A voltage-controlled reactive power distribution method, device, equipment and storage medium

Abstract

The present invention discloses a voltage-controlled reactive power distribution method, device, equipment and computer-readable storage medium, the method comprising: obtaining the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator; performing preliminary adjustment on the terminal voltage of each joint generator according to the required reactive power value to obtain the preliminary adjustment voltage of each joint generator; calculating the circulating current value between each joint generator according to the preliminary adjustment voltage; adjusting the terminal voltage of the joint generator according to the circulating current value; the present invention calculates the circulating current value between each joint generator according to the preliminary adjustment voltage, thereby obtaining the circulating current value according to the original reactive power distribution between the joint generators running in parallel in the power plant, thereby adjusting the terminal voltage of the joint generator according to the calculated circulating current value, providing a more reasonable reactive power distribution for the joint generator, achieving the goal of reducing the reactive circulating current between the joint generators, and reducing power loss.

Description

Technical Field

[0001] The present invention relates to the field of voltage and reactive power control of power systems, and in particular to a voltage-controlled reactive power distribution method, device, equipment, and computer-readable storage medium. Background Art

[0002] Currently, the Automatic Voltage Control (AVC) system plays a role in stabilizing the voltage-boosting and high-voltage side bus voltage in a multi-generator combined cycle power plant (such as a gas-steam combined cycle power plant).

[0003] However, due to the inconsistencies in the capacities, electrical parameters, and transformer parameters of the multiple generators operating in parallel in a multi-generator combined cycle power plant, improper reactive power distribution among the multiple generators can lead to reactive current circulating between them, resulting in additional power losses. For example, improper reactive power distribution between the gas turbine generator and the steam generator in a gas-steam combined cycle power plant can cause reactive current circulating between the two generators, resulting in additional power losses. Therefore, providing a more reasonable reactive power distribution solution for each generator in a power plant, suppressing the circulating current problem between generators and reducing power losses, is an urgent issue to be addressed. Summary of the Invention

[0004] The purpose of the present invention is to provide a voltage-controlled reactive power distribution method, device, equipment and computer-readable storage medium to provide a more reasonable reactive power distribution scheme for each generator in a power plant, suppress the circulating current problem between generators, and reduce power loss.

[0005] To solve the above technical problems, the present invention provides a voltage-controlled reactive power distribution method, comprising:

[0006] Obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator;

[0007] performing preliminary adjustment on the terminal voltage of each of the combined generators according to the required reactive power value to obtain the preliminary adjusted voltage of each of the combined generators;

[0008] Calculating circulating current values ​​between the combined generators according to the initial adjustment voltage;

[0009] The terminal voltage of the combined generator is adjusted according to the circulating current value.

[0010] Optionally, obtaining the required reactive power value of each generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator includes:

[0011] Calculating a total distributed reactive value corresponding to the high-voltage side bus voltage according to the high-voltage side bus voltage and the voltage control instruction;

[0012] The required reactive value is calculated according to the total distributed reactive value and the short-circuit capacity of each of the combined generators.

[0013] Optionally, when the combined generator includes a first generator and a second generator, calculating the required reactive value according to the total distributed reactive value and the short-circuit capacity of each combined generator includes:

[0014] According to the short-circuit reactance of each combined generator, Calculate the short-circuit capacity of each of the combined generators; where S g is the short-circuit capacity of any of the combined generators, X g is the short-circuit reactance of any of the combined generators, S N is the baseline capacity;

[0015] According to the short-circuit capacity of each of the combined generators and the total distributed reactive power value, Calculate the required reactive value; wherein ΔQ1 is the required reactive value of the first generator, ΔQ2 is the required reactive value of the first generator, ΔQ is the total distributed reactive value, S g1 is the short-circuit capacity of the first generator, S g2 is the short-circuit capacity of the second generator.

[0016] Optionally, when the combined generator includes a first generator and a second generator, calculating the circulating current value between the combined generators according to the initial adjustment voltage includes:

[0017] pass Calculate the circulating current value; wherein ΔI is the circulating current value, U1 is the initial adjustment voltage of the first generator, U2 is the initial adjustment voltage of the second generator, X 2′ is the equivalent reactance of a split winding on the low-voltage side of the transformer, X 2″ is the equivalent reactance of the two split windings on the low-voltage side of the transformer, the first generator is connected to one split winding on the low-voltage side of the transformer, and the second generator is connected to the two split windings on the low-voltage side of the transformer.

