain discreteness, and each closing time is different. The relay also has a certain discreteness. Therefore, the lead time generally given is the average value. But each time of closing, the delay time is variable and there is a certain error from the lead time. Assuming this time error is dt, and after the closing command is sent, the frequency difference between the two sides is △f, then the closing angle error caused by the error of the lead time is:

[0057] ΔA = 360 * dt * Δf

[0058] Assume that the synchronization device accurately captures the closing point and sends the closing command at Tdq before the moment when the angular difference between the two sides is zero. Then, at the moment when the main contacts close, the angular difference between the two sides is very likely to be △A in the above formula. Assume that the time length △t_window of the synchronization window is not large enough to satisfy △t_window < dt. Then, at the closing moment, the angular difference may exceed the angular difference setting value △A set , thus increasing the closing impact.

[0059] (2) The position and center frequency of the synchronization window.

[0060] Obviously, the closer the position of the synchronization window is to the zero point of the frequency difference, the smaller the frequency difference during closing and the smaller the closing impact. The most unfavorable situation is that the synchronization window is located when the frequency difference just reaches the frequency difference setting value. At this time, when closing, the frequency difference is close to the frequency difference setting value and is the largest. According to the above formula ΔA = 360 * dt * Δf, the angle error caused by the lead time error is the largest and the closing impact is the largest.

[0061] Based on the above two factors, the present invention takes into account the position, time length, center frequency of the synchronization window, and the error of the lead time. According to these factors, the synchronization setting value is set, which can ensure 100% successful grid connection and reduce the closing impact.

[0062] In fact, the necessary synchronization window can be determined by the following formula:

[0063] <s

[0064] In the above formula, Δf set is the frequency difference setting value, and D set is the frequency slip.

[0065] This formula shows that, referring to Figure 1 , the maximum angular difference change amount △Amax within the qualified frequency difference window exceeds 360°, that is:

[0066]

[0067] Therefore, the maximum angular difference Δφ within the frequency difference compliance window max For angles exceeding 360°, regardless of the initial angular difference Δφ(0) at the qualified time of frequency difference (Δf=Δfset), it takes any value between 0° and 360°:

[0068]

[0069] Therefore, within the acceptable frequency difference window, there must be a synchronous point with an angle difference equal to 360°, that is, a point where the voltage phasors on both sides coincide. As a result, the grid connection success rate is very high.

[0070] However, the frequency difference setpoint that satisfies the equation ΔA = 360 * dt * Δf is generally quite large. Taking Dset = 0.12 Hz / s as an example, the frequency difference setpoint calculated according to ΔA = 360 * dt * Δf is 0.49 Hz. If the frequency difference at the moment the main contacts of the circuit breaker close is equal to this value, it may cause a large closing impact.

[0071] To reduce closing impact, in addition to satisfying ΔA=360*dt*Δf, the position of the synchronization window should also be restricted to avoid the most unfavorable closing situation. Specifically, the center frequency of the synchronization window must be set to be less than a certain value to correct the set frequency difference, ensuring the synchronization window is located closer to the point where the frequency difference is zero, thus minimizing the frequency difference at the moment the main contacts close.

[0072] Meanwhile, to prevent closing impact caused by lead time errors, the synchronization window length can be required to be greater than the lead time error. Since the synchronization window length is proportional to the angle difference setpoint, the required synchronization window length can be achieved by setting the angle difference setpoint.

[0073] Based on the above reasons, this application provides a parameter tuning method and apparatus for successful grid connection of distributed synchronous condensers. Among them, such as... Figure 2 The diagram shown is a flowchart illustrating a parameter setting method for successful grid connection of a distributed synchronous condenser according to an embodiment of this application. This embodiment describes the application from the perspective of the synchronizing device. The synchronizing device refers to a synchronization device used for grid connection of distributed synchronous condensers. It is responsible for detecting the frequency difference and phase difference between the synchronous condenser to be connected and the system, and issuing a closing command when preset conditions are met, causing the circuit breaker to close, thereby realizing the grid connection of the distributed synchronous condenser. The method may include the following steps:

[0074] Step S201: Determine the frequency slip setting of the distributed synchronous condenser based on the experiment.

