CN109193716B - Power distribution method and device for modular superconducting magnetic energy storage system - Google Patents

Power distribution method and device for modular superconducting magnetic energy storage system Download PDF

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Publication number
CN109193716B
CN109193716B CN201811259736.5A CN201811259736A CN109193716B CN 109193716 B CN109193716 B CN 109193716B CN 201811259736 A CN201811259736 A CN 201811259736A CN 109193716 B CN109193716 B CN 109193716B
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modular
energy storage
storage system
modular superconducting
sequencing
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CN109193716A (en
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宋萌
胡南南
史正军
罗运松
程文锋
李力
林友新
韦玮
李媛媛
高铭含
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00Systems for storing electric energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

The invention discloses a method and a device for power distribution of a modular superconducting magnet energy storage system, which are characterized in that master-slave sequencing is carried out according to the priority of four indexes, namely a work done accumulated value, maximum charge-discharge power, a charge state and a fixed serial number to obtain a sequence of the modular superconducting magnets, the power distribution amount of each modular superconducting magnet is determined according to the sequence condition of each working period and the power shortage of the modular superconducting magnet energy storage system, the initial power reference value of each modular superconducting magnet is obtained through calculation and is input into a charge state controller for secondary judgment as the reference amount of active/reactive power outer loop control of each modular superconducting magnet, the safety of the modular superconducting magnets is ensured, and the final power reference value of each modular superconducting magnet is obtained. The invention coordinately controls each step subarea, and realizes the power distribution of the modular superconducting magnetic energy storage system on the premise of keeping the expansibility.

Description

Power distribution method and device for modular superconducting magnetic energy storage system
Technical Field
The invention relates to the technical field of superconducting systems, in particular to a power distribution method and device for a modular superconducting magnetic energy storage system.
Background
In order to realize the efficient utilization of resources, ensure the safe and economic operation of a power grid and promote the large-scale application of intermittent energy sources such as wind power and the like, the research on an electric energy storage technology for improving the intermittent energy consumption capability of a power system has very important application value. Energy storage technologies such as storage batteries and batteries with relatively mature technologies far fail to meet the requirements of dynamic power compensation in terms of charging and discharging speed and charging and discharging service life, and the technologies are indispensable for accepting intermittent new energy, improving reliability and improving electric energy quality and having rapid dynamic power compensation capacity in large power grids and micro-grids. Compared with other Energy Storage technologies (such as battery type large-capacity Energy Storage), the Superconducting Magnetic Energy Storage (SMES) has higher Energy Storage density and Energy Storage efficiency, high response speed and capability of independently controlling active and reactive power compensation.
Due to the problems of technology, cost and the like, the development of a single SMES with large capacity is difficult, and the modular SMES realizes the modular layout of superconducting magnetic energy storage through an advanced control technology, so that the limitation of participating in the stable control of a power system can be solved. In actual operation, the energy storage units relate to different magnet operating conditions, and in order to exert the function of the modular SMES to the maximum extent and enable each module unit to operate in a safe range, the topological design and the power distribution-based coordination control strategy are important research contents.
In the aspect of the control strategy of the SMES, a lot of research results and experience of experimental operation are already available for the control of a single SMES, and academic documents about coordination between the SMES and other devices (UFLS, UFGC, SSSC, TCPS) in the power system can also be found. However, research results on the coordination control of multiple SMES are still few, and therefore, a method and a device for power distribution of a modular superconducting magnetic energy storage system are needed to realize the coordination control of multiple SMES.
Disclosure of Invention
The invention provides a power distribution method and a power distribution device for a modular superconducting magnetic energy storage system, which realize the coordinated control of a plurality of SMES.
The invention provides a power distribution method of a modular superconducting magnetic energy storage system, which comprises the following steps:
acquiring the power shortage of the modular superconducting magnetic energy storage system;
acquiring a work doing accumulated value, maximum charge-discharge power, a charge state and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
performing master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work doing accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence;
according to a modularized superconducting magnet sequence, performing power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
and inputting the initial power reference value of each modular superconducting magnet into the corresponding state of charge controller, and obtaining a final power reference value through feedback regulation of the state of charge controller.