[0018] Optionally, adjusting the terminal voltage of the combined generator according to the circulating current value includes:

[0019] Determining whether the circulation value is greater than a first threshold;

[0020] If so, the terminal voltage of the combined generator is adjusted.

[0021] Optionally, when the combined generator includes a first generator and a second generator, adjusting the terminal voltage of the combined generator includes:

[0022] determining an adjusted terminal voltage of the first generator and the second generator according to a preset adjusted voltage and the current terminal voltage of the first generator and the second generator;

[0023] determining whether an absolute value of a difference between the regulated terminal voltages of the first generator and the second generator is less than a second threshold;

[0024] If so, adjusting the terminal voltage of the combined generator according to the adjusted terminal voltages of the first generator and the second generator;

[0025] If not, determine whether the number of adjustments reaches the number threshold;

[0026] If the number threshold is reached, performing the step of adjusting the terminal voltage of the combined generator according to the adjusted terminal voltages of the first generator and the second generator;

[0027] If the number threshold is not reached, the number of adjustments is increased by 1, and the adjusted terminal voltage of the first generator and the second generator is determined as the current terminal voltage of the first generator and the second generator, and the step of determining the adjusted terminal voltage of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltage of the first generator and the second generator is performed.

[0028] Optionally, determining the adjusted terminal voltages of the first generator and the second generator according to the preset adjusted voltage and the current terminal voltages of the first generator and the second generator includes:

[0029] If the first current generator-end voltage is greater than the second current generator-end voltage, the difference between the first current generator-end voltage and the preset adjusted voltage is determined as the first adjusted generator-end voltage, and the sum of the second current generator-end voltage and the preset adjusted voltage is determined as the second adjusted generator-end voltage; wherein the first current generator-end voltage and the first adjusted generator-end voltage are respectively the current generator-end voltage and the adjusted generator-end voltage of the first generator, and the second current generator-end voltage and the second adjusted generator-end voltage are respectively the current generator-end voltage and the adjusted generator-end voltage of the second generator;

[0030] If the first current machine-end voltage is not greater than the second current machine-end voltage, the sum of the first current machine-end voltage and the preset adjustment voltage is determined as the first adjusted machine-end voltage, and the difference between the second current machine-end voltage and the preset adjustment voltage is determined as the second adjusted machine-end voltage.

[0031] The present invention also provides a voltage-controlled reactive power distribution device, comprising:

[0032] The reactive power calculation module is used to obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator;

[0033] A voltage initial adjustment module, configured to perform initial adjustment on the terminal voltage of each of the combined generators according to the required reactive power value, and obtain an initial adjustment voltage of each of the combined generators;

[0034] a circulating current calculation module, configured to calculate the circulating current value between each of the joint generators according to the initial adjustment voltage;

[0035] The voltage adjustment module is used to adjust the terminal voltage of the combined generator according to the circulating current value.

[0036] The present invention also provides a voltage-controlled reactive power distribution device, comprising:

[0037] Memory for storing computer programs;

[0038] A processor is configured to implement the steps of the voltage-controlled reactive power distribution method as described above when executing the computer program.

[0039] In addition, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the voltage-controlled reactive power distribution method as described above are implemented.

[0040] The present invention provides a voltage-controlled reactive power distribution method, comprising: obtaining a required reactive power value of each joint generator based on the high-voltage side bus voltage and the voltage control instruction of the joint generator; performing preliminary adjustment on the terminal voltage of each joint generator based on the required reactive power value to obtain the preliminary adjustment voltage of each joint generator; calculating the circulating current value between each joint generator based on the preliminary adjustment voltage; and adjusting the terminal voltage of the joint generator based on the circulating current value;

