Harmonic current suppression method of grid-connected inverter and readable storage medium
A harmonic current and inverter technology, applied in the field of harmonic current suppression methods and readable storage media of grid-connected inverters, can solve the problems of power grid power quality decline, optimization, lack of harmonic current suppression capability, etc. Improves harmonic current suppression capability and eliminates coupling effects
Active Publication Date: 2021-01-29
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] However, the online measurement of grid impedance needs to inject shock signals or periodically changing signals into the grid, which will cause the power quality of the grid to decline, and when multiple grid-connected inverters are connected in parallel, the physical meaning of the measurement results of grid impedance is not clear. Obviously, the ability to suppress harmonic currents still lacks further optimization
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0032]The present invention will be further described below with reference to the drawings and embodiments.
[0033]The first embodiment of the present invention provides a method for suppressing harmonic current of a grid-connected inverter, such asfigure 1 As shown, the method includes the following steps:
[0034]Establish a mathematical model of the grid-connected inverter system;
[0035]Calculate the reference value of the grid-connected system based on the mathematical model, and determine the system link parameters according to the reference of the grid-connected system;
[0036]Solving the system state feedback control parameters according to the reference value of the grid-connected system and the system link parameters;
[0037]The grid-connected inverter system is controlled based on the system state feedback control parameter.
[0038]The introduction of the method of the invention in the reference value calculation link of the grid-connected system eliminates the coupling between the sy...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for suppressing a harmonic current of a grid-connected inverter and a readable storage medium and relates to the technical field of electric power system. The method for suppressing the harmonic current of the grid-connected inverter comprises the following steps: a mathematical model of a grid-connected inverter system is built; a reference value of a grid-connected system is calculated based on the mathematical model, and system link parameters are determined according to reference of the grid-connected system; system state feedback control parameters are solved according to the reference value of the grid-connected system and the system link parameters; the grid-connected inverter system is controlled based on the system state feedback control parameters. According to the method disclosed in the invention, introduction of a reference value calculation link in the grid-connected system can help eliminate coupling connection between system stability and harmonic current suppressing capability, and harmonic current suppressing capability of the grid-connected inverter can be improved.
Description
Technical field[0001]The invention relates to the technical field of power systems, in particular to a method for suppressing harmonic current of a grid-connected inverter and a readable storage medium.Background technique[0002]Because the grid structure in the microgrid is flexible and changeable, the grid impedance often exhibits a wide range of time-varying characteristics. For the three-phase LCL grid-connected inverter connected to the microgrid, an unknown amount of change is introduced into its mathematical model, which will cause the resonant frequency of the LCL filter to shift and reduce the bandwidth of the control system. The stability of the control system brings great challenges. In order to improve the stability of the system, the existing methods mainly have two ideas. One adopts the method of on-line measurement of grid impedance to eliminate the parameter perturbation in the mathematical model of the grid-connected inverter, and then calculate the controller parame...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M7/48H02J3/38H02J3/01
CPCH02J3/01H02J3/38H02M1/126H02M7/48Y02E40/40
Inventor 马兴付昂张友强朱小军董光德王瑞妙杨爽方辉周敬森
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST