CN112072714B - Online-calculation-based power system minimum startup mode optimization method - Google Patents
Online-calculation-based power system minimum startup mode optimization method Download PDFInfo
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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
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Abstract
The invention discloses an online calculation-based power system minimum startup mode optimization method, which comprises the following steps: acquiring real-time operation state data and model parameters of a power grid to form online calculation data of the power grid; setting the number of initial simulation shutdown generator sets and an initial value of a simulation reduction rotation reserve capacity coefficient; by sequentially stopping a specific number of generator sets and performing safety and stability assessment: if the requirement of safety and stability is met, updating the number of the shutdown generator sets and repeating the steps to determine the starting number of the minimum starting mode calculated on line; the rotating reserve capacity of the generator set is reduced through proportional simulation, and safety and stability evaluation is carried out: and if the safety and stability requirements are met, updating, simulating and reducing the rotating reserve capacity and repeating the steps to determine the rotating reserve capacity of each started generator set. The invention can reduce the constraint of the minimum starting mode determined by off-line calculation on the generator set, and improve the flexibility and the power supply capacity of the power grid operation mode.
Description
Technical Field
The invention belongs to the technical field of power grid dispatching operation control, and particularly relates to a power system minimum startup mode optimization method based on online calculation.
Background
When the load in a certain area increases to a certain extent, in order to maintain the voltage of a load point within a specified range, a certain number of starting units and a certain rotation standby capacity are generally required to be maintained, which is the reason of the minimum starting mode of a regional power grid. With the application and development of the ultra-high voltage direct current transmission technology, the power transmitted by direct current is continuously increased, and the influence on the accessed alternating current power grid is more obvious. The method mainly solves the problems of high frequency, high voltage and even power angle stability of a generator set caused by surplus power of a transmitting-end alternating current power grid when an extra-high voltage direct current lock is locked or large disturbance occurs to an alternating current power grid, and low frequency, low voltage and even voltage stability caused by power loss of a receiving-end alternating current power grid. In order to ensure the safety of the ac power grid at the transmitting end and the receiving end, on the basis of maintaining the minimum startup mode in each region, a certain number of startup units and a certain rotation reserve capacity need to be maintained in a larger range, such as a provincial power grid region.
At present, in the prior art, the minimum starting mode of the provincial power grid is determined by adopting off-line simulation calculation software and carrying out calculation analysis on a limited typical operation mode. The cycle of rechecking is long, usually once every half year. In order to be able to cover as much as possible the various operating conditions, typical operating modes often choose the most severe combinations of operating conditions that have ever occurred. The minimum starting mode obtained by the method is always conservative in actual operation, and has an optimized space in most of time.
Disclosure of Invention
The invention solves the technical problem that aiming at the defects of the prior art, the invention provides the power system minimum starting mode optimization method based on the online calculation, which can reduce the constraint of the minimum starting mode determined by the offline calculation on the generator set and improve the flexibility and the power supply capacity of the power grid operation mode.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a minimum startup mode optimization method of an electric power system based on online calculation comprises the following steps:
step 2, setting the number of the generator sets constrained by the minimum starting-up mode obtained by off-line calculation as N, the total rotating reserve capacity as P megawatts, the number of the initial simulation shutdown generator sets as i equal to 1, and the simulation reduction rotating reserve capacity coefficient as j equal to 1;
step 3, selecting i generator sets from the N generator sets to simulate shutdown, and carrying out operation comparison on the generator sets
The simulation shutdown mode is characterized in that safety and stability evaluation is carried out according to the online calculation data of the power grid: if it is not
If the simulation shutdown modes meet the safety and stability requirement, updating the number of the simulation shutdown generator sets to be i +1, then repeating the step 3 until the simulation shutdown modes do not meet the safety and stability requirement, if the i is 1, executing the step 4, and if the i is more than 1, executing the step 5
Step 4, calculating data on line according to the power grid, simulating and reducing the rotation reserve capacity of the current N generator sets by j x delta in proportion, and checking whether the generator sets subjected to the simulation reduction of the rotation reserve capacity meet the requirements of safety and stability: if the safety and stability requirements are met, updating the simulation rotation reduction spare capacity coefficient to j ═ j +1, and repeating the step 4 until the safety and stability requirements are not met, and executing the step 5;
and 5, determining the minimum starting-up mode optimization result of the power system calculated on line as follows: the number of the generator sets is N- (i-1), and the rotating reserve capacity of the generator sets is P (1- (j-1) delta) megawatts.
The minimum starting mode optimization only considers reducing the number of starting machines or reducing the rotating standby capacity of the generator set so as to reserve a certain safety margin.
Further, the real-time operation state data of the power grid comprises: the system comprises a power grid load, the output of each generator set, a main transformer, a line state and a switching state of reactive compensation equipment.
Further, the model parameters include: the system comprises load model parameters, generator set synchronous motor, excitation system and PSS, speed regulation system model parameters, transformer nameplate parameters and line actual measurement or typical parameters.
Further, δ is 10%.
