CN115800714B - Inverter control automatic overcurrent protection method - Google Patents
Inverter control automatic overcurrent protection method Download PDFInfo
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- CN115800714B CN115800714B CN202211693700.4A CN202211693700A CN115800714B CN 115800714 B CN115800714 B CN 115800714B CN 202211693700 A CN202211693700 A CN 202211693700A CN 115800714 B CN115800714 B CN 115800714B
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Abstract
The application relates to an inverter control automatic overcurrent protection method, which comprises the steps of calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a power grid voltage positive sequence component and a negative sequence component under an unbalanced power grid static two-phase coordinate system, and counting the actual expected value of active power of the power grid and the actual expected value of reactive power of the power grid; calculating a comprehensive condition reference value of the power, modifying the weight of the comprehensive condition reference value of the power through iterative statistics in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power; the application is realized by a 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, compared with an algorithm similar to a sliding index average in the prior art, the coefficient x is adjusted, the control is more accurate, and the integral characteristic in the adjustment can be more embodied in accurate control under the comprehensive influence of historical data.
Description
Technical Field
The application relates to an inverter control automatic overcurrent protection method.
Background
There are many techniques for controlling over-current protection of an inverter in the related art, in which: patent document CN109462326B discloses a technique for controlling over-current protection of an inverter, which is characterized in that power fluctuation is adjusted by adjusting a reference value of active power and a reference value of reactive power to realize power adjustment, but in specific implementation, an algorithm similar to sliding index average is adopted in calculation of the reference value of active power and the reference value of reactive power to adjust the coefficient x, and the algorithm has a certain effect, but the adjustment accuracy is very low.
Disclosure of Invention
In order to overcome the defects existing in the prior art, the application provides an inverter control automatic overcurrent protection method.
The technical scheme adopted for solving the technical problems is as follows:
the inverter control automatic overcurrent protection method comprises the steps of calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a power grid voltage positive sequence component and a negative sequence component under an unbalanced power grid static two-phase coordinate system, and counting an actual expected value of active power of the power grid and an actual expected value of reactive power of the power grid; and calculating the comprehensive condition reference value of the power, modifying the weight of the comprehensive condition reference value of the power through iterative statistics in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power.
Further, the inverter control automatic overcurrent protection method calculates a comprehensive condition reference value M of the power as follows:
M=P 1 ·dt+P 2 ·/> dt
wherein N is 1 =E 1 2 +E 2 2 ,N 2 =E 2 2 -E 1 2， Wherein a is 1 ，a 2 To adjust the coefficient E 1 E is the actual expected value of the active power 2 For the actual expected value of reactive power, P 1 ,P 2 Is weight, t 1 ，t 2 For reference point in time, y 1 ，y 2 The positive sequence component and the negative sequence component are two vector products.
Further, in the inverter control automatic overcurrent protection method, the voltage components in the grid voltage positive sequence component and the grid voltage negative sequence component are calculated through the grid fundamental frequency period and the grid unbalanced static two-phase coordinate system.
Further, the inverter control automatic overcurrent protection method reduces the comprehensive condition reference value of the power into an active power parameter and a reactive power parameter, and substitutes the active power parameter and the reactive power parameter into a model predictive power control objective function to control the power periodically.
Further, the inverter control automatic overcurrent protection method reduces the comprehensive condition reference value of the power to active power parameters and reactive power parameters, specifically, a group of P is initially set up 1 ,P 2 Value, let M 1 =，M 2 =/>Wherein P is 1 ,P 2 ,t 1 ，t 2 M is a known condition, P 1 ,P 2 Is weight, t 1 ，t 2 For reference time points, give M 1 Or M 2 Any one of the preferred values, i.e. calculate M 1 And M is as follows 2 Wherein M is 1 As active power parameter, M 2 Is a reactive power parameter.
Further, the inverter control automatic overcurrent protection system comprises a voltage peak value calculation unit, a voltage peak value calculation unit and a voltage peak value calculation unit, wherein the voltage peak value calculation unit is used for calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value; the vector value calculation unit is used for calculating a positive sequence component and a negative sequence component of the power grid voltage under the unbalanced power grid static two-phase coordinate system; the statistics unit is used for counting the actual expected value of the active power of the power grid and the actual expected value of the reactive power of the power grid; the comprehensive condition reference value calculation unit is used for calculating the comprehensive condition reference value of the power, and modifying the weight of the comprehensive condition reference value of the power through iterative statistics in calculation; and the power control unit is used for adjusting the comprehensive condition reference value of the power and controlling the power.
Advantageous effects
The application is realized by a 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, and compared with the algorithm similar to the sliding index average in the prior art for adjusting the coefficient x, the method has the advantages that the control is more accurate, and the integral characteristic in the adjustment of the method can be more embodied in the accurate control under the comprehensive influence of historical data.
