CN113972672B - Automatic generating capacity control method based on machine-furnace decoupling and variable parameter adjustment - Google Patents
Automatic generating capacity control method based on machine-furnace decoupling and variable parameter adjustment Download PDFInfo
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- CN113972672B CN113972672B CN202111502353.8A CN202111502353A CN113972672B CN 113972672 B CN113972672 B CN 113972672B CN 202111502353 A CN202111502353 A CN 202111502353A CN 113972672 B CN113972672 B CN 113972672B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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Abstract
The invention relates to an automatic generating capacity control method based on machine-furnace decoupling and variable parameter adjustment, which comprises the following steps of: s100: modifying the DEH control system to enable the modified DEH control system to receive a power command sent by the AGC control system; s200: modifying a CCS control system, and canceling a turbine power controller in the CCS control system; s300: optimizing the variable load rate of the steam turbine according to the load adjustment capacity of the steam turbine; s400: setting a main steam pressure deviation correction loop, and setting pulse time reset rate and a large reset rate function of the deviation of the machine furnace instruction; s500: and adding a numerical value correction module capable of adjusting and adjusting the dead zone value in a command loop between the AGC control system and the modified DEH control system. The invention utilizes the heat storage capacity of the boiler and the adjustment rapidity of the steam turbine to the utmost extent, improves the AGC (automatic gain control) adjustment performance of the unit, meets the rapid and corresponding requirements of the power grid on the power supply side, and ensures that the power grid runs economically and stably.
Description
Technical Field
The invention relates to the field of power systems, in particular to an automatic power generation control method based on machine furnace decoupling and variable parameter adjustment.
Background
With the development of electric power industry in China, an automatic generation control technology (AGC) becomes an important control mode for economic and stable operation of a power grid, and is a basic and important function for the development of modern power grids. AGC automatic generation amount control is a function of controlling the output of a frequency modulation unit by a power grid so as to meet the continuously changing power demand of a user and enable a system to be in a balanced and stable running state. In order to improve the economic reliability of the AGC control system, the modern society puts forward higher requirements on a power grid, so that power generation enterprises need to continuously explore unit potentials, innovate ideas and improve the corresponding performances of the unit AGC control system, and particularly K1, K2, K3 and Kp values are used as unit AGC performance evaluation indexes.
At present, the prior art solutions mainly have the following disadvantages:
(1) The boiler has large regulating inertia
A conventional coordination control system is the basis of AGC function optimization, according to a load instruction, a steam turbine directly adjusts power through a throttle, and a boiler adjusts air, coal and water and responds to temperature and pressure parameters. The response of the boiler has large inertia, and the parameter response is lagged compared with that of a steam turbine.
(2) DEH power controller (i.e., DEH control system) parameter setting impact
The DEH control system is a digital electro-hydraulic regulation control system for realizing closed-loop control on the steam turbine generator unit, and takes the steam turbine generator unit as a control object. The adaptive capacity of an AGC control system is not considered too much in conventional infrastructure debugging, in order to ensure the stability of the DEH control system, the power PID control parameters in the DEH control system are generally set to be weak, the adjustment is slow, and the phenomenon of over-regulation is avoided, so that dead zones cannot be crossed in a short time when the load instruction variation quantity sent by the AGC control system is small.
(3) Hysteresis of signal communication transmission
The method comprises the steps that a power grid is dispatched and sent AGC instruction communication to an RTU (remote control system), an RTU hard wire is sent to a CCS (distributed control system), the CCS receives the instruction and adjusts active power, a real active power hard wire is sent to the RTU control system, and the RTU control system sends real power communication to the power grid for dispatching, so that closed loop is completed. In the process, communication has certain time delay, and the effect of dead zones exists in real active power refreshing.