Optionally, the performing master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the state of charge, and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence specifically includes:
sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for the first time from small to large according to the work done accumulated value;
performing secondary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charge-discharge power from large to small;
carrying out three times of sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the charge states from large to small;
if the work accumulated value, the maximum charge-discharge power or the charge state of two or more modular superconducting magnets are the same in the primary sorting, the secondary sorting and the tertiary sorting, sorting is carried out according to a fixed serial number;
and obtaining a modular superconducting magnet sequence according to the work doing accumulated value, the maximum charge-discharge power and the preset sequencing of the state of charge and by combining the results of the primary sequencing, the secondary sequencing and the tertiary sequencing.
Optionally, the feedback adjustment of the state of charge controller specifically includes:
s51, judging whether the real-time charge state is in the operable range, if not, setting the power reference value of the modularized superconducting magnet to zero, and if so, executing a step S52;
and S52, judging whether the real-time charge state is in a braking region, if so, increasing a feedback gain coefficient in the charge state controller until the real-time charge state is not in the braking region, and if not, outputting a final power reference value of the modular superconducting magnet according to the real-time charge state.
The invention provides a power distribution device of a modular superconducting magnetic energy storage system, which comprises:
the first acquisition unit is used for acquiring the power shortage of the modular superconducting magnetic energy storage system;
the second acquisition unit is used for acquiring the work doing accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
the sequencing unit is used for carrying out master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence;
the initial power distribution unit is used for carrying out power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to the modularized superconducting magnet sequence and the power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
and the feedback adjusting unit is used for inputting the initial power reference value of each modularized superconducting magnet into the corresponding state-of-charge controller, and obtaining a final power reference value through feedback adjustment of the state-of-charge controller.
Optionally, the sorting unit specifically includes:
the first sequencing subunit is used for sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for the first time from small to large according to the work done accumulated value;
the second sequencing subunit is used for performing secondary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charging and discharging power from large to small;
the third sequencing subunit is used for sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for three times according to the charge states from large to small;
the fourth sequencing subunit is used for sequencing according to a fixed serial number if the work done accumulated value, the maximum charge-discharge power or the charge state of two or more modularized superconducting magnets are the same in the primary sequencing, the secondary sequencing and the tertiary sequencing;
and the fifth sequencing subunit is used for obtaining the modular superconducting magnet sequence according to the work doing accumulated value, the maximum charge-discharge power and the preset sequencing of the state of charge and combining the results of the primary sequencing, the secondary sequencing and the tertiary sequencing.
Optionally, the feedback adjusting unit includes:
the first judging unit is used for judging whether the real-time charge state is in an operable range, if not, the power reference value of the modularized superconducting magnet is set to be zero, and if so, the modularized superconducting magnet jumps to the second judging unit;
and the second judging unit is used for judging whether the real-time charge state is in the braking region, if so, increasing a feedback gain coefficient in the charge state controller until the real-time charge state is not in the braking region, and if not, outputting a final power reference value of the modularized superconducting magnet according to the real-time charge state.
