CN114336740B - Group adjusting system and method for isolated network operation of hydropower station unit - Google Patents
Group adjusting system and method for isolated network operation of hydropower station unit Download PDFInfo
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Abstract
The isolated network operation group adjusting system and method for the hydropower station unit comprises a power grid and isolated network loads connected with the hydropower station, wherein the isolated network loads are connected with the power grid, the isolated network loads are supplied by the power grid in normal time, when the hydropower station breaks down with the power grid, the isolated network operation is formed by the hydropower station and the isolated network loads, a water turbine unit in the hydropower station is electrically connected with a speed regulator, the speed regulator is in communication connection with a group adjusting controller, the main controller is used for frequency adjustment and load distribution, the speed regulator of each unit does not enter into frequency adjustment, multiple units can form group adjustment under the condition that the isolated network frequency abnormally fluctuates, and the interference problem among the units is effectively eliminated.
Description
Technical Field
The invention relates to the field of small-sized power grid regulation, in particular to a hydropower station unit isolated network operation group regulation system and method.
Background
The small power station along the river bank has single power supply mode and weak power grid fault resistance, and the isolated grid condition occurs frequently in extreme weather, particularly in summer thunderstorm weather. The adjustment capability of the small-sized hydroelectric generating set is extremely tested at the moment. When the isolated grid operates, the main task of the power grid is changed from load adjustment to regulation of the isolated grid frequency, and because the load of the isolated grid is too small, under the condition that a plurality of units operate in parallel, the speed regulators of the units frequently act, the units are mutually interfered, and phenomena of overlarge fluctuation of the power grid frequency, sawing of the units, phase modulation operation of the units and the like are easily generated. For example, in 2014-2016, the hydropower station of Yangyang county in Hubei province changes the small power grid every year due to external faults, the speed regulator cannot control the events which lead to complete disconnection of the unit, and after the events are modified and optimized for many times, the situation is obviously improved, but under the condition of great fluctuation of frequency, the situation still occurs.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system and a method for adjusting the isolated network operation of a hydropower station unit in groups, which are characterized in that a main controller is used for carrying out frequency adjustment and load distribution, and each unit speed regulator does not enter into frequency adjustment, so that multiple units form group joint adjustment under the condition that the isolated network frequency abnormally fluctuates, and the interference problem among the units is effectively eliminated.
In order to solve the technical problems, the invention adopts the following technical scheme:
the isolated network operation group adjusting system of the hydropower station unit comprises a power grid and isolated network loads connected with the hydropower station, wherein the isolated network loads are connected with the power grid, the isolated network loads are supplied with power by the power grid in normal time, when the hydropower station breaks down with the power grid, the isolated network operation is formed by the hydropower station and the isolated network loads, the hydropower station unit in the hydropower station is electrically connected with a speed regulator, the speed regulator is in communication connection with a group adjusting controller, the group adjusting controller detects the system frequency, the system load power, the switching-on position of a breaker of each hydropower station, the beam assembly of each hydropower station, the frequency of each hydropower station, the fault information of each hydropower station and the opening information of guide vanes of each hydropower station, and the hydropower station is divided into a base load unit and a frequency modulation unit, so that the hydropower station is adjusted according to the frequency difference between the system frequency and the standard frequency of 50 Hz.
The hydropower station is a plurality of cascade hydropower stations, and the speed regulator of the water turbine unit in the cascade hydropower station is in communication connection with the group regulation controller.
The output end of the group adjusting controller sends out an active load distribution instruction and a frequency increasing and decreasing instruction to the speed regulator of each water turbine unit.
The group adjusting controller is connected with a communication switch, and the communication switch is connected with the hydropower station LCU, each water turbine set speed regulator and the interpersonal interaction screen.
The group adjusting method for the group adjusting system operated by the isolated network of the hydropower station unit comprises the following adjusting steps:
step one, a group regulation controller judges whether a phenomenon of switching the isolated network occurs or not by detecting the connection condition of a water turbine set and a power grid in a hydropower station, and when the isolated network occurs, the step two is entered;
step two, checking the switching-on position of a breaker between the hydraulic turbine unit and the isolated network load, the rotating speed of the unit and the opening degree redundancy of guide vanes of the unit by using a group regulation controller to judge the number of the loaded units;
step three, the group adjusting controller checks the fault information of the load unit, the faulty unit is used as a base load to operate,
distributing the total base load and the total frequency modulation load according to the total current isolated network load, dividing the water turbine into a base load unit and a frequency modulation unit, and distributing the total base load and the total frequency modulation load to the corresponding base load unit and frequency modulation unit;
step five, the group adjusting controller executes different frequency modulation strategies according to the frequency difference value of the current isolated network system frequency and the standard frequency of 50 Hz;
step six, setting a frequency dead zone of a speed regulator of each unit with a base load by using a group regulation controller, wherein the frequency dead zone is set according to a step span.
In the fourth step, the total frequency modulation load is greater than 70% of the total capacity of the frequency modulation unit.
And in the fourth step, the base load unit and the frequency modulation unit form a load unit according to the combination of N+2, wherein N units are stable and have fixed base loads, N is more than or equal to 4,2 units have the same-size load and carry out frequency adjustment, and when the load adjustment space of the frequency modulation unit is insufficient, the base load unit is automatically reduced and is transferred to the frequency modulation unit.
In the fifth step, the specific method of frequency modulation is as follows:
defining the frequency difference between the frequency of the isolated network system and the standard frequency of 50Hz as X, and when X is a positive value:
when 0.3Hz < X <0.5Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency reduction maneuver, and the other unit to perform frequency modulation standby, wherein the base load unit is kept unchanged;
when 0.5Hz < X <1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency reduction maneuver;
when 1.0Hz < X <2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency reduction maneuver;
when 2.0Hz < X <3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of the 2/3 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/3 base load unit is controlled to perform frequency reduction maneuver;
when 3.0Hz < X <5.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load unit and the base load unit perform stepped frequency reduction, and 1/4 of the base load unit and the base load unit control the opening degree of the guide vane to perform frequency reduction maneuver;
when 5.0Hz < X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation, wherein the base load unit is used for frequency modulation, and the opening degree of the guide vane of the base load unit is used for stepped frequency reduction in all the stepped change.
In the fifth step, when X is a negative value:
when-0.5 Hz < X < -0.3Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency-increasing maneuver, and the other unit to perform frequency modulation for standby, wherein the base load unit is kept unchanged;
when-1.0 Hz < X < -0.5Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency increase maneuver;
when-2.0 Hz < X < -1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the increased frequency modulation base load unit is used as stepped frequency increase, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency increase maneuver;
when-3.0 Hz < X < -2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of 2/3 of the added frequency modulation base load unit is used as stepped frequency increase, and the opening degree of the guide vane of 1/3 of the base load unit is controlled to perform frequency increase maneuver;
when-5.0 Hz < X < -3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load units and the base load units perform stepped frequency increase, and 1/4 of the base load units control the opening degree of the guide vane to perform frequency increase maneuver;
when-5.0 Hz is more than X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit is used for frequency modulation, wherein all the base load units perform frequency modulation, and all the opening degree of the guide vane of the base load unit perform stepped change to perform stepped frequency increase.
The group regulation system and method for the isolated network operation of the hydropower station unit provided by the invention have the following beneficial effects:
1. the active regulation closed loop of the monitoring system can be immediately intervened and controlled at the moment of large oscillation of the frequency of switching the isolated network, and the isolated network frequency is stabilized within 50+/-0.3 Hz in 3 regulation periods;
2. the main controller can perform state analysis on the six existing speed regulators in real time, distinguish a shutdown unit, a fault unit and a normal operation unit, and automatically group the units;
3. in the isolated network operation process, the fault unit can be automatically withdrawn from the group for adjustment when the fault unit is in fault, and the unit can be automatically brought into the group for adjustment when the fault unit is put into operation.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a grid system connection in accordance with the present invention;
FIG. 2 is a schematic diagram of the connection structure of the water turbine set according to the present invention;
FIG. 3 is a schematic diagram of the connection of the regulating control system of the present invention;
FIG. 4 is a schematic diagram of the input/output signal connections of the units 1-3 in the group adjustment controller according to an embodiment;
FIG. 5 is a schematic diagram of analog input signal connections of units 1-3 in a group adjustment controller according to an embodiment;
FIG. 6 is a schematic diagram of the input/output signal connections of the units No. 4-6 in the group adjustment controller according to the embodiment.
Wherein: the power station 1, the power grid 2, the isolated network load 3, the water turbine set 4, the speed regulator 5 and the group regulation controller 6.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present invention more apparent, the following description of the specific technical solutions of the present invention will be given in a complete system with reference to the accompanying drawings provided according to the present invention, and it is apparent that the described embodiments are some, but not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without making any creative effort are included in the scope of protection of the present invention based on the embodiments of the present invention.
As shown in fig. 1 and 2, the isolated network operation group regulation system of the hydropower station unit comprises a power grid 2 and an isolated network load 3 which are connected with the hydropower station 1, the isolated network load 3 is connected with the power grid 2, the isolated network load 3 is supplied by the power grid 2 in normal time, when the hydropower station 1 breaks down with the power grid 2, the isolated network operation is formed by the hydropower station 1 and the isolated network load 3, the hydropower station 4 in the hydropower station 1 is electrically connected with a speed regulator 5, the speed regulator 5 is in communication connection with a group regulation controller 6, the group regulation controller 6 detects the system frequency, the system load power, the switching-on position of each water turbine unit, the beam loading of each water turbine unit, the frequency of each water turbine unit, the fault information of each water turbine unit and the opening information of each water turbine unit, the base load unit and the frequency modulation unit, the unit regulation is carried out according to the frequency difference between the system frequency and the standard frequency of 50Hz, the base load is stabilized, the saw load is not regulated under normal conditions, the frequency difference frequency adjustment is carried out when the frequency difference is carried out, the frequency adjustment is carried out, the number of the saw units between the power grid is reduced, the frequency of the saw units is reduced, the interference phenomenon of the power units is avoided, and the phenomenon of the operation of the power unit is avoided, and the interference phenomenon is caused.
As shown in fig. 1 and 2, the hydropower station 1 is a plurality of cascade hydropower stations, and a speed regulator 5 of a water turbine set 4 in the cascade hydropower station is in communication connection with a group regulation controller 6.
The output end of the group adjusting controller 6 sends out an active load distribution instruction and a frequency increasing and decreasing instruction to the speed regulator 5 of each water turbine unit 4.
The group regulation controller 6 is connected with a communication switch, and the communication switch is connected with the LCU of the hydropower station 1, the speed regulators 5 of all the water turbine sets and the interpersonal interaction screen.
The group adjusting method for the group adjusting system operated by the isolated network of the hydropower station unit comprises the following adjusting steps:
step one, a group regulation controller 6 judges whether a phenomenon of switching the isolated network occurs or not by detecting the connection condition of a water turbine set 4 and a power grid 2 in the hydropower station 1, and when the isolated network occurs, the step two is entered;
step two, checking the switching-on position of a breaker between the hydraulic turbine unit 4 and the isolated network load 3, the rotating speed of the unit and the opening degree redundancy of guide vanes of the unit by a group adjusting controller 6 to judge the number of load units;
step three, the group regulation controller 6 checks fault information of the load unit, and the faulty unit is used as a base load to operate;
the machine set with serious faults can be protected to stop, normally stop or manually stop, and defaults to base load operation under the condition of no stop
Distributing the total base load and the total frequency modulation load according to the total current isolated network load 3, dividing the hydro-turbine unit 4 into a base load unit and a frequency modulation unit, and distributing the total base load and the total frequency modulation load to the corresponding base load unit and frequency modulation unit;
step five, the group adjusting controller 6 executes different frequency modulation strategies according to the frequency difference value of the current isolated network system frequency and the standard frequency of 50 Hz;
step six, the group adjusting controller 6 sets a frequency dead zone of a speed regulator of each unit with a base load, and the frequency dead zone is set according to the step span.
In the fourth step, the total frequency modulation load is greater than 70% of the total capacity of the frequency modulation unit, and when the condition is met, the adjustment of the opening degree of the guide vane can bring about the response increase and decrease of the system frequency, so that the frequency modulation unit has high response characteristics.
And in the fourth step, the base load unit and the frequency modulation unit form a load unit according to the combination of N+2, wherein N units are stable and have fixed base loads, N is more than or equal to 4,2 units have the same-size load and carry out frequency adjustment, and when the load adjustment space of the frequency modulation unit is insufficient, the base load unit is automatically reduced and is transferred to the frequency modulation unit.
