CN112583056A - Power plant AGC and primary frequency modulation cooperation control system and method in opening degree mode - Google Patents
Power plant AGC and primary frequency modulation cooperation control system and method in opening degree mode Download PDFInfo
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- CN112583056A CN112583056A CN202011241856.XA CN202011241856A CN112583056A CN 112583056 A CN112583056 A CN 112583056A CN 202011241856 A CN202011241856 A CN 202011241856A CN 112583056 A CN112583056 A CN 112583056A
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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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Abstract
A power plant AGC and primary frequency modulation cooperation control system and method under an opening degree mode comprises a monitoring system and a speed regulating system; the monitoring system receives an AGC command issued by AGC of a power plant, receives a unit frequency signal and a primary frequency modulation action signal sent by a speed regulating system, collects an active power signal output by the unit in real time for generating power and outputs a rapid pulse regulation command; the monitoring system calculates a primary frequency modulation action target value according to the unit frequency and the performance requirement of the power grid on primary frequency modulation, and the primary frequency modulation action target value is superposed on an AGC command issued by an AGC of a power plant to generate an active power target value; and an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time. The invention aims to coordinate the mutual matching relationship between AGC and primary frequency modulation of a power plant, avoid contradiction conflict between the AGC and the primary frequency modulation in the control of the hydraulic generator set, and ensure the normal safe and stable operation of the hydraulic generator set and a power grid.
Description
Technical Field
The invention belongs to the field of automatic control of hydropower stations, and particularly relates to a system and a method for controlling cooperation of AGC and primary frequency modulation of a power plant in an opening mode.
Background
At present, the AGC of a power plant and the primary frequency modulation are both used for ensuring the active power supply balance of a power grid, but the AGC of the power plant and the primary frequency modulation in an opening degree mode have matching problems, the primary frequency modulation cannot be superposed with the value issued by the AGC of the power plant, the effect of the primary frequency modulation is influenced by the value issued by the AGC of the power plant, the contradiction of control actions is easy to occur, and the normal safe and stable operation of a unit and the power grid is influenced.
In the prior art, a command power plant AGC issued by a power grid AGC is received without logic processing, and the power plant AGC and primary frequency modulation cooperation control method in an opening degree mode includes the following steps:
1) adopting a direct superposition mode of AGC and primary frequency modulation of a power plant;
2) and a power plant AGC and primary frequency modulation soft superposition mode is adopted, and a primary frequency modulation action locking mode is adopted, namely, when primary frequency modulation action is carried out, a locking monitoring system issues an opening degree adjusting instruction.
The above method has the following disadvantages:
the instruction sent by the power grid AGC and the reception of the no logic processing of the power plant AGC can cause the execution of the wrong instruction sent by the power grid AGC.
The mode of directly superposing the AGC of the power plant and the primary frequency modulation is adopted in the opening mode, so that the action amount of the primary frequency modulation can be offset by the AGC of the power plant when the primary frequency modulation acts, and the primary frequency modulation effect of a unit is lost.
A power plant AGC and primary frequency modulation soft superposition mode is adopted in the opening mode, and a primary frequency modulation action locking mode is adopted, so that the power plant AGC loses the effect during primary frequency modulation action, and the secondary frequency modulation function of the power grid AGC is lost.
In order to solve the problems, researchers in the field research and exploration, an article, "cooperative control transformation and experimental analysis of primary frequency modulation and AGC of a hydroelectric generating set" (hydropower and pumped storage volume 6, phase 2 (total phase 30), 20 months 04 and 20 days 2020, Luzhoxin, couragement, leaf green and the like) introduces requirements of a power grid company on optimization of coordination strategies of primary frequency modulation, AGC and a monitoring system on a power plant side, and relevant transformation and application experimental conditions of the power plant, but does not systematically and comprehensively disclose a coordination control method of the power grid AGC, the power plant AGC and the primary frequency modulation. Particularly, regarding a cooperative control method of the power plant AGC and the primary frequency modulation, the expression of related setting and reset logics of a 'primary frequency modulation priority' state bit is not clear and the logics are not strict, and meanwhile, the purpose of the 'primary frequency modulation priority' state bit is not clearly explained, so that researchers in the field can not understand the application and reproduce the method.
