AVC voltage regulation method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses an AVC voltage regulation method and device, electronic equipment and a computer readable storage medium. The accuracy and the regulation speed of AVC voltage regulation can be improved. The method comprises the following steps: acquiring a first state value, a second state value and a third state value, wherein a first equivalent system voltage in the first state value, a second equivalent system voltage in the second state value and a third equivalent system voltage in the third state value are different; substituting each state value into a voltage drop formula and solving by using a linear relation to obtain system equivalent impedance; the first state value, the second state value and a fourth state value are substituted into a voltage drop formula, a linear relation and system equivalent impedance are used for solving, a reactive power regulation target value is obtained, and the fourth state value comprises a voltage regulation target value, a reactive power regulation target value and third equivalent system voltage; and performing voltage regulation according to the reactive regulation target value.

Description

Technical Field

[0001] The present application belongs to the field of power system control technology, and in particular, relates to an AVC voltage regulation method, device, electronic device and computer-readable storage medium. Background Art

[0002] In the power system, the voltage level is the standard to ensure the normal operation of the system and equipment. In order to ensure that the voltage level is within the normal range and avoid the system from not being able to work properly due to voltage instability, reactive power repair can be performed through automatic voltage control (AVC) to ensure that the bus voltage level is within the normal range.

[0003] In the AVC voltage regulation process, the system equivalent impedance is first calculated based on the voltage, reactive power and equivalent system voltage on the generator side; then the voltage regulation target value U is calculated based on the system equivalent impedance and the voltage issued by the dispatcher. set Etc., calculate the reactive power regulation target value Q set ;Finally, adjust the target value Q according to the reactive power set Perform voltage regulation process.

[0004] In calculating the system equivalent impedance and reactive power regulation target value Q set In the process of equivalent system voltage adjustment, the default equivalent system voltage is constant. That is, the system equivalent impedance and reactive power regulation target value Qset are calculated and derived under the assumption that the equivalent system voltage is constant. However, due to load fluctuations and the volatility of the grid voltage, the equivalent system voltage is also in a real-time changing state. Ignoring the real-time fluctuation of the equivalent system voltage will affect the system equivalent impedance and reactive power regulation target value Qset. set The calculation accuracy is low, which leads to low regulation accuracy and slow regulation speed of the system voltage. Summary of the invention

[0005] The embodiments of the present application provide an AVC voltage regulation method, device, electronic device, and computer-readable storage medium, which can solve the problems of low regulation accuracy and slow regulation speed of existing AVC voltage regulation.

[0006] In a first aspect, an embodiment of the present application provides an AVC voltage regulation method, including:

[0007] Obtaining a first state value, a second state value, and a third state value outputted by the generator set, wherein the first state value includes a first voltage, a first reactive power, and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power, and a second equivalent system voltage, and the third state value includes a third voltage, a third reactive power, and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage, and the third equivalent system voltage are different;

[0008] Substituting the first state value, the second state value and the third state value into the voltage drop formula respectively to obtain a first set of equations, solving the first set of equations using a linear relationship to obtain a system equivalent impedance, the linear relationship being that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage;

[0009] Obtaining a voltage regulation target value;

[0010] Substituting the first state value, the second state value and the fourth state value into the voltage drop formula respectively to obtain a second set of equations, solving the second set of equations using a linear relationship and a system equivalent impedance to obtain a reactive power regulation target value, wherein the fourth state value includes a voltage regulation target value, a reactive power regulation target value and a third equivalent system voltage;

[0011] The voltage is regulated according to the reactive power regulation target value.

[0012] As can be seen from the above, in the process of using three state values ​​to calculate the system equivalent impedance and reactive power regulation target value, the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different, and the equivalent system voltage fluctuates, that is, in the process of calculating the system equivalent impedance and reactive power regulation target value, the voltage fluctuation caused by the system load fluctuation is not ignored; further, it is considered that the equivalent system voltage fluctuates linearly, that is, the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage. The linear relationship is used to calculate the system equivalent impedance and reactive power regulation target value, eliminating the calculation error caused by voltage fluctuation. In this way, the system voltage fluctuation is not ignored in the process of calculating the system equivalent impedance and reactive power regulation target value, and the calculation error caused by voltage fluctuation is eliminated by the relationship of the linear fluctuation of the system voltage, thereby improving the calculation accuracy of the system equivalent impedance and reactive power regulation target value; using a more accurate reactive power regulation target value for voltage regulation can reduce the number of adjustments, shorten the adjustment cycle, and thus improve the adjustment speed. That is, the embodiment of the present application can quickly and accurately realize AVC voltage regulation.

