Filter configuration method and system and storage medium

Abstract

The invention discloses a filter configuration method and system and a storage medium, and the method comprises the steps: determining the capacity of a filter corresponding to a converter station based on the predicted active power corresponding to the converter station, the commutation parameter of a converter in the converter station, and the reactive exchange capacity limit value corresponding to the converter station, and determining the capacity of the filter according to the capacity of the filter; configuring an operation filter bank and a standby filter bank in the converter station; and further detecting a reactive exchange capacity actual value corresponding to the converter station, and when it is determined that the change rate of the reactive exchange capacity actual value relative to the reactive exchange capacity limit value exceeds a preset change threshold value, performing configuration updating on an operation filter bank and a standby filter bank in the converter. According to the method, the filter in the converter station is configured and updated according to the actual value of the reactive exchange capacity in the operation process of the converter station, so that the capacity of the filter configured for the converter station is matched with the reactive exchange capacity of the converter station, and reactive power consumed by the converter station can be accurately and effectively compensated.

Description

Technical Field

[0001] The present invention relates to the field of filter technology, and in particular to a filter configuration method, system and storage medium. Background Art

[0002] A converter station is a station in a high-voltage direct current transmission system that is built to convert alternating current into direct current or vice versa, and to meet the power system's requirements for safety, stability, and power quality. The converter station consumes reactive power during the rectification and inversion process. If the reactive power cannot be effectively compensated, it will lead to excessive reactive power exchange between the AC and DC systems, causing large changes in the AC voltage, and in severe cases, the DC transmission system will not be able to operate effectively.

[0003] The AC filter in the converter station is a device that provides reactive power compensation. The amount of compensation it can provide is closely related to the capacity of the AC filter. However, it is difficult to accurately determine the capacity of the AC filter based on reactive power, especially when the amount of reactive power consumed by the converter station changes. This will result in too much or too little compensation, which will also affect the operation of the DC transmission system. Therefore, how to accurately determine the capacity of the AC filter in the converter station and configure it is one of the technical problems that need to be solved at present. Summary of the invention

[0004] The main purpose of the present invention is to provide a filter configuration method, system and medium, aiming to solve the technical problem of how to accurately determine the capacity of the AC filter in the converter station and configure it in the prior art.

[0005] To achieve the above object, the present invention provides a filter configuration method, the filter configuration method comprising:

[0006] Predicting the active power of the DC transmission system corresponding to the converter station, and obtaining the commutation parameters of the converter in the converter station;

[0007] Determine the filter capacity corresponding to the converter station according to the active power, the commutation parameters, and the reactive exchange amount limit corresponding to the converter station, and configure the operating filter group and the standby filter group in the converter station according to the filter capacity;

[0008] During the operation of the operating filter group, the actual value of the reactive exchange amount corresponding to the converter station is detected to determine whether the change rate of the actual value of the reactive exchange amount relative to the reactive exchange amount limit value exceeds a preset change threshold;

[0009] If the change rate exceeds a preset change threshold, the configuration of the operating filter group and the standby filter group in the converter is updated.

[0010] Preferably, if the change rate exceeds a preset change threshold, the step of updating the configuration of the operating filter group and the standby filter group in the converter comprises:

[0011] If the change rate exceeds a preset change threshold, determining a change direction corresponding to the change rate;

[0012] If the change direction is positive, determining a first filter from each spare filter of the spare filter group according to the change rate, and connecting the first filter configuration to the operating filter group;

[0013] If the change direction is negative, a second filter is determined from each operating filter of the operating filter group according to the change rate, and the second filter is cut off from the operating filter group to be configured as the spare filter group.

[0014] Preferably, the step of determining the first filter from the backup filters of the backup filter group according to the change rate comprises:

[0015] Determine whether the change duration corresponding to the change rate is greater than a preset duration, and if so, generate a reactive exchange amount increment between the actual reactive exchange amount value and the reactive exchange amount limit value, and obtain the standby capacity of each standby filter in the standby filter group;

[0016] According to the reactive exchange amount increment and each of the spare capacities, a first filter is determined from each of the spare filters in the spare filter group.

[0017] Preferably, the step of determining the first filter from each backup filter of the backup filter group according to the reactive exchange amount increment and each backup capacity comprises:

[0018] Arrange the spare capacities in order from small to large, and compare the reactive exchange amount increments with the spare capacities one by one based on the arrangement order;

[0019] Determine whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment; if so, search the spare filter corresponding to the currently compared spare capacity in each of the spare filters as the first filter.

[0020] Preferably, the step of judging whether the currently compared reserve capacity is greater than or equal to the reactive exchange amount increment comprises:

[0021] If it is determined through comparison that all the reserve capacities are smaller than the reactive exchange amount increment, then the reserve capacities are combined in pairs based on the arrangement order to generate a combination result;

[0022] According to the magnitude relationship between the combination result and the increased reactive exchange amount, the first filter among the backup filters of the backup filter group is determined.

