CN113541212B - Customized power system oriented to AC/DC hybrid power supply mode and control method thereof - Google Patents
Customized power system oriented to AC/DC hybrid power supply mode and control method thereof Download PDFInfo
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- CN113541212B CN113541212B CN202110800843.XA CN202110800843A CN113541212B CN 113541212 B CN113541212 B CN 113541212B CN 202110800843 A CN202110800843 A CN 202110800843A CN 113541212 B CN113541212 B CN 113541212B
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a customized power system oriented to an alternating current-direct current hybrid power supply mode and a control method thereof, wherein the system comprises a first direct current bus segment, a second direct current bus segment and a third direct current bus segment; and a first ac busbar segment, a second ac busbar segment, and a third ac busbar segment; the alternating current bus segments are powered by the corresponding alternating current power supply units, and the alternating current bus segments supply power to the corresponding direct current bus segments through the converters; the system further comprises a first type direct current/alternating current load, a second type direct current/alternating current load and a third type direct current/alternating current load which are sequentially reduced in sensitivity degree to voltage continuity, wherein a fast switch is arranged between two power supply units for supplying power to the first alternating current bus section and supplying power to the second alternating current bus section, and the fast switch starts switching when any one of the two power supply units is in sag, so that comprehensive management of electric energy quality and continuous power supply capability guarantee in an alternating current/direct current hybrid power supply mode are realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a customized power system oriented to an alternating current-direct current hybrid power supply mode and a control method thereof.
Background
The quality of electric energy is not only related to the safe and economic operation of power grid enterprises, but also affects the safe operation and product quality of users, and along with the development of modern science and technology, the requirements of electric power users on the quality of electric energy are continuously improved. The customized power technology is to integrate the high-power electronic technology and the distribution automation technology by applying the modern power electronic and control technology, and to configure the required power for the user based on the requirements of the user on the power reliability and the power quality.
In the power utilization terminal, the dc power supply mode is more and more widely used because of the configuration of better receiving renewable electric energy access and energy storage of wind power, photovoltaic and the like and higher power supply efficiency, and the ac-dc hybrid power supply mode is also becoming a more efficient and energy-saving power supply mode. The traditional customized power technology aims at alternating current power supply, aims at improving the quality of alternating current power supply, and along with the rising of alternating current-direct current hybrid power supply modes, the mode of differential customization on alternating current and direct current sides is also urgently needed.
Disclosure of Invention
The embodiment of the invention provides a customized power system oriented to an alternating current-direct current hybrid power supply mode and a control method thereof, so as to realize the management of the power quality and the continuous power supply capability guarantee of the power supply mode with differentiated loads on an alternating current side and a direct current side in the alternating current-direct current hybrid power supply mode.
In a first aspect, an embodiment of the present invention provides a customized power system for an ac/dc hybrid power supply, including:
a direct current bus and an alternating current bus; the direct current bus comprises a first direct current bus section, a second direct current bus section and a third direct current bus section; the alternating current bus comprises a first alternating current bus segment, a second alternating current bus segment and a third alternating current bus segment; the first direct current bus segment is connected with the first alternating current bus segment through a first current transformer, the second direct current bus segment is connected with the second alternating current bus segment through a second current transformer, and the third direct current bus segment is connected with the third alternating current bus segment through a third current transformer; the first converter, the second converter and the third converter are used for rectifying alternating current on the alternating current bus into direct current and providing the direct current to the direct current bus, or inverting a power supply at the direct current side into alternating current to be provided for the alternating current bus when alternating current power supply is interrupted;
The power supply unit comprises a first alternating current power supply unit, a second alternating current power supply unit and a third alternating current power supply unit, wherein the first alternating current power supply unit is connected with the first direct current bus segment, the second alternating current power supply unit is connected with the second direct current bus segment, and the third alternating current power supply unit is connected with the third direct current bus segment; the fast change-over switch is arranged between the first alternating current power supply unit and the second alternating current power supply unit, and the switch is started when the first alternating current power supply unit or the second alternating current power supply unit is temporarily started;
an ac load unit and a dc load unit; the direct current load unit comprises a first type direct current load, a second type direct current load and a third type direct current load, wherein the sensitivity degree to voltage continuity is reduced in sequence; the alternating current load unit comprises a first type alternating current load, a second type alternating current load and a third type alternating current load, wherein the sensitivity degree of the first type alternating current load, the second type alternating current load and the third type alternating current load to the power supply continuity is reduced in sequence; the first type of direct current load, the second type of direct current load and the third type of direct current load are respectively connected with the first direct current bus segment, the second direct current bus segment and the third direct current bus segment in a one-to-one correspondence manner; the first type of alternating current load, the second type of alternating current load and the third type of alternating current load are respectively connected with the first alternating current bus segment, the second alternating current bus segment and the third alternating current bus segment in a one-to-one correspondence manner.
