CN109494814B - Control method of smart power grid with energy storage device - Google Patents

Control method of smart power grid with energy storage device Download PDF

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CN109494814B
CN109494814B CN201811647205.3A CN201811647205A CN109494814B CN 109494814 B CN109494814 B CN 109494814B CN 201811647205 A CN201811647205 A CN 201811647205A CN 109494814 B CN109494814 B CN 109494814B
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何川
郑力文
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Sichuan University
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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
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

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Abstract

The invention discloses a control method of a smart grid with an energy storage device, which comprises the following steps: (1) receiving output power of a distributed power supply; calculating all power which can be output by a power grid; (2) calculating load required power, and adjusting output power ratio of the distributed power supply; (3) sampling the energy storage device according to a period, and calculating the output efficiency of the energy storage device in the sampling period; (4) and controlling the power value output by the energy output storage device according to the output efficiency and the output power ratio of the distributed power supply. The invention can adjust the output of the energy storage device according to the proportion of the power supply of the distributed power supply, so that the output power of the energy storage device is reduced, the orderly control of the energy is improved, and the intellectualization of the power supply of a power grid is realized.

Description

Control method of smart power grid with energy storage device
Technical Field
The invention relates to the technical field of smart grids, in particular to a control method of a smart grid with an energy storage device.
Background
In the prior art, the intelligent allocation of the power grid has gradually gained attention of practitioners along with the optimization of the control chip, and along with the gradual popularization of new energy power generation, the power generation by using new energy such as photovoltaic energy, wind power and the like is widely introduced, meanwhile, the battery is used as a backup energy storage, on one hand, the battery can effectively perform backup energy storage, but, when the energy storage battery is used as a backup energy storage, the use times of the energy storage battery are more due to the stability of the photovoltaic power generation part, the wind power generation part and the like, the service life of the battery plays a very important role in the cost of the whole power grid, how to optimally control the use times of the battery is considered in the present distributed power generation and the future smart grid, then, in the related art, emergency starting or energy supplement is performed only by using a battery as backup energy, such as in the form of a UPS, and consideration is not given to cost of an energy storage device such as a battery in accordance with an inherent specific state of distributed power generation or transfer efficiency of electric power or the like.
Disclosure of Invention
The invention provides a control method of a smart grid with an energy storage device, which comprises the following steps:
(1) receiving output power of a distributed power supply; calculating all power which can be output by a power grid;
(2) calculating load required power, and adjusting output power ratio of the distributed power supply;
(3) sampling the energy storage device according to a period, and calculating the output efficiency of the energy storage device in the sampling period;
(4) and controlling the power value output by the energy output storage device according to the output efficiency and the output power ratio of the distributed power supply.
In the control method, the calculating of all the power that can be output by the power grid in step (1) specifically includes:
Figure 821819DEST_PATH_IMAGE001
wherein, s is the sampling time,
Figure 738960DEST_PATH_IMAGE002
the s +1 th sample is the SOC of the energy storage device,
Figure 456380DEST_PATH_IMAGE003
the s-th sample is the SOC of the energy storage device, td is the rate of change of power output of the energy storage device,
Figure 851589DEST_PATH_IMAGE004
the total outputtable power of the energy storage device;
Figure 665962DEST_PATH_IMAGE005
wherein the content of the first and second substances,
Figure 675375DEST_PATH_IMAGE006
to output the power for the power grid,
Figure 942408DEST_PATH_IMAGE007
in order to achieve a power transfer efficiency,
Figure 141308DEST_PATH_IMAGE008
the total outputtable power of the energy storage device;
Figure 747870DEST_PATH_IMAGE009
for work output of distributed power suppliesThe value is obtained.
The control method, the
Figure 741234DEST_PATH_IMAGE010
The specific calculation comprises the following modes:
Figure 495563DEST_PATH_IMAGE011
wherein I is the current output to the load, R is the resistance on the transmission line,
Figure 419526DEST_PATH_IMAGE012
for the purpose of the power received by the load,
Figure 942911DEST_PATH_IMAGE013
outputting power for the power grid;
Figure 372755DEST_PATH_IMAGE014
the power for reactive compensation and harmonic compensation.