(4) Wide range of variation and frequent back-tuning in "R" mode
When a conventional unit operates in an AGC-R mode, a load instruction sent by an AGC control system is large, the range changes frequently, if a speed set value is increased in order to respond to the change rate of K1, certain effect is achieved, but instability of steam temperature and pressure regulation is increased. And the load instruction sent by the AGC control system changes direction frequently, and the feed-forward action strengthens the automatic disturbance of the water, coal and air on the furnace side, thus being not beneficial to the stability of the system.
Disclosure of Invention
The invention mainly aims to provide an automatic power generation amount control method based on machine-furnace decoupling and variable parameter adjustment, so as to solve the problem that a system is unstable due to load instruction change between an AGC control system and a CCS control system.
In order to achieve the aim, the invention provides an automatic power generation control method based on machine-furnace decoupling and variable parameter adjustment, which comprises the following steps of:
s100: modifying the DEH control system so that the modified DEH control system can receive the power command sent by the AGC control system, and the modified DEH control system can adjust the load of the steam turbine;
s200: modifying a CCS control system, and canceling a turbine power controller in the CCS control system;
s300: optimizing the variable load rate of the steam turbine according to the load adjustment capacity of the steam turbine after modification according to the step S100 and the step S200;
s400: setting a main steam pressure deviation correction loop, and setting pulse time reset rate and a large reset rate function of the deviation of the machine furnace instruction;
s500: and adding a numerical value correction module in an instruction loop between the AGC control system and the modified DEH control system, wherein when the numerical value correction module receives the change of a load instruction from the AGC control system, the numerical value correction module superposes a dead zone offset value on the basis of the existing regulation dead zone value, and when the unit regulation deviation returns to zero and spans the modified regulation dead zone value, the numerical value correction module performs zero returning operation on the superposed dead zone offset value.
Preferably, in step S100, the method further includes the steps of:
s110: modifying PID control parameters in the DEH control system, and increasing a rapid parameter regulation logic on the basis of the original PID control parameters, wherein the PID control parameter switching condition logic is as follows: when the instruction sent by the AGC control system changes, the PID control parameter switches the normal adjusting parameter into the quick adjusting parameter, and after the standby furnace crosses the modified adjusting dead zone value, the PID control parameter is adjusted into the normal adjusting parameter.
Further preferably, the quick adjustment parameters in the PID control parameters of the boiler are determined by carrying out a fixed value disturbance test on the modified DEH control system.
Still further preferably, the dead band offset value is determined by adjusting the dead band value based on repeated refreshes of the load command by the RTU control system and the modified CCS control system.
The invention has the beneficial effects that:
according to the invention, the DEH control system and the CCS control system are modified to separate the boiler main control system and the turbine main control system, so that two parallel instruction loops are formed, and the boiler main control system and the turbine main control system respectively receive load instructions issued by the AGC control system, so that the large inertia rigidity of the boiler is avoided through self-adaptive decoupling of the boiler, and the unit is adapted to frequent reverse adjustment in an 'R' mode. In addition, the invention sets automatic bias logic between the AGC control system and the modified DEH control system, and adds the dead zone bias value to the AGC command loop to form partial overshoot action, thereby overcoming the influence of the refresh dead zone of the RTU system.
The invention utilizes the boiler heat storage capacity and the turbine adjustment rapidity to the maximum extent by introducing the numerical value correction module in the instruction loop in the DEH power controller variable parameter adjustment and AGC control system after the self-adaptive decoupling and modification of the boiler, improves the AGC adjustment performance of the unit, meets the requirement of the power grid on the rapid response of the power supply side, and ensures that the power grid runs economically and stably.
Detailed Description
The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the embodiment of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and it will be appreciated by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention and that the present invention is not limited by the specific embodiments disclosed below.