Optionally, the power supply unit further includes:
the hybrid energy storage unit is connected with the first direct current bus section; the hybrid energy storage unit is used for supplying power to the first direct current bus section when the first alternating current power supply unit is in a sag;
the hybrid energy storage unit comprises a storage battery and a first superconducting energy storage subunit, wherein the storage battery is used for charging for standby discharging when the system is in normal operation, and the first superconducting energy storage subunit is used for stabilizing the direct-current voltage on the first direct-current bus segment and eliminating direct-current ripple, and performing transient high-current compensation when the storage battery is put into operation so as to reduce the impact of the storage battery and prolong the service life of the storage battery;
the second dc bus segment is further electrically connected to a second superconducting energy storage subunit for stabilizing a dc voltage on the second dc bus segment and for eliminating dc ripple.
Optionally, the power supply unit further includes:
the power supply system comprises a first alternating current bus segment, a second alternating current bus segment, a first direct current bus segment and a second direct current bus segment, wherein the first alternating current bus segment is connected with the first alternating current power supply unit, the second alternating current power supply unit is connected with the second alternating current power supply unit, and the power supply unit is connected with the first direct current bus segment;
A first bus tie switch is arranged between the first alternating current bus segment and the second alternating current bus segment, and the first bus tie switch is used for closing the first alternating current bus segment and the second alternating current bus segment when the generator set supplies power to the alternating current bus.
Optionally, a second bus tie switch is arranged between the first direct current bus segment and the second direct current bus segment; the second bus tie switch is used for closing the first direct current bus segment and the second direct current bus segment after the first converter fails, so that the second direct current bus segment supplies power to the first direct current bus segment; or after the second converter fails, closing the first direct current bus segment and the second direct current bus segment so that the first direct current bus segment supplies power to the second direct current bus segment;
the hybrid energy storage unit is also used for supplying power to the first direct current bus segment after the first converter fails and before the second bus tie switch is closed.
Optionally, the power supply unit further comprises a photovoltaic power supply unit and/or a fan power supply unit; the photovoltaic power supply unit and/or the fan power supply unit are electrically connected with the third direct current bus segment;
A third bus tie switch is arranged between the third alternating current bus segment and the second alternating current bus segment; the third bus tie switch is used for closing the third alternating current bus segment and the second alternating current bus segment when the power supply interruption occurs to the first alternating current power supply unit and the second alternating current power supply unit, the energy storage of the first direct current bus segment and the second direct current bus segment is released, and the residual fuel of the diesel generator set is smaller than a second preset value, so that the third alternating current bus segment supplies power to all loads;
a fourth bus tie switch is arranged between the third direct current bus segment and the second direct current bus segment; and the fourth bus tie switch is used for closing the third direct current bus segment and the second direct current bus segment when the power supply amount of the photovoltaic power supply unit and/or the fan power supply unit to the third direct current bus segment is larger than the consumption amount of the third direct current load to wind and/or light energy sources, so that the photovoltaic power supply unit and/or the fan power supply unit can supply power to the second direct current bus segment and the first direct current bus segment.
Optionally, the first type of direct current load is connected in series with a superconducting current limiter, and the superconducting current limiter is used for limiting current flowing to the first type of direct current load when a ground short circuit fault occurs, so that the load is ensured to continuously run without tripping;
The second type of alternating current load comprises harmonic sensitive loads and sag sensitive loads; the harmonic sensitive load is connected in parallel with an active filter, and the active filter is used for filtering the voltage supplied to the harmonic sensitive load; the sag sensitive load is connected in series with a dynamic voltage restorer so as to cope with the influence of voltage sag or load impact on the sag sensitive load.
