CN110318826B - Load shedding control system of bypass system of thermal power generating unit in isolated grid mode - Google Patents
Load shedding control system of bypass system of thermal power generating unit in isolated grid mode Download PDFInfo
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- CN110318826B CN110318826B CN201910590343.0A CN201910590343A CN110318826B CN 110318826 B CN110318826 B CN 110318826B CN 201910590343 A CN201910590343 A CN 201910590343A CN 110318826 B CN110318826 B CN 110318826B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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Abstract
The invention provides a load shedding control system of a bypass system of a thermal power generating unit in an isolated grid mode, which comprises the following components: the control mode conversion module, the override feedforward calculation module and the steam parameter control module are connected with the control module; the control mode conversion module is used for monitoring a load shedding signal in real time, judging a full load shedding working condition and a partial load shedding working condition and generating conversion instructions, wherein the conversion instructions comprise a quick opening instruction, a manual automatic switching instruction and a steam parameter setting instruction; the override feedforward calculation module is used for calculating the override quick opening amount and the adjustment feedforward amount of each adjustment loop of the bypass according to the full load throwing working condition and the partial load throwing working condition; and the steam parameter control module is used for controlling according to the acquired conversion instruction, the override quick opening amount and the adjustment feed-forward amount. The method solves the problem of quick response of load shedding control of the thermal power generating unit bypass system in an isolated grid mode, and improves the steam parameter control quality.
Description
Technical Field
The invention relates to the technical field of thermal power unit control, in particular to a load shedding control system of a bypass system of a thermal power unit in an isolated grid mode.
Background
In the grid-connected operation of the thermal power generating unit, if the steam turbine, the generator or the power grid side has a fault and causes load shedding, in order to quickly recover power transmission after the fault is eliminated and avoid economic loss caused by unit shutdown, the boiler is adopted to quickly reduce output, the bypass system is quickly started and steam parameters are maintained to stably operate, so that the grid-connected load is quickly carried out after the fault is eliminated. The load shedding control method is set Fast cut load protection (FCB), and comprises three working conditions: tripping of the steam turbine, operation of the steam turbine with service electricity and idling of the steam turbine.
In an isolated network, a thermal power generating unit is in a frequency control mode without controlling load, when load shedding occurs at the downstream, the frequency rises, the system can reduce the output of the thermal power generating unit according to the rising of the frequency and a throttle command until the balance between power generation and power utilization is reestablished, and the frequency is recovered to a rated value. When a large-amplitude frequency modulation demand occurs, the stability control system sends a quick load unloading command to the unit according to different working conditions, and the load is reduced by 10 to 100 percent, which is called as frequency modulation quick load unloading; when the frequency is too high, the thermal power generating unit running on the grid respectively executes Overspeed Protection Control (OPC) to quickly close the speed regulation air valve according to different fixed values, and when the frequency is gradually recovered, the OPC also respectively resets according to different fixed values so as to quickly stabilize the frequency. Both conditions require the bypass system to be turned on quickly and maintain stable steam parameters.
The load shedding can be divided into full load shedding and partial load shedding, the fuel quantity, the air quantity and the water supply quantity are adjusted to reasonable levels at a certain rate at the boiler side according to requirements, the steam turbine side needs to complete the rapid switching of a steam channel and ensure the rapid stability of main and reheat steam parameters, otherwise, the continuous oscillation and even tripping of unit control are easily caused. Particularly, the isolated network running unit may generate frequency modulation quick load shedding continuously for many times, and if the former quick load shedding is not stable, the latter quick load shedding has no stable parameter for reference, thereby having adverse effects on the reliability and stability of bypass control.
Therefore, how to solve the quick response of the bypass system to the load shedding, ensure the safe and stable operation of the unit in the load shedding process and overcome the adverse effect is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a thermal power generating unit bypass system load shedding control system in an isolated network mode, so as to meet the requirement of quick response of the thermal power generating unit in the isolated network mode for load shedding control, ensure that the thermal power generating unit can safely and stably run in the processes of steam turbine tripping, generator disconnection, OPC action and frequency modulation quick load shedding, and improve steam parameter control quality.
