CN107706918B - New energy and power grid matched power supply method and calibration device thereof - Google Patents
New energy and power grid matched power supply method and calibration device thereof 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
- H02J3/04—Circuit arrangements for AC mains or AC distribution networks for connecting networks of the same frequency but supplied from different sources
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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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- 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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Abstract
The invention discloses a method for supplying power by matching new energy with a power grid, which comprises the following steps of a, judging whether the running state of a local power grid meets the condition before power failure; the current local power grid comprises a microgrid and a power grid; b. establishing an equivalent mathematical model according to the current local power grid; c. solving the equivalent mathematical model to obtain the power supply capacity of the current local power grid, comparing and judging the power supply capacity with the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not; d. when the power transfer requirement exists, the input of new energy is allocated, and the power transfer is carried out according to the output power transfer path by matching with the power grid. The invention can solve the technical problem of matching of multi-source power supply and can quickly meet the switching of power supply paths.
Description
Technical Field
The invention belongs to the field of new energy, and particularly relates to a new energy and power grid matched power supply method and a calibration device thereof.
Background
At present, the functions of the microgrid are gradually integrated into life, solar power generation and wind power generation in the microgrid all use natural clean energy and play an important role in saving energy and protecting the environment, however, the power system fault is inevitable due to severe environmental factors such as rainstorm, heavy snow, strong wind and the like, and congestion of the power equipment and the communication channel which are old day by day. The main future power supply mode is to supply power through the microgrid system and the power system, and when the power supply system is matched with the microgrid for power supply, how to adopt a rapid mode to form power supply for faults of the power system is a problem which needs to be solved and a difficult problem which needs to be solved.
Disclosure of Invention
Therefore, in order to solve the above problems, the present invention provides a method for supplying power by matching new energy with a power grid, which comprises the following steps,
a. judging whether the running state of the local power grid meets the condition before power failure; the current local power grid comprises a microgrid and a power grid;
b. establishing an equivalent mathematical model according to the current local power grid;
c. solving the equivalent mathematical model to obtain the power supply capacity of the current local power grid, comparing and judging the power supply capacity with the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
d. when the power transfer requirement exists, the input of new energy is allocated, and the power transfer is carried out according to the output power transfer path by matching with the power grid.
The method for supplying power by matching the new energy with the power grid comprises the following steps:
marking the number of the investable micro-grids, diagnosing and checking all devices of the micro-grids, and predicting the power supply capacity of the micro-grids in the next period, wherein the micro-grids comprise solar cells, wind driven generators and energy storage cells;
marking a power supply capability of a local power grid, the local power grid satisfying the following conditions, the conditions comprising:
1) satisfying for all nodes in the local power grid:
2) a voltage compensation device is arranged in a local power grid so that voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; when the local power grid can not meet the 2 conditions, the local power grid is diagnosed, the power supply path of the whole local power grid is traversed, a part of the line which can not meet the conditions is cut off, then whether the conditions are met or not is checked again, and if the conditions are still not met, the method is finished.
The method for supplying power by matching the new energy with the power grid comprises the following steps:
setting a switching path selection set S:
S={s1,s2,…si…，spg1, g2 … gi … gp }, p being the total number of handover paths for selection, siRepresents an alternative handover path; p is the total number of power supply paths for selection, and gi is the power supply path for selection;
establishing a simplified power flow model of the power system:
wherein, PiIs the active power of the node i and,
for the estimated voltage phase angle of node i in the local power grid,
for the estimated phase angle of the voltage at node j in the local network, BijAnd distributing the virtual parts of the admittance between the nodes i and j, wherein a, b and c are the input quantity of the solar battery, the wind driven generator and the energy storage battery, and the output power of the solar battery, the wind driven generator and the energy storage battery in the next period.
The method for supplying power by matching the new energy with the power grid comprises the following steps of:
selecting a power supply path gi, sequentially calculating the power supply capacity of the microgrid of the next period from g1 to gp of the selectable power supply path gi, sequentially accumulating and summing the power supply capacity of the microgrid of the next period, comparing the power supply capacity with the consumed power of the load, calculating whether the power supply capacity of the load can be matched, and if the power supply capacity of the microgrid can be matched, putting the microgrid into the power grid is not needed; if the power supply capacity of the micro-grid cannot be matched with the power to be consumed by the load, selecting a power grid capable of supplying power to be gradually put into the power grid; if power matching is still not possible;
checking paths capable of being transferred and supplied to form a plurality of sets of paths capable of being transferred and supplied for users to select, wherein the transferring and supplying path checking comprises the steps of solving simplified power flow after transferring and supplying are carried out according to the transferring and supplying path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in a local power grid after transferring and supplying are carried out according to the transferring and supplying path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the transferring and supplying path.
