CN114336740A - Hydropower station unit isolated network operation grouping adjusting system and method - Google Patents
Hydropower station unit isolated network operation grouping adjusting system and method Download PDFInfo
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Abstract
The hydropower station unit isolated network operation group adjusting system and method comprise a power grid and an isolated network load which are connected with the hydropower station, wherein the isolated network load is connected with the power grid, the isolated network load is powered by the power grid at ordinary time, when the hydropower station and the power grid break down, the hydropower station and the isolated network load form isolated network operation, 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 performs frequency adjustment and load distribution, the speed regulators of all the units do not enter frequency adjustment, multiple units can form group joint adjustment under the condition of abnormal fluctuation of isolated network frequency, and the problem of mutual interference is effectively eliminated.
Description
Technical Field
The invention relates to the field of small power grid regulation and control, in particular to a hydropower station unit isolated grid operation group adjusting system and method.
Background
The power supply mode of small power stations along the shore of rivers is single, and the anti-power grid fault capability is weak, and the isolated network condition often takes place in extreme weather, especially in summer thunderstorm weather. The regulating capacity of the small water turbine generator set is extremely tested at the moment. When the isolated network runs, the main task of the power grid is changed from load adjustment to isolated network frequency adjustment, and because the load of the isolated network is too small, under the condition that a plurality of units run in parallel, the speed regulators of the units frequently act, the units interfere with each other, the phenomena of overlarge power grid frequency fluctuation, unit sawing, unit phase modulation running and the like are easily generated. For example, in 2014-2016, the situation that all sets are disconnected due to the fact that a small power grid is switched due to external faults and the speed regulator cannot be stably controlled causes the situation to be obviously improved after multiple times of modification and optimization, but the situation still occurs under the condition that the frequency greatly fluctuates.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hydropower station unit isolated network operation group regulation system and a hydropower station unit isolated network operation group regulation method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the isolated network operation group adjusting system of the hydropower station unit comprises a power grid and an isolated network load which are connected with the hydropower station, wherein the isolated network load is connected with the power grid, the isolated network load is powered by the power grid at ordinary time, when the hydropower station and the power grid break down, the isolated network operation is formed by the hydropower station and the isolated network load, 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 group adjusting controller detects the system frequency, the system load power, the closing position of a breaker of each water turbine unit, the assembling of each water turbine unit, the frequency of each water turbine unit, the fault information of each water turbine unit and the opening degree information of each water turbine unit, the water turbine unit is divided into a base load unit and a frequency modulation unit, and the unit is adjusted according to the frequency difference between the system frequency and the standard frequency of 50 Hz.
The hydropower stations are a plurality of cascade hydropower stations, and the speed regulators of the hydraulic turbine units in the cascade hydropower stations are in communication connection with the grouped adjustment controller.
The output end of the group regulation controller sends an active load distribution instruction and a frequency increase and decrease instruction to the speed regulators of the hydraulic turbine units.
The group regulation controller is connected with a communication exchanger, and the communication exchanger is connected with the hydropower station LCU, the speed regulators of the hydraulic turbine units and the interpersonal interactive screen.
