A Digital Current Sharing Method for Non-master Distributed DC Power System
A DC power supply system, decentralized technology, applied in the direction of parallel operation of DC power supplies, can solve the problems of the power system losing the current sharing function, not considering the difference in dynamic characteristics of the power module, and the current sharing algorithm is too simple, etc., to achieve stable and reliable communication, The effect of good dynamic current sharing transient performance and good transient response
Inactive Publication Date: 2016-08-24
SOUTH CHINA UNIV OF TECH
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the existing data current sharing technology has the following disadvantages: Generally, an external current sharing controller is required to complete the collection and distribution of current data of each module. Once the external controller fails, the entire power system will lose the current sharing function; through data communication The information obtained is only current information, and the current sharing algorithm is too simple, mainly based on static current sharing (steady-state current sharing), without considering the difference in dynamic characteristics (transient characteristics) of each power module
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
[0036] The specific embodiments of the present invention will be described below with reference to the accompanying drawings, but the implementation and protection of the present invention are not limited thereto.
[0037] figure 1 with figure 2 The use of CAN bus and I 2 The block diagram of the unowned distributed DC power supply system of C bus. The CAN bus needs to be connected to two matching impedances, which are located at the two ends of the two transmission lines CAN_H and CAN_L, generally 120Ω resistance; I 2 The two transmission lines SCL and SDA of the C bus need to be connected with pull-up resistors. The value range of the pull-up resistors is relatively wide, which can be N×4.7KΩ, where N is the number of parallel power modules.
[0038] Table 1 and Table 2 respectively show the use of CAN bus and I 2 The format of the message packet of the C bus, the format of the address field are different to suit their respective data link layer standards, and the data field use...
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 digital current sharing method for an independent distributed direct current power supply system. After each power module of the present invention obtains the working parameters of other power modules, it calculates the average load rate, current correction amount, average control channel response speed and the proportional gain of the current voltage loop controller in combination with its own working parameters, so as to realize the current correction amount and voltage The update of the proportional gain of the loop controller. The present invention adopts CAN bus or I 2 C bus communication mode, especially I 2 The C bus can be supported by most microprocessors, and has high cost performance. The status of each power module is equal, and it supports "N+m" redundant design. If one of the power modules fails, the output of the entire parallel system will not be affected, and The faulty power supply can be replaced online, and power modules with the same output voltage but different power levels can be connected in parallel, and it has good dynamic current sharing characteristics when the load changes greatly, and the data communication rate is not required.
Description
Technical field [0001] The invention relates to a current sharing technology for a high-power power supply system composed of a plurality of direct current power supply modules in parallel, and in particular to a digital current sharing method for an unmaintained distributed direct current power supply system. Background technique [0002] In high-power DC power supply systems, multiple power modules of lower power are often used in parallel to achieve large current output. The parallel combination meets different power requirements, which is easy to achieve standardized production, and high reliability can be guaranteed through redundant backup. . Due to factors such as process level, component parameter differences, and temperature drift, even if the power modules of the same model are used, the current sharing output can not be achieved through simple parallel connection. A power module with a large load current will shorten the lifespan, and even a domino effect will acceler...
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): H02J1/10
Inventor 李向阳
Owner SOUTH CHINA UNIV OF TECH