[0023] Preferably, the step of determining the filter capacity corresponding to the converter station according to the active power, the commutation parameter, and the reactive exchange amount limit corresponding to the converter station comprises:

[0024] According to the active power, and the commutation angle and the trigger angle in the commutation parameters, a first filter capacity value corresponding to the converter station is calculated, wherein the calculation formula is:

[0025]

[0026] Wherein, Q1 represents the first filter capacity value, P represents active power, μ represents the commutation angle, and α represents the trigger angle;

[0027] A power flow calculation is performed based on the first filter capacity value and the active power to obtain a calculation result, and the filter capacity is determined according to the calculation result and the reactive exchange amount limit corresponding to the converter station.

[0028] Preferably, the step of performing power flow calculation based on the first filter capacity value and the active power to obtain a calculation result comprises:

[0029] Performing a power flow calculation according to the first filter capacity value and the active power to obtain a first reactive exchange amount corresponding to the converter station and the first filter capacity value;

[0030] The first filter capacity value and the first reactive exchange amount are added to obtain a second filter capacity value, and a secondary power flow calculation is performed according to the second filter capacity value and the active power to obtain a second reactive exchange amount corresponding to the converter station and the second filter capacity value;

[0031] The second filter capacity value and the second reactive exchange amount are added to obtain a third filter capacity value, and three power flow calculations are performed according to the third filter capacity value and the active power to obtain a third reactive exchange amount corresponding to the third filter capacity value of the converter station;

[0032] The first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount are generated as calculation results.

[0033] Preferably, the step of determining the filter capacity according to the calculation result and the reactive exchange amount limit corresponding to the converter station comprises:

[0034] Generate a first parameter, a second parameter and a third parameter according to the first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount;

[0035] According to a preset calculation formula, the first parameter, the second parameter, the third parameter, and the reactive exchange amount limit are calculated to obtain the filter capacity, and the preset calculation formula is:

[0036]

[0037] Where Qf represents the filter capacity, Q s represents the reactive exchange limit, and a1, a2, and a3 represent the first parameter, the second parameter, and the third parameter respectively.

[0038] Furthermore, to achieve the above object, the present invention also provides a filter configuration system, the filter configuration system comprising a storage, a processor, a communication bus and a control program stored in the storage:

[0039] The communication bus is used to realize the connection and communication between the processor and the storage;

[0040] The processor is used to execute the control program to implement the steps of the filter configuration method as described above.

[0041] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a storage medium, on which a control program is stored, and when the control program is executed by a processor, the steps of the filter configuration method as described above are implemented.

[0042] The filter configuration method, system and storage medium of the present invention predict the active power in the DC transmission system corresponding to the converter station and obtain the commutation parameters of the converter in the converter station; then determine the filter capacity corresponding to the converter station according to the active power, commutation parameters and reactive exchange amount limit corresponding to the converter station, and configure the operating filter group and standby filter group in the converter station according to the filter capacity; thereafter, during the operation of the operating filter group, detect the actual reactive exchange amount of the converter station, and determine the change rate of the actual reactive exchange amount relative to the reactive exchange amount limit, and then judge whether the change rate exceeds a preset change threshold; if it exceeds the preset change threshold, the operating filter group and the standby filter group in the converter are configured and updated. In this way, the filter in the converter station is configured by determining the filter capacity corresponding to the reactive exchange amount limit, and the configuration is updated according to the actual value of the reactive exchange amount during the operation of the converter station, so that the capacity of the filter configured for the converter station matches the reactive exchange amount of the converter station, and the reactive power consumed by the converter station can be accurately and effectively compensated. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flowchart of a first embodiment of a filter configuration method of the present invention;

[0044] Figure 2 is a flow chart of a second embodiment of a filter configuration method of the present invention;

[0045] Figure 3 is a flow chart of a third embodiment of a filter configuration method of the present invention;

[0046] Figure 4 It is a structural diagram of the hardware operating environment involved in an embodiment of the filter configuration system of the present invention.

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0049] The present invention provides a filter configuration method, please refer to Figure 1 , Figure 1 It is a flowchart of the first embodiment of the filter configuration method of the present invention.

[0050] The embodiment of the present invention provides an embodiment of a method for configuring a filter. It should be noted that although a logical order is shown in the flow chart, in some cases, the steps shown or described may be performed in an order different from that here. Specifically, the method for configuring a filter in this embodiment includes:

[0051] Step S10, predicting the active power of the DC transmission system corresponding to the converter station, and obtaining the commutation parameters of the converter in the converter station.

[0052] The filter configuration method of this embodiment is applied to the control center of the filter configuration system. The control center first predicts the active power of the DC transmission system corresponding to the converter station, and specifically predicts the various components in the DC transmission system, the historical active power of the various components, and the parameters of the various components. At the same time, the commutation parameters of the converter set in the converter station are obtained. Among them, the converter is a device for AC-DC conversion in the converter station, and its parameters mainly include the commutation angle and the trigger angle.

[0053] Step S20, determining the filter capacity corresponding to the converter station according to the active power, the commutation parameters, and the reactive exchange limit corresponding to the converter station, and configuring the operating filter group and the standby filter group in the converter station according to the filter capacity.

