CN117096938A - Inverter output power quality adaptive control method and device and computer equipment - Google Patents
Inverter output power quality adaptive control method and device and computer equipment 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides an inverter output power quality adaptive control method, an inverter output power quality adaptive control device and computer equipment, and relates to the technical field of power systems, wherein the method comprises the following steps: acquiring power grid state parameters and output load characteristic data; obtaining a power grid state monitoring result according to the power grid state parameters, and obtaining a load characteristic analysis result according to the current output load characteristic data; obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result; adjusting control parameters according to a preset self-adaptive control algorithm and an adaptive control strategy; acquiring the power quality parameter, judging an adaptive control effect according to the power quality parameter, and stopping control parameter adjustment if the adaptive control effect reaches a preset control effect; if the preset control effect is not achieved, the adaptive control strategy is adjusted, and control parameter adjustment is performed again until the preset control effect is achieved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an inverter output power quality adaptive control method, an inverter output power quality adaptive control device and computer equipment.
Background
The inverter is an electronic device, and the inverter can convert the voltage and frequency of a direct current power supply by adopting a proper circuit topology and a control method to generate alternating current matched with the voltage and frequency of an access power grid, so that the inverter has wide application in renewable energy source application, power transmission and distribution, uninterruptible power supply and household and commercial power systems.
Since inverters are often used to power nonlinear loads, such as power electronics, motors, etc., these nonlinear loads introduce harmonics and disturbances that lead to degradation of the power quality of the inverter output, and some conventional control algorithms may not be suitable for complex power quality requirements, such as accurate control of voltage, frequency, and fast response capability, etc., and also result in degradation of the inverter output power quality.
Disclosure of Invention
The invention aims to solve the problems of reducing harmonic waves and interference and improving a control algorithm so as to improve the quality of the power output by an inverter.
In order to solve the above problems, the present invention provides a method for adaptively controlling the output power quality of an inverter, comprising:
acquiring power grid state parameters and output load characteristic data, wherein the power grid state parameters comprise voltage values, current values, frequency values and harmonic contents, and the output load characteristic data comprise current harmonic components and power factors;
obtaining a power grid state monitoring result according to the power grid state parameters, and obtaining a load characteristic analysis result according to the output load characteristic data;
obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
adjusting control parameters according to a preset self-adaptive control algorithm and the adaptive control strategy;
acquiring an electric energy quality parameter, judging an adaptive control effect according to the electric energy quality parameter, and stopping control parameter adjustment if the adaptive control effect reaches a preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
Compared with the prior art: according to the invention, the power grid state and load characteristic data are acquired, the power grid state and load characteristic are judged, the power grid state monitoring result and the load characteristic analysis result are generated, the power grid and load characteristic are analyzed, the inverter output power quality adaptive control is carried out for the power grid state and the load characteristic, an adaptive control strategy is correspondingly generated for more comprehensive adjustment, the accurate control is combined with a preset adaptive control algorithm, the data calculation time is shortened, the quick response capacity is improved, finally, the power quality parameter is acquired to judge the adaptive control effect, namely whether the required effect (preset control effect) is achieved or not through adjustment, the adjusted power grid state and load characteristic can be clearly reflected through the judgment of the adaptive control effect, the poor primary adjustment effect and the repeated adjustment of power grid fluctuation are avoided, each adjustment is checked until the preset control effect is achieved, the voltage value, the current value, the frequency value, the harmonic wave and the power factor which affect the power quality of the inverter output power quality are considered respectively, the power grid and the load characteristic basic data are taken into consideration, the overall consideration, the power quality control strategy is adjusted through the adaptive control, the inverter output quality is improved, the inverter power quality is controlled with the auxiliary power quality and the power quality is stable, and the power quality can not be controlled under the same conditions, and the power quality is stable.
Optionally, the obtaining the power grid state monitoring result according to the power grid state parameter includes:
processing the voltage value, the current value, the frequency value and the harmonic content in the power grid state parameter respectively,
judging whether the voltage value exceeds a preset voltage standard range, if so, generating voltage negative state feedback;
judging whether the current value is larger than a rated current value, if so, generating current negative state feedback;
judging whether the frequency value exceeds a preset frequency standard range, if so, generating frequency negative state feedback;
judging whether the harmonic content is larger than a preset harmonic content threshold value, if so, generating harmonic pollution negative state feedback;
if at least one of the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state feedback exists, generating a power grid state monitoring result showing abnormal power grid state;
and if the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state do not exist, generating the power grid state monitoring result for displaying the normal power grid state.
