CN110048394A - DC distribution net start and stop method, apparatus and equipment based on stelliform connection topology configuration - Google Patents
DC distribution net start and stop method, apparatus and equipment based on stelliform connection topology configuration Download PDFInfo
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- CN110048394A CN110048394A CN201910440394.5A CN201910440394A CN110048394A CN 110048394 A CN110048394 A CN 110048394A CN 201910440394 A CN201910440394 A CN 201910440394A CN 110048394 A CN110048394 A CN 110048394A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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Abstract
The DC distribution net start and stop method based on stelliform connection topology configuration that this application discloses a kind of, device and equipment, in the enabled instruction for receiving power grid, successively start the first Single port circuit, second Single port circuit, third Single port circuit and the 4th Single port circuit, when receiving normal halt instruction, power by adjusting all inverters drops to zero according to presetting slope, it is latched all inverters, disconnect the AC circuit breaker and dc circuit breaker at each end, realize the normal stoppage in transit to entire DC distribution net, when receiving emergent stopping instruction, by adjusting the direct zero setting of converter power, it is latched all inverters, disconnect the AC circuit breaker and dc circuit breaker at each end, realize the emergency outage to entire DC distribution net, improve the operation stability and reliability of the DC distribution net of stelliform connection topology configuration.
Description
Technical field
This application involves DC distribution network technology field more particularly to a kind of DC distribution nets based on stelliform connection topology configuration
Start and stop method, apparatus and equipment.
Background technique
Sensitive load, important load with the high speed development of city size increased rapidly with information technology, in power grid
And nonlinear-load is more and more, AC distribution net is faced with big line loss, power supply corridor anxiety and voltage transient and falls
Fall, voltage fluctuation, mains by harmonics, three-phase imbalance phenomenon aggravation etc. a series of power quality problems.And DC distribution net has
Various distributed generation resources, the two-way flow for neatly carrying out power and control can be smoothly accessed on the spot, improved power supply capacity, are changed
Therefore the series of advantages such as kind user side power quality, shielding system failure have DC distribution net systematic research important
Meaning and application prospect.
The topological structure of current DC distribution net mainly has both ends or multiterminal configuration, ring network structure and radial pattern structure,
And stelliform connection topology configuration belongs to radial pattern structure, is extensive and preferred one of network topology structure.Based on star topology knot
The DC distribution net of structure belongs to centralized control structure, have convenient for control and management, fault diagnosis and isolation be easy, network delay
The advantages that time is smaller, transmission error is lower.For different DC distribution net topology structures, operational mode is had any different,
It starts and stoppage in transit control strategy has differences.And the start-up and shut-down control plan of the DC distribution net for stelliform connection topology configuration
It omits, at present and does not enter further investigation, one kind disclosed in 2016 " Proceedings of the CSEEs " is matched suitable for flexible direct current
In the voltage control strategy of power grid, electricity only also is carried out to the DC distribution net of the topological structure of both ends, multiterminal and ring network structure
The analysis for pressing control strategy, there is no the DC distribution nets to stelliform connection topology configuration to carry out start and stop analysis of strategies, and for star-like
For the DC distribution net of topological structure, start-up and shut-down control has vital effect to the stabilization and safety of the system, therefore,
Carrying out start-up and shut-down control strategy study to the DC distribution net of stelliform connection topology configuration is those skilled in the art's technology urgently to be resolved
Problem.
Summary of the invention
This application provides a kind of DC distribution net start and stop method, apparatus and equipment based on stelliform connection topology configuration, are used for
Improve the operation stability and reliability of the DC distribution net of stelliform connection topology configuration.
In view of this, the application first aspect provides a kind of DC distribution net start and stop side based on stelliform connection topology configuration
Method, applied to what is be made of the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit
The DC distribution net system of stelliform connection topology configuration, comprising the following steps:
101, in the enabled instruction for receiving power grid, successively start the first Single port circuit, described second one end
Mouth circuit, the third Single port circuit and the 4th Single port circuit；
102A, when receiving normal halt instruction, by the first Single port circuit, the second Single port circuit,
The power of the third Single port circuit and all inverters in the 4th Single port circuit is reduced to zero by presetting slope,
All inverters are latched, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that the direct current is matched
Network system is normally stopped transport；
102B, receive emergent stopping instruction when, by the first Single port circuit, the second Single port circuit,
The power zero setting of the third Single port circuit and all inverters in the 4th Single port circuit is latched all described change
Device is flowed, and disconnects the AC circuit breaker and dc circuit breaker of each Single port circuit, so that the DC distribution net system emergency stops
Fortune.
Preferably, step 101 specifically includes:
1011, it configures the control model of the inverter of the first Single port circuit to determine Udc-Q control model, it is described
The control model of the inverter of second inverter of the second Single port circuit and the third Single port circuit is each configured to determine P-Q
The control model of control model, the commutator transformer of the 4th Single port circuit is configured to determine DC low-voltage control model；
1012, the first Single port circuit, the second Single port circuit and the third Single port circuit are closed
Charge circuit switch carries out uncontrollable rectification charging to DC network by AC system, complete in the uncontrollable rectification charging
Cheng Hou, control are configured to the first Single port circuit unlock starting for determining Udc-Q control model；
1013, it after the DC voltage of the first Single port circuit reaches preset reference value, successively unlocks and described determines P-Q
The the second Single port circuit and the third Single port circuit of control model are closed the first Single port circuit, described
The charge circuit switch bypass is promoted described the by the main switch of the second Single port circuit and the third Single port circuit
The active power of two Single port circuits and the third Single port circuit；
1014, when the active power of the second Single port circuit and the third Single port circuit reaches preset power value
Later, start the 4th Single port circuit, the direct current transformer low-pressure side DC voltage is promoted, so that the DC voltage
Device determines the operation of DC low-voltage control model by described；
1015, the main switch of closure the 4th Single port circuit, the energy storage device of unlock the 4th Single port circuit,
The grid-connected inverter that photovoltaic devices, charging unit, AC load and DC load switch, the energy storage device, photovoltaic dress
It sets, the grid-connected inverter of the charging unit, the AC load and the DC load switch is by set control model
Operation.
Preferably, step 103A is specifically included:
If A1, receiving normal halt instruction, the normal halt instruction is sent to each function of the DC distribution net
The inverter that rate is controllably held, so that power is dropped to zero according to presetting slope by the inverter that each power is controllably held；
A2, the converter blocking for controllably holding each power；
A3, the AC circuit breaker and dc circuit breaker for disconnecting each port circuit.
Preferably, step 103B is specifically included:
If B1, receiving emergent stopping instruction, emergent stopping instruction is sent to each function of the DC distribution net
The inverter that rate is controllably held, so that the inverter controllably held of each power is by the direct zero setting of power；
B2, the converter blocking for controllably holding each power；
B3, the AC circuit breaker and dc circuit breaker for disconnecting each port circuit.
Preferably, the grid-connected inverter of the energy storage device is bi-directional DC-DC inverter, and control model is constant dc power control
Mode.
Preferably, the grid-connected inverter of the photovoltaic devices is the unidirectional Boost inverter that power is directed toward direct current system, control
Molding formula is constant DC voltage control mode, to realize the maximal power tracing of photovoltaic array.
Preferably, the grid-connected inverter of the charging unit is that power is directed toward battery Boost copped wave inverter, control model
For constant dc power control mode.
Preferably, the grid-connected inverter of the AC load is bridge-type inverter structure, and control model is that V-F controls mould
Formula.
The application second aspect additionally provides a kind of DC distribution net start stop apparatus based on stelliform connection topology configuration, by
The stelliform connection topology configuration that port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit are constituted one by one
DC distribution net system in apply, comprise the following modules:
Normal starting module, in the enabled instruction for receiving power grid, successively start the first Single port circuit,
The second Single port circuit, the third Single port circuit and the 4th Single port circuit；
Normal stoppage in transit module, for when receiving normal halt instruction, by the first Single port circuit, described second
The power of Single port circuit, the third Single port circuit and all inverters in the 4th Single port circuit is by preset oblique
Rate is reduced to zero, is latched all inverters, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that
The DC distribution net system is normally stopped transport；
Emergency outage module, for receive emergent stopping instruction when, by the first Single port circuit, described second
The power zero setting of Single port circuit, the third Single port circuit and all inverters in the 4th Single port circuit, is closed
All inverters are locked, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that the DC distribution
Net system emergency is stopped transport.
The application third aspect additionally provides a kind of DC distribution net start and stop equipment based on stelliform connection topology configuration, described to set
Standby includes processor and memory；
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for according to the instruction execution first aspect in said program code based on star topology
The DC distribution net start and stop method of structure.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
In the application, a kind of DC distribution net start and stop method based on stelliform connection topology configuration is provided, for by first
The stelliform connection topology configuration that Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit are constituted
DC distribution net system, comprising the following steps: 101, in the enabled instruction for receiving power grid, successively start the first Single port electricity
Road, the second Single port circuit, third Single port circuit and the 4th Single port circuit；102A, when receiving normal halt instruction,
By all inverters in the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit
Power be reduced to zero by presetting slope, be latched all inverters, and disconnect the AC circuit breaker and direct current of each Single port circuit
Breaker, so that DC distribution net system is normally stopped transport；102B, receive emergent stopping instruction when, by the first Single port electricity
The power zero setting on road, the second Single port circuit, third Single port circuit and all inverters in the 4th Single port circuit, locking
All inverters, and the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that DC distribution net system emergency
It stops transport.
DC distribution net start and stop method provided by the present application based on stelliform connection topology configuration, refers in the starting for receiving power grid
When enabling, successively start the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit, when
When receiving normal halt instruction, zero is dropped to according to presetting slope by adjusting the power of all inverters, is latched all change
Device is flowed, disconnects the AC circuit breaker and dc circuit breaker at each end, realizes the normal stoppage in transit to entire DC distribution net, when receiving
When emergent stopping instructs, by adjusting the direct zero setting of converter power, all inverters are latched, disconnect the AC circuit breaker at each end
And dc circuit breaker, it realizes the emergency outage to entire DC distribution net, the side by slope drop power is taken in normal stop transport
Formula is gently stopped transport, and in emergency outage, directly by the power zero setting of inverter, is realized quick stoppage in transit in emergency circumstances, is mentioned
The high operation stability and reliability of the DC distribution net of stelliform connection topology configuration.
Detailed description of the invention
Fig. 1 is a kind of one embodiment of the DC distribution net start and stop method based on stelliform connection topology configuration provided by the present application
Flow diagram；
Fig. 2 is a kind of another implementation of DC distribution net start and stop method based on stelliform connection topology configuration provided by the present application
The flow diagram of example；
Fig. 3 is a kind of another implementation of the DC distribution net start and stop method based on stelliform connection topology configuration provided by the present application
The flow diagram of example
Fig. 4 is a kind of one embodiment of the DC distribution net start stop apparatus based on stelliform connection topology configuration provided by the present application
Structural schematic diagram；
Fig. 5 is the system architecture diagram of the DC distribution net of the stelliform connection topology configuration provided in the embodiment of the present application；
Fig. 6 is imitative for building on RTDS emulation platform to the system architecture diagram in Fig. 4 for providing in the embodiment of the present application
True system construction drawing.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
It should be noted that the DC distribution net start and stop method based on stelliform connection topology configuration provided in the embodiment of the present application
Applied to by the first Single port circuit T1, the second Single port circuit T2, third Single port circuit T3 and the 4th Single port circuit T4
The control method of the DC distribution net system of the stelliform connection topology configuration of composition, those skilled in the art can be in the embodiment of the present application
On the basis of do not pay laborious creation in the case where method provided by the embodiments of the present application is applied based on same framework
In star-like DC distribution net system, the DC distribution net system architecture diagram of the stelliform connection topology configuration provided in the embodiment of the present application is such as
Shown in Fig. 5, analogous diagram is as shown in fig. 6, the first Single port circuit T1 includes: the first AC network ACgrid1, the first exchange mother
Line #6, the first transformer TM1, the first AC circuit breaker ACCB1 and the first inverter MMC-VSC1；Second Single port circuit T2 packet
It includes: the second AC network Acgrid2, the second ac bus #7, the second transformer TM2, the second AC circuit breaker ACCB2 and second
Inverter MMC-VSC2；Third Single port circuit T3 includes: third AC network Acgrid3, third ac bus #8, third change
Depressor TM3, third AC circuit breaker ACCB3 and third inverter MMC-VSC3；4th Single port circuit T4 includes: direct current transformation
Device DCSST, the 8th dc circuit breaker DCCB8, the 9th dc circuit breaker DCCB9, the tenth dc circuit breaker DCCB10, the tenth are always
Flow breaker DCCB11, the 12nd dc circuit breaker DCCB12, the first DC/DC converter C1, the 2nd DC/DC converter C2, the
Three DC/DC converter C3, AC/DC converter C4, DC bus #5, photovoltaic, energy storage, charging unit, DC load with exchange it is negative
It carries.
One end of first dc circuit breaker DCCB1 is successively through the first DC line L1, the first DC bus #1, the 4th direct current
Breaker DCCB4, the first inverter MMC-VSC1, the first AC circuit breaker ACCB1, the first ac bus #6, the first transformer
TM1 is connect with the first AC network ACgrid1, and the other end is connect with central node Node1；Second dc circuit breaker DCCB2
One end successively through the second DC line L2, the second DC bus #2, the 5th dc circuit breaker DCCB5, the second inverter MMC-
VSC2, the second AC circuit breaker ACCB2, the second ac bus #7, the second transformer TM2 and the second AC network ACgrid2 connect
It connects, the other end is connect with central node Node1；One end of third dc circuit breaker DCCB3 successively through third DC line L3,
Third DC bus #3, the 6th dc circuit breaker DCCB6, third inverter MMC-VSC3, third AC circuit breaker ACCB3,
Three ac bus #8, third transformer TM3 are connect with third AC network ACgrid3, and the other end and central node Node1 connect
It connects；The high-pressure side of commutator transformer DCSST is successively through the 7th dc circuit breaker DCCB7, the 4th DC bus #4 and third direct current
Route L3 carries out T and connects, and low-pressure end is connect with the 5th DC bus #5；Photovoltaic is successively through the first DC/DC converter C1, the 8th straight
Stream breaker DCCB8 is connect with the 5th DC bus #5；Charging pile is successively through the 2nd DC/DC converter C2, the 9th dc circuit breaker
DCCB9 is connect with the 5th DC bus #5；Energy storage is successively through the 3rd DC/DC converter C3, the tenth dc circuit breaker DCCB10 and
5 DC bus #5 connections；DC load is connect through the 11st dc circuit breaker DCCB11 with the 5th DC bus #5；AC load
Successively it is connect through AC/DC converter C4, the 12nd dc circuit breaker DCCB12 with the 5th DC bus #5.
In order to make it easy to understand, referring to Fig. 1, a kind of DC distribution net based on stelliform connection topology configuration provided by the present application opens
Stop one embodiment of method, comprising the following steps:
Step 101, in the enabled instruction for receiving power grid, successively start the first Single port circuit T1, the second Single port
Circuit T2, third Single port circuit T3 and the 4th Single port circuit T4.
It should be noted that setting each end inverter by DC distribution net system-level controller in the embodiment of the present application
Control model, according to the first Single port circuit T1 is first started, restart second one end in the enabled instruction for receiving power grid
Mouth circuit T2, then starts third Single port circuit T3, finally starts the sequence of the 4th Single port circuit T4, to DC distribution net
Normal startup mode orderly controlled, the steady ordered of entire DC distribution net is started to realize.
Step 102A, when receiving normal halt instruction, by the first Single port circuit, the second Single port circuit, third
The power of Single port circuit and all inverters in the 4th Single port circuit is reduced to zero by presetting slope, is latched all changes of current
Device, and the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that DC distribution net system is normally stopped transport.
It should be noted that in the embodiment of the present application, when the stoppage in transit instruction that system receives is normal halt instruction, control
Make all inverters in the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port circuit
Power be reduced to zero by presetting slope, be then latched all inverters, and disconnect the AC circuit breaker of each port circuit and straight
Breaker is flowed, so that entire DC distribution net can be realized steady stoppage in transit.
Step 102B, when receiving emergent stopping instruction, by the first Single port circuit, the second Single port circuit, third
The power zero setting of Single port circuit and all inverters in the 4th Single port circuit is latched all inverters, and disconnects each one
The AC circuit breaker and dc circuit breaker of port circuit, so that DC distribution net system emergency is stopped transport.
It should be noted that being emergent stopping instruction, explanation in the stoppage in transit instruction that system receives in the embodiment of the present application
System is in the hole, needs emergency outage, controls the first Single port circuit T1, the second Single port circuit T2, third at this time
The direct zero setting of power of Single port circuit T3 and all inverters in the 4th Single port circuit T4, are then latched all changes of current
Device, and the AC circuit breaker and dc circuit breaker of each port circuit are disconnected, so that entire DC distribution net can be realized and quickly stop
Fortune, avoid stopping transport leads to security risk not in time.
The DC distribution net start and stop method based on stelliform connection topology configuration provided in the embodiment of the present application, is receiving power grid
Enabled instruction when, successively start the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port
Circuit drops to zero according to presetting slope by adjusting the power of all inverters, locking when receiving normal halt instruction
All inverters disconnect the AC circuit breaker and dc circuit breaker at each end, realize the normal stoppage in transit to entire DC distribution net, when
When receiving emergent stopping instruction, by adjusting the direct zero setting of converter power, all inverters are latched, disconnect the exchange at each end
Breaker and dc circuit breaker realize the emergency outage to entire DC distribution net, take in normal stop transport and drop function by slope
The mode of rate is gently stopped transport, in emergency outage, directly by the power zero setting of inverter, realize in emergency circumstances quickly stop
Fortune, improves the operation stability and reliability of the DC distribution net of stelliform connection topology configuration.
In order to make it easy to understand, referring to Fig. 2, a kind of DC distribution net based on stelliform connection topology configuration provided by the present application opens
Stop another embodiment of method, comprising the following steps:
The control model of the inverter of first Single port circuit is configured to determine Udc-Q control model by step 201, and second
The control model of the inverter of the second inverter and third Single port circuit of Single port circuit is each configured to determine P-Q control mould
Formula, the control model of the commutator transformer of the 4th Single port circuit are configured to determine DC low-voltage control model.
It should be noted that in the embodiment of the present application, the DC distribution net based on stelliform connection topology configuration at runtime, first
The first inverter MMC-VSC1 of Single port circuit T1 is used using DC voltage and Reactive Power Control mode is determined and is determined Udc-
Q control model, the second inverter MMC-VSC2 of the second Single port circuit T2, which is used, determines active power and Reactive Power Control side
Formula determines P-Q control model, the third inverter MMC-VSC3 of third Single port circuit T3, which is used, determines active power and idle function
Rate control mode determines P-Q control model, the 4th Single port circuit T4 commutator transformer, which uses, determines low-voltage dc voltage controlling party
Formula.
Step 202, the charge circuit for being closed the first Single port circuit, the second Single port circuit and third Single port circuit are opened
It closes, uncontrollable rectification charging is carried out to DC network by AC system, after the completion of uncontrollable rectification charging, control is configured to
Determine the first Single port circuit unlock starting of Udc-Q control model.
It should be noted that in the embodiment of the present application, after the control model for configuring good each circuit, it is necessary first to be closed the
The charge circuit of port circuit T1, the second Single port circuit T2 and third Single port circuit T3 switch one by one, i.e. auxiliary switch, hand over
Streaming system carries out uncontrollable whole to the first inverter MMC-VSC1, the second inverter MMC-VSC2 and third inverter MMC-VSC3
The voltage of current charge, DC distribution net is elevated.
Step 203, after the DC voltage of the first Single port circuit reaches preset reference value, successively solution locking P-Q control
The the second Single port circuit and third Single port circuit of mode, the first Single port circuit of closure, the second Single port circuit and third
The main switch of Single port circuit, by charge circuit switch bypass, promote the second Single port circuit and third Single port circuit has
Function power.
It should be noted that during the voltage of DC distribution net is elevated in step 202, at a certain moment (13s)
Voltage increase is to 0.7Pu, and the first Single port circuit T1 side controller valve control unlock, the first end Single port circuit T1 is with the 2nd 1
After port circuit T2 and third Single port circuit T3 promotes DC voltage 1Pu, the main switch of the first Single port circuit T1 is closed,
Unlock the second inverter MMC-VSC2 and third inverter MMC- of the second Single port circuit T2 and third Single port circuit T3
Then VSC3 closes the main switch of the second Single port circuit T2 and third Single port circuit T3, system enters the idle running stage,
Second Single port circuit T2 starts by set slope hoisting power to 0.4Pu, and third Single port circuit T3 hoisting power arrives
0.2Pu, the first Single port circuit T1, the second Single port circuit T2 and third Single port circuit T3 stable operation.
Step 204, after the active power of the second Single port circuit and third Single port circuit reaches preset power value,
Start the 4th Single port circuit, promote direct current transformer low-pressure side DC voltage, so that direct current transformer, which is pressed, determines DC low-voltage control
Mode operation processed.
Step 205, the main switch for being closed the 4th Single port circuit unlock energy storage device, the photovoltaic of the 4th Single port circuit
Device, charging unit, AC load and DC load switch grid-connected inverter, energy storage device, photovoltaic devices, charging unit,
The grid-connected inverter of AC load and DC load switch is run by set control model.
