CN109713659A - A kind of direct-current grid and its coordinated operation method - Google Patents
A kind of direct-current grid and its coordinated operation method Download PDFInfo
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Abstract
The present invention relates to a kind of direct-current grid and its coordinated operation methods, belong to DC distribution network technology field, including DC energy storage system, new energy DC power generation system, bidirectional, dc charger and controller, controller is used to control the coordinated operation of direct-current grid, direct-current grid is during isolated power grid, when the generated energy of new energy DC power generation system is unable to satisfy load electricity consumption, DC energy storage system is put into, controls DC energy storage system as discharge power supply；When the battery dump energy of DC energy storage system is lower than preset lower limit, and the maximum output that DC energy storage system be in discharge condition and new energy DC power generation system is less than supply load, investment bidirectional, dc charger and as discharge power supply.Direct-current grid of the invention can be realized the coordinated operation between DC energy storage system, new energy DC power generation system and bidirectional, dc charger in isolated power grid, and power supply switching control is reliable, can guarantee the stabilization uninterrupted power supply of load.
Description
Technical field
The invention belongs to DC distribution network technology fields, and in particular to a kind of direct-current grid and its coordinated operation method.
Background technique
In recent years, increasingly prominent with energy demand and environmental problem, the distributed power generation based on clean energy resource obtains
Extensive attention is arrived, therefore micro-capacitance sensor also generates.Micro-capacitance sensor is mostly based on exchange, but the system structure of direct-current grid is simple,
Energy conversion is small, and power supply quality is high, advantageously compared to exchange micro-capacitance sensor.With the development of distribution system, direct-current grid is got over
To be more valued by people.Due to the intermittence and randomness of renewable energy output power, DC energy storage system at
There is important research significance for the important link of direct-current grid.
Direct-current grid is at home and abroad in demonstrating running stage, not yet large-scale promotion at present, and put into operation demonstration project
The light storage for being all based on DC bus is filled structure (i.e. photovoltaic DC electricity generation system, DC energy storage system, charging pile), capacity is small,
After main electric network fault, the control strategy that direct-current grid carries out isolated power grid is simple, can not carry out reliable power supply switching control,
Cause the power supply reliability of direct-current grid poor.
Summary of the invention
The object of the present invention is to provide a kind of direct-current grid and its coordinated operation methods, for solving existing DC micro-electric
Net can not carry out reliable power supply switching control problem.
In order to solve the above technical problems, the present invention proposes a kind of coordinated operation method of direct-current grid, the coordinated operation
Method be suitable for include DC energy storage system, the direct-current grid of new energy DC power generation system and bidirectional, dc charger,
During the isolated power grid of direct-current grid, when the generated energy of new energy DC power generation system is unable to satisfy load electricity consumption,
DC energy storage system is put into, controls DC energy storage system as discharge power supply.
When DC energy storage system battery dump energy be lower than preset lower limit, DC energy storage system be in discharge condition and
When the maximum output of new energy DC power generation system is less than supply load, bidirectional, dc charger is put into, control bidirectional, dc fills
Motor controls DC energy storage system and no longer discharges as discharge power supply.
Direct-current grid of the invention is during isolated power grid, when the generated energy of new energy DC power generation system can not expire
When sufficient load electricity consumption, by preferentially putting into DC energy storage system, power to load, when DC energy storage system is in discharge condition
And the maximum output of new energy DC power generation system is less than supply load, when battery dump energy is lower than preset lower limit, then throws
Enter bidirectional, dc charger as discharge power supply to power to load, battery is protected on the basis of maximally utilizing new energy, is prevented
Only battery over-discharge guarantees powered stable, the reliability service of direct-current grid.The direct-current grid of the invention energy in isolated power grid
Enough realize the coordinated operation between DC energy storage system, new energy DC power generation system and bidirectional, dc charger, power supply switching control
System is reliable, can guarantee stabilization, the uninterrupted power supply of load.
For the further reliable uninterrupted power supply for guaranteeing load, when direct-current grid further includes Oil-fired Once generator,
The coordinated operation method further include: the Oil-fired Once generator in control direct-current grid is as discharge power supply, Oil-fired Once
The investment priority level of generator is less than DC energy storage system and bidirectional, dc charger.