In the control method, the adjusting of the output power ratio of the distributed power supply in the step (2) specifically includes: determining power ratios of photovoltaic power generation, wind power generation, diesel power generation and thermal power generation in the distributed power supply according to the total power output by the distributed power supply, wherein the photovoltaic power generation and the wind power generation are new energy power generation, and the diesel power generation and the thermal power generation are traditional power generation; calculating the ratio of new energy to power generation
Figure 614381DEST_PATH_IMAGE016
Ratio of traditional power generation
Figure 827188DEST_PATH_IMAGE017
。
In the control method, the step (4) of controlling the power value output by the energy output storage device specifically includes:
meeting the output power of an energy storage device
Figure 470658DEST_PATH_IMAGE018
Minimum:
Figure 805825DEST_PATH_IMAGE019
wherein the content of the first and second substances,
Figure 721697DEST_PATH_IMAGE020
、
Figure 800512DEST_PATH_IMAGE021
the minimum value and the maximum value of the total outputtable power of the energy storage device respectively;
Figure 298489DEST_PATH_IMAGE022
、
Figure 70136DEST_PATH_IMAGE023
a minimum value and a maximum value of the SOC of the energy storage device, respectively;
Figure 958458DEST_PATH_IMAGE024
outputting power for the power grid;
Figure 840963DEST_PATH_IMAGE025
outputting a power reference value for the distributed power supply;
Figure 193447DEST_PATH_IMAGE026
outputting a regulating parameter for the distributed power supply;
Figure 135995DEST_PATH_IMAGE027
an adjustment parameter output by the energy storage device, which is adjusted according to a current temperature value of the energy storage device;
Figure 760880DEST_PATH_IMAGE028
the optimal output control value of u(s);
Figure 181497DEST_PATH_IMAGE029
wherein，
Figure 654067DEST_PATH_IMAGE030
The proportion of new energy put into the distributed power supply,
Figure 705200DEST_PATH_IMAGE031
for the output power of the new energy source put into the distributed power supply,
Figure 630430DEST_PATH_IMAGE032
the proportion of the conventional power source put into the distributed power source,
Figure 854738DEST_PATH_IMAGE033
the output power of a traditional power supply put into the distributed power supply;
Figure 103186DEST_PATH_IMAGE034
wherein the content of the first and second substances,
Figure 387537DEST_PATH_IMAGE035
the beneficial technical effects obtained by the invention are as follows: (1) the invention can reduce the use times of the energy storage device and prolong the service life of the energy storage device; (2) according to the power supply power ratio of the distributed power supply, the output power value of the energy storage device is adjusted, and intelligent control of a power grid is achieved; (3) in the power supply process, the power quality and the power transmission efficiency of power supply are fully considered, the output of the energy storage device is controlled according to the power quality and the transmission efficiency, the output control is performed by fully considering the external power supply environment of the energy storage device, the power value output by the energy storage device is reduced, the charging and discharging times of the energy storage device are reduced, the allocation of the whole power supply is improved, the intelligent allocation of the power supply is realized, the service life of a battery is prolonged, and the use cost of the whole power grid is reduced by optimizing a control mode.
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The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. In the drawings, like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic diagram of the control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
Fig. 1 is a schematic diagram of the control method of the present invention. The invention provides a control method of a smart grid with an energy storage device, which comprises the following steps:
(1) receiving output power of a distributed power supply; calculating all power which can be output by a power grid;
(2) calculating load demand power, determining the load demand power by receiving an externally set or input power demand, predicting power according to historical data, adjusting output power ratio of the distributed power supply according to the calculated load demand power, determining whether the power supply of the distributed power supply can meet the load demand, considering that thermal power generation or diesel power generation is required to be input according to cost when new energy in the distributed power supply cannot completely meet the load demand, integrally evaluating the power supply cost and equipment loss cost of a system according to the input electric energy output by a traditional power generation matched battery, and calculating the ratio of the whole output power of the distributed power supply; if the energy storage device is required to supply power, entering the step (3);
(3) sampling the energy storage device according to a period, and calculating the output efficiency of the energy storage device in the sampling period;
(4) and controlling the power value output by the energy output storage device according to the output efficiency and the output power ratio of the distributed power supply.
In the control method, the calculating of all the power that can be output by the power grid in step (1) specifically includes:
Figure 800063DEST_PATH_IMAGE036
wherein, s is the sampling time,
Figure 765745DEST_PATH_IMAGE037
the s +1 th sample is the SOC of the energy storage device,
Figure 947328DEST_PATH_IMAGE039
