Parameter configuration method of reactive power compensation system, control device and reactive power compensation system

Abstract

The present disclosure provides a parameter configuration method, control device and reactive compensation system for a reactive compensation system. The control device obtains the current first reactive power and first power factor of the power grid, and sequentially controls at least one capacitor to be put into the power grid respectively, until the difference between the current second power factor of the power grid and the first power factor is greater than the preset difference threshold, stops putting at least one capacitor into the power grid, and obtains the current second reactive power of the power grid, obtains the total capacity value of the capacitor currently put into the power grid, obtains the proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value, and configures the primary transformer based on the proportional value of the primary transformer. In this way, the parameters of the reactive compensation system can be automatically set without manual setting, avoiding reactive compensation errors caused by manual setting errors, improving the ease of use of the system, and also improving the safety of the system, providing guarantee for the normal operation of the system.

Description

Technical Field

[0001] The present disclosure relates to the technical field of reactive power compensation, and in particular to a parameter configuration method, a control device and a reactive power compensation system of a reactive power compensation system. Background Art

[0002] When using the reactive power compensation system, users need to set relevant configuration parameters and protection parameters according to actual working conditions. Generally, based on the professionalism of the reactive power compensation system, users use default parameters to set the reactive power compensation system so that the reactive power compensation system can operate normally.

[0003] Among them, the primary transformer in the reactive compensation system is usually inconsistent with the default primary transformer ratio value in the reactive compensation controller, and the user needs to configure it according to the actual rated current output by the transformer.

[0004] However, the primary transformer ratio value is extremely important to the compensation system. There is a possibility of setting errors when the user sets it, and setting errors will directly lead to the entire reactive power compensation working incorrectly. Summary of the invention

[0005] The present disclosure provides a parameter configuration method, a control device and a reactive compensation system for a reactive compensation system, so as to solve the problem that users are prone to errors when manually setting reactive compensation parameters.

[0006] In a first aspect, the present disclosure provides a parameter configuration method for a reactive power compensation system, the method comprising:

[0007] Obtaining a first reactive power and a first power factor of a current power grid;

[0008] Controlling at least one capacitor to be put into the power grid in sequence, respectively, until the difference between the current second power factor of the power grid and the first power factor is greater than a preset difference threshold, stopping putting the at least one capacitor into operation, and obtaining the current second reactive power of the power grid;

[0009] Obtaining the total capacity value of the capacitors currently put into the power grid;

[0010] Obtaining a proportional value of a primary transformer according to the first reactive power, the second reactive power and the total capacity value;

[0011] Based on the proportional value of the primary transformer, the primary transformer is configured.

[0012] In some embodiments, obtaining a proportional value of a primary transformer according to the first reactive power, the second reactive power and the total capacity value includes:

[0013] The proportional value of the primary transformer is obtained according to the following formula:

[0014]

[0015] Where K is the proportional value of the primary transformer; C 实 is the total capacity value; Q1 is the first reactive power; Q2 is the second reactive power.

[0016] In some embodiments, sequentially controlling at least one capacitor to be respectively put into the power grid until the difference between the current second power factor of the power grid and the first power factor is greater than a preset difference threshold, stopping putting the at least one capacitor into use, and obtaining the current second reactive power of the power grid includes:

[0017] Controlling one of the at least one capacitor that is not put into the power grid to be put into the power grid;

[0018] Acquire a current third power factor of the power grid;

[0019] Determining whether a difference between the third power factor and the first power factor is greater than the preset difference threshold;

[0020] If the difference between the third power factor and the first power factor is greater than the preset difference threshold, stop putting the at least one capacitor into operation and use the third power factor as the second power factor;

[0021] If the difference between the third power factor and the first power factor is less than or equal to the preset difference threshold, the method returns to executing the control to put the capacitor of the at least one capacitor that is not put into the power grid into the power grid.

[0022] In some embodiments, obtaining the total capacity value of capacitors currently put into the power grid includes:

[0023] Obtaining the total rated capacity of capacitors currently put into the power grid;

[0024] The total capacity value is obtained according to the total rated capacity, the effective value of the voltage of the power grid and the rated voltage value of each capacitor.

[0025] In some embodiments, configuring the primary transformer based on the proportional value of the primary transformer includes:

[0026] Rounding the proportional value of the primary mutual inductor to obtain a proportional parameter value of the primary mutual inductor;

[0027] The primary transformer is configured according to the proportional parameter value of the primary transformer.