In a second aspect, an embodiment of the present invention provides a method for controlling a customized power system, where the method is used for controlling any one of the customized power systems facing to an ac/dc hybrid power supply manner in the first aspect, and includes:
when the first alternating current power supply unit, the second alternating current power supply unit and the third alternating current power supply unit are in a normal power supply state, controlling the first converter to rectify alternating current on the first alternating current bus segment into direct current and provide the direct current for the first direct current bus segment, controlling the second converter to rectify alternating current on the second alternating current bus segment into direct current and provide the direct current for the second direct current bus segment, and controlling the third converter to rectify alternating current on the third alternating current bus segment into direct current and provide the direct current for the third direct current bus segment;
and if the first alternating current power supply unit or the second alternating current power supply unit is in a sag, controlling the quick change-over switch to switch so as to enable the second alternating current power supply unit to supply power to the first alternating current bus section or enable the first alternating current power supply unit to supply power to the second alternating current bus section.
Optionally, the first dc bus section is further connected to a hybrid energy storage unit; after the first ac power unit is temporarily dropped, the method further comprises:
controlling the hybrid energy storage unit to supply power to the first direct current bus segment, and controlling the first converter to invert direct current on the first direct current bus segment into alternating current so as to supply the alternating current to the first alternating current bus segment;
judging whether the difference value between the duration time of the sag of the first alternating current power supply unit and the half time supportable by the hybrid energy storage unit is smaller than a preset range, if so, controlling the quick change-over switch to start switching, and externally supplying power to the first direct current bus segment by the first alternating current power supply unit.
Optionally, the power supply unit further comprises a generator set, and the generator set is electrically connected with the second alternating current bus segment; after the first ac power supply unit has a dip or a power interruption, the method further comprises:
if the second alternating current power supply unit is also subjected to sag or the control of the quick change-over switch to start and switch failure, and the residual electric quantity of the storage battery connected to the first direct current bus is smaller than a first preset value, the control of starting the generator set connected to the second alternating current bus segment is performed, and the control of closing of the first bus tie switch connected between the first alternating current bus segment and the second alternating current bus segment is performed, so that the generator set supplies power to the first alternating current bus segment and the second alternating current bus segment.
Optionally, the method further comprises:
if the first converter fails, controlling a second bus tie switch connected between the first direct current bus segment and the second direct current bus segment to be switched from an open state to a closed state so that the second direct current bus segment supplies power to the first direct current bus segment; and controlling a hybrid energy storage unit to provide power support to the first dc bus segment during the second bus tie switch switching state.
The embodiment of the invention provides a customized power system oriented to an alternating current-direct current hybrid power supply mode and a control method thereof, wherein the customized power system comprises a first direct current bus segment, a second direct current bus segment, a third direct current bus segment, a first alternating current bus segment, a second alternating current bus segment and a third alternating current bus segment; the alternating current bus segments are powered by the corresponding alternating current power supply units, and the alternating current bus segments supply power to the corresponding direct current bus segments through the converters; the system also comprises a first type of direct current/alternating current load, a second type of direct current/alternating current load and a third type of direct current/alternating current load, wherein the sensitivity degree to voltage continuity is reduced in sequence; the fast change-over switch is arranged between the two power supply units for supplying power to the first alternating current bus section and the second alternating current bus section, and the switch is started when any one of the two power supply units is temporarily started. According to the embodiment of the invention, the converter is arranged between the alternating current bus and the direct current bus, so that the alternating current power supply unit can supply power to both a direct current load and an alternating current load in a system during normal operation, or the power supply on the direct current side is inverted into alternating current power to supply the alternating current load during interruption of alternating current power supply; and a quick change-over switch is arranged between the alternating current power supply units of the two paths of lines with higher sensitivity to voltage continuity, if the first alternating current power supply unit or the second alternating current power supply unit is in dip, the quick change-over switch is controlled to switch so as to enable the second alternating current power supply unit to supply power to the first alternating current bus section or enable the first alternating current power supply unit to supply power to the second alternating current bus section, the quick change-over switch and the converter realize the guarantee of the power quality of alternating current power supply and the guarantee of the power quality of direct current power supply, and therefore the management of the power quality and the continuous power supply capability guarantee of the power supply mode with differentiated loads on the alternating current side are realized in an alternating current and direct current mixed power supply mode.