In order to achieve the technical purpose, the invention provides a thermal power generating unit bypass system load shedding control system in an isolated grid mode, which is applied to the thermal power generating unit bypass control system in the isolated grid, and comprises the following components: control mode conversion module, override feedforward calculation module, steam parameter control module, wherein, control mode conversion module: the system comprises a load shedding signal processor, a controller and a controller, wherein the load shedding signal processor is used for judging a full load shedding working condition and a partial load shedding working condition according to the load shedding signal monitored in real time and generating conversion instructions, and the conversion instructions comprise a quick opening instruction, a manual-automatic switching instruction and a steam parameter setting instruction;
an override feedforward calculation module: the bypass temperature control system is used for calculating the override quick opening and the adjustment feedforward quantity of each bypass adjusting loop, specifically, calculating the override quick opening and the adjustment feedforward quantity of a selected high bypass pressure adjusting loop according to the full load throwing working condition and the part load throwing working condition, calculating the override quick opening and the adjustment feedforward quantity of the high bypass temperature adjusting loop according to a high bypass steam flow instruction, calculating the override quick opening and the adjustment feedforward quantity of a low bypass pressure adjusting loop according to the high bypass steam flow instruction, and calculating the override quick opening and the adjustment feedforward quantity of the low bypass temperature adjusting loop according to the low bypass steam flow instruction;
the steam parameter control module: and the control is carried out according to the acquired conversion instruction, the override quick-opening amount and the adjustment feed-forward amount.
Preferably, the determination conditions of the full load rejection working condition are as follows: any action of the steam turbine tripping, the generator splitting and the OPC action is established, one action, two actions and three actions are generated in the three actions, the judgment conditions of the full load shedding working condition are established, and the judgment conditions of the partial load shedding working condition are as follows: frequency modulation quick load shedding;
generating a full load shedding quick-opening request when the full load shedding working condition is met, generating a partial load shedding quick-opening request when the partial load shedding working condition is met, and generating a bypass quick-opening instruction when the full load shedding quick-opening request or the partial load shedding quick-opening request occurs and a bypass has no strong-closing condition;
the manual-automatic switching instruction comprises the steps of immediately executing the quick opening action and switching all the regulating circuits to the manual mode after the quick opening instruction is generated, and switching back to the automatic mode after the quick opening action is executed;
the steam parameter setting instruction comprises the switching of a main reheating steam pressure setting value and a high and low bypass valve rear temperature setting value; and after the quick opening action is executed, switching the main steam pressure set value, the high side valve rear temperature set value and the low side valve rear temperature set value into actual values before the quick opening action, switching the reheating steam pressure set value into the unit rush rotating pressure when throwing the full load, and switching the reheating steam pressure set value into the actual values before the quick opening action when throwing the partial load.
Preferably, the override quick opening of the high bypass pressure regulating circuit is converted by a characteristic curve of the high bypass pressure regulating valve according to the high bypass steam flow demand; when the load is thrown under the full load working condition, the main steam flow before the load is thrown is used as a high side steam flow demand, and when the load is thrown under the partial load working condition, the sum of the high side steam flow increment and the high side steam flow instruction before the load is thrown is used as the high side steam flow demand; the feed forward quantity of the high bypass pressure regulating loop is a high bypass steam flow increment;
the main steam flow is the sum of the steam inlet amount of a high-pressure cylinder of the steam turbine and the high bypass steam flow, the high bypass steam flow is obtained through the opening feedback of a high bypass pressure regulating valve and the calculation of the temperature and the pressure of main steam, the high bypass steam flow instruction is obtained through the opening instruction of the high bypass pressure regulating valve and the calculation of the temperature and the pressure of the main steam, and the high bypass steam flow increment is the product of the power difference of the unit before and after the load shedding part and the designed steam power ratio.
Preferably, the feed-forward quantity of the high-side temperature-reducing regulating loop is the flow demand quantity of the high-side temperature-reducing water, and the override quick opening quantity of the high-side temperature-reducing regulating loop is converted by a characteristic curve of the high-side temperature-reducing regulating valve according to the feed-forward quantity of the high-side temperature-reducing regulating loop; and the flow demand of the high-side temperature-reducing water is the product of the high-side steam flow instruction and the design proportioning coefficient of the high-side temperature-reducing water.
Preferably, the feed-forward quantity of the low bypass pressure regulating circuit is the sum of the high bypass steam flow instruction and the bypass temperature reduction water flow demand, and the override quick opening quantity of the low bypass pressure regulating circuit is converted by a low bypass pressure regulating valve characteristic curve according to the feed-forward quantity of the low bypass pressure regulating circuit.