[0028] In some embodiments, the rounding of the proportional value of the primary transformer to obtain the proportional parameter value of the primary transformer includes:

[0029] If the proportional value of the primary transformer is less than or equal to 10, the proportional value of the primary transformer is rounded off to obtain a proportional parameter value of the primary transformer;

[0030] If the proportional value of the primary transformer is greater than 10 and less than or equal to 100, then obtain a value that is closest to the proportional value of the primary transformer and is an integer multiple of 5 to obtain the proportional parameter value of the primary transformer;

[0031] If the proportional value of the primary transformer is greater than 100 and less than or equal to 1000, then obtain a value that is closest to the proportional value of the primary transformer and is an integer multiple of 50 to obtain the proportional parameter value of the primary transformer;

[0032] If the proportional value of the primary transformer is greater than 1000, a value that is closest to the proportional value of the primary transformer and is an integer multiple of 500 is obtained to obtain the proportional parameter value of the primary transformer.

[0033] In some embodiments, after obtaining the proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value, the method further includes:

[0034] Cut off all capacitors connected to the power grid;

[0035] Return to executing the step of obtaining the current first reactive power and the first power factor of the power grid, until there are M primary transformer ratio values ​​among the obtained N consecutive primary transformer ratio values, and the difference between the two is less than the preset ratio threshold, then obtain the average ratio value according to the average value of the ratio values ​​of the M primary transformers; N is an integer greater than 1; M is an integer greater than 1, and M is less than N;

[0036] The configuring the primary transformer based on the proportional value of the primary transformer comprises:

[0037] Based on the average ratio value, the primary transformer is configured.

[0038] In a second aspect, an embodiment of the present disclosure provides a control device, including a memory and a processor, wherein the memory stores a computer program that can be executed on the processor, and when the processor executes the program, the method described in the first aspect is implemented.

[0039] In a third aspect, the present disclosure provides a reactive power compensation system, which includes a control device and at least one capacitor, wherein the control device is respectively connected to the at least one capacitor; the control device is connected to a primary transformer; and the control device is used to implement the method described in the first aspect above.

[0040] In a fourth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, which implements the method described in the first aspect when executed by a processor.

[0041] The parameter configuration method, control device and reactive compensation system of the reactive compensation system provided by the embodiment of the present disclosure, the control device obtains the current first reactive power and first power factor of the power grid, controls at least one capacitor to be put into the power grid respectively in sequence, until the difference between the current second power factor of the power grid and the first power factor is greater than the preset difference threshold, stops putting at least one capacitor into the power grid, obtains the current second reactive power of the power grid, obtains the total capacity value of the capacitor currently put into the power grid, obtains the proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value, and configures the primary transformer based on the proportional value of the primary transformer. The control device sequentially puts capacitors into the power grid, stops putting capacitors into the power grid when the power factor of the power grid is greatly different from the power factor of the power grid when the capacitor is not put into the power grid, obtains the proportional value of the primary transformer by the parameters of the current power grid and the parameters of the power grid when the capacitor is not put into the power grid, and configures the primary transformer accordingly, so that the parameters of the reactive compensation system can be automatically set, and manual setting is not required, avoiding reactive compensation errors caused by manual setting errors, improving the ease of use of the system, and also improving the safety of the system, providing guarantee for the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A topological diagram of a reactive power compensation system provided by an embodiment of the present disclosure;

[0043] Figure 2 A schematic flow chart of a parameter configuration method for a reactive power compensation system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0045] In the present disclosure, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a alone, b alone, or c alone can mean: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present disclosure and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present disclosure.

[0047] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure may refer to not only a physical connection, but also an electrical connection or a signal connection. For example, it may be a direct connection, i.e. a physical connection, or it may be an indirect connection through at least one intermediate element, as long as the circuit is connected. It may also be the internal connection of two elements. In addition to signal connection through a circuit, signal connection may also refer to signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure may be understood according to specific circumstances.

[0048] The present disclosure provides a parameter configuration method for a reactive power compensation system, which is applied to the reactive power compensation system. Figure 1 The reactive power compensation system provided by the embodiment of the present disclosure is introduced.

