CN116345575A - Hydropower plant automatic power generation control method based on multiple external voltage levels - Google Patents
Hydropower plant automatic power generation control method based on multiple external voltage levels Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 abstract description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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Abstract
The invention provides a hydropower plant automatic power generation control method based on multiple external voltage levels. The method comprises the following steps: setting a plurality of branch AGC systems, wherein the branch AGC systems are in one-to-one correspondence with a plurality of external voltage levels; setting a total plant AGC system, wherein the total plant AGC system is used for regulating and controlling the load of a branch plant AGC system or a generator set; in response to receiving a grid load command, the grid load command including a total load and a specified demand for each of the outgoing voltage levels; the specified demand includes a specified load and a specified electricity price; and analyzing the power grid load instruction, and regulating and controlling the power grid load instruction to each branch plant AGC system or generator set through the total plant AGC system. The invention solves the technical problem that the AGC system of the water power plant in the prior art is inconvenient to formulate the control strategy of the generator set for the external voltage level with the specified requirement.
Description
Technical Field
The invention relates to the technical field of automatic control of hydropower plants, in particular to an automatic power generation control method of a hydropower plant based on multiple external voltage levels.
Background
The problems of the existing hydropower plants such as geographical positions, positions in the power grid, power consumption requirements of the power grid system, large number of generator sets and the like are solved, and the hydropower plants have two or more lines with external voltage levels. For example, a hydropower plant has four generator sets, wherein the external voltage level of two generator sets is 220KV; the external voltage level of the other two generator sets is 500KV;
in the prior art, the AGC system of the water power plant only meets the requirement of receiving a load instruction and load distribution work of a power grid system; when the power grid sets different appointed demands for the external voltage of each grade, the appointed demands comprise different internet power prices of the external voltage grades and different loads of the external voltage grades; the existing AGC system of the hydropower plant is inconvenient to formulate a control strategy of a generator set for the external voltage level with specified requirements.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides an automatic power generation control method for a hydropower plant based on multiple external voltage levels, which solves the technical problem that an AGC system of the hydropower plant in the prior art is inconvenient to formulate a control strategy of a generator set for the external voltage levels with specified requirements.
The invention relates to a hydropower plant automatic power generation control method based on multiple external voltage levels, which comprises the following steps:
setting a plurality of branch AGC systems, wherein the branch AGC systems are in one-to-one correspondence with a plurality of external voltage levels; setting a total plant AGC system, wherein the total plant AGC system is used for regulating and controlling the load of a branch plant AGC system or a generator set;
in response to receiving a grid load command, the grid load command including a total load and a specified demand for each of the outgoing voltage levels; the specified demand includes a specified load and a specified electricity price;
and analyzing the power grid load instruction, and regulating and controlling the power grid load instruction to each branch plant AGC system or generator set through the total plant AGC system.
Further, analyzing the power grid load command, and regulating the power grid load command to each branch plant AGC system or generator set through the total plant AGC system, including:
acquiring operation data of a current running generator set; based on the operation data and the power grid load command, confirming whether the specified requirements corresponding to the regulated external voltage levels meet a first preset condition or not;
if not, judging whether the appointed requirement corresponding to each regulated external voltage level meets a second preset condition;
if yes, after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put into the AGC system of the main plant, and the AGC system of the main plant regulates and controls the load of each branch plant AGC system according to a power grid load instruction; each branch plant AGC system regulates and controls the load of a corresponding generator set according to the power grid load instruction;
if not, after all the generator sets which are in grid-connected operation are put into the AGC function, putting the branch plant AGC system corresponding to the external voltage level with the specified requirement into the main plant AGC system; the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load instruction; and each branch plant AGC system regulates and controls the load of the corresponding generator set according to the power grid load instruction.
Further, the second preset condition includes:
the designated electricity price of each external voltage level is different from the standard electricity price;
and/or a specified load exists for each of the outgoing voltage levels.
Further, when the specified requirement corresponding to each regulated external voltage level does not meet the second preset condition, the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load command, including:
the general plant AGC system sets a fixed load mode for a branch plant AGC system or a generator set with a specified load;
the general plant AGC system sets a non-fixed load mode for the branch plant AGC system or the generator set without the designated load; the non-fixed load mode includes a priority mode, a normal mode, and a non-priority mode; the method comprises the steps that a total plant AGC system sets a priority mode for a branch plant AGC system with a designated electricity price higher than a standard electricity price; the general factory AGC system sets a conventional mode for a directly regulated generator set and a factory branch AGC system with a designated electricity price equal to a standard electricity price; the total plant AGC system sets a non-priority mode for the branch plant AGC system that specifies a lower power rate than the standard power rate.