[0054] Furthermore, in order to ensure the normal operation of the converter station, a reactive exchange amount limit is pre-set for it to limit the amount of reactive exchange of the converter station. The control center obtains the reactive exchange amount limit, and determines the filter capacity corresponding to the converter station based on it, the active power, and the commutation parameters. The filter capacity is the capacity that effectively compensates for the reactive exchange amount limit. According to the filter capacity, the operating filter group and the standby filter group in the converter station are configured. Among them, the operating filter group is a plurality of filters actually operating in the converter station, and the total capacity of each filter is initially configured to match the determined filter capacity. The match can be that the total capacity is equal to the determined filter capacity, or it can be greater than the determined filter capacity. The standby filter group is a plurality of filters used to supplement the actually operating filters, and the total capacity after supplementation is configured to match the capacity required by the actual operation of the filter. The match can also be that the total capacity is equal to the actual operation capacity required, or it can be greater than the actual operation capacity required.

[0055] Step S30, during the operation of the operating filter group, the actual value of the reactive exchange amount corresponding to the converter station is detected to determine whether the change rate of the actual value of the reactive exchange amount relative to the reactive exchange amount limit exceeds a preset change threshold.

[0056] Furthermore, after the configuration of the operating filter group and the standby filter group in the converter station is completed, the actual value of the reactive exchange amount corresponding to the converter station is detected during the operation of the operating filter group in the converter station. The actual value of the reactive exchange amount is the actual value of the reactive power consumed by the converter station. Then, the actual value of the reactive exchange amount is subjected to a difference operation with the reactive exchange amount limit to obtain a difference result, and the difference result is subjected to a ratio operation with the reactive exchange amount limit to obtain a change rate of the actual value of the reactive exchange amount relative to the reactive exchange amount limit. In addition, in order to reflect the magnitude of the change, a preset change threshold is pre-set, and the generated change rate is compared with the preset change threshold to determine whether the change rate exceeds the preset change threshold.

[0057] Step S40: If the change rate exceeds a preset change threshold, the configuration of the operating filter group and the standby filter group in the converter is updated.

[0058] Furthermore, if the change rate is determined to exceed the preset change threshold value through comparison, it means that the actual value of the reactive exchange amount has changed significantly relative to the reactive exchange amount limit value, and the change may affect the normal operation of the converter station, so the configuration of the operating filter group and the standby filter group in the converter station is updated. On the contrary, if the change rate is determined to not exceed the preset change threshold value through comparison, it means that the actual value of the reactive exchange amount has not changed much relative to the reactive exchange amount limit value, and will not affect the normal operation of the converter station, and it is temporarily unnecessary to update the configuration of the operating filter group and the standby filter group in the converter station.

[0059] The filter configuration method of the present implementation predicts the active power in the DC transmission system corresponding to the converter station and obtains the commutation parameters of the converter in the converter station; then, according to the active power, commutation parameters, and reactive exchange quantity limit corresponding to the converter station, the filter capacity corresponding to the converter station is determined, and according to the filter capacity, the operating filter group and the standby filter group in the converter station are configured; thereafter, during the operation of the operating filter group, the actual value of the reactive exchange quantity of the converter station is detected, and the change rate of the actual value of the reactive exchange quantity relative to the reactive exchange quantity limit is determined, and then it is determined whether the change rate exceeds a preset change threshold; if it exceeds the preset change threshold, the configuration of the operating filter group and the standby filter group in the converter is updated. In this way, the filter in the converter station is configured by determining the filter capacity corresponding to the reactive exchange amount limit, and the configuration is updated according to the actual value of the reactive exchange amount during the operation of the converter station, so that the capacity of the filter configured for the converter station matches the reactive exchange amount of the converter station, and the reactive power consumed by the converter station can be accurately and effectively compensated.

[0060] For further information, please refer to Figure 2Based on the first embodiment of the method for configuring the filter of the present invention, a second embodiment of the method for configuring the filter of the present invention is proposed.

[0061] The difference between the second embodiment of the filter configuration method and the first embodiment of the filter configuration method is that if the change rate exceeds a preset change threshold, the step of updating the configuration of the operating filter group and the standby filter group in the converter includes:

[0062] Step S41, if the change rate exceeds a preset change threshold, determining a change direction corresponding to the change rate;

[0063] Step S42, if the change direction is positive, determining a first filter from each backup filter of the backup filter group according to the change rate, and configuring the first filter to be connected to the operating filter group;

[0064] Step S43: if the change direction is negative, determine a second filter from each operating filter of the operating filter group according to the change rate, and remove the second filter from the operating filter group to configure it as the standby filter group.

[0065] Furthermore, the change of the actual value of the reactive exchange amount relative to the reactive exchange amount limit value includes two directions of increasing and decreasing, and the direction of change is used as the change direction corresponding to the change rate. The change direction corresponding to the change rate is determined according to whether the actual value of the reactive exchange amount is greater than or less than the reactive exchange amount limit value. If the actual value of the reactive exchange amount is greater than the reactive exchange amount limit value, the change direction corresponding to the change rate is determined to be positive; if the actual value of the reactive exchange amount is less than the reactive exchange amount limit value, the change direction corresponding to the change rate is determined to be negative.