And solving the simplified power flow after the power transfer is implemented according to the power transfer path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in the local power grid after the power transfer is implemented according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
A calibration equipment of new forms of energy and electric wire netting cooperation power supply includes:
the judging module is used for judging whether the running state of the local power grid meets the condition before power failure;
the equivalence module is used for establishing an equivalence mathematical model according to the current local power grid;
the computing module is used for solving the equivalent mathematical model, obtaining the power supply capacity of the current local power grid, comparing and judging the power supply capacity and the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
and the output module allocates the input of new energy when the transfer demand exists, and the new energy is matched with the power grid to transfer power according to the output transfer path.
The calibration device for the new energy and power grid matched power supply is characterized in that the current local power grid comprises a micro grid and a power grid.
The calibration device for the new energy and power grid matched power supply comprises a micro grid, a power supply system and a power supply system, wherein the micro grid comprises a solar battery, a wind driven generator and an energy storage battery; the power grid comprises a plurality of alternative high voltage busbars; the solar battery, the wind driven generator, the energy storage battery and the selectable high-voltage buses are connected in parallel on a power supply bus, and the input end and the output end of the power supply bus are connected with controllable switches.
The calibration device for the new energy and power grid matched power supply further comprises a controller, wherein the controller controls the on-off of the power supply bus according to the output result of the output module so as to control the output of the micro grid and the power grid to form a switching scheme.
According to the method, the power recovery method considering conditions is set, and the scheme for rapidly performing new energy and power grid matched power recovery is obtained by selecting and checking the power supply path, so that the influence of insufficient power supply on a power supply load caused by power system faults can be reduced when local micro-grid control is performed in the future, and the power supply mode is more intelligent.
Drawings
Fig. 1 is a schematic diagram of a method for supplying power by matching new energy with a power grid.
Detailed Description
As shown in fig. 1, the present invention provides a method for supplying power by matching new energy with a power grid, which comprises the following steps,
a. judging whether the running state of the local power grid meets the condition before power failure; the current local power grid comprises a microgrid and a power grid;
b. establishing an equivalent mathematical model according to the current local power grid;
c. solving the equivalent mathematical model to obtain the power supply capacity of the current local power grid, comparing and judging the power supply capacity with the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
d. when the power transfer requirement exists, the input of new energy is allocated, and the power transfer is carried out according to the output power transfer path by matching with the power grid.
The method for supplying power by matching the new energy with the power grid comprises the following steps:
marking the number of the investable micro-grids, diagnosing and checking all devices of the micro-grids, and predicting the power supply capacity of the micro-grids in the next period, wherein the micro-grids comprise solar cells, wind driven generators and energy storage cells;
marking a power supply capability of a local power grid, the local power grid satisfying the following conditions, the conditions comprising:
1) satisfying for all nodes in the local power grid:
2) a voltage compensation device is arranged in a local power grid so that voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; when the local power grid can not meet the 2 conditions, the local power grid is diagnosed, the power supply path of the whole local power grid is traversed, a part of the line which can not meet the conditions is cut off, then whether the conditions are met or not is checked again, and if the conditions are still not met, the method is finished.
The method for supplying power by matching the new energy with the power grid comprises the following steps:
setting a switching path selection set S:
S={s1,s2,…si…，spg1, g2 … gi … gp }, p being the total number of handover paths for selection, siRepresents an alternative handover path; p is the total number of power supply paths for selection, and gi is the power supply path for selection;
establishing a simplified power flow model of the power system:
wherein, PiIs the active power of the node i and,
for the estimated voltage phase angle of node i in the local power grid,
for the estimated phase angle of the voltage at node j in the local network, BijAnd distributing the virtual parts of the admittance between the nodes i and j, wherein a, b and c are the input quantity of the solar battery, the wind driven generator and the energy storage battery, and the output power of the solar battery, the wind driven generator and the energy storage battery in the next period.
