Full-distributed self-optimal-tracing constant power control method for isolated island operation of micro grid
A constant power control, fully distributed technology, applied in the direction of single-network parallel feeding arrangement, AC network circuit, electrical components, etc., can solve the problems of difficult to achieve coordinated control of generators, high control algorithm, and high complexity of communication network design
Active Publication Date: 2015-04-29
ZHEJIANG UNIV
View PDF3 Cites 10 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
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
specific Embodiment
[0068] In the Simulink component of Matlab software, set up a typical isolated island AC microgrid, including three distributed generators with a capacity of 1MW, and two synchronous generators; three distributed generators adopt the control method proposed by the present invention to generate synchronously The role of the machine is to provide frequency support for distributed generators, such as figure 2 shown, where R 1 , L 1 ,C 1 , R 2 , L 2 ,C 2 are line impedances. The microgrid system parameters are as follows:
[0069] S i =1MW,T 2 =2s,T 3 =2.5s,α=20,β=1 / 3,f min =49Hz,f max =51Hz
[0070] image 3The cost micro-increase rate curve of each distributed generator is given, Figure 4 The modified nonlinear droop 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:
[0071] Putting in the load at 30s, increasing the total system load to 3.0MW; pu...
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 full-distributed self-optimal-tracing constant power control method for isolated island operation of a micro grid. According to the method, target frequencies of distributed generators are obtained with a thrice hierarchical control method; PI control is conducted on the detected voltage frequencies of outlet sides of the distributed generators and the obtained target frequencies of the distributed generators together, and feedback components of active power reference values are obtained; through a frequency-power inverse droop curve, feed-forward components of the active power reference values are obtained; the active power reference values of all the distributed generators are obtained by adding the feedback components and the feed-forward components, and therefore full-distributed self-optimal-tracing constant power control over the micro grid is achieved. According to the full-distributed self-optimal-tracing constant power control method, under the condition of without a micro grid center controller and a communication system, loads can be shared by the distributed generators according to the equal incremental principle, the method can be applied to economic dispatch of the isolated island micro grid, and the micro grid can operate in the optimal mode.
Description
technical field [0001] The invention relates to a control method for microgrid isolated island operation, in particular to a fully distributed self-optimizing constant power control method for microgrid isolated island operation. Background technique [0002] With the continuous expansion of the grid scale, the disadvantages of ultra-large-scale power systems are becoming more and more prominent. As an important solution to accept new energy and improve the reliability of power systems, distributed generation has attracted 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. To a certain extent, it shares the function of the transmission network from the power pl...
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 IPC IPC(8): H02J3/46H02J3/00
CPCH02J3/00H02J3/388H02J3/46
Inventor 辛焕海赵睿章雷其乐程毅何小良洪敏汪震杨欢
Owner ZHEJIANG UNIV