Simplified modeling method for DC distribution network AC/DC converter based on droop control
A technology of DC distribution network and modeling method, which is applied in the direction of DC network circuit device, AC network circuit, power transmission AC network, etc., and can solve the problem of system simulation speed decrease, harmonic content increase, single converter refined model simulation The state is not very concerned about issues such as high-efficiency simulation speed and the effect of eliminating influence and loss
Active Publication Date: 2019-03-22
STATE GRID JIBEI ELECTRIC POWER COMPANY +2
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
With the expansion of the simulation scale of the DC distribution network, the simulation is carried out with the refined model of the AC / DC converter. Due to the application of a large number of power electronic switching devices in the model, the simulation speed of the system will be severely reduced, and the harmonic content will also increase. The amplitude increases, and in severe cases, the system will not converge, which affects the efficiency and accuracy of the entire system simulation
Moreover, for the system-level DC distribution network simulation, more emphasis is placed on the coordination between converters and the control strategy research at the system level, while the simulation status of the refined model of a single converter is not very concerned.
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
[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] figure 2 Schematic diagram of a simplified model constructed for the simplified modeling method of AC / DC converters in DC distribution networks based on droop control. The simplified model includes two aspects:
[0037] On the one hand, the simplified model 30 of the AC / DC converter includes: the AC part model 10 of the AC / DC converter and the DC part model 20 of the AC / DC converter. The AC part model 10 of the AC / DC converter is equivalent to a controlled AC voltage source 11 and a line inductance 12 connected in series; the end of the line inductance 12 far away from the controlled AC voltage source 11 is connected to the AC grid, and the controlled AC One end of the voltage source 11 away from the line inductance 12 is directly grounded. The DC part model 20 of the AC / DC converter is equivalent to a first impedance 21, a ...
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 relates to the technical field of simulation modeling of a DC distribution network AC / DC converter, and proposes a simplified modeling method for a DC distribution network AC / DC converter based on droop control. The simplified modeling method comprises the two steps of constructing an AC / DC converter simplified model and constructing a droop controller simplified model. The AC / DC converter simplified model comprises an AC portion simplified model formed by serially connecting a controlled AC voltage source and a line inductor, and a DC portion simplified model formed by seriallyconnecting a first impedor, the controlled AC voltage source and a second impedor. The droop controller simplified model comprises a Q-U controller simplified model and a P-F controller simplified model, controls a direct voltage of the DC portion simplified model to realize AC / DC active power error-free tracking, and controls an alternating voltage and an AC frequency of the AC portion simplifiedmodel to realize P-f and Q-U droop control of the converter. The simplified models have high simulation rate, the loss of power electronic switching devices of detailed models of the converter is eliminated, and the simplified modeling method is suitable for the stability analysis and control research of a DC distribution network system.
Description
technical field [0001] The invention relates to the technical field of simulation modeling of AC / DC converters of DC distribution networks, in particular to a simplified modeling method for AC / DC converters of DC distribution networks based on droop control. Background technique [0002] With the depletion of traditional fossil energy, the development of modern power electronics technology, the development of more and more distributed energy sources and the emergence of various DC loads, the DC distribution network is convenient for distributed energy access and line loss Low power consumption, no reactive power loss, low harmonic content, no three-phase imbalance in the AC system, high transmission efficiency, convenient energy storage access and many other advantages, so it has a very broad application prospect. [0003] At present, the control strategy of the DC distribution network is not yet mature, and the related coordinated control methods of the flexible DC distribu...
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 Applications(China)
IPC IPC(8): H02J3/36H02J1/00
CPCH02J1/00H02J3/36H02J2203/20Y02E60/60
Inventor 覃朝云朱晓岭梁东杨静张建王冰冰宗瑾龙飞梅军刘坤潘宇董桐杨硕
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY