CN115207900A - Anti-reflux control method of micro-grid system and micro-grid system - Google Patents
Anti-reflux control method of micro-grid system and micro-grid system Download PDFInfo
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- CN115207900A CN115207900A CN202110381597.9A CN202110381597A CN115207900A CN 115207900 A CN115207900 A CN 115207900A CN 202110381597 A CN202110381597 A CN 202110381597A CN 115207900 A CN115207900 A CN 115207900A
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- 230000000151 anti-reflux effect Effects 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004146 energy storage Methods 0.000 claims description 213
- 230000004044 response Effects 0.000 claims description 81
- 230000002265 prevention Effects 0.000 claims description 74
- 230000008859 change Effects 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 9
- 238000010248 power generation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 102220015909 rs138331646 Human genes 0.000 claims description 3
- 102220094044 rs876659948 Human genes 0.000 claims description 3
- 238000010992 reflux Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 11
- 230000009467 reduction Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—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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- 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
- H02J3/381—Dispersed generators
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to the technical field of energy management, in particular to an anti-reflux control method for a micro-grid system. The invention also relates to a micro-grid system applying the anti-reflux control method, which can effectively avoid the occurrence of reflux.
Description
Technical Field
The invention relates to the technical field of energy management, in particular to an anti-reflux control method for a micro-grid system and the micro-grid system applying the anti-reflux control method.
Background
The existing distributed power system (such as a photovoltaic system) has the characteristics of intermittence, randomness, low response speed, small inertia and the like, is difficult to control, and is easy to cause voltage fluctuation and flicker of a power grid once a reverse current occurs after the distributed power system is connected with the power grid, so that the reverse current prevention control is required to ensure the stability of the power grid system. The existing anti-reflux control technology has the following problems:
1. the anti-reflux regulation rate is slow, the reliability is low, and the anti-reflux failure is caused;
2. the backflow prevention has been achieved only by switching off the distributed power system, but causes a waste of resources.
Based on the problems, the invention provides the anti-reflux control method for the micro-grid system, which can adjust the target power to a proper value in time when the reflux is released, and accurately judge the intervention time, thereby ensuring the stability of the micro-grid system and the benefit of a user.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an anti-reflux control method of a micro-grid system, which can execute reasonable anti-reflux measures according to the current state of the micro-grid system and realize stable and reliable anti-reflux control; the micro-grid system is also provided, and stable and reliable anti-backflow control is realized by applying the anti-backflow control method.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-reflux control method for a micro-grid system comprises the following steps:
step 2, comprising step 2a and step 2b:
step 2a, if the power value P01 of the gateway table is smaller than or equal to an anti-backflow threshold value P11, judging that the current state of the micro-grid system is an emergency anti-backflow state and implementing an emergency anti-backflow measure; if the power value P01 of the gateway table is larger than the backflow prevention threshold value P11, executing a step 2b;
step 2b, if the power value P01 of the gateway table is larger than an anti-reflux threshold value P11 and smaller than an anti-reflux threshold value P12, and the anti-reflux threshold value P11 is smaller than the anti-reflux threshold value P12, predicting the counter-current occurrence time T0 according to the first change rate dP01 and the anti-reflux threshold value P11, judging that the current state of the microgrid system is an emergency anti-reflux state or a general anti-reflux state according to the counter-current occurrence time T0, and implementing emergency anti-reflux measures or general anti-reflux measures;
and if the power value P01 of the gateway table is larger than or equal to the backflow prevention threshold value P12, executing the step 1.
Preferably, the microgrid system comprises a gateway table, and the power value P01 of the gateway table is obtained by reading data of the gateway table; or if the micro-grid system is not provided with a gateway table, the power value P01 of the gateway table is = the total generated power in the system + the total discharge power in the system-the total load power in the system.
Preferably, the first rate of change dP01= (P012-P011)/dT 01;
wherein, dT01 is the collection period of the power value P01 of the gate table, P011 is the power value of the gate table of the previous sampling period of the current sampling period, P012 is the power value of the gate table of the next sampling period of the current collection period, and the calculation period of the first change rate dP01 is the same as dT 01.
Preferably, the emergency counter-flow prevention measure and the general counter-flow prevention measure are restricted by the following rules:
according to a first rule, devices of the microgrid system are sorted according to real-time power, and the devices which are sorted in the front are preferentially controlled;
according to the second rule, classifying each device according to the response time of each device of the microgrid system, and performing power control or shutdown control on the corresponding device according to the type of the device;
according to a third rule, the microgrid system comprises distributed power supply equipment and energy storage equipment, and the energy storage equipment is preferentially controlled;
the priority order of the above three rules is: rule three > rule one > rule two.
Preferably, for any device in the microgrid system, the power difference value of the power setting of the two adjacent front and back times is dPi, the power setting return difference value is dP, the time interval of the power setting of the two front and back times is dPiT, and the time setting return difference value is dPT; if dPi is not less than dP or dPiT is not less than dPT, the energy management system of the microgrid system issues a power scheduling command to the equipment.
Preferably, the backflow prevention threshold value P11=0.0kW, and the backflow prevention threshold value P12=1.0kW.
Preferably, the microgrid system executes emergency backflow prevention measures or general backflow prevention measures to ensure that Ps is more than or equal to 0.0, ps = P01 × a and 1.0 < a < 2.0; wherein Ps is the weighted value of the power of the gateway table.
Preferably, in step 2a, the countercurrent occurrence time T0= (P01-P11)/dP 01; if T0+ Tmax is larger than 0.0, judging that the current state of the micro-grid system is an emergency countercurrent state and implementing emergency countercurrent prevention measures; if T0+ Tmax is less than or equal to 0.0, judging that the current state of the micro-grid system is a general anti-reflux state and implementing general anti-reflux measures;
and the Tmax is the response time of the device with the longest response time in the distributed power supply device and the energy storage device of the microgrid system.
Preferably, the emergency counter-flow prevention measures include an energy storage device emergency counter-flow prevention measure and a power supply device emergency counter-flow prevention measure, and the priority of the energy storage device emergency counter-flow prevention measure is higher than that of the power supply device emergency counter-flow prevention measure.