[0075] The idle speed characteristics (time from idle speed to reduced speed to rated speed) of distributed synchronous condensers differ from those of large synchronous condensers. They vary considerably depending on factors such as the system, generator set, and system configuration, resulting in significant differences in the frequency slip D(t) = dΔf / dt. Therefore, it is necessary to determine the frequency slip setpoint D for each distributed synchronous condenser through experiments. set .

[0076] Preferably, in this embodiment, a sham synchronization test method can be used to simulate grid-connected operation when the synchronous condenser is not connected to the grid, record frequency change data, and calculate the frequency slip D. set .

[0077] Step S202: Determine the maximum allowable value of the center frequency of the synchronization window based on the impact requirements or empirical values ​​on the distributed synchronous condenser during closing.

[0078] The closer the center frequency of the synchronization window is to zero, the smaller the frequency difference during closing, and the smaller the closing impact. Therefore, it is necessary to limit the maximum allowable value Δf of the center frequency of the synchronization window. max This places it closer to the region where the frequency difference is zero. Δf max The value can be determined based on the impact requirements of the distributed synchronous condenser during closing or empirical values. For example, through multiple tests, observe the impact situation (voltage and current fluctuation amplitude) during closing at different center frequencies, and finally determine an acceptable maximum value.

[0079] Preferably, in this embodiment, Δf max The value is between 0.1Hz and 0.2Hz, which is a balance between grid connection success rate and closing impact. Too small a Δf... max While a higher value can reduce closing impact, it narrows the frequency difference compliance window, thus shortening the time for the synchronization window to appear and reducing the grid connection success rate. An excessively large Δf... max While a higher frequency can improve grid connection success rate, it also increases closing impact. Therefore, the range of 0.1Hz to 0.2Hz is the preferred range to balance grid connection success rate and closing impact, ensuring a high grid connection success rate while effectively reducing closing impact.

[0080] Step S203: Determine the frequency difference setpoint of the distributed synchronous condenser based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window.

[0081] Preferably, determining the frequency difference setpoint of the distributed synchronous condenser based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window in this step may specifically include:

[0082] Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula:

[0083]

[0084] In the above formula, Δf set For the frequency offset setting of the distributed synchronous condenser, D set For the frequency slip constant, Δf max This is the maximum allowable value for the center frequency of the window during the same period.

[0085] in, This indicates that a synchronization window is guaranteed. This condition ensures that the maximum angle difference change within the qualified frequency difference window exceeds 360°. Regardless of the initial angle difference, there will always be a synchronization point where the voltage phasors on both sides coincide, thus achieving a high grid connection success rate. In order to reduce the closing impact, this condition limits the maximum value of the center frequency of the synchronization window, bringing it closer to the region where the frequency difference is zero, thereby reducing the frequency difference and impact during closing.

[0086] As can be seen from the above, setting the frequency offset value in the above manner can effectively reduce the closing impact while ensuring a high grid connection success rate, making it a preferred solution that balances performance and safety.

[0087] Step S204: Determine the minimum allowable time for the synchronization window of the distributed synchronous condenser based on the error of the lead time.

[0088] The lead time is the time delay from issuing the closing command to the closing of the main contacts of the circuit breaker; it has an error t. err Due to the existence of lead-ahead time error, the actual angle difference at the closing moment may deviate from the preset value, thus increasing the closing impact. To avoid this situation, it is necessary to set a minimum allowable time t for the synchronization window. min Make it greater than the error t of the lead time. err .

[0089] Preferably, the minimum allowable time for the synchronization window in this step is determined according to the following formula:

[0090] t min =k k t err ;

[0091] In the above formula, t min k is the minimum allowed time for the concurrent window. k The reliability coefficient ranges from 1.1 to 1.5; t err The error in the lead time can be obtained through multiple actual measurements.

[0092] Step S205: Determine the angle difference setpoint of the distributed synchronous condenser based on the minimum allowable time of the synchronous window.

[0093] Angular difference constant ΔAset The length of the synchronization window is determined by this. To avoid excessive deviation in the closing angle caused by lead time error, the synchronization window length needs to be sufficiently long.

[0094] Therefore, in order to overcome the impact of lead time error, ensure grid connection reliability, and reduce closing impact, in this embodiment, the angle difference setpoint ΔA is... set It can be determined by the following formula:

[0095] ΔA set ≥180t min Δf set ;

[0096] In the above formula, ΔA set Set the angular difference value for the distributed synchronous condenser; t min Δf is the minimum allowed time within the concurrent window. set The frequency difference setting for distributed synchronous condensers.

[0097] As mentioned above, there is an error t in the lead time. err This error can cause the angle difference at the actual closing time to deviate from the expected value, potentially leading to closing failure or increased closing impact. To solve this problem, the duration of the synchronization window needs to be long enough so that closing can be completed within the allowable angle difference range even with a lead time error.

[0098] According to the formula ΔA=360*dt*Δf (where dt is the lead time error and Δf is the frequency difference between the two sides), the angular difference error caused by the lead time error is proportional to the frequency difference Δf. And t min =k k t err This represents the minimum allowable time for the synchronization window set to overcome the lead time error. Therefore, ΔA is set... set ≥180t min Δf set It can ensure that the duration of the synchronization window is long enough, so that even if there is a lead time error, a suitable closing point can be found to ensure successful grid connection and reduce closing impact.

[0099] As described above, the parameter tuning method for successful grid connection of distributed synchronous condensers proposed in this invention ensures a synchronization window that meets grid connection conditions during the condenser's idle process by setting appropriate frequency difference and angle difference values, thereby achieving 100% grid connection success and solving the problem of low grid connection success rate in existing technologies. Furthermore, this angle difference setting limits the maximum allowable value of the center frequency of the synchronization window, placing the synchronization window closer to the region with zero frequency difference, thus reducing the frequency difference during closing and effectively reducing closing impact. Simultaneously, by setting a minimum allowable time for the synchronization window, excessive closing angle deviation caused by lead time error is avoided, further reducing closing impact. Finally, this invention comprehensively considers multiple factors such as frequency slip, synchronization window position, time length, center frequency, and lead time error, and provides tuning methods for frequency difference and angle difference values, making synchronous condenser grid connection closing no longer blind and improving the reliability and safety of grid connection operations.

[0100] like Figure 3 The diagram shown is a schematic representation of a parameter setting device for successful grid connection of a distributed synchronous condenser according to an embodiment of this application. The device includes: a frequency slip determination unit 310, a center frequency determination unit 320, a frequency difference setpoint determination unit 330, a minimum allowable time determination unit 340, and an angle difference setpoint determination unit 350, which are connected sequentially.

[0101] The frequency slip determination unit 310 is used to determine the frequency slip setpoint of the distributed synchronous condenser based on experiments.

[0102] The center frequency determination unit 320 is used to determine the maximum allowable value of the center frequency of the synchronization window based on the impact requirements or empirical values ​​on the distributed synchronous condenser during closing.

[0103] The frequency difference setting unit 330 is used to determine the frequency difference setting of the distributed synchronous condenser based on the frequency slip setting and the maximum allowable value of the center frequency of the synchronous window.

[0104] The minimum allowable time determination unit 340 is used to determine the minimum allowable time of the synchronization window of the distributed synchronous condenser based on the error of the lead time.

[0105] Angle difference setpoint determination unit 350 is used to determine the angle difference setpoint of the distributed synchronous condenser based on the minimum allowable time of the synchronous window.

[0106] As an embodiment of the present invention, the frequency slip determination unit 310 is specifically used to: determine the frequency slip setpoint of the distributed synchronous condenser based on the sham synchronization test.

[0107] As an embodiment of the present invention, the maximum allowable value of the center frequency of the above-mentioned synchronous window is preferably 0.1Hz to 0.2Hz.

[0108] As an embodiment of the present invention, the frequency difference setting unit 330 is specifically used for:

[0109] Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula:

[0110]

[0111] In the above formula, Δf set For the frequency offset setting of the distributed synchronous condenser, D set For the frequency slip constant, Δf max This is the maximum allowable value for the center frequency of the window during the same period.

[0112] As an embodiment of the present invention, the error of the lead time was obtained through multiple actual measurements.

