CN109638897A - A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network - Google Patents
A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network Download PDFInfo
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Classifications
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/385—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses one kind to be suitable for alternating current-direct current mixing power distribution network cooperative control method, step 1: builds suitable for alternating current-direct current mixing power distribution network cooperative control system；Step 2: the operational mode of alternating current-direct current mixing power distribution network is defined；Step 3: according to the different operational modes of alternating current-direct current mixing power distribution network, the control method of flexible interconnection device, energy-storage system of accumulator and photovoltaic generation unit is adjusted.The present invention compares the control method of traditional alternating current-direct current mixing power distribution network, can further increase the power supply reliability of alternating current-direct current mixing power distribution network.
Description
Technical field
The present invention relates to a kind of cooperative control methods suitable for alternating current-direct current mixing power distribution network, belong to Automation of Electric Systems
Technical field.
Background technique
Currently, with the expansion of AC network scale, the raising of voltage class, the capacity of short circuit of complexity exchange interconnected network
Constantly increase, run control process even more complex, the safety and stability problem of system influences more serious.Meanwhile facing data
The extensive access at center, electric car, distributed generation resource (such as photovoltaic) and LED illumination DC equipment, AC network due to
Transformation of electrical energy link is more, and the efficiency of power supply and distribution is affected.
Compared with AC network, DC grid is there is no stationary problem, it can be achieved that the flexible control of transmission power, is suitable for
The access of increasingly increased DC power supply and DC load.In DC techniques, flexible direct current technology has been acknowledged as constructing
The core technology of the following DC grid can be realized the independent decoupling control of active and reactive power, while its transient state and dynamic
There can be apparent advantage relative to traditional DC techniques, be applied to the asynchronous interconnection of great Qu, extensive new-energy grid-connected
Among equal emphasis project of transmitting and converting electricity.Relative to flourishing in transmission system, the research of DC techniques in a power distribution system
It but relatively lags behind with application.
But with being continuously increased for big city load density, the scale of power distribution network constantly expands, and is limited by capacity of short circuit, electricity
The problems such as magnet ring net, urban power distribution network usually by high pressure subregion, in press off ring in the way of run, lead to system equipment utilization rate
It reduces, reliability decrease.At the same time, requirement of the client to power supply reliability, power quality is but being continuously improved, such as big
In type city, since sensitive load is more, even if power failure in short-term also brings along biggish economic loss, or even generate tight
The social influence of weight.
Research achievement in recent years shows that the alternating current-direct current mixing power distribution network based on flexible direct current technology is more suitable for modern city
The development of power distribution network, but two kinds of different power distribution networks realize that Collaborative Control is always a great problem.And there has been no mature skills at present
Art scheme can be realized above-mentioned function.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provides a kind of be suitable for containing three end flexible interconnections
The alternating current-direct current mixing power distribution network and its cooperative control method of device.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
One kind being suitable for alternating current-direct current mixing power distribution network, comprising: three ac bus, a DC bus, three friendships
Stream bus bar side is connected separately with breaker, AC load, and the other side of breaker is connected by route with AC network；Directly
It flows bus bar side and multiple two-way buck-boost converters is connected separately with by route, wherein two-way buck-boost converter is another
One end is connected separately with photovoltaic generation unit, and the two-way buck-boost converter other end is connected with energy-storage system of accumulator, double
Load is connected with to the buck-boost converter other end；DC bus side is also connected with DC load by route；It is described straight
Stream bus is connected by the flexible interconnection apparatus module on route respectively with three ac bus.
Preferably, the two-way buck-boost converter quantity is set as four, the two-way buck- of two of them
The boost converter other end is connected separately with photovoltaic generation unit, and a two-way buck-boost converter other end is connected with
Energy-storage system of accumulator, a two-way buck-boost converter other end are connected with load.
Preferably, the DC bus side is also connected with a DC load by route.
A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network, characterized by the following steps:
Step 1: whether detection alternating current-direct current mixing power distribution network is in one-end fault mode；The one-end fault mode is only
There is flexible interconnection device corresponding exchange side in one end to break down；If so, step 2 is carried out, if not, detection alternating current-direct current is mixed
Close whether power distribution network is in normal mode；The normal mode is that event does not occur for the corresponding exchange side of three end flexible interconnection devices
Barrier；If so, step 3 is carried out, if not, end step.
