Coordinated control method of cooling-heating-power cogeneration system of micro gas turbine

A micro gas turbine, combined cooling, heating and power technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as controlled quantity constraint and large inertia

Active Publication Date: 2016-06-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a coordination of the micro gas turbine combined cooling, heating and power system for the traditional PID control in dealing with the shortage of controlled quantity constraints and large inertia problems in the combined cooling, heating and power supply system of the micro gas turbine. Control Method

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  • Coordinated control method of cooling-heating-power cogeneration system of micro gas turbine
  • Coordinated control method of cooling-heating-power cogeneration system of micro gas turbine
  • Coordinated control method of cooling-heating-power cogeneration system of micro gas turbine

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Embodiment 1

[0067] The control method of the present invention is applied to the simulation model of the MGT-CCHP system that a 80kW heat recovery micro gas turbine and a 425kW double-effect lithium bromide absorption refrigerator form, such as figure 1 shown. This triple power supply system can output electric energy, and at the same time provide domestic hot water at 60-80°C and refrigerant water at 7-12°C (for cooling). The control goal is to achieve good tracking of power supply, heating and cooling loads on the user side

[0068] The invention proposes a coordinated predictive control method for a micro gas turbine combined cooling, heating and power supply system, which can deal with control problems such as controlled quantity constraints, large delays, and multivariable systems, and can further improve the response speed to user loads and reduce dynamics. Deviation, thereby improving the quality of power supply, heating and cooling. Including the following steps:

[0069] (1) O...

Embodiment 2

[0091] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments. Aiming at the simulation model of the MGT-CCHP system composed of an 80kW regenerative micro gas turbine and a 425kW double-effect lithium bromide absorption refrigerator, the present invention designs a three-input and three-output coordinated predictive control system, so that the fuel on the side of the micro gas turbine flow control valveu mbf and the reheat valve opening u on the side of the double-effect LiBr absorption chiller re , high pressure refrigerant valve opening u hgr Able to work in harmony while efficiently handling the large inertia on the chiller side, making the three output variables (turbine speed y n (r / min), refrigerant water temperature y Tclo (°C) and domestic hot water temperature y Thwo (°C)) can well track the load command on the user side and improve the adjustment quality.

[0092] The control block diagram o...

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Abstract

The invention discloses a coordinated control method of a cooling-heating-power cogeneration system of a micro gas turbine. The method includes an off-line stage and an online stage. The off-line stage includes the first step that a controlled system is simplified; the second step that when an MGT-CCHP system is in a stable operation state, Gaussian white noise disturbance is added into all input variables in sequence, and data of input variables and output variables is collected to serve as data of model identification; the third step that according to data of disturbance experiments, a discrete state space model of a three-input three-output system is identified through a subspace identification method. The online stage includes the first step that the value of a state vector x(k) of a current moment k is observed; the second step that according to the state vector x(k) of the current moment k, an input vector u(k-1) of a k-1 moment and the identified state space model, an expression of output vectors of P moments in the future is deduced; the third step that performance indexes are optimized; the fourth step that by means of a secondary planning method, an optimization problem with the minimum optimization performance index is solved, and a control gain of the current moment is obtained.

Description

technical field [0001] The invention relates to an industrial control method, in particular to a coordinated control method for a micro gas turbine combined cooling, heating and power supply system based on a predictive control algorithm. Background technique [0002] Micro Gas Turbine Based Combined Cooling Heating and Power system (hereinafter referred to as MGT-CCHP system) is a representative form of distributed energy, which is composed of micro gas turbine, heating system and refrigeration system. The power system uses the heat generated by fuel combustion to generate electricity, and the waste heat of flue gas generated after power generation is sent to the heating system and refrigeration system to realize the utilization of waste heat. The energy conversion efficiency of traditional thermal power generation is about 30-35%, while the trigeneration system can reuse the waste heat of flue gas with low energy grade, and its average energy conversion efficiency can be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 朱明娟沈炯吴啸李益国张俊礼
Owner SOUTHEAST UNIV
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