The method for supplying power by matching the new energy with the power grid comprises the following steps of:
selecting a power supply path gi, sequentially calculating the power supply capacity of the microgrid of the next period from g1 to gp of the selectable power supply path gi, sequentially accumulating and summing the power supply capacity of the microgrid of the next period, comparing the power supply capacity with the consumed power of the load, calculating whether the power supply capacity of the load can be matched, and if the power supply capacity of the microgrid can be matched, putting the microgrid into the power grid is not needed; if the power supply capacity of the micro-grid cannot be matched with the power to be consumed by the load, selecting a power grid capable of supplying power to be gradually put into the power grid; if power matching is still not possible;
checking paths capable of being transferred and supplied to form a plurality of sets of paths capable of being transferred and supplied for users to select, wherein the transferring and supplying path checking comprises the steps of solving simplified power flow after transferring and supplying are carried out according to the transferring and supplying path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in a local power grid after transferring and supplying are carried out according to the transferring and supplying path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the transferring and supplying path.
And solving the simplified power flow after the power transfer is implemented according to the power transfer path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in the local power grid after the power transfer is implemented according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
A calibration equipment of new forms of energy and electric wire netting cooperation power supply includes:
the judging module is used for judging whether the running state of the local power grid meets the condition before power failure;
the equivalence module is used for establishing an equivalence mathematical model according to the current local power grid;
the computing module is used for solving the equivalent mathematical model, obtaining the power supply capacity of the current local power grid, comparing and judging the power supply capacity and the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
and the output module allocates the input of new energy when the transfer demand exists, and the new energy is matched with the power grid to transfer power according to the output transfer path.
The calibration device for the new energy and power grid matched power supply is characterized in that the current local power grid comprises a micro grid and a power grid.
The calibration device for the new energy and power grid matched power supply comprises a micro grid, a power supply system and a power supply system, wherein the micro grid comprises a solar battery, a wind driven generator and an energy storage battery; the power grid comprises a plurality of alternative high voltage busbars; the solar battery, the wind driven generator, the energy storage battery and the selectable high-voltage buses are connected in parallel on a power supply bus, and the input end and the output end of the power supply bus are connected with controllable switches.
The calibration device for the new energy and power grid matched power supply further comprises a controller, wherein the controller controls the on-off of the power supply bus according to the output result of the output module so as to control the output of the micro grid and the power grid to form a switching scheme.
According to the method, the power recovery method considering conditions is set, and the scheme for rapidly performing new energy and power grid matched power recovery is obtained by selecting and checking the power supply path, so that the influence of insufficient power supply on a power supply load caused by power system faults can be reduced when local micro-grid control is performed in the future, and the power supply mode is more intelligent.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (6)
1. A method for supplying power by matching new energy with a power grid is characterized in that: comprises the following steps of (a) carrying out,
a. judging whether the running state of the local power grid meets the condition before power failure; the current local power grid comprises a microgrid and a power grid;
b. establishing an equivalent mathematical model according to the current local power grid;
c. solving the equivalent mathematical model to obtain the power supply capacity of the current local power grid, comparing and judging the power supply capacity with the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
d. when a transfer demand exists, the input of new energy is allocated, and the electric power transfer is carried out according to the output transfer path in cooperation with the power grid;
the step c comprises the following steps:
selecting a power supply path gi, sequentially calculating the power supply capacity of the microgrid of the next period from g1 to gp of the selectable power supply path gi, sequentially accumulating and summing the power supply capacity of the microgrid of the next period, comparing the power supply capacity with the consumed power of the load, calculating whether the power supply capacity of the load can be matched, and if the power supply capacity of the microgrid can be matched, putting the microgrid into the power grid is not needed; if the power supply capacity of the micro-grid cannot be matched with the power to be consumed by the load, selecting a power grid capable of supplying power to be gradually put into the power grid;
if the power matching still cannot be carried out, checking paths capable of carrying out power transfer to form a plurality of sets of paths capable of being transferred to be selected by users, wherein the power transfer path checking comprises the steps of solving simplified power flow after power transfer is carried out according to the power transfer path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in a local power grid after power transfer is carried out according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
2. The method for supplying power by matching new energy with a power grid according to claim 1, wherein the step a comprises:
marking the number of the investable micro-grids, diagnosing and checking all devices of the micro-grids, and predicting the power supply capacity of the micro-grids in the next period, wherein the micro-grids comprise solar cells, wind driven generators and energy storage cells;
marking a power supply capability of a local power grid, the local power grid satisfying the following conditions, the conditions comprising:
1) satisfying for all nodes in the local power grid:
2) a voltage compensation device is arranged in a local power grid so that voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; when the local power grid can not meet the 2 conditions, the local power grid is diagnosed, the power supply path of the whole local power grid is traversed, a part of the line which can not meet the conditions is cut off, then whether the conditions are met or not is checked again, and if the conditions are still not met, the method is finished.