Step 2: according to the one-end fault mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, batteries to store energy system
System and photovoltaic generation unit are controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), remaining
The control method of flexible interconnection device does not change, and wherein the control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s
For complex variable；
2.2: if the output power of photovoltaic generation unit is less than load power, it is defeated by flexible interconnection device that power grid exchanges side
Enter power, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side will be extra by flexible interconnection device
Power output is to side is exchanged, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work in current limliting mould
Under formula.The current-limit mode is to limit on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus electric current
Width link, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；
idcFor DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor product
Divide coefficient, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, passes through
Closed-loop control is carried out to energy-storage system of accumulator inductive current, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mould
Formula 3 carries out closed-loop control to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electricity
Stream；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to photovoltaic generation unit
Output power P and the relationship of output voltage U of photovoltaic generation unit controlled, control equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is
The output electric current of photovoltaic cells, whenWhen, output voltage is reduced,Increase output voltage.
A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network, it is characterised in that:
Step 1: whether detection alternating current-direct current mixing power distribution network is in both-end fault mode；The both-end fault mode is to work as
There is flexible interconnection device corresponding exchange side in both ends to break down；If so, step 2 is carried out, if not, detection alternating current-direct current is mixed
Close whether power distribution network is in normal mode；The normal mode is that event does not occur for the corresponding exchange side of three end flexible interconnection devices
Barrier；If so, step 3 is carried out, if not, end step.
Step 2: according to the both-end fault mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, batteries to store energy system
System and photovoltaic generation unit are controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), remaining
The control method of flexible interconnection device does not change, and wherein the control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s
For complex variable；
2.2: if the output power of photovoltaic generation unit is less than load power, it is defeated by flexible interconnection device that power grid exchanges side
Enter power, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side will be extra by flexible interconnection device
Power output is to side is exchanged, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work in current limliting mould
Under formula.The current-limit mode is to limit on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus electric current
Width link, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；
idcFor DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor product
Divide coefficient, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, passes through
Closed-loop control is carried out to energy-storage system of accumulator inductive current, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mould
Formula 3 carries out closed-loop control to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electricity
Stream；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to photovoltaic generation unit
Output power P and the relationship of output voltage U of photovoltaic generation unit controlled, control equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is
The output electric current of photovoltaic cells, whenWhen, output voltage is reduced,Increase output voltage.
Preferably, the both-end fault mode includes: that overcharge mode, both-end failure of both-end failure is excessively put
Power mode, both-end failure current limit mode；If DC side power grid or exchange side power grid pass through the input or defeated of flexible interconnection device
When power reaches the capacity limitation of flexible interconnection device out, flexible interconnection device enables current-limit mode, as both-end failure current limit
Mode；Under both-end failure current limit mode, when photovoltaic generation unit output power is less than network load rated power, in order to steady
Constant voltage, batteries to store energy unit continuous discharge, as both-end failure over-discharge mode；When the output work of photovoltaic generation unit
Rate is greater than the sum of network load rated power, and for burning voltage, batteries to store energy unit, which is in, continues charge mode, as double
End failure overcharges mode.
A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network, it is characterised in that:
Step 1: whether detection alternating current-direct current mixing power distribution network is in three end fault modes；Three end fault mode is to work as
There is the corresponding exchange side of three end flexible interconnection devices to break down；If so, step 2 is carried out, if not, detection alternating current-direct current is mixed
Close whether power distribution network is in normal mode；The normal mode is that event does not occur for the corresponding exchange side of three end flexible interconnection devices
Barrier；If so, step 3 is carried out, if not, end step.
Step 2: according to three end fault modes of alternating current-direct current mixing power distribution network, to flexible interconnection device, batteries to store energy system
System and photovoltaic generation unit are controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), wherein
The control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s
For complex variable；
2.2: if the output power of photovoltaic generation unit is less than load power, it is defeated by flexible interconnection device that power grid exchanges side
Enter power, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side will be extra by flexible interconnection device
Power output is to side is exchanged, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work in current limliting mould
Under formula.The current-limit mode is to limit on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus electric current
Width link, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；
idcFor DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor product
Divide coefficient, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, passes through
Closed-loop control is carried out to energy-storage system of accumulator inductive current, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mould
Formula 3 carries out closed-loop control to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electricity
Stream；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to photovoltaic generation unit
Output power P and the relationship of output voltage U of photovoltaic generation unit controlled, control equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is
The output electric current of photovoltaic cells, whenWhen, output voltage is reduced,Increase output voltage.
