CN117833244A - Energy-saving electrical appliance current distortion suppression method and system based on harmonic source coupling - Google Patents
Energy-saving electrical appliance current distortion suppression method and system based on harmonic source coupling Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method and a system, which relate to the technical field of harmonic analysis and control and comprise the following steps: collecting current parameters in a power grid, and decomposing the collected harmonic current parameters; evaluating the current distortion degree through a current distortion index model; constructing a harmonic source coupler based on the current distortion index, and inhibiting current distortion; introducing an adjustment function adjustment parameter suppresses current distortion. According to the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the current distortion index model is built, the distortion degree of current is estimated more accurately, the harmonic source coupling coefficient model is built, parameters can be dynamically adjusted according to real-time power grid conditions, harmonic suppression is achieved, the stability and efficiency of a power grid are improved by effectively suppressing current distortion, the risk of electric energy loss and equipment damage is reduced, and the method has better effects in the aspects of improving the stability of the power grid and evaluating the accuracy and efficiency of the distortion degree of current.
Description
Technical Field
The invention relates to the technical field of harmonic analysis and control, in particular to a method and a system for suppressing current distortion of an energy-saving electrical appliance based on harmonic source coupling.
Background
With the widespread use of modern industrial and household appliances, nonlinear loads in power systems are increasing, leading to increasingly severe harmonic problems in the power grid. Harmonics can have many adverse effects on the power system, such as equipment overheating, insulation aging, increased power losses, reduced grid efficiency, and the like. Accordingly, the importance of harmonic analysis and control in the field of electrical engineering is increasingly recognized. The traditional harmonic analysis method is mainly based on frequency domain analysis, and a time domain signal is converted into a frequency domain through Fourier transformation, so that harmonic components under each frequency are obtained. The harmonic control technology comprises methods such as passive filtering, active filtering, mixed filtering and the like, and aims to reduce or eliminate bad harmonic influence and ensure stable and efficient operation of the power system.
Although existing harmonic analysis and control techniques have greatly improved the stability and efficiency of power systems, there are some drawbacks. First, conventional frequency domain analysis methods may not be accurate enough to handle rapidly changing or momentarily perturbed currents. This is because the fourier transform is based on a steady state signal, and the analysis results may be subject to errors for non-steady state or transient signals. Furthermore, conventional passive filter designs are often based on fixed operating conditions, the performance of which may be affected when the grid conditions change.
Second, active filtering techniques, while effective in compensating for harmonics, are costly and require complex control strategies. Furthermore, the introduction of active filters may cause system stability problems, especially in large power systems. Hybrid filtering combines the advantages of passive filtering and active filtering, but is more complex to design and control, requiring a higher level of skill.
Finally, while the prior art has solved the harmonic problem to a great extent, new challenges and problems continue to arise as the complexity and scale of power systems continue to increase. For example, distributed generation, access to renewable energy sources, popularization of electric vehicles, and the like all bring new harmonic sources to the power system, which makes harmonic analysis and control more complex. Accordingly, there is a continuing need to research and develop new techniques and methods to address these new challenges.
Disclosure of Invention
The present invention has been made in view of the above-described problems.
Therefore, the technical problems solved by the invention are as follows: the existing harmonic analysis and control method has the problems of low accuracy of current distortion evaluation, incapability of dynamic adjustment, low efficiency and incapability of improving the stability of a power grid.
