Continuous adjustable control method for power generating quantity of low-temperature power generator set

Abstract

The invention belongs to the technical field of power generation, and relates to a continuous adjustable control method for power generating quantity of a low-temperature power generator set. According to the method, whether the power generation of the low-temperature power generator set realizes the same frequency and the same phase as an electricity network or not is judged according to the collected power generating frequency and the power generating phase, if the judging result shows that the same frequency and the same phase are not realized, the operation frequency of a work medium pump is regulated according to the set frequency step length, and the operation turns to the control of the normal grid connection operation until the grid connection success is judged: the feedback power generating quantity is compared with the preset power setting point and the return difference, when the power generating quantity is greater than the sum of the power setting point and the return difference, a frequency converter is controlled so that the rotating speed of the work medium pump is reduced, and further, the flow rate is reduced; when the power generating quantity is smaller than the difference of the power setting point and the return difference, the frequency converter is controlled so that the rotating speed of the work medium pump is increased, and further, the flow rate is increased; and when the power generating quantity is just in the normal range of the return difference and the user setting point, the current rotating speed is maintained unchanged. The continuous adjustable control method has the advantages that the fluctuation generated by loads at the heat source side can be adapted, and the reliable operation of the power generator set can be ensured.

Description

Technical field [0001] The invention belongs to the technical field of power generation, and relates to a control method for a low-temperature waste heat generating set. Background technique [0002] The low-temperature waste heat generator set utilizes the principle of the organic Rankine cycle, which on the one hand solves the problem of industrial waste heat recovery and utilization, on the other hand improves energy utilization efficiency, reduces air pollution, and has great economic and social benefits. figure 1 It is a typical operating process of a low-temperature waste heat generator set: the working medium of the generating set is sent to the evaporator for evaporation under the action of the working medium pump, and the evaporated gaseous working medium expands at the expander to drive the generator to generate electricity , the working fluid after expansion is sent to the condenser to cool down, and then returns to the working fluid pump for pressurization. The e...

AI Technical Summary

Problems solved by technology

At present, low-temperature waste heat generating units still have technical problems in adapting to changes in heat source load: if the heat source load fluctuates greatly, the power generation of the generating set will also fluctuate greatly, which will affect the operation of the entire power generation system or even cause shutdown ACCIDENT

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