Preferably, three end fault mode includes: that overcharge mode, three end failures of three end failures are excessively put
Power mode；When the output power of photovoltaic generation unit is greater than the sum of network load rated power, for burning voltage, battery storage
Can unit be in and continue charge mode, as three end failures overcharge mode；When the output power of photovoltaic generation unit is less than
The sum of network load rated power, for burning voltage, batteries to store energy unit is in continuous discharge mode, as three end failures
Over-discharge mode.
The utility model has the advantages that a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network provided by the invention, constructs
Alternating current-direct current mixing power distribution network cooperative control system containing three end flexible interconnection devices；Under the frame of Collaborative Control, define not
With the various operational modes of alternating current-direct current mixing power distribution network under malfunction；Secondly, being led to by operating with failure under mode specifically
The control method for crossing adjustment flexible interconnection device, energy-storage system of accumulator, photovoltaic generation unit realizes load uninterrupted power supply.
Relative to the cooperative control method of traditional alternating current-direct current mixing power distribution network, the fortune of alternating current-direct current mixing power distribution network can be further increased
Row reliability.
Detailed description of the invention
Fig. 1 is alternating current-direct current mixing power distribution network schematic diagram of the invention.
Fig. 2 is the various operational mode schematic diagrames of alternating current-direct current mixing power distribution network of the invention.
Fig. 3 is flexible interconnection device cooperative control method schematic diagram of the invention.
Fig. 4 is energy-storage system of accumulator control method schematic diagram of the invention.
Fig. 5 is photovoltaic generation unit control method schematic diagram of the invention.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
The technical solution adopted by the present invention is broadly divided into actual frame structure of the building based on current most of field engineerings,
The various operational modes for defining and analyzing alternating current-direct current mixing power distribution network, propose under various operational modes, flexible interconnection dress
It sets, the control method of energy-storage system of accumulator and photovoltaic generation unit.
As shown in Figure 1, a kind of be suitable for alternating current-direct current mixing power distribution network, comprising: three ac bus and a DC bus,
Wherein three ac bus sides are connected separately with breaker, AC load, and the other side of breaker passes through route and alternating current
Net is connected；DC bus side is separately connected by route there are four two-way buck-boost converter, and two of them are two-way
The buck-boost converter other end is connected separately with photovoltaic generation unit, and a two-way buck-boost converter other end connects
It is connected to energy-storage system of accumulator, a two-way buck-boost converter other end is connected with load；DC bus side passes through line
Road is also connected with a DC load；The DC bus and three ac bus pass through the flexible interconnection device on route respectively
Module is connected.
A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network, includes the following steps:
Step 1: it builds suitable for alternating current-direct current mixing power distribution network；
The framework reflects the applicable cases of current most of Practical Projects, studies based on containing three end flexible interconnection devices
The cooperative control method of alternating current-direct current mixing power distribution network can be to further increase the operational reliability of alternating current-direct current mixing power distribution network to establish
Fixed basis.
Step 2: as shown in Fig. 2, the operational mode of detection alternating current-direct current mixing power distribution network.
2-1: according to the exchange side of alternating current-direct current mixing power distribution network whether failure, photovoltaic generation unit and energy-storage system of accumulator
State defines the various operational modes of alternating current-direct current mixing power distribution network, including: normal mode, one-end fault mode, both-end
Fault mode, both-end failure overcharge mode, both-end failure over-discharge mode, both-end failure current limit mode, three end failures
Mode, three end failures overcharge mode, three end failure over-discharge modes.
2-2: in alternating current-direct current mixing power distribution network the corresponding exchange side of three end flexible interconnection devices do not break down as
Normal mode；
It breaks down as one-end fault mode the only corresponding exchange side of one end flexible interconnection device；
When there is flexible interconnection device corresponding exchange side in both ends to break down as both-end fault mode；If DC side power grid
Or exchange side power grid is when reaching the capacity limitation of flexible interconnection device by the input or output power of flexible interconnection device, it is soft
Property interconnect device enable current-limit mode, as both-end failure current limit mode；
Under both-end failure current limit mode, when photovoltaic generation unit output power is less than network load rated power, it is
Burning voltage, batteries to store energy unit continuous discharge, as both-end failure over-discharge mode；It is defeated when photovoltaic generation unit
Power is greater than the sum of network load rated power out, and for burning voltage, batteries to store energy unit, which is in, continues charge mode, i.e.,
It overcharges mode for both-end failure；
When there is the corresponding exchange side of three end flexible interconnection devices to break down as three end failures, when photovoltaic generation unit
Output power is greater than the sum of network load rated power, and for burning voltage, batteries to store energy unit, which is in, continues charge mode,
As three end failures overcharge mode；When the output power of photovoltaic generation unit is less than the sum of network load rated power, it is
Burning voltage, batteries to store energy unit are in continuous discharge mode, as three end failure over-discharge modes.