[0041] As can be seen, the present invention calculates the circulating current value between each joint generator based on the initial voltage adjustment. This can calculate the circulating current value between the joint generators operating in parallel in a power plant according to the original reactive power distribution. Based on the calculated circulating current value, the terminal voltage of the joint generator is adjusted, providing a more reasonable reactive power distribution for the joint generators, achieving the goal of reducing the reactive circulating current between the joint generators in the power plant and reducing power loss. Furthermore, the present invention also provides a voltage-controlled reactive power distribution device, equipment, and computer-readable storage medium, which also have the aforementioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0043] Figure 1 A flowchart of a voltage-controlled reactive power distribution method provided by an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of another voltage-controlled reactive power distribution method provided by an embodiment of the present invention;

[0045] Figure 3 An equivalent circuit diagram of a main transformer of another voltage-controlled reactive power distribution method provided by an embodiment of the present invention;

[0046] Figure 4 This is a structural block diagram of a voltage-controlled reactive power distribution device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0048] Please refer to Figure 1 , Figure 1 This is a flow chart of a voltage-controlled reactive power distribution method provided by an embodiment of the present invention. The method may include:

[0049] Step 101: Obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator.

[0050] The combined generator in this step can be multiple generators running in parallel in a power plant, such as Figure 2 The gas turbine generator and steam generator in the gas-steam combined cycle power plant, i.e., the two generators, can be connected to the same busbar through a transformer with split windings on the low-voltage side. The high-voltage side busbar voltage in this step can be the voltage on the high-voltage side of the busbar to which the combined generator is connected, such as Figure 2The AVC (Automatic Voltage Control System) collects the high-voltage side bus voltage through the PT (voltage transformer). The voltage control instruction of the combined generator in this step can be an instruction for controlling the terminal voltage of the combined generator, such as Figure 2 The AVC receives the dispatching AVC instructions (such as the control instructions for the target high-voltage side bus voltage or the control instructions for the target terminal voltage of each joint generator), that is, the AVC can control the AVR (automatic voltage regulation system) of each joint generator according to the dispatching AVC instructions to control the terminal voltage of each joint generator.

[0051] Specifically, the required reactive value of each joint generator in this step can be the reactive amount of each joint generator required to maintain the voltage of the voltage control instruction; that is, in this step, the processor can calculate and obtain the required reactive value of each joint generator based on the high-voltage side bus voltage and the voltage control instruction of the joint generator. The specific method for the processor in this step to obtain the required reactive value of each joint generator based on the high-voltage side bus voltage and the voltage control instruction of the joint generator can be set by the designer according to the practical scenario and user needs. For example, the AVC processor can calculate the reactive amount (i.e., the total distributed reactive value) required to maintain the target high-voltage side bus voltage based on the collected high-voltage side bus voltage and the control instruction of the target high-voltage side bus voltage (i.e., the voltage control instruction); and calculate the required reactive value of each joint generator using the total distributed reactive value and the short-circuit capacity of each joint generator.

[0052] For example, a combined generator includes a first generator (e.g. Figure 2 Steam generator in) and second generator (such as Figure 2 When the two generators (gas turbine generator in the generator) are connected, AVC can use the same or similar method as the reactive power calculation method in the prior art to compare the current high-voltage side bus voltage collected with the target high-voltage side bus voltage corresponding to the voltage control instruction, and calculate the reactive power required to maintain the target high-voltage side bus voltage (i.e., the total distributed reactive power value); according to the short-circuit reactance of each combined generator, Calculate the short-circuit capacity of each joint generator; according to the short-circuit capacity of each joint generator and the total distributed reactive power value, Calculate the required reactive power; where S g is the short-circuit capacity of any combined generator, X g is the short-circuit reactance of any combined generator, S N is the reference capacity; ΔQ1 is the required reactive power value of the first generator, ΔQ2 is the required reactive power value of the first generator, ΔQ is the total distributed reactive power value, S g1 is the short-circuit capacity of the first generator, S g2 is the short-circuit capacity of the second generator.

[0053] Accordingly, the method provided in this embodiment may further include a process of calculating the short-circuit capacity of each joint generator. For example, the processor may calculate the short-circuit capacity of each joint generator by Calculate the short-circuit reactance of each combined generator; where X g is the equivalent reactance of any combined generator, X t is the transformer reactance from the short-circuit point of any joint generator to the generator end, X d ' is the subtransient time constant of any combined generator, and Xs is the equivalent reactance of the high-voltage side system. Figure 3 As shown, the relationship between the transformer reactance Xt and the split winding reactance can be X t =X1+X 2′ ;in, X 1-2 It can be the through reactance between the high voltage winding and the total low voltage winding, X 2′-2″ is the split reactance between the split windings.