[0013] In some possible implementations of the first aspect, the first state value, the second state value, and the third state value are continuous or equally spaced.

[0014] In some possible implementations of the first aspect, the first state value, the second state value, and the third state value are substituted into the voltage drop formula to obtain a first set of equations, and the first set of equations is solved using a linear relationship to obtain a system equivalent impedance, including:

[0015] Substitute the first state value, the second state value and the third state value into the voltage drop formula respectively Obtain the first set of equations Among them, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1 is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, Q is the reactive power;

[0016] Using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

[0017] In some possible implementations of the first aspect, the first state value, the second state value, and the fourth state value are substituted into the voltage drop formula to obtain a second set of equations, and the second set of equations is solved using a linear relationship and a system equivalent impedance to obtain a reactive power regulation target value, including:

[0018] Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively Obtain the second set of equations Among them, U set is the voltage regulation target value, Q set It is the target value for reactive power regulation;

[0019] Using the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solve the second set of equations to obtain the reactive power regulation target value.

[0020] In a second aspect, an embodiment of the present application provides an AVC voltage regulating device, comprising:

[0021] A state value acquisition module is used to acquire a first state value, a second state value and a third state value output by the generator set, wherein the first state value includes a first voltage, a first reactive power and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power and a second equivalent system voltage, and the third state value includes a third voltage, a third reactive power and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different;

[0022] An equivalent impedance calculation module, used for respectively substituting the first state value, the second state value and the third state value into the voltage drop formula to obtain a first set of equations, solving the first set of equations using a linear relationship to obtain a system equivalent impedance, wherein the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage;

[0023] A voltage setting value acquisition module is used to obtain a voltage regulation target value;

[0024] A reactive power regulation target value calculation module is used to substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively to obtain a second set of equations, and solve the second set of equations using a linear relationship and a system equivalent impedance to obtain a reactive power regulation target value, wherein the fourth state value includes a voltage regulation target value, a reactive power regulation target value and a third equivalent system voltage;

[0025] The regulation module is used to regulate the voltage according to the reactive power regulation target value.

[0026] In some possible implementations of the second aspect, the first state value, the second state value, and the third state value are continuous or equally spaced.

[0027] In some possible implementations of the second aspect, the equivalent impedance calculation module is specifically used to:

[0028] Substitute the first state value, the second state value and the third state value into the voltage drop formula respectively Obtain the first set of equations Among them, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1 is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, Q is the reactive power;

[0029] Using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

[0030] In some possible implementations of the second aspect, the reactive power regulation target value calculation module is specifically used to:

[0031] Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively Obtain the second set of equations Among them, Uset is the voltage regulation target value, Q set It is the target value for reactive power regulation;

[0032] Using the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solve the second set of equations to obtain the reactive power regulation target value.

[0033] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any method of the first aspect when executing the computer program.

[0034] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of any one of the above-mentioned first aspects is implemented.

[0035] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on an electronic device, the electronic device executes any one of the methods described in the first aspect.

[0036] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of a stand-alone-infinity system provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of voltage fluctuations on both sides of the bus provided in an embodiment of the present application;

[0040] Figure 3 A schematic block diagram of a process of the AVC voltage regulation method provided in an embodiment of the present application;

[0041] Figure 4 A schematic block diagram of the structure of the AVC voltage regulation device provided in an embodiment of the present application;

[0042] Figure 5 A schematic block diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0044] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0045] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0046] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0047] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0048] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0049] In order to better introduce the technical solution provided by the embodiment of the present application, the following takes a single-machine-infinite system as the analysis object to introduce the calculation and derivation process of the voltage drop formula. Among them, the single-machine-infinite system is used as the analysis object to ignore the complexity of the power system, making the analysis relatively simple.

[0050] See also Figure 1 The schematic diagram of the single-machine-infinity system provided by the embodiment of the present application is shown, and the single-machine-infinity system includes a generator set G and an electrical equipment side. Figure 1 In the figure, the voltages on both sides of the busbar are represented by U and U s Indicates that S is the apparent power, R is the resistance, X is the system equivalent impedance, P is the active power on the generator side, and Q is the reactive power on the generator side. s , Q s They are respectively the active power and reactive power after passing through the substation.

[0051] The voltage fluctuations of the loads and access points on both sides of the busbar in the system can be expressed as follows: Figure 2 As shown. Among them, δ represents the power angle deviation of the voltage on both sides, δU represents the amplitude difference caused by voltage fluctuation, and ΔU represents the voltage difference compensation amount on both sides of the bus.

[0052] Combination Figure 1 and Figure 2 , the voltage difference on both sides of the bus can be obtained, as shown in the following formula 1:

[0053]

[0054] in, is the current and j is the imaginary unit.

[0055] use Figure 1 P+jQ and P in s +jQ s Substituting into the formula, the current in Equation 1 is By replacing, the voltage difference formulas on both sides of the busbar can be obtained as follows: Formula 2 and Formula 3.

[0056]

[0057] Among them, since the power angle δ is generally small, the amplitude difference caused by δU can be ignored, and the voltage drop formula is shown in the following formula 4 and formula 5:

[0058] U=U s +ΔU (4)

[0059]

[0060] Wherein, by substituting ΔU in Formula 2 into Formula 4, Formula 5 can be obtained.

[0061] The above formula 5 can be used as the main algorithm of AVC regulation to calculate the system equivalent impedance X and the reactive regulation target value Q of AVC voltage regulation. set For high voltage lines of 110 kV and above, the system equivalent impedance X is usually more than five times of R, so R in the above formula 5 can be ignored. Based on this, formula 5 can be transformed into the following formula 6.

[0062]

[0063] The above formula 6 is the voltage drop formula during the AVC regulation process. Through this voltage drop formula, the system equivalent impedance X and reactive power regulation target value Q can be calculated. set .

[0064] Combined with formula 6, the system equivalent impedance X and reactive power regulation target value Q in the related art are: set The calculation derivation process is introduced and explained.

[0065] In the calculation process of the system equivalent impedance X in the related art, it is assumed that the system voltage is constant, that is, it is assumed that U s At this time, the reactive voltage state of the generator set output changes from (U0, Q0) to (U1, Q1). Substituting the two state values ​​(U0, Q0) and (U1, Q1) into the above formula 6 (i.e., the voltage drop formula), the following formula 7 can be obtained.

[0066]

[0067] Subtracting the upper and lower equations in equation 7, we can obtain the following equation 8.

[0068]

[0069] It should be pointed out that due to the default U s is constant, that is, ignoring the system voltage fluctuation, so after subtracting the upper and lower equations in equation 7, U s Eliminate.

[0070] By transforming the above formula 8, we can get the expression of the system equivalent impedance X, which is shown in the following formula 9.

[0071]

[0072] As can be seen from the above, based on the voltage drop formula and the two state values ​​of the generator set output, the system equivalent impedance X can be calculated. In this calculation process, the default U s is constant, that is, the system voltage fluctuation is ignored.

[0073] When the generator side G outputs reactive voltage state (U0, Q0), the voltage command issued by the dispatcher is adjusted to U set At this time, (U0,Q0) and (U set , Q set ) these two state values ​​are substituted into the voltage drop formula (i.e., the above formula 6), then the following formula 10 can be obtained.

[0074]

[0075] Subtracting the upper and lower equations in equation 10, we can get the reactive power regulation target value Q set The specific expression of is as follows:

[0076]

[0077] It should be pointed out that due to the default U s is constant, that is, ignoring the system voltage fluctuation, so after subtracting the upper and lower equations in equation 10, U s Eliminate.

[0078] As can be seen from the above, according to the voltage drop formula, the system equivalent impedance X, the state value of the generator set output and the voltage command value U issued by the dispatcher set , the reactive power regulation target value Q can be calculated set In this calculation process, the default U s is constant, that is, the system voltage fluctuation is ignored.

[0079] In the related art, when calculating the system equivalent impedance X and the reactive power regulation target value Q set During the process, the system voltage fluctuation is ignored and the default equivalent system voltage U s is constant. However, in actual process, the equivalent system voltage U s It fluctuates in real time, ignoring the fact that system voltage fluctuations will affect the system equivalent impedance X and reactive power regulation target value Q set The calculation accuracy of the system equivalent impedance X and reactive power regulation target value Q set The calculation accuracy of is low, which will affect the accuracy of the system AVC voltage regulation. That is, the accuracy of the AVC voltage regulation is low.