Drawings
Fig. 1 is a schematic structural diagram of a customized power system facing an ac/dc hybrid power supply manner according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a customized power system according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides a customized power system facing an ac/dc hybrid power supply mode, and fig. 1 is a schematic structural diagram of the customized power system facing the ac/dc hybrid power supply mode provided by the embodiment of the invention, and referring to fig. 1, the customized power system includes:
a direct current bus and an alternating current bus; the dc bus comprises a first dc bus section 21, a second dc bus section 22 and a third dc bus section 23; the ac bus comprises a first ac bus segment 11, a second ac bus segment 12 and a third ac bus segment 13; wherein the first dc bus segment 21 is connected to the first ac bus segment 11 by a first current transformer 112, the second dc bus segment 22 is connected to the second ac bus segment 12 by a second current transformer 122, and the third dc bus segment 23 is connected to the third ac bus segment 13 by a third current transformer 132; the first converter 112, the second converter 122, and the third converter 132 are used for rectifying the AC power on the AC bus to DC power and supplying the DC power to the DC bus, or inverting the DC-side power to AC power to supply the AC load when the AC power supply is interrupted (the first converter 112, the second converter 122, and the third converter 132 are AC/DC converters).
The power supply unit comprises a first alternating current power supply unit A1, a second alternating current power supply unit A2 and a third alternating current power supply unit A3, wherein the first alternating current power supply unit A1 is connected with the first direct current bus section 21, the second alternating current power supply unit A2 is connected with the second direct current bus section 22, and the third alternating current power supply unit A3 is connected with the third direct current bus section 23; the fast switching switch SSTS is arranged between the first alternating current power supply unit A1 and the second alternating current power supply unit A2, and switching is started when the first alternating current power supply unit A1 or the second alternating current power supply unit A2 is temporarily started;
an ac load unit and a dc load unit; the dc load unit includes a first type dc load 211, a second type dc load 221, and a third type dc load 231, which have sequentially reduced sensitivity to voltage continuity; the alternating current load unit comprises a first type alternating current load 111, a second type alternating current load 121 and a third type alternating current load 131, wherein the sensitivity degree to power supply continuity is sequentially reduced; the first type of direct current load 211, the second type of direct current load 221 and the third type of direct current load 231 are respectively connected with the first direct current bus section 21, the second direct current bus section 22 and the third direct current bus section 23 in a one-to-one correspondence manner; the first type ac load 111, the second type ac load 121, and the third type ac load 131 are respectively connected to the first ac bus section 11, the second ac bus section 12, and the third ac bus section 13 in a one-to-one correspondence.
Specifically, the first ac power supply unit A1, the second ac power supply unit A2, and the third ac power supply unit A3 included in the power supply unit may be external power supply lines for supplying power to the user from the power grid. The load of the alternating current motor and the like adopting alternating current power supply is divided into three grades according to the high-quality power supply degree, and the three grades are connected to three sections of alternating current bus segments of the alternating current power supply. The load adopting direct current power supply such as a frequency conversion device of a cancel switching power supply is divided into three grades according to the high-quality power supply degree, and is connected to three sections of direct current buses of direct current power supply, such as a computer, 220V alternating current is provided during conventional alternating current power supply, the direct current is firstly changed into direct current through the switching power supply, then the direct current is inverted into alternating current with controllable frequency to supply power to a main board, a CPU (Central processing unit) and a display card, and the direct current load is obtained after the switching power supply is canceled.