Further, whether the generator set meets the safety and stability requirements is judged according to whether the power system after the fault can be recovered stably or not by traversing all the bus and the main transformer three-phase faults.
Further, the minimum power-on mode optimization is performed every five to fifteen minutes.
Advantageous effects
The invention forms the online calculation data of the power grid by regularly acquiring the real-time running state of the power grid, thereby regularly checking the minimum startup mode of the concerned power system, and when the power system has an optimization space, adjusting the power system from multiple aspects: the number of the starting units is reduced, or the rotating reserve capacity of the generator set is reduced, and the flexibility of the operation mode of the power grid and the power supply capacity can be improved while a certain safety margin is kept.
Drawings
Fig. 1 is a flowchart of a minimum startup mode optimization method of an electric power system based on online computing according to the present invention.
Detailed Description
The following describes embodiments of the present invention in detail, which are developed based on the technical solutions of the present invention, and give detailed implementation manners and specific operation procedures to further explain the technical solutions of the present invention.
The invention provides an optimization method of a minimum startup mode of an electric power system based on online calculation, which comprises the following steps as shown in figure 1:
wherein, the real-time running state data of electric wire netting includes: the system comprises a power grid load, the output of each generator set, main transformers, line states and the switching state of reactive compensation equipment; the model parameters include: the system comprises load model parameters, generator set synchronous motor, excitation system and PSS, speed regulation system model parameters, transformer nameplate parameters and line actual measurement or typical parameters.
Step 2, setting the number of the generator sets constrained by the minimum starting-up mode obtained by off-line calculation as N, the total rotating reserve capacity as P megawatts, the number of the initial simulation shutdown generator sets as i equal to 1, and the simulation reduction rotating reserve capacity coefficient as j equal to 1; the number of the generator sets constrained by the minimum starting-up mode obtained by off-line calculation is obtained by calculating by adopting the existing off-line simulation calculation software;
step 3, selecting i generator sets from the N generator sets to simulate shutdown, and carrying out operation comparison on the generator sets
The simulation shutdown mode is characterized in that safety and stability evaluation is carried out according to the online calculation data of the power grid: if it is not
If the simulation shutdown modes meet the safety and stability requirement, updating the number of the simulation shutdown generator sets to be i +1, then repeating the step 3 until the simulation shutdown modes do not meet the safety and stability requirement, if the i is 1, executing the step 4, and if the i is more than 1, executing the step 5;
step 4, calculating data on line according to the power grid, simulating and reducing the rotation reserve capacity of the current N generator sets by j x delta in proportion, and checking whether the generator sets with the reduced rotation reserve capacity meet the requirements of safety and stability or not: if the safety and stability requirements are met, updating the simulation rotation reduction spare capacity coefficient to j ═ j +1, and repeating the step 4 until the safety and stability requirements are not met, and executing the step 5; wherein, the value of δ may be δ 10%;
and 5, determining the minimum starting-up mode optimization result of the power system calculated on line as follows: the number of the generator sets is N- (i-1), and the rotating reserve capacity of the generator sets is P (1- (j-1) delta) megawatts.
And 3, performing safety and stability assessment related to the step 3 and the step 5 by adopting a transient stability checking method of online computing software in the prior art, traversing all bus and main transformer three-phase faults, and judging whether the generator set meets the safety and stability requirement according to whether the power system after the faults can recover to be stable.
The following parts take a certain provincial power grid as an example, the provincial power grid has extra-high voltage direct current transmission, and certain minimum starting number and rotation reserve capacity of the thermal power generating units in the load center are kept at different load levels according to the extra-high voltage direct current transmission power due to the voltage stability problem. The minimum boot-up requirement calculated off-line is shown in table 1.
TABLE 1 minimum startup mode requirement from some provincial level power grid offline calculation
Example 1:
if the maximum load of a certain day is 2100 ten thousand kilowatts, 1 more thermal power generating units are normally started on the basis of the minimum starting number required by the maximum direct current power in order to guarantee the consumption of clean energy, so that the direct current transmission power is not influenced after any thermal power generating unit is tripped due to faults. According to the requirements of table 1, 19 thermal power generating units are started on the day, and the maximum direct current transmission power can reach 400 ten thousand kilowatts.
If the actual load exceeds the predicted load to 2150 ten thousand kilowatts due to the fact that the temperature is higher, according to the requirements of the table 1, under the load level of the current gear, when the minimum starting time of the thermal power generating unit in the load center is 19 machines, the maximum power of direct current transmission is only 300 ten thousand kilowatts. Therefore, it is necessary to reduce the dc transmission power from 400 to 300 kw.
If the minimum starting-up mode optimization method is applied, when the actual load exceeds 2100 ten thousand kilowatts, the real-time running state data and the model parameters of the power grid are obtained, the online calculation data of the power grid is formed, the minimum starting-up mode of the power grid is checked at the moment, and whether the minimum starting-up mode obtained by offline calculation has the optimization space or not is evaluated. If the minimum starting mode of the thermal power generating unit with the direct current transmission of 400 ten thousand kilowatt hours can be reduced from 20 to 19, the direct current transmission power does not need to be reduced from 400 ten thousand kilowatts to 300 ten thousand kilowatts. Therefore, the external power receiving capacity of the provincial power grid is not reduced, and the stable operation of the power grid is guaranteed.