[0080] In addition, the accuracy of AVC voltage regulation is low, and it must rely on multiple adjustments to meet the regulation requirements, that is, the number of adjustments is large. A large number of adjustments will increase the regulation cycle, which in turn affects the speed of regulation of the entire system. That is, the regulation speed of AVC voltage regulation is slow. For example, the regulation cycle of the AVC substation of a new energy electric field is long. When the grid-connected bus voltage fluctuates rapidly and frequently due to external reasons, the AVC system cannot adjust the fluctuations in a timely, accurate and rapid manner, making the regulation speed of the AVC substation slow.

[0081] In response to the above-mentioned problems of low accuracy and slow regulation speed of AVC voltage regulation, the embodiment of the present application provides an AVC voltage regulation scheme, so that in the process of calculating the system equivalent impedance and reactive power regulation target value, the fluctuation of the system voltage is not ignored, and the characteristic of the system voltage being a linear fluctuation is used to eliminate the calculation error caused by the system voltage fluctuation, thereby making the calculation of the system equivalent impedance and reactive power regulation target value more accurate. When adjusting according to a more accurate reactive power regulation target value, the accuracy of AVC voltage regulation can be higher; the higher the accuracy of AVC voltage regulation, the fewer the number of adjustments can be, that is, the regulation requirements can be met with fewer adjustments, thereby shortening the regulation cycle and improving the speed of system regulation.

[0082] See also Figure 3 , is a schematic flow chart of an AVC voltage regulation method provided in an embodiment of the present application, and the method may include the following steps:

[0083] Step S301, obtaining a first state value, a second state value and a third state value output by the generator set, wherein the first state value includes a first voltage, a first reactive power and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power and a second equivalent system voltage, and the third state value includes a third voltage, a third reactive power and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different.

[0084] It should be pointed out that the embodiment of the present application does not ignore the system voltage fluctuation caused by the system load fluctuation, and considering that the load fluctuation is basically at the minute level, while the AVC regulation is at the second level, it can be assumed that the fluctuation of the system voltage in a short time (seconds) presents a linear fluctuation. Based on this, the AVC voltage regulation scheme taking into account the system voltage fluctuation provided in the embodiment of the present application adopts a three-point sampling data calculation method to eliminate the influence of the equivalent system voltage Us fluctuation. That is, the system equivalent impedance and reactive power regulation target value are calculated through three-point sampling data (i.e., three state values).

[0085] In some embodiments, the first state value, the second state value, and the third state value are continuous or equally spaced. Generally, the smaller the interval between the two state values, the smaller the error. The first equivalent system voltage, the second equivalent system voltage, and the third equivalent system voltage are different, that is, the equivalent voltages in the three state values ​​are different. In other words, the system voltage fluctuation is not ignored during the calculation process, and the equivalent system voltage is not constant.

[0086] Step S302: Substitute the first state value, the second state value, and the third state value into the voltage drop formula respectively to obtain a first set of equations, and solve the first set of equations using a linear relationship to obtain a system equivalent impedance, wherein the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage.

[0087] From the above, it can be seen that the fluctuation of system voltage in a short time (seconds) presents as linear fluctuation. Based on the characteristics of linear fluctuation of equivalent system voltage, the influence of equivalent system voltage fluctuation is eliminated, thereby improving the accuracy of system equivalent impedance and reactive power regulation target value.

[0088] Based on the linear fluctuation characteristics of the equivalent system voltage, a linear relationship between the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage can be obtained, that is, the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage.

[0089] For example, the generator set outputs three consecutive state values ​​(U0, Q0, U s0 )、(U1,Q1,U s1 )、(U2,Q2,U s2 ).

[0090] Among them, the first state value is (U0,Q0,U s0 ), the second state value is (U1,Q1,U s1 ), the third state value is (U2,Q2,U s2 ). s0 is the first equivalent system voltage, U s1 is the second equivalent system voltage, which is U s2 The third equivalent system voltage is: At this time, the linear relationship can be shown as in equation 12 below.

[0091] U s0 +U s2 -2U s1 =ξ≈0 (12)

[0092] In some embodiments, the first state value, the second state value, and the third state value can be respectively substituted into the voltage drop formula The first set of equations as shown in Equation 13 is obtained.

[0093]

[0094] Among them, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, and Q is the reactive power.