The dc load unit and the ac load unit may be classified into L1 to L3 stages according to the degree of sensitivity to voltage continuity. The first type ac load 111 and the first type dc load 211 correspond to L1 class loads; the second type ac load 121 and the second type dc load 221 correspond to L2-stage loads; the third type ac load 131 and the third type dc load 231 correspond to L3 class loads. The L1-level load is the load with the highest requirement on power supply continuity, and mainly comprises temperature control or fire control load of important industrial process equipment, and once power supply interruption occurs, a large amount of products are scrapped or serious safety accidents are generated; the L2-level load is a common sensitive load, cannot bear voltage sag or power interruption for a long time, and has certain pollution to a power grid or cannot bear power quality disturbance caused by the power grid. That is, class L2 loads may inject harmonics into the grid, thus requiring remediation; or the work of the power grid can be influenced when the power grid has harmonic waves, so that the harmonic wave influence of the power grid needs to be prevented; or the impact is generated by the self-body frequently, so that the treatment is needed; or the user is influenced by the fact that the user is flashed into the power grid reclosing and lightning strikes to the tower, so that custom equipment needs to be configured for prevention. The ac loads in the L2 stage load can be divided into a harmonic sensitive load 1211 and a sag sensitive load 1212. The harmonic sensitive load 1211 may be connected in parallel with an active filter 1213, filtering out the device injection system harmonic through the active filter 1213 and suppressing the effect of external harmonics on the harmonic sensitive load. A dip sensitive load 1212 may be connected in series with a dynamic voltage restorer 1214 to handle the effects of voltage dips or load shocks. The L3-level load is a general load and can bear the dip or power failure of an external power supply line.
A load switch may also be provided between each load busbar. As shown in fig. 1, the first ac load 111 and the first ac bus segment 11 are directly provided with a switch K 11 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the harmonic sensitive load 1211 and the second alternating current bus section 12 12 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the sag sensitive load 1212 and the second alternating current bus section 12 13 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the third type of alternating current load 131 and the third alternating current bus section 13 15 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the first type DC load 211 and the first DC bus section 21 21 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the second type DC load 221 and the second DC bus section 22 22 The method comprises the steps of carrying out a first treatment on the surface of the A switch K is arranged between the third class DC load 231 and the third DC bus section 23 23 。
In the external power supply mode, three paths of power supplies are adopted to supply power to three types of loads respectively. Wherein a three-switch solid state fast switch SSTS is arranged at the two-way inlet of the first alternating current power supply unit A1 and the second alternating current power supply unit A2. The first ac power supply unit A1 supplies power to the first ac bus segment 11 after the switch S1 in the line switch 201 and the solid state fast switching switch SSTS is closed. The second current supply unit A2 supplies power to the second ac bus segment 12 after the switch S2 in the line switch 202 and the solid state fast changeover switch SSTS is closed. The third ac power supply unit A3 supplies power to the first ac bus segment after the line switch 203 is closed. When the voltage sag occurs in the first alternating current power supply unit A1, the fast switching switch SSTS can be switched fast (the switch S2 is closed), the second alternating current power supply unit A2 supplies power to the first direct current bus section 21, and when the sag disappears, the first alternating current power supply unit A1 is switched back; when the voltage sag occurs in the first ac power supply unit A1, the fast switch SSTS may be switched fast (the switch S2 is closed), and the first ac power supply unit A1 supplies power to the second dc bus section 22, and when the sag disappears, the second ac power supply unit A2 is switched back.
In the customized power system facing the alternating current-direct current hybrid power supply mode provided by the embodiment of the invention, when the alternating current power supply units are in normal power supply states, the converter is controlled to rectify alternating current on the alternating current bus segment into direct current and provide the direct current bus segment, and if the first alternating current power supply unit or the second alternating current power supply unit has dip, the fast switch is controlled to switch so as to enable the second alternating current power supply unit to supply power to the first alternating current bus segment or enable the first alternating current power supply unit to supply power to the second alternating current bus segment. The fast change-over switch and the converter realize the power quality control of alternating current power supply, and can also control the power quality of direct current power supply, thereby realizing the control of the power quality of the power supply mode with differentiated loads on the alternating current and direct current sides in the alternating current and direct current mixed power supply mode.
Optionally, please continue to refer to fig. 1, the power supply unit further includes:
a hybrid energy storage unit 30, the hybrid energy storage unit 30 being connected to the first dc bus section 21; the hybrid energy storage unit 30 is used for supplying power to the first direct current bus segment 21 when the first alternating current power supply unit A1 is in a sag;
the hybrid energy storage unit 30 comprises a storage battery 31 and a first superconducting energy storage subunit 32, wherein the storage battery 31 is used for charging for standby discharging when the system is in normal operation, the first superconducting energy storage subunit 32 is used for stabilizing the direct-current voltage on the first direct-current bus section 21 and eliminating direct-current ripple, and transient high-current compensation is carried out when the storage battery 31 is put into operation so as to reduce the impact of the storage battery and prolong the service life of the storage battery;
The second dc bus section 22 is also electrically connected to a second superconducting energy storage subunit 70, the second superconducting energy storage subunit 70 being configured to stabilize the dc voltage on the second dc bus section 22 and to eliminate dc ripple.