[0066] Furthermore, for the positive change direction, the actual value of the reactive exchange amount is greater than the reactive exchange amount limit, which causes the increase in reactive power consumed in the converter station. At this time, it is necessary to increase the total capacity of the operating filter group by increasing the number of filters in the operating filter group, so as to compensate for the increased consumption with a larger total capacity. At this time, according to the increased consumption represented by the rate of change, the first filter is determined from the spare filters of the spare filter group. The capacity corresponding to the first filter is sufficient to compensate for the increased consumption, so the first filter is configured and configured as the operating filter group.

[0067] Furthermore, for the negative change direction, it is caused by the actual value of the reactive exchange amount being less than the reactive exchange amount limit, which is caused by the reduction in reactive power consumed in the converter station. At this time, it is necessary to reduce the total capacity of the operating filter group by reducing the number of filters in the operating filter group, so as to compensate for the reduced consumption with an appropriate total capacity. At this time, based on the reduced consumption represented by the rate of change, a second filter is determined from each operating filter of the operating filter group. The capacity corresponding to the second filter matches the reduced consumption, wherein the match may be that the corresponding capacity is less than or equal to the reduced consumption. The determined second filter is then removed from the operating filter group and configured as a standby filter group. Among them, the removal can be achieved by disconnecting the circuit connection.

[0068] It is understandable that the number of spare filters included in the spare filter group is large, and different spare filters have different capacities, so that there may be multiple spare filters that can compensate for the increased consumption. In this case, the one with the highest matching degree can be screened out from the multiple spare filters as the first filter. Specifically, the step of determining the first filter from the spare filters of the spare filter group according to the change rate includes:

[0069] Step S421, determining whether the change duration corresponding to the change rate is greater than a preset duration, if greater than the preset duration, generating a reactive exchange amount increment between the actual reactive exchange amount value and the reactive exchange amount limit value, and obtaining the standby capacity of each standby filter in the standby filter group;

[0070] Step S422: determining a first filter from each backup filter of the backup filter group according to the reactive exchange amount increment and each backup capacity.

[0071] Furthermore, considering that the increase in the actual value of reactive exchange may be instantaneous, that is, at a certain moment, its value increases greatly, so that its rate of change relative to the reactive exchange limit exceeds the preset change threshold, while the value at other moments does not increase or increases slightly, and does not affect the normal operation of the converter station. Therefore, in order to determine whether the actual value of reactive exchange is an instantaneous increase, the time when the actual value of reactive exchange increases relative to the reactive exchange limit is counted, and the statistically obtained time is used as the change duration corresponding to the change rate. In addition, a preset duration representing the length of time is pre-set, and the statistically obtained change duration is compared with the preset duration to determine whether the change duration is greater than the preset duration. If it is greater than the preset duration, it means that the increase in the actual value of reactive exchange is not instantaneous. On the contrary, if the change duration is less than or equal to the preset duration, it means that the increase in the actual value of reactive exchange is instantaneous, and there is no need to update the configuration of the operating filter group.

[0072] Furthermore, for non-instantaneous increases, the actual value of the reactive exchange amount and the reactive exchange amount limit are differenced to generate a reactive exchange value-added value between the two. In addition, the capacity of each standby filter in the standby filter group is obtained as the standby capacity. Then, based on the matching relationship between the reactive exchange amount value-added and each standby capacity, the first filter is determined from each standby filter in the standby filter group. Specifically, the step of determining the first filter from each standby filter in the standby filter group based on the reactive exchange amount value-added and each standby capacity includes:

[0073] Step S4221, arranging the spare capacities in ascending order, and comparing the reactive exchange amount increments with the spare capacities one by one based on the arrangement order;

[0074] Step S4222, determine whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment; if it is greater than or equal to the reactive exchange amount increment, search the spare filter corresponding to the currently compared spare capacity in each of the spare filters as the first filter.

[0075] Further, the spare capacities are sorted in order from small to large according to their respective values, and the reactive exchange amount increment is compared with each spare capacity one by one according to the arrangement order, and it is judged whether the spare capacity compared each time is greater than or equal to the reactive exchange amount increment. The spare capacity that appears for the first time is greater than or equal to the reactive exchange amount increment. The spare capacity that appears for the first time is closest to the value of the reactive exchange amount increment, and it is used to compensate for the reactive exchange amount increment, which has the least impact on the converter station. Therefore, the spare filter from which the spare capacity comes is found as the first filter. In a specific embodiment, the spare capacities after sorting are A1, A2, A3, A4, A5..., and A1 is compared with the reactive exchange amount increment to determine whether A1 is greater than or equal to the reactive exchange amount increment. If it is greater than or equal, the spare filter from which A1 comes is found as the first filter. If it is less than, A2 is compared with the reactive exchange amount increment to determine whether A2 is greater than or equal to the reactive exchange amount increment. This cycle is repeated until the spare capacity is greater than or equal to the reactive exchange amount increment for the first time.

