CN113381428A - Off-grid system sub-array EMS system and control method thereof - Google Patents
Off-grid system sub-array EMS system and control method thereof Download PDFInfo
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- CN113381428A CN113381428A CN202010157909.3A CN202010157909A CN113381428A CN 113381428 A CN113381428 A CN 113381428A CN 202010157909 A CN202010157909 A CN 202010157909A CN 113381428 A CN113381428 A CN 113381428A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention aims to disclose an off-network system subarray EMS system and a control method thereof, wherein the off-network system subarray EMS system comprises three layers of structures, the first layer is a subarray EMS unit which automatically adjusts the subarray photovoltaic output and the charging and discharging of an energy storage system according to the change of load; the second layer is a converter EMU unit which receives the instruction issued by the sub-square matrix EMS unit and completes the instruction distribution and issue to the energy storage converter PCS; the third layer is an energy storage converter PCS which receives an instruction issued by a converter EMU unit to complete charging and discharging control of the energy storage battery system; the group string type inverter directly receives an instruction issued by the sub-matrix EMS unit to complete the power control of the photovoltaic; the off-grid (microgrid) system is adopted for power supply, so that the method is quite rare at present, has certain innovativeness, lays a solid practical foundation for a larger-scale off-grid (microgrid) system, reduces burden for a power grid, and improves reliability of a power supply for a 330kV collection station by using an energy storage system as a permanent standby power supply for the 330kV collection station after the construction power supply function is finished.
Description
Technical Field
The present invention relates to a subarray EMS system and a control method thereof, and more particularly, to an off-grid system subarray EMS system and a control method thereof.
Background
The external power supply is adopted for power supply in the traditional construction stage, the off-grid (micro-grid) system is adopted for power supply, the innovation is certain, and a solid practical foundation can be laid for the larger-scale off-grid (micro-grid) system.
Therefore, there is a need for an off-grid subsystem EMS system and a control method thereof to solve the above existing problems.
Disclosure of Invention
Aiming at the defects of the prior art, the off-network system subarray EMS system automatically adjusts subarray photovoltaic output and energy storage system charging and discharging according to load changes, has a black start function, can realize the coordinated control operation of a plurality of PCS (Power System controller) and the SOC balance function of each set of batteries, and supports the combined operation function of a plurality of sets of energy storage systems in an off-network state.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the invention provides an off-grid system subarray EMS system and a control method thereof, which is characterized in that the system consists of three layers of structures, wherein the first layer is a subarray EMS unit which automatically adjusts the subarray photovoltaic output and the charging and discharging of an energy storage system according to the change of load; the second layer is a converter EMU unit which receives the instruction issued by the sub-square matrix EMS unit and completes the instruction distribution and issue to the energy storage converter PCS; the third layer is an energy storage converter PCS which receives an instruction issued by a converter EMU unit to complete charging and discharging control of the energy storage battery system; and the group string type inverter directly receives the instruction sent by the sub-square-matrix EMS unit to complete the power control of the photovoltaic.
In one embodiment of the invention, the string inverter is communicatively connected to a PLC power carrier module in a data acquisition device of the sub-array EMS unit.
In one embodiment of the invention, all loads of 0.8kV, 0.4kV and 35kV buses need to be disconnected before off-grid starting, the energy storage converter PCS is started only with a transformer, and the load is put into use after the starting is finished.
In a second aspect, the present invention provides a method for controlling an off-grid system submatrix EMS system, which is characterized in that the method comprises the following steps:
(1) the method comprises the following steps that a sub-square array EMS unit checks that a battery, an energy storage converter PCS and the like have no faults, simultaneously starts a plurality of energy storage converters PCS to enter an off-grid operation state, and starts a photovoltaic to enter a grid-connected operation state;
(2) the method comprises the following steps that a sub-square array EMS unit detects the charge-discharge state of a PCS of an energy storage converter in real time;
(3) in the whole off-grid operation process, the sub-square array EMS unit detects the SOC state of each energy storage unit in real time, dynamically adjusts the operation power of each energy storage converter PCS through controlling the energy storage converter PCS secondary frequency modulation value according to an SOC balance algorithm, and maintains the battery balance.
In an embodiment of the invention, if the energy storage converter PCS is in a discharging state, which indicates that the load power is greater than the photovoltaic power, the sub-square array EMS unit controls the photovoltaic not to be limited.
In one embodiment of the invention, if the battery SOC reaches the discharging threshold value under the discharging condition of the energy storage converter PCS, the sub-square array EMS unit controls the diesel engine to start to charge the battery until the battery SOC is recovered to the set SOC threshold value, and controls the diesel engine to stop.