The invention provides an automatic power generation control method based on machine-furnace decoupling and variable parameter adjustment, which comprises the following steps of:
s100: modifying the DEH control system so that the modified DEH control system can receive the power command sent by the AGC control system and the DEH control system can adjust the machine load;
in step S100, the method further includes:
s110: modifying PID control parameters in the DEH control system, and increasing a rapid parameter regulation logic on the basis of the original PID control parameters, wherein the PID control parameter switching condition logic is as follows: when the load instruction sent by the AGC control system changes, the PID control parameter switches the normal adjusting parameter into the quick adjusting parameter, and after the standby furnace spans the variable quantity to be adjusted (namely, after the standby furnace spans the modified adjusting dead zone value), the PID control parameter is adjusted into the normal adjusting parameter. It should be noted that the PID control parameters for determining different variable load rates of the furnace are obtained by performing a fixed value disturbance test on the modified DEH control system. The fixed value perturbation test is a general test method, and therefore, the detailed test process is not described in detail in this embodiment.
S200: the CCS control system is modified to eliminate the turbine power controller (i.e., DEH control system) in the CCS control system. It can be seen that, by combining step S200 and step S100, the steam turbine main control system and the boiler main control system form two parallel command loops, that is, the steam turbine main control system (i.e., the modified DEH control system) can directly receive the load command sent by the AGC control system, and the boiler main control system also directly receives the load command of the AGC control system. It should be noted that the CCS Control System before modification is an abbreviation of english coding Control System, and the CCS Control System before modification simultaneously sends out an instruction to the boiler Control System and the steam turbine Control System, so as to achieve the purpose of quickly responding to load change, exert the frequency modulation and peak shaving capabilities of the unit as much as possible, and stabilize the operation parameters. After the modification of the application, the modified CCS control system does not send a coordination command to the steam turbine control system any more.
S300: optimizing the variable load rate of the steam turbine according to the load adjustment capacity of the steam turbine after modification according to the step S100 and the step S200; during adjustment, because the response of the steam turbine is faster than the response of the boiler, the load of the steam turbine needs to be adjusted so that the steam turbine and the boiler are relatively consistent. In this step, a conventional adjustment method is adopted.
S400: and a main steam pressure deviation correction loop, a pulse time reset rate and a machine furnace instruction deviation large reset rate are set. In the step, in order to avoid the phenomenon that the furnace load is not matched when the large load changes, and the main steam pressure is deviated too much, a main steam pressure deviation correction loop is arranged, and the pulse time reset rate and the furnace instruction deviation large reset rate function are arranged. In the step, the functions of the set main steam pressure deviation correction loop, the set pulse time reset rate and the large reset rate of the machine furnace instruction deviation adopt a conventional loop, and can be set according to actual conditions.
S500: and adding a numerical correction module in an instruction loop between the AGC control system and the modified DEH control system, wherein when the numerical correction module receives a load instruction sent by the AGC control system and changes, the numerical correction module superposes a dead zone offset value on the basis of the existing regulation dead zone value, and when the unit regulation deviation returns to zero and spans the modified regulation dead zone value, the numerical correction module performs zero returning on the superposed dead zone offset value. The dead zone offset value is determined by adjusting the dead zone value for the load command and the repeated refresh according to the RTU control system and the CCS control system.
By way of example: the current unit is operated at 200MW, and the adjustment dead zone value of 200MW is ± 3.5MW (the adjustment dead zone value is a known value, which is given by an operator, that is, the operation interval of the current unit is 200 ± 3.5MW, which is higher than 203.5 or lower than 196.5, which results in data refresh between the RTU control system and the modified CCS control system), if the unit crosses 203.5MW upward (this embodiment is illustrated by 203.5 MW), the influence of the refresh dead zone may be generated, which causes a data refresh delay between the RTU control system and the modified CCS control system, so that the influence of the refresh dead zone is avoided by adding a certain dead zone offset value of 0.5MW (this value is adjustable) on the basis of the adjustment dead zone value. The dead zone value can be considered as a key node, a certain dead zone offset value is set on the key node to serve as buffering, and therefore the phenomenon of refreshing dead zones on the key node caused by the running electric quantity of the unit is facilitated. And after the safety degree of the unit operation electric quantity exceeds the adjustment dead zone value, the unit operation electric quantity can smoothly or steadily rise until the next adjustment dead zone value serving as a key node is met, and the numerical value correction module continues to operate.