[0076] Furthermore, it is possible that all the spare capacities are less than the increase in reactive exchange volume, and at this time, all the spare filters are insufficient to compensate for the increase in reactive exchange volume alone. At this time, two or more spare filters need to be selected from the spare filters of the spare filter group to jointly compensate for the increase in reactive exchange volume. Specifically, the step of determining whether the currently compared spare capacity is greater than or equal to the increase in reactive exchange volume includes:

[0077] Step S4223: if it is determined through comparison that all the spare capacities are smaller than the reactive exchange amount increment, then the spare capacities are combined in pairs based on the arrangement order to generate a combination result;

[0078] Step S4224: determining the first filter among the backup filters of the backup filter group according to the size relationship between the combination result and the increased reactive exchange amount.

[0079] Furthermore, after all the arranged spare capacities are compared with the reactive exchange amount increment, and after it is determined through comparison that all spare capacities are less than the reactive exchange amount increment, the spare capacities are combined in pairs according to the arrangement order of the spare capacities. The two-by-two combination can be to combine two adjacent spare capacities; for example, the first and second spare capacities are combined, the second and third spare capacities are combined, the third and fourth spare capacities are combined, etc.; it can also be to combine from both ends of the sorting to the middle, that is, to combine the maximum value with the minimum value, the second largest value with the second smallest value, etc. After the two-by-two combination, multiple combination results are generated.

[0080] Furthermore, according to the size relationship between each combination result and the increase in reactive exchange amount, the first filter is determined from each standby filter of the standby filter group. Moreover, the size relationship between each combination result and the increase in reactive exchange amount is that the combination result is greater than or equal to the increase in reactive exchange amount and is the closest matching relationship to the increase in reactive exchange amount. Similarly, by sorting each combination result in order from small to large, and comparing each combination result after the arrangement order with the increase in reactive exchange amount one by one, the combination result that is greater than the increase in reactive exchange amount for the first time is found. Then, the standby filter corresponding to the combination result is found from the standby filter group as the first filter to be configured as the operating filter group.

[0081] It should be noted that if it is determined through comparison that the combination result after the two-by-two combination is still less than the increase in reactive exchange volume, then the sorted spare capacities are combined in threes and threes, and the combination result is obtained for further comparison and judgment, and it is worthwhile to determine the combination result that is greater than or equal to the increase in reactive exchange volume. In addition, for the second filter, there may also be multiple operating filters in the operating filter group that match the reduced consumption, that is, the capacity of multiple operating filters is less than or equal to the reduced consumption. At this time, it is also necessary to screen out the one with the highest matching degree from the multiple operating filters as the second filter. The screening method can be the same as the first filter, which will not be repeated here.

[0082] In this embodiment, when it is detected that the reactive power consumed by the converter station is too high, so that the actual value of the reactive exchange amount changes too much relative to the reactive exchange amount limit, the first filter or the second filter that best matches the consumption is determined from the operating filter group or the standby filter group, and the configuration of the operating filter group and the standby filter group is updated, thereby achieving compensation for the reactive power consumed by the converter station in the most matching manner, which is conducive to maintaining the normal operation of the converter station.

[0083] For further information, please refer to Figure 3 Based on the first and second embodiments of the filter configuration method of the present invention, a third embodiment of the filter configuration method of the present invention is proposed.

[0084] The difference between the third embodiment of the filter configuration method and the first and second embodiments of the filter configuration method is that the step of determining the filter capacity corresponding to the converter station according to the active power, the commutation parameters, and the reactive exchange amount limit corresponding to the converter station comprises:

[0085] Step S21, calculating a first filter capacity value corresponding to the converter station according to the active power, and the commutation angle and the trigger angle in the commutation parameters;

[0086] Step S22, performing power flow calculation based on the first filter capacity value and the active power to obtain a calculation result, and determining the filter capacity according to the calculation result and the reactive exchange amount limit corresponding to the converter station.

[0087] Furthermore, the control center is pre-set with a calculation formula for generating a first filter capacity value corresponding to the filter. The calculation formula is used to calculate the active power, the commutation angle and the trigger angle in the commutation parameters to obtain the first filter capacity value corresponding to the converter station. The calculation formula can be specifically referred to as the following formula (1).

[0088]

[0089] Wherein, Q1 represents the first filter capacity value, P represents active power, μ represents the commutation angle, and α represents the trigger angle.