It should be noted that after DC voltage is established at the first end Single port circuit T1, the 4th end Single port circuit T4
Closed high side switch, charges to commutator transformer high pressure lateral capacitance by charging resistor, establishes DC voltage, and direct current becomes
Depressor controller unlocks the side change of current of commutator transformer high voltage/low voltage, and commutator transformer low pressure charges by slope, direct current is become
Depressor voltage charges to 1Pu.After charging complete, low-side switch is closed, DC low-voltage side bus is ± 0.375kV, is then stored up
It can control device and unlock its grid-connected inverter, energy storage presses slope for the power ascension of injection DC low-voltage bus to 1MW.Photovoltaic simultaneously
Controller unlocks its grid-connected inverter, and by maximal power tracing algorithm, the power for controlling photovoltaic array injection DC grid reaches
To 0.7MW.DC load is incorporated to commutator transformer low-voltage bus bar, power 0.5MW by dc circuit breaker.AC load is grid-connected
Controller controls three-phase bridge type converter exchange side voltage and promotes virtual value by slope, absorbs the active of 0.5MW from DC grid
Power.Finally, charging pile controller unlocks its gird-connected inverter, charge power is promoted by slope and reaches 1MW.So far, entire straight
Stream power distribution network completes starting and power ascension process, and entire star-like DC distribution net enters steady operational status.
Step 206A, when receiving normal halt instruction, by the first Single port circuit, the second Single port circuit, third
The power of Single port circuit and all inverters in the 4th Single port circuit is reduced to zero by presetting slope, is latched all changes of current
Device, and the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that DC distribution net system is normally stopped transport.
It should be noted that step 206A is consistent with the step 102A in one embodiment in the embodiment of the present application,
This is no longer repeated.
Step 206B, when receiving emergent stopping instruction, by the first Single port circuit, the second Single port circuit, third
The power zero setting of Single port circuit and all inverters in the 4th Single port circuit is latched all inverters, and disconnects each one
The AC circuit breaker and dc circuit breaker of port circuit, so that DC distribution net system emergency is stopped transport.
It should be noted that step 206B is consistent with the step 102B in one embodiment in the embodiment of the present application,
This is no longer repeated.
In order to make it easy to understand, referring to Fig. 3, a kind of DC distribution net based on stelliform connection topology configuration provided herein
The third embodiment of start and stop method, comprising:
The control model of the inverter of first Single port circuit is configured to determine Udc-Q control model by step 301, and second
The control model of the inverter of the second inverter and third Single port circuit of Single port circuit is each configured to determine P-Q control mould
Formula, the control model of the commutator transformer of the 4th Single port circuit are configured to determine DC low-voltage control model.
It should be noted that the step 301 in the embodiment of the present application is consistent with the step 201 in second embodiment,
This is no longer repeated.
Step 302, the charge circuit for being closed the first Single port circuit, the second Single port circuit and third Single port circuit are opened
It closes, uncontrollable rectification charging is carried out to DC network by AC system, after the completion of uncontrollable rectification charging, control is configured to
Determine the first Single port circuit unlock starting of Udc-Q control model.
It should be noted that the step 302 in the embodiment of the present application is consistent with the step 202 in second embodiment,
This is no longer repeated.
Step 303, after the DC voltage of the first Single port circuit reaches preset reference value, successively solution locking P-Q control
The the second Single port circuit and third Single port circuit of mode, the first Single port circuit of closure, the second Single port circuit and third
The main switch of Single port circuit, by charge circuit switch bypass, promote the second Single port circuit and third Single port circuit has
Function power.
It should be noted that the step 303 in the embodiment of the present application is consistent with the step 203 in second embodiment,
This is no longer repeated.
Step 304, after the active power of the second Single port circuit and third Single port circuit reaches preset power value,
Start the 4th Single port circuit, promote direct current transformer low-pressure side DC voltage, so that direct current transformer, which is pressed, determines DC low-voltage control
Mode operation processed.
It should be noted that the step 304 in the embodiment of the present application is consistent with the step 204 in second embodiment,
This is no longer described in detail.
Step 305, the main switch for being closed the 4th Single port circuit unlock energy storage device, the photovoltaic of the 4th Single port circuit
Device, charging unit, AC load and DC load switch grid-connected inverter, energy storage device, photovoltaic devices, charging unit,
The grid-connected inverter of AC load and DC load switch is run by set control model.
It should be noted that the step 305 in the embodiment of the present application is consistent with the step 205 in second embodiment,
This is no longer repeated.
If step 306A, receiving normal halt instruction, normal halt instruction is sent to each power of DC distribution net
The inverter controllably held, so that power is dropped to zero according to presetting slope by the inverter that each power is controllably held.
It should be noted that after receiving normal halt instruction, normal halt instruction is sent in the embodiment of the present application
The inverter controllably held to each power of DC distribution net, the inverter that each power is controllably held according to normal halt instruction information,
Own power is lowered by presetting slope, until power is 0.
Step 307A, the converter blocking for controllably holding each power.
It should be noted that after the power of each inverter falls to 0, needing can by each power in the embodiment of the present application
Control end converter blocking processing, that is, be latched the inverter of the first Single port circuit T1, the inverter of the second Single port circuit T2,
Inverter, energy storage device, AC load, charging unit and the commutator transformer photovoltaic of third Single port circuit T3.
Step 308A, the AC circuit breaker and dc circuit breaker of each port circuit are disconnected.
It should be noted that in the embodiment of the present application, after each converter blocking controllably held, by each port circuit
AC circuit breaker and dc circuit breaker disconnect, that is, complete the normal stoppage in transit work of DC distribution net.
If step 306B, receiving emergent stopping instruction, emergent stopping instruction is sent to each power of DC distribution net
The inverter controllably held, so that the inverter controllably held of each power is by the direct zero setting of power.