In an embodiment of the invention, if the energy storage converter PCS is in a charging state, the load power is smaller than the photovoltaic power, the energy storage system is charged, and if the battery is fully charged, the sub-square array EMS unit dynamically controls the photovoltaic power limiting, so that the photovoltaic power is equal to the load power, and the energy storage system is not charged.
In one embodiment of the invention, if the energy storage converter PCS is in a charging condition and the charging power of the energy storage converter PCS is greater than the set charging power, the sub-square array EMS unit dynamically controls the photovoltaic power limitation to meet the condition that the charging power of the energy storage converter PCS is less than the set charging power.
In one embodiment of the invention, if the energy storage converter PCS is in a charging condition and the charging power of the energy storage converter PCS is smaller than the set charging power, the sub-square array EMS unit controls the photovoltaic not to be limited.
In one embodiment of the invention, when 0.8kV and 0.4kV buses have faults, the energy storage converter PCS is automatically protected, and a relay protection device is configured on the 35kV bus.
Compared with the prior art, the off-grid system submatrix EMS system and the control method thereof have the advantages that the off-grid (microgrid) system power supply is adopted, the innovation is certain, a solid practical foundation is laid for the larger-scale off-grid (microgrid) system, the burden of a power grid is reduced, after the construction power supply function is finished, the energy storage system is used as a permanent standby power supply of a 330kV collection station, the reliability of the power supply for the 330kV collection station is improved, and the purpose of the invention is realized.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic structural diagram of an off-grid subsystem EMS system according to the present invention;
FIG. 2 is a flow chart illustrating a method for controlling an off-grid EMS subsystem;
FIG. 3 is a schematic flow chart of black start of the off-grid (microgrid) system according to the present invention;
fig. 4 is a schematic flow chart of the daily operation of the off-grid (microgrid) system of the present invention;
fig. 5 is a schematic flow chart of the off-grid (microgrid) system SOC equalization control logic according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Examples
As shown in fig. 1, the off-grid system subarray EMS system of the present invention comprises three layers of structures, wherein the first layer is a subarray EMS unit, which automatically adjusts the subarray photovoltaic output and the charging and discharging of the energy storage system according to the change of the load; the second layer is a converter EMU unit which receives the instruction issued by the sub-square matrix EMS unit and completes the instruction distribution and issue to the energy storage converter PCS; the third layer is an energy storage converter PCS which receives an instruction issued by a converter EMU unit to complete charging and discharging control of the energy storage battery system; and the group string type inverter directly receives the instruction sent by the sub-square-matrix EMS unit to complete the power control of the photovoltaic.
In the present embodiment, the string inverter is communicatively connected to the PLC power carrier module in the data acquisition device of the sub-array EMS unit.
In this embodiment, before the off-grid start, all loads of 0.8kV, 0.4kV and 35kV buses need to be disconnected, the energy storage converter PCS is started only with the transformer, and the load is put into use after the start is completed.
The adopted sub-square array communication control equipment mainly comprises a Logger3000 data collector, an EMS200 type EMS controller, an optical fiber switch, an optical fiber terminal box, a notebook computer and other equipment. The sub-matrix communication control equipment can also be composed of SACU2000B-D-PLC-PID intelligent sub-matrix controller, switch, optical fiber distribution box and other equipment. The sub-square matrix communication control equipment can also comprise an SAU data acquisition unit, a switch, an optical fiber terminal box and other equipment.
As shown in fig. 2, the method for controlling an off-grid EMS system includes the following steps:
it comprises the following steps:
(1) the method comprises the following steps that a sub-square array EMS unit checks that a battery, an energy storage converter PCS and the like have no faults, simultaneously starts a plurality of energy storage converters PCS to enter an off-grid operation state, and starts a photovoltaic to enter a grid-connected operation state;
(2) the method comprises the following steps that a sub-square array EMS unit detects the charge-discharge state of a PCS of an energy storage converter in real time;
(3) in the whole off-grid operation process, the sub-square array EMS unit detects the SOC state of each energy storage unit in real time, dynamically adjusts the operation power of each energy storage converter PCS through controlling the energy storage converter PCS secondary frequency modulation value according to an SOC balance algorithm, and maintains the battery balance.
In this embodiment, if the energy storage converter PCS is in a discharging state, which indicates that the load power is greater than the photovoltaic power, the sub-square array EMS unit controls the photovoltaic not to be limited.