[0049] See also Figure 1 , Figure 1 This is a topological diagram of a reactive power compensation system provided in an embodiment of the present disclosure. The reactive power compensation system of this embodiment is applied to a power grid. Hereinafter, the power grid that needs reactive power compensation is referred to as a power grid. The power grid can be as follows: Figure 1 The three-phase three-wire power grid shown in Figure 1 A three-phase three-wire power grid is used as an example for explanation, which does not constitute a limitation to the present disclosure.

[0050] The reactive power compensation system of this embodiment includes: a control device and at least one capacitor, wherein the control device can also be called a reactive power compensation controller. Capacitors can also be called capacitors, capacitor banks, smart capacitors, etc. In practical applications, the number of capacitors can be set accordingly according to the actual situation on site. Figure 1 exemplarily shows capacitor 1, capacitor 2, ... capacitor N, Figure 1 The above is only an example and does not constitute a limitation on the number of the at least one capacitor in the present disclosure. Each of the at least one capacitor is connected to the power grid, and the control device is connected to the at least one capacitor. The control device can connect or disconnect the capacitor to the power grid by controlling the relay inside the capacitor. Figure 1 It is shown in the figure as an example: the control device is connected to the port RJ45-B of capacitor 1 through the COM port, the port RJ45-A of capacitor 1 is connected to the port RJ45-B of capacitor 2, ... the port RJ45-A of capacitor N-1 is connected to the port RJ45-B of capacitor N. It can be understood that in order to facilitate on-site wiring, the port RJ45-A of each capacitor is actually short-circuited with the port RJ45-B of the capacitor. For example, the port RJ45-A of capacitor 1 is short-circuited with the port RJ45-B of capacitor 1, so that the controller is connected to the capacitors respectively, Figure 1 The connection manner between the controller and at least one capacitor is only an example and does not constitute a limitation to the present disclosure.

[0051] The control device is connected to the primary transformer, and the control device sets the parameters of the primary transformer internally, so that the reactive power compensation system and the primary transformer can jointly realize reactive power compensation for the power grid.

[0052] The parameter configuration method of the reactive power compensation system provided by the embodiment of the present disclosure controls the device to sequentially put capacitors into the power grid, and when the power factor of the power grid is greatly different from the power factor of the power grid when no capacitors are put into the power grid, stops putting capacitors into the power grid, obtains the proportional value of the primary transformer through the parameters of the current power grid and the parameters of the power grid when no capacitors are put into the power grid, and configures the primary transformer accordingly. Thus, the parameters of the reactive power compensation system can be automatically set without manual setting, thereby avoiding reactive power compensation errors caused by manual setting errors, improving the usability of the system, and also improving the safety of the system, providing guarantee for the normal operation of the system.

[0053] The technical solution of the present disclosure is described in detail below with reference to specific embodiments.

[0054] See also Figure 2 , Figure 2A flow chart of a parameter configuration method for a reactive power compensation system provided in an embodiment of the present disclosure. The method provided in this embodiment can be applied to a reactive power compensation system, which can be the reactive power compensation system described above. Figure 1 The reactive power compensation system in the embodiment shown. Figure 2 As shown, the method provided in this embodiment is executed by a control device, which may be a controller or a processor. Figure 1 The control device in the reactive power compensation system is shown. The method provided in this embodiment may include the following steps 201 to 205.

[0055] Step 201: Obtain a first reactive power and a first power factor of a current power grid.

[0056] When the capacitor in the reactive power compensation system is not put into the power grid, the control device obtains the current first reactive power and first power factor of the power grid. The control device can directly obtain the current first reactive power and first power factor, or the control device can calculate the first reactive power and first power factor through the measurement value of the current power grid.

[0057] Exemplarily, in a possible implementation of step 201, the control device can measure the voltage and current of the power grid to obtain the real-time value of the voltage and the real-time value of the current, so that the current first reactive power and first power factor of the power grid can be obtained through the real-time value of the voltage and the real-time value of the current.

[0058] In another possible implementation of step 201, the control device obtains the real-time value of the voltage of the power grid through a voltage measuring device connected thereto, and obtains the real-time value of the current of the power grid through a current measuring device connected thereto, so that the current first reactive power and first power factor of the power grid can be obtained through the real-time value of the voltage and the real-time value of the current.

[0059] In another possible implementation of step 201, the control device directly obtains the current first reactive power and first power factor of the power grid through a device connected thereto.