Further include: when if direct-current grid receives grid-connected instruction during isolated power grid, obtain the outlet of discharge power supply
The grid entry point voltage of voltage and direct-current grid calculates the voltage difference between the grid entry point voltage and exit potential, when the electricity
Pressure difference within the set range when, control the direct-current grid and switch to be incorporated into the power networks by isolated power grid, is i.e. isolated power grid mode
Switch to the mode of being incorporated into the power networks, that realizes direct-current grid operational mode stablizes switching.
Further, it when DC energy storage system or bidirectional, dc charger are as discharge power supply, is controlled using following steps
The exit potential:
The voltage difference is obtained, adjusts to obtain current reference value by PI, obtains the output electric current of the discharge power supply,
The current differential of calculating current reference value and output electric current, the current differential adjust to obtain voltage reference value, voltage ginseng by PI
PWM modulation is carried out after examining the energy-storage battery voltage of the corresponding direct current energy-storage system of value superposition or bidirectional, dc charger, according to PWM tune
The signal that system generates drives the switching device of energy accumulation current converter in corresponding direct current energy-storage system or bidirectional, dc charger.
When DC energy storage system or bidirectional, dc charger are as discharge power supply, DC energy storage is adjusted by above step
The exit potential of system or bidirectional, dc charger, reaches voltage difference in setting range, realizes direct-current grid by isolated network
Run to the switching being incorporated into the power networks.
Further, Oil-fired Once generator is as during discharge power supply, when the battery dump energy of DC energy storage system
When power higher than setting upper limit value, and the absorption of DC energy storage system is less than the power that Oil-fired Once generator issues, control again
DC energy storage system processed realizes the effective use of clean energy resource as discharge power supply, avoids due to Oil-fired Once generator conduct
Discharge power supply causes the pollution to environment.
In order to solve the above technical problems, the present invention also proposes a kind of direct-current grid, including DC energy storage system, new energy
DC power generation system, bidirectional, dc charger and controller, the controller for controlling direct-current grid according to the following steps
Coordinated operation:
During the isolated power grid of direct-current grid, when the generated energy of new energy DC power generation system is unable to satisfy load
When electricity consumption, DC energy storage system is put into, controls DC energy storage system as discharge power supply；
When DC energy storage system battery dump energy be lower than preset lower limit, DC energy storage system be in discharge condition and
When the maximum output of new energy DC power generation system is less than supply load, bidirectional, dc charger is put into, control bidirectional, dc fills
Motor controls DC energy storage system and no longer discharges as discharge power supply.
Direct-current grid of the invention is during isolated power grid, when the generated energy of new energy DC power generation system can not expire
When sufficient load electricity consumption, DC energy storage system is preferentially put by the control of controller, is powered to load, when DC energy storage system
In discharge condition, the maximum output of new energy DC power generation system is less than supply load, and battery dump energy is lower than setting
When lower limit value, bidirectional, dc charger is put into as discharge power supply by the control of controller again, is powered to load.Of the invention
Direct-current grid can be realized DC energy storage system, new energy DC power generation system and bidirectional, dc charger in isolated power grid
Between coordinated operation, power supply switching control is reliable, can guarantee stabilization, the uninterrupted power supply of load.
For the further reliable uninterrupted power supply for guaranteeing load, when direct-current grid further includes Oil-fired Once generator,
Controller is also used to control the Oil-fired Once generator in direct-current grid as discharge power supply, the investment of Oil-fired Once generator
Priority level is less than DC energy storage system and bidirectional, dc charger.
To realize that stablizing for direct-current grid operational mode switches, if above-mentioned direct-current grid is received during isolated power grid
To when grid-connected instruction, controller is also used to obtain the exit potential of the discharge power supply and the grid entry point voltage of direct-current grid,
Calculate the voltage difference between the grid entry point voltage and exit potential, when the voltage difference within the set range when, described in control
Direct-current grid is switched to be incorporated into the power networks by isolated power grid.
When DC energy storage system or bidirectional, dc charger are as discharge power supply, the controller is also used to using following
Step controls the exit potential:
The voltage difference is obtained, adjusts to obtain current reference value by PI, obtains the output electric current of the discharge power supply,
The current differential of calculating current reference value and the output electric current, the current differential adjust to obtain voltage reference value by PI, institute
It states after voltage reference value is superimposed the energy-storage battery voltage of corresponding direct current energy-storage system or bidirectional, dc charger and carries out PWM modulation,
The derailing switch of energy accumulation current converter in corresponding direct current energy-storage system or bidirectional, dc charger is driven according to the signal that PWM modulation generates
Part.
