CN108964022B - Power coordination control method suitable for high-capacity microgrid - Google Patents
Power coordination control method suitable for high-capacity microgrid Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000002354 daily effect Effects 0.000 claims abstract description 36
- 238000010248 power generation Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 11
- 230000003203 everyday effect Effects 0.000 claims abstract description 11
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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
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H02J3/383—
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- H02J3/386—
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a power coordination control method suitable for a large-capacity microgrid, which comprises the following steps: the power rolling coordination control function module of the micro-grid energy management system calculates the current day electric quantity exchange control target according to the annual electric quantity exchange target and by combining the new energy power generation power and the power utilization load in the micro-grid; calculating the annual residual exchange electric quantity according to the finished daily electric quantity exchange control target on the current day, and performing rolling calculation every day; a new energy power supply sunrise curve is formulated according to a daily electric quantity exchange control target calculated in real time every day; and distributing the decomposed power to the AGC software functional modules of the new energy power stations through a telecontrol channel by a power decomposition strategy, and then adjusting the power generation power of the power generation equipment in real time by the AGC software functional modules of the new energy power stations. The method can realize the rolling layered power coordination control of the high-capacity microgrid and the annual exchange electric quantity with the main grid to be controlled below a target value, and improves the local consumption capability of new energy and the system stability of the microgrid.
Description
Technical Field
The invention belongs to the technical field of power dispatching and distribution network automation systems, and particularly relates to a power coordination control method suitable for a high-capacity microgrid.
Background
The traditional grid-connected microgrid has the following characteristics: 1) the voltage grade is low, generally 35 kilovolts and below; the system scale is small, the system capacity is not more than 20MW in principle, and the power supply mainly comprises renewable energy sources, mainly distributed photovoltaic, a fan and the like; 2) the frequency and voltage inside the microgrid are generally controlled by a microgrid central controller (MGCC), so that the stable operation of load electricity and electrical equipment is ensured; 3) the microgrid is mainly characterized in that energy is consumed on site, and annual exchange electric quantity between the microgrid and an external power grid is generally not more than 50% of annual electric quantity.
With the requirements of society and local economic development, the micro-grid construction also has some new changes and trends: 1) the micro-grid is no longer a small-capacity (20MW) power grid in the traditional sense, and a large-scale micro-grid (the installed capacity of new energy power generation is more than 100 MW) appears in inner Mongolia and other areas; 2) the total power generation capacity of new energy in the microgrid is generally much larger than the power load in the microgrid, so that the problem of sending a large amount of electric quantity to the main grid is easily caused; 3) the large-capacity microgrid is further required to control annual cumulative upper power transmission amount with the main grid to be less than a target value (for example, 25%) of annual total power generation amount, so as to reduce influence on the main grid.
The large-capacity microgrid is not a new energy power supply in the past any more, but a centralized photovoltaic power station, a wind power station and a photo-thermal power station are taken as main power sources, the capacity of a single power station is more than dozens of MW, each power station is provided with an automatic power control (AGC) software function, the AGC software is used for adjusting the active power output of power generation equipment, and the microgrid central controller is no longer suitable for power coordination control of the large-capacity microgrid. The large-capacity microgrid needs an effective technical method to solve the power coordination control problem of the microgrid, and the problem that the power exchange with the main grid meets the control target and reduces the influence on the main grid.
Disclosure of Invention
The invention aims to provide a power coordination control method suitable for a large-capacity microgrid, which can realize rolling layered power coordination control on the large-capacity microgrid and annual exchange electric quantity with a main grid to be controlled below a target value, and improve the local consumption capability of new energy and the system stability of the microgrid.
In order to achieve the above purpose, the solution of the invention is:
a power coordination control method suitable for a large-capacity microgrid comprises the following steps:
step 1, a micro-grid energy management system power rolling coordination control function module calculates a daily exchange electric quantity control target according to an exchange power control target constraint value and by combining new energy power generation power and power utilization load in a micro-grid;
step 2, according to the finished daily exchange electric quantity control target on the current day, calculating the annual residual exchange electric quantity, thereby correcting the future daily exchange electric quantity control target and performing rolling calculation every day;
step 3, a new energy power supply sunrise curve is formulated according to a daily exchange electric quantity control target calculated in real time every day;
and 4, distributing the decomposed power to the AGC software functional modules of the new energy power stations through a telecontrol channel according to the new energy power supply sunrise curve and a power decomposition strategy, and then adjusting the power generation power of the power generation equipment in real time by the AGC software functional modules of the new energy power stations.
In the step 1, the generated power needs to be calculated for all power generation types in the microgrid, including total generated power of photovoltaic, wind power, photo-thermal and the like, and the power utilization load needs to be calculated for all load types in the microgrid, including total load of industrial load, commercial load, residential load and the like.
And (3) performing power rolling correction in the step 2: and calculating a control value of the annual remaining exchange electric quantity according to the finished daily exchange electric quantity control actual value on the current day, thereby determining a daily exchange electric quantity control target value on the next day and performing rolling calculation every day.
A power output curve is established in the step 3: and according to the daily exchange electric quantity control target value, making a daily real-time output curve of 96-point or 288-point power supplies of the microgrid system.
The power hierarchical control in the step 4: and the power rolling coordination control function module distributes the decomposed power value of every 15 minutes or every 5 minutes to each new energy power station AGC software function module in real time through a telecontrol channel according to the new energy power supply sunrise curve and a power decomposition strategy, and then each new energy power station AGC software function module adjusts the power generation power of the power generation equipment in real time.
After the scheme is adopted, the invention has the beneficial effects that: a power coordination control method suitable for a large-capacity microgrid mainly solves the problems of internal power coordination control and power exchange control with a main network of the existing large-capacity microgrid (more than 100 MW), a Microgrid Energy Management System (MEMS) adopts an energy exchange daily rolling correction technology to decompose a total annual power exchange control target into a daily power exchange control target, corrects a future daily power exchange control target according to the finished daily power exchange control target, forms a daily output curve of a new energy power supply, performs power control decomposition by the daily output curve, issues the power to AGC (automatic power control) software function modules of new energy power stations such as photovoltaic power stations, photothermal power stations and wind power stations, adjusts the power generation power of power generation equipment such as photovoltaic inverters and fans by the AGC software function of the new energy power stations, ensures that the large capacity and the main network power exchange control are in a target range, the on-site consumption capacity of new energy and the system stability of the micro-grid are greatly improved, and the method has good use value and popularization significance.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a diagram of a power roll coordination control process.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a system block diagram of the present invention. The invention relates to a power coordination control method suitable for a high-capacity microgrid, which specifically comprises the following steps:
1. the microgrid energy management system power rolling coordination control function module exchanges an electric quantity target according to the year, and calculates an electric quantity exchange control target of the day by combining the new energy power generation power and the power utilization load in the microgrid; the generated power needs to be calculated for all power generation types in the microgrid, including total generated power of photovoltaic, wind power, photo-thermal and the like, and the electricity utilization load needs to be calculated for all load types in the microgrid, including total load of industrial load, commercial load, residential load and the like. The daily exchange electric quantity control target value calculation formula is as follows:
Mt＝∑Mc+(∑Me-∑Mc)*％Lt
wherein: mt represents the daily exchange electric quantity control target value of the day; sigma Me represents the total amount of electricity generation of the new energy power station in the same day; sigma Mc represents the total load of the day; % Lt represents the exchange power control target constraint value (e.g., 25%).
2. Calculating the annual residual exchange electric quantity according to the finished daily exchange electric quantity control target on the current day, so as to correct the future daily exchange electric quantity control target and perform rolling calculation every day; and calculating a control value of the annual remaining exchange electric quantity according to the finished daily exchange electric quantity control actual value on the current day, thereby determining a daily exchange electric quantity control target value on the next day and performing rolling calculation every day. The calculation formula of the target correction value of the exchange electric quantity in the future day is as follows:
Mt+1＝Mpt+△Mt
wherein: mt +1 represents a target correction value of the exchange electric quantity on the next day; mpt represents the target control value of the exchange electric quantity in the future day; Δ Mt represents the deviation between the target control value and the actual control value of the current switching capacity.
3. And (4) making a daily real-time output curve of 96 or 288 power supplies of the microgrid system on the day according to a daily exchange electric quantity control target calculated in real time every day.