Drawings
Fig. 1 is a flowchart of an inverter control automatic overcurrent protection method.
Detailed Description
In specific implementation, the application discloses an inverter control automatic overcurrent protection method, as shown in fig. 1, which comprises the following steps: calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a power grid voltage positive sequence component and a negative sequence component under an unbalanced power grid static two-phase coordinate system, and counting an actual expected value of active power of the power grid and an actual expected value of reactive power of the power grid; and calculating the comprehensive condition reference value of the power, modifying the weight of the comprehensive condition reference value of the power through iterative statistics in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power.
In a preferred implementation, the integrated condition reference value M of the power is calculated as follows:
M=P 1 ·dt+P 2 ·/>dt
wherein N is 1 =E 1 2 +E 2 2 ,N 2 =E 2 2 -E 1 2， Wherein a is 1 ，a 2 To adjust the coefficient E 1 E is the actual expected value of the active power 2 For the actual expected value of reactive power, P 1 ,P 2 Is weight, t 1 ，t 2 For reference point in time, y 1 ，y 2 The positive sequence component and the negative sequence component are two vector products.
In a preferred embodiment, the positive and negative sequence components of the grid voltage are calculated from the grid fundamental frequency period and the voltage components in the grid unbalanced stationary two-phase coordinate system.
In a preferred implementation, the integrated condition reference value of the power is further reduced to an active power parameter and a reactive power parameter and substituted into the model predictive power control objective function to control the power periodically. The method for reducing the comprehensive condition reference value of the power into the active power parameter and the reactive power parameter comprises the following steps of initially setting a group of P 1 ,P 2 Value, let M 1 =，M 2 =/>Wherein P is 1 ,P 2 ,t 1 ，t 2 M is a known condition, P 1 ,P 2 Is weight, t 1 ，t 2 For reference time points, give M 1 Or M 2 Any one of the preferred values, i.e. calculate M 1 And M is as follows 2 Wherein M is 1 As active power parameter, M 2 Is a reactive power parameter.
The application also discloses an inverter control automatic overcurrent protection system, which comprises a voltage peak value calculation unit, a voltage peak value calculation unit and a voltage peak value calculation unit, wherein the voltage peak value calculation unit is used for calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value; the vector value calculation unit is used for calculating a positive sequence component and a negative sequence component of the power grid voltage under the unbalanced power grid static two-phase coordinate system; the statistics unit is used for counting the actual expected value of the active power of the power grid and the actual expected value of the reactive power of the power grid; the comprehensive condition reference value calculation unit is used for calculating the comprehensive condition reference value of the power, and modifying the weight of the comprehensive condition reference value of the power through iterative statistics in calculation; and the power control unit is used for adjusting the comprehensive condition reference value of the power and controlling the power.
In one specific implementation, the application discloses an inverter control automatic overcurrent protection method, which comprises the following steps: calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a power grid voltage positive sequence component and a negative sequence component under an unbalanced power grid static two-phase coordinate system, and calculating the actual expected value of active power of the power grid and the actual expected value of reactive power of the power grid through the power grid fundamental frequency period and the voltage component calculation under the power grid unbalanced static two-phase coordinate system in the power grid voltage positive sequence component and the power grid voltage negative sequence component; calculating a comprehensive condition reference value of power, wherein the comprehensive condition reference value M of the power is calculated as follows:
M=P 1 ·dt+P 2 ·/>dt
wherein N is 1 =E 1 2 +E 2 2 ,N 2 =E 2 2 -E 1 2， Wherein a is 1 ，a 2 To adjust the coefficient E 1 E is the actual expected value of the active power 2 For the actual expected value of reactive power, P 1 ,P 2 Is weight, t 1 ，t 2 For reference point in time, y 1 ，y 2 For positive sequence component and negative sequence component, two vector products are used, the weight of the comprehensive condition reference value of the power is modified through iterative statistics in calculation, and the comprehensive condition reference value of the power is restored to active power parameter and reactive power parameter, specifically, a group of P is initially set up 1 ,P 2 Value, let M 1 =，M 2 =/>Wherein P is 1 ,P 2 ,t 1 ，t 2 M is a known condition, P 1 ,P 2 Is weight, t 1 ，t 2 For reference time points, give M 1 Or M 2 Any one of the preferred values, i.e. calculate M 1 And M is as follows 2 Wherein M is 1 As active power parameter, M 2 Is a reactive power parameter, and then adjusts the comprehensive condition reference value of the power and controls the power.
The application is realized by a 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, and compared with the algorithm similar to the sliding index average in the prior art for adjusting the coefficient x, the method has the advantages that the control is more accurate, and the integral characteristic in the adjustment of the method can be more embodied in the accurate control under the comprehensive influence of historical data.