As shown in table 1, six units form a isolated network to run, the 1# and 2# units are set as frequency modulation load units, the 3# -6# unit is set as base load unit, and in the fifth step, the specific method of frequency modulation is as follows: defining the frequency difference between the frequency of the isolated network system and the standard frequency of 50Hz as X, and when X is a positive value:
when 0.3Hz < X <0.5Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency reduction maneuver, and the other unit to perform frequency modulation standby, wherein the base load unit is kept unchanged;
when 0.5Hz < X <1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency reduction maneuver;
when 1.0Hz < X <2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency reduction maneuver;
when 2.0Hz < X <3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of the 2/3 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/3 base load unit is controlled to perform frequency reduction maneuver;
when 3.0Hz < X <5.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load unit and the base load unit perform stepped frequency reduction, and 1/4 of the base load unit and the base load unit control the opening degree of the guide vane to perform frequency reduction maneuver;
when 5.0Hz < X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation, wherein the base load unit is used for frequency modulation, and the opening degree of the guide vane of the base load unit is used for stepped frequency reduction in all the stepped change.
Table 1 method for adjusting the frequency difference to be positive
As shown in table 2, in the fifth step, when X is a negative value:
when-0.5 Hz < X < -0.3Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency-increasing maneuver, and the other unit to perform frequency modulation for standby, wherein the base load unit is kept unchanged;
when-1.0 Hz < X < -0.5Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency increase maneuver;
when-2.0 Hz < X < -1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the increased frequency modulation base load unit is used as stepped frequency increase, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency increase maneuver;
when-3.0 Hz < X < -2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of 2/3 of the added frequency modulation base load unit is used as stepped frequency increase, and the opening degree of the guide vane of 1/3 of the base load unit is controlled to perform frequency increase maneuver;
when-5.0 Hz < X < -3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load units and the base load units perform stepped frequency increase, and 1/4 of the base load units control the opening degree of the guide vane to perform frequency increase maneuver;
when-5.0 Hz is more than X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit is used for frequency modulation, wherein all the base load units perform frequency modulation, and all the opening degree of the guide vane of the base load unit perform stepped change to perform stepped frequency increase.
Table 2 method for adjusting the frequency difference to be positive
As shown in table 3, the group adjustment controller 6 automatically sets the frequency dead zone of the speed regulator of each unit with the base load, the frequency dead zone being set in accordance with the step absolute value span.
TABLE 3 frequency deadband setting
Claims (3)
1. A group adjusting method of a group adjusting system for isolated network operation of a hydropower station unit is characterized by comprising the following adjusting steps:
step one, a group adjusting controller (6) judges whether a phenomenon of switching isolated network occurs or not by detecting the connection condition of a water turbine set (4) and a power grid (2) in a hydropower station (1), and when the isolated network occurs, the step two is entered;
step two, checking the switching-on position of a breaker between the hydraulic turbine unit (4) and the isolated network load (3), the rotating speed of the unit and the opening degree redundancy of guide vanes of the unit by a group adjusting controller (6) to judge the number of load units;
step three, the group adjusting controller (6) checks the fault information of the load unit, the faulty unit is used as the base load to operate,
distributing the total base load and the total frequency modulation load according to the total current isolated network load (3), dividing the water turbine unit (4) into a base load unit and a frequency modulation unit, and distributing the total base load and the total frequency modulation load to the corresponding base load unit and frequency modulation unit;
step five, the group adjusting controller (6) executes different frequency modulation strategies according to the frequency difference value of the current isolated network system frequency and the standard frequency of 50 Hz;
step six, setting a speed regulator frequency dead zone of each unit with a base load by a group regulation controller (6), wherein the frequency dead zone is set according to a step span;
the system comprises a power grid (2) and a isolated network load (3) which are connected with a hydropower station (1), wherein the isolated network load (3) is connected with the power grid (2), the isolated network load (3) is powered by the power grid (2) in normal time, when the hydropower station (1) breaks down with the power grid (2), the isolated network operation is formed by the hydropower station (1) and the isolated network load (3), a water turbine unit (4) in the hydropower station (1) is electrically connected with a speed regulator (5), the speed regulator (5) is in communication connection with a group regulation controller (6), the group regulation controller (6) detects the system frequency, the system load power, the closing position of a breaker of each water turbine unit, the beam loading of each water turbine unit, the frequency of each water turbine unit, fault information of each water turbine unit and the opening information of guide vanes of each water turbine unit, and the water turbine unit is divided into a base load unit and a frequency modulation unit, and unit regulation is carried out according to the frequency difference between the system frequency and the standard frequency of 50 Hz;
