CN116244947A - Load characteristic optimization method and device of variable frequency air conditioner - Google Patents
Load characteristic optimization method and device of variable frequency air conditioner Download PDFInfo
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Abstract
The invention discloses a method, a device and a storage medium for optimizing load characteristics of a variable frequency air conditioner, wherein the method comprises the following steps: the control test equipment sequentially controls the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator; controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus to the test equipment under a plurality of preset input voltage values; the control test equipment generates active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value; according to the active power and the reactive power, a load characteristic curve of the variable-frequency air conditioner is generated, a load characteristic model is constructed according to the load characteristic curve, and the load characteristic of the variable-frequency air conditioner is subjected to simulation optimization calculation, so that the calculation accuracy of the load characteristic of the variable-frequency air conditioner is improved, and the simulation calculation accuracy of an electric power system is improved.
Description
Technical Field
The invention relates to the technical field of simulation modeling of power systems, in particular to a method and a device for optimizing load characteristics of a variable-frequency air conditioner and a storage medium.
Background
In the past, load modeling technology is the key and difficult point of electric power system research, and for electric power system digital simulation, the accuracy of load model has very important influence on it. When the power load is modeled in the past, the variable frequency air conditioner is treated as the fixed frequency air conditioner, because the variable frequency air conditioner occupies less space, the influence on the accuracy of the load model is small, the refrigerating load of the air conditioner is increased excessively with the appearance of extremely high temperature weather, the load of the variable frequency air conditioner is also increased rapidly, the proportion of the variable frequency air conditioner in the Guangdong province air conditioner load is up to 60 percent, and if the variable frequency air conditioner load is treated as the fixed frequency air conditioner simply, the load model is inaccurate, and the simulation calculation result is incorrect.
Therefore, research on the load characteristics of the variable frequency air conditioner is needed, a high-precision variable frequency air conditioner load model is established, and the accuracy of power grid simulation calculation is improved.
Disclosure of Invention
The invention provides a method, a device and a storage medium for optimizing load characteristics of a variable frequency air conditioner, which are used for improving the calculation accuracy of the load characteristics of the variable frequency air conditioner and improving the simulation calculation accuracy of an electric power system.
In order to achieve improvement of load characteristic calculation accuracy of a variable frequency air conditioner, the embodiment of the invention provides an optimization method of load characteristics of the variable frequency air conditioner, which comprises the following steps: the control test equipment sequentially controls the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of a grid-connected bus to the test equipment under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
and generating a load characteristic curve of the variable-frequency air conditioner according to the active power and the reactive power, constructing a load characteristic model according to the load characteristic curve, and performing simulation optimization calculation on the load characteristic of the variable-frequency air conditioner.
As a preferred scheme, the invention changes the input voltage of the variable frequency air conditioner by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator, and the current value of the variable frequency air conditioner and the voltage value of the grid-connected bus under a plurality of preset input voltage values can reach the active power and the reactive power of the variable frequency air conditioner, and the load characteristic of the variable frequency air conditioner can be accurately determined through the active power and the reactive power, so that the load characteristic model carries out simulation optimization calculation on the load characteristic of the variable frequency air conditioner, the variable frequency air conditioner load is not simply treated as a fixed frequency air conditioner, the simulation calculation accuracy of the electric power system is improved, and powerful technical support is provided for the analysis and decision of the electric network.
As a preferred scheme, the input voltage of the variable frequency air conditioner is controlled to be a plurality of preset input voltage values in sequence, specifically:
and in the variation range of the preset input voltage, controlling the input voltage of the variable-frequency air conditioner to change according to the preset variation step length to obtain a plurality of preset input voltage values.
As a preferable scheme, the invention controls the input voltage of the variable-frequency air conditioner to change according to the preset step length, and can calculate the active power and the reactive power under a plurality of input voltages, thereby calculating the load characteristic, improving the simulation calculation accuracy of the power system and providing powerful technical support for the analysis decision of the power grid.
As a preferred scheme, the variable frequency air conditioner is controlled to feed back a current value of the variable frequency air conditioner and a voltage value of a grid-connected bus to the test equipment under a plurality of preset input voltage values, and the test equipment is controlled to generate active power and reactive power of the variable frequency air conditioner according to the current value and the voltage value, specifically:
according to a preset change step length, controlling test equipment to acquire a current value of a corresponding variable-frequency air conditioner and a voltage value of a grid-connected bus every time the input voltage value changes;
according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, calculating active power P and reactive power Q;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive power is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
As a preferable scheme, the invention controls the input voltage of the variable-frequency air conditioner to change according to the preset step length, and can calculate the active power and the reactive power under a plurality of input voltages according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, thereby accurately calculating the load characteristic, improving the simulation calculation accuracy of the power system and providing powerful technical support for the analysis and decision of the power grid.