[0090] Furthermore, after the first filter capacity value is obtained by calculation, multiple flow calculations are performed on it and the active power to obtain relevant calculation results. Then, the filter capacity is determined based on the calculation results and the reactive exchange limit. Among them, the flow calculation is a method of calculating the distribution of active power, reactive power and voltage in the power grid based on parameter information such as power system network topology, component parameters and power generation and load parameters. In this embodiment, the steps of performing flow calculation based on the first filter capacity value and the active power to obtain the calculation results include:

[0091] Step S221, performing a power flow calculation according to the first filter capacity value and the active power to obtain a first reactive exchange amount corresponding to the converter station and the first filter capacity value;

[0092] Step S222, adding the first filter capacity value and the first reactive exchange amount to obtain a second filter capacity value, and performing secondary power flow calculation according to the second filter capacity value and the active power to obtain a second reactive exchange amount corresponding to the converter station and the second filter capacity value;

[0093] Step S223, adding the second filter capacity value and the second reactive exchange amount to obtain a third filter capacity value, and performing three power flow calculations according to the third filter capacity value and the active power to obtain a third reactive exchange amount corresponding to the third filter capacity value of the converter station;

[0094] Step S224, generating the first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount as calculation results.

[0095] Furthermore, the control center may pre-set a preset algorithm for power flow calculation, such as PSD-BP; A power flow program, Gauss-Seidel iteration method, Newton-Raphson method, PQ decomposition method, etc. Through such preset algorithm, a power flow calculation is performed on the first filter capacity value and the active power to obtain the first reactive exchange amount corresponding to the converter station under the first filter capacity value, and the first filter capacity value and the first reactive exchange amount are added to obtain the second filter capacity value. Then, a second power flow calculation is performed on the second filter capacity value and the active power through the preset algorithm to obtain the second reactive exchange amount corresponding to the converter station under the second filter capacity value, and the second filter capacity value and the second reactive exchange amount are added to obtain the third filter capacity value. The third filter capacity value and the active power are again calculated three times through the preset algorithm to obtain the third reactive exchange amount corresponding to the converter station under the third filter capacity value. The first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount obtained through the three power flow calculations together constitute the calculation result.

[0096] Furthermore, the step of determining the filter capacity according to the calculation result and the reactive exchange amount limit corresponding to the converter station includes:

[0097] Step S225, generating a first parameter, a second parameter and a third parameter according to the first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount;

[0098] Step S226, calculating the first parameter, the second parameter, the third parameter, and the reactive exchange amount limit according to a preset calculation formula to obtain the filter capacity.

[0099] Furthermore, the control center is pre-set with a formula group for generating parameters, and the formula group includes at least three different formulas. The first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount are calculated in different ways through the three formulas to generate the first parameter, the second parameter and the third parameter.

[0100] Furthermore, the control center is also pre-set with a preset calculation formula for calculating the filter capacity, and the filter capacity can be obtained by calculating the first parameter, the second parameter, the third parameter and the reactive exchange amount limit through the preset formula. The preset calculation formula can be specifically referred to as the following formula (2).

[0101]

[0102] Where Qf represents the filter capacity, Q s represents the reactive exchange limit, and a1, a2, and a3 represent the first parameter, the second parameter, and the third parameter respectively.

[0103] This embodiment obtains multiple sets of filter capacity values ​​and reactive exchange quantities through multiple power flow calculations, which are used to generate the first parameter, the second parameter and the third parameter, and then combines the first parameter, the second parameter and the third parameter with the reactive exchange quantity limit to calculate the filter capacity, so that the calculation of the filter capacity is more accurate.

[0104] In addition, an embodiment of the present invention also provides a filter configuration system. Figure 4 , Figure 4 It is a structural diagram of the equipment hardware operating environment involved in the embodiment of the filter configuration system of the present invention.

[0105] like Figure 4As shown, the configuration system of the filter may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a storage 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-Fl interface). The storage 1005 may be a high-speed RAM storage, or a stable storage (non-volatile memory), such as a disk storage. The storage 1005 may also be a storage device independent of the aforementioned processor 1001.

[0106] Those skilled in the art will understand that Figure 4 The hardware structure of the filter configuration system shown in the figure does not constitute a limitation on the filter configuration system, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0107] like Figure 4 As shown, the storage 1005 as a storage medium may include an operating system, a network communication module, a user interface module and a control program. The operating system is a program for managing and controlling the configuration system and software resources of the filter, and supports the operation of the network communication module, the user interface module, the control program and other programs or software; the network communication module is used to manage and control the network interface 1004; the user interface module is used to manage and control the user interface 1003.

[0108] exist Figure 4 In the hardware structure of the filter configuration system shown, the network interface 1004 is mainly used to connect to other system servers and communicate data with other system servers; the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; the processor 1001 can call the control program stored in the storage 1005 and perform the following operations:

[0109] Predicting the active power of the DC transmission system corresponding to the converter station, and obtaining the commutation parameters of the converter in the converter station;

[0110] Determine the filter capacity corresponding to the converter station according to the active power, the commutation parameters, and the reactive exchange amount limit corresponding to the converter station, and configure the operating filter group and the standby filter group in the converter station according to the filter capacity;

[0111] During the operation of the operating filter group, the actual value of the reactive exchange amount corresponding to the converter station is detected to determine whether the change rate of the actual value of the reactive exchange amount relative to the reactive exchange amount limit value exceeds a preset change threshold;

[0112] If the change rate exceeds a preset change threshold, the configuration of the operating filter group and the standby filter group in the converter is updated.

[0113] Furthermore, if the change rate exceeds a preset change threshold, the step of updating the configuration of the operating filter group and the standby filter group in the converter includes:

[0114] If the change rate exceeds a preset change threshold, determining a change direction corresponding to the change rate;

[0115] If the change direction is positive, determining a first filter from each spare filter of the spare filter group according to the change rate, and connecting the first filter configuration to the operating filter group;

[0116] If the change direction is negative, a second filter is determined from each operating filter of the operating filter group according to the change rate, and the second filter is cut off from the operating filter group to be configured as the spare filter group.

[0117] Further, the step of determining the first filter from the backup filters of the backup filter group according to the change rate includes:

[0118] Determine whether the change duration corresponding to the change rate is greater than a preset duration, and if so, generate a reactive exchange amount increment between the actual reactive exchange amount value and the reactive exchange amount limit value, and obtain the standby capacity of each standby filter in the standby filter group;

[0119] According to the reactive exchange amount increment and each of the spare capacities, a first filter is determined from each of the spare filters in the spare filter group.

[0120] Furthermore, the step of determining the first filter from each backup filter of the backup filter group according to the reactive exchange amount increment and each backup capacity comprises:

[0121] Arrange the spare capacities in order from small to large, and compare the reactive exchange amount increments with the spare capacities one by one based on the arrangement order;

[0122] Determine whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment; if so, search the spare filter corresponding to the currently compared spare capacity in each of the spare filters as the first filter.

[0123] Further, after the step of determining whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment, the processor 1001 may call the control program stored in the storage 1005 and perform the following operations:

[0124] If it is determined through comparison that all the reserve capacities are smaller than the reactive exchange amount increment, then the reserve capacities are combined in pairs based on the arrangement order to generate a combination result;

[0125] According to the magnitude relationship between the combination result and the increased reactive exchange amount, the first filter among the backup filters of the backup filter group is determined.

[0126] Furthermore, the step of determining the filter capacity corresponding to the converter station according to the active power, the commutation parameter, and the reactive exchange amount limit corresponding to the converter station includes:

[0127] According to the active power, and the commutation angle and the trigger angle in the commutation parameters, a first filter capacity value corresponding to the converter station is calculated, wherein the calculation formula is:

[0128]

[0129] Wherein, Q1 represents the first filter capacity value, P represents active power, p represents the commutation angle, and α represents the trigger angle;

[0130] A power flow calculation is performed based on the first filter capacity value and the active power to obtain a calculation result, and the filter capacity is determined according to the calculation result and the reactive exchange amount limit corresponding to the converter station.

[0131] Furthermore, the step of performing power flow calculation based on the first filter capacity value and the active power to obtain a calculation result includes:

[0132] Performing a power flow calculation according to the first filter capacity value and the active power to obtain a first reactive exchange amount corresponding to the converter station and the first filter capacity value;

[0133] The first filter capacity value and the first reactive exchange amount are added to obtain a second filter capacity value, and a secondary power flow calculation is performed according to the second filter capacity value and the active power to obtain a second reactive exchange amount corresponding to the converter station and the second filter capacity value;

[0134] The second filter capacity value and the second reactive exchange amount are added to obtain a third filter capacity value, and three power flow calculations are performed according to the third filter capacity value and the active power to obtain a third reactive exchange amount corresponding to the third filter capacity value of the converter station;

[0135] The first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount are generated as calculation results.

[0136] Furthermore, the step of determining the filter capacity according to the calculation result and the reactive exchange amount limit corresponding to the converter station includes:

[0137] Generate a first parameter, a second parameter and a third parameter according to the first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount;

[0138] According to a preset calculation formula, the first parameter, the second parameter, the third parameter, and the reactive exchange amount limit are calculated to obtain the filter capacity, and the preset calculation formula is:

[0139]

[0140] Where Qf represents the filter capacity, Q s represents the reactive exchange limit, and a1, a2, and a3 represent the first parameter, the second parameter, and the third parameter respectively.

[0141] The specific implementation of the filter configuration system of the present invention is basically the same as the above-mentioned filter configuration method embodiments, and will not be described in detail here.

[0142] The embodiment of the present invention further provides a storage medium having a control program stored thereon, and the control program, when executed by a processor, implements the steps of the filter configuration method described above.

[0143] The storage medium of the present invention may be a computer-readable storage medium, and its implementation method is substantially the same as the above-mentioned filter configuration method embodiments, which will not be described in detail herein.

[0144] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims. All equivalent structures or equivalent process changes made using the contents of the specification and drawings of the present invention, or directly or indirectly used in other related technical fields, are protected by the present invention.

