Primary frequency modulation testing method, device and system of gas and steam combined cycle unit

Abstract

The invention provides a primary frequency modulation testing method, device and system of a gas and steam combined cycle unit. The method includes acquiring load commands of a gas turbine, setting diversity factor of an initial target revolving speed of the combined cycle unit; acquiring load to be adjusted in each turn of the gas turbine according to the diversity factor of the initial target revolving speed, the rated loads of the gas turbine and a steam engine; acquiring target setting values of diversity factor of the revolving speed according to the rated load of the gas turbine and the load to be adjusted in each turn of the gas turbine; applying a disturbance signal to the gas turbine; finely adjusting the target setting value of the diversity factor of the revolving speed of the gas turbine up and down so as to enable the diversity factor of the revolving speed of the combined cycle unit to meet the standard range. Expected load response loop of the steam engine is added to a frequency modulation load command loop of the gas turbine, so that reverse action of the load of the gas turbine is prevented. The primary frequency modulation testing method can optimize and adjust control parameters in real time, reverse action of the load of the gas turbine is avoided, and system is more stable and safer.

Description

technical field [0001] The invention relates to power generation technology, in particular to a primary frequency regulation test of a combined cycle unit, specifically a method, device and system for a primary frequency regulation test of a gas-steam combined cycle unit. Background technique [0002] In recent years, with the increase of load and the increase of grid scale, a new situation of interconnection between UHV power grid and regional power grid has emerged. Under this new situation, higher requirements are put forward for the power grid to improve the ability to resist shock and nonlinear load. [0003] Frequency is one of the important indicators for evaluating power quality. If the frequency exceeds the allowable range, it will affect the safety and economic benefits of the power system, generator sets and users. More serious fluctuations will cause serious impact on the power grid and even cause the power grid to collapse. Among the functions, the primary frequ...

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Problems solved by technology

[0006] The invention provides a primary frequency modulation test method, device and system of a gas-steam combined cycle unit. 0 %Meets the latest "Guidelines for Primary Frequency Regulation Test of Thermal Power Generating Units of State Grid Corporation" inversely calculates the amount of load ΔP that needs to be adjusted per revolution of the gas turbine 0 , and then obtain the target setting value δ% of the gas turbine speed unequal rate, without disconnecting the actual grid frequency, conduct a frequency modulation experiment under the premise that the actual slip is less than a certain safety threshold, increase the actual grid frequency monitoring, and solve the existing one In the frequency modulation experiment, it is easy to have the problems of reverse adjustment of gas turbine power, failure to monitor the actual network frequency, and low accuracy

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