That is to say, after the load command of the AGC control system changes (for example, 200MW of current operation is to be increased to 300 MW), at this time, the value correction module increases the dead zone offset value of 0.5MW on the basis of the existing adjustment dead zone value of 3.5MW, that is, the adjustment dead zone value will be changed from 3.5MW to 4MW, so that the adjustment dead zone value forms a partial overshoot, and after the operation electric quantity of the unit crosses 204MW, the value correction module returns the dead zone offset value of 0.5MW increased in the adjustment dead zone value to zero, so that the adjustment dead zone value continues to be changed to the original 3.5MW, thereby continuing to ensure the adjustment accuracy, and thus avoiding the influence of dead zone refresh. After the unit operation electric quantity exceeds 204MW, the unit operation electric quantity continues to rise (the middle needs to pass through a certain running-in operation interval, and then continues to rise from the running-in interval, and the detailed process is not repeated here) until the unit operation electric quantity approaches 300MW. And when the running electric quantity of the unit rises to an interval close to 296.5MW (300 MW-3.5MW = 296.5MW), the numerical value correction module continuously sets the regulation dead zone value to 3.5-0.5=3MW (namely, the unit already crosses over the original regulation dead zone value 296.5MW going downwards at the moment), when the running electric quantity of the unit crosses 297MW, the numerical value correction module continuously adjusts the regulation dead zone value to 3.5MW, the running electric quantity of the unit continuously rises, and when the running electric quantity of the unit reaches 300MW, the unit stops rising. Finally, the unit is operated between 300 +/-3.5 MW until the next time the conforming instruction sent by the AGC control system changes.
And the dead zone offset value is determined by repeatedly refreshing and adjusting the dead zone value according to the RTU control system and the modified CCS control system for the load instruction, and continuously testing different dead zone offset values, so that a value with small influence on the refreshing dead zone is obtained.
In summary, the present application has the following advantages, analyzed as follows:
(1) Avoiding influence of boiler regulation inertia on K3 and K1 through self-adaptive decoupling of boiler
In the prior art, a CCS control system adjusts load by a steam turbine and adjusts pressure of a boiler on the basis of coordinating all subsystems to achieve overall adjustment and unified pace (which is the working principle of a common CCS control system in the prior art), however, the steam turbine control system is adjusted quickly, the boiler control system is slow in response, the steam turbine control system and the boiler control system cannot achieve certain synchronous coordination, the advantage of quick response of the steam turbine cannot be reflected, if direct acceleration rate cannot lead to quick disturbance of boiler adaptation, and parameters are deviated. Therefore, the power change speed directly influences the K3 and K1 values. The optimized scheme separates the part of a DEH control system in a CCS control system instruction forming loop, separately controls the load change rate, and reasonably utilizes the advantage of load change rapidity of the steam turbine. After logic optimization, the machine furnace load instruction forms loop separation, and a boiler control system and a steam turbine control system synchronously receive load rate limit of an operator, and the rates are the same as each other. The difference between the two is that the boiler side is fully executed according to the load rate input by the operator, and the steam turbine side utilizes the short-term heat storage capacity of the boiler. And (3) superposing a dead zone offset value at the initial stage after the load instruction sent by the AGC control system is changed so as to achieve the purpose of rapidly crossing and adjusting the dead zone. In order to avoid the problems that the furnace load is not matched when the heavy load changes, the main steam pressure is deviated too much, and the functions of a main steam pressure deviation correction loop, pulse time reset rate setting and large furnace instruction deviation reset rate setting are arranged. In the process of load lifting, if the command deviation of the engine furnace is large and reset, the engine furnace can have the command deviation of adjusting the dead zone value, the speed change of the steam turbine is reduced to achieve the balance of the engine furnace, and allowance is left for the load command change sent by the AGC control system next time. The method and the device enhance the load instruction response capability of the initial stage of the steam turbine, improve the K3 value well, and improve the K1 value in an auxiliary manner. If the load instruction variable quantity sent by each single AGC control system is smaller, the effect of improving the K1 value through the optimization assistance is more obvious, the actual boiler regulation rate is not increased, and the boiler regulation stability is facilitated.