If the battery SOC reaches the discharging threshold value under the discharging condition of the energy storage converter PCS, the sub-square array EMS unit controls the diesel engine to start to charge the battery until the battery SOC is recovered to the set SOC threshold value, and controls the diesel engine to stop.
In this embodiment, if the energy storage converter PCS is in a charging state, it indicates that the load power is less than the photovoltaic power, the energy storage system is charged, and if the battery is fully charged, the subarray EMS unit dynamically controls the photovoltaic power limiting, so that the photovoltaic power is equal to the load power, and the energy storage system is not charged.
If the energy storage converter PCS is in a charging condition, and the charging power of the energy storage converter PCS is larger than the set charging power, the sub-square array EMS unit dynamically controls the photovoltaic power limiting, and the condition that the charging power of the energy storage converter PCS is smaller than the set charging power is met.
And if the energy storage converter PCS is in the charging condition and the charging power of the energy storage converter PCS is smaller than the set charging power, the sub-square array EMS unit controls the photovoltaic not to be limited.
In this embodiment, when a 0.8kV and 0.4kV bus fails, the energy storage converter PCS automatically protects, and the 35kV bus is provided with a relay protection device.
The control method of the off-network system sub-array EMS system can be realized by the following modes:
the voltage frequency control strategy under the normal condition is as follows: the frequency and voltage control of the system is completed by a power supply source (VSG) VF energy storage, the system is disturbed, and the VF energy storage is subjected to frequency modulation according to the primary droop characteristic of the VF energy storage. The VF energy storage can participate in secondary frequency modulation and voltage regulation, and when the secondary frequency modulation is put into use, the coordination controller regulates the active power working point of the energy storage, so that the system frequency is always kept near the rated frequency. And the coordination controller adjusts the reactive power working point of energy storage by the input of secondary voltage regulation, so that the system voltage is always kept near the voltage of the finasteride.
Voltage and frequency control strategy in emergency: after fault isolation is carried out on partial regions of the system, voltage and frequency change is large, energy storage capacity cannot meet the requirements of frequency modulation and pressure regulation, s-level voltage regulation and frequency modulation of the microgrid system are achieved through rapid load shedding and load shedding, and two strategies of active voltage and frequency control and passive voltage and frequency control are configured.
a. Active voltage, frequency control: and detecting the state of the whole network, and actively adjusting the output of the micro power supply to maintain the dynamic balance of the system power and keep the voltage and the frequency of the system stable when detecting or planning that the micro power grid generates large disturbance such as power supply input/exit.
b. Passive voltage, frequency control: if the voltage and the frequency are seriously deviated from the rated values, emergency control measures are required, including low-frequency low-voltage load reduction, over-frequency overvoltage tripping and the like.
Controlling photovoltaic power generation: the photovoltaic power generation is divided into an MPPT control mode and a limited power control mode, and the MPPT is used under the normal condition for improving the utilization rate of solar energy; under the emergency condition, the control is in limited power control, and the influence on the system stability caused by photovoltaic output fluctuation is avoided. According to the power balance principle, the off-grid micro-grid needs to limit photovoltaic output in real time and automatically limits photovoltaic power to the allowable value of the energy storage chargeable maximum power.
SOC balancing: and configuring a coordination control device to realize SOC balance, wherein the coordination control device acquires the SOC states of the battery packs and proportionally distributes the SOC states of the battery packs to the battery packs according to the SOC of the battery packs for each charging and discharging power. During charging, the battery pack with small SOC is charged preferentially, and the charging power is high; during discharge, the battery pack having a large SOC is discharged with priority, and the discharge power is large.
And fifthly, starting the system in black: and the local load and the micro power supply in the micro power grid are disconnected, and the power supply is ensured to be started in an idle state.
a. The load end is turned off by the black start of the diesel engine, the diesel engine supports zero start to boost, and the isolation transformer can be switched on at the same time.
b. And closing all circuit breakers except the load, boosting the energy storage to zero, putting the load after the voltage is stable, and automatically connecting the photovoltaic grid.
Automatically starting and stopping the firewood: the coordination control means controls automatic start and stop of the over-shoot according to the current SOC state and the charge and discharge power of the stored energy, automatically starts the firewood to supplement the load power when the light storage cannot meet the load demand and the SOC of the person is low, and automatically stops the firewood when the SOC of the stored energy is higher.
The black-start block diagram and the daily operation block diagram of the off-grid (microgrid) system in the mode are shown in fig. 3 and 4.