Specifically, the first type AC load 111 with the highest requirement for power supply continuity is connected to the first AC bus segment 11, and when a sag or interruption occurs in the external power supply line of the first AC power supply unit A1, the first converter 112 (the first converter is an AC/DC converter) connected to the same bus is changed from the rectifying state to the inverting state. The hybrid energy storage unit 30, which is a combination of the storage battery 31 and the superconducting energy storage, starts discharging, and the alternating current is generated by inversion of the first converter to be supplied to the first type alternating current load 111 for operation. The first converter 112 is in a rectifying state in a conventional manner, is in an inverting state when the storage battery 31 supplies power to the first type ac load 111, and can also realize short-time voltage compensation through reactive power control when the ac bus fluctuates, thereby functioning as a static reactive power compensator. The second converter 122 is conventionally in a rectifying state, and short-time voltage compensation can be realized through reactive power control when the voltage of the second ac bus segment 12 needs to be regulated, so that the second converter functions as a static reactive power compensator.
If the duration of the dip or interruption of the power supply of the first ac power supply unit A1 is close to about half the supportable power supply time of the hybrid energy storage unit 30, the fast switch SSTS is controlled to start switching, and the second ac power supply unit A2 supplies the external power. The first ac power supply unit A1 may externally supply power to the first dc bus section 21 by determining whether the difference between the duration of the occurrence of the sag of the first ac power supply unit A1 and the half of the supportable time of the hybrid energy storage unit 30 is smaller than a preset range, and if so, controlling the fast changeover switch SSTS to start the changeover. The hybrid energy storage unit 30 can provide a buffer time for the first ac power supply unit A1 to resume normal operation, and can also avoid the situation that the fast switch SSTS is switched immediately as soon as the first ac power supply unit A1 has a dip or power interruption, so that the frequency of switching the fast switch SSTS between the first ac power supply unit A1 and the second ac power supply unit A2 can be reduced, and the service life of the fast switch SSTS is ensured.
In addition, the hybrid energy storage unit 30 is a modified UPS (uninterruptible power supply) comprising a storage battery 31 and a first superconducting energy storage subunit 32. When the customized power system is operating normally, the storage battery 31 is fully charged to enter a floating charge and standby discharge mode; the first superconducting energy storage subunit 32 functions to stabilize the voltage of the first dc bus section 21 and reduce voltage ripple by timely adjustment of rapid charge and discharge, similar to the DVR (dynamic voltage restorer 1214) and APF (active filter 1213) of dc. When the storage battery 31 needs to be rapidly put into operation to ensure no power failure, the first superconducting energy storage subunit 32 provides instantaneous high current at the initial stage of discharging, so that the discharging power of the storage battery 31 is gradually increased to be balanced with the load, and the protection effect on the battery is achieved. The second dc bus section 22 is also electrically connected to a second superconducting energy storage subunit 70, the second superconducting energy storage subunit 70 being adapted to stabilize the dc voltage on the second dc bus section 22. A DC/DC converter may also be provided between the hybrid energy storage unit 30 and the DC bus, and between the second superconducting energy storage subunit 70 and the DC bus.
Optionally, please continue to refer to fig. 1, the power supply unit further includes:
the generator set 40 is electrically connected with the second ac bus segment 12, and the generator set 40 is configured to supply power to the first ac bus segment, the second ac bus segment, the first dc bus segment and the second dc bus segment when power interruption or sag occurs in both the first ac power supply unit A1 and the second ac power supply unit A2 and the remaining power of the storage battery connected to the first dc bus is less than a first preset value;
a first bus tie switch is arranged between the first ac bus segment 11 and the second ac bus segment 12, and the first bus tie switch S1 is used to close the first ac bus segment 11 and the second ac bus segment 12 when the generator set 40 supplies power to the ac bus.
