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Robust droop control device and method for DC distribution network

A technology of DC distribution network and DC controller, which is applied to DC network circuit devices, circuit devices, parallel operation of DC power supplies, etc., can solve the problem of large bus voltage drop, unbalance, and unsatisfactory DC-DC converter circulating current suppression. and other problems, to achieve the effect of improving accuracy, improving stability, eliminating uneven current distribution and circulating current problems

Active Publication Date: 2018-03-13
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the unbalanced line impedance in the prior art affects the equal sharing of load power among DC-DC converters, the bus voltage drop is too large and the circulation suppression between DC-DC converters is not ideal

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  • Robust droop control device and method for DC distribution network
  • Robust droop control device and method for DC distribution network
  • Robust droop control device and method for DC distribution network

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Embodiment Construction

[0037] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0038] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0039] The present invention provides a robust droop control device for a DC distribution network, such as figure 1 , 2 , 3, the device includes: a robust DC controller, a droop controller, an inte...

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Abstract

The invention relates to a robust droop control device and method for a direct-current powder distribution network. The device comprises a robust direct-current controller, a droop controller, an integral module, a PI controller and a pulse width modulation driver. The robust direct-current controller and the droop controller are connected with the integral module which is connected with the PI controller. The PI controller is connected with the pulse width modulation driver. Load voltage serves as the feedback quantity, so that line impedance between DC-DC converters and a direct-current bus is converted into equivalent output impedance of the DC-DC converters, the problems of uneven current distribution among the DC-DC converters due to unbalance of the line impedance and ring currents are eliminated, and precision of current distribution is improved; moreover, an output value of the robust direct-current controller and an output value of a traditional droop controller are adopted for obtaining the difference, difference values are integrated, integrals are input into the PI controller to restrain the voltage drop rate of the direct-current bus, and the problem that the voltages drop range is too large is solved.

Description

technical field [0001] The invention relates to the technical field of droop control, in particular to a robust droop control device and method for a DC distribution network. Background technique [0002] With the depletion of traditional fossil energy and increasing environmental pressure, the energy structure is undergoing a transition period from traditional energy to renewable energy. my country has a vast territory and abundant wind energy resources, marine resources and biomass resources, which provide a basic premise for my country's energy structure adjustment. [0003] The decentralized nature of new energy makes it more suitable for supplying power to loads as a distributed power source in the form of a microgrid. Many types of electrical equipment in daily life are essentially driven by DC power. Common distributed power sources can be directly produced or indirectly converted into DC power. Providing energy to the load in the form of DC can save a lot of rectif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10
CPCH02J1/102H02J1/106
Inventor 帅智康
Owner HUNAN UNIV
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