The group adjusting method of the hydropower station unit isolated network operation group adjusting system comprises the following adjusting steps:
step one, a group regulation controller judges whether a phenomenon of isolated network switching occurs or not by detecting the connection condition of a turbine unit and a power grid in a hydropower station, and enters step two when the isolated network occurs;
step two, the block regulation controller checks the closing position of a breaker between the water turbine unit and the isolated network load, the rotating speed of the unit and the redundancy of the opening degree of a guide vane of the unit to judge the number of the load units;
step three, the group regulation controller checks the fault information of the load units, the fault units are used as base loads to operate,
step four, distributing the total amount of the basic load and the total amount of the frequency modulation load according to the total amount of the current isolated network load, dividing the hydraulic turbine unit into a basic load unit and a frequency modulation unit, and distributing the basic load total amount and the frequency modulation load total amount to the corresponding basic load unit and the corresponding frequency modulation unit;
step five, the group regulation 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;
and step six, the group regulation controller sets a speed regulator frequency dead zone of each unit with the 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 the base load unit and the frequency modulation unit form a load unit according to the combination of N +2, wherein the N units stably carry fixed base loads, N is more than or equal to 4, the 2 units carry the same-size loads for over-frequency adjustment, and when the load adjustment space of the frequency modulation unit is insufficient, the base load reducing unit is automatically switched 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, wherein when X is a positive value:
when the frequency of 0.3Hz is less than X is less than 0.5Hz, controlling the guide vane opening of one set in the frequency modulation set to perform frequency reduction operation, and controlling the other set to perform frequency modulation standby, wherein the base load set is kept unchanged;
when the frequency is more than 0.5Hz and less than X and less than 1.0Hz, the guide vane opening degree of one set in the frequency modulation set is controlled to change in a stepped mode to perform stepped frequency reduction, the other set is used for frequency modulation standby, and the base load set increases the corresponding base load set according to the total base load of 1/4 to control the guide vane opening degree to perform frequency reduction operation;
when the frequency of 1.0Hz is less than X <2.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 1/2 by the base load unit, wherein the guide vane opening degree of the base load unit of 1/2 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/2 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 2.0Hz is less than X <3.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 3/4 by the base load unit, wherein the guide vane opening degree of the base load unit of 2/3 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/3 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 3.0Hz is less than X <5.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency reduction, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency reduction, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency reduction;
when 5.0Hz < X, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency reduction, the other unit is controlled to perform frequency modulation for standby, all the base load units are used for frequency modulation, and all the guide vane opening degrees of the base load units are changed in a stepped mode to perform stepped frequency reduction.
In the fifth step, when X is a negative value:
when-0.5 Hz < X < -0.3Hz, controlling the guide vane opening of one set in the frequency modulation set to make frequency increasing maneuvering, and controlling the other set to make frequency modulation standby, and keeping the base load set unchanged;
when the frequency of the base load unit is less than minus 0.5Hz, the base load unit controls the guide vane opening of the corresponding base load unit to be increased according to the total base load amount of 1/4 to perform frequency increasing maneuver;
when the frequency of the power grid is-2.0 Hz and X is less than-1.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 1/2 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 1/2 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/2 to perform frequency increase;
when the frequency of the power grid is-3.0 Hz and X is less than-2.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 3/4 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 2/3 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/3 to perform frequency increase;
when the frequency of the power grid is minus 5.0Hz < X < -3.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increasing, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency increasing, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency increasing;
when the frequency of the base load unit is higher than the X value of minus 5.0Hz, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency increase, the other unit is controlled to perform frequency modulation for standby, the base load unit is used for frequency modulation, and the guide vane opening degree of the base load unit is controlled to be changed in a stepped mode to perform stepped frequency increase.
The hydropower station unit isolated network operation group adjusting system and method provided by the invention have the following beneficial effects:
1. the control can be immediately intervened at the moment that the frequency of the rotating isolated network greatly vibrates, the monitoring system can reliably quit the active power regulation closed loop, and the isolated network frequency is stabilized within 50 +/-0.3 Hz within 3 regulation periods;
2. the main control machine can analyze the state of the existing six 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 quitted from the group regulation when the unit has a fault, and the unit can be automatically brought into the group regulation when the 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 according to the present invention;
FIG. 2 is a schematic view of a connection structure of a hydraulic turbine unit according to the present invention;
FIG. 3 is a schematic diagram of the regulation control system connection of the present invention;
FIG. 4 is a schematic diagram of input and output signal connections of units No. 1-3 in the group regulation controller according to the embodiment;
FIG. 5 is a schematic diagram of the connection of analog input signals of the units No. 1-3 in the block regulation controller according to the embodiment;
FIG. 6 is a schematic diagram of input and output signal connections of the unit No. 4-6 in the block regulation controller according to the embodiment.