In order to solve the technical problems, the invention provides the following technical scheme: a method and a system for suppressing current distortion of an energy-saving electrical appliance based on harmonic source coupling comprise the following steps: collecting current parameters in a power grid, and decomposing the collected harmonic current parameters; evaluating the current distortion degree through a current distortion index model; constructing a harmonic source coupler based on the current distortion index, and inhibiting current distortion; introducing an adjustment function adjustment parameter suppresses current distortion.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the decomposing of the collected harmonic current parameters comprises collecting current parameters in a power grid, monitoring the current in the power grid in real time, obtaining real-time data of the current, decomposing the load current, and defining a power component by a decomposed current component to be expressed as
i μ ＝i μ|| +i μ⊥
Wherein i is μ|| I is the current component in phase with the voltage μ⊥ I is the current component perpendicular to the voltage phase μ Is a current;
i μ|| the scale components are expressed as:
i μ|| ＝G μ u μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
G μ for the equivalent conductance of each phase, expressed as:
wherein P is μ Active power of U phase, U μ0 The square root of the voltage at the line-virtual neutral point of the u-phase.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the analysis of the parameters of the acquired harmonic current comprises a comparative example component i μ|| Decomposition, expressed as:
i μ|| ＝i μ∣s +i μ||v
wherein i is μ∣s I is a symmetrical proportional component μ||v Is an asymmetric proportional current component;
wherein i is μ∣s Defined as active current expressed as:
i μ∣s ＝i μp ＝Gu μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
the total current of the u phase is expressed as:
i μ ＝i μp +i μ||v +i μ⊥
wherein i is μ⊥ As orthogonal component, i μ||v Is an asymmetric component;
the current components are mutually orthogonal, and the lumped current of the three-phase load is as follows:
wherein I is Σ/u For total unbalanced non-active current, I Σ⊥ For total orthogonal non-active powerFlow, I Σp For the total active current, I Σq For total non-active current, I Σ Is the total current.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the estimating the current distortion degree through the current distortion index model comprises constructing a current distortion index model, quantifying the distortion degree of the current, and the current distortion index model is expressed as:
wherein D is a current distortion index, i μn The current component of the nth harmonic wave, N is the considered harmonic wave number;
when D is less than or equal to 0.1, the power grid has no current distortion, and the current state is continuously monitored;
when D is more than 0.1 and less than or equal to 0.5, current distortion exists in the power grid, and an adjusting function is introduced to inhibit;
and when D is more than 0.5, carrying out overall maintenance, replacement and upgrading on the power grid equipment system.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the constructing a harmonic source coupling coefficient model based on the current distortion index includes defining a harmonic source coupling coefficient to represent an efficiency of the harmonic source coupler at time t, expressed as:
where D (K) is the current distortion index at a given Kc, β is the attenuation coefficient, and T is the time range.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the introducing the tuning function tuning parameter to suppress current distortion includes constructing a tuning function representing an amount of tuning of the harmonic source coupler at time t, expressed as:
A(t)＝K c (t)×[1-γ×sin(ωt+φ)]
where γ is an adjustment coefficient, ω is the adjusted frequency, and φ is the phase offset.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the invention comprises the following steps: the step of introducing the adjustment function adjustment parameters to restrain the current distortion comprises the step of adjusting the coupler according to the output quantity of the adjustment function;
when A (t) is more than or equal to 0.7, the coupler is not adjusted;
when A (t) <0.7, the coupler adjusts the harmonic wave by adjusting the inductance value and the capacitance value of the filter, and the resonant frequency of the filter is inversely related to the inductance value and positively related to the capacitance value;
the filter sets maximum and minimum values of the inductance value and the capacitance value, and ensures the safe operation of equipment.
The invention further aims to provide an energy-saving electrical appliance current distortion suppression system based on harmonic source coupling, which can evaluate the distortion degree of current more accurately through a current distortion index model, effectively suppress current distortion and improve the stability and efficiency of a power grid.
As a preferable scheme of the energy-saving electrical appliance current distortion suppression system based on harmonic source coupling, the invention comprises the following steps: the system comprises an initialization module, a load current decomposition module, a current distortion evaluation module and a current distortion suppression module; the initialization module is used for monitoring the current in the power grid in real time and acquiring real-time current data; the load current decomposition module is used for mutually orthogonalizing current components and outputting lumped current of the three-phase load; the current distortion evaluation module is used for evaluating the distortion degree of the current through a current distortion index model; the current distortion suppression module is used for introducing an adjusting function through the harmonic source coupler to suppress current distortion.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that execution of the computer program by the processor is the step of implementing a method for energy efficient appliance current distortion suppression based on harmonic source coupling.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a method for energy efficient appliance current distortion suppression based on harmonic source coupling.
The invention has the beneficial effects that: according to the energy-saving electrical appliance current distortion suppression method based on harmonic source coupling, the current distortion index model is built, the distortion degree of current is estimated more accurately, the harmonic source coupling coefficient model is built, parameters can be dynamically adjusted according to real-time power grid conditions, harmonic suppression is achieved, the stability and efficiency of a power grid are improved by effectively suppressing current distortion, the risk of electric energy loss and equipment damage is reduced, and the method has better effects in the aspects of improving the stability of the power grid and evaluating the accuracy and efficiency of the distortion degree of current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall flowchart of a method for suppressing current distortion of an energy-saving electrical appliance based on harmonic source coupling according to a first embodiment of the present invention.
Fig. 2 is a three-phase current waveform of a traction substation of a mountain customs electrified railway at a certain moment based on a harmonic source coupling energy-saving electric appliance current distortion suppression method according to a first embodiment of the present invention.
Fig. 3 is a three-phase current waveform of a charging pile of a certain electric vehicle at a certain moment of the system based on a harmonic source coupling energy-saving electric appliance current distortion suppression method according to a first embodiment of the present invention.