Claims (5)
1. The inverter control automatic overcurrent protection method comprises the steps that a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value are calculated, a power grid voltage positive sequence component and a negative sequence component are calculated under an unbalanced power grid static two-phase coordinate system, an actual expected value of active power of a power grid is counted, and an actual expected value of reactive power of the power grid is calculated; calculating a comprehensive condition reference value of the power, modifying the weight of the comprehensive condition reference value of the power through iterative statistics in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power;
the comprehensive condition reference value M of the power is calculated as follows:
M=P 1 ·dt+P 2 ·/>dt
wherein N is 1 =E 1 2 +E 2 2 ,N 2 =E 2 2 -E 1 2， Wherein a is 1 ，a 2 To adjust the coefficient E 1 E is the actual expected value of the active power 2 For the actual expected value of reactive power, P 1 ,P 2 Is weight, t 1 ，t 2 For reference point in time, y 1 ，y 2 The positive sequence component and the negative sequence component are two vector products.
2. The method according to claim 1, wherein the voltage components in the grid voltage positive sequence component and the grid voltage negative sequence component are calculated by the grid fundamental frequency period and the grid unbalanced stationary two-phase coordinate system.
3. The inverter control automatic overcurrent protection method according to claim 1, wherein the integrated condition reference value of the power is restored to an active power parameter and a reactive power parameter and substituted into a model predictive power control objective function to control the power periodically.
4. The method of claim 3, wherein the step of reducing the integrated condition reference value of the power to the active power parameter and the reactive power parameter is performed by initially setting a group of P 1 ,P 2 Value, let M 1 =，M 2 =/>Wherein P is 1 ,P 2 ,t 1 ，t 2 M is a known condition, P 1 ,P 2 Is weight, t 1 ，t 2 For reference time points, give M 1 Or M 2 Any one of the preferred values, i.e. calculate M 1 And M is as follows 2 Wherein M is 1 As active power parameter, M 2 Is a reactive power parameter.
5. The inverter control automatic overcurrent protection system according to claim 1, comprising a voltage peak calculation unit for calculating a negative sequence grid voltage peak and a positive sequence grid voltage peak; the vector value calculation unit is used for calculating a positive sequence component and a negative sequence component of the power grid voltage under the unbalanced power grid static two-phase coordinate system; the statistics unit is used for counting the actual expected value of the active power of the power grid and the actual expected value of the reactive power of the power grid; the comprehensive condition reference value calculation unit is used for calculating the comprehensive condition reference value of the power, and modifying the weight of the comprehensive condition reference value of the power through iterative statistics in calculation; and the power control unit is used for adjusting the comprehensive condition reference value of the power and controlling the power.
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Citations (6)
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| CN103956919A (en) * | 2014-04-15 | 2014-07-30 | 中国矿业大学 | Simplified model forecasting control method of network voltage unbalance three-level rectifier |
| CN109274284A (en) * | 2018-10-18 | 2019-01-25 | 华南理工大学 | The flexible power control method of gird-connected inverter under a kind of unbalanced power grid |
| CN109462326A (en) * | 2018-10-18 | 2019-03-12 | 华南理工大学 | The overcurrent protection Poewr control method of gird-connected inverter under a kind of unbalanced power grid |
| EP3499672A1 (en) * | 2017-12-15 | 2019-06-19 | Delta Electronics (Shanghai) Co., Ltd. | Method and device for controlling distribution of unbalanced and harmonic power among parallel inverters |
| CN112821453A (en) * | 2021-01-22 | 2021-05-18 | 华北电力大学 | Power control method and device of grid-connected inverter and grid-connected inverter |
| CN114938027A (en) * | 2022-05-31 | 2022-08-23 | 燕山大学 | Fault-tolerant control method for voltage source type inverter under asymmetric fault working condition |
-
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- 2022-12-28 CN CN202211693700.4A patent/CN115800714B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956919A (en) * | 2014-04-15 | 2014-07-30 | 中国矿业大学 | Simplified model forecasting control method of network voltage unbalance three-level rectifier |
| EP3499672A1 (en) * | 2017-12-15 | 2019-06-19 | Delta Electronics (Shanghai) Co., Ltd. | Method and device for controlling distribution of unbalanced and harmonic power among parallel inverters |
| CN109274284A (en) * | 2018-10-18 | 2019-01-25 | 华南理工大学 | The flexible power control method of gird-connected inverter under a kind of unbalanced power grid |
| CN109462326A (en) * | 2018-10-18 | 2019-03-12 | 华南理工大学 | The overcurrent protection Poewr control method of gird-connected inverter under a kind of unbalanced power grid |
| CN112821453A (en) * | 2021-01-22 | 2021-05-18 | 华北电力大学 | Power control method and device of grid-connected inverter and grid-connected inverter |
| CN114938027A (en) * | 2022-05-31 | 2022-08-23 | 燕山大学 | Fault-tolerant control method for voltage source type inverter under asymmetric fault working condition |
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