According to the technical scheme, the invention has the following advantages:
according to the method, master-slave sequencing is carried out according to priority levels of four indexes, namely a work done accumulated value, maximum charge-discharge power, a state of charge and a fixed serial number to obtain a sequence of the modular superconducting magnets, the power distribution amount of each modular superconducting magnet is determined according to the sequence condition of each working period and the power shortage of the modular superconducting magnetic energy storage system, the initial power reference value of each modular superconducting magnet is obtained through calculation and is used as the reference amount of active/reactive power outer loop control of each modular superconducting magnet to be input into a state of charge controller for secondary judgment, the safety of each modular superconducting magnet is guaranteed, and therefore the final power reference value of each modular superconducting magnet is obtained. The invention coordinately controls each step subarea, and realizes the power distribution of the modular superconducting magnetic energy storage system on the premise of keeping the expansibility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an embodiment of a power distribution method for a modular superconducting magnetic energy storage system according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of a power distribution method for a modular superconducting magnetic energy storage system according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a modular superconducting magnetic energy storage system power distribution apparatus provided by the present invention;
fig. 4 is a schematic structural diagram of another embodiment of a modular superconducting magnetic energy storage system power distribution apparatus provided by the present invention;
fig. 5 is a master-slave sequencing and initial power reference distribution diagram of a modular superconducting magnet according to an embodiment of the present invention;
fig. 6 is a structural diagram of adaptive SOC feedback control provided in an embodiment of the present invention;
fig. 7 is a SOC hierarchy chart provided in an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a power distribution method and device for a modular superconducting magnetic energy storage system, which realize the coordinated control of a plurality of SMES.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of a power distribution method for a modular superconducting magnetic energy storage system according to the present invention includes:
101. acquiring the power shortage of the modular superconducting magnetic energy storage system;
it should be noted that the monitoring system of the modular superconducting magnetic energy storage system obtains the power shortage of the modular superconducting magnetic energy storage system, that is, the power reference value P of the modular superconducting magnetic energy storage systemrefDefinition of PrefLess than zero means discharging and greater than zero means charging.
102. Acquiring a work doing accumulated value, maximum charge-discharge power, a charge state and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
before sequencing, the work done accumulated value, the maximum charge and discharge power, the state of charge and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system are obtained.
103. Performing master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work doing accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence;
it should be noted that, the priority among the work done accumulated value, the maximum charge-discharge power, the state of charge, and the fixed serial number is determined according to the actual demand, and then the master-slave sequencing is performed on each modular superconducting magnet according to the priority. Compared with the traditional energy storage technology, the superconducting magnetic energy storage has no limitation on the charging and discharging times, but because the superconducting magnet needs a low-temperature operating environment and repeated charging and discharging are accompanied with the loss of power electronic devices, as few modules as possible are required to be put into use in one working cycle. In order to maximize the utilization of the charging and discharging capacity of the superconducting magnetic energy storage system, maintain the modules within a safe operation range and avoid continuous operation of one or some of the modular superconducting magnets, the modular superconducting magnets need to be sorted primarily and secondarily in each working period.
104. According to a modularized superconducting magnet sequence, performing power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
it should be noted that each modular superconducting magnet performs power distribution according to the determined master-slave sequence, and calculates an initial power reference value P of each modular superconducting magnetref1~nAnd returning each initial power reference value to the state of charge controller of each modular superconducting magnet through an index sequence.
Fig. 5 is a master-slave sequencing and power distribution diagram, where numbers 1, 2, 3, and 4 … n are fixed numbers of the modular superconducting magnet, and a, b, c, and d … n are master-slave sequencing of the modular superconducting magnet for each working cycle.
105. And inputting the initial power reference value of each modular superconducting magnet into the corresponding state of charge controller, and obtaining a final power reference value through feedback regulation of the state of charge controller.
According to the embodiment of the invention, master-slave sequencing is carried out according to the priority levels of four indexes, namely a work done accumulated value, maximum charge-discharge power, a charge state and a fixed serial number to obtain a sequence of the modularized superconducting magnets, the power allocation of each modularized superconducting magnet is determined according to the sequence condition of each working period and the power shortage of the modularized superconducting magnetic energy storage system, the initial power reference value of each modularized superconducting magnet is obtained through calculation and is input into a charge state controller for secondary judgment to ensure the safety of the modularized superconducting magnets as the reference value of active/reactive power outer loop control of each modularized superconducting magnet, and thus the final power reference value of each modularized superconducting magnet is obtained. The invention coordinately controls each step subarea, and realizes the power distribution of the modular superconducting magnetic energy storage system on the premise of keeping the expansibility.