the s-th sample is the SOC of the energy storage device, td is the rate of change of power output of the energy storage device,
Figure 137001DEST_PATH_IMAGE041
the total outputtable power of the energy storage device;
Figure 217915DEST_PATH_IMAGE042
wherein the content of the first and second substances,
Figure 784026DEST_PATH_IMAGE043
to output the power for the power grid,
Figure 85694DEST_PATH_IMAGE044
in order to achieve a power transfer efficiency,
Figure 383951DEST_PATH_IMAGE046
is totally outputtable from the energy storage deviceThe power of (d);
Figure 771070DEST_PATH_IMAGE048
and outputting the power value for the distributed power supply.
The control method, the
Figure 140872DEST_PATH_IMAGE010
The specific calculation comprises the following modes:
Figure 218418DEST_PATH_IMAGE049
wherein I is the current output to the load, R is the resistance on the transmission line,
Figure 15473DEST_PATH_IMAGE051
for the purpose of the power received by the load,
Figure 624309DEST_PATH_IMAGE053
outputting power for the power grid;
Figure 797801DEST_PATH_IMAGE054
the power for reactive compensation and harmonic compensation.
In the control method, the adjusting of the output power ratio of the distributed power supply in the step (2) specifically includes: determining power ratios of photovoltaic power generation, wind power generation, diesel power generation and thermal power generation in the distributed power supply according to the total power output by the distributed power supply, wherein the photovoltaic power generation and the wind power generation are new energy power generation, and the diesel power generation and the thermal power generation are traditional power generation; calculating the ratio of new energy to power generation
Figure 746165DEST_PATH_IMAGE016
Ratio of traditional power generation
Figure 714121DEST_PATH_IMAGE055
。
In the control method, the step (4) of controlling the power value output by the energy output storage device specifically includes:
meeting the output power of an energy storage device
Figure 810253DEST_PATH_IMAGE056
Minimum:
Figure 708808DEST_PATH_IMAGE057
wherein the content of the first and second substances,
Figure 573996DEST_PATH_IMAGE058
、
Figure 712853DEST_PATH_IMAGE059
the minimum value and the maximum value of the total outputtable power of the energy storage device respectively;
Figure 296281DEST_PATH_IMAGE060
、
Figure 483680DEST_PATH_IMAGE061
a minimum value and a maximum value of the SOC of the energy storage device, respectively;
Figure 468954DEST_PATH_IMAGE062
outputting power for the power grid;
Figure 778712DEST_PATH_IMAGE063
outputting a power reference value for the distributed power supply;
Figure 849437DEST_PATH_IMAGE065
outputting a regulating parameter for the distributed power supply;
Figure 89794DEST_PATH_IMAGE066
an adjustment parameter output by the energy storage device, which is adjusted according to a current temperature value of the energy storage device;
Figure 929574DEST_PATH_IMAGE067
the optimal output control value of u(s);
Figure 410234DEST_PATH_IMAGE068
wherein the content of the first and second substances,
Figure 702675DEST_PATH_IMAGE069
the proportion of new energy put into the distributed power supply,
Figure 497456DEST_PATH_IMAGE070
for the output power of the new energy source put into the distributed power supply,
Figure 191742DEST_PATH_IMAGE071
the proportion of the conventional power source put into the distributed power source,
Figure 843303DEST_PATH_IMAGE072
the output power of a traditional power supply put into the distributed power supply;
Figure 75570DEST_PATH_IMAGE074
wherein the content of the first and second substances,
Figure 470780DEST_PATH_IMAGE075
the energy storage device is preferably a lithium battery or a super capacitor, the main invention point of the invention is that the output power of the energy storage device is allocated by considering the power supply proportion of the power generation of the new energy in the distributed power generation and the traditional power generation, and meanwhile, the output power of the energy storage device can be adjusted according to the transmission efficiency from the power grid to the load, such as the efficiency of a power grid transformer, the efficiency of line transmission, and the influence of harmonic and reactive compensation on the power grid, so that the use frequency of the energy storage device is reduced as much as possible, and the invention is suitable for the intelligent control of the intelligent power grid.
The beneficial technical effects obtained by the invention are as follows: (1) the invention can reduce the use times of the energy storage device and prolong the service life of the energy storage device; (2) according to the power supply power ratio of the distributed power supply, the output power value of the energy storage device is adjusted, and intelligent control of a power grid is achieved; (3) in the power supply process, the power quality and the power transmission efficiency of power supply are fully considered, the output of the energy storage device is controlled according to the power quality and the transmission efficiency, the output control is performed by fully considering the external power supply environment of the energy storage device, the power value output by the energy storage device is reduced, the charging and discharging times of the energy storage device are reduced, the allocation of the whole power supply is improved, the intelligent allocation of the power supply is realized, the service life of a battery is prolonged, and the use cost of the whole power grid is reduced by optimizing a control mode.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.