Optionally, the obtaining a load characteristic analysis result according to the output load characteristic data includes:
processing the current harmonic component and the power factor in the output load characteristic data respectively;
when harmonic current exists in the current harmonic component, harmonic pollution analysis feedback is generated;
when the power factor is smaller than a preset power factor threshold, performing power factor analysis feedback;
and obtaining the load characteristic analysis result according to the harmonic pollution analysis feedback and the power factor analysis feedback.
Optionally, the obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result includes:
when the power grid state monitoring result shows that the power grid state is abnormal, the adaptive control strategy is generated by combining the load characteristic analysis result;
the adaptive control strategy includes a voltage control strategy, a current control strategy, a frequency control strategy and a load characteristic control strategy,
wherein the voltage control strategy comprises voltage limiting control and reactive power control, the voltage limiting control maintaining voltage stability by adjusting output power or current; the reactive power control maintains voltage stability by adjusting the input of reactive power;
The current control strategy includes an output current control for maintaining current stability;
the frequency control strategy comprises output power control and frequency response control, wherein the output power control is used for maintaining the stability of a power grid; the frequency response control is used for maintaining the stability of the frequency of the power grid by adjusting the output power;
the load characteristic control strategy includes power factor control and harmonic control, the power factor control improving a power factor by adjusting reactive power; the harmonic control is used for maintaining the stability of the power grid and the load by filtering the output current.
Optionally, the adaptive control algorithm includes:
，
in the method, in the process of the invention,indicate->Secondarily generated deviation parameter ∈ ->Representation ofProportional coefficient (F)>The time constant is represented by a time constant,represents the sampling time, +.>Indicate->Deviation between the sampling result of the sub-controlled object and the set value, < +.>Indicate->And the secondary controlled object samples the deviation between the result and the set value.
Optionally, the adjusting the control parameter according to a preset adaptive control algorithm and the adaptive control strategy includes:
respectively carrying out control parameter adjustment on the voltage value, the current value, the frequency value and the harmonic content through the adaptive control strategy, carrying out deviation parameter adjustment on the adjusted voltage value, current value, frequency value and harmonic content through the preset adaptive control algorithm,
The voltage regulation value is obtained according to the voltage value and a preset voltage standard range, the voltage limitation control and the reactive power control are carried out according to the voltage regulation value, and the voltage value is in the preset voltage standard range by adjusting output power or current and adjusting input of reactive power;
when the current value is larger than the rated current value, controlling the output current through the output current to enable the current value to be smaller than the rated current value;
when the frequency value exceeds a preset frequency standard range, adjusting output power through the output power control and the frequency response control, and adjusting output period and frequency to enable the frequency value to be in the preset frequency standard range;
when the harmonic content is larger than a preset harmonic content threshold, reactive power is regulated and output current is filtered through the power factor control and the harmonic control, harmonic generation is restrained, and the harmonic content is smaller than or equal to the preset harmonic content threshold.
Optionally, the power quality parameter includes a voltage parameter, a harmonic content parameter and a power factor parameter, the obtaining the power quality parameter, and determining the adaptive control effect according to the power quality parameter includes:
Judging the adaptive control effect through the voltage parameter, the harmonic content parameter and the power factor parameter;
when the value and the fluctuation threshold of the voltage parameter are in the preset voltage standard range, the voltage adaptability control effect reaches the standard;
when the harmonic content parameter is smaller than the preset harmonic content threshold value, the harmonic content adaptive control effect reaches the standard;
when the power factor parameter is larger than a preset power factor threshold, the power factor adaptive control effect reaches the standard;
when the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect all reach the standards, judging that the adaptive control effect reaches the preset control effect;
and if any one of the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect does not reach the standard, judging that the adaptive control effect does not reach the preset control effect.