Preferably, the feed-forward quantity of the low-side desuperheating regulating loop is the low-side desuperheating water flow demand quantity, and the override quick opening quantity of the low-side desuperheating regulating loop is converted by a low-side desuperheating regulating valve characteristic curve according to the feed-forward quantity of the low-side desuperheating regulating loop; the low bypass desuperheating water flow demand is the product of a low bypass steam flow instruction and a low bypass desuperheating water design proportioning coefficient, and the low bypass steam flow instruction is obtained through calculation of a low bypass pressure regulating valve opening instruction, the reheating steam temperature and the reheating steam pressure.
Preferably, the method further comprises the step of linearly matching the series valve characteristic curve modules between the regulators and the manual operators in all the regulating circuits.
Compared with the prior art, the load shedding control system of the bypass system of the thermal power generating unit in the isolated grid mode has the following effects:
1) when the thermal power generating unit adopting the technical scheme of the invention is used for load shedding, the control mode of the bypass can be reasonably determined, and the override quick opening and the regulation feedforward quantity of each regulation loop are accurately matched through working medium balance calculation, so that the thermal power generating unit has good anti-interference characteristic, various interference factors can be inhibited in the load shedding process, and the steam parameter control quality is improved;
2) when the thermal power generating unit adopts the technical scheme of the invention, the optimal set values of the steam parameters are selected according to different working conditions when the load is shed, so that the steam parameters are effectively ensured to be controlled at a reasonable level, and the safe and stable operation of the thermal power generating unit is facilitated;
3) the technical scheme of the invention has the advantages of simple structure, intuitive control parameters, strong practicability and strong operability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a thermal power generating unit bypass system load shedding control system in an isolated grid mode according to the present invention;
FIG. 2 is a logic block diagram of a control mode conversion module according to the present invention;
FIG. 3 is a logic block diagram of the override feedforward calculation module of the present invention.
Detailed Description
The following further description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and is not intended to limit the scope of the present invention.
The utility model provides a thermal power unit bypass system load shedding control system under isolated network mode, is applied to the thermal power unit bypass control system in the isolated network, includes: control mode conversion module, override feedforward calculation module, steam parameter control module, wherein, control mode conversion module: the system comprises a load shedding signal processor, a controller and a controller, wherein the load shedding signal processor is used for judging a full load shedding working condition and a partial load shedding working condition according to the load shedding signal monitored in real time and generating conversion instructions, and the conversion instructions comprise a quick opening instruction, a manual-automatic switching instruction and a steam parameter setting instruction;
an override feedforward calculation module: the bypass temperature control system is used for calculating the override quick opening and the adjustment feedforward quantity of each bypass adjusting loop, specifically, calculating the override quick opening and the adjustment feedforward quantity of a selected high bypass pressure adjusting loop according to the full load throwing working condition and the part load throwing working condition, calculating the override quick opening and the adjustment feedforward quantity of the high bypass temperature adjusting loop according to a high bypass steam flow instruction, calculating the override quick opening and the adjustment feedforward quantity of a low bypass pressure adjusting loop according to the high bypass steam flow instruction, and calculating the override quick opening and the adjustment feedforward quantity of the low bypass temperature adjusting loop according to the low bypass steam flow instruction;
the steam parameter control module: and the control is carried out according to the acquired conversion instruction, the override quick-opening amount and the adjustment feed-forward amount.
As shown in fig. 1, the present invention provides a load shedding control system for a bypass system of a thermal power generating unit in an isolated grid mode, including:
and step 100, judging the load shedding working condition according to the load shedding signal to generate a quick opening instruction, a manual automatic switching instruction and a steam parameter setting instruction.
The step is shown in fig. 2, and is a control mode conversion module for monitoring a load shedding signal in real time, judging a full load shedding working condition and a partial load shedding working condition, and generating a related instruction. When the tripping of the steam turbine, the disconnection of the generator or the OPC action is monitored, the full load shedding of the unit is judged, and a full load shedding quick-start request is triggered by 2-second width pulse; and when the frequency modulation quick load shedding is monitored, judging that the unit throws a part of load, and triggering a throwing part load quick start request by using 2-second width pulse. When the bypass strong-off condition is not locked, the two fast-open requests trigger a bypass fast-open instruction.
After a bypass quick opening instruction is obtained, the high and low bypass pressure regulating circuits and the high and low bypass valve rear temperature regulating circuits immediately execute quick opening actions and are switched to a manual mode, and the automatic mode is switched to an automatic mode after 1 second.
When load shedding is carried out, the change range of steam parameters is large before and after a bypass quick opening instruction is executed, if the steam parameters cannot be quickly controlled at a reasonable level, the stable operation of a unit is not facilitated, therefore, the steam pressure and the temperature set value need to be matched and set, and the steam parameter control is ensured to be respectively suitable for two load shedding working conditions.
