A Power-Frequency Oscillation Analysis Method for Multi-Virtual Synchronous Generator Grid-connected System
A technology of virtual synchronization and analysis method, applied in the direction of reducing/preventing power oscillation, parallel feeding arrangement of a single network, etc., can solve the problems of not considering the output power response angle frequency response, restricting the application, etc., to achieve a wide range of applications, high accuracy High, simple model effect
Active Publication Date: 2021-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the existing P / ω "admittance" model only considers the response of the output power of each VSG under the action of disturbance, and does not consider the output power response and angular frequency response under the input of the active power command value that are more concerned in practice, which restricts its application. Application of Power-Frequency Characteristic Analysis of Multi-machine System
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
[0034] Below in conjunction with the accompanying drawings, the examples are described in detail. The present invention proposes a method for analyzing the power-frequency oscillation characteristics of multi-virtual synchronous generators (VSG) connected to the grid, and proposes that the active power and frequency control loops of VSGs be equivalent to include the first And the two-terminal network of the second P / ω "admittance", which makes it possible to fully describe the power-frequency response characteristics of the VSG. Considering the influence of the grid impedance, the P / ω "admittance" model of the multi-VSG parallel system is further constructed. Based on the node P / ω "admittance" matrix, the factors affecting the output power of the grid-connected VSG are deduced, and the power frequency of the multi-VSG grid-connected system is analyzed through the transfer function when the number of grid-connected VSGs, the equivalent impedance of the grid, and the inertia cons...
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 present invention proposes a method for analyzing power-frequency oscillation characteristics of a multi-virtual synchronous generator (VSG) grid-connected system, which equates the active power and frequency control loops of VSGs to include the first and second P / ω "admittances" The two-terminal network comprehensively describes the power-frequency response characteristics of the VSG; considering the influence of grid impedance, the P / ω "admittance" model of the multi-VSG parallel system is constructed; based on the node P / ω "admittance" matrix, the influence is derived and The factors of grid-connected VSG output power are analyzed through the transfer function when the number of grid-connected VSGs, the equivalent impedance of the grid and the inertia constant change, the power-frequency oscillation characteristics and changing rules of the multi-VSG grid-connected system. The modeling method proposed by the present invention, which equates the VSG active power and frequency control loops to include the first and second P / ω "admittance" two-terminal networks, is also applicable to VSGs using other control schemes, and has the advantages of simple model, applicable With the advantages of wide range and high accuracy, it can be easily applied to the research of the stability of multi-VSG grid-connected systems and the analysis of power-frequency oscillation characteristics.
Description
technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a method for analyzing power frequency oscillation characteristics of a multi-virtual synchronous generator grid-connected system. Background technique [0002] The inertia parameters and primary frequency regulation capacity of the power system are crucial to active frequency adjustment, frequency stability and even safety and stability. The grid-connected large-scale new energy power generation occupies the capacity space of synchronous generators with moment of inertia, causing the power system to face the problems of inertia reduction and insufficient frequency regulation capability. When there is a power imbalance in the system and there is an energy gap, the smaller the unit inertia and the adjustment coefficient, the larger the two frequency indicators of the system frequency change rate and the maximum frequency deviation are, which is not conducive to...
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): H02J3/48H02J3/38H02J3/24
CPCH02J3/24H02J3/38H02J3/48
Inventor 徐永海秦本双袁敞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)