[0113] As an embodiment of the present invention, the minimum allowable time of the above-mentioned synchronization window is determined according to the following formula:

[0114] t min =k k t err ;

[0115] In the above formula, t min k is the minimum allowed time for the concurrent window. k The reliability coefficient ranges from 1.1 to 1.5; t err This represents the error in the lead time.

[0116] As an embodiment of the present invention, the above-mentioned angle difference determination unit 350 is specifically used for:

[0117] Based on the minimum allowable time of the synchronous window, the angular difference setpoint of the distributed synchronous condenser is determined by the following formula:

[0118] ΔA set ≥180t min Δf set ;

[0119] In the above formula, ΔA set Set the angular difference value for the distributed synchronous condenser; t min Δf is the minimum allowed time within the concurrent window. set The frequency difference setting for distributed synchronous condensers.

[0120] As described above, the parameter setting device for successful grid connection of distributed synchronous condensers proposed in this invention ensures that a synchronization window meeting the grid connection conditions always exists during the condenser's idle speed process by setting appropriate frequency difference and angle difference values, thereby achieving 100% grid connection success and solving the problem of low grid connection success rate in existing technologies. Furthermore, this angle difference setting limits the maximum allowable value of the center frequency of the synchronization window, placing the synchronization window closer to the region where the frequency difference is zero, thus reducing the frequency difference during closing and effectively reducing closing impact. Simultaneously, by setting a minimum allowable time for the synchronization window, excessive closing angle deviation caused by lead time error is avoided, further reducing closing impact. Finally, this invention comprehensively considers multiple factors such as frequency slip, synchronization window position, time length, center frequency, and lead time error, and provides setting methods for the frequency difference and angle difference values, making the grid connection and closing of synchronous condensers no longer blind, improving the reliability and safety of grid connection operations.

[0121] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Figure 4 The illustrated electronic device is a general-purpose data processing apparatus, comprising a general-purpose computer hardware structure, including at least a processor 801 and a memory 802. The processor 801 and memory 802 are connected via a bus 803. The memory 802 is adapted to store one or more instructions or programs executable by the processor 801. These instructions or programs are executed by the processor 801 to implement the steps in the parameter tuning method for successful grid connection of the distributed synchronous condensers described above.

[0122] The processor 801 described above can be a standalone microprocessor or a collection of one or more microprocessors. Thus, the processor 801 executes commands stored in the memory 802, thereby performing the method flow of the embodiments of the present invention as described above to process data and control other devices. The bus 803 connects the aforementioned components together, and also connects these components to the display controller 804, the display device, and the input / output (I / O) device 805. The input / output (I / O) device 805 can be a mouse, keyboard, modem, network interface, touch input device, motion-sensing input device, printer, and other devices known in the art. Typically, the input / output (I / O) device 805 is connected to the system via an input / output (I / O) controller 806.

[0123] The memory 802 can store software components, such as an operating system, a communication module, an interaction module, and application programs. Each of the modules and application programs described above corresponds to a set of executable program instructions that perform one or more functions and the methods described in the embodiments of the invention.

[0124] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described parameter tuning method for successful grid connection of distributed synchronous condensers.

[0125] As described above, the parameter tuning method and apparatus for successful grid connection of distributed synchronous condensers proposed in this invention ensures a synchronization window that meets grid connection conditions during the condenser's idle process by setting appropriate frequency difference and angle difference values, thereby achieving 100% grid connection success and solving the problem of low grid connection success rate in existing technologies. Furthermore, by limiting the maximum allowable value of the center frequency of the synchronization window, this angle difference setting places the synchronization window closer to the region where the frequency difference is zero, thus reducing the frequency difference during closing and effectively reducing closing impact. Simultaneously, by setting a minimum allowable time for the synchronization window, excessive closing angle deviation caused by lead time error is avoided, further reducing closing impact. Finally, this invention comprehensively considers multiple factors such as frequency slip, synchronization window position, time length, center frequency, and lead time error, and provides tuning methods for the frequency difference and angle difference values, making the grid connection and closing of synchronous condensers no longer blind, thus improving the reliability and safety of grid connection operations.

[0126] Preferred embodiments of the invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0127] 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.

