Quasi-Z-source inverter grid-connected system and method based on active-disturbance-rejection virtual synchronous machine
A technology of virtual synchronous machine and source inverter, which is applied in the direction of single-network parallel feeding arrangement, photovoltaic power generation, etc., can solve the problems of slow dynamic response of inverter and low accuracy of traditional phase-locked loop, so as to improve the reliability of power supply performance, improve response speed and stability, and ensure the effect of closed-loop stability
Active Publication Date: 2021-05-14
NORTHEASTERN UNIV
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Aiming at the shortcomings of the existing model prediction grid-connection technology, the present invention provides a quasi-Z-source inverter grid-connection system and method based on the ADRC virtual synchronous machine, which improves the accuracy of the traditional phase-locked loop when the grid side fluctuates. The high problem and the slow dynamic response of the inverter enhance the system anti-disturbance ability
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
[0043] In order to clearly express the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.
[0044] On the one hand, this application proposes a quasi-Z source inverter grid-connected system based on an ADRC virtual synchronous machine, which is applied to a photovoltaic inverter topology with a quasi-Z source, such as figure 1 As shown, including: acquisition module, topology module, judgment module, calculation output module;
[0045] The acquisition module, topology module, judgment module, and calculation output module are sequentially connected;
[0046] The collection module is configured to collect various signals in the topology module, and transmit the various signals to the calculation module,
[0047] The topology module is used to provide a photovoltaic inverter topology of a quasi-Z source;
[0048] The judging module is used to judge the circuit working state of the ph...
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 provides a quasi-Z-source inverter grid-connected system and method based on an active-disturbance-rejection virtual synchronous machine. The quasi-Z-source inverter grid-connected system comprises an acquisition module, a topology module, a judgment module and a calculation output module. The method comprises the following steps of: collecting various signals in the topology module, and transmitting the various signals to the calculation module; judging the circuit working state of the quasi-Z-source photovoltaic inverter, and transmitting the circuit working state to the calculation output module; and calculating and establishing an objective function by using the various signals and the working state, calculating a corresponding switching state when the objective function is minimum, and providing a driving signal for the inverter bridge. According to the quasi-Z-source inverter grid-connected system and the method, the power supply reliability of the system is improved, and the inverter has a boosting function and has good adaptability to external interference, so that the closed-loop stability of the system is ensured, the inverter has better interference suppression capability and inertia, DC side voltage disturbance is effectively suppressed, and the response speed and stability of the system are greatly improved.
Description
technical field [0001] The invention belongs to the technical field of electric energy conversion of power electronics, and in particular relates to a quasi-Z source inverter grid-connected system and method based on an active disturbance rejection virtual synchronous machine. Background technique [0002] At present, the rapid development of distributed power generation and micro-grid technology has made the proportion of distributed power sources interfaced with power electronic converters in the power system continue to increase, which has greatly promoted the practical application of independent micro-grids. However, various new energy power generation has a strong intermittent and random nature, and there is a certain difference between the voltage generated by it and the grid voltage. It needs to be sorted and distributed uniformly through the interface of the power electronic converter to supply the load or meet the grid-connected conditions. Then merged into the larg...
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 IPC IPC(8): H02J3/38
CPCH02J3/38Y02E10/56
Inventor 马大中曹星晨王睿孙秋野孙城皓杜思函王鹏程朱方麟邓林江
Owner NORTHEASTERN UNIV