It should be noted that in the embodiment of the present application after receiving emergent stopping instruction, emergent stopping being instructed and is sent out
The inverter that each power to DC distribution net is controllably held is sent, the inverter that each power is controllably held is instructed according to emergent stopping to be believed
Breath, directly by the power zero setting of itself.
Step 307B, the converter blocking for controllably holding each power.
It should be noted that the power of each inverter is directly reduced to after 0 in the embodiment of the present application, need each power
The converter blocking processing controllably held, that is, be latched the change of current of the inverter, the second Single port circuit T2 of the first Single port circuit T1
Inverter, energy storage device, AC load, charging unit and the commutator transformer photovoltaic of device, third Single port circuit T3.
Step 308B, the AC circuit breaker and dc circuit breaker of each port circuit are disconnected.
It should be noted that in the embodiment of the present application, after each converter blocking controllably held, by each port circuit
AC circuit breaker and dc circuit breaker disconnect, that is, complete the emergency outage work of DC distribution net.
Further, the grid-connected inverter of energy storage is bi-directional DC-DC inverter, and control model is constant dc power control mode.
Further, the grid-connected inverter of photovoltaic is the unidirectional Boost inverter that power is directed toward direct current system, control model
For constant DC voltage control mode, to realize the maximal power tracing of photovoltaic array.
Further, the grid-connected inverter of charging unit is that power is directed toward battery Boost copped wave inverter, and control model is
Constant dc power control mode.
Further, the grid-connected inverter of AC load is bridge-type inverter structure, and control model is V-F control model.
The DC distribution net start and stop method based on stelliform connection topology configuration in the embodiment of the present application is in DC distribution net system
When middle operation, the first inverter MMC-VSC1 at the first end Single port circuit T1, which is used, determines DC voltage and reactive power (i.e.
Udc-Q) control mode, the second inverter MMC-VSC2 at the second end Single port circuit T2, which is used, determines active power and reactive power
(i.e. P-Q) control mode, the third inverter MMC-VSC3 of third Single port circuit T3, which is used, determines active power and reactive power
(i.e. P-Q) control mode, the commutator transformer at the 4th end Single port circuit T4, which uses, determines low-voltage dc voltage control mode.Energy storage
The grid-connected inverter of device is bi-directional DC-DC inverter, and control model is constant dc power control mode, the grid-connected change of current of photovoltaic devices
Device is the single phase boost inverter that power is directed toward direct current system, and control model is constant DC voltage control, to realize photovoltaic array
Maximal power tracing；The inverter that AC load is incorporated to DC grid is bridge-type inverter structure, using V-F control model
(guaranteeing the output voltage control model directly proportional with frequency), the grid-connected inverter of charging unit are that power is directed toward battery Boost
Copped wave inverter, control model are constant dc power control mode；DC load can be directly incorporated into commutator transformer low-pressure side.
In the embodiment of the present application, after the first Single port circuit T1 establishes DC voltage, the 4th Single port circuit end is closed
High side switch is closed, is charged by charging resistor to commutator transformer high pressure lateral capacitance, establishes DC voltage, direct current transformation
Device controller unlocks the side change of current of commutator transformer high voltage/low voltage, and commutator transformer low pressure charges by slope, by direct current transformation
Device voltage is rushed to summit to 1Pu.After charging complete, Buddhist monk's low-side switch, DC low-voltage side bus is ± 0.375kV, then energy storage
Controller unlocks its grid-connected inverter, and energy storage presses slope for the power ascension of injection DC low-voltage bus to 1MW.Photovoltaic control simultaneously
Device processed unlocks its grid-connected inverter, and by maximal power tracing algorithm, the power for controlling photovoltaic array injection DC grid reaches
0.7MW.DC load is incorporated to commutator transformer low-voltage bus bar, power 0.5MW by dc circuit breaker.AC load and network control
Device control three-phase bridge type converter exchange side voltage processed promotes virtual value by slope, and the wattful power of 0.5MW is absorbed from DC grid
Rate.Finally, charging pile controller unlocks its gird-connected inverter, charge power is promoted by slope and reaches 1MW, so far, entire direct current
Power distribution network completes starting and power ascension process, and entire star-like DC distribution net enters steady operational status.
In conclusion the DC distribution net start and stop method based on stelliform connection topology configuration provided in the embodiment of the present application has
Following advantages and beneficial effects:
(1) the starting control for realizing the DC distribution net based on stelliform connection topology configuration, passes through a end of DC distribution net
Mouthful inverter coordinated completes never controlled rectification and is charged to DC voltage and arrives power again by slope promotion and transmits by slope
Overall process start control, by the orderly cooperation to commutator transformer element, realize energy storage, photovoltaic, AC load, directly
Stream load and charging unit it is smooth grid-connected.
(2) the normal stoppage in transit control mode of the method provided in the embodiment of the present application is the power by controllably holding to power
0 is fallen to by slope, locking inverter, grid-connected switch is cut off, realizes the gentle stoppage in transit of DC distribution net, the power of inverter
Fluctuate small, system is more stable.
(3) the emergency outage control mode of the method provided in the embodiment of the present application is the power by controllably holding to power
Direct quick zero setting, is latched inverter, cuts off grid-connected switch, realizes the quick emergency outage of DC distribution net, can satisfy
The case where needing emergency outage use.
(4) method provided in the embodiment of the present application is easy to operate, adaptable, is providing the stability of DC distribution net
And have bright prospects in reliability.