Step 3: according to the different operational modes of alternating current-direct current mixing power distribution network, flexible interconnection device, batteries to store energy are adjusted
The control method of system and photovoltaic generation unit.
3-1: adjustment flexible interconnection apparatus control method:
As shown in figure 3,3-1-1: when alternating current-direct current mixing power distribution network works in the normal mode, flexible interconnection device selects automatically
Mode 1 is selected, using the layering sagging control of direct current, control equation is as follows:
One layer of control of the sagging control of direct current is layered in formula (1) corresponding diagram 3,For the reference of DC bus DC voltage
Value, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；idcFor DC bus actual current value；Formula (2) corresponding diagram 3
Two layers of control of the middle layering sagging control of direct current, Δ u are the output valve of two layers of controller, UdcFor DC bus actual voltage value,
kiFor integral coefficient, s is complex variable；
3-1-2: when alternating current-direct current mixing power distribution network exchange side is broken down, the work of alternating current-direct current mixing power distribution network is in single-ended event
Barrier mode, both-end fault mode, both-end failure overcharge mode, both-end failure over-discharge mode, both-end failure current limit mould
Formula, three end fault modes, three end failures overcharge one of mode, three end failure over-discharge modes mode under, therefore
Flexible interconnection device corresponding to barrier side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), remaining flexible interconnection device
Control method does not change, and wherein the control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s
For complex variable；
3-1-3: if the output power of photovoltaic generation unit is less than load power, power grid exchanges side and passes through flexible interconnection device
Input power, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
3-1-4: if the output power of photovoltaic generation unit is greater than load power, DC side will be more by flexible interconnection device
Remaining power output is to side is exchanged, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work in current limliting
Under mode.As shown in figure 3, current-limit mode is mainly on the basis of layering direct current sagging control and two kinds of control methods of constant voltage constant frequency
It is upper to add current limit link, IgmaxAnd IgminFor electric current bound amplitude limit link.
3-2: energy-storage system of accumulator control method:
As shown in figure 4,3-2-1: when alternating current-direct current mixing power distribution network works in the normal mode, if energy-storage system of accumulator work
Make in stand-by mode, energy-storage system of accumulator automatically selects mode 1, by closing to energy-storage system of accumulator inductive current
Ring control realizes that output electric current is zero；
3-2-2: when alternating current-direct current mixing power distribution network works in the normal mode, if energy-storage system of accumulator work is in invariable power
Under charge and discharge mode, energy-storage system of accumulator automatically selects mode 3, carries out closed loop control to energy-storage system of accumulator inductive current
System controls equation to realize invariable power charge and discharge control are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electricity
Stream, power limitation control are controlled under the premise of guaranteeing that accumulator cell charging and discharging power is constant.
3-2-3: when alternating current-direct current mixing power distribution network exchange side is broken down, the work of alternating current-direct current mixing power distribution network is in single-ended event
Barrier mode, both-end fault mode, both-end failure overcharge mode, both-end failure over-discharge mode, both-end failure current limit mould
Formula, three end fault modes, three end failures overcharge one of mode, three end failure over-discharge modes mode under, store
Battery energy storage system automatically selects mode 2, using the layering sagging control of direct current.
3-3: photovoltaic generation unit control method:
As shown in figure 5,3-3-1: when alternating current-direct current mixing power distribution network works in the normal mode, photovoltaic generation unit selects mould
Formula 1, using maximum power point-tracing control method, according to the defeated of the output power P of photovoltaic generation unit and photovoltaic generation unit
The relationship of voltage U is controlled out, controls equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is
The output electric current of photovoltaic cells, whenWhen, output voltage is reduced,Increase output voltage.
3-3-2: when the state-of-charge of energy-storage system of accumulator reaches the upper limit, in order to maintain the perseverance of DC bus-bar voltage
Fixed, photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control.
