Thermoelectricity cogeneration unit fast variable load control method based on thermoelectric load conversion model

A technology for cogeneration units and load conversion, applied in mechanical equipment, steam engine installations, combined combustion mitigation, etc., can solve problems such as difficulty in achieving automatic power generation control in the power grid, improve load response rate, ensure heat supply quality, and improve stability. sexual effect

Active Publication Date: 2018-10-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

For cogeneration units that take into account both power generation and heat supply, the control strategy is more conservative when operating in the heat-constant power mode, and the load changing rate generally does not exceed

Method used

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  • Thermoelectricity cogeneration unit fast variable load control method based on thermoelectric load conversion model
  • Thermoelectricity cogeneration unit fast variable load control method based on thermoelectric load conversion model
  • Thermoelectricity cogeneration unit fast variable load control method based on thermoelectric load conversion model

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Embodiment

[0030] Taking a 330MW cogeneration unit as an example, the characteristic model of the influence of the change of heating and extraction steam flow rate on the unit load change is described by the first-order inertial link:

[0031]

[0032] In the formula, ΔN is the unit load variation; ΔD h is the variation of heating and extraction steam; K is the proportional gain, which can be calculated by using the static characteristics of thermoelectric coupling to calculate the difference before and after the output power caused by the increase of heating and extraction steam flow, and its ratio is the proportional gain K. For example, a 330MW unit provides Under the TMCR working condition, the power generation output of the units with heat supply and extraction of 0 and 300t / h are respectively 348.48MW and 306.93MW. At this time, the proportional gain K of the unit can be directly obtained = (306.93—348.48) / (300 —0)=—0.1385, this value is slightly different under different loads,...

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Abstract

The invention discloses a thermoelectricity cogeneration unit fast variable load control method based on a thermoelectric load conversion model, and belongs to the technical field of thermal power generating unit variable load control. The method is a control strategy combining heat supply and steam extraction adjustment with a traditional coordination control strategy, the load change in a varying duty early stage is mainly borne by the heat supply and steam extraction flow adjustment, the heat supply extraction flow begins to be reversely adjusted until an initial value is restored along with the gradual development of the adjusting action of a fuel amount; at a variable load control last stage, the control effect of the heat supply extraction flow adjustment on the load gradually disappears, and the load change is completely adjusted by the fuel amount; and through the combination with the heat supply and steam extraction heat storage adjustment and the machine furnace coordination,the response time of the system from the initial stage, the response speed of an intermediate transition stage and the adjustment precision of the final stabilization stage are both improved and optimized. According to the method, the operation safety of the unit can be ensured, the variable load characteristic of the unit can be improved, and the method plays an important role in access of a novel energy source and the improvement of the stability of a power grid.

Description

technical field [0001] The invention belongs to the technical field of variable load control of thermal power units, and in particular relates to a fast variable load control method for heat and power cogeneration units based on a thermoelectric load conversion model. Background technique [0002] In order to ensure the safe and stable operation of the power system, grid-connected generating units need to maintain the stability of grid frequency and the balance between supply and demand of grid energy at all times. Therefore, the generators need to continuously respond to the load command of the grid to meet the requirements of primary frequency regulation of the grid. In order to encourage units to quickly respond to grid dispatching requirements, my country's power grid companies have successively issued assessment rules to assess and reward and punish directly-regulated generator sets. Improving the variable load performance of units has become an important factor related ...

Claims

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Application Information

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IPC IPC(8): F01K13/02F01K17/02
CPCF01K13/02F01K17/02Y02E20/14
Inventor 王玮曾德良刘吉臻田亮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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