The control method of the off-network system sub-array EMS system can be realized by the following modes:
establishing micro-grid
a. Micro-grid black start
i microgrid mode commissioning
And manually disconnecting the PCS, INV and the load switch. (35 kv and 0.4kv load main switch configuration voltage loss release is recommended)
The firewood machine is started manually.
And two PCS grid-connected switches and the two PCS air conditioners, BMS power supplies, PCS liquid crystal or background current source setting modes are combined to start the PCS, and the charging power of each PCS is set to be 100 kw.
Wait for 70% or two hours for the two PCS cells to charge.
The PCS door plate knob is operated to be OFF, PCS is turned OFF, PCS liquid crystal is set to be in a voltage source mode, and the PCS panel starts the knob to be in an ON state.
The firewood is turned off, and the firewood switch is turned off.
The photovoltaic switch is manually closed.
When the micro-grid mode switch knob is operated to be in an ON state, the EMS takes over the system, and when the EMS detects that the diesel engine is switched off and the SOC of at least more than two PCS is more than 35 percent (can be set), the BMS of the system allows discharging, and the PCS has no fault which does not allow the start-up, the micro-grid mode ready indicator lamp is lightened.
ii microgrid power supply start-up
After the microgrid mode ready indicator lamp is turned ON, a microgrid power supply knob ON an EMS operation panel is manually operated to be in an ON state, and the EMS defaults to start the two PCS.
After the PCS works normally, the power supply indicating lamp is lightened.
And the EMS dispatches the total power of the photovoltaic inverter according to the power value calculated by the formula, and commands to start the photovoltaic inverter.
b. Micro-grid hot start operating condition
All PCS panels are turned to an ON state.
When the micro-grid mode switch knob is operated to be in an ON state, the EMS takes over the system, and when the SOC of at least two PCS is detected to be more than 35 percent (optional), the BMS of the system allows discharging, and the PCS has no fault which does not allow starting, the micro-grid mode ready indicator lamp is lightened.
After the microgrid mode ready indicator lamp is turned ON, a microgrid power supply knob ON an EMS operation panel is manually operated to be in an ON state, and the EMS starts a PCS allowing work. (Voltage Source)
After the PCS normally works, the power supply indicating lamp is lightened, and the starting state of the total microgrid is processed. And the EMS dispatches the total power of the photovoltaic inverter according to the power value calculated by the formula, and commands to start the photovoltaic inverter.
② micro-grid shutdown
a. And manually turning OFF the micro-grid power supply start-stop knob of the manual EMS panel to OFF. The EMS issues an instruction to shut down the inverter first and then shut down the PCS.
b. Automatic closing
The iEMS detects that the SOC of any ESS (PCS + BAT) in the discharge state is lower than 30% (optional) and lasts for more than 5 minutes, and the PCS is shut down.
The method comprises the following steps: the EMU uploads the discharge state, and the BMS uploads the SOC to the EMS.
ii, when the PCS body is in a discharge state, the SOC of BAT is detected to be lower than 20% (optional) or the battery voltage is low and lasts for more than 5 minutes, and the PCS executes self-shutdown. The EMU can transmit SOC and battery voltage low information of the BMS to the PCS. The EMU can also process logic and close PCS according to SOC and battery voltage low information sent by the BMS.
③ micro-grid self-recovery
a. Recovery conditions of all PCS self-shutdown (self-recovery of whole microgrid)
EMS increases the power down save setting amount: whether the microgrid is allowed to self-restore power supply.
The working condition is as follows: (Huapeng low-voltage UPS support power supply for more than 5 hours)
The EMS detects the recovery of inverter communication for more than xxx minutes (default 30 minutes), and starts all PCS in the VF mode to build up voltage. Then the inverter is started again, and the power of the inverter is controlled.
b. Recovery condition of single PCS self-shutdown
And when the EMS judges that the PCS in online operation is in a charging state, starting the single PCS in a voltage source mode.
Operation of the microgrid
The control scheme is provided for solving the problems that a single PCS (Power System controller) is added into or withdrawn from a microgrid, a single inverter is added into or withdrawn from the microgrid, the whole photovoltaic system is added into or withdrawn from the microgrid, the microgrid system is loaded in a steady state, the microgrid system is loaded in a dynamic state, loads are loaded in a sudden mode and unloaded in a sudden mode, and the SOC of each energy storage system in the microgrid is balanced.