The above is a description of an embodiment of a power distribution method for a modular superconducting magnetic energy storage system provided by the present invention, and another embodiment of the power distribution method for a modular superconducting magnetic energy storage system provided by the present invention is described below.
Referring to fig. 2, another embodiment of a power distribution method for a modular superconducting magnetic energy storage system according to the present invention includes:
201. acquiring the power shortage of the modular superconducting magnetic energy storage system;
it should be noted that the monitoring system of the modular superconducting magnetic energy storage system obtains the power shortage of the modular superconducting magnetic energy storage system, that is, the power reference value P of the modular superconducting magnetic energy storage systemrefDefinition of PrefLess than zero means discharging and greater than zero means charging.
202. Acquiring a work doing accumulated value, maximum charge-discharge power, a charge state and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
before sequencing, the work done accumulated value, the maximum charge and discharge power, the state of charge and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system are obtained.
203. Sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for the first time from small to large according to the work done accumulated value;
it should be noted that the work-done accumulated value of the modular superconducting magnet is used as a reference factor for sorting, for example, when the number of discharge times or the accumulated work done of a modular superconducting magnet in a period of time reaches a certain amount, the next working cycle will sort the modular superconducting magnet backward, so that the situation that a certain modular superconducting magnet is used as a main energy storage module for a long time can be avoided.
204. Performing secondary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charge-discharge power from large to small;
it should be noted that the maximum charging/discharging power of each modular superconducting magnet represents the power exchange capability of each modular superconducting magnet, and is one of the most important reference factors in the sequence, and the calculation formula is as follows:
Pin=Udc·Isc·D(0≤D≤1)
Pout=Udc·Isc·(1-D)(0≤D≤1)
Pmax=Udc·Isc
wherein, Pin、PoutRespectively, charging and discharging power of each modular superconducting magnet, UdcIs a direct-current side voltage, IscIs the current of the modular superconducting magnet and D is the duty cycle of the chopper.
Whether the modular superconducting magnetic energy storage system needs to be charged or discharged, the modular superconducting magnetic energy storage system is arranged according to the descending order of the maximum charging/discharging power from large to small.
205. Carrying out three times of sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the charge states from large to small;
it should be noted that, when the modular superconducting magnets need to output power, the modular superconducting magnets are arranged in a descending order according to the size of the SOC, that is, the modular superconducting magnet with the largest SOC value (state of charge) is used as the first discharging module; otherwise, the sequence is in ascending order. The SOC value is calculated as follows:
wherein L is the inductance value of the modular superconducting magnet, i is the actual current of the superconducting coil, EbaseThe maximum energy that can be stored for the modular superconducting magnet.
When P is presentrefIf the number is less than 0, namely the modular superconducting magnets are arranged according to the size of the SOC in a descending order when the modular superconducting magnetic energy storage system needs to discharge; when P is presentrefAnd if the SOC is more than 0, namely when the modular superconducting magnetic energy storage system needs to be charged, the modular superconducting magnets are arranged according to the SOC in an ascending order.
206. If the work accumulated value, the maximum charge-discharge power or the charge state of two or more modular superconducting magnets are the same in the primary sorting, the secondary sorting and the tertiary sorting, sorting is carried out according to a fixed serial number;
it should be noted that, in a special case, the three indexes of the work accumulation value, the maximum charge-discharge power, and the state of charge of several modular superconducting magnets may be the same, and the sequencing has randomness, which may cause the sequencing of each modular superconducting magnet to jump, and a fixed number needs to be set to avoid such a situation.
