Automatic equalizing switch network, direct-current converter, control system and control method
A DC converter and switch network technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as reduced system reliability, increased complexity and cost of the control system, and voltage divergence , to achieve the effect of reducing the difficulty of control, realizing the ability of automatic voltage equalization, and avoiding voltage divergence
Inactive Publication Date: 2021-04-06
HUNAN UNIV
View PDF5 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the electrical parameters of the sub-modules are inconsistent and the control signals are inconsistent, the voltage on the input equalizing capacitor may diverge, reducing the reliability of the system
In order to balance the voltage of the input voltage equalizing capacitor, an additional input voltage equalization control is often required. The input voltage equalization control needs to sample the input voltage information of each sub-module. Since there is a steady-state potential difference in the input voltage of each sub-module, isolation sampling with high insulation is often It is necessary to transmit the control signal to each sub-module after optical fiber transmission to the low-voltage side, which greatly increases the complexity and cost of the control system when the number of sub-modules is large
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
[0038] Such as figure 1 , the automatic voltage equalizing switch network of the present invention includes n half-bridge sub-modules, each half-bridge sub-module includes two parallel branches, one of which is a series branch formed by connecting two power switch tubes in series, The other branch is a DC capacitor (voltage equalizing capacitor). E.g, figure 1 Among them, half-bridge sub-module 1 includes power switch tube S1, power switch tube S2 and DC capacitor C1; power switch tube S1 and power switch tube S2 are connected in series, and DC capacitor C1 is connected in parallel with the branch circuit where power switch tube S1 and power switch tube S2 are located . In the present invention, two adjacent half-bridge sub-modules share one power switch tube. from figure 1 It can be seen that the half-bridge sub-module 1 and the half-bridge sub-module 2 share the power switch tube S2, and the half-bridge sub-module n-2 and the half-bridge sub-module n-1 share the power s...
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 an automatic equalizing switch network, a direct-current converter, a control system and a control method. The automatic equalizing switch network comprises four parts: an automatic equalizing switch network, a resonant cavity circuit, a rectification circuit and a filter circuit, wherein the automatic equalizing switch network is connected with two ends of an input voltage, and two ends of the filter circuit are connected with a load. According to the invention, an input end adopts a series structure, so the voltage stress of a power switch tube is reduced; in a switching period, each input equalizing capacitor is connected with an adjacent input equalizing capacitor in parallel for voltage sharing, so voltage balance of the input equalizing capacitors is realized without additional input equalization control, the risk of divergence of the input equalizing capacitors of the system is avoided, input voltage information of each sub-module does not need to be sampled, and control complexity is simplified; all the power switch tubes are controlled by adopting a unified switching frequency, so control difficulty is further reduced; and all the power switch tubes and high-frequency rectifier diodes realize soft switching, so the efficiency of the converter is improved.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to an automatic voltage equalizing switch network, a DC converter, a control system and a control method. Background technique [0002] HVDC transmission system has the advantages of high power density and low transmission line loss, and is widely used in industrial distribution networks, new energy power generation, and electrified railways. But for the power distribution network and users, there are generally only a few hundred volts. It is used for high transformation ratio between high-voltage power transmission (tens of kilovolts) and low-voltage power consumption (hundreds of volts) (high transformation ratio means that the ratio of input voltage to output voltage is very large: for example, the high-voltage input voltage level is tens of thousands volts, and the output voltage is hundreds of volts) step-down DC converter is one of the key devices to realize the int...
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): H02M3/335
CPCH02M3/33523H02M3/33569Y02B70/10
Inventor 何志兴肖子衡罗安高兵刘阳梁如鑫董宏宇伍文华徐千鸣
Owner HUNAN UNIV