[0060] Step 202: sequentially control at least one capacitor to be put into the grid until the difference between the current second power factor of the grid and the first power factor is greater than a preset difference threshold, stop putting at least one capacitor into the grid, and obtain the current second reactive power of the grid.

[0061] The preset difference threshold is a preset positive number. The preset difference threshold can be used to determine whether the difference between the power factor when the capacitor is put into use and when the capacitor is not put into use is within a preset range.

[0062] The reactive power compensation system usually includes capacitors, and the reactive power compensation system usually has one or more capacitors. The reactive power compensation system can achieve reactive power compensation by controlling the switching of capacitors. The control device controls at least one capacitor to be put into the power grid in sequence. Each time the capacitor is put into the power grid, the current second power factor of the power grid is obtained. If the difference between the second power factor and the first power factor when no capacitor is put into the power grid is greater than the preset difference threshold, the capacitor is stopped from being put into the power grid. The current second reactive power of the power grid is obtained.

[0063] Step 203: Obtain the total capacity value of the capacitors currently connected to the power grid.

[0064] According to the capacity of each capacitor currently put into the power grid, the total capacity value of the capacitor currently put into the power grid can be obtained.

[0065] Step 204: Obtain a proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value.

[0066] Step 205: configure the primary transformer based on the proportional value of the primary transformer.

[0067] The proportional value of the primary transformer can be used as the transformation ratio of the primary transformer.

[0068] In this embodiment, the control device obtains the current first reactive power and first power factor of the power grid, and sequentially controls at least one capacitor to be put into the power grid respectively, until the difference between the current second power factor of the power grid and the first power factor is greater than the preset difference threshold, stops putting at least one capacitor into the power grid, and obtains the current second reactive power of the power grid, obtains the total capacity value of the capacitor currently put into the power grid, obtains the proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value, and configures the primary transformer based on the proportional value of the primary transformer. The control device sequentially puts capacitors into the power grid, stops putting capacitors into the power grid when the power factor of the power grid is significantly different from the power factor of the power grid when the capacitor is not put into the power grid, obtains the proportional value of the primary transformer by the parameters of the current power grid and the parameters of the power grid when the capacitor is not put into the power grid, and configures the primary transformer accordingly, so that the parameters of the reactive compensation system can be automatically set, without manual setting, avoiding reactive compensation errors caused by manual setting errors, improving the ease of use of the system, and also improving the safety of the system, providing guarantee for the normal operation of the system.

[0069] In some embodiments, step 202 can be implemented through the following steps 2021-2024.

[0070] Step 2021: Control one of the at least one capacitor that is not connected to the grid to connect it to the grid.

[0071] Step 2022: Obtain the current third power factor of the power grid.

[0072] Step 2023: Determine whether the difference between the third power factor and the first power factor is greater than a preset difference threshold.

[0073] If yes, continue to execute step 2024; if no, return to execute step 2021.

[0074] Step 2024: stop inputting at least one capacitor, and use the third power factor as the second power factor.

[0075] In this embodiment, each time a capacitor is put into the power grid, the third power factor of the power grid after the capacitor is put into the power grid is obtained. It should be noted that the capacitor mentioned here can be a capacitor, or a capacitor group composed of multiple capacitors, etc. After each capacitor is put into the power grid, it is determined whether the difference between the third power factor and the first power factor is greater than the preset difference threshold. If the difference between the third power factor and the first power factor is greater than the preset difference threshold, the operation of putting the capacitor into the power grid is stopped, and the third power factor is used as the second power factor for the subsequent calculation of the proportional value of the primary transformer. If the difference between the third power factor and the first power factor is not greater than the preset difference threshold, it is necessary to continue to put in a capacitor and repeat the above process until the difference between the third power factor and the first power factor is greater than the preset difference threshold. Thus, the relevant amount when the difference between the third power factor and the first power factor is greater than the preset difference threshold is obtained, which is used for the calculation of the proportional value of the subsequent primary transformer.

[0076] In some embodiments, step 203 may be implemented by steps 2031 and 2032 as follows.

[0077] Step 2031: Obtain the total rated capacity of the capacitors currently connected to the power grid.

[0078] Furthermore, the total rated capacity can be obtained by the following formula (1).