Wherein: the system comprises a hydropower station 1, a power grid 2, an isolated grid load 3, a water turbine set 4, a speed regulator 5 and a grouped adjustment controller 6.
Detailed Description
For the purposes of promoting a better understanding of the objects, features, and advantages of the invention, reference will now be made to the following detailed description that is to be read in connection with the accompanying drawings, in which it is to be understood that the embodiments described are only a part of the disclosure, rather than all, and all other embodiments that may be obtained by one skilled in the art without the use of the teachings herein are within the scope of the disclosure.
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 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 at ordinary time, when the hydropower station 1 is disconnected from the power grid 2 due to a fault, the hydropower station 1 and the isolated network load 3 form an isolated network operation, 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 assembling 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 guide vanes of each water turbine unit, divides the water turbine unit into a base load unit and a frequency modulation unit, and regulates the unit according to the frequency difference between the system frequency and the standard frequency of 50Hz, the water turbine set is divided into a base load and a frequency modulation load through the group adjusting controller 6, the base load is provided with a stable load and is not adjusted under normal conditions, and the frequency modulation load is adjusted when frequency difference occurs, so that the number of the set of actions is reduced, and the phenomena of mutual interference, overlarge power grid frequency fluctuation, set sawing, set phase modulation operation and the like are avoided.
As shown in fig. 1 and 2, the hydropower station 1 is a plurality of cascade hydropower stations, and the speed regulators 5 of the water turbine set 4 in the cascade hydropower stations are in communication connection with the group regulation controller 6.
The output end of the group regulation controller 6 sends an active load distribution instruction and a frequency increase and decrease instruction to the speed regulators 5 of the hydraulic turbine units 4.
The group regulation controller 6 is connected with a communication exchanger, and the communication exchanger is connected with the hydropower station 1LCU, the hydraulic turbine unit speed regulators 5 and the interpersonal interactive screen.
The group adjusting method of the hydropower station unit isolated network operation group adjusting system comprises the following adjusting steps:
step one, the group regulation controller 6 judges whether a grid-turning and isolated phenomenon occurs or not by detecting the connection condition of the water turbine set 4 and the power grid 2 in the hydropower station 1, and enters step two when the isolated grid occurs;
step two, the group adjusting controller 6 checks the closing position of a circuit breaker between the water turbine set 4 and the isolated network load 3, the rotating speed of the set and the opening redundancy of guide vanes of the set to judge the number of the load sets;
step three, the group regulation controller 6 checks the fault information of the load units, and the fault units are used as base loads to operate;
the unit with serious faults can be protected to stop, normally stop or artificially stop, and the unit can be operated as a base load by default under the condition of no stop
Step four, distributing the total amount of the base load and the total amount of the frequency modulation load according to the total amount of the current isolated network load 3, dividing the hydraulic turbine unit 4 into a base load unit and a frequency modulation unit, and distributing the base load total amount and the frequency modulation load total amount to the corresponding base load unit and the corresponding frequency modulation unit;
step five, the group regulation 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;
and step six, the group regulation controller 6 sets a speed regulator frequency dead zone of each unit with the 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 and frequency modulation is carried out, the adjustment of the guide vane opening degree can bring about the response increase and decrease of the system frequency, so that the frequency modulation unit has a high response characteristic.
And the base load unit and the frequency modulation unit form a load unit according to the combination of N +2, wherein the N units stably carry fixed base loads, N is more than or equal to 4, the 2 units carry the same-size loads for over-frequency adjustment, and when the load adjustment space of the frequency modulation unit is insufficient, the base load reducing unit is automatically switched to the frequency modulation unit.