Further, when the specified requirement corresponding to each regulated external voltage level meets a second preset condition, the total plant AGC system regulates and controls the load of each branch plant AGC system according to the power grid load command, including:
when the designated power price of each external voltage level is different from the standard power price and at least one designated load corresponding to the external voltage level does not exist;
confirming the priority of each external voltage level corresponding to the branch AGC system based on the appointed electricity price of each external voltage level;
the total plant AGC system regulates the load of each plant AGC based on the priority of each plant AGC system.
Further, before the total plant AGC system regulates the load of each plant AGC based on the priority of each plant AGC system, the method further comprises: the part of the grid load command that specifies the load is subtracted.
Further, the first preset condition includes:
the designated electricity price of each external voltage level is the same;
and no load is specified for any of the external voltage levels.
Further, when the specified requirement corresponding to each regulated external voltage level meets the first preset condition, the method includes:
after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put out, and then put into a general plant AGC system, and the general plant AGC system regulates and controls the load of each generator set according to a power grid load instruction.
Further, the priority mode includes priority load increase and hysteresis load decrease.
Further, the non-priority mode includes a priority load decrease and a hysteresis load increase.
Compared with the prior art, the invention has the following beneficial effects:
in the embodiment, by setting the branch plant AGC system for each external voltage level, when a set under each external voltage level has a specified requirement in a power grid load instruction, the generator set can be independently controlled to operate according to a preset strategy, each branch plant AGC system operates under a master plant AGC system, and the power grid load instruction is regulated and controlled to each branch plant AGC system or the generator set by the master plant AGC system; the power generator set under the external voltage level without the specified requirement directly regulates and controls the load by the AGC system of the total plant; the whole hydropower plant load regulation and control process is more reasonable, and the running economic value is higher. The technical problem that the AGC system of the water power plant in the prior art is inconvenient to formulate a control strategy of the generator set for the external voltage level with specified requirements is solved.
Drawings
Fig. 1 is a process step diagram of embodiment 1 of the present invention.
Fig. 2 is a system block diagram of embodiment 2 of the present invention.
Fig. 3 is a system block diagram of embodiment 3 of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1, a hydropower plant automatic power generation control method based on multiple external voltage levels, the method comprising:
s1: setting a plurality of branch AGC systems, wherein the branch AGC systems are in one-to-one correspondence with a plurality of external voltage levels; setting a total plant AGC system, wherein the total plant AGC system is used for regulating and controlling the load of a branch plant AGC system or a generator set;
in this embodiment, a plurality of branch AGC systems are set, and each branch AGC system corresponds to an external voltage level; for example, a hydropower plant has two external voltage levels of 220KV and 500KV; setting two branch AGC systems to correspond to two external voltage levels of 220KV and 500KV one by one respectively; the embodiment also sets a total plant AGC system, and the control level of the total plant AGC system is higher than that of the branch plant AGC system; the generator set in this embodiment may be set to operate under the AGC system of the branch plant after being put into the AGC function, or may be set to operate under the AGC system of the general plant directly.
S2: in response to receiving a grid load command, the grid load command including a total load and a specified demand for each of the outgoing voltage levels; the specified demand includes a specified load and a specified electricity price;
the specified requirements of the power grid for different outgoing voltage levels at different times may be different; the specified demand includes a specified load and a specified electricity price; for example, in one embodiment the specified power rate for a 500KV out-voltage level is 0.33 yuan/kWh, and a 100MW force, i.e., specified load, is guaranteed to be 100MW; the appointed electricity price of 220KV external voltage level is 0.35 yuan/kilowatt-hour, and no appointed load exists.
S3: and analyzing the power grid load instruction, and regulating and controlling the power grid load instruction to each branch plant AGC system or generator set through the total plant AGC system.
The implementation process of the embodiment comprises the following steps:
in the embodiment, by setting the branch AGC system for each external voltage level, when a set under each external voltage level has a specified requirement in a power grid load instruction, the generator set can be independently controlled to operate according to a preset strategy, and the preset strategy at least comprises one of avoiding a vibration interval and avoiding an inoperable interval; each branch plant AGC system operates under the general plant AGC system, and the general plant AGC system regulates and controls the power grid load instruction to each branch plant AGC system or the generator set; the power generator set under the external voltage level without the specified requirement directly regulates and controls the load by the AGC system of the total plant; the whole hydropower plant load regulation and control process is more reasonable, and the running economic value is higher. The technical problem that the AGC system of the water power plant in the prior art is inconvenient to formulate a corresponding control strategy according to the external voltage level with specified requirements is solved.
Example 2:
as shown in fig. 2, there are a plurality of analysis grid load instructions, which are regulated to each branch plant AGC system or generator set by the general plant AGC system, including:
acquiring operation data of a current running generator set; based on the operation data and the power grid load command, confirming whether the specified requirements corresponding to the regulated external voltage levels meet a first preset condition or not; the first preset condition includes: the designated power rates for each of the outgoing voltage levels are the same, and there is no designated load for any of the outgoing voltage levels.