4. And according to the sunrise curve of the new energy power supply, distributing the decomposed power value of every 15 minutes or every 5 minutes to AGC software functional modules of each new energy power station in real time through a telecontrol channel by a power decomposition strategy, and then adjusting the power generation power of the power generation equipment in real time by the AGC software functional modules of each new energy power station. The power decomposition calculation formula in the power decomposition strategy is as follows:
Ppi＝Pci*(Pti/∑Pti)
wherein: ppi represents a power transmission regulation value of a new energy power station at a certain moment (15 minutes or 5 minutes); pci represents the total output curve power value at a certain moment; pti represents the adjustable power total value of a new energy power station at a certain moment; and Σ Pti represents the adjustable power sum of all new energy power stations at a certain moment.
FIG. 2 is a diagram of a power roll coordination control process. As shown in the figure, firstly, a total annual electric quantity exchange control target is decomposed into a daily exchange electric quantity control target, and the energy exchange target is decomposed; performing rolling correction on the energy exchange target according to the completed daily exchange electric quantity control target correction (delta MW) for the future daily exchange electric quantity control target; and (3) formulating a sunrise curve of the new energy power supply according to the daily exchange electric quantity control target, formulating the new energy power supply output curve, distributing the decomposed power to the AGC software functional modules of the new energy power stations through the telecontrol channel, and then adjusting the power generation power of the power generation equipment in real time by the AGC software functional modules of the new energy power stations. And power coordination control on the large-capacity microgrid and annual exchange electric quantity control with the main grid are finished below a target value through rolling correction and hierarchical control.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (5)
1. A power coordination control method suitable for a large-capacity microgrid is characterized by comprising the following steps:
step 1, a micro-grid energy management system power rolling coordination control function module calculates a daily exchange electric quantity control target according to an exchange power control target constraint value and by combining new energy power generation power and power utilization load in a micro-grid:
Mt＝∑Mc+(∑Me-∑Mc)*％Lt
wherein: mt represents the daily exchange electric quantity control target value of the day; sigma Me represents the total amount of electricity generation of the new energy power station in the same day; sigma Mc represents the total load of the day; % Lt represents the exchange power control target constraint value;
step 2, according to the finished daily exchange electric quantity control target on the current day, calculating the annual residual exchange electric quantity, thereby correcting the future daily electric quantity exchange control target and performing rolling calculation every day;
step 3, a new energy power supply sunrise curve is formulated according to a daily exchange electric quantity control target calculated in real time every day;
and 4, distributing the decomposed power to the AGC software function modules of the new energy power stations through a telecontrol channel according to the new energy power supply sunrise curve and a power decomposition strategy, and adjusting the power generation power of the power generation equipment in real time by the AGC software function modules of the new energy power stations, wherein the power decomposition calculation formula in the power decomposition strategy is as follows:
Ppi＝Pci*(Pti/∑Pti)
wherein: ppi represents a power transmission regulation value of a certain new energy power station at a certain moment; pci represents the total output curve power value at a certain moment; pti represents the adjustable power total value of a new energy power station at a certain moment; and Σ Pti represents the adjustable power sum of all new energy power stations at a certain moment.
2. The power coordination control method suitable for large-capacity microgrid according to claim 1, characterized in that: in step 1, the power generation power meter and all power generation types in the microgrid, and the power utilization load meter and all load types in the microgrid are used.
3. The power coordination control method suitable for large-capacity microgrid according to claim 1, characterized in that: the step 2 further comprises the following steps: and calculating a control value of the annual remaining exchange electric quantity according to the finished daily exchange electric quantity control actual value on the current day, thereby determining a daily exchange electric quantity control target value on the next day and performing rolling calculation every day.
4. The power coordination control method suitable for large-capacity microgrid according to claim 1, characterized in that: in the step 3, a power supply day real-time output curve of the microgrid system at 96 or 288 points in the day is worked out according to the daily exchanged electric quantity control target value.
5. The power coordination control method suitable for large-capacity microgrid according to claim 1, characterized in that: in the step 4, the power rolling coordination control function module distributes the decomposed power value of every 15 minutes or every 5 minutes to each new energy power station AGC software function module in real time through a telecontrol channel according to the new energy power supply sunrise curve and a power decomposition strategy, and then each new energy power station AGC software function module adjusts the power generation power of the power generation equipment in real time.
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