CN115800714A - Inverter control automatic overcurrent protection method - Google Patents
Inverter control automatic overcurrent protection method Download PDFInfo
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- CN115800714A CN115800714A CN202211693700.4A CN202211693700A CN115800714A CN 115800714 A CN115800714 A CN 115800714A CN 202211693700 A CN202211693700 A CN 202211693700A CN 115800714 A CN115800714 A CN 115800714A
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Abstract
The invention 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 positive sequence component and a negative sequence component of the power grid voltage under an unbalanced power grid static two-phase coordinate system, and counting an actual expected value of active power and an actual expected value of reactive power of the power grid; calculating a comprehensive condition reference value of the power, iteratively counting the weight of the comprehensive condition reference value of the modified power in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power; the application is provided by 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, and compared with an algorithm similar to sliding index averaging in the prior art, the method adjusts the coefficient x, is more accurate in control, and has the integral characteristic in adjustment, so that the method can be more accurately controlled under the comprehensive influence of historical data.
Description
Technical Field
The invention relates to an inverter control automatic over-current protection method.
Background
There are many techniques for controlling the overcurrent protection of the inverter in the related art, such as: patent document CN109462326B discloses a technology for controlling overcurrent 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 adjust power, but in a specific implementation, an algorithm similar to a sliding exponential average is used for calculating the reference value of active power and the reference value of reactive power to adjust a coefficient x, and the algorithm has a certain effect, but the accuracy of the adjustment is very low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an automatic overcurrent protection method for inverter control.
The technical scheme adopted by the invention 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 and an actual expected value of reactive power of a power grid; and calculating a comprehensive condition reference value of the power, iteratively counting the weight of the comprehensive condition reference value of the modified power in the calculation, adjusting the comprehensive condition reference value of the power and controlling the power.
Further, in the inverter control automatic overcurrent protection method, 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 For actual desired value of active power, E 2 For the actual desired value of reactive power, P 1 ,P 2 Is a weight value, t 1 ，t 2 To reference a point in time, y 1 ，y 2 Positive sequence components, negative sequence components are two vector products.
Further, in the inverter control automatic overcurrent protection method, the voltage component in the grid voltage positive sequence component and the grid voltage negative sequence component is calculated according to the grid fundamental frequency period and the voltage component in 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 prediction power control objective function to periodically control the power.
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, specifically, a group of P is initially set 1 ,P 2 Value, let M 1 =
，M 2 =
In which P is 1 ,P 2 ,t 1 ，t 2 M are all known conditions, P 1 ,P 2 As a weight value, t 1 ，t 2 For reference time points, M is given 1 Or M 2 Calculating M as any one of the preferred values 1 And M 2 Wherein M is 1 As an 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 control 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 static two-phase coordinate system of the unbalanced power grid; the statistical 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 calculating unit is used for calculating a comprehensive condition reference value of the power, and the weight of the comprehensive condition reference value of the power is modified through iterative statistics in the 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 provided by 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, and compared with the method for adjusting the coefficient x by using a similar sliding index average algorithm in the prior art, the method is more accurate in control, and the method has the advantage that the integration characteristic can be more accurately controlled under the comprehensive influence of historical data.
Drawings
Fig. 1 is a flow chart of a method for inverter controlled automatic overcurrent protection as disclosed in the present application.
Detailed Description
In specific implementation, the present application discloses an inverter control automatic overcurrent protection method, as shown in fig. 1, which includes the steps of: calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a positive sequence component and a negative sequence component of the power grid voltage under a static two-phase coordinate system of the unbalanced power grid, and counting an actual expected value of active power 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 conditional reference value M of 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 For actual desired value of active power, E 2 Is made withoutActual desired value of work power, P 1 ,P 2 Is a weight value, t 1 ，t 2 To reference a point in time, y 1 ，y 2 Positive sequence components, negative sequence components are two vector products.
In a preferred implementation, the grid voltage positive sequence component and the grid voltage negative sequence component are calculated through a grid fundamental frequency cycle and a voltage component under a grid unbalance static two-phase coordinate system.