In order to solve the above problems, the present invention also provides an inverter output power quality adaptive control apparatus, including:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring power grid state parameters and output load characteristic data, the power grid state parameters comprise voltage values, current values, frequency values and harmonic content, and the output load characteristic data comprise current harmonic components and power factors;
The processing unit is used for obtaining a power grid state monitoring result according to the power grid state parameters and obtaining a load characteristic analysis result according to the output load characteristic data;
the processing unit is further used for obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
the processing unit is further used for adjusting control parameters according to a preset self-adaptive control algorithm and the adaptive control strategy;
the processing unit is also used for acquiring the power quality parameters, judging the adaptive control effect according to the power quality parameters, and stopping the control parameter adjustment if the adaptive control effect reaches the preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
The inverter output power quality adaptive control device and the inverter output power quality adaptive control method have the same advantages as those of the prior art, and are not described in detail herein.
In order to solve the above problems, the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements any one of the above adaptive control methods for inverter output power quality when executing the computer program.
The advantages of the computer device and the inverter output power quality adaptive control method of the invention are the same as those of the prior art, and are not repeated here.
To solve the above-mentioned problems, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the inverter output power quality adaptive control method of any one of the above-mentioned.
The computer readable storage medium of the present invention has the same advantages as the inverter output power quality adaptive control method compared with the prior art, and is not described herein.
Drawings
Fig. 1 is a flow chart of an adaptive control method for inverter output power quality in an embodiment of the invention;
fig. 2 is a schematic diagram of an internal structure of a computer device according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In order to solve the above problems, referring to fig. 1, the present invention provides an inverter output power quality adaptive control method, including:
Step 110, acquiring power grid state parameters and output load characteristic data, wherein the power grid state parameters comprise voltage values, current values, frequency values and harmonic contents, and the output load characteristic data comprise current harmonic components and power factors;
specifically, the voltage is one of the most basic parameters in the power grid, the stability of the voltage is critical to the normal operation of the power equipment, whether the voltage of the power grid is in a reasonable range or not can be judged through voltage monitoring, and if the voltage fluctuation is large or deviates from a standard range, the voltage problem can be further analyzed and measures can be taken to solve, such as adjusting the output of an inverter; the power grid frequency reflects the power supply and demand balance condition, the stability of the power grid frequency is also critical to the normal operation of the power equipment, whether the power grid frequency is in a reasonable range or not can be judged through frequency monitoring, if the power grid frequency deviates greatly, the power grid load is possibly too high or insufficient, or other power system operation problems exist, and the inverter can adjust the output power to balance the power supply and demand according to the real-time frequency change condition; the current is a direct reflection of the power transmission and load demands, the change condition of the power grid load can be judged by monitoring and analyzing the current, the overload or unbalance problem can be found timely, the inverter can adjust the output power or the current according to the real-time current change so as to cope with the change of the power grid load, for example, the current exceeds a rated value and can cause overheat or burnout of power equipment, so that the monitoring current can be found timely and solve the potential problem; harmonic components in current and voltage output by the inverter may cause harmonic pollution to a power grid and other equipment, the suppression effect of the inverter on the harmonic can be evaluated by monitoring the harmonic content, and if the harmonic content exceeds the international standard or the specified upper limit, the power grid equipment may be damaged or broken, so that the problem of harmonic pollution output by the inverter can be timely found and solved by monitoring the harmonic content.
Specifically, load characteristics of the inverter output are monitored in real time, for example, current harmonic components, power factors and the like of the load can be monitored, the parameters can be used for analyzing the influence of the load on the power quality, an adaptive control strategy to be adopted by the inverter is determined, the current harmonic components of the inverter output are usually caused by nonlinear loads, harmonic currents are generated by the nonlinear loads, the waveform distortion and harmonic pollution of a power grid are caused, and the influence of the load on the power grid harmonic can be known by monitoring the current harmonic components of the load output, and whether the load meets relevant power quality standards and limits or not; the power factor output by the inverter is an index for measuring the utilization degree of active power of the load to the power grid, the power factor refers to the ratio of actual active power to apparent power, the power factor of the inverter which is normally operated should be as close to 1 as possible so as to improve the utilization efficiency of the active power and reduce the generation of invalid power, and the contribution of the inverter to the active power of the power grid and the matching degree of the inverter to the power grid can be judged by monitoring the power factor of the load of the inverter.