[0079] =C1+C2+……+Cn Formula (1)

[0080] in, is the total rated capacity of the capacitors currently connected to the grid; C1 is the rated capacity of the first capacitor connected to the grid, C2 is the rated capacity of the second capacitor connected to the grid, ..., Cn is the rated capacity of the nth capacitor connected to the grid.

[0081] Step 2032: Obtain a total capacity value according to the total rated capacity, the effective value of the voltage of the power grid and the rated voltage value of each capacitor.

[0082] The effective value of the voltage of the power grid refers to the effective value of the voltage of the power grid when the capacitor is not put into use. Exemplarily, the current effective value of the voltage of the power grid can be obtained at the same time in step 201 as the effective value of the voltage of the power grid.

[0083] The rated voltage value of each capacitor refers to the rated voltage value of each capacitor in the reactive power compensation system. It should be noted that, usually in the reactive power compensation system, the rated voltages of multiple capacitors are the same.

[0084] The total capacity value is the capacity value obtained by converting the total rated capacity to the current voltage. The total capacity value can also be called the actual capacity value.

[0085] Furthermore, in step 2032, the total capacity value can be obtained by the following formula (2).

[0086] Formula (2)

[0087] in, C Real is the total capacity value of the capacitors currently connected to the power grid; U1 It is the effective value of the voltage when no capacitor is put into the power grid; U amount is the rated voltage of at least one capacitor; C Total It is the total rated capacity of the capacitors currently connected to the power grid.

[0088] In this embodiment, the method for obtaining the total capacity value is simple, so that the proportional value of the primary transformer can be quickly obtained, which is conducive to quickly setting the proportional value of the primary transformer.

[0089] In some embodiments, there is usually K*Q1- =K*Q2, where K is the proportional value of the primary transformer; is the total capacity of the capacitors currently connected to the grid; Q1 is the first reactive power; Q2 is the second reactive power. , Q1 and Q2, and obtain K, that is, step 204 can be obtained by the following formula (3).

[0090] Formula (3)

[0091] Where K is the proportional value of the primary transformer; C 实 is the total capacity value of the capacitors currently connected to the power grid; Q1 is the first reactive power; Q2 is the second reactive power.

[0092] In some embodiments, step 205 may be implemented by steps 2051 and 2052 as follows.

[0093] Step 2051, rounding the proportional value of the primary transformer to obtain the proportional parameter value of the primary transformer.

[0094] Since the ratio value of the physical primary transformer is an integer and has a certain multiplier step, the ratio value of the primary transformer obtained above does not necessarily meet the condition that the actual ratio value of the primary transformer is an integer. Therefore, it is necessary to perform secondary processing on the obtained ratio value of the primary transformer, that is, to perform rounding processing to obtain a value that meets the ratio value of the physical primary transformer. Among them, rounding processing refers to obtaining a corresponding integer as the ratio parameter value of the primary transformer according to the ratio value of the primary transformer in a preset manner.

[0095] Further, for the rounding process in step 2051, different proportional value intervals can be set according to the actual proportional value of the primary transformer, and the proportional value of the primary transformer is processed in the corresponding proportional value interval according to the proportional value interval to which the proportional value of the primary transformer obtained above belongs, so as to obtain the proportional parameter value of the primary transformer. Exemplarily, step 2051 can be implemented by the following steps 20511-20514.

[0096] Step 20511: If the proportional value of the primary transformer is less than or equal to 10, the proportional value of the primary transformer is rounded to obtain the proportional parameter value of the primary transformer.

[0097] Step 20512: If the proportional value of the primary transformer is greater than 10 and less than or equal to 100, obtain the value that is closest to the proportional value of the primary transformer and is an integer multiple of 5 to obtain the proportional parameter value of the primary transformer.

[0098] Step 20513: If the proportional value of the primary transformer is greater than 100 and less than or equal to 1000, obtain the value that is closest to the proportional value of the primary transformer and is an integer multiple of 50 to obtain the proportional parameter value of the primary transformer.

[0099] Step 20514: If the proportional value of the primary transformer is greater than 1000, obtain the value that is closest to the proportional value of the primary transformer and is an integer multiple of 500 to obtain the proportional parameter value of the primary transformer.