Advantageous effects of the invention: the alternating current-direct current mixing distribution by building based on current most of field engineerings
Practical cooperative control system is netted, defines and analyzes the various operational modes of alternating current-direct current mixing power distribution network, propose in various fortune
Under row mode, flexible interconnection device, energy-storage system of accumulator and photovoltaic generation unit control method switching method, compare
The control method of traditional alternating current-direct current mixing power distribution network, can further increase the power supply reliability of alternating current-direct current mixing power distribution network.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of 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.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (8)
1. one kind is suitable for alternating current-direct current mixing power distribution network, comprising: three ac bus, a DC bus, it is characterised in that: institute
It states three ac bus sides and is connected separately with breaker, AC load, the other side of breaker passes through route and AC network
It is connected；DC bus side is connected separately with multiple two-way buck-boost converters by route, wherein two-way buck-
The boost converter other end is connected separately with photovoltaic generation unit, and the two-way buck-boost converter other end is connected with electric power storage
Pond energy-storage system, the two-way buck-boost converter other end are connected with load；DC bus side is also connected with directly by route
Current load；The DC bus is connected by the flexible interconnection apparatus module on route respectively with three ac bus.
2. according to claim 1 a kind of suitable for alternating current-direct current mixing power distribution network, it is characterised in that: the two-way buck-
Boost converter quantity is set as four, and the two-way buck-boost converter other end of two of them is connected separately with photovoltaic hair
Electric unit, a two-way buck-boost converter other end are connected with energy-storage system of accumulator, a two-way buck-boost
The converter other end is connected with load.
3. according to claim 1 a kind of suitable for alternating current-direct current mixing power distribution network, it is characterised in that: the DC bus side
A DC load is also connected with by route.
4. a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network according to claim 1-3,
It is characterized in that: including the following steps:
Step 1: whether detection alternating current-direct current mixing power distribution network is in one-end fault mode；The one-end fault mode is only one
It breaks down flexible interconnection device corresponding exchange side in end；If so, step 2 is carried out, if not, detection alternating current-direct current mixing is matched
Whether power grid is in normal mode；The normal mode is that the corresponding exchange side of three end flexible interconnection devices is not broken down；
If so, step 3 is carried out, if not, end step.
Step 2: according to the one-end fault mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), remaining is flexible
The control method of interconnect device does not change, and wherein the control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s is multiple
Variable；
2.2: if the output power of photovoltaic generation unit is less than load power, power grid exchanges side and passes through flexible interconnection device input work
Rate, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side passes through flexible interconnection device for surplus power
Output is to exchange side, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work under current-limit mode.
The current-limit mode is on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus current limit ring
Section, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and photovoltaic
Generator unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；idcFor
DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor integration system
Number, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, by storage
Battery energy storage system inductive current carries out closed-loop control, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mode 3,
Closed-loop control is carried out to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electric current；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to the defeated of photovoltaic generation unit
The relationship of the output voltage U of power P and photovoltaic generation unit is controlled out, controls equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is photovoltaic
The output electric current of unit, whenWhen, output voltage is reduced,Increase output voltage.
5. a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network according to claim 1-3,
It is characterized in that:
Step 1: whether detection alternating current-direct current mixing power distribution network is in both-end fault mode；The both-end fault mode is to work as to have two
It breaks down flexible interconnection device corresponding exchange side in end；If so, step 2 is carried out, if not, detection alternating current-direct current mixing is matched
Whether power grid is in normal mode；The normal mode is that the corresponding exchange side of three end flexible interconnection devices is not broken down；
If so, step 3 is carried out, if not, end step.
Step 2: according to the both-end fault mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), remaining is flexible
The control method of interconnect device does not change, and wherein the control equation of constant voltage constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s is multiple
Variable；
2.2: if the output power of photovoltaic generation unit is less than load power, power grid exchanges side and passes through flexible interconnection device input work
Rate, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side passes through flexible interconnection device for surplus power
Output is to exchange side, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work under current-limit mode.
The current-limit mode is on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus current limit ring
Section, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and photovoltaic
Generator unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；idcFor
DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor integration system
Number, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, by storage
Battery energy storage system inductive current carries out closed-loop control, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mode 3,
Closed-loop control is carried out to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electric current；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to the defeated of photovoltaic generation unit
The relationship of the output voltage U of power P and photovoltaic generation unit is controlled out, controls equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is photovoltaic
The output electric current of unit, whenWhen, output voltage is reduced,Increase output voltage.
6. a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network according to claim 5, it is characterised in that:
The both-end fault mode includes: that both-end failure overcharges mode, both-end failure over-discharge mode, both-end failure current limit mould
Formula；If both-end failure current limit mode is the input or output work that DC side power grid or exchange side power grid pass through flexible interconnection device
When rate reaches the capacity limitation of flexible interconnection device, flexible interconnection device enables current-limit mode；Under both-end failure current limit mode,
Both-end failure over-discharge mode is when photovoltaic generation unit output power is less than network load rated power, in order to stablize electricity
Pressure, batteries to store energy unit continuous discharge；Both-end failure overcharges mode as when the output power of photovoltaic generation unit is greater than
The sum of network load rated power, for burning voltage, batteries to store energy unit, which is in, continues charge mode.
