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A Mixed Sensitivity Based Microgrid Frequency h ∞ Control Method

A technology of mixed sensitivity and control method, which is applied to a single AC network with different frequencies, electrical components, circuit devices, etc., can solve the problems of weak robustness, complex control rules, and many intermediate conversion processes, so as to improve the robustness Rod stability, simplified control methods, and convenient operation and maintenance

Active Publication Date: 2017-07-14
STATE GRID CORP OF CHINA +2
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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 control of microgrid frequency, Frequency control in micro-grid powersystem combined with electrolyzer system and fuzzy PI controller (Journal of Power Sources, 180(2008): 468-475) proposed a method of fuzzy PID control, but the In controller design, there are many intermediate conversion processes, fuzzy PID control membership function is empirical, complex control rules, and weak robustness, etc.

Method used

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  • A Mixed Sensitivity Based Microgrid Frequency h <sub>∞</sub> Control Method
  • A Mixed Sensitivity Based Microgrid Frequency h <sub>∞</sub> Control Method
  • A Mixed Sensitivity Based Microgrid Frequency h <sub>∞</sub> Control Method

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is based on H ∞ The mixed 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 hybrid 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 that satisfy the constraints are selected as: 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,

[0061] (3) The closed-loop system transfer function T of the generalized controlled object is obtained by solving zw (s) as follows:

[0062]

[0063] By boundary conditions:

[0064]

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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 robust control technology, in particular to a hybrid sensitivity-based microgrid frequency H ∞ 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 and a load-controllable electrolyzer system, and an electricity load. Background technique [0002] With the growth of energy demand and the depletion of fossil energy, changes in energy structure force people to actively seek to develop green and recyclable new energy. Solar energy and wind energy have effectively alleviated the energy demand. However, the instability of wind energy and solar energy is a serious challenge to the quality of electric power and the stability of the power grid. Micro grid (referred to as micro grid) emerged as the times require, which is a new direction for the development of the power industry....

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Application Information

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Patent Type & Authority Patents(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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