207. Obtaining a modular superconducting magnet sequence according to the work doing accumulated value, the maximum charge-discharge power and the preset sequencing of the state of charge and by combining the results of the primary sequencing, the secondary sequencing and the tertiary sequencing;
it should be noted that, the priority among the work done accumulated value, the maximum charge-discharge power, the state of charge, and the fixed serial number is determined according to the actual demand, and then the master-slave sequencing is performed on each modular superconducting magnet according to the priority. Compared with the traditional energy storage technology, the superconducting magnetic energy storage has no limitation on the charging and discharging times, but because the superconducting magnet needs a low-temperature operating environment and repeated charging and discharging are accompanied with the loss of power electronic devices, as few modules as possible are required to be put into use in one working cycle. In order to maximize the utilization of the charging and discharging capacity of the superconducting magnetic energy storage system, maintain the modules within a safe operation range and avoid continuous operation of one or some of the modular superconducting magnets, the modular superconducting magnets need to be sorted primarily and secondarily in each working period.
208. According to a modularized superconducting magnet sequence, performing power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
it should be noted that each modular superconducting magnet performs power distribution according to the determined master-slave sequence, and calculates an initial power reference value P of each modular superconducting magnetref1~nAnd returning each initial power reference value to the state of charge controller of each modular superconducting magnet through an index sequence.
Fig. 5 is a master-slave sequencing and power distribution diagram, where numbers 1, 2, 3, and 4 … n are fixed numbers of the modular superconducting magnet, and a, b, c, and d … n are master-slave sequencing of the modular superconducting magnet for each working cycle.
209. Inputting the initial power reference value of each modular superconducting magnet into a corresponding state of charge controller, judging whether the real-time state of charge is within an operable range, if not, setting the power reference value of the modular superconducting magnet to zero, and if so, executing step 210;
210. judging whether the real-time charge state is in a braking region, if so, increasing a feedback gain coefficient in a charge state controller until the real-time charge state is not in the braking region, and if not, increasing a feedback gain coefficient in the charge state controller;
similar to SOC management of the storage battery, for normal charging and discharging operations, the acceptable SOC range of the modular superconducting magnet is 0.1-0.9, the initial SOC can be set at 0.65, and a detailed layering method is shown in fig. 7. The operable range of the SOC is divided into a free area and a braking area, and the boundary of the free area is the SOCdownAnd SOCup. In the free region, charging and discharging of the SMES is substantially not restricted. Braking areaIncluding SOCup~SOCmaxAnd SOCdown~SOCminTwo regions where the SOC of the modular superconducting magnet falls, the output will be limited. This limitation is reflected in two aspects:
1) and (4) power limitation. When SOC of SMES reaches the boundary SOCmin and PrefnWhen < 0, the power reference value is set to zero, and similarly, when SOC of SMES reaches the boundary SOCmax and PrefnAnd when the power reference value is larger than 0, the power reference value is set to zero.
The expression for the maximum outputtable/inputtable power of SMES is:
Pmax=Udc·Isc
due to magnet current I during charging and dischargingscThe maximum outputtable/inputtable power of the modular superconducting magnet is known to change in real time, so that the power reference value needs to be limited within the maximum outputtable/inputtable power, namely Pmin≤Pref≤Pmax
2) And (4) self-adaptive SOC feedback control. The feedback loop is shown in FIG. 6, and the feedback gain factor KscAccording to the change of the SOC range. In the free region, charging and discharging of the modular superconducting magnet are basically not restricted, but the SOC can be recovered to the SOC for the purpose of SOCref,KscTaking a value greater than 0; when the SOC of the SMES falls within the braking range region, the feedback coefficient of the SOC becomes large, and the feedback action is enhanced.
If the gain factor K is fed backscFor a fixed coefficient, a large proportion system may result in a too low utilization rate, and if the proportion coefficient is too low and the feedback link is not obvious, overcharge and overdischarge may occur. In order to fully utilize the modularized superconducting magnet and maximally improve the overall performance of energy storage of the modularized superconducting magnet, a self-adaptive coefficient is adopted. And the self-adaptive SOC feedback link can ensure that the SOC of the energy storage unit operates in a safe range. When the SOC is close to the reference value, the SOC feedback coefficient is small; when the SOC deviates more from the reference value, the feedback coefficient becomes larger.