Switching the set value of the high bypass steam parameter, enabling the high bypass pressure regulating loop to exit from a pressure bias mode and set the rate limit when the bypass is opened quickly, taking the actual value of the main steam pressure before the bypass is opened quickly for 3 seconds as the set value of the main steam pressure, and recovering the set rate limit after the bypass is opened quickly; and summing the steam saturation temperature after the high side valve and a preset superheat allowance, and selecting the sum as a high side valve rear temperature set value after the sum is higher than a high side valve rear temperature actual value 3 seconds before the bypass is opened.
Switching the set value of the low bypass steam parameter, enabling the low bypass pressure regulating loop to exit the set rate limit when the bypass is opened quickly, assigning the set value of the reheat steam pressure as the actual value of the reheat steam pressure before the bypass is opened quickly for 3 seconds when the load of the dump part is opened quickly, otherwise assigning the actual value of the reheat steam pressure as the impulse pressure of the reheat steam, wherein the actual value of the reheat steam pressure is 1MPa, and restoring the set rate limit after the bypass is opened quickly; a reheat steam pressure low-limit function generated by the pressure of a speed regulation stage according to the load state of a unit needs to be cut off during load shedding, otherwise, the parameter mismatching of main and reheat steam can be caused due to the fact that the set value of the reheat steam pressure is higher; the reheating steam pressure low-limit function is reactivated after the unit is in grid-connected operation, the high side is closed and the load shedding is finished for a certain time, wherein the load shedding finishing time is 300 seconds in the example; and when the bypass is opened quickly, assigning the set value of the temperature behind the low side valve as the actual value of the temperature behind the low side valve before the bypass is opened quickly for 3 seconds.
And 101, calculating the override quick opening amount and the adjustment feedforward amount of each adjusting loop of the bypass according to the load shedding working condition.
As shown in fig. 3, the step is an override feedforward calculation module, configured to calculate an override quick-opening amount and an adjustment feedforward amount of each bypass adjustment loop, specifically, calculate an override quick-opening amount and an adjustment feedforward amount of a selected high bypass pressure adjustment loop according to a full-load rejection condition and a part-load rejection condition, calculate an override quick-opening amount and an adjustment feedforward amount of a high bypass temperature reduction adjustment loop according to a high bypass steam flow instruction, calculate an override quick-opening amount and an adjustment feedforward amount of a low bypass pressure adjustment loop according to a high bypass steam flow instruction, and calculate an override quick-opening amount and an adjustment feedforward amount of a low bypass temperature reduction adjustment loop according to a low bypass steam flow instruction.
The fast opening of the override of the high-side pressure regulating loop and the regulation feedforward quantity are calculated and selected according to the full load throwing working condition and the partial load throwing working condition on the main steam flow and the load throwing quantity, wherein:
and the override quick opening of the high bypass pressure regulating circuit is converted through a characteristic curve of the high bypass pressure regulating valve according to the high bypass steam flow demand. When the full load is thrown, the high bypass steam flow demand after the bypass is opened quickly is the main steam flow before the bypass is opened quickly. The main steam flow is the sum of the steam inlet amount of the high pressure cylinder of the steam turbine and the high bypass steam flow, and the high bypass steam flow is calculated through a flow formula according to the opening feedback of the high bypass pressure regulating valve and the temperature and pressure of the main steam. When partial load is thrown, the high bypass steam flow demand after the bypass is opened quickly is the sum of a high bypass steam flow instruction before the bypass is opened quickly and a high bypass steam flow increment caused by the load throwing, the high bypass steam flow instruction is calculated through a flow formula according to a high bypass pressure regulating valve opening instruction and main steam temperature and pressure, and the high bypass steam flow increment is calculated through a designed steam power ratio according to the power difference of the unit before and after the load throwing. In the example, the steam flow and the steam flow instruction before the bypass is opened quickly are actual values before 2 seconds registered by the bypass quick opening instruction, and the high bypass steam flow increment is the product of the difference value between the unit power before 2 seconds registered by the frequency modulation quick unloading and the real time value and the designed steam power ratio. The feed forward amount of the high side pressure regulation loop is the high side steam flow increment. In the embodiment, the feedforward quantity enters the regulator when the bypass is opened quickly, is effective when the regulating loop is automatic, and is cut off by utilizing the tracking function of the regulator when the frequency modulation quick load shedding is finished, so that the effective matching of power change can be ensured during the continuous frequency modulation quick load shedding of the unit.