[0054] It should be noted that the parameters of the generator and transformer are generally expressed as per-unit values ​​at their respective nominal capacities. In this embodiment, when performing algebraic calculations on them, they can be converted to a unified reference capacity.

[0055] Step 102: Preliminary adjustment is performed on the terminal voltage of each joint generator according to the required reactive power value to obtain the preliminary adjusted voltage of each joint generator.

[0056] It can be understood that in this step, the processor can perform an initial adjustment on the terminal voltage of each joint generator based on the required reactive power value of each joint generator obtained, and obtain the steady-state terminal voltage (i.e., the initial adjustment voltage) of each joint generator after the initial adjustment; that is, the initial adjustment voltage in this step can be the steady-state terminal voltage of each joint generator after the initial adjustment, i.e., the steady-state value of the terminal voltage of each joint generator after the initial adjustment.

[0057] like Figure 2 As shown in FIG, when the combined generator includes a first generator and a second generator, the AVC can send the acquired required reactive power value ΔQ1 of the first generator and the acquired required reactive power value ΔQ2 of the second generator to their respective AVRs to achieve reactive power regulation of the two generators. That is, the AVR uses the excitation voltage at the collector end as input and adjusts the excitation voltage through the internal voltage closed-loop controller.

[0058] Step 103: Calculate the circulating current value between each joint generator according to the initial adjustment voltage.

[0059] It can be understood that in this step, the processor can calculate the reactive circulating current (i.e., circulating current value) between each joint generator based on the steady-state terminal voltage (i.e., initial adjustment voltage) reached by each joint generator after initial adjustment, thereby realizing circulating current calculation verification.

[0060] Specifically, the specific method for the processor to calculate the circulating current value between each joint generator according to the initial voltage in this step can be set by the designer according to the practical scenario and user needs. For example, when the joint generator includes a first generator and a second generator, the processor can calculate the circulating current value between each joint generator according to the initial voltage. Calculate the circulating current value; where ΔI is the circulating current value, U1 is the initial adjustment voltage of the first generator, U2 is the initial adjustment voltage of the second generator, and X 2′ is the equivalent reactance of a split winding on the low-voltage side of the transformer, X 2″ is the equivalent reactance of the two split windings on the low-voltage side of the transformer, the first generator is connected to one split winding on the low-voltage side of the transformer, and the second generator is connected to the two split windings on the low-voltage side of the transformer; when the combined generator includes more than two generators, it can be set in a manner corresponding to the circulating current value calculation method for the above two generators, and this embodiment does not impose any restrictions on this.

[0061] Step 104: Adjust the terminal voltage of the combined generator according to the circulating current value.

[0062] It can be understood that in this step, the processor can adjust the terminal voltage of the joint generator based on the calculated circulating current value between each joint generator, so as to provide a more reasonable reactive power distribution for the joint generator on the basis of the original reactive power distribution plan, thereby achieving the goal of reducing the reactive circulating current between the joint generators of the power plant and reducing power loss.

[0063] Specifically, the specific manner in which the processor adjusts the machine-end voltage of the combined generator according to the circulating current value in this step can be set by the designer. For example, the processor can determine whether it is necessary to continue adjusting the machine-end voltage of the combined generator by comparing the circulating current value with a preset range; for example, the processor can determine whether the circulating current value is greater than a first threshold; if so, the machine-end voltage of the combined generator can be adjusted; if not, the process can be terminated directly.