If yes, after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put out, and then put into a general plant AGC system, and the general plant AGC system regulates and controls the load of each generator set according to a power grid load instruction; when the appointed electricity prices corresponding to all the external voltage levels are the same and each external voltage level has no appointed load; all the generator sets are directly subjected to load regulation and control by an AGC system of a general plant; the AGC system of the branch plants is avoided from being regulated, so that the regulation efficiency is higher.
If not, judging whether the appointed requirement corresponding to each regulated external voltage level meets a second preset condition; the second preset condition in this embodiment includes: the designated electricity price of each external voltage level is different from the standard electricity price; and/or a specified load exists for each of the outgoing voltage levels.
After the regulated and controlled appointed requirements corresponding to the external voltage levels meet a second preset condition, after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put into the AGC system, and then the branch plant AGC systems are put into the main plant AGC system, and the load of each branch plant AGC system is regulated and controlled by the main plant AGC system according to a power grid load instruction; each branch plant AGC system regulates and controls the load of a corresponding generator set according to the power grid load instruction; for example, as shown in fig. 3, the general factory AGC system is put into a branch factory AGC system 1, a branch factory AGC system 2 and a branch factory AGC system 3; the power generator set F11 and the power generator set F12 are put into the branch plant AGC system 1; not put into the process; a generator set F21 and a generator set F22 are put into the branch plant AGC system 2; the sub-factory AGC system 3 is put into a generator set F31 and a generator set F32. When the specified load corresponding to each external voltage level exists, the specified load corresponding to each external voltage level is adjusted.
The total plant AGC system regulates and controls the load of each branch plant AGC system according to the power grid load instruction, and the total plant AGC system comprises:
when the designated power price of each external voltage level is different from the standard power price and at least one designated load corresponding to the external voltage level does not exist;
confirming the priority of each external voltage level corresponding to the branch AGC system based on the appointed electricity price of each external voltage level;
the total plant AGC system regulates the load of each plant AGC based on the priority of each plant AGC system. It should be noted that before the total factory AGC system regulates and controls the load of each factory AGC based on the priority of each factory AGC system, the method further comprises: the part of the grid load command that specifies the load is subtracted. The mode of adjustment can maximize the benefit of power generation under the condition of meeting the load requirement of the power grid. The higher the designated electricity price, the higher the corresponding outgoing voltage level.
Example 3:
when the appointed requirements corresponding to the regulated external voltage levels do not meet the second preset condition, after all the generator sets which are in grid-connected operation are put into an AGC function, putting into a branch plant AGC system corresponding to the external voltage level with the appointed requirements, and putting into a general plant AGC system; the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load instruction; and each branch plant AGC system regulates and controls the load of the corresponding generator set according to the power grid load instruction. As shown in fig. 3, the plant AGC system is put into a branch plant AGC system 2, a branch plant AGC system 3, a generator set F11 and a generator set F12; the branch AGC system 1 is not put into operation; a generator set F21 and a generator set F22 are put into the branch plant AGC system 2; the sub-factory AGC system 3 is put into a generator set F31 and a generator set F32.
The implementation process of the embodiment comprises the following steps:
in this embodiment, the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load command, including:
the general plant AGC system sets a fixed load mode for a branch plant AGC system or a generator set with a specified load;
the general plant AGC system sets a non-fixed load mode for the branch plant AGC system or the generator set without the designated load; the non-fixed load mode includes a priority mode, a normal mode, and a non-priority mode; the method comprises the steps that a total plant AGC system sets a priority mode for a branch plant AGC system with a designated electricity price higher than a standard electricity price; the general factory AGC system sets a conventional mode for a directly regulated generator set and a factory branch AGC system with a designated electricity price equal to a standard electricity price; the total plant AGC system sets a non-priority mode for the branch plant AGC system that specifies a lower power rate than the standard power rate.
In this embodiment, the priority mode includes priority increasing load and hysteresis decreasing load; the non-priority mode includes a priority load decrease and a hysteresis load increase. The regular mode includes operation according to a preset strategy. The preset strategy at least comprises one of avoiding a vibration interval and avoiding an inoperable interval; each branch plant AGC system operates under the general plant AGC system, and the general plant AGC system regulates and controls the power grid load instruction to each branch plant AGC system or the generator set; the power generator set under the external voltage level without the specified requirement directly regulates and controls the load by the AGC system of the total plant; the whole hydropower plant load regulation and control process is more reasonable, and the running economic value is higher.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A hydropower plant automatic power generation control method based on multiple external voltage levels is characterized in that: the method comprises the following steps:
setting a plurality of branch AGC systems, wherein the branch AGC systems are in one-to-one correspondence with a plurality of external voltage levels; setting a total plant AGC system, wherein the total plant AGC system is used for regulating and controlling the load of a branch plant AGC system or a generator set;
in response to receiving a grid load command, the grid load command including a total load and a specified demand for each of the outgoing voltage levels; the specified demand includes a specified load and a specified electricity price;
and analyzing the power grid load instruction, and regulating and controlling the power grid load instruction to each branch plant AGC system or generator set through the total plant AGC system.