As a preferred scheme, according to the active power and the reactive power, a load characteristic curve of the variable frequency air conditioner is generated, and according to the load characteristic curve, a load characteristic model is constructed, specifically:
drawing an active power-voltage and reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
and constructing a load characteristic model of the variable frequency air conditioner load by using a least square curve fitting method.
As a preferable scheme, the invention constructs the load characteristic mathematical model of the load of the variable-frequency air conditioner according to the active power-voltage and reactive power-voltage characteristic curves of the variable-frequency air conditioner, can accurately calculate the load characteristic of the variable-frequency air conditioner, improves the simulation calculation accuracy of the power system, and provides powerful technical support for the analysis decision of the power grid.
Correspondingly, the invention also provides a device for optimizing the load characteristic of the variable frequency air conditioner, which comprises the following steps: the power control device comprises a voltage control module, a power calculation module and a load characteristic calculation module;
the voltage control module is used for controlling the testing equipment to sequentially control the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the power calculation module is used for controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus to the test equipment under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
the load characteristic calculation module is used for generating a load characteristic curve of the variable-frequency air conditioner according to the active power and the reactive power, constructing a load characteristic model according to the load characteristic curve, and performing simulation optimization calculation on the load characteristic of the variable-frequency air conditioner.
As a preferred scheme, the device adjusts the voltages of the machine ends of an infinite equivalent alternating current system and an equivalent generator through the voltage control module, so that the input voltage of the variable frequency air conditioner is changed, the power calculation module can accurately determine the load characteristics of the variable frequency air conditioner through the active power and the reactive power according to the current values of the variable frequency air conditioner and the voltage values of the grid-connected buses under a plurality of preset input voltage values, so that the load characteristics of the variable frequency air conditioner are simulated and optimally calculated through the load characteristic model, the variable frequency air conditioner load is not treated as a fixed frequency air conditioner simply, the simulation calculation accuracy of the power system is improved, and powerful technical support is provided for power grid analysis decision.
Preferably, the voltage control module comprises an adjusting unit and a control unit;
the adjusting unit is used for adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the control unit is used for controlling the input voltage of the variable-frequency air conditioner to change according to a preset change step length within the change range of the preset input voltage, so as to obtain a plurality of preset input voltage values.
As a preferred scheme, the device controls the input voltage of the variable-frequency air conditioner to change according to a preset step length, and can calculate the active power and the reactive power under a plurality of input voltages according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, thereby accurately calculating the load characteristic, improving the simulation calculation accuracy of the power system,
as a preferred solution, the power calculation module includes an acquisition unit and a calculation unit;
the acquisition unit is used for controlling the test equipment to acquire the current value of the corresponding variable-frequency air conditioner and the voltage value of the grid-connected bus according to the preset change step length and each time the input voltage value changes;
the calculating unit is used for calculating active power P and reactive power Q according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive power is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
As a preferable scheme, the device acquisition unit controls the input voltage of the variable-frequency air conditioner to change according to a preset step length, and the calculation unit can calculate the active power and the reactive power under a plurality of input voltages according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, so that the load characteristic is accurately calculated, the simulation calculation accuracy of the power system is improved, and a powerful technical support is provided for analysis and decision of the power grid.
As a preferable mode, the load characteristic calculation module includes a drawing unit and a model construction unit;
the drawing unit is used for drawing an active power-voltage characteristic curve and a reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
the model construction unit is used for constructing a load characteristic model of the variable-frequency air conditioner load by utilizing a least square curve fitting method.
As an optimal scheme, the device drawing unit draws the active power-voltage and reactive power-voltage characteristic curves of the variable-frequency air conditioner, the model construction unit constructs a load characteristic mathematical model of the load of the variable-frequency air conditioner according to the characteristic curves, the load characteristic of the variable-frequency air conditioner can be accurately calculated, the simulation calculation accuracy of an electric power system is improved, and a powerful technical support is provided for analysis and decision of an electric network.