Preferably, the emergency anti-backflow measure of the energy storage device comprises the following operations: all energy storage devices are sorted from large to small according to real-time power, and the energy storage device closest to the top is an energy storage device i max According to energy storage device i max Response time T3i max And response time index T11 to energy storage device i max Classifying if the response time T3i is max T11 is less than or equal to, then the energy storage device i max The type of the energy storage device is quick response energy storage device and power control is carried out on the energy storage device, if the response time is T3i max If T11 is greater, the energy storage device i max The type of the energy storage device is slow response energy storage device and the shutdown control is carried out on the energy storage device.
Preferably, in the emergency backflow prevention measure of the energy storage device, the energy storage device i is subjected to max In power control, the energy storage device i max Is SOC of max If SOC is max Not less than 100.0 and energy storage device i max In the discharging state, the energy storage device i is lowered max Discharge power P3i max (ii) a If SOC max If < 100.0, the energy storage device i is increased max The charging power of (1).
Preferably, in the emergency backflow prevention measure of the energy storage device, the energy storage device i is subjected to max Performing power controlWhen, if SOC is max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time return difference value dP3T is obtained, the energy management system of the micro-grid system sends the energy storage device i max Issuing power scheduling command and increasing energy storage equipment i max The charging power of (1).
Preferably, the power supply equipment emergency anti-backflow measure comprises the following operations: all distributed power supply equipment is sorted from large to small according to real-time power, and the distributed power supply equipment which is the most front sorted is power supply equipment i max According to the power supply device i max Response time T2i max And response time index T11 to power supply device i max Classifying if the response time T2i is max The response time index T11 is less than or equal to, the power supply equipment i max Is a fast response power supply device and performs power control on the fast response power supply device if the response time is T2i max > response time index T11, the power supply device i max Is a slow response power supply device and performs shutdown control on the slow response power supply device.
Preferably, in the emergency backflow prevention measure of the power supply equipment, the power supply equipment i is subjected to max When power control is performed, if the power supply device i max Real-time power P2i max < Power supply device i max Rated power P2Ei max Then to the power supply device i max Transmitting a power setting command to make the power supply device i max Reducing the power generation power; if the real-time power P2i max Not less than rated power P2Ei max Then to the power supply device i max And performing shutdown control.
Preferably, in the emergency backflow prevention measure of the power supply equipment, the power supply equipment i is subjected to max When performing power control, if the real-time power P2i max < rated Power P2Ei max And a power supply device i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply devicei max A power setting time interval dP2iT of two times before and after max Power supply apparatus i max The time return difference value dP2T is obtained, and the energy management system of the micro-grid system sends power equipment i to the power equipment max Issuing power scheduling command to enable power supply equipment i max The generated power is reduced.
Preferably, the general anti-backflow measures include a general anti-backflow measure of the energy storage device and a general anti-backflow measure of the power supply device, and the priority of the general anti-backflow measure of the energy storage device is higher than that of the general anti-backflow measure of the power supply device.
Preferably, the energy storage device general backflow prevention measure comprises the following operations: the energy storage devices of the micro-grid system are sorted from large to small according to real-time power, and the energy storage device closest to the top of the sorting is the energy storage device i max Energy storage device i max Is SOC of max If SOC is max If the current value is less than 100.0, the energy management system of the micro-grid system supplies energy to the energy storage device i max Sending a power setting command to enable the energy storage device i max Increasing the charging power; if SOC max If the current value is more than or equal to 100.0, the energy management system sends the energy storage device i max Sending a power setting command to enable the energy storage device i max The discharge power is reduced to 0.
Preferably, the energy storage device is generally in a counter-current prevention measure, if SOC max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time return difference value dP3T, the energy management system sends the energy storage device i max Issuing power scheduling command to enable energy storage equipment i max The charging power is increased.
Preferably, the general anti-backflow measure of the power supply apparatus includes the following operations: the distributed power supply equipment of the micro-grid system is sorted from large to small according to real-time power, and the distributed power supply equipment with the top sorting is power supply equipment i max Energy management system to power supply device i max Transmit a power setting command toPower supply apparatus i max The generated power is reduced.
Preferably, in the general anti-backflow measure of the power supply device, if the power supply device i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply device i max A power setting time interval dP2iT of two times before and after max Power supply apparatus i max The time difference dP2T, the energy management system sends the power supply device i max Issuing power scheduling command to enable power supply equipment i max The generated power is reduced.
The micro-grid system applies the anti-reflux control method; the micro-grid system comprises an energy management system, an auxiliary control system, a distributed power system and an energy storage system; the distributed power supply system comprises distributed power supply equipment and an inverter which are matched for use, and is connected to the microgrid system through a switch K2; the energy storage system comprises a transformer T1, and an energy storage battery and a PCS which are used in a matched mode, wherein each PCS is connected with one side of the transformer T1, and the other side of the transformer T1 is connected into the microgrid system through a switch K1; the micro-grid system is connected with a public power supply through a switch K0 and is connected with a load through a switch K3; the auxiliary control system comprises electric meters KMH1, KMH2 and KMH3 which are respectively in communication connection with the energy management system, wherein the electric meters KMH2 are arranged between the switch K1 and the transformer T1, the electric meters KMH1 are arranged between the switch K0 and the distributed power system and the energy storage system, and the electric meters KMH3 are arranged between the switch K0 and the switch K2.
According to the anti-backflow control method for the micro-grid system, the current state of the micro-grid system is classified into an emergency anti-backflow state and a general anti-backflow state, and an emergency anti-backflow measure and a general anti-backflow measure are correspondingly implemented, so that the accuracy and concreteness of the anti-backflow control of the micro-grid system are realized, and the anti-backflow control effect is improved. In addition, the emergency anti-reflux measures and the general anti-reflux measures of the anti-reflux control method of the micro-grid system are implemented according to the rules, so that the anti-reflux control efficiency can be obviously improved, and the anti-reflux control effect can be improved.
The micro-grid system can effectively avoid the occurrence of reverse flow by applying the reverse flow prevention control method.
Drawings
FIG. 1a is a schematic flow diagram of a method for controlling anti-reflux in a microgrid system according to the present invention;
FIG. 1b is an enlarged schematic view of portion A of FIG. 1a according to the present invention;
FIG. 1c is an enlarged schematic view of portion B of FIG. 1a according to the present invention;
fig. 2 is a schematic diagram of a microgrid system of the present invention.