[0064] Correspondingly, the specific manner in which the processor adjusts the terminal voltage of the combined generator can be set by the designer. For example, when the combined generator includes a first generator and a second generator, the processor can determine the adjusted terminal voltages of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltages of the first generator and the second generator; for example, if the first current terminal voltage is greater than the second current terminal voltage (U1>U2), the processor can determine the difference between the first current terminal voltage and the preset adjustment voltage (U1-ΔU) as the first adjusted terminal voltage, and determine the sum of the second current terminal voltage and the preset adjustment voltage (U2+ΔU) as the second adjusted terminal voltage, so that the first current terminal voltage can be adjusted by the processor to the first terminal voltage. The AVRs of the generator and the second generator send corresponding instructions to adjust the terminal voltages of the first generator and the second generator to the corresponding adjusted terminal voltages; if the first current terminal voltage is not greater than the second current terminal voltage (U1≤U2), the sum of the first current terminal voltage and the preset adjusted voltage (U1+ΔU) is determined as the first adjusted terminal voltage, and the difference between the second current terminal voltage and the preset adjusted voltage (U2-ΔU) is determined as the second adjusted terminal voltage; wherein, the first current terminal voltage and the first adjusted terminal voltage are the current terminal voltage and the adjusted terminal voltage of the first generator, respectively, and the second current terminal voltage and the second adjusted terminal voltage are the current terminal voltage and the adjusted terminal voltage of the second generator, respectively. When the combined generator includes a first generator, a second generator and a third generator, the processor can determine the adjusted terminal voltages of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltages of the first generator, the second generator and the third generator; for example, the difference between the maximum value of the current terminal voltages of the first generator, the second generator and the third generator and the preset adjustment voltage is determined as the adjusted terminal voltage of the generator, the sum of the minimum value of the current terminal voltages of the first generator, the second generator and the third generator and the preset adjustment voltage is determined as the adjusted terminal voltage of the generator, and the intermediate value of the current terminal voltages of the first generator, the second generator and the third generator is determined as the adjusted terminal voltage of the generator.

[0065] Correspondingly, after determining the adjusted terminal voltages of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltages of the first generator and the second generator, it is also possible to sequentially or separately determine whether the absolute value of the difference between the adjusted terminal voltages of the first generator and the second generator is less than the second threshold and whether the number of adjustments reaches the number threshold (such as 20 times); if the absolute value is less than the second threshold or the number of adjustments reaches the number threshold, the terminal voltage of the combined generator is adjusted according to the adjusted terminal voltages of the first generator and the second generator; if the absolute value is not less than the second threshold and the number of adjustments does not reach the number threshold, the number of adjustments can be increased by 1, and the adjusted terminal voltages of the first generator and the second generator are determined as the current terminal voltages of the first generator and the second generator, and return to the step of determining the adjusted terminal voltages of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltages of the first generator and the second generator. For example, the processor may determine whether the absolute value of the difference between the adjusted terminal voltages of the first and second generators is less than a second threshold; if so, adjust the terminal voltage of the combined generator based on the adjusted terminal voltages of the first and second generators; if not, determine whether the number of adjustments has reached a threshold; if so, perform the step of adjusting the terminal voltage of the combined generator based on the adjusted terminal voltages of the first and second generators; if not, increment the number of adjustments by 1, determine the adjusted terminal voltage of the combined generator based on the adjusted terminal voltages of the first and second generators, and perform the step of determining the adjusted terminal voltages of the first and second generators based on the preset adjusted voltage and the current terminal voltages of the first and second generators. The processor may also determine whether the circulating current value corresponding to the adjusted terminal voltages of the first and second generators is less than the first threshold, which is not limited in this embodiment.

[0066] The first threshold and the second threshold may be the same value or different values, and this embodiment does not impose any limitation on this.

[0067] In this embodiment, the embodiment of the present invention calculates the circulating current value between each joint generator based on the initial adjustment voltage, and can calculate the circulating current value between the joint generators operating in parallel in the power plant according to the original reactive power distribution, so as to adjust the terminal voltage of the joint generator based on the calculated circulating current value, provide a more reasonable reactive power distribution for the joint generator, achieve the goal of reducing the reactive circulating current between the joint generators in the power plant, and reduce the power loss.

[0068] Corresponding to the above method embodiment, an embodiment of the present invention further provides a voltage-controlled reactive power distribution device. The voltage-controlled reactive power distribution device described below and the voltage-controlled reactive power distribution method described above can refer to each other.