the hydropower station (1) is a plurality of cascade hydropower stations, and a speed regulator (5) of a water turbine set (4) in the cascade hydropower stations is in communication connection with a group regulation controller (6);
the output end of the group adjusting controller (6) sends an active load distribution instruction and a frequency increasing and decreasing instruction to the speed regulator (5) of each water turbine unit (4);
the group regulation controller (6) is connected with a communication switch, and the communication switch is connected with LCU of the hydropower station (1), each water turbine group speed regulator (5) and the interpersonal interaction screen;
in the fifth step, the specific frequency modulation method comprises the following steps:
defining the frequency difference between the frequency of the isolated network system and the standard frequency of 50Hz as X, and when X is a positive value:
when 0.3Hz < X <0.5Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency reduction maneuver, and the other unit to perform frequency modulation standby, wherein the base load unit is kept unchanged;
when 0.5Hz < X <1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency reduction maneuver;
when 1.0Hz < X <2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency reduction maneuver;
when 2.0Hz < X <3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of the 2/3 base load unit in the increased frequency modulation base load unit is used as stepped frequency reduction, and the opening degree of the guide vane of the 1/3 base load unit is controlled to perform frequency reduction maneuver;
when 3.0Hz < X <5.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load unit and the base load unit perform stepped frequency reduction, and 1/4 of the base load unit and the guide vane control guide vane perform frequency reduction maneuver;
when 5.0Hz < X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency reduction, and the other unit is used for frequency modulation, wherein all the base load units perform frequency modulation, and all the opening degree of the guide vane of the base load unit perform stepped change to perform stepped frequency reduction;
in the fifth step, when X is a negative value:
when-0.5 Hz < X < -0.3Hz, controlling the opening degree of a guide vane of one unit in the frequency modulation unit to perform frequency-increasing maneuver, and the other unit to perform frequency modulation for standby, wherein the base load unit is kept unchanged;
when the frequency modulation unit is in a range of-1.0 Hz < X < -0.5Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency multiplication, and the other unit is used for frequency modulation for standby, wherein the base load unit increases the opening degree of the guide vane of the corresponding base load unit according to the total base load of 1/4 to perform frequency multiplication maneuver;
when-2.0 Hz < X < -1.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 1/2 to perform frequency modulation, the stepped change of the opening degree of the guide vane of the 1/2 base load unit in the frequency modulation base load unit is increased to perform stepped frequency increase, and the opening degree of the guide vane of the 1/2 base load unit is controlled to perform frequency increase maneuver;
when-3.0 Hz < X < -2.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein the base load unit increases the corresponding base load unit according to the total base load of 3/4 to perform frequency modulation, wherein the stepped change of the opening degree of the guide vane of 2/3 of the added frequency modulation base load unit is used as stepped frequency increase, and the opening degree of the guide vane of 1/3 of the base load unit is controlled to perform frequency increase maneuver;
when-5.0 Hz < X < -3.0Hz, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit to perform frequency modulation for standby, wherein 3/4 of the base load units and the base load units perform the frequency modulation, the stepped change of the opening degree of the guide vane of the base load unit is performed stepped frequency increase, and 1/4 of the base load units control the opening degree of the guide vane to perform frequency increase maneuver;
when-5.0 Hz is more than X, controlling the stepped change of the opening degree of the guide vane of one unit in the frequency modulation unit to perform stepped frequency increase, and the other unit is used for frequency modulation, wherein all the base load units perform frequency modulation, and all the opening degree of the guide vane of the base load unit perform stepped change to perform stepped frequency increase.
2. The method of claim 1, wherein in the fourth step, the total amount of the modulating load is greater than 70% of the total capacity of the modulating unit.
3. The group adjusting method according to claim 2, wherein the medium-base load unit and the frequency modulation unit in the fourth step form a load unit according to the combination of n+2, wherein N units are stable with fixed base loads, N is greater than or equal to 4,2 units are subjected to frequency adjustment with the same size load, and when the load adjustment space of the frequency modulation unit is insufficient, the automatic base reduction load unit is transferred to the frequency modulation unit.
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