Detailed Description
The following description will further illustrate the anti-backflow control method for the microgrid system and a specific implementation mode of the microgrid system using the anti-backflow control method according to the present invention with reference to the examples shown in fig. 1-2. The anti-backflow control method of the micro-grid system and the micro-grid system to which the anti-backflow control method is applied of the present invention are not limited to the description of the following embodiments.
The invention discloses an anti-reflux control method of a micro-grid system, which comprises the following steps of:
step 2, comprising step 2a and step 2b:
step 2a, if the power value P01 of the gateway table is smaller than or equal to an anti-backflow threshold value P11, judging that the current state of the micro-grid system is an emergency anti-backflow state and implementing an emergency anti-backflow measure; if the power value P01 of the gateway table is larger than the backflow prevention threshold value P11, executing a step 2b;
step 2b, if the power value P01 of the gateway table is greater than the anti-reflux threshold value P11 and smaller than the anti-reflux threshold value P12, and the anti-reflux threshold value P11 is smaller than the anti-reflux threshold value P12, predicting the counter-current occurrence time T0 according to the first change rate dP01 and the anti-reflux threshold value P11, judging that the current state of the microgrid system is an emergency anti-reflux state or a general anti-reflux state according to the counter-current occurrence time T0, and implementing emergency anti-reflux measures or general anti-reflux measures; and if the power value P01 of the gateway table is larger than or equal to the backflow prevention threshold value P12, executing the step 1.
According to the anti-countercurrent control method for the micro-grid system, the current state of the micro-grid system is classified into an emergency anti-countercurrent state and a general anti-countercurrent state, and an emergency anti-countercurrent measure and a general anti-countercurrent measure are correspondingly implemented, so that the accuracy and concreteness of the anti-countercurrent control of the micro-grid system are realized, and the anti-countercurrent control effect is improved.
Preferably, the countercurrent occurrence time T0= (P01-P11)/dP 01; if T0+ Tmax is larger than 0.0, judging that the current state of the micro-grid system is an emergency countercurrent state and implementing emergency countercurrent prevention measures; if T0+ Tmax is less than or equal to 0.0, judging that the current state of the micro-grid system is a general anti-reflux state and implementing general anti-reflux measures; and the Tmax is the response time of the device with the longest response time in the distributed power supply device and the energy storage device of the microgrid system.
Preferably, the microgrid system executes emergency backflow prevention measures or general backflow prevention measures to ensure that Ps is more than or equal to 0.0, ps = P01 × a and 1.0 < a < 2.0; wherein Ps is the weighted value of the power of the gateway table. Further, a =1.3.
Preferably, the microgrid system comprises a gateway table, and the power value P01 of the gateway table is obtained by reading data of the gateway table; or if the micro-grid system is not provided with a gateway table, the power value P01 of the gateway table is = the total generated power in the system + the total discharge power in the system-the total load power in the system. It is to be noted that the utility meter is a grid meter, for example, the meter KMH1 in fig. 2.
Preferably, the emergency counter-flow prevention measure and the general counter-flow prevention measure are implemented according to the following rules:
according to a first rule, sorting the devices of the microgrid system from large to small according to real-time power, and preferentially controlling the devices which are sorted in front;
according to the second rule, classifying each device according to the response time of each device of the microgrid system, and performing power reduction or shutdown control on the corresponding device according to the type of the device;
according to a third rule, the microgrid system comprises distributed power supply equipment and energy storage equipment, and the energy storage equipment is preferentially controlled;
the priority order of the above three rules is: rule three > rule one > rule two.
According to the anti-reflux control method of the micro-grid system, the emergency anti-reflux measures and the general anti-reflux measures are implemented according to the rules, so that the anti-reflux control efficiency can be obviously improved, and the anti-reflux control effect can be improved.
Preferably, in any device in the microgrid system, the power difference value of the power setting of the two adjacent front and back devices is dPi, the power setting return difference value is dP, the time interval of the power setting of the two front and back devices is dPiT, and the time setting return difference value is dPT; if dPi is not less than dP or dPiT is not less than dPT, an Energy Management System (EMS) of the micro-grid system issues a power scheduling command to the equipment to be adjusted. By the process, the situation that the performance of the equipment is influenced because an Energy Management System (EMS) of the micro-grid system frequently issues the power setting command to the equipment is avoided, and the reliability of the power setting command is ensured.
The invention also discloses a micro-grid system applying the anti-reflux control method, which can effectively avoid the occurrence of reflux.
The following is an embodiment of the anti-backflow control method of the microgrid system.
The invention discloses an anti-reflux control method of a micro-grid system, which comprises the following steps:
Preferably, the microgrid system comprises a gateway table (namely a power grid electric meter), and a power value P01 of the gateway table is obtained by reading data of the gateway table; or if the micro-grid system is not provided with a gateway table, the power value P01 of the gateway table is = the total generated power in the system + the total discharge power in the system-the total load power in the system.
Preferably, the first rate of change dP01= (P012-P011)/dT 01;
wherein, dT01 is the collection period of the power value P01 of the gate table, P011 is the power value of the gate table of the previous sampling period of the current sampling period, P012 is the power value of the gate table of the next sampling period of the current collection period, and the calculation period of the first change rate dP01 is the same as dT 01.
Step 2, comprising step 2a and step 2b:
step 2a, if the power value P01 of the gateway table is smaller than or equal to a backflow prevention threshold value P11, an Energy Management System (EMS) judges that the current state of the micro-grid system is an emergency backflow prevention state and implements an emergency backflow prevention measure; and if the power value P01 of the gateway table is larger than the backflow prevention threshold value P11, executing the step 2b.
Preferably, in step 2a, the countercurrent occurrence time T0= (P01-P11)/dP 01; if T0+ Tmax is larger than 0.0, an Energy Management System (EMS) judges that the current state of the micro-grid system is an emergency countercurrent state and implements emergency countercurrent prevention measures; if T0+ Tmax is less than or equal to 0.0, the Energy Management System (EMS) judges that the current state of the micro-grid system is a general anti-reflux state and implements general anti-reflux measures; and the Tmax is the response time of the device with the longest response time in the distributed power supply device and the energy storage device of the microgrid system.
Preferably, the backflow prevention threshold value P11=0.0kW, and the backflow prevention threshold value P12=1.0kW.