Accordingly, the present invention also provides a computer-readable storage medium including a stored computer program; the computer program controls the equipment where the computer readable storage medium is located to execute the method for optimizing the load characteristic of the variable frequency air conditioner according to the content of the invention when running.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a method for optimizing load characteristics of a variable frequency air conditioner according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of an optimizing system for load characteristics of a variable frequency air conditioner according to the optimizing method for load characteristics of a variable frequency air conditioner provided by the invention; wherein G1 and G2 are equivalent generators; L1-L3 are lines; t1 and T2 are step-down transformers; b3 is a circuit breaker; PT is a distribution transformer; BK1-BK5 and K1 are switches;
FIG. 3 is a graph showing the comparison between an actual measurement curve of active power and voltage of a variable frequency air conditioner and an active power and voltage curve of an equivalent model according to an embodiment of the method for optimizing load characteristics of the variable frequency air conditioner;
fig. 4 is a graph comparing a reactive power-voltage measured curve of a variable frequency air conditioner with a reactive power-voltage curve of an equivalent model according to an embodiment of a method for optimizing load characteristics of the variable frequency air conditioner provided by the invention;
fig. 5 is a schematic structural diagram of an embodiment of a device for optimizing load characteristics of a variable frequency air conditioner according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a method for optimizing load characteristics of a variable frequency air conditioner according to an embodiment of the present invention includes steps S101 to S103:
step S101: the control test equipment sequentially controls the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
in this embodiment, the optimization method is applied to an optimization system of load characteristics of a variable frequency air conditioner, where the optimization system includes: test equipment, an infinite equivalent alternating current module, an equivalent generator, a step-down transformer, a distribution transformer, a circuit, a 1500V bus, a 660V bus, a 220V bus, a circuit breaker and a load element (namely a variable frequency air conditioner);
referring to FIG. 2, an infinite equivalent alternating current module and equivalent generators G1 and G2 are connected with a 1500V busbar through lines L1 and L2; the high voltage sides of the step-down transformers T1 and T2 are connected with 1500V buses, and the low voltage sides of the step-down transformers T1 and T2 are connected with 660V buses; the 660V bus is connected with the high-voltage side of a distribution transformer PT through a breaker B3, and the 220V bus on the low-voltage side of the distribution transformer PT is connected with a variable-frequency air conditioner; BK1-BK5 and K1 are switches and L1-L3 are lines.
In this embodiment, the input voltage of the variable frequency air conditioner is controlled to a plurality of preset input voltage values in sequence, specifically:
and in the variation range of the preset input voltage, controlling the input voltage of the variable-frequency air conditioner to change according to the preset variation step length to obtain a plurality of preset input voltage values.
In the embodiment, the frequency of the optimizing system is kept basically unchanged, the input voltage of the variable-frequency air conditioner is changed, the voltage change range is from 180V to 240V, and the voltage change step length is 0.1V.
Step S102: controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of a grid-connected bus to the test equipment under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
in this embodiment, the variable frequency air conditioner is controlled to feed back a current value of the variable frequency air conditioner and a voltage value of a grid-connected bus to the test device under a plurality of preset input voltage values, and the test device is controlled to generate active power and reactive power of the variable frequency air conditioner according to the current value and the voltage value, specifically:
according to a preset change step length, controlling test equipment to acquire a current value of a corresponding variable-frequency air conditioner and a voltage value of a grid-connected bus every time the input voltage value changes;
according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, calculating active power P and reactive power Q;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive powerThe ratio is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
In this embodiment, according to the step length of voltage change, after each time of voltage change, the corresponding current flowing through the variable-frequency air conditioner and the voltage of the grid-connected bus of the variable-frequency air conditioner are obtained, and the active power value and the reactive power value of the variable-frequency air conditioner are calculated:
step S103: and generating a load characteristic curve of the variable-frequency air conditioner according to the active power and the reactive power, constructing a load characteristic model according to the load characteristic curve, and performing simulation optimization calculation on the load characteristic of the variable-frequency air conditioner.
In this embodiment, a load characteristic curve of the variable frequency air conditioner is generated according to the active power and the reactive power, and a load characteristic model is constructed according to the load characteristic curve, specifically:
drawing an active power-voltage and reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
and constructing a load characteristic model of the variable frequency air conditioner load by using a least square curve fitting method.
Referring to fig. 3, two curves in fig. 3 are respectively active power-voltage characteristic curves of actual measurement data of the variable frequency air conditioner and calculated through load characteristic model (ZIP model) simulation and optimization;
referring to fig. 4, two curves in fig. 4 are reactive power-voltage characteristic curves of actual measurement data of the variable frequency air conditioner and calculated through load characteristic model (ZIP model) simulation and optimization, respectively;
in this embodiment, the active power load characteristic of the inverter air conditioner may be regarded as a constant power characteristic, and the reactive power load characteristic thereof may be regarded as a constant impedance characteristic.