[0095] Then, using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

[0096] Specifically, using the linear relationship U s0 +U s2 =2U s1 , by rearranging the above formula 13, we can obtain the following formula 14. That is, by adding the upper formula and the lower formula in the above formula 13, and then subtracting twice the middle formula, we can obtain the following formula

[0097] Formula 14.

[0098]

[0099] By rearranging the above formula 14, we can obtain the calculation formula of the system equivalent impedance X, which is as follows:

[0100] As shown in formula 15.

[0101]

[0102] As can be seen from the above, in the process of calculating the system equivalent impedance X, the equivalent system voltages of the three state values ​​are different, that is, the system voltage fluctuation is not ignored. In addition, when considering the system voltage fluctuation, based on the characteristics of linear fluctuation of the system voltage in a short period of time, the linear relationship is used to eliminate the calculation error caused by the system voltage fluctuation, thereby making the calculated equivalent system impedance X more accurate.

[0103] Step S303: Obtain a voltage regulation target value.

[0104] Among them, the voltage regulation target value is the U set .

[0105] Step S304: Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively to obtain a second set of equations, solve the second set of equations using a linear relationship and a system equivalent impedance to obtain a reactive power regulation target value, and the fourth state value includes a voltage regulation target value, a reactive power regulation target value and a third equivalent system voltage.

[0106] In some embodiments, assuming that the generator set output (U 0, Q 0, Us0 ) and (U1,Q1,U s1 ) two consecutive state values, and at the same time receive the voltage command to adjust to U set (i.e. voltage regulation target value). At this time, (U 0, Q 0, U s0 )、(U1,Q1,U s1 ) and (U set ,Q set ,U s2 ) are substituted into the above voltage drop formula. That is, the first state value, the second state value and the fourth state value are substituted into the voltage drop formula respectively. Among them, (U set ,Q set ,U s2 ) is the fourth state value. The second set of equations is obtained, as shown in the following equation 16.

[0107]

[0108] Among them, U set is the voltage regulation target value, Q set It is the reactive power regulation target value.

[0109] Reusing the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solve the second set of equations to obtain the reactive power regulation target value.

[0110] Specifically, by rearranging and calculating the above formula 16, the following formula 17 can be obtained.

[0111]

[0112] Further rearrangement of the above formula 17 can obtain the reactive power regulation target value Q set The calculation formula is as shown in Formula 18.

[0113]

[0114] In the above formula 18, the system equivalent impedance X is known. Using a more accurate system equivalent impedance X to calculate the reactive power regulation target value can improve the calculation accuracy of the reactive power regulation target value. set In the process of calculating the equivalent system voltage of the three state values, the equivalent system voltage of the three state values ​​is different, that is, the system voltage fluctuation is not ignored. In addition, considering the system voltage fluctuation, based on the characteristic of linear fluctuation of the system voltage in a short period of time, the linear relationship is used to eliminate the calculation error caused by the system voltage fluctuation, so that the calculated reactive power regulation target value Q setThe accuracy is higher.

[0115] That is to say, when calculating the system equivalent impedance and reactive power regulation target value, the embodiment of the present application does not ignore the system voltage fluctuation, and utilizes the characteristic of linear fluctuation of the system voltage in a short period of time, and adopts three-point sampling voltage data to eliminate the error caused by the system voltage fluctuation, which is more accurate.

[0116] Step S305: regulating voltage according to the reactive power regulation target value.

[0117] In specific applications, in the process of adjusting according to the reactive power regulation target value, the dead zone threshold can be set to determine whether to start the adjustment. The AVC voltage regulation system is generally a second-level regulation device with a cycle set to about 15 to 30 seconds. After the regulation system is turned on, the regulation command of the reactive device is calculated and sent to the reactive device to realize closed-loop regulation control. During the regulation process, the system bus voltage changes with the dispatch voltage command value, and maintains the system bus voltage within the dead zone of the voltage command value.

[0118] As can be seen from the above, in the process of using three state values ​​to calculate the system equivalent impedance and reactive power regulation target value in the embodiment of the present application, the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different, and the equivalent system voltage fluctuates, that is, in the process of calculating the system equivalent impedance and reactive power regulation target value, the voltage fluctuation caused by the system load fluctuation is not ignored; further, it is considered that the equivalent system voltage fluctuates linearly, that is, the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage. Using this linear relationship to calculate the system equivalent impedance and reactive power regulation target value eliminates the calculation error caused by voltage fluctuation.

