H-infinity control method of micro-grid frequency based on hybrid sensitivity

A technology of mixed sensitivity and control method, applied to a single AC network with different frequencies, electrical components, circuit devices, etc., can solve the problems of fuzzy PID control membership functions such as strong experience, weak robustness, and frequency fluctuations

Active Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

Due to the fluctuation of WP, PV and Load, the power fluctuation and frequency fluctuation of the microgrid are caused
For the frequency control of the microgrid, Frequency control in micro-grid power system combined with electrolyzer system and fuzzy PI controller (Journal of Power Sources, 180(2008): 468-475) proposed a fuzzy PID control method, However, there are many problems in the design of the controller, such as many intermediate conversion processes, strong experience of the fuzzy PID control membership function, complex control rules, and weak robustness.

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  • H-infinity control method of micro-grid frequency based on hybrid sensitivity
  • H-infinity control method of micro-grid frequency based on hybrid sensitivity
  • H-infinity control method of micro-grid frequency based on hybrid sensitivity

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is based on H ∞ The hybrid sensitivity microgrid frequency control method and controller are described in detail. The controlled objects involved in this example are micro gas turbines and electrolyzers.

[0056] In this example based on H ∞ The mixed-sensitivity microgrid frequency control method includes the following steps:

[0057] (1) The parameter values ​​of a certain microgrid are shown in Table 1, and it can be seen that the controlled object

[0058] Table 1 parameter values

[0059]

[0060] (2) Let ω d =0.5, u max = 1000, then the parameters selected to meet the constraints are: K 1 =20,K 2 =0.001,K 3 = 0.1, A = 5, ω c =20, so the weighting functions are W 2 =0.001, W 3 = 1 100 s + 1 10

[0061] (3) Solve the closed-loop system tra...

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Abstract

The invention provides an H-infinity control method of micro-grid frequency based on hybrid sensitivity. The method comprises the following steps of setting a relational expression of a micro-grid frequency deviation delta f and a power deviation delta P to establish a transfer function of a controlled object, establishing a sensitivity function S and a complementary sensitivity function T, constructing weighting functions W1, W2 and W3 meeting constraint conditions, establishing a closed loop system transfer function of a generalized controlled object of a micro-grid to obtain a transfer function of an H-infinity controller, and according to the transfer function of the H-infinity controller, obtaining an MT controller and an ES controller through solving. The method can design the controller according to a performance requirement of the micro-grid, and can quickly obtain a control parameter of the H-infinity controller, and the robust stability, the dynamic performance and the interference resistance of a micro-grid system are effectively improved.

Description

technical field [0001] The invention belongs to the robust control technology, in particular to a microgrid frequency H based on hybrid sensitivity ∞ The control method is applicable to a microgrid composed of a wind power generation system, a photovoltaic power generation system, a micro gas turbine, a fuel cell, an electrolyzer system for producing hydrogen with controllable load, and an electric load. Background technique [0002] With the increase of energy demand and the depletion of fossil energy, the change of energy structure forces people to actively seek and develop green and recyclable new energy. Solar energy and wind energy have effectively alleviated energy demand, but the instability of wind energy and solar energy is a serious challenge to the quality of electric energy and the stability of the power grid. Micro-grid (referred to as micro-grid) came into being as the times require, and it is a new direction for the development of the electric power industry....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02J3/24
CPCH02J3/24H02J3/381
Inventor 李相俊陈金元谢巍王立业惠东
Owner STATE GRID CORP OF CHINA
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