A Consistency-Based Distributed Control Method and System for DC Electric Springs
A distributed control and direct current technology, applied in the field of electrical engineering, can solve the problems that centralized control methods cannot achieve plug and play, and achieve the effects of avoiding mutual charging and discharging, high reliability and flexibility, and overcoming deviations
Active Publication Date: 2019-06-07
HUAZHONG UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a DC spring distributed control method and system based on consistency, the purpose of which is to solve the large errors in the existing distributed control method, and the centralized control method Unable to achieve "plug and play" technical problems
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
[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0047] like figure 1 As shown, it is a schematic diagram of the system structure of a 400V DC microgrid system composed of 4 PVs and 4 DC-ESs; the system includes a physical layer and a network layer; the physical layer includes PVs, DC-ESs and loads; the network layer includes The communication link is used to complete the information exchange between DC-ESs. Among them, the DC-ES structure d...
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 DC spring distributed control method and system based on consistency, and the system comprises a primary control unit and a secondary control unit. The method comprises primary control and secondary control. The primary control employs conventional droop control. The secondary control comprises SoC control and mean voltage control, and the SoC control and the mean voltage control respectively employ a consistency algorithm, so as to enable a mean bus voltage at a DC-ESs outlet to reach a rated value, thereby improving the voltage level of the system wholly, enabling the output power of DC-ESs to be distributed according to SoC, and preventing a single energy storage battery from being overcharged or overdischarged. The method provided by the invention solves a problem that distributed control has a control error, does not need a central controller which is necessary in centralized control, achieves the plug-and-play, improves the flexibility, robustness and expansibility of the system and is suitable for a DC microgrid system where a plurality of DC-ESs are in parallel connection. The method can be used in a microgrid system where a plurality of power supplies are connected in parallel, is used for improving the effect of a parallel-type DC-ESs stable DC bus voltage and optimizing the working conditions of an electric spring.
Description
technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a distributed control method and system for DC electric springs based on consistency. Background technique [0002] The development of DC renewable energy sources such as photovoltaic cells (Photovoltaics, PVs), fuel cells, and wind power, as well as the increase in DC load capacity have promoted the rapid development of DC microgrids. Compared with AC microgrids, DC microgrids do not have synchronization, reactive power Issues such as power transmission, harmonic currents, and inverter losses require only a simple power electronics interface for more efficient power transmission. DC micro-grid technology has been widely used in ship systems, household power systems and telecommunication systems. However, due to the intermittent nature of renewable energy and unpredictable fluctuations in loads, instantaneous power imbalances may occur in the DC mi...
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): H02J1/10H02J7/34
CPCH02J1/082H02J1/10H02J7/34
Inventor 陈霞石梦璇孙海顺
Owner HUAZHONG UNIV OF SCI & TECH