As shown in table 1, six units form an isolated network, the 1# and 2# units are set as frequency modulation load units, the 3# to 6# units are set as base load units, and in the fifth step, the specific method for 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, wherein when X is a positive value:
when the frequency of 0.3Hz is less than X is less than 0.5Hz, controlling the guide vane opening of one set in the frequency modulation set to perform frequency reduction operation, and controlling the other set to perform frequency modulation standby, wherein the base load set is kept unchanged;
when the frequency is more than 0.5Hz and less than X and less than 1.0Hz, the guide vane opening degree of one set in the frequency modulation set is controlled to change in a stepped mode to perform stepped frequency reduction, the other set is used for frequency modulation standby, and the base load set increases the corresponding base load set according to the total base load of 1/4 to control the guide vane opening degree to perform frequency reduction operation;
when the frequency of 1.0Hz is less than X <2.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 1/2 by the base load unit, wherein the guide vane opening degree of the base load unit of 1/2 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/2 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 2.0Hz is less than X <3.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 3/4 by the base load unit, wherein the guide vane opening degree of the base load unit of 2/3 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/3 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 3.0Hz is less than X <5.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency reduction, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency reduction, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency reduction;
when 5.0Hz < X, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency reduction, the other unit is controlled to perform frequency modulation for standby, all the base load units are used for frequency modulation, and all the guide vane opening degrees of the base load units are changed in a stepped mode to perform stepped frequency reduction.
TABLE 1 adjustment method with frequency difference as timing
As shown in table 2, in the fifth step, when X is a negative value:
when-0.5 Hz < X < -0.3Hz, controlling the guide vane opening of one set in the frequency modulation set to make frequency increasing maneuvering, and controlling the other set to make frequency modulation standby, and keeping the base load set unchanged;
when the frequency of the base load unit is less than minus 0.5Hz, the base load unit controls the guide vane opening of the corresponding base load unit to be increased according to the total base load amount of 1/4 to perform frequency increasing maneuver;
when the frequency of the power grid is-2.0 Hz and X is less than-1.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 1/2 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 1/2 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/2 to perform frequency increase;
when the frequency of the power grid is-3.0 Hz and X is less than-2.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 3/4 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 2/3 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/3 to perform frequency increase;
when the frequency of the power grid is minus 5.0Hz < X < -3.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increasing, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency increasing, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency increasing;
when the frequency of the base load unit is higher than the X value of minus 5.0Hz, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency increase, the other unit is controlled to perform frequency modulation for standby, the base load unit is used for frequency modulation, and the guide vane opening degree of the base load unit is controlled to be changed in a stepped mode to perform stepped frequency increase.
TABLE 2 adjustment method with frequency difference as timing
As shown in table 3, the collective regulation controller 6 automatically sets the governor frequency dead zone for each unit with a base load, the frequency dead zone being set in terms of the step frequency difference absolute value span.
TABLE 3 frequency dead band setting
Claims (9)
1. The isolated network operation group adjusting system of the hydropower station unit is characterized by comprising a power grid (2) and an isolated network load (3) which are connected with the 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) at ordinary time, when the hydropower station (1) and the power grid (2) are disconnected due to faults, 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 adjusting controller (6), the group adjusting controller (6) detects the system frequency, the system load power, the combined brake position of each water turbine unit breaker, the assembling of each water turbine unit, the frequency of each water turbine unit, the fault information of each water turbine unit and the opening degree information of each water turbine unit, and dividing the hydraulic turbine set into a base load set and a frequency modulation set, and adjusting the sets according to the frequency difference between the system frequency and the standard frequency of 50 Hz.
2. The hydropower station unit isolated network operation group regulation system according to claim 1, wherein the hydropower station (1) is a plurality of cascade hydropower stations, and the speed regulators (5) of the hydroelectric generating units (4) in the cascade hydropower stations are in communication connection with the group regulation controller (6).
3. The isolated network operation block regulation system of hydropower units according to claim 2, wherein the output end of the block regulation controller (6) sends an active load distribution instruction and a frequency increase and decrease instruction to the speed regulators (5) of the hydraulic turbine units (4).