Controller adjusts the exit potential of DC energy storage system or bidirectional, dc charger by above step, makes voltage difference
Value reaches in setting range, realizes that direct-current grid stablizes switching to what is be incorporated into the power networks by isolated power grid.
The controller is also used in the Oil-fired Once generator as during discharge power supply, when DC energy storage system
Battery dump energy is higher than setting upper limit value, and the power that DC energy storage system absorbs is less than the function that Oil-fired Once generator issues
When rate, DC energy storage system is controlled again as discharge power supply, the effective use of clean energy resource is realized, avoids due to Oil-fired Once
Generator causes the pollution to environment as discharge power supply.
Detailed description of the invention
Fig. 1 is a kind of direct-current grid structural schematic diagram of the invention；
Fig. 2 is the control block diagram of the exit potential of DC energy storage system of the invention；
Fig. 3 is the circuit block diagram of the exit potential of DC energy storage system of the invention；
Fig. 4 is the work flow diagram that discharge power supply of the invention is switched to Oil-fired Once generator by DC energy storage system；
Fig. 5 is the work flow diagram that discharge power supply of the invention is switched to DC energy storage system by Oil-fired Once generator；
Fig. 6 is the control flow chart that DC energy storage system of the invention carries out operational mode switching as discharge power supply.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
Micro-capacitance sensor embodiment:
Direct-current grid as shown in Figure 1, including DC energy storage system, new energy DC power generation system, electric vehicle
Bidirectional, dc charger, Oil-fired Once generator and controller (also known as EMS, Energy Management System).DC energy storage system includes
Battery pack and energy accumulation current converter, battery pack is for connecting energy accumulation current converter, and energy accumulation current converter is for connecting DC bus (corresponding diagram
DC ± 750V bus in 1).New energy DC power generation system includes photovoltaic battery panel, DC/DC and blower, and photovoltaic battery panel is used
In connection DC/DC, DC/DC for connecting DC bus, blower is for connecting DC bus.Bidirectional, dc charger is for connecting
DC bus, and the primary structure of bidirectional, dc charger is identical as DC energy storage system, including battery pack and energy accumulation current converter,
It is battery pack charging by DC bus, energy accumulation current converter, each battery is used as electric vehicle in the battery pack of bidirectional, dc charger
DC power supply.Oil-fired Once generator is also used for connection DC bus.
Controller controls connection energy accumulation current converter, DC/DC, blower, bidirectional, dc charger, fuel oil by interchanger respectively
Dc generator and load, for controlling the coordinated operation of direct-current grid.
In Fig. 1, coordinated control unit is for controlling PCC switch, and when PCC, which is switched, to be disconnected, direct-current grid is in isolated network
Operational mode, direct-current grid is during isolated power grid, when the generated energy of new energy DC power generation system is unable to satisfy load
When electricity consumption, need to put into discharge power supply, discharge power supply is in DC energy storage system, bidirectional, dc charger, Oil-fired Once power generation
It is selected among machine, the present invention preferably puts into DC energy storage system, controls DC energy storage system as discharge power supply.
When DC energy storage system battery dump energy be lower than preset lower limit, DC energy storage system be in discharge condition and
When the maximum output of new energy DC power generation system is less than supply load, bidirectional, dc charger is put into, control bidirectional, dc fills
Motor controls direct current system and no longer discharges as discharge power supply, and DC energy storage system exits or in charge mode at this time.
It is straight for the further reliable uninterrupted power supply for guaranteeing load, the fuel oil that controller is also used to control in direct-current grid
Generator is flowed as discharge power supply, and the investment priority level of Oil-fired Once generator is less than DC energy storage system and bidirectional, dc fills
Motor.
When DC energy storage system is as discharge power supply, above controller is also used to control DC energy storage using following steps
The exit potential of system, as shown in Figure 2:
(1) the exit potential Ubus of DC energy storage system and the grid entry point voltage Ugrid of direct-current grid are obtained, calculating should
Voltage difference Δ U between grid entry point voltage Ugrid and exit potential Ubus.