[0100] In this embodiment, if the proportional value of the primary transformer is in the range of 0 to 10, the proportional value of the primary transformer is rounded off to a positive integer of 1 to 10 to obtain the proportional parameter value of the primary transformer. If the proportional value of the primary transformer is in the range of 10 to 100, the integer multiple value of 5 closest to the proportional value of the primary transformer is taken as the proportional parameter value of the primary transformer. If the proportional value of the primary transformer is in the range of 100 to 1000, the integer multiple value of 50 closest to the proportional value of the primary transformer is taken as the proportional parameter value of the primary transformer. If the proportional value of the primary transformer is greater than 1000, the integer multiple value of 500 closest to the proportional value of the primary transformer is taken as the proportional parameter value of the primary transformer.

[0101] Step 2052: configure the primary transformer with the proportional parameter value of the primary transformer.

[0102] The proportional parameter value of the primary transformer is used as the transformation ratio of the primary transformer.

[0103] In this embodiment, the proportional value of the primary transformer obtained above is rounded to obtain a proportional value that conforms to the actual primary transformer, that is, the proportional parameter value of the primary transformer. The proportional parameter value of the primary transformer is used as the transformation ratio of the primary transformer, so that the transformation ratio of the set primary transformer is more in line with the actual situation.

[0104] In some scenarios, the load in the power grid changes dynamically, so the ratio value of the primary transformer obtained by the above steps 201-205 may not be accurate enough. Therefore, the above steps 201-204 can be repeated multiple times to obtain the ratio values ​​of multiple primary transformers, so as to obtain a more accurate ratio value of the primary transformer according to the ratio values ​​of multiple primary transformers, and configure the primary transformer. The following is a detailed description with a specific embodiment.

[0105] On the basis of the above embodiment, further, after step 204, the following steps 206 to 208 may be included. Accordingly, step 205 may be implemented by the following step 205a.

[0106] Step 206: disconnect all capacitors connected to the power grid.

[0107] Step 207: Determine whether there are M primary transformer ratio values ​​among the obtained N consecutive primary transformer ratio values, and the difference between any two of them is less than a preset ratio threshold.

[0108] If yes, continue to execute step 208; if no, return to execute step 201.

[0109] The preset ratio threshold is a preset value.

[0110] Wherein, N is an integer greater than 1; M is an integer greater than 1, and M is less than N. For example, N can be 3, and correspondingly, M can be 2; or, N can be 5, and correspondingly, M can be 3. The values ​​of N and M can be set according to actual conditions, and are not limited in the present disclosure.

[0111] Step 208: Obtain an average ratio value according to the average ratio value of the M primary transformers.

[0112] Step 205a: Based on the average ratio value, configure the primary transformer.

[0113] In this embodiment, after executing step 204 to obtain a ratio value of a primary transformer, all capacitors put into the power grid in the above step 202 are removed, and it is determined whether there are M ratio values ​​of primary transformers among the currently obtained N consecutive ratio values ​​of primary transformers, and the difference between the two is less than the preset ratio threshold, wherein the difference between the two refers to the difference between any two of the M ratio values ​​of primary transformers. If there are M ratio values ​​of primary transformers among the currently obtained N consecutive ratio values ​​of primary transformers, and the difference between the two is less than the preset ratio threshold, the average value of the ratio values ​​of the M primary transformers is used as the transformation ratio of the primary transformer. If there are no M ratio values ​​of primary transformers among the currently obtained N consecutive ratio values ​​of primary transformers, and the difference between the two is less than the preset ratio threshold, the process returns to execute step 201, that is, capacitors are continuously put into the process, and the ratio value of the primary transformer is obtained. Thus, the situation that the load in the power grid is dynamically changing is fully considered, and the transformation ratio of the primary transformer is calculated, so that the transformation ratio of the primary transformer obtained is more accurate.

[0114] The parameter configuration method of the reactive power compensation system provided by the embodiment of the present disclosure is described below with a specific example. It should be understood that this example does not constitute a limitation of the present disclosure.

[0115] The method of this example can be applied in Figure 1 In the three-phase three-wire system, a reactive compensation system is shown, wherein a reactive compensation controller and a plurality of intelligent capacitors form a reactive compensation system. The reactive compensation controller is used to calculate the effective value of the grid voltage, the effective value of the current, the reactive power, the active power, the power factor, etc., and is used to operate the switching strategy of the overall reactive compensation system. The plurality of capacitor groups are respectively capacitor groups with a rated voltage of U and a capacity of C1, C2, ... and Cn. The method of this example comprises the following steps.