Fig. 4 is a power supply side current simulation waveform of three energy-saving appliances based on the harmonic source coupling energy-saving appliance current distortion suppression method according to the first embodiment of the present invention.
Fig. 5 is a power supply side current harmonic analysis of three energy-saving appliances based on a harmonic source coupling energy-saving appliance current distortion suppression method according to a first embodiment of the present invention
Fig. 6 is an overall flowchart of an energy-saving electrical appliance current distortion suppression system based on harmonic source coupling according to a third embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Referring to fig. 1-5, in one embodiment of the present invention, a method and a system for suppressing current distortion of an energy-saving electrical appliance based on harmonic source coupling are provided, including:
s1: and collecting current parameters in the power grid, and decomposing the collected harmonic current parameters.
Further, the current in the power grid is monitored in real time, and real-time data of the current are obtained.
It should be noted that the installation of the current sensor on the critical node ensures that all waveforms and distortions of the current can be captured.
It should also be noted that the use of a high-speed data acquisition device ensures that current data can be captured in real time, especially during periods of high load or rapid changes. Preliminary analysis is carried out on the acquired data to identify possible harmonic sources and distortion modes
Further, the load current is decomposed, and the decomposed current component defines a power component expressed as
i μ ＝i μ|| +i μ⊥
Wherein i is μ|| I is the current component in phase with the voltage μ⊥ I is the current component perpendicular to the voltage phase μ Is a current;
i μ|| the scale components are expressed as:
i μ|| ＝G μ u μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
G μ for the equivalent conductance of each phase, expressed as:
wherein P is μ Active power of U phase, U μ0 The square root of the voltage at the line-virtual neutral point of the u-phase.
It should be noted that the comparative example component i μ|| Decomposition, expressed as:
i μ|| ＝i μ∣s +i μ||v
wherein i is μ∣s I is a symmetrical proportional component μ||v Is an asymmetric proportional current component;
wherein i is μ∣s Defined as active current expressed as:
i μ∣s ＝i μp ＝Gu μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
the total current of the u phase is expressed as:
i μ ＝i μp +i μ||v +i μ⊥
wherein i is μ⊥ As orthogonal component, i μ||v Is an asymmetric component;
the current components are mutually orthogonal, and the lumped current of the three-phase load is as follows:
wherein I is Σ/u For total unbalanced non-active current, I Σ⊥ For total orthogonal non-active current, I Σp For the total active current, I Σq For total non-active current, I Σ Is the total current.
It should also be noted that the collected current data is filtered and denoised to ensure the accuracy of the analysis.
Further, the calculated current distortion index is stored in a database for subsequent analysis and comparison.
S2: the degree of current distortion is evaluated by a current distortion index model.
Further, a current distortion index model is constructed, the distortion degree of the current is quantized, and the current distortion index model is expressed as:
wherein D is a current distortion index, i μn The current component of the nth harmonic wave, N is the considered harmonic wave number;
when D is less than or equal to 0.1, the power grid has no current distortion, and the current state is continuously monitored;
when D is more than 0.1 and less than or equal to 0.5, current distortion exists in the power grid, and an adjusting function is introduced to inhibit;
and when D is more than 0.5, carrying out overall maintenance, replacement and upgrading on the power grid equipment system.
It should be noted that the main harmonic source is identified by the harmonic analysis tool, and the time of current distortion is compared with the operation record of the equipment to find out the operation or event possibly causing distortion.
It should also be noted that data format conversion converts the raw data collected into a format suitable for analysis. The current data is sampled at high frequency to ensure that short-term harmonic distortion is captured. And (3) carrying out distortion index algorithm optimization, optimizing a calculation method of the current distortion index according to the characteristics of the power grid, and improving the calculation speed and accuracy. The trend and pattern of current distortion are identified as compared to historical data.
Further, the cause analysis of the current distortion is performed, the working state of the equipment is monitored, the working state of the equipment in the power grid is monitored, such as the switching state, the load size and the like, and the equipment possibly causing the distortion is found out. The harmonic source positioning technology is applied to quickly and accurately find out the main harmonic source. External interference analysis, such as large equipment nearby, electromagnetic interference, and the like. The historical operating records of the device are queried to find events or operations that may be related to current distortion.
S3: and constructing a harmonic source coupler based on the current distortion index to inhibit current distortion.
Furthermore, according to the severity of the current distortion and the characteristics of the harmonic source, the requirements of the harmonic source coupler are determined, appropriate parameters such as coupling coefficient, impedance and the like are selected, the effect of the coupler is ensured, the effect of the coupler is tested in a simulation environment, and the effect of the coupler is ensured to be capable of effectively inhibiting the current distortion.