Disclosure of Invention
The invention provides a system and a method for controlling cooperation of AGC (automatic gain control) and primary frequency modulation of a power plant in an opening degree mode, which are suitable for a hydraulic power plant hydroelectric generating set and aim to coordinate the cooperation relationship between the AGC and the primary frequency modulation of the power plant, avoid contradiction conflict between the AGC and the primary frequency modulation in the control of the hydroelectric generating set and ensure normal, safe and stable operation of the unit and a power grid.
The technical scheme adopted by the invention is as follows:
a power plant AGC and primary frequency modulation cooperation control method in an opening degree mode comprises the following steps:
step 1: the monitoring system detects whether the opening degree mode of the speed regulating system exists, if so, the step 2 is carried out; otherwise, adopting a non-opening mode power plant AGC and primary frequency modulation matching control method;
step 2: the monitoring system detects the set frequency signal and the primary frequency modulation action signal sent by the speed regulation system, and the step 3 is carried out;
and step 3: the monitoring system detects and diagnoses whether the primary frequency modulation acts, and if the primary frequency modulation does not act, the target value of the primary frequency modulation action amount is 0; if the primary frequency modulation action is carried out, calculating a primary frequency modulation action target value in real time according to a permanent mode frequency modulation difference coefficient ep and a frequency difference delta f, wherein the delta f is 1-f/50, and the calculating method comprises the following steps: the primary frequency modulation action target value is delta f/ep. Entering the step 4;
and 4, step 4: the monitoring system calculates an active power target value which is an AGC command issued by the AGC of the power plant and a primary frequency modulation action target value, and then the step 5 is carried out;
and 5: and (3) an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time, and the step 1 is returned.
A power plant AGC and primary frequency modulation cooperation control system under an opening degree mode comprises: a monitoring system and a speed regulating system;
the monitoring system receives an AGC command issued by AGC of a power plant, receives a unit frequency signal and a primary frequency modulation action signal sent by a speed regulating system, collects an active power signal output by the unit in real time for generating power and outputs a rapid pulse regulation command;
the monitoring system calculates a primary frequency modulation action target value according to the unit frequency and the performance requirement of the power grid on primary frequency modulation, and the primary frequency modulation action target value is superposed on an AGC command issued by an AGC of a power plant to generate an active power target value;
and an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time.
The invention discloses a power plant AGC and primary frequency modulation cooperation control method in an opening degree mode, which has the advantages that:
the mutual matching relationship between the AGC of the power plant and the primary frequency modulation is coordinated, the contradiction conflict between the AGC of the power plant and the primary frequency modulation under the control mode of the opening degree mode of the hydroelectric generating set is avoided, the effect of the primary frequency modulation is not influenced by the newly issued value of the AGC of the power plant, the effect superposition is perfectly realized, and the normal safe and stable operation of the unit and the power grid is ensured
Drawings
FIG. 1 is a flow chart of a method for controlling the cooperation of AGC and primary frequency modulation of a power plant in an opening mode.
FIG. 2(1) is a schematic structural diagram of a power plant AGC and primary frequency modulation cooperative control system in an opening mode according to the present invention;
fig. 2(2) is a schematic structural diagram of the monitoring system of fig. 2 (1).
FIG. 3 is a waveform diagram of a logic test of the matching of the AGC of a speed regulator power plant and a primary frequency modulation.
Detailed Description
As shown in fig. 1, a method for controlling the cooperation of AGC and primary frequency modulation of a power plant in an opening mode includes the following steps: step 1: the monitoring system detects whether the opening degree mode of the speed regulating system exists, if so, the step 2 is carried out; otherwise, adopting a non-opening mode power plant AGC and primary frequency modulation matching control method;
a non-opening mode power plant AGC and primary frequency modulation cooperation control method is characterized in that an electronic regulator model for a water turbine regulating system disclosed by the invention patent CN105470953A is adopted, in a power mode, a speed regulating system receives a power plant AGC analog quantity control command issued by a monitoring system, primary frequency modulation action quantity is superposed in a speed regulator and fed back with unit active power detected by the speed regulator, closed-loop control is formed through a PID control module, and the opening of a guide vane is regulated; under the opening mode, the speed regulating system receives a power plant AGC switching value control command issued by the monitoring system, and forms closed-loop control with a unit frequency signal detected by the speed regulator through the PID control module to regulate the opening of the guide vane.
Step 2: the monitoring system detects a unit frequency signal f and a primary frequency modulation action signal sent by the speed regulating system, and the step 3 is carried out; and step 3: the monitoring system detects and diagnoses whether the primary frequency modulation acts, and if the primary frequency modulation does not act, the target value of the primary frequency modulation action amount is 0; if the primary frequency modulation action is carried out, calculating a primary frequency modulation action target value in real time according to a permanent mode frequency modulation difference coefficient ep and a frequency difference delta f, wherein the delta f is 1-f/50, and the calculating method comprises the following steps: the primary frequency modulation action target value is delta f/ep. Entering the step 4;
and 4, step 4: the monitoring system calculates an active power target value which is an AGC command issued by the AGC of the power plant and a primary frequency modulation action target value, and then the step 5 is carried out;
and 5: and (3) an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time, and the step 1 is returned.
As shown in fig. 2(1) and 2(2), an AGC and primary frequency modulation cooperative control system for a power plant in an opening mode includes:
a monitoring system and a speed regulating system;
the monitoring system receives an AGC command issued by AGC of a power plant, receives a unit frequency signal and a primary frequency modulation action signal sent by a speed regulating system, collects an active power signal output by the unit in real time for generating power and outputs a rapid pulse regulation command;
the monitoring system calculates a primary frequency modulation action target value according to the unit frequency and the performance requirement of the power grid on primary frequency modulation, and the primary frequency modulation action target value is superposed on an AGC command issued by an AGC of a power plant to generate an active power target value;
and an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time.
The power plant monitoring system is divided into a plant station layer and a site control unit layer on the whole level. The site control unit layer is connected with the power station control network, and the site monitoring task of the specified equipment is completed by adopting a field bus technology.
The monitoring system is characterized in that the site control unit layer is distributed according to controlled object units and consists of site control units (LCU) of the whole plant, and the site control units comprise LCU of each unit, LCU of service power, public LCU, LCU of switch station and LCU of dam crest. Each Local Control Unit (LCU) includes a PLC, a touch screen, network equipment, a cabinet, etc., and is responsible for equipment data acquisition and processing, equipment status monitoring and process monitoring, equipment control and adjustment, and equipment information communication. The equipment comprises speed regulating system equipment.
The speed regulating system of the power plant collects signals of the rotating speed, the opening degree of the guide vane, active power and the like of the unit, and the opening degree of the guide vane of the unit is controlled by adopting a closed-loop control mode, so that the rotating speed and the power of the unit are controlled. In the control process of the speed regulating system, the frequency of the unit and a primary frequency modulation action signal are detected and are uploaded to the monitoring system.
The active pulse adjusting system of the monitoring system is specifically an LCU active pulse adjusting system of a hydropower station unit in the prior art, and has application number CN 201610327273.6. An LCU active pulse adjusting system of a hydropower station unit comprises a unit active target value obtaining module, a power adjusting mode obtaining module, an opening mode initial value obtaining module through an interpolation algorithm, a pulse width adjusting module through a modified proportion algorithm and a unit active monitoring module. According to the invention, an interpolation algorithm is applied according to the variation of the water head of the hydropower station, the initial value of the opening mode is calculated, the initial value comprises the active current value of the unit, the adjustment target value, the adjustment dead zone value and the pulse adjustment proportionality coefficient K value, and the power pulse width is calculated by applying a correction proportionality algorithm. The active power pulse regulation and regulation system for the LCU of the hydropower station unit is provided for the first time, and the requirements of the large hydropower station monitoring system on the quick stability and reliability of the active regulation of the unit are met.
After the invention is applied to a field, in order to verify the mutual relation of the power plant AGC and primary frequency modulation matched control in an opening degree mode, a logic test of the power plant AGC and primary frequency modulation matched control is carried out, and the test process is as follows:
under the opening mode, the power is put into a closed loop, the AGC of the power plant initially sends out a value of 550MW, the frequency of the analog unit is stepped to 50.25Hz, the primary frequency modulation action is carried out, the target value of the primary frequency modulation action is 80MW, the AGC of the power plant sends out a new set load of 650MW, the active power of the final unit is stabilized at 570MW, and the test waveform is shown in figure 3. According to the analysis of the test waveform, the test result of the embodiment is normal, the mutual matching relationship between the power plant AGC and the primary frequency modulation is good, the effect of the primary frequency modulation is not influenced by the new value issued by the power plant AGC to disappear, the effect superposition is perfectly realized, no contradiction conflict occurs, and the adjustment purpose is achieved.
Claims (2)
1. A power plant AGC and primary frequency modulation cooperation control method in an opening degree mode is characterized by comprising the following steps:
step 1: the monitoring system detects whether the opening degree mode of the speed regulating system exists, if so, the step 2 is carried out; otherwise, adopting a non-opening mode power plant AGC and primary frequency modulation matching control method;
step 2: the monitoring system detects the set frequency signal and the primary frequency modulation action signal sent by the speed regulation system, and the step 3 is carried out;
and step 3: the monitoring system detects and diagnoses whether the primary frequency modulation acts, and if the primary frequency modulation does not act, the target value of the primary frequency modulation action amount is 0; if the primary frequency modulation action is carried out, calculating a primary frequency modulation action target value in real time according to a permanent mode frequency modulation difference coefficient ep and a frequency difference delta f, wherein delta f =1-f/50, and the calculating method comprises the following steps: entering step 4 when the primary frequency modulation action target value = [ delta f/ep ];
and 4, step 4: the monitoring system calculates an active power target value = an AGC command issued by an AGC of a power plant and a primary frequency modulation action target value, and enters step 5;
and 5: and (3) an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time, and the step 1 is returned.
2. The utility model provides a power plant AGC and primary control system that cooperates under aperture mode which characterized in that includes: a monitoring system and a speed regulating system;
the monitoring system receives an AGC command issued by AGC of a power plant, receives a unit frequency signal and a primary frequency modulation action signal sent by a speed regulating system, collects an active power signal output by the unit in real time for generating power and outputs a rapid pulse regulation command;
the monitoring system calculates a primary frequency modulation action target value according to the unit frequency and the performance requirement of the power grid on primary frequency modulation, and the primary frequency modulation action target value is superposed on an AGC command issued by an AGC of a power plant to generate an active power target value;
and an active pulse adjusting system of the monitoring system issues an opening pulse adjusting instruction to the speed regulating system in real time according to the active power target value and an active power signal output by the unit in real time.
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Cited By (4)
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| CN113595103A (en) * | 2021-07-22 | 2021-11-02 | 中能智新科技产业发展有限公司 | New energy rapid frequency modulation system based on real-time communication network and control method thereof |
| CN114188992A (en) * | 2021-11-05 | 2022-03-15 | 华能澜沧江水电股份有限公司 | Compatible frequency modulation adjusting method for hydroelectric generating set |
| CN114188994A (en) * | 2021-11-05 | 2022-03-15 | 华能澜沧江水电股份有限公司 | Adjustment strategy for improving dynamic stability of primary frequency modulation adjustment process |
| CN114204609A (en) * | 2021-11-05 | 2022-03-18 | 华能澜沧江水电股份有限公司 | Primary frequency modulation transfer adjustment method based on active power adjustment dead zone |
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| CN114188994A (en) * | 2021-11-05 | 2022-03-15 | 华能澜沧江水电股份有限公司 | Adjustment strategy for improving dynamic stability of primary frequency modulation adjustment process |
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| CN114188994B (en) * | 2021-11-05 | 2024-01-19 | 华能澜沧江水电股份有限公司 | Adjusting method for improving dynamic stability of primary frequency modulation adjusting process |
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