CN111579987A - Large-frequency-difference remote disturbance testing system for thermal generator set - Google Patents
Large-frequency-difference remote disturbance testing system for thermal generator set Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a large-frequency-difference remote disturbance testing system for a thermal generator set, which comprises a local control system and a telemechanical system, wherein the local control system and the telemechanical system adopt a layered structure; the telecontrol system is used for formulating a control strategy through fixed input equipment or an automatic control system and sending the generated disturbance frequency difference value to the local control system; the local control is used for executing a control strategy of the motion system, and comprises the following steps: when the unit does not send RB and the rotating speed has no fault, after the normal operation of the unit is confirmed, a remote adjusting signal is received to adjust the active power of the unit, so that the adjusting action of the unit in the testing period is not influenced by the AGC instruction. The invention can carry out remote dynamic test and verify the integral function of the primary frequency modulation performance on-line system.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a large-frequency-difference remote disturbance testing system for a thermal generator set.
Background
The primary frequency modulation performance of the unit in the power grid control area directly determines the rapid adjustment capability of the power grid under the condition of sudden increase or sudden decrease of frequency, so that the testing and evaluation of the primary frequency modulation performance of the unit are necessary to master the primary frequency modulation performance of the power grid under the constantly changing load requirements during the operation of the power grid.
In order to verify the function of the online test system for the primary frequency modulation performance of the power grid thermal power generating unit, remote dynamic tests are required to be carried out, the overall function of the online system for the primary frequency modulation performance is verified, the performance and parameter configuration of the primary frequency modulation of the unit meet various specified requirements, and meanwhile, the overall stability of the unit participating in the operation of remote primary frequency modulation is verified, so that the power grid can have better primary frequency modulation performance under the continuously changing load requirements.
The existing primary frequency modulation test can only be carried out on the machine set side, and the regulation performance of large frequency difference cannot be effectively controlled.
Disclosure of Invention
The invention aims to provide a thermal generator set large-frequency-difference remote disturbance testing system which can test the primary frequency modulation performance of a power grid aiming at a power generation side at any time, avoids the limitation on time and place and really realizes remote disturbance testing.
The invention provides a large-frequency-difference remote disturbance testing system for a thermal generator set, which comprises a local control system and a telemechanical system, wherein the local control system and the telemechanical system adopt a layered structure;
the telecontrol system is used for formulating a control strategy through fixed input equipment or an automatic control system and sending the generated disturbance frequency difference value to the local control system;
the local control is used for executing a control strategy of the motion system, and comprises the following steps: when the unit does not send RB and the rotating speed has no fault, after the normal operation of the unit is confirmed, a remote adjusting signal is received to adjust the active power of the unit, so that the adjusting action of the unit in the testing period is not influenced by the AGC instruction.
Further, the working method of the system is as follows:
sending a unit primary frequency modulation test input/exit signal by a dispatching side in a remote control mode, and switching the unit primary frequency modulation function to a test mode when the signal is in a closed position, so that the primary frequency modulation function does not respond to the change of the actual power grid cycle any more; when the signal is in a position division manner, switching the primary frequency modulation function of the unit to a normal mode, and putting the primary frequency modulation function into actual operation again;
sending a unit primary frequency modulation test disturbance frequency signal by a dispatching side, receiving a unit primary frequency modulation test disturbance frequency feedback value, verifying whether communication is normal or not, and judging the size of a remote regulation error.
By means of the scheme, the thermal generator set large-frequency-difference remote disturbance test system can be used for carrying out remote dynamic tests and verifying the overall function of the primary frequency modulation performance online system.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the operation of a large frequency difference remote disturbance testing system of a thermal generator set according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the thermal generator set large frequency difference remote disturbance testing system provided in this embodiment adopts a layered structure of a local control system and a telemechanical system, where the telemechanical system is a maker of a control strategy, and the control strategy may be made by a fixed input device, such as a computer or an automatic control system. The remote control system generates a disturbed frequency difference value and then sends the disturbed frequency difference value to the local control system, the local control system is a strategy executor, and when the unit does not send RB (rapid load reduction) and the rotating speed does not have faults, the local control system receives a remote control signal to adjust the active power of the unit after confirming that the unit normally operates. The adjusting action of the unit during the test is not influenced by the AGC command (the dispatching side switches the AGC command into a MANU mode during the test). When the signal is 'position division', the power plant switches the primary frequency modulation function of the unit to a normal mode, and the primary frequency modulation function of the power plant is put into actual operation again.