[0069] Please refer to Figure 4 , Figure 4 This is a structural block diagram of a voltage-controlled reactive power distribution device provided by an embodiment of the present invention. The device may include:

[0070] The reactive power calculation module 10 is used to obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator;

[0071] The voltage initial adjustment module 20 is used to perform initial adjustment on the terminal voltage of each joint generator according to the required reactive power value, and obtain the initial adjustment voltage of each joint generator;

[0072] The circulating current calculation module 30 is used to calculate the circulating current value between each joint generator according to the initial voltage adjustment;

[0073] The voltage adjustment module 40 is used to adjust the terminal voltage of the combined generator according to the circulating current value.

[0074] Optionally, the reactive power calculation module 10 may include:

[0075] The total reactive power calculation submodule is used to calculate the total distributed reactive power value corresponding to the high-voltage side bus voltage according to the high-voltage side bus voltage and voltage control instructions;

[0076] The distribution calculation submodule is used to calculate the required reactive power value based on the total distributed reactive power value and the short-circuit capacity of each joint generator.

[0077] Optionally, the allocation calculation submodule may include:

[0078] The short-circuit capacity calculation unit is used to calculate the short-circuit reactance of each combined generator through Calculate the short-circuit capacity of each combined generator; where S g is the short-circuit capacity of any combined generator, X g is the short-circuit reactance of any combined generator, S N is the baseline capacity;

[0079] The distributed reactive power calculation unit is used to calculate the total reactive power value of each combined generator according to its short-circuit capacity. Calculate the required reactive power; where ΔQ1 is the required reactive power of the first generator, ΔQ2 is the required reactive power of the first generator, ΔQ is the total distributed reactive power, S g1 is the short-circuit capacity of the first generator, S g2 is the short-circuit capacity of the second generator.

[0080] Optionally, when the combined generator includes a first generator and a second generator, the circulating current calculation module 30 may be specifically configured to calculate the current by: Calculate the circulating current value; where ΔI is the circulating current value, U1 is the initial adjustment voltage of the first generator, U2 is the initial adjustment voltage of the second generator, and X 2′ is the equivalent reactance of a split winding on the low-voltage side of the transformer, X 2″ is the equivalent reactance of the two split windings on the low-voltage side of the transformer. The first generator is connected to one split winding on the low-voltage side of the transformer, and the second generator is connected to the two split windings on the low-voltage side of the transformer.

[0081] Optionally, the voltage adjustment module 40 may include:

[0082] A judgment submodule, used to judge whether the circulation value is greater than a first threshold;

[0083] The voltage adjustment submodule is used to adjust the terminal voltage of the combined generator if the voltage is greater than a first threshold.

[0084] Optionally, when the combined generator includes a first generator and a second generator, the voltage adjustment submodule may include:

[0085] an adjustment determination unit, configured to determine the adjusted terminal voltages of the first generator and the second generator according to a preset adjustment voltage and the current terminal voltages of the first generator and the second generator;

[0086] a first determining unit configured to determine whether the absolute value of the difference between the regulated terminal voltages of the first generator and the second generator is less than a second threshold; if so, sending a start signal to the voltage regulating unit; if not, sending a start signal to the second determining unit;

[0087] A second judgment unit is configured to judge whether the number of adjustments reaches a threshold value based on the received start signal; if so, send a start signal to the voltage adjustment unit; if not, send a start signal to the iteration unit;

[0088] a voltage adjustment unit, configured to adjust the terminal voltage of the combined generator according to the received start signal and the adjusted terminal voltages of the first generator and the second generator;

[0089] The iterative unit is used to add 1 to the adjustment times according to the received start signal, determine the adjusted terminal voltages of the first generator and the second generator as the current terminal voltages of the first generator and the second generator, and send a start signal to the adjustment determination unit.

[0090] Optionally, the adjustment determination unit can specifically determine the difference between the first current machine-end voltage and the preset adjustment voltage as the first adjustment machine-end voltage, and determine the sum of the second current machine-end voltage and the preset adjustment voltage as the second adjustment machine-end voltage if the first current machine-end voltage is greater than the second current machine-end voltage; if the first current machine-end voltage is not greater than the second current machine-end voltage, determine the sum of the first current machine-end voltage and the preset adjustment voltage as the first adjustment machine-end voltage, and determine the difference between the second current machine-end voltage and the preset adjustment voltage as the second adjustment machine-end voltage; wherein the first current machine-end voltage and the first adjustment machine-end voltage are respectively the current machine-end voltage and the adjustment machine-end voltage of the first generator, and the second current machine-end voltage and the second adjustment machine-end voltage are respectively the current machine-end voltage and the adjustment machine-end voltage of the second generator.

