RU2798413C2 - Method for checking protection of automatic control systems - Google Patents

Abstract

FIELD: automated process control systems.

SUBSTANCE: invention is used when performing protection checks of automatic control systems (ACS) of a gas compressor unit (GCU). Essence: in the ACS containing the controller, modules of input and output signals, using a configurator that connects the protection generation logic with the simulation logic, a protection check algorithm is implemented, in accordance with which in case of receiving a command to check the protection, the reading of signals from the input zone is disabled. At the same time, the ACS controller selects the simulation logic according to the number of the tested protection, in accordance with which it cocks or resets discrete input signals, increases or decreases analogue parameters to the values of protection operation.

EFFECT: automation of the process of checking the protection of GPU ACS.

1 cl, 7 dwg

Description

The invention relates to the field of automated process control systems and can be used when performing protection checks (hereinafter referred to as PZ) of automatic control systems (hereinafter referred to as ACS) of a gas compressor unit (hereinafter referred to as GCU) implemented on the basis of microprocessor control and management systems.

A typical block diagram of the main operating cycle of the ACS GPU controller is shown in Fig.1. At the beginning of the cycle, signals are read from the input zone of the device, warning and alarm signaling is generated based on the received state of the inputs, the main logic of the program is executed, such as: providing communication with external devices, generating control signals, determining modes, etc., after which the recording is performed signals to the output zone of the device - recording the state of the outputs. In the event of an alarm, the GPA ACS protection is activated, ensuring the ACS response to a disturbing effect, which results in an emergency shutdown of the gas compressor unit.

At the moment, in the existing algorithms of automated control systems for GPUs, protection checks [1] are performed by service personnel. There are known methods [2], in which the PZ is carried out: either with the help of auxiliary equipment [3, 4] connected to the ACS via terminal blocks, analog and discrete signals of the required level are supplied to the controller input, or the level of analog signals and the triggering of discrete signals by manually entering data into specialized software (hereinafter referred to as software).

The disadvantages of these methods are:

- high duration of the process of checking protection due to the fact that part of the technological stages have to be performed using manual labor;

- high probability of making mistakes by the personnel due to the lack of a clear sequence of steps to be performed;

- exact knowledge of the protection operation logic and protection operation level of each analog signal is required;

- decrease in the resource of equipment, cables and wires of the ACS due to frequent connections of external equipment to terminal blocks with temporary disconnection of sensor equipment from the device inputs.

The objective of the invention is to optimize the process of checking the protection of the automated control system of the gas compressor unit.

EFFECT: automation of the process of checking the protection of ACS GPU.

The problem is solved, and the technical result is achieved by developing an algorithm that implements software simulation of the signals necessary for the operation of the protection, in case of receiving a command to check the protection from the operating personnel.

The figure 2 shows a block diagram of the main program loop with the added subalgorithm "Automatic protection check". The figure 3 shows the sub-algorithm "Reading from the input zone". The figure 4 shows the interaction diagram of the main software modules of the subalgorithms "Formation of emergency and warning alarms" (hereinafter APS) and "Automatic check of protections". The figure 5 shows the sub-algorithm "Automatic verification of protections". The figure 6 shows the sub-algorithm "Formation of APS". The figure 7 shows the file configurator of the subalgorithms "Formation of APS" and "Automatic check of protections".

The method for checking protections is made in the form of a linear algorithm, which consists of sequentially performed stages, including a clear sequence of certain commands. In the ACS containing the controller, the modules of input and output signals implement this algorithm (figure 2), between the stage of reading signals from the input zone of the device and the stage of generating a warning and alarm based on the received state of the inputs. To ensure the functioning of the algorithm, additional changes are made to the existing subalgorithm "Reading from the input zone" (figure 3).

Variables introduced into the algorithm: flag_APZ - flag of the protection check mode, btn_APZ - variable fixing the pressing of the APZ button, by pressing which the ACS switches to the protection check mode, numPZ - a variable that determines the number of the current checked protection, countPZ - the number of all checked protections, timePZ - current protection check time, timersPZ[] - an array of dimension equal to countPZ, containing the times of each protection check.

The working main cycle of the controller (figure 2) ACS GPA is constantly running, the operating modes of the ACS are determined by the operator by pressing the software or physical buttons. If the ACS switches to the protection check mode, this mode is stored in the flag_APZ variable, while at the stage of reading signals from the input zone of the device, if the state of the variable is True (meaning that the ACS is in the PZ mode), the controller polls the states of the input zone of the device. (figure 3), which allows you to make changes to the variables associated with the inputs.