(2) Variable parameter regulation of power controller
The three factors of PID control parameter adjustment are stability, rapidity and accuracy, the DEH control system has stability, accuracy and lack of rapidity, and if the rapidity is simply improved, the stability of the DEH control system is affected, so that the variable parameter adjustment is realized through logic optimization (namely, the rapid parameter adjustment is added), the proportion and integral parameters of the PID control parameters are changed at the initial stage of the change of a load instruction sent by an AGC control system, the effect is enhanced, the rapid adjustment is realized, the original PID control parameters are recovered after the initial load adjustment is finished, the stability of the DEH control system is maintained, the K3 value is effectively improved, and the K1 value is improved in an auxiliary manner.
(3) The load instruction loop sent by the AGC control system is added with a value correction module to overcome the influence of the refresh dead zone of the RTU control system
Due to the influence of a data transmission refreshing regulation dead zone in the RTU control system, when a load instruction sent by the AGC control system fluctuates in a small range, although the coordination side is already adjusted, the situation that active power is transmitted to a power grid and cannot cross over the regulation dead zone value exists. According to the method, through logic optimization, a dead zone value offset value (adjustable) is added to be superposed on an adjusting dead zone value in a value correction module after a load instruction sent by an AGC control system is changed, so that the phase change of an adjusting loop generates small overshoot, and the adjusting dead zone is crossed. In order to not influence the adjustment precision, the dead zone offset is automatically reset and cleared after crossing the dead zone, and the adjustment precision can be continuously ensured.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Claims (4)
1. The automatic power generation control method based on machine-furnace decoupling and variable parameter adjustment is characterized by comprising the following steps of:
s100: modifying the DEH control system so that the modified DEH control system can receive the power command sent by the AGC control system, and the modified DEH control system can adjust the load of the steam turbine;
s200: modifying a CCS control system, and canceling a turbine power controller in the CCS control system;
s300: optimizing the variable load rate of the steam turbine according to the load adjustment capacity of the steam turbine after modification according to the step S100 and the step S200;
s400: setting a main steam pressure deviation correction loop, setting a pulse time reset rate and a large reset rate of the deviation of the machine furnace instruction;
s500: and adding a numerical value correction module in an instruction loop between the AGC control system and the modified DEH control system, wherein when the numerical value correction module receives the change of a load instruction from the AGC control system, the numerical value correction module superposes a dead zone offset value on the basis of the existing regulation dead zone value, and when the unit regulation deviation returns to zero and spans the modified regulation dead zone value, the numerical value correction module performs zero returning operation on the superposed dead zone offset value.
2. The automatic power generation amount control method based on machine-furnace decoupling and variable parameter adjustment according to claim 1, wherein in step S100, the method further comprises the following steps:
s110: modifying PID control parameters in the DEH control system, and increasing a rapid parameter regulation logic on the basis of the original PID control parameters, wherein the PID control parameter switching condition logic is as follows: when the instruction sent by the AGC control system changes, the PID control parameter switches the normal adjusting parameter into the quick adjusting parameter, and after the standby furnace crosses the modified adjusting dead zone value, the PID control parameter is adjusted into the normal adjusting parameter.
3. The automatic power generation control method based on machine-furnace decoupling and variable parameter regulation according to claim 2, characterized in that the determination of the fast regulation parameters in the machine-furnace PID control parameters is obtained by performing a fixed value disturbance test on the modified DEH control system.
4. The automatic power generation control method based on machine-furnace decoupling and variable parameter regulation according to claim 3, wherein the dead zone offset value is determined by repeatedly refreshing the load command by the RTU control system and the modified CCS control system to adjust the dead zone value.
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