(2) above-mentioned voltage difference Δ U adjusts to obtain current reference value Idc_ref by PI, obtains DC energy storage system
Electric current idc is exported, the current differential Δ I of calculating current reference value Idc_ref and output electric current idc, the current differential Δ I pass through
PI adjusts to obtain voltage reference value Udc_ref, and voltage reference value Udc_ref is superimposed the energy-storage battery voltage of DC energy storage system
PWM modulation is carried out after Udc, the switching device of energy accumulation current converter in the signal driving DC energy storage system generated according to PWM modulation,
To realize the adjusting of the exit potential Ubus of DC energy storage system.
Similar, when bidirectional, dc charger is as discharge power supply, bidirectional, dc charger is controlled using following steps
Exit potential:
The voltage difference between grid entry point voltage and the exit potential of bidirectional, dc charger is obtained, adjusts to obtain by PI
Current reference value obtains the output electric current of bidirectional, dc charger, and the current differential of calculating current reference value and output electric current should
Current differential adjusts to obtain voltage reference value by PI, after voltage reference value is superimposed the energy-storage battery voltage of bidirectional, dc charger
PWM modulation is carried out, the switching device of energy accumulation current converter in the switching signal driving bidirectional, dc charger generated according to PWM modulation
(S1、S2)。
The control of the exit potential of the instruction realization DC energy storage system of step (1), (2) is executed except through above controller
System is outer, as other embodiments, can also set control arithmetic element separately to realize, concrete implementation circuit is as shown in figure 3, control
Arithmetic element processed obtains the energy-storage battery voltage Udc and output electricity of DC energy storage system by sample circuit, signal conditioning circuit
Idc is flowed, grid entry point voltage Ugrid is obtained by controller and be sent to control arithmetic element, and control arithmetic element is according to the above step
Suddenly (1), (2) calculate voltage reference value Udc_ref and energy-storage battery voltage Udc superposition value, carried out by pulse generation unit
PWM modulation generates pulse and by the switching device of driving circuit driving energy accumulation current converter.
In addition, control arithmetic element can also be led to background monitoring system, human-machine interface unit, battery management system respectively
Letter facilitates the real time monitoring of background monitoring system, realizes human-computer interaction, and obtain battery correlation letter from battery management system
Breath, such as battery temperature information.
It is preferred priority level that the priority level of the present embodiment setting discharge power supply, which is followed successively by the priority level, as it
His embodiment can also be DC energy storage system, Oil-fired Once generator, bidirectional, dc charger, alternatively, Oil-fired Once is sent out
Motor is identical with bidirectional, dc charger priority level, sends out for example, discharge power supply is switched to Oil-fired Once by DC energy storage system
The workflow of motor is as shown in figure 4, the battery dump energy SOC when DC energy storage system is lower than preset lower limit SOC_L, directly
Flow output power Ppcs > 0 (Ppcs > 0 indicates that DC energy storage system is in discharge condition) of energy-storage system, new energy DC generation
When the maximum output of system is less than supply load, EMS is outputed " start command ", is started Oil-fired Once generator, is worked as Oil-fired Once
The voltage difference of the output voltage of generator and DC bus-bar voltage within the set range when, energy accumulation current converter and Oil-fired Once are sent out
Motor carry out sharing control, avoid equipment in discharge power supply handoff procedure from overcurrent occur, when sharing control is effective, EMS according to
Content in serial number 1, serial number 2, serial number 3 in table 1 carries out power regulation, realizes that the flexible of discharge power supply puts into and exit, protects
Demonstrate,prove the uninterrupted power supply of microgrid.In table 1, the DC/DC of photovoltaic battery panel, the current transformer of blower, DC energy storage system, Oil-fired Once
Generator is participated in indicating when the energy exchange in DC bus for " 1 ", be indicated when noenergy exchanges with " 0 ", wherein photovoltaic electric
The DC/DC of pond plate indicates that the current transformer of blower is indicated with " fan converter " with " photovoltaic DC/DC ", the charging of DC energy storage system
It is indicated with " PCS charging ", DC energy storage system discharge is indicated with " PCS electric discharge ".When DC energy storage system is as discharge power supply,
EMS carries out power regulation according to serial number 4, serial number 5, the content in serial number 6 in table 1.
Table 1
In the case where bulk power grid failure, direct-current grid operates in isolated power grid mode, after bulk power grid restores normal,
Direct-current grid is allowed to operate in the mode of being incorporated into the power networks, to realize that stablizing for direct-current grid operational mode switches, above-mentioned control
Device is also used to after the grid-connected instruction for receiving the transmission of coordinated control unit, obtains the exit potential and direct-current grid of discharge power supply
Grid entry point voltage, calculate the voltage difference between the grid entry point voltage and exit potential, when the voltage difference be less than setting value
When Δ U_lim, control direct-current grid is switched to be incorporated into the power networks by isolated power grid, realizes isolated power grid mode to the mode of being incorporated into the power networks
Switching.When the voltage difference of calculating is not less than setting value Δ U_lim, the exit potential of discharge power supply is adjusted, until meeting
After voltage difference is less than setting value Δ U_lim, being closed the switch by coordinated control unit control PCC, direct-current grid is incorporated into the power networks,
DC energy storage system is as shown in Figure 6 as the control flow that discharge power supply carries out operational mode switching.
The exit potential that DC energy storage system is adjusted by above step (1), (2), can make voltage difference be less than setting
It is worth Δ U_lim, to realize direct-current grid by isolated power grid to the switching being incorporated into the power networks.
Direct-current grid of the invention is during isolated power grid, when the generated energy of new energy DC power generation system can not expire
When sufficient load electricity consumption, DC energy storage system is preferentially put by the control of controller, is powered to load, when DC energy storage system
In discharge condition, when the maximum output of new energy DC power generation system is less than supply load, and battery dump energy is lower than setting
When lower limit value, the bidirectional, dc charger of electric vehicle is put into as discharge power supply, to load by the control of controller again
Power supply.Direct-current grid of the invention can be realized in isolated power grid DC energy storage system, new energy DC power generation system and
Coordinated operation between the bidirectional, dc charger of electric vehicle, power supply switching control is reliable, can guarantee load stabilization, not between
Cut-off electricity.
In addition, in Oil-fired Once generator as during discharge power supply, as the battery dump energy SOC of DC energy storage system
Higher than setting upper limit value SOC_H, and the power that DC energy storage system absorbs is less than the power of Oil-fired Once generator sending (i.e.
Ppcs+Pdg < 0) when, controller controls DC energy storage system as discharge power supply again.As shown in figure 5, Ppcs indicates direct current storage
The power that energy system absorbs, Pdg indicate that the power that Oil-fired Once generator absorbs, i.e., the power that Oil-fired Once generator issues take
Negative value.When Oil-fired Once generator power is less than conversion set value, DC energy storage system is controlled again as discharge power supply, and
Oil-fired Once generator outage is controlled, to reduce environmental pollution.
Operation method embodiment:
A kind of coordinated operation method of direct-current grid of the present embodiment, corresponding this method is above-mentioned micro-capacitance sensor embodiment
The coordinated operation method that middle controller is realized.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, the form of complete hardware embodiment or complete software embodiment can be used in the application, or combines software and hardware side
The form of the embodiment in face.Moreover, it wherein includes computer usable program code that the application, which can be used in one or more,
The computer implemented in computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of program product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (10)
1. a kind of coordinated operation method of direct-current grid, which is characterized in that the coordinated operation method is suitable for including that direct current stores up
Energy system, the direct-current grid of new energy DC power generation system and bidirectional, dc charger, in the isolated network of the direct-current grid
In operational process, when the generated energy of new energy DC power generation system is unable to satisfy load electricity consumption, the DC energy storage is put into
System controls DC energy storage system as discharge power supply；
When the battery dump energy of DC energy storage system is lower than preset lower limit, DC energy storage system is in discharge condition and new energy
When the maximum output of source DC power generation system is less than supply load, the bidirectional, dc charger is put into, control bidirectional, dc fills
Motor controls DC energy storage system and no longer discharges as discharge power supply.
2. the coordinated operation method of direct-current grid according to claim 1, which is characterized in that when direct-current grid is also wrapped
When including Oil-fired Once generator, the coordinated operation method further include: the Oil-fired Once generator in control direct-current grid is made
Investment priority level for discharge power supply, Oil-fired Once generator is less than the DC energy storage system and bidirectional, dc charger.