It should be noted that, theoretically, in the countercurrent control method of the present invention, as long as P11 is less than P12, the values of the two are not absolutely limited; however, for practical purposes, the preferable range of P11 is 0.0 kW.ltoreq.P 11< 1.0kW, and the preferable range of P12 is P12.gtoreq.1.0 kW. In addition, the value of P12 is related to the speed of the device response to the reverse flow, if the device response is slow, the reverse flow prevention processing needs to be performed as early as possible, so that the value of P12 is relatively large, but if the value of P12 is too large, the utilization rate of the distributed power supply device is inhibited.
Step 2b, if the power value P01 of the gateway table is larger than the anti-reflux threshold value P11 and smaller than the anti-reflux threshold value P12, and the anti-reflux threshold value P11 is smaller than the anti-reflux threshold value P12, predicting the counter-current occurrence time T0 by an Energy Management System (EMS) according to the first change rate dP01 and the anti-reflux threshold value, judging that the current state of the microgrid system is an emergency anti-reflux state or a general anti-reflux state according to the counter-current occurrence time T0, and implementing emergency anti-reflux measures or general anti-reflux measures; and if the power value P01 of the gateway table is larger than the backflow prevention threshold value P12, executing the step 1.
Preferably, the micro-grid system executes an emergency anti-reflux measure or a general anti-reflux measure, so that Ps is more than or equal to 0.0, ps = P01 × a, and 1.0 < a < 2.0; wherein Ps is the weighted value of the power of the gateway table. Further, a =1.3. It should be noted that the purpose of Ps is to reserve an adjustment margin, so as to ensure that the anti-reflux control can be completed by one-time adjustment, and prevent multiple adjustments; the initial value of Ps is generally a negative value, and the adjusted value is deducted from Ps every time adjustment is carried out until the Ps becomes a positive number, namely that the adjustment is in place, and the countercurrent adjustment is quitted; the coefficient a can be adjusted, so that when the backflow is adjusted for the first time, more devices can be adjusted, rather than being adjusted to the right value, because the power change of some devices is a curve, when the backflow is found, the backflow is adjusted according to the value at the moment, and the backflow can occur again after the adjustment is completed, so that the value of a is greater than 1.0, but the value of a cannot be set too large, generally less than 2.0, in consideration of the stability of a power grid.
Preferably, the emergency counter-flow prevention measures include an energy storage device emergency counter-flow prevention measure and a power supply device emergency counter-flow prevention measure, and the priority of the energy storage device emergency counter-flow prevention measure is higher than that of the power supply device emergency counter-flow prevention measure. It should be noted that the meaning of the "emergency backflow prevention measure of the energy storage device has a higher priority than the emergency backflow prevention measure of the power supply device" is that when the emergency backflow prevention measure is executed by the microgrid system, the emergency backflow prevention measure of the energy storage device is executed first, the energy storage device is controlled in a backflow prevention manner, and if Ps can be adjusted to be more than or equal to 0.0, the emergency backflow prevention measure of the power supply device is not executed, that is, the control of the distributed power supply device in a backflow prevention manner is not executed; if Ps is still less than 0.0 after the emergency anti-reflux measure of the energy storage system is executed, the micro-grid system continues to execute the emergency anti-reflux measure of the power system until Ps is more than or equal to 0.
The emergency anti-backflow measure of the energy storage device comprises the following operations: all energy storage devices are sorted according to real-time power from large to small, and the energy storage device with the top sorting is sortedThe device being an energy storage device i max According to energy storage device i max Response time T3i max And response time index T11 to energy storage device i max Classifying if the response time T3i is max T11 is less than or equal to, then the energy storage device i max The type of the energy storage device is quick response energy storage device and power control is carried out on the energy storage device, if the response time is T3i max If T11 is greater, the energy storage device i max The type of the energy storage device is slow response energy storage device and the shutdown control is carried out on the energy storage device; t11 is more than 0s and less than or equal to 5s. Furthermore, in the emergency anti-reflux measure of the energy storage device, the energy storage device i is subjected to max In power control, the energy storage device i max Is SOC of max If SOC is max Not less than 100.0 and energy storage device i max In the discharging state, the energy storage device i is lowered max Discharge power P3i max (ii) a If SOC max If < 100.0, the energy storage device i is increased max The charging power of (1). Furthermore, in the emergency anti-reflux measure of the energy storage device, the energy storage device i is subjected to max When performing power control, if SOC max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time return difference value dP3T, then the Energy Management System (EMS) sends the energy storage device i max Issuing power scheduling command and increasing energy storage equipment i max The charging power of (1).
The emergency anti-reverse flow measure of the power supply equipment comprises the following operations: all distributed power supply equipment is sorted from large to small according to real-time power, and the distributed power supply equipment which is the most front sorted is power supply equipment i max According to the power supply device i max Response time T2i max And response time index T11 to power supply device i max Classifying if the response time T2i is max The response time index T11 is less than or equal to, the power supply equipment i max Is a fast response power supply device and performs power control on the fast response power supply device if the response time is T2i max > response time index T11, the power supply device i max Is slowResponding to the power supply equipment and performing shutdown control on the power supply equipment. Further, in the emergency anti-reverse-flow measure of the power supply equipment, the power supply equipment i is subjected to max When power control is performed, if the power supply device i max Real-time power P2i max < Power supply device i max Rated power P2Ei max Then to the power supply device i max Transmitting a power setting command to make the power supply device i max Reducing the power generation power; if the real-time power P2i max Not less than rated power P2Ei max Then to the power supply device i max And performing shutdown control. Further, in the emergency anti-reverse-flow measure of the power supply equipment, the power supply equipment i is subjected to max When performing power control, if the real-time power P2i max < rated Power P2Ei max And a power supply device i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply device i max A power setting time interval dP2iT of two times before and after max Power supply apparatus i max The time back difference value dP2T, then the Energy Management System (EMS) sends power supply equipment i max Sending down power scheduling command to enable power supply equipment i max The generated power is reduced.
It should be noted that, T11 is set as the time response index of backflow prevention, and the unit is seconds, in a specific network, the communication delay is generally small, and is also fixed, and this value can be adjusted by T11, so that T11=2.0s.