Step 120, obtaining a power grid state monitoring result according to the power grid state parameter, and obtaining a load characteristic analysis result according to the output load characteristic data;
Specifically, the inverter can better know the running condition of the power grid by monitoring and analyzing the power grid state parameters in real time, and adjust the output power, the current, the reactive power and the like according to the requirement so as to meet the requirement of adaptive control. Meanwhile, the problems in the power grid are identified in time, corresponding measures can be taken to protect the safe operation of the power grid equipment, and more stable and high-quality electric energy output is provided.
Specifically, the embodiment can know the influence of the load on the power grid through real-time monitoring and analysis of the load characteristic of the inverter, and correspondingly optimize and adjust according to the monitoring result. For example, for the case where the current harmonic content is high, a harmonic filter or harmonic suppression technique may be employed to reduce harmonic pollution. For the case of lower power factor, a power factor correction device can be adopted to improve the power factor, and appropriate adjustment and optimization can be made to improve the power quality and the load use efficiency.
Step 130, obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
specifically, it can be understood that the selection of the adaptive control strategy can be based on preset rules and experience, or intelligent decision can be made by using methods such as artificial intelligence and machine learning, parameters can be set according to actual conditions and requirements, and the method is more in line with the actual conditions of using the carrier while intelligent control is performed, so that the implementation of the adaptive control strategy is more accurate.
Step 140, adjusting control parameters according to a preset adaptive control algorithm and the adaptive control strategy;
in particular, the purpose of adjusting the control parameters is to enable the inverter to adapt to the changes in the power grid and the characteristics of the load, thereby providing better power quality, and it should be noted that the specific inverter control parameter adjustment method may vary according to the type of inverter, the application requirements, the control system structure, etc., and therefore, in the specific implementation, the specific control parameter adjustment scheme design and implementation are required according to the actual situation.
Step 150, acquiring the power quality parameter, judging the adaptive control effect according to the power quality parameter, and stopping the control parameter adjustment if the adaptive control effect reaches the preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
Specifically, the power quality parameters output by the inverter, such as voltage, harmonic content, power factor, etc., are used to determine the effect of the inverter adaptive control according to the change of these parameters and the target requirement, and make corresponding adjustments and optimizations, and monitoring and evaluating the effect of the inverter adaptive control is a key step to ensure that the inverter can provide output power quality according to the preset requirement.
Specifically, the adaptive control policy refers to data obtained according to the present embodiment, and is adjusted to maintain the output power quality of the inverter stable in an actual application process, for example, in the inverter related device, and it can be understood that the adaptive control policy is a policy that performs adaptive control and adjustment according to an actual situation.
Compared with the prior art: according to the invention, the power grid state and load characteristic data are acquired, the power grid state and load characteristic are judged, the power grid state monitoring result and the load characteristic analysis result are generated, the power grid and load characteristic are analyzed, the inverter output power quality adaptive control is carried out for the power grid state and the load characteristic, an adaptive control strategy is correspondingly generated for more comprehensive adjustment, the accurate control is combined with a preset adaptive control algorithm, the data calculation time is shortened, the quick response capacity is improved, finally, the power quality parameter is acquired to judge the adaptive control effect, namely whether the required effect (preset control effect) is achieved or not through adjustment, the power grid state and the load characteristic after adjustment can be clearly reflected through the judgment of the adaptive control effect, the poor primary adjustment effect and the repeated adjustment of the power grid fluctuation are avoided, each adjustment is checked until the preset control effect is achieved, the voltage value, the current value, the frequency value, the harmonic wave and the power factor which affect the power quality of the inverter output power quality are respectively considered, the basic data in two aspects of the power grid and the load characteristic are considered, the overall consideration is carried out, the adaptive control strategy is adopted for carrying out, the adjustment is carried out, the inverter output quality is improved through the adaptive control algorithm, the inverter is assisted by the power quality is improved, the inverter quality is stable, and the power quality can be controlled under the power condition and the power quality is not stable, and the power quality is required to be stably output under the power condition and the power condition.
