SU914779A1 - Power unit control method - Google Patents

Description

The invention relates to heat engineering hetics and can be used on block thermal power plants, involved in the regulation of frequency and power flows in power systems.

There are known methods for controlling the power of a power unit by varying the power of the steam generator and the turbine unit: Gata in accordance with the planned and unplanned components of the task and with the actual power of the power unit o /.

However, the quality of the processes is not high enough due to the resonant properties of the closed control loop.

The closest to the invention to the technical essence is a method of controlling the power of a power unit by changing the power of the steam generator in accordance with the planned and unplanned components of the task, changing the power of the turbine unit in accordance with the change in power

ten

2

the steam generator and the rate of change of the unplanned component of the task and <control of the actual power of the power unit [2].

The disadvantage of this method should be considered to reduce the accuracy of the development of the planned component of the job due to the influence of significant non-linearity of the statistical characteristics of the elements of the unit.

The purpose of the invention is to improve the accuracy of the development of the planned component of the task.

To achieve the goal, a signal of an unplanned component of actual power is formed by converting an unplanned component of a task in a power unit model, a signal of a planned component of actual power is obtained by subtracting the generated signal from the actual power of a unit, the error of the received signal is determined from the planned component of the task,

four

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This discrepancy with the introduction of the integral component and the resulting signal by the signal additionally changes the power of the steam generator. five

Such a sequence of technological operations allows for an open-loop power control system of the power unit.

The drawing is a diagram of the implementation of U method.

The scheme consists of a forcing unit 1, a steam generator 2 with a system for controlling its load and a turbine unit 3 with a system for controlling the position of the turbine valves, and with a steam pressure regulator “to yourself” unit.

4 transformations (power unit model), units 5 and 6 of comparison, astatic controller 7. '20

The load control system of the steam generator 2 receives signals as the reference equivalent planned M _PA and neplanovoyM _H nq integral job. ^^ formed with allowance> 25 is frequency deviation.

The actual capacity of the power unit is generated by the turbo-unit 3 in accordance with the power of the steam generator: Ν ^> = Ν ^ ,. thirty

- At the same time, the steam pressure regulator "to itself", acting on the control valves of the turbine unit, maintains the vapor pressure in front of the turbine unit at a given level. Forcing unit 1 allows forming a forcing effect Hf / s when N changes. to control valves of the turbine unit, in order to ensure the required quality of the transition process required to regulate the parameters of the power system mode.

Bytes unit 4 is realized unit dynamic model which can be displayed ₄₅ zhayuschaya its response to unplanned change in delivering a predetermined power ΝφΗΠΛ ·

The actual capacity of the power unit with the help of special measures vyde- ⁵⁰ lyayutsya its components: planned and unplanned ΝφηΛ 'C ^ _P to ⁼

⁺ ΝμηΛ ·

The value of ΝφΗ _ηΛ with some error is calculated using the block 4: 55

 ΝφιΦΛ Νφ efficiency.

The value determined in block 5: №fpl = 'ΝςΟΗΐυν ^»a v ^{a w} ~

balancing in the maintenance of DP - in block ^6: ΔΝ „= Ν -M

ΠΛ Λ Srpl *:

Using an astatic controller 7, an integral component is introduced into this mismatch, which allows the mismatch to be reduced to zero in the control process.

The regulator 7 is slow, corrective. Therefore, the system for the unplanned component is open, and the dpya planned component is closed.

At the same time, the peak of the amplitude-frequency characteristic of the planned delivery power shifts to the low frequency range and does not coincide with the frequency range of disturbing influences along an unplanned power component.

A possible static error in the calculation of the IFNPL in block C does not have a significant effect on the accuracy of maintaining MPL, since the absolute value of N sludge overwhelming system operation time is significantly less ·

Thus, the proposed control method provides:

- working out by the power unit of control actions section? but through the channels of planned and unplanned components; given power with independent dynamic characteristics for each channel;

- maintaining, with the required accuracy, the planned component of the power unit;

- satisfactory frequency characteristics of the power unit parameters in a wide range of frequencies of the control action of Alla, while maintaining the required high dynamic qualities of working through this channel;

- ease of setting up a control system at the facility.

Claims (1)

Claim The method of controlling the power of a power unit by changing the power of the steam generator in accordance with the planned and unplanned components of the task, changing the power of the turbine unit in accordance with the change in power of the steam generator and the rate of change of the unplanned composition5 914779 6 task and control of the actual capacity of the power unit, characterized in that, in order to improve the accuracy of the planned component of the task, a 5 unplanned signal is generated. component of the actual power by converting the unplanned component of the task in the model of the power unit, receive the signal of the planned component of the actual power by subtracting the generated signal from the actual power of the unit, determine the error of the received signal with the planned component of the task, convert this error with the introduction of the integral component and the resulting signal additionally change the power of the steam generator.