Claims (1)

1. A method of controlling a smart grid having an energy storage device, comprising the steps of:
(1) receiving output power of a distributed power supply; calculating all power which can be output by a power grid;
(2) calculating load required power, and adjusting output power ratio of the distributed power supply;
(3) sampling the energy storage device according to a period, and calculating the output efficiency of the energy storage device in the sampling period;
(4) controlling the power value output by the energy storage device according to the output efficiency and the output power ratio of the distributed power supply; the step (1) of calculating all the power that can be output by the power grid specifically includes:
Eb(s+1)＝Eb(s)-tdu(s)
where s is the sampling time, Eb(s +1) is the SOC of the energy storage device for the s +1 th sample, Eb(s) the s-th sample is the SOC, t, of the energy storage devicedIs the rate of change of power output of the energy storage device, u(s) is the total outputtable power of the energy storage device;
y1(s)＝(1-μ){u(s)+Pw(s)}
wherein, y1(s) is the grid output power, μ is the power transfer efficiency, and u(s) is the total outputtable power of the energy storage device; pw(s) is the distributed power supply output power value; the specific calculation of μ includes the following modes:
μ＝μ1+μ2
Figure FDA0002383238130000011
Figure FDA0002383238130000012
where I is the current output to the load, R is the resistance on the transmission line, y(s) is the power received by the load, y1(s) is the grid output power; pxThe method specifically comprises the steps of (2) determining power ratios of photovoltaic power generation, wind power generation, diesel power generation and thermal power generation in the distributed power supply according to the total power output by the distributed power supply, wherein the photovoltaic power generation and the wind power generation are new energy power generation, the diesel power generation and the thermal power generation are traditional power generation, calculating a ratio α of the new energy power generation and a ratio β of the traditional power generation, and controlling the power value output by an energy storage device in the step (4) specifically comprises the following steps:
satisfy the output power J of the energy storage device1(u (s)) minimum:
minJ1(u(s))
umin≤u(s)≤umax
Emin≤Eb(s)≤Emax
J1(u(s))＝γ*[y1(s)-yref(s)]2+*[u(s)]2
Figure FDA0002383238130000021
wherein u ismin、umaxThe minimum value and the maximum value of the total outputtable power of the energy storage device respectively; emin、EmaxA minimum value and a maximum value of the SOC of the energy storage device, respectively; y is1(s) is the grid output power; y isref(s) is a reference value of the output power of the distributed power supply; gamma is a distributed power supply output adjusting parameter; an adjustment parameter output by the energy storage device, which is adjusted according to a current temperature value of the energy storage device; u. ofuc(s) is the optimal output control value of u(s);
Figure FDA0002383238130000022
wherein α is the ratio of new energy put into the distributed power supply, PwNThe output power of the new energy source put into the distributed power supply is β the proportion of the traditional power supply put into the distributed power supply, PwCThe output power of a traditional power supply put into the distributed power supply;
Figure FDA0002383238130000023
wherein the content of the first and second substances,
Figure FDA0002383238130000024
Figure FDA0002383238130000025
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