Claims

1. A filter configuration method, applied to a converter station, characterized in that: The filter configuration method includes: Predicting the active power of the DC transmission system corresponding to the converter station, and obtaining the commutation parameters of the converter in the converter station; Determine the filter capacity corresponding to the converter station according to the active power, the commutation parameters, and the reactive exchange amount limit corresponding to the converter station, and configure the operating filter group and the standby filter group in the converter station according to the filter capacity; During the operation of the operating filter group, the actual value of the reactive exchange amount corresponding to the converter station is detected to determine whether the change rate of the actual value of the reactive exchange amount relative to the reactive exchange amount limit value exceeds a preset change threshold; If the change rate exceeds a preset change threshold, the configuration of the operating filter group and the standby filter group in the converter is updated.

2. The filter configuration method according to claim 1, characterized in that: If the change rate exceeds a preset change threshold, the step of updating the configuration of the operating filter group and the standby filter group in the converter comprises: If the change rate exceeds a preset change threshold, determining a change direction corresponding to the change rate; If the change direction is positive, determining a first filter from each spare filter of the spare filter group according to the change rate, and connecting the first filter configuration to the operating filter group; If the change direction is negative, a second filter is determined from each operating filter of the operating filter group according to the change rate, and the second filter is cut off from the operating filter group to be configured as the spare filter group.

3. The filter configuration method according to claim 2, characterized in that: The step of determining the first filter from the backup filters of the backup filter group according to the change rate comprises: Determine whether the change duration corresponding to the change rate is greater than a preset duration, and if so, generate a reactive exchange amount increment between the actual reactive exchange amount value and the reactive exchange amount limit value, and obtain the standby capacity of each standby filter in the standby filter group; According to the reactive exchange amount increment and each of the spare capacities, a first filter is determined from each of the spare filters in the spare filter group.

4. The filter configuration method according to claim 3, characterized in that: The step of determining the first filter from each backup filter of the backup filter group according to the reactive exchange amount increment and each backup capacity comprises: Arrange the spare capacities in order from small to large, and compare the reactive exchange amount increments with the spare capacities one by one based on the arrangement order; Determine whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment; if so, search the spare filter corresponding to the currently compared spare capacity in each of the spare filters as the first filter.

5. The filter configuration method according to claim 4, characterized in that: After the step of judging whether the currently compared spare capacity is greater than or equal to the reactive exchange amount increment, the following steps are included: If it is determined through comparison that all the reserve capacities are smaller than the reactive exchange amount increment, then the reserve capacities are combined in pairs based on the arrangement order to generate a combination result; According to the magnitude relationship between the combination result and the increased reactive exchange amount, the first filter among the backup filters of the backup filter group is determined.

6. The filter configuration method according to any one of claims 1 to 5, characterized in that: The step of determining the filter capacity corresponding to the converter station according to the active power, the commutation parameter, and the reactive exchange amount limit corresponding to the converter station comprises: According to the active power, and the commutation angle and the trigger angle in the commutation parameters, a first filter capacity value corresponding to the converter station is calculated, wherein the calculation formula is: Wherein, Q1 represents the first filter capacity value, P represents active power, μ represents the commutation angle, and α represents the trigger angle; A power flow calculation is performed based on the first filter capacity value and the active power to obtain a calculation result, and the filter capacity is determined according to the calculation result and the reactive exchange amount limit corresponding to the converter station.

7. The filter configuration method according to claim 6, characterized in that: The step of performing power flow calculation based on the first filter capacity value and the active power to obtain a calculation result comprises: Performing a power flow calculation according to the first filter capacity value and the active power to obtain a first reactive exchange amount corresponding to the converter station and the first filter capacity value; The first filter capacity value and the first reactive exchange amount are added to obtain a second filter capacity value, and a secondary power flow calculation is performed according to the second filter capacity value and the active power to obtain a second reactive exchange amount corresponding to the converter station and the second filter capacity value; The second filter capacity value and the second reactive exchange amount are added to obtain a third filter capacity value, and three power flow calculations are performed according to the third filter capacity value and the active power to obtain a third reactive exchange amount corresponding to the third filter capacity value of the converter station; The first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount are generated as calculation results.

8. The filter configuration method according to claim 7, characterized in that: The step of determining the filter capacity according to the calculation result and the reactive exchange amount limit corresponding to the converter station comprises: Generate a first parameter, a second parameter and a third parameter according to the first filter capacity value, the first reactive exchange amount, the second filter capacity value, the second reactive exchange amount, the third filter capacity value and the third reactive exchange amount; According to a preset calculation formula, the first parameter, the second parameter, the third parameter, and the reactive exchange amount limit are calculated to obtain the filter capacity, and the preset calculation formula is: Where Qf represents the filter capacity, Q s represents the reactive exchange limit, and a1, a2, and a3 represent the first parameter, the second parameter, and the third parameter respectively.

9. A filter configuration system, characterized in that: The filter configuration system includes a memory, a processor, a communication bus, and a control program stored in the memory: The communication bus is used to realize the connection and communication between the processor and the storage; The processor is used to execute the control program to implement the steps of the filter configuration method according to any one of claims 1-8.

10. A storage medium, characterized in that: The storage medium stores a control program, and when the control program is executed by the processor, the steps of the filter configuration method according to any one of claims 1 to 8 are implemented.

Images