2. The hydropower plant automatic power generation control method based on multiple external voltage levels as claimed in claim 1, wherein: analyzing the power grid load command, regulating and controlling the power grid load command to each branch plant AGC system or generator set through the total plant AGC system, and comprising the following steps:
acquiring operation data of a current running generator set; based on the operation data and the power grid load command, confirming whether the specified requirements corresponding to the regulated external voltage levels meet a first preset condition or not;
if not, judging whether the appointed requirement corresponding to each regulated external voltage level meets a second preset condition;
if yes, after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put into the AGC system of the main plant, and the AGC system of the main plant regulates and controls the load of each branch plant AGC system according to a power grid load instruction; each branch plant AGC system regulates and controls the load of a corresponding generator set according to the power grid load instruction;
if not, after all the generator sets which are in grid-connected operation are put into the AGC function, putting the branch plant AGC system corresponding to the external voltage level with the specified requirement into the main plant AGC system; the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load instruction; and each branch plant AGC system regulates and controls the load of the corresponding generator set according to the power grid load instruction.
3. The hydropower plant automatic power generation control method based on multiple external voltage levels as claimed in claim 2, wherein: the second preset condition includes:
the designated electricity price of each external voltage level is different from the standard electricity price;
and/or a specified load exists for each of the outgoing voltage levels.
4. A hydropower plant automatic power generation control method based on multiple external voltage levels as claimed in claim 3, wherein: when the specified requirement corresponding to each regulated external voltage level does not meet the second preset condition, the total plant AGC system regulates and controls the load of the corresponding generator set or the branch plant AGC system according to the power grid load command, and the method comprises the following steps:
the general plant AGC system sets a fixed load mode for a branch plant AGC system or a generator set with a specified load;
the general plant AGC system sets a non-fixed load mode for the branch plant AGC system or the generator set without the designated load; the non-fixed load mode includes a priority mode, a normal mode, and a non-priority mode; the method comprises the steps that a total plant AGC system sets a priority mode for a branch plant AGC system with a designated electricity price higher than a standard electricity price; the general factory AGC system sets a conventional mode for a directly regulated generator set and a factory branch AGC system with a designated electricity price equal to a standard electricity price; the total plant AGC system sets a non-priority mode for the branch plant AGC system that specifies a lower power rate than the standard power rate.
5. A hydropower plant automatic power generation control method based on multiple external voltage levels as claimed in claim 3, wherein: when the specified requirement corresponding to each regulated external voltage level meets a second preset condition, the total plant AGC system regulates and controls the load of each branch plant AGC system according to the power grid load command, and the method comprises the following steps:
when the designated power price of each external voltage level is different from the standard power price and at least one designated load corresponding to the external voltage level does not exist;
confirming the priority of each external voltage level corresponding to the branch AGC system based on the appointed electricity price of each external voltage level;
the total plant AGC system regulates the load of each plant AGC based on the priority of each plant AGC system.
6. The hydropower plant automatic power generation control method based on multiple external voltage levels according to claim 5, wherein: before the total plant AGC system regulates the load of each plant AGC based on the priority of each plant AGC system, the system further comprises: the part of the grid load command that specifies the load is subtracted.
7. The hydropower plant automatic power generation control method based on multiple external voltage levels as claimed in claim 2, wherein: the first preset condition includes:
the designated electricity price of each external voltage level is the same;
and no load is specified for any of the external voltage levels.
8. The hydropower plant automatic power generation control method based on multiple external voltage levels according to claim 7, wherein: when the specified requirement corresponding to each regulated external voltage level meets a first preset condition, the method comprises the following steps:
after all the generator sets which are in grid-connected operation are put into an AGC function, all the branch plant AGC systems are put out, and then put into a general plant AGC system, and the general plant AGC system regulates and controls the load of each generator set according to a power grid load instruction.
9. The hydropower plant automatic power generation control method based on multiple external voltage levels according to claim 4, wherein: the priority mode includes a priority increasing load and a hysteresis decreasing load.
10. The hydropower plant automatic power generation control method based on multiple external voltage levels according to claim 4, wherein: the non-priority mode includes a priority load decrease and a hysteresis load increase.
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