Islet microgrid full-distribution type self-optimization-trending control method based on power control
A fully distributed, control method technology, applied in the direction of AC network circuit, single network parallel feeding arrangement, electrical components, etc., can solve the problems of high control algorithm, difficulty in realizing coordinated control of generators, high complexity of communication network design, etc. Achieve good steady state and dynamic performance
Active Publication Date: 2015-04-29
ZHEJIANG UNIV
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Problems solved by technology
However, distributed control has high requirements on the control algorithm, and the design complexity of the communication network is high, so it is difficult to realize the coordinated control between the generators
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[0054] In Matlab / Simulink, set up a typical AC micro-grid running in an island, including three distributed generators and two synchronous generators with a capacity of 1MW; the three distributed generators adopt the control method proposed by the present invention to synchronize The role of the generator is to provide frequency support for distributed generators, such as figure 2 shown. The microgrid system parameters are as follows:
[0055] S i =1MW,T 2 =2s, T 3 =0.1s,α=20,β=1 / 3,f min =49Hz,f max =51Hz
[0056] image 3 The cost micro-increase rate function curves of three distributed generators are given, Figure 4 The inverted sag curve adopted by the distributed cubic control method is given. The initial total load of the microgrid system is 2.5MW, and the embodiment considers two situations:
[0057] The load is put into operation at 30s to increase the total system load to 3.0MW; the load is put into operation at 45s to increase the total system load to 3.5M...
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The invention discloses an islet microgrid full-distribution type self-optimization-trending control method based on power control. Distribution type power generator outlet side voltage frequencies without quadratic components are obtained with a distribution type secondary control method; primary components of active power reference values are obtained with a distribution type primary control method; third-time components of the active power reference values are obtained with a distribution type third-time control method; the active power reference values of a distribution power generator are obtained through calculation, and full-distribution type self-optimization-trending constant power control over a microgrid is carried out. The islet microgrid full-distribution type self-optimization-trending control method is based on a control thinking with hierarchical control; under the condition that a microgrid central controller and a communication system are not used, the microgrid can have the economic dispatching function with an equal incremental rate criterion as a basis in third-time control, the good dynamic behavior of a linear droop control method in primary control cannot be lost, and the function of secondary control is considered. The distribution type power generator directly participates in economic dispatching of the islet operation microgrid, and the microgrid is in the economy-optimal operating mode.
Description
technical field [0001] The invention relates to a control method for micro-grid isolated operation, in particular to a fully distributed self-optimization control method based on power control for an isolated island micro-grid. Background technique [0002] At present, with the continuous expansion of the grid scale, the disadvantages of the traditional power system are becoming more and more prominent. At the same time, the increasing consumption of traditional fossil fuels has also brought enormous pressure to the environment. In order to solve the above problems, distributed generation has begun to receive widespread attention in recent years. Distributed power generation refers to the power generation facilities arranged directly on the distribution network or distributed near the load, which can generate electricity economically, efficiently and reliably. Distributed power generation is flexible and decentralized, and can be used as a backup with the large power grid. ...
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Login to View More IPC IPC(8): H02J3/46
CPCH02J3/388H02J3/46
Inventor 辛焕海赵睿章雷其乐程毅何小良杨欢汪震
Owner ZHEJIANG UNIV