The general anti-reflux measures comprise general anti-reflux measures of energy storage equipment and general anti-reflux measures of power supply equipment, and the priority of the general anti-reflux measures of the energy storage equipment is higher than that of the general anti-reflux measures of the power supply equipment. It should be noted that the meaning of "the priority of the general anti-backflow measure of the energy storage device is higher than that of the general anti-backflow measure of the power supply device" is that when the general anti-backflow measure of the microgrid system is executed, the general anti-backflow measure of the energy storage device is executed first, the anti-backflow control is performed on the energy storage device first, if Ps can be adjusted to be larger than or equal to 0.0, the general anti-backflow measure of the power supply device is not executed any more, that is, the anti-backflow control is not performed on the distributed power supply device any more; if Ps is still less than 0.0 after the general anti-reflux measures of the energy storage system are executed, the micro-grid system continues to execute the general anti-reflux measures of the power system until Ps is more than or equal to 0.
The energy storage device general anti-reflux measures comprise the following operations: the energy storage devices of the micro-grid system are sorted from large to small according to real-time power, and the energy storage device closest to the top of the sorting is the energy storage device i max Energy storage device i max Is SOC of max If SOC is max If < 100.0, the Energy Management System (EMS) sends the energy storage device i max Sending a power setting command to enable the energy storage device i max Increasing the charging power; if SOC max More than or equal to 100.0, the Energy Management System (EMS) sends the energy storage device i max Sending a power setting command to enable the energy storage device i max The discharge power is reduced to 0. Further, the energy storage device is generally in a counter-current prevention measure, if SOC max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time difference dP3T, then the Energy Management System (EMS) sends the energy storage device i max Issuing power scheduling command to enable energy storage equipment i max The charging power is increased.
The general anti-reflux measures of the power supply apparatus include the following operations: distributed power supply equipment of the microgrid system is sorted from large to small according to real-time power, and the distributed power supply equipment with the top sorting is power supply equipment i max Energy Management System (EMS) to Power Source device i max Transmitting a power setting command to make the power supply device i max The generated power is reduced. Further, in the general anti-reverse-flow measure of the power supply device, if the power supply device i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply device i max Two times before and after power setting time interval dP2iT max Power supply apparatus i max The time difference dP2T, then the Energy Management System (EMS) sends the power supply equipmenti max Issuing power scheduling command to enable power supply equipment i max The generated power is reduced.
Preferably, the emergency anti-reflux measures and the general anti-reflux measures are subject to the following rules:
according to a first rule, the devices (all distributed power supply devices and energy storage devices) of the microgrid system are sorted according to the real-time power, and the devices which are sorted in the front are preferentially controlled. Furthermore, in the microgrid system, devices of the same type (that is, distributed power supply devices are devices of one type, and energy storage devices are devices of another type) are grouped and sorted according to the real-time power.
Specifically, in the microgrid system, all distributed energy storage devices are grouped and sorted according to the real-time power, and all energy storage devices are grouped and sorted according to the real-time power. It should be noted that, if the real-time powers of two or more energy storage devices are the same and the real-time power is the maximum value, the energy storage device with the maximum real-time power appearing first is arranged at the first position according to the first-come-last-come principle; the sequence of the energy storage devices is arranged according to the device number ID of the energy storage devices from large to small.
It should be noted that, in rule one, all devices in the microgrid system may be sorted according to real-time power level.
And according to a second rule, classifying each device according to the response time of each device of the microgrid system, and performing power reduction or shutdown control on the corresponding device according to the type of each device. Further, in the microgrid system: if the response time of the equipment is larger than the response time threshold, judging that the equipment is slow response equipment and performing shutdown control on the equipment; if the response time of the equipment is less than or equal to the response time threshold, judging that the equipment is fast response equipment and performing power reduction control on the equipment; the response time threshold is more than or equal to 400ms and less than or equal to 600ms. Further, the response time threshold is 500ms.
And according to a third rule, the microgrid system comprises distributed power supply equipment and energy storage equipment, and the energy storage equipment is preferentially controlled.
The priority order of the above three rules is: rule three > rule one > rule two.
Specifically, when the emergency backflow prevention measure or the general backflow prevention measure is executed, firstly, the emergency backflow prevention measure or the general backflow prevention measure is constrained by a rule three, that is, the energy storage devices are preferentially controlled in distributed power supply devices and energy storage devices of the microgrid system, then, the emergency backflow prevention measure or the general backflow prevention measure is constrained by a rule one, that is, when the energy storage devices are controlled, the energy storage devices are firstly sorted according to the real-time power, the energy storage devices which are the most-front sorted (that is, the real-time power is the largest) are preferentially controlled, then, the emergency backflow prevention measure or the general backflow prevention measure is constrained by a rule two, that is, the type (belonging to slow response devices or fast response devices) of the energy storage devices is judged according to the response time of the energy storage devices, and the power reduction or shutdown control is performed on the energy storage devices according to the type of the energy storage devices.
Preferably, the response time is a time between a time when the device receives the power scheduling command and a time when the actual output power of the device is stable. Further, the response time of the device is obtained by setting the initial power of the device to 0, writing a power value to the device (that is, sending a power scheduling instruction to the device), then reading the actual power value of the device, and reading the time when the actual power value is the same as the written power value, that is, the response time.
Preferably, for any device in the microgrid system, the power difference value of the power setting of the two adjacent front and back times is dPi, the power setting return difference value is dP, the time interval of the power setting of the two front and back times is dPiT, and the time setting return difference value is dPT; if dPi is greater than or equal to dP or dPiT is greater than or equal to dPT, an Energy Management System (EMS) of the microgrid system issues a command to the device.
The following is another embodiment of the anti-backflow control method of the microgrid system.
As shown in fig. 2, the microgrid system of the present invention includes N distributed power devices and M energy storage devices, where N and M are both integers greater than 0 (the values of N and M may be the same or different).
The distributed power supply equipment is preferably photovoltaic equipment, and of the N distributed power supply equipment, the ith distributed power supply equipment is power supply equipment i: the real-time power is P2i, the rated power is P2Ei, the response time is T2i, the power difference value set by the power of the two adjacent times is dP2i, the power setting return difference value is dP2, the time interval set by the power of the two adjacent times is dP2iT, and the time setting return difference value is dP2T; and the real-time total power generation power of the N distributed power supply devices is P20.