[0119] In this way, the system voltage fluctuation is not ignored in the process of calculating the system equivalent impedance and reactive power regulation target value, and the calculation error caused by the voltage fluctuation is eliminated through the relationship of the system voltage linear fluctuation according to the three-point voltage data, thereby improving the calculation accuracy of the system equivalent impedance and reactive power regulation target value; using a more accurate reactive power regulation target value for voltage regulation can reduce the number of adjustments, shorten the adjustment cycle, and thereby improve the adjustment speed. That is, the embodiment of the present application can quickly and accurately implement AVC voltage regulation, ensuring the accuracy and timeliness of AVC voltage regulation.

[0120] The AVC regulation method provided in the embodiment of the present application can be applied to an AVC substation. For example, an AVC substation of a new energy power plant. The voltage regulation target value U set It is dispatched by the AVC master station.

[0121] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0122] Corresponding to the AVC voltage regulation method described in the above embodiment, Figure 4 A schematic block diagram of the structure of an AVC voltage regulating device provided in an embodiment of the present application is shown. For the sake of convenience of explanation, only the parts related to the embodiment of the present application are shown.

[0123] Reference Figure 4 , the device comprises:

[0124] The state value acquisition module 41 is used to acquire a first state value, a second state value and a third state value output by the generator set, wherein the first state value includes a first voltage, a first reactive power and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power and a second equivalent system voltage, and the third state value includes a third voltage, a third reactive power and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different;

[0125] An equivalent impedance calculation module 42 is used to substitute the first state value, the second state value and the third state value into the voltage drop formula respectively to obtain a first set of equations, and solve the first set of equations using a linear relationship to obtain a system equivalent impedance, wherein the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage;

[0126] A voltage setting value acquisition module 43 is used to acquire a voltage regulation target value;

[0127] a reactive power regulation target value calculation module 44, for respectively substituting the first state value, the second state value and the fourth state value into the voltage drop formula to obtain a second set of equations, and solving the second set of equations using a linear relationship and a system equivalent impedance to obtain a reactive power regulation target value, wherein the fourth state value includes a voltage regulation target value, a reactive power regulation target value and a third equivalent system voltage;

[0128] The regulating module 45 is used to regulate the voltage according to the reactive power regulation target value.

[0129] In some possible implementations, the first state value, the second state value, and the third state value are continuous or equally spaced.

[0130] In some possible implementations, the equivalent impedance calculation module is specifically used to:

[0131] Substitute the first state value, the second state value and the third state value into the voltage drop formula respectively Obtain the first set of equations Among them, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1 is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, Q is the reactive power;

[0132] Using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

[0133] In some possible implementations, the reactive power regulation target value calculation module is specifically used to:

[0134] Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively Obtain the second set of equations Among them, U set is the voltage regulation target value, Q set It is the target value for reactive power regulation;

[0135] Using the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solve the second set of equations to obtain the reactive power regulation target value.

[0136] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / modules are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0137] Figure 5 This is a schematic block diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 5 As shown, the electronic device 5 of this embodiment includes: at least one processor 50 ( Figure 5 Only one is shown in the figure), a memory 51, and a computer program 52 stored in the memory 51 and executable on the at least one processor 50, wherein the processor 50 implements the steps of any of the above-mentioned method embodiments when executing the computer program 52.

[0138] The electronic device may include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will appreciate that Figure 5It is only an example of the electronic device 5 and does not constitute a limitation on the electronic device 5. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0139] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0140] In some embodiments, the memory 51 may be an internal storage unit of the electronic device 5, such as a hard disk or memory of the electronic device 5. In other embodiments, the memory 51 may also be an external storage device of the electronic device 5, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the electronic device 5. The memory 51 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 51 may also be used to temporarily store data that has been output or is to be output.

[0141] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0142] In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other and are not used to limit the protection scope of this application. The specific working process of the units and modules in the above system can refer to the corresponding process in the above method embodiment, which will not be repeated here.

[0143] An embodiment of the present application also provides an electronic device, which includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor implements the steps of any of the above-mentioned method embodiments when executing the computer program.