In a preferred implementation, the comprehensive condition reference value of the power is further reduced into an active power parameter and a reactive power parameter and substituted into a model prediction power control objective function to periodically control the power. The comprehensive condition reference value of the power is reduced into an active power parameter and a reactive power parameter, specifically, a group of P is initially set 1 ,P 2 Value, order M 1 =
，M 2 =
In which P is 1 ,P 2 ,t 1 ，t 2 M are all known conditions, P 1 ,P 2 Is a weight value, t 1 ，t 2 For reference time points, M is given 1 Or M 2 Calculating M as any one of the preferred values 1 And M 2 Wherein M is 1 As an 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 control 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 static two-phase coordinate system of the unbalanced power grid; the statistical 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 calculating unit is used for calculating a comprehensive condition reference value of the power, and the weight of the comprehensive condition reference value of the modified power is calculated through iteration statistics in the calculation; and the power control unit is used for adjusting the comprehensive condition reference value of the power and controlling the power.
In one particular implementation, the present application discloses an inverter controlled automatic overcurrent protection method, comprising the steps of: calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a positive sequence component and a negative sequence component of the power grid voltage under an unbalanced static two-phase coordinate system of the power grid, and calculating an actual expected value of active power of the power grid and an actual expected value of reactive power of the power grid in the positive sequence component and the negative sequence component of the power grid voltage through the fundamental frequency period of the power grid and voltage component calculation under the unbalanced static two-phase coordinate system of the power grid; calculating a comprehensive condition reference value of power, wherein the comprehensive condition reference value M of 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 For actual desired value of active power, E 2 For actual desired value of reactive power, P 1 ,P 2 Is a weight value, t 1 ，t 2 To reference a point in time, y 1 ，y 2 The power parameter is a positive sequence component and a negative sequence component, 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 reduced into an active power parameter and a reactive power parameter 1 ,P 2 Value, let M 1 =
，M 2 =
In which P is 1 ,P 2 ,t 1 ，t 2 M are all known conditions, P 1 ,P 2 Is a weight value, t 1 ，t 2 For reference time points, M is given 1 Or M 2 Calculating M as any one of the preferred values 1 And M 2 Wherein M is 1 As an active power parameter, M 2 And adjusting the comprehensive condition reference value of the power and controlling the power for the reactive power parameter.
The application is provided by 1 ，a 2 The two adjusting coefficients can adjust the comprehensive condition reference value M of the power, and the coefficient x is adjusted by a sliding index averaging algorithm, so that the control is more accurate.
Claims (6)
1. The method for controlling the automatic overcurrent protection of the inverter comprises the steps of calculating a negative sequence power grid voltage peak value and a positive sequence power grid voltage peak value, calculating a positive sequence component and a negative sequence component of the power grid voltage under a static two-phase coordinate system of an unbalanced power grid, and counting an actual expected value of active power 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.
2. The inverter control automatic overcurrent protection method according to claim 1, 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 For actual desired value of active power, E 2 For actual desired value of reactive power, P 1 ,P 2 As a weight value, t 1 ，t 2 To reference a point in time, y 1 ，y 2 Positive sequence components, negative sequence components are two cross products.
3. The method of claim 1, wherein the calculating of the grid voltage positive sequence component and the grid voltage negative sequence component is performed by calculating the voltage components in a grid fundamental frequency cycle and a grid unbalanced stationary two-phase coordinate system.
4. The inverter control automatic overcurrent protection method according to claim 2, characterized in that 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.
5. The method according to claim 4, wherein the reference value of the integrated condition of power is reduced to an active power parameter and a reactive power parameter, specifically, a set P is initially set 1 ,P 2 Value, order M 1 =
，M 2 =
In which P is 1 ,P 2 ,t 1 ，t 2 M are all known conditions, P 1 ,P 2 Is a weight value, t 1 ，t 2 For reference time points, M is given 1 Or M 2 Calculating M as any one of the preferred values 1 And M 2 Wherein M is 1 As an active power parameter, M 2 Is a reactive power parameter.
6. The inverter control automatic overcurrent protection system according to claim 1, characterized by comprising a voltage peak value calculation unit for calculating a negative sequence grid voltage peak value and a positive sequence 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 static two-phase coordinate system of the unbalanced power grid; the statistical 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 calculating unit is used for calculating a comprehensive condition reference value of the power, and the weight of the comprehensive condition reference value of the modified power is calculated through iteration statistics in the 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)
| 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 |
| 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 |
-
2022
- 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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