In order to make it easy to understand, referring to Fig. 4, a kind of DC distribution net based on stelliform connection topology configuration provided herein
The embodiment of start stop apparatus, by the first Single port circuit, the second Single port circuit, third Single port circuit and the 4th Single port
It applies, comprises the following modules in the DC distribution net system for the stelliform connection topology configuration that circuit is constituted:
Normal starting module 301, in the enabled instruction for receiving power grid, successively start the first Single port circuit,
Second Single port circuit, third Single port circuit and the 4th Single port circuit.
Normal stoppage in transit module 302, for when receiving normal halt instruction, by the first Single port circuit, second one end
The power of mouth circuit, third Single port circuit and all inverters in the 4th Single port circuit is reduced to zero by presetting slope,
All inverters are latched, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that DC distribution net system
It is normal to stop transport.
Emergency outage module 303, for receive emergent stopping instruction when, by the first Single port circuit, second one end
The power zero setting of mouth circuit, third Single port circuit and all inverters in the 4th Single port circuit, is latched all inverters,
And the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that DC distribution net system emergency is stopped transport.
Further, normal starting module 301 specifically includes:
Scheme control subelement 3011, for being configured to the control model of the inverter of the first Single port circuit to determine Udc-
The control model of Q control model, the inverter of the second inverter and third Single port circuit of the second Single port circuit configures
To determine P-Q control model, the control model of the commutator transformer of the 4th Single port circuit is configured to determine DC low-voltage control model.
First unlock subelement 3012, for being closed the first Single port circuit, the second Single port circuit and third Single port
The charge circuit of circuit switchs, and uncontrollable rectification charging is carried out to DC network by AC system, in uncontrollable rectification charging
After the completion, control is configured to determine the first Single port circuit unlock starting of Udc-Q control model.
Second unlock subelement 3013, for after the DC voltage of the first Single port circuit reaches preset reference value, according to
The the second Single port circuit and third Single port circuit of secondary solution locking P-Q control model, are closed the first Single port circuit, the 2nd 1
Charge circuit switch bypass is promoted the second Single port circuit and third by the main switch of port circuit and third Single port circuit
The active power of Single port circuit.
Third unlocks subelement 3014, for reaching when the active power of the second Single port circuit and third Single port circuit
After preset power value, start the 4th Single port circuit, direct current transformer low-pressure side DC voltage is promoted, so that direct current transformer
It is run by DC low-voltage control model is determined.
4th unlock subelement 3015 unlocks the 4th Single port circuit for being closed the main switch of the 4th Single port circuit
Energy storage device, photovoltaic devices, charging unit, AC load and DC load switch grid-connected inverter, energy storage device, photovoltaic
The grid-connected inverter that device, charging unit, AC load and DC load switch is run by set control model.
Further, normal stoppage in transit module 303 specifically includes:
First subelement 3031, if normal halt instruction is sent to DC distribution for receiving normal halt instruction
The inverter that each power of net is controllably held, so that power is dropped to zero according to presetting slope by the inverter that each power is controllably held.
Second subelement 3032, the converter blocking for controllably holding each power.
Third subelement 3033, for disconnecting the AC circuit breaker and dc circuit breaker of each port circuit.
Further, emergency outage module 304 specifically includes:
If the 4th subelement 3041 is instructed for receiving emergent stopping, emergent stopping instruction is sent to DC distribution
The inverter controllably held of each power of net, so that the inverter controllably held of each power is by the direct zero setting of power.
5th subelement 3042, the converter blocking for controllably holding each power.
6th subelement 3043, for disconnecting the AC circuit breaker and dc circuit breaker of each port circuit.
Further, the grid-connected inverter of energy storage device is bi-directional DC-DC inverter, and control model is constant dc power control mould
Formula.
Further, the grid-connected inverter of photovoltaic devices is the unidirectional Boost inverter that power is directed toward direct current system, control
Mode is constant DC voltage control mode, to realize the maximal power tracing of photovoltaic array.
Further, the grid-connected inverter of charging unit is that power is directed toward battery Boost copped wave inverter, and control model is
Constant dc power control mode.
Further, the grid-connected inverter of AC load is bridge-type inverter structure, and control model is V-F control model.
The embodiment for the DC distribution net start and stop equipment based on stelliform connection topology configuration that present invention also provides a kind of is based on star
The DC distribution net start and stop equipment of type topological structure includes processor and memory；
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for above-mentioned based on the straight of stelliform connection topology configuration according to the instruction execution in said program code
Flow DC distribution net start and stop method of any one of the power distribution network start and stop embodiment of the method based on stelliform connection topology configuration.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, system embodiment described above is only schematical, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another device is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of system or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the application
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (full name in English: Read-Only
Memory, english abbreviation: ROM), random access memory (full name in English: Random Access Memory, english abbreviation:
RAM), the various media that can store program code such as magnetic or disk.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of DC distribution net start and stop method based on stelliform connection topology configuration is applied to by the first Single port circuit, the 2nd 1
The DC distribution net system for the stelliform connection topology configuration that port circuit, third Single port circuit and the 4th Single port circuit are constituted,
It is characterized in that, comprising the following steps:
101, in the enabled instruction for receiving power grid, successively start the first Single port circuit, second Single port electricity
Road, the third Single port circuit and the 4th Single port circuit；
102A, when receiving normal halt instruction, by the first Single port circuit, the second Single port circuit, described
The power of third Single port circuit and all inverters in the 4th Single port circuit is reduced to zero by presetting slope, locking
All inverters, and the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that the DC distribution net
System is normally stopped transport；
102B, when receiving emergent stopping instruction, by the first Single port circuit, the second Single port circuit, described
The power zero setting of third Single port circuit and all inverters in the 4th Single port circuit is latched all changes of current
Device, and the AC circuit breaker and dc circuit breaker of each Single port circuit are disconnected, so that the DC distribution net system emergency is stopped transport.
