Droop method based direct current micro-grid and control method thereof
A DC micro-grid and control method technology, applied in the field of power quality management, can solve many problems, and achieve the effects of preventing too large or too small, easy to expand, and simple circuit topology
Inactive Publication Date: 2017-02-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology
Considering that there are many ways to process the output data of parallel converters, not many have been studied so far
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[0032] The present invention will be specifically introduced below in combination with specific embodiments and accompanying drawings.
[0033] see figure 1 and figure 2 As shown, the DC microgrid based on the droop method of the present invention includes a first DC voltage source 1 , a first Boost converter 2 , a second DC voltage source 3 , a second Boost converter 4 and a converter load 5 .
[0034]The first DC voltage source 1 includes a DC voltage source U1. The second DC voltage source 3 includes a DC voltage source U2. The first Boost converter 2 includes a filter capacitor C1, a freewheeling inductor L1, an N-channel MOSFET switch Q1, a diode D1 and a filter capacitor C2. Both ends of the filter capacitor C1 are respectively connected to one end of the freewheeling inductor L1 and the source S of the N-channel MOSFET switch tube Q1. The other end of the freewheeling inductor L1 is connected to the drain of the N-channel MOSFET switch Q1 and the anode of the diode...
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The invention discloses a droop method based direct current micro-grid. A novel control method can overcome current inequality and voltage reduction of conventional droop method parallel-connected converters. The invention provides the novel control method applying to the direct current micro-grid, the novel control method based on low-bandwidth communication comprises a current regulating ring and a voltage regulating rind. The control method has the advantages that the current regulating ring adjusts itself according to the current output to eliminate the influence of line impedance and equate with output impedance of converters, each converter can adjust the output characteristics to the same, once the droop coefficient adapts the micro-grid, the droop coefficient remain unchanging. And a voltage reference ring can increase the output voltage reference value to counteract the decrease of busbar voltage brought by droop control for compensating the drop of busbar voltage. The control method also applies low-bandwidth to resolve the system reliability decrease and abnormal operation caused by the host or communication problems in high speed communication.
Description
technical field [0001] The invention belongs to the field of power quality management, and in particular relates to a DC micro-grid based on a droop method and a control method thereof. Background technique [0002] With the reduction of global fossil energy and the increasingly serious environmental pollution problems, distributed power has been valued and developed by various countries. The traditional power grid is in the form of AC, so the earliest micro-grid is also an AC micro-grid. Compared with the AC microgrid, the DC microgrid that appeared later has more advantages in terms of phase and frequency, and has received more and more attention. Photovoltaic cells and batteries form one of the simplest DC microgrids, suitable for use in residential areas, and they form a basic DC voltage source. [0003] In the DC microgrid, the DC voltage sources mostly operate in parallel. In order to achieve balanced power output, the main control methods are the master-slave control...
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IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 马爱华李磊师贺管月郭伟龚坤珊
Owner NANJING UNIV OF SCI & TECH