Optionally, the obtaining the power grid state monitoring result according to the power grid state parameter includes:
processing the voltage value, the current value, the frequency value and the harmonic content in the power grid state parameter respectively,
judging whether the voltage value exceeds a preset voltage standard range, if so, generating voltage negative state feedback;
judging whether the current value is larger than a rated current value, if so, generating current negative state feedback;
judging whether the frequency value exceeds a preset frequency standard range, if so, generating frequency negative state feedback;
judging whether the harmonic content is larger than a preset harmonic content threshold value, if so, generating harmonic pollution negative state feedback;
if at least one of the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state feedback exists, generating a power grid state monitoring result showing abnormal power grid state;
and if the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state do not exist, generating the power grid state monitoring result for displaying the normal power grid state.
Specifically, if the voltage value exceeds a preset voltage standard range, i.e., the voltage fluctuation is excessive, a voltage negative state feedback will be generated. This indicates that the grid has voltage anomaly problems, such as over-high or under-low voltage; if the current value is greater than the nominal current value, a current negative state feedback will be generated. This means that the grid is overloaded or there are other faults. The negative state feedback is also included in the grid state monitoring result; if the frequency value exceeds the preset frequency standard range, frequency negative state feedback is generated, which indicates that the power grid has the problem of frequency abnormality; if the harmonic content is greater than a preset harmonic content threshold, harmonic pollution negative state feedback is generated. This means that excessive harmonic components exist in the current and voltage output by the inverter, which may cause harmonic pollution to the grid and other devices, and that any one of these negative state feedback, if any, means that the grid state is abnormal, and generates a corresponding grid state monitoring result. The result will indicate which aspect is problematic in order to take timely action for repair; if no negative state feedback exists, the power grid state is normal, a corresponding power grid state monitoring result is generated, and the output power, current or voltage and the like of the inverter can be adjusted according to the monitoring result, so that good coordinated operation between the inverter and the power grid is maintained, and more stable and high-quality electric energy output is provided. In addition, the monitoring result can be fed back to operation and maintenance personnel or an automation system through communication between the inverter and the power grid system, so that real-time monitoring and remote maintenance are realized.
Optionally, the obtaining a load characteristic analysis result according to the output load characteristic data includes:
processing the current harmonic component and the power factor in the output load characteristic data respectively;
when harmonic current exists in the current harmonic component, harmonic pollution analysis feedback is generated;
when the power factor is smaller than a preset power factor threshold, performing power factor analysis feedback;
and obtaining the load characteristic analysis result according to the harmonic pollution analysis feedback and the power factor analysis feedback.
Specifically, the load characteristic analysis may be selectively performed on the basis of the grid condition monitoring. By analyzing the current inverter output load characteristic data, analysis results concerning the current harmonic components and the power factor can be obtained. The harmonic component of the current in the output load characteristic data is processed and analyzed, and if harmonic current exists, harmonic pollution analysis feedback is generated. This means that harmonic components exist in the current output by the inverter, which may cause harmonic pollution to the power grid and other devices; and processing and analyzing the power factor in the output load characteristic data, and generating power factor analysis feedback if the power factor is smaller than a preset power factor threshold. This means that the power factor of the inverter output load is low, which may lead to a reduction in the power quality of the grid. The embodiment can help operation staff or an automation system to identify load characteristic problems, further improve the quality of a power grid, improve the reliability of power supply, and adjust the running mode of the inverter by utilizing the analysis result of the load characteristic so as to reduce harmonic pollution or improve the power factor, thereby optimizing the output load characteristic of the inverter, being beneficial to improving the coordination between the inverter and the power grid, reducing the influence on the power grid and providing more reliable and high-quality electric energy output. In addition, the load characteristic analysis result and the power grid state monitoring result can be comprehensively analyzed, and more comprehensive information is provided for power grid operation and maintenance decision.
Optionally, the obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result includes:
when the power grid state monitoring result shows that the power grid state is abnormal, the adaptive control strategy is generated by combining the load characteristic analysis result;
the adaptive control strategy includes a voltage control strategy, a current control strategy, a frequency control strategy and a load characteristic control strategy,
wherein the voltage control strategy comprises voltage limiting control and reactive power control, the voltage limiting control maintaining voltage stability by adjusting output power or current; the reactive power control maintains voltage stability by adjusting the input of reactive power;
the current control strategy includes an output current control for maintaining current stability;
the frequency control strategy comprises output power control and frequency response control, wherein the output power control is used for maintaining the stability of a power grid; the frequency response control is used for maintaining the stability of the frequency of the power grid by adjusting the output power;
the load characteristic control strategy includes power factor control and harmonic control, the power factor control improving a power factor by adjusting reactive power; the harmonic control is used for maintaining the stability of the power grid and the load by filtering the output current.
Specifically, on the basis of information obtained according to the power grid state monitoring result and the load characteristic analysis result, an adaptive control strategy is combined to keep coordinated operation between the inverter and the power grid, wherein the adaptive control strategy comprises a voltage control strategy, a current control strategy, a frequency control strategy and a load characteristic control strategy. In combination with the operation characteristics and actual requirements of the inverter, the output power, current, voltage and the like of the inverter can be adjusted according to an adaptive control strategy so as to ensure the coordinated operation of the inverter and the power grid and further improve the quality and reliability of the electric energy, and it is noted that specific embodiments of the strategies may be different according to specific inverter models and power grid requirements. Thus, in the preparation of the adaptive control strategy, reference is made to the specifications of the inverter and to the relevant grid standards, and it is ensured that the implementation of the adaptive control strategy complies with the relevant regulations and safety requirements.
Optionally, the adaptive control algorithm includes:
，
in the method, in the process of the invention,indicate->Secondarily generated deviation parameter ∈ ->Representing the proportionality coefficient>The time constant is represented by a time constant,represents the sampling time, +.>Indicate->Deviation between the sampling result of the sub-controlled object and the set value, < +. >Indicate->And the secondary controlled object samples the deviation between the result and the set value.
Specifically, the adaptive control algorithm can automatically adjust the control parameters according to the applied system change, and based on real-time feedback information, the adaptive control algorithm can automatically learn and adjust the control parameters to realize more accurate control.
Optionally, the adjusting the control parameter according to a preset adaptive control algorithm and the adaptive control strategy includes:
respectively carrying out control parameter adjustment on the voltage value, the current value, the frequency value and the harmonic content through the adaptive control strategy, carrying out deviation parameter adjustment on the adjusted voltage value, current value, frequency value and harmonic content through the preset adaptive control algorithm,
the voltage regulation value is obtained according to the voltage value and a preset voltage standard range, the voltage limitation control and the reactive power control are carried out according to the voltage regulation value, and the voltage value is in the preset voltage standard range by adjusting output power or current and adjusting input of reactive power;
when the current value is larger than the rated current value, controlling the output current through the output current to enable the current value to be smaller than the rated current value;
When the frequency value exceeds a preset frequency standard range, adjusting output power through the output power control and the frequency response control, and adjusting output period and frequency to enable the frequency value to be in the preset frequency standard range;
when the harmonic content is larger than a preset harmonic content threshold, reactive power is regulated and output current is filtered through the power factor control and the harmonic control, harmonic generation is restrained, and the harmonic content is smaller than or equal to the preset harmonic content threshold.
Optionally, the power quality parameter includes a voltage parameter, a harmonic content parameter and a power factor parameter, the obtaining the power quality parameter, and determining the adaptive control effect according to the power quality parameter includes:
judging the adaptive control effect through the voltage parameter, the harmonic content parameter and the power factor parameter;
when the value and the fluctuation threshold of the voltage parameter are in the preset voltage standard range, the voltage adaptability control effect reaches the standard;
when the harmonic content parameter is smaller than the preset harmonic content threshold value, the harmonic content adaptive control effect reaches the standard;
When the power factor parameter is larger than a preset power factor threshold, the power factor adaptive control effect reaches the standard;
when the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect all reach the standards, judging that the adaptive control effect reaches the preset control effect;
and if any one of the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect does not reach the standard, judging that the adaptive control effect does not reach the preset control effect.
Specifically, the effect of the adaptive control is judged according to the voltage parameter, the harmonic content parameter and the power factor parameter. By continuously evaluating the power quality parameters and performing feedback adjustment of adaptive control, the control performance of the inverter can be improved, so that the inverter is better adapted to the change of a power grid, and stable interaction between the inverter and the power grid is ensured. According to specific conditions and requirements, the adaptive control strategy can be further optimized, and parameter adjustment is performed by combining a preset adaptive control algorithm, so that a more accurate control effect is achieved.