Among the M energy storage devices, the ith energy storage device is an energy storage device i: the real-time power is P3i, the rated charging power is P3Ei, the response time is T3i, the power difference value set by the power Of the two adjacent times is dP3i, the power setting back difference value is dP3, the power setting time interval Of the two adjacent times is dP3iT, the time back difference value is dP3T, and the SOC (State Of Charge) Of the energy storage device i is SOCi.
Setting Ps = P01 × a, tmax = max { T2i, T3i }, wherein a is an adjustable coefficient, and a is more than 1.0 and less than 2.0; wherein Ps is a weighted gateway table power value, and Tmax is a response time of a device with the longest response time among all devices (including distributed power supply devices and energy storage devices) of the microgrid system. Further, a =1.3.
T11 is set as a time response index of backflow prevention, the unit is second, in a specific network, communication delay is generally small, meanwhile, the communication delay is fixed, and the value can be adjusted through T11.
The invention discloses an anti-reflux control method of a micro-grid system, which implements an emergency anti-reflux measure and a general anti-reflux measure by the following steps:
step S01, if the power value P01 of the gateway table is not more than the anti-reflux threshold value P11, turning to step S03; if the power value P01 of the gateway meter is larger than the backflow prevention threshold value P11, turning to the step S02;
step S02, if the power value P01 of the gateway meter is greater than the anti-reflux threshold value P11 and less than the anti-reflux threshold value P12, turning to step S20; if the power value P01 of the gateway meter is larger than the backflow prevention threshold value P12, turning to the step S01;
s03, sorting the devices of the micro-grid system from large to small according to the real-time power, and then turning to step 04;
step S04, setting i =0, and go to step S05;
s05, if i is larger than or equal to M, turning to the step S13; if i is less than M, turning to step S06;
step S06, if T3i is less than T11, turning to step S09; if T3i is more than or equal to T11, turning to step S12;
step S07, if Ps is more than or equal to 0.0, turning to step S01; if Ps is less than 0.0, turning to step S08;
step S08, i = i +1 and goes to step S05;
step S09, if SOCi is less than 100.0, turning to step S11; if SOCi is more than or equal to 100.0, turning to step S10;
step S10, if P3i is greater than 0.0, setting Ps = Ps + P3i, and sending a power reduction command to the energy storage device PCSi; if P3i is less than or equal to 0.0, turning to step S07;
step S11, if (dP 3i > dP 3) | (dP 3iT > dP 3T), setting Ps = Ps- (P3 Ei-P3 i), and sending an i power-down command to the energy-storage PCS equipment; turning to step S08;
step S12, if (P20 + Ps < 0) & & (P3 i > 0.0), ps = Ps + P3i, sending a shutdown command to the energy storage device PCSi; turning to step S08;
step S13, sorting the equipment of the energy management system from large to small according to the real-time power, setting i =0, and turning to step S14;
s14, if i is larger than or equal to N, turning to the step S01; if i is less than N, turning to step S15;
step S15, if T2i is less than T11, turning to step S18; if T2i is not less than T11, turning to step S16;
step S16, if T2i is larger than or equal to T11 and Ps = Ps + P2i, sending a shutdown command to the power supply device i, and turning to step S17;
s17, if Ps is more than or equal to 0.0, turning to the step S01; if Ps is less than 0.0, i = i +1 and go to step S14;
step S18, if P2i is less than P2iE, the step S19 is switched to; if P2i is not less than P2iE, turning to step S17;
step S19, if (dP 2i > dP 2) | (dP 2iT > dP 2T), ps = Ps + P2i, transmits a power setting command to the power supply apparatus i; turning to the step S17;
step S20, if ((P01-P11)/dP 01) + Tmax is less than or equal to 0.0, then go to step S21; if ((P01-P11)/dP 01) + Tmax > 0.0, go to step S03;
step S21, sorting the equipment of the energy management system from large to small according to the real-time power, setting i =0, and turning to step S22;
step S22, if i is more than or equal to M, turning to step S27; if i is less than M, turning to step S23;
step S23, if SOCi is less than 100.0, then go to step S24; if SOCi is more than or equal to 100.0, turning to step S25;
step S24, if (dP 3i > dP 3) | (dP 3iT > dP 3T), setting Ps = Ps- (P3 Ei-P3 i), and issuing a power setting command to an energy storage device PCSi; go to step S26;
step S25, if P3i is greater than 0.0 and Ps = Ps + P3i, sending a power setting command to the energy storage device PCSi, and setting the power to 0; go to step S26;
s26, if Ps is more than or equal to 0.0, turning to the step S01; if Ps is less than 0.0, turning to step S22;
step S27, sorting the equipment of the energy management system from large to small according to real-time power, setting i =0, and turning to step S28;
s28, if i is larger than or equal to N, turning to the step S01; if i is less than N, turning to step S30;
step S29, if Ps is more than or equal to 0.0, turning to step S01; if Ps < 0.0, i = i +1 and go to step S28;
step S30, if P2i is less than P2Ei, the step S31 is switched to; if P2i is not less than P2Ei, turning to step S29;
step S31, if (dP 2i > dP 2) | (dP 2iT > dP 2T), transmitting a power setting command to the power supply apparatus i, ps = Ps + P2i; go to step S29.
It should be noted that the anti-reflux control method for the micro-grid system is realized by controlling each component of the micro-grid system through an Energy Management System (EMS).
The invention also discloses a micro-grid system applying the anti-reflux control method.
As shown in fig. 2, an embodiment of the microgrid system of the present invention: the micro-grid system comprises an Energy Management System (EMS), an auxiliary control system, a distributed power system and an energy storage system; the distributed power supply system comprises distributed power supply equipment and an inverter which are matched for use, and is connected to the microgrid system through a switch K2; the energy storage system comprises a transformer T1, and an energy storage battery and a PCS which are used in a matched mode, wherein each PCS is connected with one side of the transformer T1, and the other side of the transformer T1 is connected into the microgrid system through a switch K1; the micro-grid system is connected with a public power supply through a switch K0 and is connected with a load through a switch K3; the auxiliary control system comprises electric meters KMH1, KMH2 and KMH3 which are respectively in communication connection with an Energy Management System (EMS), wherein the electric meter KMH2 is arranged between a switch K1 and a transformer T1, the electric meter KMH1 is arranged between a switch K0 and a distributed power supply system and an energy storage system, and the electric meter KMH3 is arranged between the switch K0 and the switch K2.