The implementation of the embodiment of the invention has the following effects:
according to the invention, the input voltage of the variable frequency air conditioner is changed by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator, the current value of the variable frequency air conditioner and the voltage value of the grid-connected bus are reduced by a plurality of preset input voltage values, the active power and the reactive power of the variable frequency air conditioner can be obtained, and the load characteristic of the variable frequency air conditioner can be accurately determined by the active power and the reactive power, so that the load characteristic model carries out simulation optimization calculation on the load characteristic of the variable frequency air conditioner, the load of the variable frequency air conditioner is not simply treated as a fixed frequency air conditioner, the simulation calculation accuracy of the electric power system is improved, and powerful technical support is provided for the analysis and decision of the electric network.
Example two
Referring to fig. 5, an apparatus for optimizing load characteristics of a variable frequency air conditioner according to an embodiment of the present invention includes: a voltage control module 201, a power calculation module 202, and a load characteristic calculation module 203;
the voltage control module 201 is used for controlling the testing equipment to sequentially control the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the power calculation module 202 is configured to control the variable-frequency air conditioner to feed back a current value of the variable-frequency air conditioner and a voltage value of a grid-connected bus to the test device under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
the load characteristic calculation module 203 is configured to generate a load characteristic curve of the variable frequency air conditioner according to the active power and the reactive power, construct a load characteristic model according to the load characteristic curve, and perform simulation optimization calculation on the load characteristic of the variable frequency air conditioner.
The voltage control module 201 includes an adjustment unit and a control unit;
the adjusting unit is used for adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the control unit is used for controlling the input voltage of the variable-frequency air conditioner to change according to a preset change step length within the change range of the preset input voltage, so as to obtain a plurality of preset input voltage values.
The power calculation module 202 includes an acquisition unit and a calculation unit;
the acquisition unit is used for controlling the test equipment to acquire the current value of the corresponding variable-frequency air conditioner and the voltage value of the grid-connected bus according to the preset change step length and each time the input voltage value changes;
the calculating unit is used for calculating active power P and reactive power Q according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive power is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
The load characteristic calculation module 203 includes a drawing unit and a model construction unit;
the drawing unit is used for drawing an active power-voltage characteristic curve and a reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
the model construction unit is used for constructing a load characteristic model of the variable-frequency air conditioner load by utilizing a least square curve fitting method.
The load characteristic optimizing device of the variable frequency air conditioner can implement the load characteristic optimizing method of the variable frequency air conditioner in the method embodiment. The options in the method embodiments described above are also applicable to this embodiment and will not be described in detail here. The rest of the embodiments of the present application may refer to the content of the method embodiments described above, and in this embodiment, no further description is given.
The implementation of the embodiment of the invention has the following effects:
the device adjusts the machine end voltage of an infinite equivalent alternating current system and an equivalent generator through the voltage control module, so that the input voltage of the variable frequency air conditioner is changed, the power calculation module can accurately determine the load characteristic of the variable frequency air conditioner through the active power and the reactive power according to the current value of the variable frequency air conditioner and the voltage value of the grid-connected bus under a plurality of preset input voltage values, so that the load characteristic model carries out simulation optimization calculation on the load characteristic of the variable frequency air conditioner, the variable frequency air conditioner load is not treated as a fixed frequency air conditioner simply, the simulation calculation accuracy of the power system is improved, and powerful technical support is provided for power grid analysis decision.
Example III
Correspondingly, the invention further provides a computer readable storage medium, which comprises a stored computer program, wherein the computer program is used for controlling equipment where the computer readable storage medium is located to execute the method for optimizing the load characteristic of the variable frequency air conditioner according to any embodiment.
The computer program may be divided into one or more modules/units, which are stored in the memory and executed by the processor to accomplish the present invention, for example. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program in the terminal device.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.
The memory may be used to store the computer program and/or the module, and the processor may implement various functions of the terminal device by running or executing the computer program and/or the module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the mobile terminal, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the terminal device integrated modules/units may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as stand alone products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. The method for optimizing the load characteristic of the variable frequency air conditioner is characterized by comprising the following steps of:
the control test equipment sequentially controls the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of a grid-connected bus to the test equipment under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
and generating a load characteristic curve of the variable-frequency air conditioner according to the active power and the reactive power, constructing a load characteristic model according to the load characteristic curve, and performing simulation optimization calculation on the load characteristic of the variable-frequency air conditioner.
