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Direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation

A technology of bidirectional converter and hybrid micro-grid, which is applied in the direction of converting AC power input to DC power output, AC network circuit, single-network parallel feeding arrangement, etc., which can solve the problem of uncontrollable hybrid micro-grid and increase the reliability of power supply performance, increase hardware costs, and ensure normal operation

Active Publication Date: 2015-07-22
SHANDONG UNIV
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Problems solved by technology

This method can realize the distributed control of multiple bidirectional converters operating in an island, and can theoretically overcome the uncontrollable problem of the hybrid microgrid caused by the traditional hierarchical control strategy when the upper central controller fails to communicate.

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  • Direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation
  • Direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation
  • Direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] figure 1 It is a structural diagram of a hybrid microgrid parallel bidirectional converter system. The main circuit of the bidirectional converter is a two-level DC / AC converter. The DC side capacitor is connected to one end of the two IGBT tubes of each bridge arm, and the filter is an LCL filter. The DC side is connected in parallel with the public DC load, and the AC output terminal is connected to the power grid. The DC sides of N bidirectional converters with the same topology are connected in parallel, and the AC output terminals of the filters are connected in parallel. N sets of bidirectional converters can provide power to the public DC load 1 and the public DC load 2 at the same time.

[0044] The signal conditioning circuit conditions the relevant signals measured by the Hall sensor to obtain an analog signal that the sampling circui...

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Abstract

The invention discloses a direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation. A bottom hierarchy adopts droop control based on local information; a second hierarchy adopts a direct-current-side voltage distributed secondary control strategy; a third hierarchy adopts a strategy that a direct-current bus voltage of each bidirectional transducer is received to obtain a real-time average value of the direct-current bus voltages by means of direct-current bus voltage estimation and the real-time average value of the direct-current bus voltages is taken as a reference voltage value of a voltage secondary controller. By adoption of the direct-current-side distributed hierarchical control method, distributed control of the plurality of bidirectional transducers in isolated island operation can be realized, and the problem of uncontrollable voltage drop of a hybrid microgrid in isolated island operation when an upper central controller is in communication failure due to traditional hierarchical control strategies can be solved theoretically.

Description

technical field [0001] The invention relates to a distributed hierarchical control method of a DC side of a hybrid micro-grid bidirectional converter operating in an isolated manner. Background technique [0002] In the context of the dual crisis of energy and environment, distributed power generation of renewable clean energy has become an important way for human beings to seek development. In order to solve many problems in grid-connected distributed generation, micro-grid technology came into being. However, whether it is a pure AC microgrid or a DC microgrid, the absorption of this part of renewable energy will face the problems of low efficiency and reliability caused by frequent power conversion. In addition, pure AC or DC microgrids have similar defects for AC loads and emerging DC loads. Considering the economical operation of distributed generation of renewable energy, it is an inevitable choice to allocate them reasonably to different buses and form an AC / DC hybr...

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Application Information

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IPC IPC(8): H02J3/38H02M7/797
CPCH02J3/381H02J3/388H02M7/797
Inventor 陈阿莲李玉琢杜春水段彬张承慧
Owner SHANDONG UNIV
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