Example 2:
if the load level of the provincial power grid reaches 3100 thousands of kilowatts in a certain load peak period, the direct current transmission power is 400 thousands of kilowatts, and the power supply pressure is higher. According to the requirements of table 1, the minimum number of the power generating units in the load center is 24, and the minimum rotation reserve capacity is 300 ten thousand kilowatts.
By applying the minimum starting-up mode optimization method, the real-time running state data and the model parameters of the power grid are obtained, the online calculation data of the power grid are formed, the minimum starting-up mode of the power grid is checked at the moment, and whether the minimum starting-up mode obtained by offline calculation has the optimization space is evaluated. If the minimum rotating reserve capacity can be reduced from 300 to 270 million kilowatts, the output of the limited unit can be increased by 30 million kilowatts, so that the power supply capacity of a power grid is increased by 30 million kilowatts, and the power supply pressure is relieved.
The above embodiments are preferred embodiments of the present application, and those skilled in the art can make various changes or modifications without departing from the general concept of the present application, and such changes or modifications should fall within the scope of the claims of the present application.
Claims (6)
1. A minimum startup mode optimization method of an electric power system based on online calculation is characterized by comprising the following steps:
step 1, acquiring real-time operation state data and model parameters of a power grid to form online calculation data of the power grid;
step 2, setting the number of the generator sets constrained by the minimum starting-up mode obtained by off-line calculation as N, the total rotating reserve capacity as P megawatts, the number of the initial simulation shutdown generator sets as i equal to 1, and the simulation reduction rotating reserve capacity coefficient as j equal to 1;
step 3, selecting i generator sets from the N generator sets to simulate shutdown, and carrying out operation Ci NThe simulation shutdown mode is characterized in that safety and stability evaluation is carried out according to the online calculation data of the power grid: if C is presenti NIf the simulation shutdown modes meet the safety and stability requirement, updating the number of the simulation shutdown generator sets to be i +1, then repeating the step 3 until the simulation shutdown modes do not meet the safety and stability requirement, if the i is 1, executing the step 4, and if the i is more than 1, executing the step 5;
step 4, calculating data on line according to the power grid, simulating and reducing the rotation reserve capacity of the current N generator sets by j x delta in proportion, and checking whether the generator sets subjected to the simulation reduction of the rotation reserve capacity meet the requirements of safety and stability: if the safety and stability requirements are met, updating the simulation rotation reduction spare capacity coefficient to j ═ j +1, and repeating the step 4 until the safety and stability requirements are not met, and executing the step 5;
and 5, determining the minimum starting-up mode optimization result of the power system calculated on line as follows: the number of the generator sets is N- (i-1), and the rotating reserve capacity of the generator sets is P (1- (j-1) delta) megawatts.
2. The method of claim 1, wherein the grid real-time operating state data comprises: the system comprises a power grid load, the output of each generator set, a main transformer, a line state and a switching state of reactive compensation equipment.
3. The method of claim 1, wherein the model parameters comprise: the system comprises load model parameters, generator set synchronous motor, excitation system and PSS, speed regulation system model parameters, transformer nameplate parameters and line actual measurement or typical parameters.
4. The method of claim 1, wherein δ is 10%.
5. The method according to claim 1, wherein whether the generator set meets the safety and stability requirement is judged according to whether the power system after the fault can be recovered to be stable or not by traversing all the bus and main transformer three-phase faults.
6. The method of claim 1, wherein the minimal power-on optimization is performed every five to fifteen minutes.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102545208A (en) * | 2011-12-26 | 2012-07-04 | 东北电网有限公司 | Power grid running mode getting method based on frequency response |
| CN104242355A (en) * | 2014-09-19 | 2014-12-24 | 清华大学 | Wind-power-plant-having-access-to-power-grid position and capacity control method with minimum wind curtailment considered |
| CN104318323A (en) * | 2014-10-13 | 2015-01-28 | 华南理工大学 | Quick dispatching method for unit commitment considering reliability constraint |
| CN109088427A (en) * | 2018-07-23 | 2018-12-25 | 国网青海省电力公司经济技术研究院 | Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid |
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| CN103259285B (en) * | 2013-05-03 | 2015-04-29 | 国家电网公司 | Method for optimizing short running of electric power system comprising large-scale wind power |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545208A (en) * | 2011-12-26 | 2012-07-04 | 东北电网有限公司 | Power grid running mode getting method based on frequency response |
| CN104242355A (en) * | 2014-09-19 | 2014-12-24 | 清华大学 | Wind-power-plant-having-access-to-power-grid position and capacity control method with minimum wind curtailment considered |
| CN104318323A (en) * | 2014-10-13 | 2015-01-28 | 华南理工大学 | Quick dispatching method for unit commitment considering reliability constraint |
| CN109088427A (en) * | 2018-07-23 | 2018-12-25 | 国网青海省电力公司经济技术研究院 | Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid |
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