2. The method for optimizing load characteristics of a variable frequency air conditioner according to claim 1, wherein the step of sequentially controlling the input voltage of the variable frequency air conditioner to a plurality of preset input voltage values is specifically as follows:
and in the variation range of the preset input voltage, controlling the input voltage of the variable-frequency air conditioner to change according to the preset variation step length to obtain a plurality of preset input voltage values.
3. The method for optimizing load characteristics of a variable frequency air conditioner according to claim 2, wherein the controlling the variable frequency air conditioner feeds back a current value of the variable frequency air conditioner and a voltage value of a grid-connected bus to the testing device under a plurality of preset input voltage values, and the controlling the testing device generates active power and reactive power of the variable frequency air conditioner according to the current value and the voltage value, specifically comprises:
according to a preset change step length, controlling test equipment to acquire a current value of a corresponding variable-frequency air conditioner and a voltage value of a grid-connected bus every time the input voltage value changes;
according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus, calculating active power P and reactive power Q;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive power is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
4. The method for optimizing load characteristics of a variable frequency air conditioner according to claim 3, wherein the generating a load characteristic curve of the variable frequency air conditioner according to the active power and the reactive power, and constructing a load characteristic model according to the load characteristic curve comprises the following steps:
drawing an active power-voltage and reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
and constructing a load characteristic model of the variable frequency air conditioner load by using a least square curve fitting method.
5. An optimizing apparatus for load characteristics of a variable frequency air conditioner, comprising: the power control device comprises a voltage control module, a power calculation module and a load characteristic calculation module;
the voltage control module is used for controlling the testing equipment to sequentially control the input voltage of the variable-frequency air conditioner into a plurality of preset input voltage values by adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the power calculation module is used for controlling the variable-frequency air conditioner to feed back the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus to the test equipment under a plurality of preset input voltage values; controlling test equipment to generate active power and reactive power of the variable-frequency air conditioner according to the current value and the voltage value;
the load characteristic calculation module is used for generating a load characteristic curve of the variable-frequency air conditioner according to the active power and the reactive power, constructing a load characteristic model according to the load characteristic curve, and performing simulation optimization calculation on the load characteristic of the variable-frequency air conditioner.
6. The optimizing apparatus of load characteristics of a variable frequency air conditioner according to claim 5, wherein the voltage control module comprises an adjusting unit and a control unit;
the adjusting unit is used for adjusting the voltages of the machine ends of the infinite equivalent alternating current system and the equivalent generator;
the control unit is used for controlling the input voltage of the variable-frequency air conditioner to change according to a preset change step length within the change range of the preset input voltage, so as to obtain a plurality of preset input voltage values.
7. The optimizing apparatus for load characteristics of a variable frequency air conditioner according to claim 5, wherein said power calculation module comprises an acquisition unit and a calculation unit;
the acquisition unit is used for controlling the test equipment to acquire the current value of the corresponding variable-frequency air conditioner and the voltage value of the grid-connected bus according to the preset change step length and each time the input voltage value changes;
the calculating unit is used for calculating active power P and reactive power Q according to the current value of the variable-frequency air conditioner and the voltage value of the grid-connected bus;
the active power is as follows: p=p 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is 0 The active power initial value of the variable frequency air conditioner;
the reactive power is:
wherein Q is 0 The reactive power initial value of the variable frequency air conditioner is U, which is the voltage value of the grid-connected bus of the variable frequency air conditioner 0 The voltage initial value of the grid-connected bus of the variable-frequency air conditioner is obtained.
8. The optimizing apparatus of load characteristics of a variable frequency air conditioner according to claim 5, wherein the load characteristic calculation module includes a drawing unit and a model construction unit;
the drawing unit is used for drawing an active power-voltage characteristic curve and a reactive power-voltage characteristic curve of the variable-frequency air conditioner according to the relation between the input voltage value and the corresponding active power and reactive power;
the model construction unit is used for constructing a load characteristic model of the variable-frequency air conditioner load by utilizing a least square curve fitting method.
9. A computer readable storage medium, wherein the computer readable storage medium comprises a stored computer program; wherein the computer program, when running, controls a device in which the computer readable storage medium is located to perform the method for optimizing the load characteristics of a variable frequency air conditioner according to any one of claims 1 to 4.
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