Corresponding to the above-mentioned method for adaptively controlling the power quality of the output power of the inverter, the embodiment of the invention further provides a device for adaptively controlling the power quality of the output power of the inverter, which comprises:
The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring power grid state parameters and output load characteristic data, the power grid state parameters comprise voltage values, current values, frequency values and harmonic content, and the output load characteristic data comprise current harmonic components and power factors;
the processing unit is used for obtaining a power grid state monitoring result according to the power grid state parameters and obtaining a load characteristic analysis result according to the output load characteristic data;
the processing unit is further used for obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
the processing unit is further used for adjusting control parameters according to a preset self-adaptive control algorithm and the adaptive control strategy;
the processing unit is also used for acquiring the power quality parameter, judging the adaptive control effect according to the power quality parameter, and stopping controlling parameter adjustment if the adaptive control effect reaches a preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
The inverter output power quality adaptive control device and the inverter output power quality adaptive control method according to the embodiment have the same advantages as those of the prior art, and are not described herein.
In one embodiment, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the inverter output power quality adaptive control method described above when executing the computer program.
It should be noted that the device may be a computer device such as a server, a mobile terminal, or the like.
FIG. 2 illustrates an internal block diagram of a computer device in one embodiment. The computer device includes a processor, a memory, a network interface, an input device, and a display screen connected by a system bus. The memory includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system, and may also store a computer program that, when executed by a processor, causes the processor to implement a multi-functional co-operating method. The internal memory may also store a computer program that, when executed by the processor, causes the processor to perform a multi-functional co-operation method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like. In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the inverter output power quality adaptive control method described above.
Those skilled in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a non-volatile computer readable storage medium, and where the program, when executed, may include processes in the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. An inverter output power quality adaptive control method, comprising:
acquiring power grid state parameters and output load characteristic data, wherein the power grid state parameters comprise voltage values, current values, frequency values and harmonic contents, and the output load characteristic data comprise current harmonic components and power factors;
obtaining a power grid state monitoring result according to the power grid state parameters, and obtaining a load characteristic analysis result according to the output load characteristic data;
obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
adjusting control parameters according to a preset self-adaptive control algorithm and the adaptive control strategy;
acquiring an electric energy quality parameter, judging an adaptive control effect according to the electric energy quality parameter, and stopping control parameter adjustment if the adaptive control effect reaches a preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
2. The method for adaptively controlling the output power quality of an inverter according to claim 1, wherein the step of obtaining a power grid state monitoring result according to the power grid state parameter comprises the steps of:
processing the voltage value, the current value, the frequency value and the harmonic content in the power grid state parameter respectively,
judging whether the voltage value exceeds a preset voltage standard range, if so, generating voltage negative state feedback;
judging whether the current value is larger than a rated current value, if so, generating current negative state feedback;
judging whether the frequency value exceeds a preset frequency standard range, if so, generating frequency negative state feedback;
judging whether the harmonic content is larger than a preset harmonic content threshold value, if so, generating harmonic pollution negative state feedback;
if at least one of the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state feedback exists, generating a power grid state monitoring result showing abnormal power grid state;
and if the voltage negative state feedback, the current negative state feedback, the frequency negative state feedback and the harmonic pollution negative state do not exist, generating the power grid state monitoring result for displaying the normal power grid state.
3. The inverter output power quality adaptive control method according to claim 1, wherein the obtaining a load characteristic analysis result from the output load characteristic data includes:
processing the current harmonic component and the power factor in the output load characteristic data respectively;
when harmonic current exists in the current harmonic component, harmonic pollution analysis feedback is generated;
when the power factor is smaller than a preset power factor threshold, performing power factor analysis feedback;
and obtaining the load characteristic analysis result according to the harmonic pollution analysis feedback and the power factor analysis feedback.