[0116] Step 1: The reactive power compensation controller collects the current external voltage signal and current signal in real time, and calculates the reactive power Q1, power factor PF1, and voltage effective value U1 of the current power grid system through the real-time values ​​of voltage and current in a voltage cycle of 20 milliseconds (under the condition of 50Hz industrial frequency power supply).

[0117] Step 2: The reactive power compensation controller controls the switching of capacitors in the reactive power compensation system, puts a capacitor C1 into operation, and calculates the current system power factor PF2 again.

[0118] Step 3: Calculate the difference between the power factor PF2 and the power factor PF1.

[0119] Step 4: Determine whether the difference (PF2-PF1) is greater than a preset power factor difference δPF.

[0120] If yes, continue to step 5; if no, return to step 2.

[0121] Step 5: Capacitor input is complete. Continue to step 6.

[0122] If the difference (PF2-PF1) is greater than the preset power factor difference δPF, the capacitor input is terminated.

[0123] If the difference (PF2-PF1) is less than the preset power factor difference δPF, capacitors C2 to Cn are continuously added, the power factor calculation is continuously performed, and step 4 is continuously performed until the current grid PF value meets the requirements.

[0124] Step 6: Calculate the reactive power Q2 under the current PF2 state.

[0125] Step 7: Calculate the total rated capacity of the capacitor bank that has been put into use =C1+C2+……+Cn, the rated capacity Ctotal is converted to the capacity value under the current voltage through the following formula, recorded as Cactual:

[0126]

[0127] Step 8: Calculate the ratio of the primary transformer. Assume that the ratio of the primary transformer is K, then K*Q1 – =K*Q2, so K is obtained by the following formula: K .

[0128] Step 9: Because the ratios of physical transformers are all integers and have certain multiplication steps, the calculated K value needs to be rounded.

[0129] The rounding method is as follows: if K is in the range of 0 to 10, round it to a positive integer from 1 to 10; if the value is between 10 and 100, take the integer multiple of 5 closest to the K value; if the value is between 100 and 1000, take the integer multiple of 50 closest to the K value; if it is greater than 1000, take the integer multiple of 500 closest to the K value; the value is recorded as K real, that is, the external primary transformer ratio.

[0130] Step 10. After completing the above steps, cut off all the capacitor groups, and then execute steps 2 to 9 for multiple times. After multiple calculations, if the calculated real values ​​of K are repeated, then the calculated transformation ratio value is finally determined to be the primary transformer transformation ratio.

[0131] Because the load in the power grid changes dynamically, there may be changes in the load itself before and after executing the above capacitor input step. Therefore, it is necessary to remove all the capacitor groups after completing the above steps, and then execute steps 2 to 9 multiple times. After multiple calculations, if the calculated real values ​​of K are repeated, then the calculated transformation ratio value is finally determined to be the primary transformer ratio.

[0132] In this embodiment, a reactive power compensation system is formed by a controller and multiple intelligent capacitors; it is used for reactive power compensation at industrial power distribution sites. The controller reads the real-time values ​​of the grid voltage and current, calculates the current voltage effective value, current effective value, reactive power, power factor and other parameters, the controller sends an input instruction to the capacitor group, and puts one or more capacitors into the grid. The reactive power compensation controller reads the real-time values ​​of the grid voltage and current after the capacitor is put into the grid again, calculates the current voltage effective value, current effective value, reactive power, and the controller calculates the primary transformer ratio based on the reactive power of the grid calculated before and after the capacitor is put into the grid and the capacitance of the capacitor put into the grid in the middle. By switching one or more capacitors in the system, and then reading the change in the reactive power of the grid before and after the capacitor is put into the grid, the current system primary side current transformer ratio is calculated, which is used for subsequent calculations by the controller. This saves the user from setting the parameter, and also reduces the system error caused by the parameter setting error.

[0133] The present disclosure provides a control device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the program, the steps of the method of any of the above embodiments are implemented.

[0134] The present disclosure provides a reactive power compensation system, which includes a control device and at least one capacitor, wherein the control device is connected to the at least one capacitor respectively; the control device is connected to a primary transformer; and the control device is used to implement the steps of the method as in any of the above embodiments.

[0135] Based on the parameter configuration method of the reactive power compensation system described in any of the above embodiments, the embodiment of the present disclosure further provides a computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc. The storage medium stores computer instructions for executing the parameter configuration method of the reactive power compensation system described in any of the above embodiments, which will not be described in detail here.