[0128] 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, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A parameter tuning method for successful grid connection of distributed synchronous condensers, characterized in that, The method includes: The frequency slip setpoint of the distributed synchronous condenser was determined based on experiments. Based on the impact requirements or empirical values ​​on the distributed synchronous condenser during closing, determine the maximum allowable value of the center frequency of the synchronization window; The frequency difference setpoint of the distributed synchronous condenser is determined based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window; Based on the error in the lead time, determine the minimum allowable time for the synchronization window of the distributed synchronous condenser; The angular difference setting of the distributed synchronous condenser is determined based on the minimum allowable time of the synchronous window; The step of determining the frequency deviation setpoint of the distributed synchronous condenser based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window includes: Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula: ； In the above formula, To set the frequency difference value for distributed synchronous condensers, Assign a frequency slip value. This represents the maximum permissible value for the center frequency of the window during the same period; The step of determining the angle difference setpoint of the distributed synchronous condenser based on the minimum allowable time of the synchronous window includes: Based on the minimum allowable time of the synchronous window, the angular difference setpoint of the distributed synchronous condenser is determined by the following formula: ； In the above formula, Set the angular difference value for distributed synchronous condensers; This is the minimum allowed time for the concurrent window; The frequency difference setting for distributed synchronous condensers.

2. The parameter tuning method for successful grid connection of distributed synchronous condensers as described in claim 1, characterized in that, The determination of the frequency slip setpoint for the distributed synchronous condenser based on experiments includes: The frequency slip setting of the distributed synchronous condenser was determined based on the sham synchronization test.

3. The parameter tuning method for successful grid connection of distributed synchronous condensers as described in claim 1, characterized in that, The maximum allowable value for the center frequency of the synchronous window is 0.1Hz~0.2Hz.

4. The parameter tuning method for successful grid connection of distributed synchronous condensers as described in claim 1, characterized in that, The error in the lead time was obtained through multiple field measurements.

5. The parameter tuning method for successful grid connection of distributed synchronous condensers as described in claim 1, characterized in that, The minimum allowable time for the concurrent window is determined according to the following formula: ； In the above formula, t min k is the minimum allowed time for the concurrent window. k The reliability coefficient ranges from 1.1 to 1.5; t err This represents the error in the lead time.

6. A parameter tuning device for successful grid connection of distributed synchronous condensers, characterized in that, The device includes: The frequency slip determination unit is used to determine the frequency slip setpoint of the distributed synchronous condenser based on experiments. The center frequency determination unit is used to determine the maximum allowable value of the center frequency of the synchronization window based on the impact requirements or empirical values ​​on the distributed synchronous condenser during closing. The frequency difference setpoint determination unit is used to determine the frequency difference setpoint of the distributed synchronous condenser based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window; The minimum allowable time determination unit is used to determine the minimum allowable time of the synchronization window of the distributed synchronous condenser based on the error of the lead time. Angle difference setpoint determination unit is used to determine the angle difference setpoint of the distributed synchronous condenser based on the minimum allowable time of the synchronous window; The frequency difference setpoint determination unit is specifically used for: Based on the frequency slip setpoint and the maximum allowable value of the center frequency of the synchronous window, the frequency slip setpoint of the distributed synchronous condenser is determined using the following formula: ； In the above formula, To set the frequency difference value for distributed synchronous condensers, Assign a frequency slip value. This represents the maximum permissible value for the center frequency of the window during the same period; The angle difference determination unit is specifically used to determine the angle difference setpoint of the distributed synchronous condenser according to the minimum allowable time of the synchronous window using the following formula: ； In the above formula, Set the angular difference value for distributed synchronous condensers; This is the minimum allowed time for the concurrent window; The frequency difference setting for distributed synchronous condensers.

7. The parameter setting device for successful grid connection of distributed synchronous condensers as described in claim 6, characterized in that, The frequency slip determination unit is specifically used to: determine the frequency slip setpoint of the distributed synchronous condenser based on the sham synchronization test.

8. The parameter setting device for successful grid connection of distributed synchronous condensers as described in claim 6, characterized in that, The maximum allowable value for the center frequency of the synchronous window is 0.1Hz~0.2Hz.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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