[0091] In this embodiment, the embodiment of the present invention calculates the circulating current value between each joint generator according to the initial adjustment voltage through the circulating current calculation module 30, and can calculate the circulating current value between the joint generators operating in parallel in the power plant according to the original reactive power distribution, so that the terminal voltage of the joint generator is adjusted according to the calculated circulating current value, providing a more reasonable reactive power distribution for the joint generator, achieving the goal of reducing the reactive circulating current between the joint generators in the power plant, and reducing power loss.

[0092] Corresponding to the above method embodiment, an embodiment of the present invention further provides a voltage-controlled reactive power distribution device. The voltage-controlled reactive power distribution device described below and the voltage-controlled reactive power distribution method described above can refer to each other.

[0093] An embodiment of the present invention provides a voltage-controlled reactive power distribution device, comprising: a memory for storing a computer program; and a processor for implementing the steps of the voltage-controlled reactive power distribution method provided in the above method embodiment when executing the computer program.

[0094] The voltage-controlled reactive power distribution device provided in this embodiment may specifically be an AVC device.

[0095] Corresponding to the above method embodiment, an embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium described below and the voltage-controlled reactive power distribution method described above can refer to each other.

[0096] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the voltage-controlled reactive power distribution method provided in the above method embodiment are implemented.

[0097] The computer-readable storage medium may specifically be any storage medium capable of storing program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. References to the common and similar parts between the various embodiments are sufficient. The devices, apparatuses, and computer-readable storage media disclosed in the embodiments are described briefly because they correspond to the methods disclosed in the embodiments. For relevant details, refer to the description of the methods.

[0099] The above is a detailed introduction to the voltage-controlled reactive power distribution method, device, equipment and computer-readable storage medium provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A voltage-controlled reactive power distribution method, characterized in that: include: Obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator; performing preliminary adjustment on the terminal voltage of each of the combined generators according to the required reactive power value to obtain the preliminary adjusted voltage of each of the combined generators; Calculating circulating current values ​​between the combined generators according to the initial adjustment voltage; adjusting the terminal voltage of the combined generator according to the circulating current value; The step of obtaining the required reactive power value of each generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator includes: Calculating a total distributed reactive value corresponding to the high-voltage side bus voltage according to the high-voltage side bus voltage and the voltage control instruction; Calculating the required reactive power value according to the total distributed reactive power value and the short-circuit capacity of each of the combined generators; Wherein, when the combined generator includes a first generator and a second generator, calculating the required reactive value according to the total distributed reactive value and the short-circuit capacity of each combined generator includes: According to the short-circuit reactance of each combined generator, Calculate the short-circuit capacity of each of the combined generators; where S g is the short-circuit capacity of any of the combined generators, X g is the short-circuit reactance of any of the combined generators, S N is the baseline capacity; According to the short-circuit capacity of each joint generator and the total distributed reactive value, Calculate the required reactive value; where ΔQ1 is the required reactive value of the first generator, ΔQ2 is the required reactive value of the second generator, ΔQ is the total distributed reactive value, S g1 is the short-circuit capacity of the first generator, S g2 is the short-circuit capacity of the second generator.

2. The voltage-controlled reactive power distribution method according to claim 1, characterized in that: When the combined generator includes a first generator and a second generator, calculating the circulating current value between the combined generators according to the initial adjustment voltage includes: pass Calculate the circulating current value; wherein ΔI is the circulating current value, U1 is the initial adjustment voltage of the first generator, U2 is the initial adjustment voltage of the second generator, X 2′ is the equivalent reactance of a split winding on the low-voltage side of the transformer, X 2″ is the equivalent reactance of the two split windings on the low-voltage side of the transformer, the first generator is connected to one split winding on the low-voltage side of the transformer, and the second generator is connected to the two split windings on the low-voltage side of the transformer.

3. The voltage-controlled reactive power distribution method according to claim 1 or 2, characterized in that: The adjusting the terminal voltage of the combined generator according to the circulating current value includes: Determining whether the circulation value is greater than a first threshold; If so, the terminal voltage of the combined generator is adjusted.