4. The isolated network operation group regulation system of hydropower station unit according to claim 3, wherein the group regulation controller (6) is connected with a communication exchanger, and the communication exchanger is connected with the LCU of the hydropower station (1), the speed regulators (5) of the hydraulic turbine units and an interpersonal interaction screen.
5. Group regulation method using the hydropower station unit isolated network operation group regulation system of claim 4, characterized in that the step of regulating is:
step one, a group regulation controller (6) judges whether a grid isolated switching phenomenon 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 enters step two when the isolated grid occurs;
step two, the block regulation controller (6) checks the closing position of a breaker between the water turbine unit (4) and the isolated network load (3), the rotating speed of the unit and the redundancy of the opening degree of a guide vane of the unit to judge the number of the load units;
step three, the group regulation controller (6) checks the fault information of the load unit, the fault unit is used as a base load to operate,
fourthly, distributing the total base load amount and the total frequency modulation load amount according to the total amount of the current isolated network load (3), dividing the hydraulic turbine unit (4) into a base load unit and a frequency modulation unit, and distributing the base load amount and the total frequency modulation load amount to the corresponding base load unit and the corresponding frequency modulation unit;
step five, the group regulation 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;
and step six, the group regulation controller (6) sets a speed regulator frequency dead zone of each set with the base load, and the frequency dead zone is set according to the step span.
6. The hydropower station unit isolated network operation group adjusting method according to claim 5, wherein in the fourth step, the total frequency modulation load is more than 70% of the total capacity of the frequency modulation unit.
7. The hydropower station unit isolated network operation group adjusting method according to claim 6, wherein the step four of the base load units and the frequency modulation unit form a load unit according to the combination of N +2, wherein the N units stably carry fixed base loads, N is more than or equal to 4, the 2 units carry the same-size loads for over-frequency adjustment, and when the load adjusting space of the frequency modulation unit is insufficient, the base load reducing unit is automatically switched to the frequency modulation unit.
8. The isolated network operation group adjustment method for the hydropower station unit according to claim 7, wherein 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, wherein when X is a positive value:
when the frequency of 0.3Hz is less than X is less than 0.5Hz, the guide vane opening of one set in the frequency modulation set is controlled to perform frequency reduction maneuvering, the other set performs frequency modulation standby, and the base load set is kept unchanged;
when the frequency is more than 0.5Hz and less than X and less than 1.0Hz, the guide vane opening degree of one set in the frequency modulation set is controlled to change in a stepped mode to perform stepped frequency reduction, the other set is used for frequency modulation standby, and the base load set increases the corresponding base load set according to the total base load of 1/4 to control the guide vane opening degree to perform frequency reduction operation;
when the frequency of 1.0Hz is less than X <2.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 1/2 by the base load unit, wherein the guide vane opening degree of the base load unit of 1/2 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/2 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 2.0Hz is less than X <3.0Hz, controlling the guide vane opening degree of one unit in the frequency modulation unit to perform step frequency reduction, controlling the other unit to perform frequency modulation standby, and increasing the corresponding base load unit to perform frequency modulation according to the total base load of 3/4 by the base load unit, wherein the guide vane opening degree of the base load unit of 2/3 in the increased frequency modulation base load unit performs step frequency reduction, and the base load unit of 1/3 controls the guide vane opening degree to perform frequency reduction maneuver;
when the frequency of 3.0Hz is less than X <5.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency reduction, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency reduction, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency reduction;
when 5.0Hz < X, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency reduction, the other unit is controlled to perform frequency modulation for standby, all the base load units are used for frequency modulation, and all the guide vane opening degrees of the base load units are changed in a stepped mode to perform stepped frequency reduction.