7. a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network according to claim 1-3,
It is characterized in that:
Step 1: whether detection alternating current-direct current mixing power distribution network is in three end fault modes；Three end fault mode is to work as to have three
It breaks down flexible interconnection device corresponding exchange side in end；If so, step 2 is carried out, if not, detection alternating current-direct current mixing is matched
Whether power grid is in normal mode；The normal mode is that the corresponding exchange side of three end flexible interconnection devices is not broken down；
If so, step 3 is carried out, if not, end step.
Step 2: according to three end fault modes of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and
Photovoltaic generation unit is controlled；Specific step is as follows:
2.1: flexible interconnection device corresponding to failure side switches to mode 2, is controlled using constant voltage constant frequency (CVCF), wherein constant pressure
The control equation of constant frequency control is as follows:
Wherein, GPRFor DC bus floating regulation function, kpFor proportionality coefficient, KrFor fundamental frequency gain, w0For angular frequency, s is multiple
Variable；
2.2: if the output power of photovoltaic generation unit is less than load power, power grid exchanges side and passes through flexible interconnection device input work
Rate, when input power reaches the flexible interconnection installed capacity limit, flexible interconnection device will work under current-limit mode；
2.3: if the output power of photovoltaic generation unit is greater than load power, DC side passes through flexible interconnection device for surplus power
Output is to exchange side, and when output power reaches interconnect device capacity limitation, flexible interconnection device will work under current-limit mode.
The current-limit mode is on the basis of being layered the sagging control of direct current and two kinds of control methods of constant voltage constant frequency plus current limit ring
Section, IgmaxAnd IgminFor electric current bound amplitude limit link；
2.4: energy-storage system of accumulator automatically selects mode 2, using the layering sagging control of direct current；
2.5: photovoltaic generation unit switches to the layering sagging control of direct current by MPPT maximum power point tracking control；
Step 3: according to the normal mode of alternating current-direct current mixing power distribution network, to flexible interconnection device, energy-storage system of accumulator and photovoltaic
Generator unit is controlled；Specific step is as follows:
3.1: flexible interconnection device automatically selects mode 1, and using the layering sagging control of direct current, control equation is as follows:
For the reference value of DC bus DC voltage, kpFor virtual impedance, UdcNFor DC bus rated direct voltage；idcFor
DC bus actual current value；Δ u is the output valve of two layers of controller, UdcFor DC bus actual voltage value, kiFor integration system
Number, s is complex variable；
3.2: if energy-storage system of accumulator work is in stand-by mode, energy-storage system of accumulator automatically selects mode 1, by storage
Battery energy storage system inductive current carries out closed-loop control, realizes that output electric current is zero；
3.3: if energy-storage system of accumulator work is under invariable power charge and discharge mode, energy-storage system of accumulator automatically selects mode 3,
Closed-loop control is carried out to energy-storage system of accumulator inductive current, to realize invariable power charge and discharge control, controls equation are as follows:
In formula (4)For accumulator cell charging and discharging power, VbFor accumulator cell charging and discharging end voltage,For accumulator cell charging and discharging electric current；
3.4: photovoltaic generation unit selects mode 1, using maximum power point-tracing control method, according to the defeated of photovoltaic generation unit
The relationship of the output voltage U of power P and photovoltaic generation unit is controlled out, controls equation are as follows:
P=UI (5)
Both sides carry out differential to U simultaneously and obtain:
P is the output power of photovoltaic generation unit in formula (5) and formula (6), and U is the output voltage of photovoltaic generation unit, and I is photovoltaic
The output electric current of unit, whenWhen, output voltage is reduced,Increase output voltage.
8. a kind of cooperative control method suitable for alternating current-direct current mixing power distribution network according to claim 7, it is characterised in that:
Three end fault mode includes: that three end failures overcharge mode, three end failure over-discharge modes；Three end failures are excessively filled
Power mode is when the output power of photovoltaic generation unit is greater than the sum of network load rated power, for burning voltage, battery
Energy-storage units, which are in, continues charge mode；Three end failure over-discharge modes are when the output power of photovoltaic generation unit is less than net
The sum of network load rating power, for burning voltage, batteries to store energy unit is in continuous discharge mode.
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