Preferably, as shown in fig. 2, the secondary control system further includes a DI/DO device, and the DI/DO device is disposed between the switch K2 and the switch K1.
Preferably, as shown in fig. 2, the auxiliary control system further includes an RS485 bus and an ethernet, the electric meters KMH1, KMH2, KMH3 and the DI/DO device are communicatively connected to an Energy Management System (EMS) through the RS485 bus, and the PCS of the energy storage system is communicatively connected to the Energy Management System (EMS) through the ethernet.
Specifically, as shown in fig. 2, the microgrid system includes an Energy Management System (EMS), a DI/DO module, an energy storage system, a distributed power system, a load, and a transformer T1, the energy storage system includes a plurality of PCS and a plurality of energy storage batteries, the PCS and the energy storage batteries are in one-to-one cooperation (the PCS and the energy storage batteries may not be in one-to-one cooperation, for example, one PCS is connected to more than two energy storage batteries at the same time), each PCS is connected to the EMS in a communication manner, each PCS is connected to the load, the distributed power system, and a utility power source through a transformer T1 and an electricity meter KMH2 which are sequentially connected in series, the load and the electricity meter KMH2 are connected to each other in a communication manner, a switch K3 is connected in series between the load and the electricity meter KMH2, a switch K2, an electricity meter KMH3 and a switch K1 are sequentially connected in series between the distributed power system and the electricity meter KMH2, the utility power source is connected to a node between the electricity meter KMH3 and the switch K1 through a switch K0 and a switch K1 (a switch) which are sequentially connected in series to the electricity meter, the distributed power system, the DI/DO module, the electricity meter, the KMH1, the KMH2 and the energy management system (the energy management system) are connected to each other in a communication manner. Further, the PCS is in communication connection with an Energy Management System (EMS) through an Ethernet network (namely 'Ethernet'); the distributed power system, the DI/DO module, the electric meter KMH1, the electric meter KMH2 and the electric meter KMH3 are respectively connected with the EMS in a communication mode through RS485 buses.
The electricity meter KMH1 is used for measuring electricity consumption information of the whole micro-grid system, and the KMH2 and the KMH3 are used for measuring electricity consumption information of the energy storage system and the distributed power supply system respectively.
Preferably, the energy storage battery may be a storage battery, and may also be a lithium ion battery.
Preferably, the distributed power system is a photovoltaic system.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. An anti-reflux control method of a micro-grid system is characterized by comprising the following steps:
step 1, acquiring a gateway table power value P01 of the microgrid system, and calculating the change rate of the gateway table power value P01 to be a first change rate dP01;
step 2, comprising step 2a and step 2b:
step 2a, if the power value P01 of the gateway table is smaller than or equal to an anti-backflow threshold value P11, judging that the current state of the micro-grid system is an emergency anti-backflow state and implementing emergency anti-backflow measures; if the power value P01 of the gateway table is larger than the backflow prevention threshold value P11, executing a step 2b;
step 2b, if the power value P01 of the gateway table is larger than the anti-reflux threshold value P11 and smaller than the anti-reflux threshold value P12, and the anti-reflux threshold value P11 is smaller than the anti-reflux threshold value P12, predicting the counter-current occurrence time T0 according to the first change rate dP01 and the anti-reflux threshold value P11, judging that the current state of the microgrid system is an emergency anti-reflux state or a general anti-reflux state according to the counter-current occurrence time T0, and implementing emergency anti-reflux measures or general anti-reflux measures;
and if the power value P01 of the gateway table is larger than or equal to the backflow prevention threshold value P12, executing the step 1.
2. The anti-reflux control method for the microgrid system as claimed in claim 1, characterized in that: the micro-grid system comprises a gateway table, and a power value P01 of the gateway table is obtained by reading data of the gateway table; or if the micro-grid system is not provided with a gateway table, the power value P01 of the gateway table is = the total generated power in the system + the total discharge power in the system-the total load power in the system.
3. The anti-reflux control method for the microgrid system as claimed in claim 1, characterized in that: the first rate of change dP01= (P012-P011)/dT 01;
wherein, dT01 is the collection period of the power value P01 of the gate table, P011 is the power value of the gate table of the previous sampling period of the current sampling period, P012 is the power value of the gate table of the next sampling period of the current collection period, and the calculation period of the first change rate dP01 is the same as dT 01.
4. The anti-reflux control method for the microgrid system as claimed in claim 1, characterized in that: the emergency anti-reflux measures and the general anti-reflux measures are restricted by the following rules:
according to a first rule, devices of the microgrid system are sorted according to real-time power, and the devices which are sorted in the front are preferentially controlled;
according to the second rule, classifying each device according to the response time of each device of the microgrid system, and performing power control or shutdown control on the corresponding device according to the type of the device;
according to a third rule, the microgrid system comprises distributed power supply equipment and energy storage equipment, and the energy storage equipment is controlled preferentially;
the priority order of the above three rules is: rule three > rule one > rule two.
5. The anti-reflux control method for the microgrid system as claimed in claim 1, characterized in that: any device in the microgrid system has a power difference value of dPi between two adjacent power settings, a power setting return difference value of dP, a power setting time interval of dPiT between the two adjacent power settings, and a time setting return difference value of dPT; if dPi is not less than dP or dPiT is not less than dPT, the energy management system of the microgrid system issues a power scheduling command to the equipment.
6. The anti-reflux control method for the microgrid system as claimed in claim 1, characterized in that: the anti-reflux threshold value P11=0.0kW, and the anti-reflux threshold value P12=1.0kW.
7. The anti-reflux control method for the micro-grid system according to claim 1, wherein: the micro-grid system enables Ps to be more than or equal to 0.0, ps to be not less than P01 × a and a to be more than 1.0 and less than 2.0 by executing emergency counter-flow prevention measures or general counter-flow prevention measures; wherein Ps is the weighted value of the power of the gateway table.
8. The anti-reflux control method for the microgrid system as claimed in claim 7, characterized in that: in step 2a, the countercurrent occurrence time T0= (P01-P11)/dP 01; if T0+ Tmax is larger than 0.0, judging that the current state of the micro-grid system is an emergency countercurrent state and implementing emergency countercurrent prevention measures; if T0+ Tmax is less than or equal to 0.0, judging that the current state of the micro-grid system is a general anti-reflux state and implementing general anti-reflux measures;
and the Tmax is the response time of the device with the longest response time in the distributed power supply device and the energy storage device of the microgrid system.