It should be noted that a harmonic source coupling coefficient K is defined c (t) the coefficient representing the efficiency of the harmonic source coupler at time t. Our goal is to find an optimal K c (t) minimizing D, expressed as:
where D (K) is the current distortion index at a given Kc, β is the attenuation coefficient, and T is the time range.
It should also be noted that the principle of harmonic source coupling is studied to ensure the scientificity of coupler design. And a power grid model is built on a computer, the work of the coupler is simulated, and design parameters are optimized. Prototype manufacturing and testing are carried out, a harmonic source coupler prototype is manufactured, and field testing is carried out, so that the effect is verified. A feedback mechanism is established, and the design of the coupler is continuously optimized according to the actual working effect.
S4: introducing an adjustment function adjustment parameter suppresses current distortion.
Further, an adjustment function is built, which represents the adjustment amount of the harmonic source coupler at time t, and is expressed as:
A(t)＝K c (t)×[1-γ×sin(ωt+φ)]
where γ is an adjustment coefficient, ω is the adjusted frequency, and φ is the phase offset.
It should be noted that, according to the output quantity of the adjusting function, the coupler is adjusted;
when A (t) is more than or equal to 0.7, the coupler is not adjusted;
when A (t) <0.7, the coupler adjusts the harmonic wave by adjusting the inductance value and the capacitance value of the filter, and the resonant frequency of the filter is inversely related to the inductance value and positively related to the capacitance value;
reducing the resonant frequency of the filter to suppress harmonics of lower frequencies, the system increasing the inductance value or decreasing the capacitance value;
the resonance frequency of the filter is improved to inhibit the harmonic wave of higher frequency, and the inductance value is reduced or the capacitance value is increased by the system;
the filter sets maximum and minimum values of the inductance value and the capacitance value, and ensures the safe operation of equipment.
It should also be noted that the real-time data access ensures that the coupler can receive current data in real time so as to perform real-time adjustment, dynamically adjusts parameters of the coupler according to a real-time current distortion index, monitors stability of the power grid in real time in the adjustment process, ensures that the power grid is not unstable due to adjustment, collects the adjusted current data, and analyzes the effect of the coupler so as to further optimize.
Example 2
In order to verify the beneficial effects of the invention, the invention carries out scientific demonstration through economic benefit calculation and simulation experiments.
Firstly, aiming at the implementation experiment, a current distortion simulator is used for simulating current distortion, the harmonic source coupler and the harmonic suppression device in the prior art are respectively used for harmonic suppression, a current sensor and a data acquisition device are used for recording experimental results, and effects of the two technologies are analyzed and compared.
The current distortion index is an index for measuring the difference between a current waveform and an ideal sine waveform. The lower the index, the closer the current waveform to an ideal sinusoidal waveform, i.e., the less current distortion. The harmonic suppression efficiency is the efficiency of the harmonic suppression device in reducing current distortion. The higher suppression efficiency means that the device is able to effectively reduce most of the current distortion. The grid frequency offset is such that the frequency of the grid is typically a fixed 50Hz. Frequency offset is a key indicator of grid stability, and smaller offsets indicate that the grid is more stable. The power loss means a power loss due to current distortion. Current distortion can lead to reduced device efficiency and increased power loss. The lower the electric energy loss value is, the higher the system efficiency is, and the energy saving effect is good. The speed of adjusting the harmonic source coupling coefficient represents the speed of adjusting the parameter of the harmonic source coupler according to the real-time power grid condition. The fast adjustment speed means that the system can adapt to changes quickly, thus suppressing current distortion more effectively. The experimental results are shown in table 1:
table 1 comparison of experimental results
From the table, the invention is superior to the prior art in the aspects of current distortion index, harmonic suppression efficiency, power grid frequency offset, electric energy loss, equipment damage risk, harmonic source coupling coefficient adjustment speed and the like, and fully embodies the advantages of the invention.
Example 3
Referring to fig. 6, for one embodiment of the present invention, there is provided an energy-saving appliance current distortion suppression system based on harmonic source coupling, including: initialization module, load current decomposition module, current distortion evaluation module, and current distortion suppression module
The system comprises an initialization module, a load current decomposition module, a current distortion evaluation module and a current distortion suppression module, wherein the initialization module is used for monitoring current in a power grid in real time and acquiring real-time current data, the load current decomposition module is used for mutually orthogonalizing current components and outputting lumped current of a three-phase load, the current distortion evaluation module is used for evaluating the distortion degree of the current through a current distortion index model, and the current distortion suppression module is used for introducing an adjustment function through a harmonic source coupler and suppressing current distortion.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like. It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. The energy-saving electrical appliance current distortion suppression method based on harmonic source coupling is characterized by comprising the following steps of:
collecting current parameters in a power grid, and decomposing the collected harmonic current parameters;
evaluating the current distortion degree through a current distortion index model;
constructing a harmonic source coupler based on the current distortion index, and inhibiting current distortion;
introducing an adjustment function adjustment parameter suppresses current distortion.
2. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the decomposing of the collected harmonic current parameters comprises collecting current parameters in a power grid, monitoring the current in the power grid in real time, obtaining real-time data of the current, decomposing the load current, and defining a power component by a decomposed current component to be expressed as
i μ ＝i μ|| +i μ⊥
Wherein i is μ|| I is the current component in phase with the voltage μ⊥ I is the current component perpendicular to the voltage phase μ Is a current;
i μ|| the scale components are expressed as:
i μ|| ＝G μ u μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
G μ for the equivalent conductance of each phase, expressed as:
wherein P is μ Active power of U phase, U μ0 The square root of the voltage at the line-virtual neutral point of the u-phase.
3. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the analysis of the parameters of the acquired harmonic current comprises a comparative example component i μ|| Decomposition, expressed as:
i μ|| ＝i μ∣s +i μ||v
wherein i is μ∣s I is a symmetrical proportional component μ||v Is an asymmetric proportional current component;
wherein i is μ∣s Defined as active current expressed as:
i μ∣s ＝i μp ＝Gu μ0
wherein G is μ For equivalent conductance of each phase, u μ0 Voltages for the corresponding line-virtual neutral points;
the total current of the u phase is expressed as:
i μ ＝i μp +i μ||v +i μ⊥
wherein i is μ⊥ As orthogonal component, i μ||v Is an asymmetric component;
the current components are mutually orthogonal, and the lumped current of the three-phase load is as follows:
wherein I is Σ/u For total unbalanced non-active current, I Σ⊥ For total orthogonal non-active current, I Σp For the total active current, I Σq For total non-active current, I Σ Is the total current.
4. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the estimating the current distortion degree through the current distortion index model comprises constructing a current distortion index model, quantifying the distortion degree of the current, and the current distortion index model is expressed as:
wherein D is a current distortion index, i μn The current component of the nth harmonic wave, N is the considered harmonic wave number;
when D is less than or equal to 0.1, the power grid has no current distortion, and the current state is continuously monitored;
when D is more than 0.1 and less than or equal to 0.5, current distortion exists in the power grid, and an adjusting function is introduced to inhibit;
and when D is more than 0.5, carrying out overall maintenance, replacement and upgrading on the power grid equipment system.
5. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the constructing a harmonic source coupling coefficient model based on the current distortion index includes defining a harmonic source coupling coefficient to represent an efficiency of the harmonic source coupler at time t, expressed as:
where D (K) is the current distortion index at a given Kc, β is the attenuation coefficient, and T is the time range.
6. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the introducing the tuning function tuning parameter to suppress current distortion includes constructing a tuning function representing an amount of tuning of the harmonic source coupler at time t, expressed as:
A(t)＝K c (t)×[1-γ×sin(ωt+φ)]
where γ is an adjustment coefficient, ω is the adjusted frequency, and φ is the phase offset.
7. The energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in claim 1, wherein the method comprises the following steps: the step of introducing the adjustment function adjustment parameters to restrain the current distortion comprises the step of adjusting the coupler according to the output quantity of the adjustment function;
when A (t) is more than or equal to 0.7, the coupler is not adjusted;
when A (t) <0.7, the coupler adjusts the harmonic wave by adjusting the inductance value and the capacitance value of the filter, and the resonant frequency of the filter is inversely related to the inductance value and positively related to the capacitance value;
the filter sets maximum and minimum values of the inductance value and the capacitance value, and ensures the safe operation of equipment.
8. A system employing the energy-saving appliance current distortion suppression method based on harmonic source coupling as claimed in any one of claims 1 to 7, characterized in that: the system comprises an initialization module, a load current decomposition module, a current distortion evaluation module and a current distortion suppression module;
the initialization module is used for monitoring the current in the power grid in real time and acquiring real-time current data;
the load current decomposition module is used for mutually orthogonalizing current components and outputting lumped current of the three-phase load;
the current distortion evaluation module is used for evaluating the distortion degree of the current through a current distortion index model;
the current distortion suppression module is used for introducing an adjusting function through the harmonic source coupler to suppress current distortion.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of a harmonic source coupling based energy efficient appliance current distortion suppression method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of a harmonic source coupling based energy efficient appliance current distortion suppression method as claimed in any one of claims 1 to 7.
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