3. the coordinated operation method of direct-current grid according to claim 1 or 2, which is characterized in that further include: it is described straight
If stream micro-capacitance sensor receives grid-connected instruction during isolated power grid, the exit potential and DC micro-electric of the discharge power supply are obtained
The grid entry point voltage of net calculates the voltage difference between the grid entry point voltage and exit potential, when the voltage difference is in setting model
When enclosing interior, controls the direct-current grid and switch to be incorporated into the power networks by isolated power grid.
4. the coordinated operation method of direct-current grid according to claim 3, which is characterized in that when the DC energy storage system
When system or bidirectional, dc charger are as discharge power supply, the exit potential is controlled using following steps:
The voltage difference is obtained, adjusts to obtain current reference value by PI, obtains the output electric current of the discharge power supply, is calculated
The current differential of current reference value and the output electric current, the current differential adjust to obtain voltage reference value, the electricity by PI
Pressure reference value carries out PWM modulation after being superimposed the energy-storage battery voltage of corresponding direct current energy-storage system or bidirectional, dc charger, according to
The signal that PWM modulation generates drives the switching device of energy accumulation current converter in corresponding direct current energy-storage system or bidirectional, dc charger.
5. the coordinated operation method of direct-current grid according to claim 2, which is characterized in that the Oil-fired Once power generation
Machine sets upper limit value when the battery dump energy of DC energy storage system is higher than, and DC energy storage system as during discharge power supply
When the power of absorption is less than the power that Oil-fired Once generator issues, DC energy storage system is controlled again as discharge power supply.
6. a kind of direct-current grid, which is characterized in that including DC energy storage system, new energy DC power generation system, bidirectional, dc
Charger and controller, the controller for controlling the coordinated operation of direct-current grid according to the following steps:
During the isolated power grid of the direct-current grid, when the generated energy of new energy DC power generation system is unable to satisfy load
When electricity consumption, the DC energy storage system is put into, controls DC energy storage system as discharge power supply；
When the battery dump energy of DC energy storage system is lower than preset lower limit, DC energy storage system is in discharge condition and new energy
When the maximum output of source DC power generation system is less than supply load, the bidirectional, dc charger is put into, control bidirectional, dc fills
Motor controls DC energy storage system and no longer discharges as discharge power supply.
7. direct-current grid according to claim 6, which is characterized in that when direct-current grid further includes Oil-fired Once power generation
When machine, the controller is also used to control the Oil-fired Once generator in direct-current grid as discharge power supply, Oil-fired Once hair
The investment priority level of motor is less than the DC energy storage system and bidirectional, dc charger.
8. direct-current grid according to claim 6 or 7, which is characterized in that the direct-current grid is in isolated power grid mistake
When Cheng Zhongruo receives grid-connected instruction, the controller is also used to obtain the exit potential and direct-current grid of the discharge power supply
Grid entry point voltage calculates the voltage difference between the grid entry point voltage and exit potential, when the voltage difference within the set range
When, it controls the direct-current grid and switchs to be incorporated into the power networks by isolated power grid.
9. direct-current grid according to claim 8, which is characterized in that when the DC energy storage system or bidirectional, dc fill
When motor is as discharge power supply, the controller is also used to control the exit potential using following steps:
The voltage difference is obtained, adjusts to obtain current reference value by PI, obtains the output electric current of the discharge power supply, is calculated
The current differential of current reference value and the output electric current, the current differential adjust to obtain voltage reference value, the electricity by PI
Pressure reference value carries out PWM modulation after being superimposed the energy-storage battery voltage of corresponding direct current energy-storage system or bidirectional, dc charger, according to
The signal that PWM modulation generates drives the switching device of energy accumulation current converter in corresponding direct current energy-storage system or bidirectional, dc charger.
10. direct-current grid according to claim 7, which is characterized in that the controller is also used to straight in the fuel oil
Generator is flowed as during discharge power supply, sets upper limit value when the battery dump energy of DC energy storage system is higher than, and direct current stores up
When the power that energy system absorbs is less than the power that Oil-fired Once generator issues, DC energy storage system is controlled again and is used as electric discharge electricity
Source.
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| CN113300393A (en) * | 2021-05-18 | 2021-08-24 | 深圳供电局有限公司 | Direct-current microgrid battery energy storage energy management method, management equipment and storage medium |
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