2. the DC distribution net start and stop method according to claim 1 based on stelliform connection topology configuration, which is characterized in that step
101 specifically include:
1011, configure to determine Udc-Q control model for the control model of the inverter of the first Single port circuit, described second
The control model of the inverter of second inverter of Single port circuit and the third Single port circuit is each configured to determine P-Q control
The control model of mode, the commutator transformer of the 4th Single port circuit is configured to determine DC low-voltage control model；
1012, it is closed the charging of the first Single port circuit, the second Single port circuit and the third Single port circuit
Circuit switching carries out uncontrollable rectification charging to DC network by AC system, after the completion of the uncontrollable rectification charging,
Control is configured to the first Single port circuit unlock starting for determining Udc-Q control model；
1013, after the DC voltage of the first Single port circuit reaches preset reference value, successively unlock it is described determine P-Q control
The the second Single port circuit and the third Single port circuit of mode are closed the first Single port circuit, described second
The charge circuit switch bypass is promoted the described 2nd 1 by the main switch of Single port circuit and the third Single port circuit
The active power of port circuit and the third Single port circuit；
1014, when the active power of the second Single port circuit and the third Single port circuit reach preset power value it
Afterwards, start the 4th Single port circuit, the direct current transformer low-pressure side DC voltage is promoted, so that the direct current transformer
The operation of DC low-voltage control model is determined by described；
1015, it is closed the main switch of the 4th Single port circuit, unlocks energy storage device, the photovoltaic of the 4th Single port circuit
The grid-connected inverter that device, charging unit, AC load and DC load switch, the energy storage device, the photovoltaic devices, institute
The grid-connected inverter for stating charging unit, the AC load and DC load switch is run by set control model.
3. the DC distribution net start and stop method according to claim 1 based on stelliform connection topology configuration, which is characterized in that step
102A is specifically included:
If A1, receiving normal halt instruction, each power that the normal halt instruction is sent to the DC distribution net can
The inverter for controlling end, so that power is dropped to zero according to presetting slope by the inverter that each power is controllably held；
A2, the converter blocking for controllably holding each power；
A3, the AC circuit breaker and dc circuit breaker for disconnecting each port circuit.
4. the DC distribution net start and stop method according to claim 1 based on stelliform connection topology configuration, which is characterized in that step
102B is specifically included:
If B1, receiving emergent stopping instruction, each power that emergent stopping instruction is sent to the DC distribution net can
The inverter at end is controlled, so that the inverter controllably held of each power is by the direct zero setting of power；
B2, the converter blocking for controllably holding each power；
B3, the AC circuit breaker and dc circuit breaker for disconnecting each port circuit.
5. the DC distribution net start and stop method according to claim 2 based on stelliform connection topology configuration, which is characterized in that described
The grid-connected inverter of energy storage device is bi-directional DC-DC inverter, and control model is constant dc power control mode.
6. the DC distribution net start and stop method according to claim 2 based on stelliform connection topology configuration, which is characterized in that described
The grid-connected inverter of photovoltaic devices is the unidirectional Boost inverter that power is directed toward direct current system, and control model is to determine DC voltage
Control model, to realize the maximal power tracing of photovoltaic array.
7. the DC distribution net start and stop method according to claim 2 based on stelliform connection topology configuration, which is characterized in that described
The grid-connected inverter of charging unit is that power is directed toward battery Boost copped wave inverter, and control model is constant dc power control mode.
8. the DC distribution net start and stop method according to claim 2 based on stelliform connection topology configuration, which is characterized in that described
The grid-connected inverter of AC load is bridge-type inverter structure, and control model is V-F control model.
9. a kind of DC distribution net start stop apparatus based on stelliform connection topology configuration, by the first Single port circuit, the second Single port
It is applied in the DC distribution net system for the stelliform connection topology configuration that circuit, third Single port circuit and the 4th Single port circuit are constituted,
It is characterised in that it includes with lower module:
Normal starting module, in the enabled instruction for receiving power grid, successively starting the first Single port circuit, described
Second Single port circuit, the third Single port circuit and the 4th Single port circuit；
Normal stoppage in transit module, for when receiving normal halt instruction, by the first Single port circuit, described second one end
The power of mouth circuit, the third Single port circuit and all inverters in the 4th Single port circuit is dropped by presetting slope
Down to zero, all inverters are latched, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that described
DC distribution net system is normally stopped transport；
Emergency outage module, for receive emergent stopping instruction when, by the first Single port circuit, described second one end
The power zero setting of mouth circuit, the third Single port circuit and all inverters in the 4th Single port circuit, is latched institute
There is the inverter, and disconnect the AC circuit breaker and dc circuit breaker of each Single port circuit, so that DC distribution net system
System emergency outage.
10. a kind of DC distribution net start and stop equipment based on stelliform connection topology configuration, which is characterized in that the equipment includes processor
And memory；
Said program code is transferred to the processor for storing program code by the memory；
The processor is used for described in any item based on star-like according to the instruction execution claim 1-8 in said program code
The DC distribution net start and stop method of topological structure.
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| CN113612380A (en) * | 2021-08-27 | 2021-11-05 | 国网江苏省电力有限公司电力科学研究院 | Start-stop method and device for converter of comprehensive energy station |
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