9. The hydropower station unit isolated network operation group adjusting method according to claim 8, wherein in the fifth step, when X is a negative value:
when the frequency is minus 0.5Hz and X is minus 0.3Hz, the guide vane opening of one set in the frequency modulation set is controlled to carry out frequency increasing operation, the other set is used for frequency modulation standby, and the base load set is kept unchanged;
when the frequency of the base load unit is less than minus 0.5Hz, the base load unit controls the guide vane opening of the corresponding base load unit to be increased according to the total base load amount of 1/4 to perform frequency increasing maneuver;
when the frequency of the power grid is-2.0 Hz and X is less than-1.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 1/2 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 1/2 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/2 to perform frequency increase;
when the frequency of the power grid is-3.0 Hz and X is less than-2.0 Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increase, controlling the other machine set to perform frequency modulation standby, and increasing the corresponding base load machine set to perform frequency modulation according to the total base load of 3/4 by the base load machine set, wherein the guide vane opening degree of the base load machine set of 2/3 in the increased frequency modulation base load machine set performs step frequency increase, and the guide vane opening degree is controlled by the base load machine set of 1/3 to perform frequency increase;
when the frequency of the power grid is minus 5.0Hz < X < -3.0Hz, controlling the guide vane opening degree of one machine set in the frequency modulation machine set to perform step frequency increasing, controlling the other machine set to perform frequency modulation standby, and controlling the base load machine set to perform frequency modulation completely, wherein the guide vane opening degree of the base load machine set of 3/4 performs step frequency increasing, and the base load machine set of 1/4 controls the guide vane opening degree to perform frequency increasing;
when the frequency of the base load unit is higher than the X value of minus 5.0Hz, the guide vane opening degree of one unit in the frequency modulation unit is controlled to be changed in a stepped mode to perform stepped frequency increase, the other unit is controlled to perform frequency modulation for standby, the base load unit is used for frequency modulation, and the guide vane opening degree of the base load unit is controlled to be changed in a stepped mode to perform stepped frequency increase.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505859A (en) * | 2014-12-29 | 2015-04-08 | 吴位跃 | Method for using speed regulators during hydropower station isolated network operation linkage grid-connected power generation |
| CN105743107A (en) * | 2016-04-19 | 2016-07-06 | 南京南瑞集团公司 | Control method for frequency regulation of electric power isolated network system |
| WO2017071230A1 (en) * | 2015-10-30 | 2017-05-04 | 南京南瑞集团公司 | Method for short-term optimal scheduling of multi-agent hydropower station group |
| CN108879784A (en) * | 2018-08-07 | 2018-11-23 | 中国华电科工集团有限公司 | The control method of unit frequency stability is improved in a kind of Isolated Network System |
| CN112713610A (en) * | 2020-12-22 | 2021-04-27 | 哈尔滨广瀚燃气轮机有限公司 | Isolated grid power station power management method |
-
2021
- 2021-12-15 CN CN202111537575.3A patent/CN114336740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505859A (en) * | 2014-12-29 | 2015-04-08 | 吴位跃 | Method for using speed regulators during hydropower station isolated network operation linkage grid-connected power generation |
| WO2017071230A1 (en) * | 2015-10-30 | 2017-05-04 | 南京南瑞集团公司 | Method for short-term optimal scheduling of multi-agent hydropower station group |
| CN105743107A (en) * | 2016-04-19 | 2016-07-06 | 南京南瑞集团公司 | Control method for frequency regulation of electric power isolated network system |
| CN108879784A (en) * | 2018-08-07 | 2018-11-23 | 中国华电科工集团有限公司 | The control method of unit frequency stability is improved in a kind of Isolated Network System |
| CN112713610A (en) * | 2020-12-22 | 2021-04-27 | 哈尔滨广瀚燃气轮机有限公司 | Isolated grid power station power management method |
Non-Patent Citations (1)
| Title |
|---|
| 牟进国;李杰;: "水轮机调速器分段调节在孤网运行中的应用", 水电站机电技术, no. 1 * |
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