[0136] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0137] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

Claims

1. A parameter configuration method for a reactive power compensation system, characterized in that: The method comprises: Obtaining a first reactive power and a first power factor of a current power grid; Controlling at least one capacitor to be put into the power grid in sequence, respectively, until the difference between the current second power factor of the power grid and the first power factor is greater than a preset difference threshold, stopping putting the at least one capacitor into operation, and obtaining the current second reactive power of the power grid; Obtaining the total capacity value of the capacitors currently put into the power grid; Obtaining a proportional value of a primary transformer according to the first reactive power, the second reactive power and the total capacity value; configuring the primary transformer based on the proportional value of the primary transformer; The configuring the primary transformer based on the proportional value of the primary transformer comprises: Rounding the proportional value of the primary mutual inductor to obtain a proportional parameter value of the primary mutual inductor; configuring the primary mutual inductor according to the proportional parameter value of the primary mutual inductor; The rounding off of the proportional value of the primary transformer to obtain the proportional parameter value of the primary transformer includes: If the proportional value of the primary transformer is less than or equal to 10, the proportional value of the primary transformer is rounded off to obtain a proportional parameter value of the primary transformer; If the proportional value of the primary transformer is greater than 10 and less than or equal to 100, then obtain a value that is closest to the proportional value of the primary transformer and is an integer multiple of 5 to obtain the proportional parameter value of the primary transformer; If the proportional value of the primary transformer is greater than 100 and less than or equal to 1000, then obtain a value that is closest to the proportional value of the primary transformer and is an integer multiple of 50 to obtain the proportional parameter value of the primary transformer; If the proportional value of the primary transformer is greater than 1000, a value that is closest to the proportional value of the primary transformer and is an integer multiple of 500 is obtained to obtain the proportional parameter value of the primary transformer.

2. The method according to claim 1, characterized in that The obtaining a proportional value of a primary transformer according to the first reactive power, the second reactive power and the total capacity value comprises: The proportional value of the primary transformer is obtained according to the following formula: Where K is the proportional value of the primary transformer; C 实 is the total capacity value; Q1 is the first reactive power; Q2 is the second reactive power.

3. The method according to claim 1, characterized in that The step of sequentially controlling at least one capacitor to be respectively put into the power grid until the difference between the current second power factor of the power grid and the first power factor is greater than a preset difference threshold, stopping putting the at least one capacitor into use, and obtaining the current second reactive power of the power grid comprises: Controlling one of the at least one capacitor that is not put into the power grid to be put into the power grid; Acquire a current third power factor of the power grid; Determining whether a difference between the third power factor and the first power factor is greater than the preset difference threshold; If the difference between the third power factor and the first power factor is greater than the preset difference threshold, stop putting the at least one capacitor into operation and use the third power factor as the second power factor; If the difference between the third power factor and the first power factor is less than or equal to the preset difference threshold, the method returns to executing the control to put the capacitor of the at least one capacitor that is not put into the power grid into the power grid.

4. The method according to claim 1, characterized in that The obtaining of the total capacity value of the capacitor currently put into the power grid comprises: Obtaining the total rated capacity of capacitors currently put into the power grid; The total capacity value is obtained according to the total rated capacity, the effective value of the voltage of the power grid and the rated voltage value of each capacitor.

5. The method according to claim 1, characterized in that After obtaining the proportional value of the primary transformer according to the first reactive power, the second reactive power and the total capacity value, the method further includes: Cut off all capacitors connected to the power grid; Return to executing the step of obtaining the current first reactive power and the first power factor of the power grid, until there are M primary transformer ratio values ​​among the obtained N consecutive primary transformer ratio values, and the difference between the two is less than the preset ratio threshold, then obtain the average ratio value according to the average value of the ratio values ​​of the M primary transformers; N is an integer greater than 1; M is an integer greater than 1, and M is less than N; The configuring the primary transformer based on the proportional value of the primary transformer comprises: Based on the average ratio value, the primary transformer is configured.

6. A control device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 5 are implemented.

7. A reactive power compensation system, characterized in that: The reactive power compensation system comprises a control device and at least one capacitor, wherein the control device is respectively connected to the at least one capacitor; the control device is connected to a primary transformer; and the control device is used to implement the steps of the method described in any one of claims 1 to 5 above.

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

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