SOC balance: and SOC balance control (at least two PCS can work), and the EMS controls the SOC balance of the batteries of the converters.
a. And after all the PCS are put into operation in the VF mode, after 30S delay judgment, if the difference between the lowest SOC and the highest SOC is more than 10 percent and the VF mode is in a charging state, the PCS with the highest SOC is shut down and changed into a PQ mode, and then the PCS is started to discharge. When the error is within 5%, switching back to VF mode, and searching the next PCS with the error exceeding 10%.
b. And when all PCS are put into operation in the VF mode, after 30S delay judgment, if the difference between the highest SOC and the lowest SOC is more than 10 percent, and if the VF mode is in a discharging state, the PCS with the lowest SOC is shut down, changed into the PQ mode, and then started to charge. When the error is within 5%, switching back to VF mode, and searching the next PCS with the error exceeding 10%.
c. In a and b, if the charge-discharge state changes and the state is continuously kept for more than 30S, the previous working state is exited, and the SOC balancing strategy under the current condition is executed.
The SOC equalization control logic diagram of the off-grid (microgrid) system in this way is shown in fig. 5.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. An off-grid system subarray EMS system is characterized by comprising three layers of structures, wherein the first layer is a subarray EMS unit which automatically adjusts the subarray photovoltaic output and the charging and discharging of an energy storage system according to the change of load; the second layer is a converter EMU unit which receives the instruction issued by the sub-square matrix EMS unit and completes the instruction distribution and issue to the energy storage converter PCS; the third layer is an energy storage converter PCS which receives an instruction issued by a converter EMU unit to complete charging and discharging control of the energy storage battery system; and the group string type inverter directly receives the instruction sent by the sub-square-matrix EMS unit to complete the power control of the photovoltaic.
2. The off-grid-system subarray EMS system of claim 1, wherein the string inverter is communicatively coupled to a PLC power carrier module in a data acquisition device of the subarray EMS unit.
3. The off-grid subsystem subarray EMS system of claim 1, wherein before off-grid startup, all loads of 0.8kV, 0.4kV and 35kV buses need to be disconnected, the energy storage converter PCS only starts with a transformer, and after the startup is completed, the load is put into use.
4. A control method of an off-grid system subarray EMS system is characterized by comprising the following steps:
(1) the method comprises the following steps that a sub-square array EMS unit checks that a battery, an energy storage converter PCS and the like have no faults, simultaneously starts a plurality of energy storage converters PCS to enter an off-grid operation state, and starts a photovoltaic to enter a grid-connected operation state;
(2) the method comprises the following steps that a sub-square array EMS unit detects the charge-discharge state of a PCS of an energy storage converter in real time;
(3) in the whole off-grid operation process, the sub-square array EMS unit detects the SOC state of each energy storage unit in real time, dynamically adjusts the operation power of each energy storage converter PCS through controlling the energy storage converter PCS secondary frequency modulation value according to an SOC balance algorithm, and maintains the battery balance.
5. The method as claimed in claim 4, wherein if the energy storage converter PCS is in a discharging state, it indicates that the load power is greater than the photovoltaic power, and the subarray EMS unit controls the photovoltaic not to be limited.
6. The method as claimed in claim 4, wherein if the battery SOC reaches the discharging threshold value under the discharging condition of the energy storage converter PCS, the sub-array EMS unit controls the diesel engine to start to charge the battery until the battery SOC recovers to the set SOC threshold value, and controls the diesel engine to stop.
7. The method as claimed in claim 4, wherein if the energy storage converter PCS is in a charging state, it indicates that the load power is less than the photovoltaic power, the energy storage system is charged, if the battery is fully charged, the subarray EMS unit dynamically controls the photovoltaic power limitation, the photovoltaic power is equal to the load power, and the energy storage system is not charged.
8. The method as claimed in claim 4, wherein if the energy storage converter PCS is in charging condition and the energy storage converter PCS charging power is greater than the set charging power, the subarray EMS unit dynamically controls the photovoltaic power limitation to satisfy the condition that the energy storage converter PCS charging power is less than the set charging power.
9. The method as claimed in claim 4, wherein if the energy storage converter PCS is in charging condition and the energy storage converter PCS charging power is less than the set charging power, the sub-square EMS unit controls the photovoltaic not to be limited.
10. The method for controlling the off-grid system subarray EMS system according to claim 4, wherein when 0.8kV and 0.4kV buses fail, the energy storage converter PCS is automatically protected, and a relay protection device is configured on the 35kV bus.
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| CN202010157909.3A CN113381428A (en) | 2020-03-09 | 2020-03-09 | Off-grid system sub-array EMS system and control method thereof |
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| CN202010157909.3A CN113381428A (en) | 2020-03-09 | 2020-03-09 | Off-grid system sub-array EMS system and control method thereof |
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