4. A method of adaptively controlling the output power quality of an inverter according to any one of claims 1 to 3, wherein said deriving an adaptive control strategy based on said grid condition monitoring result and said load characteristic analysis result comprises:
when the power grid state monitoring result shows that the power grid state is abnormal, the adaptive control strategy is generated by combining the load characteristic analysis result;
the adaptive control strategy includes a voltage control strategy, a current control strategy, a frequency control strategy and a load characteristic control strategy,
Wherein the voltage control strategy comprises voltage limiting control and reactive power control, the voltage limiting control maintaining voltage stability by adjusting output power or current; the reactive power control maintains voltage stability by adjusting the input of reactive power;
the current control strategy includes an output current control for maintaining current stability;
the frequency control strategy comprises output power control and frequency response control, wherein the output power control is used for maintaining the stability of a power grid; the frequency response control is used for maintaining the stability of the frequency of the power grid by adjusting the output power;
the load characteristic control strategy includes power factor control and harmonic control, the power factor control improving a power factor by adjusting reactive power; the harmonic control is used for maintaining the stability of the power grid and the load by filtering the output current.
5. The inverter output power quality adaptive control method of claim 4 wherein the adaptive control algorithm comprises:
，
in the method, in the process of the invention,indicate->Secondarily generated deviation parameter ∈ ->Representing the proportionality coefficient>Representing the time constant +. >Represents the sampling time, +.>Indicate->Deviation between the sampling result of the sub-controlled object and the set value, < +.>Represent the firstAnd the secondary controlled object samples the deviation between the result and the set value.
6. The adaptive control method for inverter output power quality according to claim 5, wherein said adjusting control parameters according to a preset adaptive control algorithm and said adaptive control strategy comprises:
respectively carrying out control parameter adjustment on the voltage value, the current value, the frequency value and the harmonic content through the adaptive control strategy, carrying out deviation parameter adjustment on the adjusted voltage value, current value, frequency value and harmonic content through the preset adaptive control algorithm,
the voltage regulation value is obtained according to the voltage value and a preset voltage standard range, the voltage limitation control and the reactive power control are carried out according to the voltage regulation value, and the voltage value is in the preset voltage standard range by adjusting output power or current and adjusting input of reactive power;
when the current value is larger than the rated current value, controlling the output current through the output current to enable the current value to be smaller than the rated current value;
When the frequency value exceeds a preset frequency standard range, adjusting output power through the output power control and the frequency response control, and adjusting output period and frequency to enable the frequency value to be in the preset frequency standard range;
when the harmonic content is larger than a preset harmonic content threshold, reactive power is regulated and output current is filtered through the power factor control and the harmonic control, harmonic generation is restrained, and the harmonic content is smaller than or equal to the preset harmonic content threshold.
7. The method according to claim 6, wherein the power quality parameters include a voltage parameter, a harmonic content parameter, and a power factor parameter, the obtaining the power quality parameter, and determining the adaptive control effect according to the power quality parameter includes:
judging the adaptive control effect through the voltage parameter, the harmonic content parameter and the power factor parameter;
when the value and the fluctuation threshold of the voltage parameter are in the preset voltage standard range, the voltage adaptability control effect reaches the standard;
when the harmonic content parameter is smaller than the preset harmonic content threshold value, the harmonic content adaptive control effect reaches the standard;
When the power factor parameter is larger than a preset power factor threshold, the power factor adaptive control effect reaches the standard;
when the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect all reach the standards, judging that the adaptive control effect reaches the preset control effect;
and if any one of the voltage adaptive control effect, the harmonic content adaptive control effect and the power factor adaptive control effect does not reach the standard, judging that the adaptive control effect does not reach the preset control effect.
8. An inverter output power quality adaptive control apparatus, comprising:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring power grid state parameters and output load characteristic data, the power grid state parameters comprise voltage values, current values, frequency values and harmonic content, and the output load characteristic data comprise current harmonic components and power factors;
the processing unit is used for obtaining a power grid state monitoring result according to the power grid state parameters and obtaining a load characteristic analysis result according to the output load characteristic data;
the processing unit is further used for obtaining an adaptive control strategy according to the power grid state monitoring result and the load characteristic analysis result;
The processing unit is further used for adjusting control parameters according to a preset self-adaptive control algorithm and the adaptive control strategy;
the processing unit is also used for acquiring the power quality parameters, judging the adaptive control effect according to the power quality parameters, and stopping the control parameter adjustment if the adaptive control effect reaches the preset control effect; and if the adaptive control effect does not reach the preset control effect, adjusting the adaptive control strategy, and adjusting the control parameters again until the preset control effect is reached.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the inverter output power quality adaptive control method of any one of claims 1 to 7 when the computer program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the inverter output power quality adaptation control method of any one of claims 1 to 7.
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