Through the SOC controller and feedback link, the final power reference value of each module is obtained
The above is a description of another embodiment of the power distribution method for the modular superconducting magnetic energy storage system provided by the present invention, and an embodiment of the power distribution device for the modular superconducting magnetic energy storage system provided by the present invention will be described below.
Referring to fig. 3, an embodiment of a power distribution apparatus for a modular superconducting magnetic energy storage system according to the present invention includes:
a first obtaining unit 301, configured to obtain a power shortage of the modular superconducting magnetic energy storage system;
a second obtaining unit 302, configured to obtain a work done accumulated value, a maximum charge-discharge power, a charge state, and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
the sorting unit 303 is configured to perform master-slave sorting on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the state of charge and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system, so as to obtain a modular superconducting magnet sequence;
an initial power distribution unit 304, configured to perform power distribution on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the modular superconducting magnet sequence and according to the power shortage, and calculate an initial power reference value of each modular superconducting magnet;
the feedback adjusting unit 305 is configured to input the initial power reference value of each modular superconducting magnet into a corresponding state of charge controller, and obtain a final power reference value through feedback adjustment of the state of charge controller.
The above is a description of an embodiment of the modular superconducting magnetic energy storage system power distribution apparatus provided by the present invention, and another embodiment of the modular superconducting magnetic energy storage system power distribution apparatus provided by the present invention will be described below.
Referring to fig. 4, another embodiment of a modular superconducting magnetic energy storage system power distribution apparatus according to the present invention includes:
a first obtaining unit 401, configured to obtain a power shortage of the modular superconducting magnetic energy storage system;
a second obtaining unit 402, configured to obtain a work done accumulated value, a maximum charge-discharge power, a state of charge, and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
the sorting unit 403 is configured to perform master-slave sorting on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the state of charge, and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system, so as to obtain a modular superconducting magnet sequence;
the sorting unit 403 specifically includes:
the first sequencing subunit 4031 is configured to perform primary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system from small to large according to the work done accumulated value;
the second sorting subunit 4032 is used for performing secondary sorting on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charging and discharging power from large to small;
the third sequencing subunit 4033 is used for sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for three times from large to small according to the charge states;
a fourth sorting subunit 4034, configured to, if there are two or more modular superconducting magnets in the first sorting, the second sorting, and the third sorting that the work done accumulated value, the maximum charge-discharge power, or the state of charge of the modular superconducting magnets are the same, sort the modular superconducting magnets according to a fixed serial number;
a fifth sorting subunit 4035, configured to obtain a modular superconducting magnet sequence according to the work done accumulated value, the maximum charge-discharge power, and the preset sorting of the states of charge, in combination with the results of the primary sorting, the secondary sorting, and the tertiary sorting;
an initial power distribution unit 404, configured to perform power distribution on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the modular superconducting magnet sequence and according to the power shortage, and calculate an initial power reference value of each modular superconducting magnet;
the feedback adjusting unit 405 is configured to input the initial power reference value of each modular superconducting magnet into a corresponding state of charge controller, and obtain a final power reference value through feedback adjustment of the state of charge controller;
the feedback adjusting unit 405 includes:
the first judging unit 4051 is configured to judge whether the real-time state of charge is within an operable range, if not, set a power reference value of the modular superconducting magnet to zero, and if so, skip to the second judging unit;
a second determining unit 4052, configured to determine whether the real-time state of charge is within the braking region, if so, increase a feedback gain coefficient in the state of charge controller until the real-time state of charge is not within the braking region, and if not, output a final power reference value of the modular superconducting magnet according to the real-time state of charge.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A power distribution method for a modular superconducting magnetic energy storage system is characterized by comprising the following steps:
acquiring the power shortage of the modular superconducting magnetic energy storage system;
acquiring a work doing accumulated value, maximum charge-discharge power, a charge state and a fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
performing master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work doing accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence;
according to a modularized superconducting magnet sequence, performing power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
and inputting the initial power reference value of each modular superconducting magnet into the corresponding state of charge controller, and obtaining a final power reference value through feedback regulation of the state of charge controller.