[0144] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0145] An embodiment of the present application provides a computer program product. When the computer program product runs on an electronic device, the electronic device can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0146] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0147] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0148] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0149] In the embodiments provided in the present application, it should be understood that the disclosed devices, electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0150] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0151] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An AVC voltage regulation method, characterized in that: include: Acquire a first state value, a second state value, and a third state value output by a generator set, wherein the first state value includes a first voltage, a first reactive power, and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power, and a second equivalent system voltage, the third state value includes a third voltage, a third reactive power, and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage, and the third equivalent system voltage are different; Substituting the first state value, the second state value and the third state value into the voltage drop formula respectively to obtain a first set of equations, solving the first set of equations using a linear relationship to obtain a system equivalent impedance, wherein the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage; Obtaining a voltage regulation target value; Substituting the first state value, the second state value and the fourth state value into the voltage drop formula respectively to obtain a second set of equations, solving the second set of equations using the linear relationship and the system equivalent impedance to obtain a reactive power regulation target value, wherein the fourth state value includes the voltage regulation target value, the reactive power regulation target value and the third equivalent system voltage; Voltage regulation is performed according to the reactive power regulation target value.

2. The method according to claim 1, characterized in that The first state value, the second state value and the third state value are continuous or equally spaced.

3. The method according to claim 1, characterized in that Substituting the first state value, the second state value and the third state value into the voltage drop formula respectively to obtain a first set of equations, and solving the first set of equations using a linear relationship to obtain a system equivalent impedance, including: Substitute the first state value, the second state value and the third state value into the voltage drop formula respectively Obtain the first set of equations Wherein, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1 is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, Q is the reactive power; Using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

4. The method according to any one of claims 1 to 3, characterized in that Substituting the first state value, the second state value, and the fourth state value into the voltage drop formula respectively to obtain a second set of equations, and solving the second set of equations using the linear relationship and the system equivalent impedance to obtain a reactive power regulation target value, including: Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively. Obtain the second set of equations Among them, U set is the voltage regulation target value, Q set is the reactive power regulation target value; Using the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solving the second set of equations to obtain the reactive power regulation target value.

5. An AVC voltage regulating device, characterized in that: include: A state value acquisition module, used to acquire a first state value, a second state value and a third state value output by a generator set, wherein the first state value includes a first voltage, a first reactive power and a first equivalent system voltage, the second state value includes a second voltage, a second reactive power and a second equivalent system voltage, the third state value includes a third voltage, a third reactive power and a third equivalent system voltage, and the first equivalent system voltage, the second equivalent system voltage and the third equivalent system voltage are different; an equivalent impedance calculation module, used for respectively substituting the first state value, the second state value and the third state value into a voltage drop formula to obtain a first set of equations, and solving the first set of equations using a linear relationship to obtain a system equivalent impedance, wherein the linear relationship is that the sum of the first equivalent system voltage and the third equivalent system voltage is equal to twice the second equivalent system voltage; A voltage setting value acquisition module is used to obtain a voltage regulation target value; a reactive power regulation target value calculation module, used for respectively substituting the first state value, the second state value and the fourth state value into the voltage drop formula to obtain a second set of equations, solving the second set of equations using the linear relationship and the system equivalent impedance to obtain a reactive power regulation target value, wherein the fourth state value includes the voltage regulation target value, the reactive power regulation target value and the third equivalent system voltage; The regulating module is used to regulate the voltage according to the reactive power regulation target value.

6. The device according to claim 5, characterized in that The first state value, the second state value and the third state value are continuous or equally spaced.

7. The device according to claim 5, characterized in that The equivalent impedance calculation module is specifically used for: Substitute the first state value, the second state value and the third state value into the voltage drop formula respectively Obtain the first set of equations Wherein, U0 is the first voltage, Q0 is the first reactive power, U s0 is the first equivalent system voltage; U1 is the second voltage, Q1 is the second reactive power, U s1 is the second equivalent system voltage; U2 is the third voltage, Q2 is the third reactive power, U s2 is the third equivalent system voltage; X is the system equivalent impedance; U is the generator side voltage, U s is the equivalent system voltage, Q is the reactive power; Using the linear relationship U s0 +U s2 =2U s1 , solve the first set of equations to obtain the system equivalent impedance.

8. The device according to any one of claims 5 to 7, characterized in that The reactive power regulation target value calculation module is specifically used for: Substitute the first state value, the second state value and the fourth state value into the voltage drop formula respectively. Obtain the second set of equations Among them, U set is the voltage regulation target value, Q set is the reactive power regulation target value; Using the linear relationship U s0 +U s2 =2U s1 and the system equivalent impedance, solving the second set of equations to obtain the reactive power regulation target value.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

Images