The feed-forward quantity of the high-side temperature-reducing regulating loop is the product of the flow demand of the high-side temperature-reducing water, namely the product of a high-side steam flow instruction and a high-side temperature-reducing water design proportioning coefficient, and the override quick opening quantity of the high-side temperature-reducing regulating loop is converted by a characteristic curve of the high-side temperature-reducing regulating valve according to the feed-forward quantity.
The feedforward quantity of the low bypass pressure regulating loop is the low bypass steam flow demand, namely the sum of the high bypass temperature-reducing water flow demand and the high bypass steam flow instruction, and the override quick opening quantity of the low bypass pressure regulating loop is converted by a characteristic curve of the low bypass pressure regulating valve according to the feedforward quantity.
The feed-forward quantity of the low-side desuperheating regulating loop is the flow demand quantity of the low-side desuperheating water, namely the product of a low-side steam flow instruction and a low-side desuperheating water design proportioning coefficient, and the override quick opening quantity of the low-side desuperheating regulating loop is converted through a low-side desuperheating regulating valve characteristic curve according to the feed-forward quantity. And the low bypass steam flow instruction is calculated through a flow formula according to the opening instruction of the low bypass pressure regulating valve and the temperature and the pressure of the reheated steam.
And 102, controlling according to the quick opening instruction, the manual automatic switching instruction, the steam parameter setting instruction, the override quick opening amount and the adjustment feed-forward amount.
The steam parameter control module is used for executing mode conversion and regulation control according to the conversion instruction acquired by the control mode conversion module and the override quick opening amount and the regulation feedforward amount acquired by the override feedforward calculation module. The valve characteristic curve modules are connected in series between the regulators and the manual operators in all the regulating loops for linear matching, so that good regulating quality is ensured.
Compared with the prior art, the load shedding control system of the bypass system of the thermal power generating unit in the isolated grid mode has the following effects:
1) when the thermal power generating unit adopting the technical scheme of the invention is used for load shedding, the control mode of the bypass can be reasonably determined, and the override quick opening and the regulation feedforward quantity of each regulation loop are accurately matched through working medium balance calculation, so that the thermal power generating unit has good anti-interference characteristic, various interference factors can be inhibited in the load shedding process, and the steam parameter control quality is improved;
2) when the thermal power generating unit adopts the technical scheme of the invention, the optimal set values of the steam parameters are selected according to different working conditions when the load is shed, so that the steam parameters are effectively ensured to be controlled at a reasonable level, and the safe and stable operation of the thermal power generating unit is facilitated;
3) the technical scheme of the invention has the advantages of simple structure, intuitive control parameters, strong practicability and strong operability.
The above description is given for the sake of clarity only and is not intended to limit the scope of the invention. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a thermal power generating unit bypass system load shedding control system under isolated network mode which characterized in that includes: the system comprises a control mode conversion module, an override feedforward calculation module and a steam parameter control module, wherein the control mode conversion module, the override feedforward calculation module and the steam parameter control module are connected with the steam parameter control module;
a control mode conversion module: the system comprises a load shedding signal processor, a controller and a controller, wherein the load shedding signal processor is used for judging a full load shedding working condition and a partial load shedding working condition according to the load shedding signal monitored in real time and generating conversion instructions, and the conversion instructions comprise a quick opening instruction, a manual-automatic switching instruction and a steam parameter setting instruction;
an override feedforward calculation module: the bypass temperature control system is used for calculating the override quick opening and the adjustment feedforward quantity of each bypass adjusting loop, specifically, calculating the override quick opening and the adjustment feedforward quantity of a selected high bypass pressure adjusting loop according to the full load throwing working condition and the part load throwing working condition, calculating the override quick opening and the adjustment feedforward quantity of the high bypass temperature adjusting loop according to a high bypass steam flow instruction, calculating the override quick opening and the adjustment feedforward quantity of a low bypass pressure adjusting loop according to the high bypass steam flow instruction, and calculating the override quick opening and the adjustment feedforward quantity of the low bypass temperature adjusting loop according to the low bypass steam flow instruction;
the steam parameter control module: and the control is carried out according to the acquired conversion instruction, the override quick-opening amount and the adjustment feed-forward amount.
2. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 1, wherein the judgment conditions of the full load shedding working condition are as follows: any action of the steam turbine tripping, the generator splitting and the OPC action is established, and the judgment condition of the load shedding part is as follows: frequency modulation quick load shedding;
generating a full load shedding quick-opening request when the full load shedding working condition is met, generating a partial load shedding quick-opening request when the partial load shedding working condition is met, and generating a quick-opening instruction when the full load shedding quick-opening request or the partial load shedding quick-opening request occurs and a bypass does not have a strong-closing condition;
the manual-automatic switching instruction comprises the steps of immediately executing the quick opening action and switching all the regulating circuits to the manual mode after the quick opening instruction is generated, and switching back to the automatic mode after the quick opening action is executed;
the steam parameter setting instruction comprises the switching of a main reheating steam pressure setting value and a high and low bypass valve rear temperature setting value; and after the quick opening action is executed, switching a main steam pressure set value, a high side valve rear temperature set value and a low side valve rear temperature set value into actual values before the quick opening action, switching a reheating steam pressure set value into a unit rush-turning pressure when a full load is thrown, and switching into the actual values before the quick opening action when a partial load is thrown.
3. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 1, wherein the override quick opening amount of the high bypass pressure regulating loop is converted through a characteristic curve of a high bypass pressure regulating valve according to the high bypass steam flow demand; when the load is thrown under the full load working condition, the main steam flow before the load is thrown is used as a high side steam flow demand, and when the load is thrown under the partial load working condition, the sum of the high side steam flow increment and the high side steam flow instruction before the load is thrown is used as the high side steam flow demand; the feed forward quantity of the high bypass pressure regulating loop is a high bypass steam flow increment;
the main steam flow is the sum of the steam inlet amount of a high-pressure cylinder of the steam turbine and the high bypass steam flow, the high bypass steam flow is obtained through the opening feedback of a high bypass pressure regulating valve and the calculation of the temperature and the pressure of main steam, the high bypass steam flow instruction is obtained through the opening instruction of the high bypass pressure regulating valve and the calculation of the temperature and the pressure of the main steam, and the high bypass steam flow increment is the product of the power difference of the unit before and after the load shedding part and the designed steam power ratio.
4. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 3, wherein the feed-forward quantity of the high-side temperature-reducing regulating loop is a high-side temperature-reducing water flow demand quantity, and the override quick opening quantity of the high-side temperature-reducing regulating loop is converted through a high-side temperature-reducing regulating valve characteristic curve according to the feed-forward quantity of the high-side temperature-reducing regulating loop; and the flow demand of the high-side temperature-reducing water is the product of the high-side steam flow instruction and the design proportioning coefficient of the high-side temperature-reducing water.
5. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 4, wherein the feed-forward quantity of the low bypass pressure regulating loop is the sum of the high bypass steam flow command and a bypass desuperheating water flow demand, and the quick override quantity of the low bypass pressure regulating loop is converted by a low bypass pressure regulating valve characteristic curve according to the feed-forward quantity of the low bypass pressure regulating loop.
6. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 1, wherein the feed-forward quantity of the low-side desuperheating regulating loop is a low-side desuperheating water flow demand quantity, and the override quick opening quantity of the low-side desuperheating regulating loop is converted through a low-side desuperheating regulating valve characteristic curve according to the feed-forward quantity of the low-side desuperheating regulating loop; the low bypass desuperheating water flow demand is the product of a low bypass steam flow instruction and a low bypass desuperheating water design proportioning coefficient, and the low bypass steam flow instruction is obtained through calculation of a low bypass pressure regulating valve opening instruction, the reheating steam temperature and the reheating steam pressure.
7. The thermal power generating unit bypass system load shedding control system in the isolated grid mode according to claim 1, further comprising a series valve characteristic curve module for linear matching between the regulators and the manual operators in all the regulating loops.
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| CN111123770B (en) * | 2019-12-13 | 2021-09-24 | 山东中实易通集团有限公司 | Method and device for determining opening of bypass model under FCB working condition |
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| CN112127960B (en) * | 2020-09-07 | 2022-06-24 | 国网湖北省电力有限公司电力科学研究院 | Steam turbine bypass control method based on full-automatic load shedding working condition |
| CN112412558A (en) * | 2020-11-17 | 2021-02-26 | 广西电网有限责任公司电力科学研究院 | Thermal power generating unit control system with quick load shedding function |
| CN112627923B (en) * | 2020-11-30 | 2022-12-02 | 重庆工程职业技术学院 | Steam turbine rotating speed control method based on valve characteristic curve under extreme working condition |
| CN114776406B (en) * | 2022-04-20 | 2024-01-26 | 华北电力科学研究院有限责任公司 | Heat supply bypass fault load reduction method and device based on deep peak shaving working condition |
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