9. The anti-reflux control method for the microgrid system as claimed in claim 8, characterized in that: the emergency counter-current prevention measures comprise an energy storage equipment emergency counter-current prevention measure and a power supply equipment emergency counter-current prevention measure, and the priority of the energy storage equipment emergency counter-current prevention measure is higher than that of the power supply equipment emergency counter-current prevention measure;
the emergency anti-backflow measure of the energy storage device comprises the following operations: all energy storage devices are sorted from large to small according to real-time power, and the energy storage device closest to the top is an energy storage device i max According to energy storage device i max Response time T3i max And response time meansLabel T11 pair of energy storage devices i max Classifying if the response time T3i is max T11 is less than or equal to, then the energy storage device i max The type of the energy storage device is quick response energy storage device and power control is carried out on the energy storage device, if the response time is T3i max If T11 is greater, the energy storage device i max The type of the energy storage device is slow response energy storage device and the shutdown control is carried out on the energy storage device;
in the emergency anti-reflux measure of the energy storage equipment, the energy storage equipment i is subjected to max In power control, the energy storage device i max Is SOC of max If SOC is max Not less than 100.0 and energy storage device i max In the discharging state, the energy storage device i is lowered max Discharge power P3i max (ii) a If SOC max If < 100.0, the energy storage device i is increased max The charging power of (a);
in the emergency anti-reflux measure of the energy storage equipment, the energy storage equipment i is subjected to max When performing power control, if SOC max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time return difference value dP3T is obtained, the energy management system of the micro-grid system sends the energy storage device i max Issuing power scheduling command and increasing energy storage equipment i max The charging power of (a);
the emergency anti-reverse flow measure of the power supply equipment comprises the following operations: all distributed power supply equipment is sorted from large to small according to real-time power, and the distributed power supply equipment which is the most front sorted is power supply equipment i max According to the power supply device i max Response time T2i max And response time index T11 to power supply device i max Classifying if the response time T2i is max The response time index T11 is less than or equal to, the power supply equipment i max Is a fast response power supply device and performs power control on the fast response power supply device if the response time is T2i max > response time index T11, the power supply device i max Is slow response power supply equipment and carries out shutdown control on the slow response power supply equipment;
in the emergency anti-reflux measure of the power supply equipment, the power supply equipment i is subjected to max When power control is performed, if the power supply device i max Real-time power P2i max < Power supply device i max Rated power P2Ei max Then to the power supply device i max Transmitting a power setting command to make the power supply device i max Reducing the power generation power; if the real-time power P2i max Not less than rated power P2Ei max Then to the power supply device i max Performing shutdown control;
in the emergency anti-reflux measure of the power supply equipment, the power supply equipment i is subjected to max When performing power control, if the real-time power P2i max < rated Power P2Ei max And a power supply device i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply device i max A power setting time interval dP2iT of two times before and after max Power supply apparatus i max The time return difference value dP2T is obtained, and the energy management system of the micro-grid system sends power equipment i to the power equipment max Issuing power scheduling command to enable power supply equipment i max Reducing the power generation power;
the general anti-reflux measures comprise general anti-reflux measures of energy storage equipment and general anti-reflux measures of power supply equipment, and the priority of the general anti-reflux measures of the energy storage equipment is higher than that of the general anti-reflux measures of the power supply equipment;
the general anti-reflux measures of the energy storage device comprise the following operations: the energy storage devices of the micro-grid system are sorted from large to small according to real-time power, and the energy storage device closest to the top of the sorting is the energy storage device i max Energy storage device i max Is SOC of max If SOC is max If the current value is less than 100.0, the energy management system of the micro-grid system supplies energy to the energy storage device i max Sending a power setting command to enable the energy storage device i max Increasing the charging power; if SOC max If the current value is more than or equal to 100.0, the energy management system sends the energy storage device i max Sending a power setting command to enable the energy storage device i max Reducing the discharge power to 0;
in the general anti-reflux measure of the energy storage device, if SOC max < 100.0, and an energy storage device i max The power difference dP3i of the two adjacent power settings max Not less than energy storage equipment i max Is set back to the difference value dP3 or the energy storage device i max A power setting time interval dP3iT of two times before and after max Not less than energy storage equipment i max The time return difference value dP3T, the energy management system sends the energy storage device i max Issuing power scheduling command to enable energy storage equipment i max Increasing the charging power;
the general anti-reflux measures of the power supply apparatus include the following operations: the distributed power supply equipment of the micro-grid system is sorted from large to small according to real-time power, and the distributed power supply equipment with the top sorting is power supply equipment i max Energy management system to power supply device i max Transmitting a power setting command to make the power supply device i max Reducing the power generation power;
in the general anti-reverse-flow measure of the power supply equipment, if the power supply equipment i max The power difference dP2i of the two adjacent power settings max Power supply apparatus i max Is set back to the difference value dP2 or the power supply device i max A power setting time interval dP2iT of two times before and after max Power supply apparatus i max The time difference dP2T, the energy management system sends the power supply device i max Issuing power scheduling command to enable power supply equipment i max The generated power is reduced.
10. A microgrid system characterized in that it applies the anti-reflux control method according to any one of claims 1 to 9; the micro-grid system comprises an energy management system, an auxiliary control system, a distributed power system and an energy storage system; the distributed power supply system comprises distributed power supply equipment and an inverter which are matched for use, and is connected to the microgrid system through a switch K2; the energy storage system comprises a transformer T1, and an energy storage battery and a PCS which are used in a matched mode, wherein each PCS is connected with one side of the transformer T1, and the other side of the transformer T1 is connected into the microgrid system through a switch K1; the micro-grid system is connected with a public power supply through a switch K0 and is connected with a load through a switch K3; the auxiliary control system comprises electric meters KMH1, KMH2 and KMH3 which are respectively in communication connection with the energy management system, wherein the electric meters KMH2 are arranged between the switch K1 and the transformer T1, the electric meters KMH1 are arranged between the switch K0 and the distributed power system and the energy storage system, and the electric meters KMH3 are arranged between the switch K0 and the switch K2.
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