In the subalgorithm "Automatic check of protections" the values imitated by the program are written to the bound variables of the controller. The subalgorithm consists of two (figure 4) sequentially executed program modules: a functional block for the formation of auxiliary variables and a signal simulation function. When switching in the controller cycle to the subalgorithm "Automatic check of protections" (figure 5), in the first module, the auxiliary logic of the subalgorithm starts to be executed, which starts with checking the current ACS mode: if the mode is PZ, control is transferred to the operating personnel, who, by pressing the button APZ performs sequential switching of the number of the protection being checked (increases the value of the numPZ variable). If the protection number of the total number of protections is exceeded, the subalgorithm is prematurely exited with the numPZ variable reset to zero. At the next stage of the execution of the first module, the protection check execution time is compared (variable timePZ) and if the protection check time exceeds that set for this protection (timePZ>timersPZ[numPZ]), the subalgorithm "Automatic protection check" is exited, if it does not exceed then the variable timePZ is increased by a value equal to the time of a single execution of the main work cycle. The ACS controller, having the current number of the tested protection in the second module, selects the simulation logic according to the number of the tested protection, according to which it cocks or resets discrete input signals, increases or decreases analog parameters according to the proposed formulas: - Increase (in symbolic representation):

, Where:

Anpar.Tg_inD - measured parameter;

Anpar.Pg_outN_hilimit - upper limit of the measured parameter range;

Anpar.Pg_outN_lolimit - lower limit of the measured parameter range;

timersPZ[numPZ] - array element containing the time of the measured parameter protection check;

numPZ - number of protection being checked;

timePZ - current time (timer) of the checked protection.

- Decrease (in symbolic representation):

, Where:

Anpar.Tg_inD - measured parameter;

Anpar.Tg_inD_hilimit - upper limit of the measured parameter range;

Anpar.Tg_inD_lolimit - lower limit of the measured parameter range;

timersPZ[numPZ] - array element containing the time of the measured parameter protection check;

numPZ - number of protection being checked;

timePZ - current time (timer) of the checked protection.

The stage of generating emergency and warning alarms in the ACS software is represented by the sub-algorithm "Formation of APS" (Fig.6). At this stage, in accordance with the conditions for the operation of protections, an alarm is generated, which is used later to execute the logic describing the reaction of the ACS. In this case, the conditions use blocked variables tied to the controller outputs, which are programmed to the values of the protection operation.

To reduce the likelihood of errors when coding the logic of the subalgorithms "Automatic check of protections" and "Formation of the APS", a configurator is used (Fig. 7), which generates the program code of the modules of the subalgorithms using a tabular representation of the protection trigger condition:

So for the subalgorithm "Formation of APS" the program code will be generated:

For the subalgorithm "Automatic check of protections" the program code will be generated:

In this case, the conditions are programmatically linked to the logic of signal simulation. The generated program code is added to the general executable program of the controller immediately before the compilation stage.

Bibliography:

1. Kozachenko A.N. Operation of compressor stations of main gas pipelines / Kozachenko A.N. - M.: Oil and gas, 1999. - 463 p. ISBN 5-7246-0055-2.

2. Guidelines for the operation of technological protection, made on the basis of microprocessor technology. RD 153-34.1-35.142-00 - Approved. Department of Development Strategy and Scientific and Technical Policy of RAO "UES of Russia" 13.06.2000

3. Pat. 1566302 USSR, IPC G01R 27/00. Shop of resistance / Bulyga S.G., Mikiychuk N.N., Patsarnyuk Ya.V., Shmorgun E.I.: Applicant and patentee Lviv Polytechnic Institute. Lenin Komsomol. - No. 4331657/24-09; dec. 11/20/1987; publ. 05/23/1990, Bull. No. 23. - 3 s: ill.

4. Pat. 2345377 RF, IPC G01R 35/00. Automatic calibrator of measures of the measuring and computing complex / Bodrov V.E., Krayachich A.V., Galaktionova A.A., Podboronov B.P., Svirsky Yu.A. N.E. Zhukovsky" (FSUE "TsAGI"). No. 2007129375/28; dec. 07/31/2007; publ. 27.01.2009, Bull. No. 23. - 3 p.: ill.

Claims (1)

A method for checking the protection of an automated control system of a gas compressor unit (GCU), characterized in that an automatic control system (ACS) containing a controller, input and output signal modules is introduced using a configurator that connects the protection generation logic with the simulation logic, a protection verification algorithm, consisting in the fact that in case of receiving a command to check the protection, the reading of signals from the input zone is disabled, and the ACS controller selects the simulation logic according to the number of the protection being checked, in accordance with which it cocks or resets discrete input signals, increases or decreases analog parameters to the values of protection operation .

Images