The use method of the large-frequency-difference remote disturbance control system of the thermal generator set comprises the following steps:
the unit primary frequency modulation test input/exit signal is sent out by the dispatching side in a remote control mode and is a switching value signal. When the signal is 'closed', the power plant switches the primary frequency modulation function of the unit to a test mode. The primary frequency modulation function of the power plant does not respond to the change of the actual power grid cycle. The adjusting action of the unit during the test is not influenced by the AGC command (the dispatching side switches the AGC command into a MANU mode during the test). When the signal is 'position division', the power plant switches the primary frequency modulation function of the unit to a normal mode, and the primary frequency modulation function of the power plant is put into actual operation again.
A disturbance frequency signal of a unit primary frequency modulation test is sent out by a dispatching side, the signal is an analog quantity signal, and default parameters are [49.6,50.4] Hz. The signal is amplified by 1000 times by default and is issued, and the range of the unit end can be set to 49600 and 50400. And the unit primary frequency modulation test permission state is a state feedback value reflecting whether the unit on the power plant side has the primary frequency modulation test capability, and the unit returns to 1 if the test is permitted and returns to 0 if the test is not permitted.
The unit primary frequency modulation test disturbance frequency feedback value is a received disturbance frequency value returned by a power plant after the power plant receives a remote regulation 'unit primary frequency modulation test disturbance frequency' signal issued by a power grid, and is used for verifying that communication is normal at a dispatching side and judging the size of a remote regulation error. The unit primary frequency modulation test load instruction is an analog quantity signal and is a load instruction response (including a unit total load instruction with primary frequency modulation increment) generated by the unit to the current disturbance frequency difference. The amplitude precision of the disturbance frequency signal (amplified by 1000 times) at the power plant side should be less than 0.625% (if the amplitude of the signal received and fed back by the unit is within 50400 +/-5 when the network modulation sends 50400), the synchronism of all signals is ensured, and the time delay of signal transmission is required to be less than 3 seconds.
The DEH side primary frequency modulation loop and the CCS side primary frequency modulation loop are designed in a unit control logic. The primary frequency modulation function at the DEH side is a main means for the unit to quickly respond to frequency change, and the action characteristic of small delay determines that the load response is quick and direct; the closed-loop regulation of the primary frequency modulation at the CCS side makes up the defect of the pure proportion difference regulation at the DEH side, so that the frequency modulation output of the unit is accurately controlled, the output of the CCS side frequency difference correction loop is superposed on the actual load instruction of the unit, namely the output of the frequency difference correction loop is consistent with the actual load change demand when the frequency changes. And the output of the DEH side frequency difference correction loop is superposed on the flow instruction of the steam turbine throttle valve to form a final flow instruction, and the opening of the throttle valve is determined by a valve management program.
Before static test, power grid dispatching and equipment manufacturer science and technology staff complete configuration parameter check of information point tables such as remote regulation and remote control of a power grid dispatching master station side, a unit side completes design (including interface signals, channel design, control logic design and control parameter setting), signal laying and logic configuration work of an overall control scheme of a unit primary frequency modulation remote test system according to requirements, and power grid dispatching completes open-loop signal static joint debugging test. In the open loop test process, the unit side and the power grid dispatching automation master station device check information in a design point table and confirm that the information meets requirements, and a unit side test responsible person records test data.
In a specific embodiment, based on a test interaction mechanism of a scheduling side and a power plant side, a master station (a network modulation side) issues a set primary frequency modulation test input, exit and various types of test instructions in a remote control instruction issuing mode, and a substation (the set side) simulates the system primary frequency modulation action condition after receiving the corresponding instructions, performs online test on the primary frequency modulation dynamic performance, and analyzes and evaluates the set primary frequency modulation performance.
The interactive data of the dispatching side and the power plant are shown in the table 1 and the table 2.
(1) Control center → electric power plant
TABLE 1 Regulation center to Power plant communication signals
(2) Power plant → control center
TABLE 2 plant to control center contact signals
In order to verify the maximum frequency modulation capacity of the unit, 75% Pe load points of the unit are selected for testing, the tests under the conditions of slip +/-4 rpm (+ -0.067 Hz), +/-6 rpm (+ -0.1 Hz) and +/-9 rpm (+/-0.15 Hz) are respectively carried out, after the test is finished, the test is quitted, the test is strictly carried out according to the test steps, and after the test is finished, the guardian confirms that the normal operation is recovered again. During a maximum frequency difference test, the load fluctuation is large, the main parameter fluctuation is easy to cause, the steam drum water level change condition needs to be noticed during the test, the water supply flow low-pump-tripping condition caused by large water supply flow change needs to be noticed, the test starts to strictly notice the water supply system parameter change, and manual intervention is performed in time.