2. The method for power distribution of the modular superconducting magnetic energy storage system according to claim 1, wherein the master-slave sequencing of the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the state of charge and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain the sequence of the modular superconducting magnets specifically comprises:
sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for the first time from small to large according to the work done accumulated value;
performing secondary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charge-discharge power from large to small;
carrying out three times of sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the charge states from large to small;
if the work accumulated value, the maximum charge-discharge power or the charge state of two or more modular superconducting magnets are the same in the primary sorting, the secondary sorting and the tertiary sorting, sorting is carried out according to a fixed serial number;
and obtaining a modular superconducting magnet sequence according to the work doing accumulated value, the maximum charge-discharge power and the preset sequencing of the state of charge and by combining the results of the primary sequencing, the secondary sequencing and the tertiary sequencing.
3. The power distribution method of the modular superconducting magnetic energy storage system according to claim 1, wherein the feedback regulation of the state-of-charge controller specifically comprises:
s51, judging whether the real-time charge state is in the operable range, if not, setting the initial power reference value of the modularized superconducting magnet to be zero, and if so, executing a step S52;
and S52, judging whether the real-time charge state is in a braking region, if so, increasing a feedback gain coefficient in the charge state controller until the real-time charge state is not in the braking region, and if not, outputting a final power reference value of the modular superconducting magnet according to the real-time charge state.
4. A modular superconducting magnetic energy storage system power distribution apparatus, comprising:
the first acquisition unit is used for acquiring the power shortage of the modular superconducting magnetic energy storage system;
the second acquisition unit is used for acquiring the work doing accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system;
the sequencing unit is used for carrying out master-slave sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the work done accumulated value, the maximum charge-discharge power, the charge state and the fixed serial number of each modular superconducting magnet in the modular superconducting magnetic energy storage system to obtain a modular superconducting magnet sequence;
the initial power distribution unit is used for carrying out power distribution on the modularized superconducting magnets in the modularized superconducting magnetic energy storage system according to the modularized superconducting magnet sequence and the power shortage, and calculating an initial power reference value of each modularized superconducting magnet;
and the feedback adjusting unit is used for inputting the initial power reference value of each modularized superconducting magnet into the corresponding state-of-charge controller, and obtaining a final power reference value through feedback adjustment of the state-of-charge controller.
5. The modular superconducting magnetic energy storage system power distribution apparatus of claim 4, wherein the sequencing unit specifically comprises:
the first sequencing subunit is used for sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for the first time from small to large according to the work done accumulated value;
the second sequencing subunit is used for performing secondary sequencing on the modular superconducting magnets in the modular superconducting magnetic energy storage system according to the maximum charging and discharging power from large to small;
the third sequencing subunit is used for sequencing the modular superconducting magnets in the modular superconducting magnetic energy storage system for three times according to the charge states from large to small;
the fourth sequencing subunit is used for sequencing according to a fixed serial number if the work done accumulated value, the maximum charge-discharge power or the charge state of two or more modularized superconducting magnets are the same in the primary sequencing, the secondary sequencing and the tertiary sequencing;
and the fifth sequencing subunit is used for obtaining the modular superconducting magnet sequence according to the work doing accumulated value, the maximum charge-discharge power and the preset sequencing of the state of charge and combining the results of the primary sequencing, the secondary sequencing and the tertiary sequencing.
6. The modular superconducting magnetic energy storage system power distribution apparatus of claim 4, wherein the feedback regulation unit comprises:
the first judging unit is used for judging whether the real-time charge state is in an operable range, if not, setting the initial power reference value of the modularized superconducting magnet to be zero, and if so, skipping to the second judging unit;
and the second judging unit is used for judging whether the real-time charge state is in the braking region, if so, increasing a feedback gain coefficient in the charge state controller until the real-time charge state is not in the braking region, and if not, outputting a final power reference value of the modularized superconducting magnet according to the real-time charge state.
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