3. The utility model provides a calibration equipment of new forms of energy and electric wire netting cooperation power supply which characterized in that: the method comprises the following steps:
the judging module is used for judging whether the running state of the local power grid meets the condition before power failure;
the equivalence module is used for establishing an equivalence mathematical model according to the current local power grid;
the computing module is used for solving the equivalent mathematical model, obtaining the power supply capacity of the current local power grid, comparing and judging the power supply capacity and the current load, determining the matching degree of the power supply capacity and the current load, and judging whether the power supply needs to be transferred or not;
the output module allocates the input of new energy when the transfer demand exists, and transfers the electric power according to the output transfer path in cooperation with the power grid;
the calculation of the calculation module specifically includes:
selecting a power supply path gi, sequentially calculating the power supply capacity of the microgrid of the next period from g1 to gp of the selectable power supply path gi, sequentially accumulating and summing the power supply capacity of the microgrid of the next period, comparing the power supply capacity with the consumed power of the load, calculating whether the power supply capacity of the load can be matched, and if the power supply capacity of the microgrid can be matched, putting the microgrid into the power grid is not needed; if the power supply capacity of the micro-grid cannot be matched with the power to be consumed by the load, selecting a power grid capable of supplying power to be gradually put into the power grid;
if the power matching still cannot be carried out, checking paths capable of carrying out power transfer to form a plurality of sets of paths capable of being transferred to be selected by users, wherein the power transfer path checking comprises the steps of solving simplified power flow after power transfer is carried out according to the power transfer path by adopting a power system simulation program, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in a local power grid after power transfer is carried out according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
4. The verification device for the new energy source and the power grid to supply power in a matched mode according to claim 3, wherein the verification device comprises: the current local power grid comprises a microgrid and a power grid.
5. The verification device for the new energy source and the power grid to supply power in a matched mode according to claim 4, wherein the verification device comprises: the micro-grid comprises a solar battery, a wind driven generator and an energy storage battery; the power grid comprises a plurality of alternative high voltage busbars; the solar battery, the wind driven generator, the energy storage battery and the selectable high-voltage buses are connected in parallel on a power supply bus, and the input end and the output end of the power supply bus are connected with controllable switches.
6. The verification device for the new energy source and the power grid to supply power in a matched mode according to claim 5, wherein the verification device comprises: the controller controls the on-off of the power supply bus according to the output result of the output module so as to control the output of the microgrid and the power grid to form a switching scheme.
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| CN102738834A (en) * | 2012-06-21 | 2012-10-17 | 浙江大学 | Method for dynamically dividing and operating multiple islands of city micro power grid with photovoltaic power supplies |
| CN102983629A (en) * | 2012-11-07 | 2013-03-20 | 中国电力科学研究院 | Auxiliary decision-making method for on-line power system restoration |
| CN103855707A (en) * | 2014-02-20 | 2014-06-11 | 深圳供电局有限公司 | Power supply reliability assessment method for power distribution network with distributed power supply |
| CN105470928A (en) * | 2015-09-21 | 2016-04-06 | 国电南瑞科技股份有限公司 | Zoned and layered load transferring method based on urban power transmission network fault recovery |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104810823B (en) * | 2014-01-24 | 2017-07-14 | 国际商业机器公司 | Produce method, equipment and the system of transformer station's load transfer control parameter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738834A (en) * | 2012-06-21 | 2012-10-17 | 浙江大学 | Method for dynamically dividing and operating multiple islands of city micro power grid with photovoltaic power supplies |
| CN102983629A (en) * | 2012-11-07 | 2013-03-20 | 中国电力科学研究院 | Auxiliary decision-making method for on-line power system restoration |
| CN103855707A (en) * | 2014-02-20 | 2014-06-11 | 深圳供电局有限公司 | Power supply reliability assessment method for power distribution network with distributed power supply |
| CN105470928A (en) * | 2015-09-21 | 2016-04-06 | 国电南瑞科技股份有限公司 | Zoned and layered load transferring method based on urban power transmission network fault recovery |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
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