During the test, no signal is forced, the operator strictly monitors whether the steam turbine regulating valve has obvious shaking condition, if so, the steam turbine is switched to manual operation and stops the test immediately, and during the test, the operator strictly monitors parameters which may endanger the safety of the unit, such as main steam pressure, main steam temperature, steam drum water level, shafting parameters and the like, if so, the operator immediately stops the test and switches to manual operation, completely and accurately records the test result, and carries out sorting calculation to evaluate the regulating effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A thermal generator set large-frequency-difference remote disturbance testing system is characterized by comprising a local control system and a telemechanical system, wherein the local control system and the telemechanical system adopt a layered structure;
the telecontrol system is used for formulating a control strategy through fixed input equipment or an automatic control system and sending the generated disturbance frequency difference value to the local control system;
the local control is used for executing a control strategy of the motion system, and comprises the following steps: when the unit does not send RB and the rotating speed has no fault, after the normal operation of the unit is confirmed, a remote adjusting signal is received to adjust the active power of the unit, so that the adjusting action of the unit in the testing period is not influenced by the AGC instruction.
2. The thermal generator set large frequency difference remote disturbance testing system of claim 1, characterized in that the working method of the system is as follows:
sending a unit primary frequency modulation test input/exit signal by a dispatching side in a remote control mode, and switching the unit primary frequency modulation function to a test mode when the signal is in a closed position, so that the primary frequency modulation function does not respond to the change of the actual power grid cycle any more; when the signal is in a position division manner, switching the primary frequency modulation function of the unit to a normal mode, and putting the primary frequency modulation function into actual operation again;
sending a unit primary frequency modulation test disturbance frequency signal by a dispatching side, receiving a unit primary frequency modulation test disturbance frequency feedback value, verifying whether communication is normal or not, and judging the size of a remote regulation error.
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| CN202010236106.7A CN111579987A (en) | 2020-03-30 | 2020-03-30 | Large-frequency-difference remote disturbance testing system for thermal generator set |
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| CN202010236106.7A CN111579987A (en) | 2020-03-30 | 2020-03-30 | Large-frequency-difference remote disturbance testing system for thermal generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300420A (en) * | 2021-07-02 | 2021-08-24 | 华北电力科学研究院有限责任公司 | Remote primary frequency modulation test method and device |
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| WO2013083850A2 (en) * | 2011-12-08 | 2013-06-13 | GL Garrad Hassan Deutschland GmbH | Test device for carrying out functional tests on energy producers |
| CN106532746A (en) * | 2016-12-27 | 2017-03-22 | 北京四方继保自动化股份有限公司 | Control system for participation of wind power plant in primary frequency modulation and implementation method |
| CN107976592A (en) * | 2017-10-25 | 2018-05-01 | 国电南瑞科技股份有限公司 | Unit primary frequency modulation on-line testing method based on wide area measurement information |
| CN208580186U (en) * | 2018-06-12 | 2019-03-05 | 华润电力（温州）有限公司 | A kind of test macro and generating set of primary frequency modulation performance |
| CN109861242A (en) * | 2017-11-30 | 2019-06-07 | 中国电力科学研究院有限公司 | A kind of wind-powered electricity generation participates in the power coordination control method and system of primary frequency regulation of power network |
-
2020
- 2020-03-30 CN CN202010236106.7A patent/CN111579987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013083850A2 (en) * | 2011-12-08 | 2013-06-13 | GL Garrad Hassan Deutschland GmbH | Test device for carrying out functional tests on energy producers |
| CN106532746A (en) * | 2016-12-27 | 2017-03-22 | 北京四方继保自动化股份有限公司 | Control system for participation of wind power plant in primary frequency modulation and implementation method |
| CN107976592A (en) * | 2017-10-25 | 2018-05-01 | 国电南瑞科技股份有限公司 | Unit primary frequency modulation on-line testing method based on wide area measurement information |
| CN109861242A (en) * | 2017-11-30 | 2019-06-07 | 中国电力科学研究院有限公司 | A kind of wind-powered electricity generation participates in the power coordination control method and system of primary frequency regulation of power network |
| CN208580186U (en) * | 2018-06-12 | 2019-03-05 | 华润电力（温州）有限公司 | A kind of test macro and generating set of primary frequency modulation performance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113300420A (en) * | 2021-07-02 | 2021-08-24 | 华北电力科学研究院有限责任公司 | Remote primary frequency modulation test method and device |
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Application publication date: 20200825 |