4. The voltage-controlled reactive power distribution method according to claim 3, characterized in that: When the combined generator includes a first generator and a second generator, adjusting the terminal voltage of the combined generator includes: determining an adjusted terminal voltage of the first generator and the second generator according to a preset adjusted voltage and the current terminal voltage of the first generator and the second generator; determining whether an absolute value of a difference between the regulated terminal voltages of the first generator and the second generator is less than a second threshold; If so, adjusting the terminal voltage of the combined generator according to the adjusted terminal voltages of the first generator and the second generator; If not, determine whether the number of adjustments reaches the number threshold; If the number threshold is reached, performing the step of adjusting the terminal voltage of the combined generator according to the adjusted terminal voltages of the first generator and the second generator; If the number threshold is not reached, the number of adjustments is increased by 1, and the adjusted terminal voltage of the first generator and the second generator is determined as the current terminal voltage of the first generator and the second generator, and the step of determining the adjusted terminal voltage of the first generator and the second generator based on the preset adjustment voltage and the current terminal voltage of the first generator and the second generator is performed.

5. The voltage-controlled reactive power distribution method according to claim 4, characterized in that: The determining the adjusted terminal voltages of the first generator and the second generator according to the preset adjusted voltage and the current terminal voltages of the first generator and the second generator includes: If the first current generator-end voltage is greater than the second current generator-end voltage, the difference between the first current generator-end voltage and the preset adjusted voltage is determined as the first adjusted generator-end voltage, and the sum of the second current generator-end voltage and the preset adjusted voltage is determined as the second adjusted generator-end voltage; wherein the first current generator-end voltage and the first adjusted generator-end voltage are respectively the current generator-end voltage and the adjusted generator-end voltage of the first generator, and the second current generator-end voltage and the second adjusted generator-end voltage are respectively the current generator-end voltage and the adjusted generator-end voltage of the second generator; If the first current machine-end voltage is not greater than the second current machine-end voltage, the sum of the first current machine-end voltage and the preset adjustment voltage is determined as the first adjusted machine-end voltage, and the difference between the second current machine-end voltage and the preset adjustment voltage is determined as the second adjusted machine-end voltage.

6. A voltage-controlled reactive power distribution device, characterized in that: include: The reactive power calculation module is used to obtain the required reactive power value of each joint generator according to the high-voltage side bus voltage and the voltage control instruction of the joint generator; A voltage initial adjustment module, configured to perform initial adjustment on the terminal voltage of each of the combined generators according to the required reactive power value, and obtain an initial adjustment voltage of each of the combined generators; a circulating current calculation module, configured to calculate the circulating current value between each of the joint generators according to the initial adjustment voltage; a voltage adjustment module, configured to adjust the terminal voltage of the combined generator according to the circulating current value; Wherein, the reactive power calculation module includes: A total reactive power calculation submodule, configured to calculate a total distributed reactive power value corresponding to the high-voltage side bus voltage according to the high-voltage side bus voltage and the voltage control instruction; a distribution calculation submodule, configured to calculate the required reactive power value according to the total distributed reactive power value and the short-circuit capacity of each of the joint generators; The allocation calculation submodule includes: The short-circuit capacity calculation unit is used to calculate the short-circuit reactance of each combined generator by Calculate the short-circuit capacity of each of the combined generators; where S g is the short-circuit capacity of any of the combined generators, X g is the short-circuit reactance of any of the combined generators, S N is the baseline capacity; The distributed reactive power calculation unit is used to calculate the total reactive power value according to the short-circuit capacity of each joint generator. Calculate the required reactive value; where ΔQ1 is the required reactive value of the first generator, ΔQ2 is the required reactive value of the second generator, ΔQ is the total distributed reactive value, S g1 is the short-circuit capacity of the first generator, S g2 is the short-circuit capacity of the second generator.

7. A voltage-controlled reactive power distribution device, characterized in that: include: Memory for storing computer programs; A processor is configured to implement the steps of the voltage-controlled reactive power distribution method according to any one of claims 1 to 5 when executing the computer program.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the voltage-controlled reactive power distribution method according to any one of claims 1 to 5 are implemented.

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