Specifically, the first ac load 111 with the highest requirement for power supply continuity is connected to the first ac bus segment 11, and when a sag or interruption occurs in the external power supply line of the first ac power supply unit A1, the first converter connected to the same bus is changed from the rectifying state to the inverting state. Accumulator 31The hybrid energy storage unit 30, which is a combination of superconducting energy storage, starts discharging and is inverted by the first converter to generate ac power to supply the ac load 111 of the first type. If the duration of the dip or interruption of the power supply of the first ac power supply unit A1 is close to about half the supportable power supply time of the hybrid energy storage unit 30, the fast switch SSTS starts the switching, and the second ac power supply unit A2 supplies the external power. If the second ac power supply unit A2 is likewise interrupted or the switching of the fast changeover switch SSTS is unsuccessful, the generator set 40 on the ac bus is started, and before the hybrid energy storage unit 30 is discharged, the power is supplied to the first dc bus section 21 and the second dc bus section 22 by the generator set 40. The generator set 40 may be disposed on the second ac bus segment 12, and a first bus tie switch S1 is disposed between the first ac bus segment 11 and the second ac bus segment 12, where the first bus tie switch S1 is used to close the first ac bus segment 11 and the second ac bus segment 12 when the generator set 40 supplies power to the ac bus. The normal operation of the customized power system can be further ensured through the generator set 40, the treatment of the electric energy quality is realized, and a switch K can be arranged between the generator set 40 and the alternating current bus 14 。
Optionally, a second busbar tie switch is arranged between the first direct current busbar section 21 and the second direct current busbar section 22; the second busbar tie switch S2 is configured to close the first dc busbar section 21 and the second dc busbar section 22 after the first converter 112 fails, so that the second dc busbar section 22 supplies power to the first dc busbar section 21; or after the second converter 122 fails, closing the first dc bus section 21 and the second dc bus section 22 so that the first dc bus section 21 supplies power to the second dc bus section 22;
the hybrid energy storage unit 30 is also used to supply power to the first dc bus section 21 after a fault in the first converter 112 and before the second bus tie switch is closed.
Specifically, the first converter 112 and the second converter 122 are standby devices, and function to supply power to the first type dc load 211 and the second type dc load 221. If the first converter 112 fails, the second bus tie switch S2 connected between the first dc bus section 21 and the second dc bus section 22 is controlled to switch from the open state to the closed state, so that the second converter 122 supplies power to the first dc bus section 21; and during the second bus tie switch switching state, the hybrid energy storage unit 30 may provide voltage support to the first dc bus section 21. If the second converter 122 fails, the second busbar tie switch S2 connected between the first and second dc busbar sections 21 and 22 can likewise be controlled from the open state to the closed state, so that the first converter 112 supplies power to the second dc busbar section 22. The first dc bus section 21 and the second dc bus section 22 are in communication for a very short time, since the dc bus connections are free of transient impacts caused by phase differences. While the second type dc load 221 can withstand extremely short-time interruption during the switching of the open/close state of the second bus tie switch S2, so that the voltage support of the battery 31 can be eliminated; and the storage battery 31 has high cost and limited configuration capacity, and is only used for standby of the first type of direct current load 211.
The first type of dc load 211 with the highest requirement on the power supply continuity is connected to the first dc bus segment 21, and dc power is normally provided by the first converter in a rectifying mode, so as to prevent the load switch K21 connected between the first type of dc load 211 and the first dc bus segment 21 from tripping due to overcurrent when a single-phase ground short circuit fault occurs in the first type of dc load 211, and a superconducting current limiter 212 is connected in series to a branch of the first type of dc load 211. The superconducting current limiter 212 is used for current limiting, so that the first type direct current load 211 can normally operate when a single-phase-to-ground short circuit fault occurs. The battery 31, the superconducting energy storage and the superconducting current limiter 212 realize the power quality control of direct current power supply.
In summary, in the customized power system for an ac/dc hybrid power supply mode disclosed in the embodiment of the present invention, a fast switch is provided between two power supply units for supplying power to a first ac bus segment and supplying power to a second ac bus segment, and when any one of the two power supply units has a sag, switching is started; the superconducting-battery hybrid energy storage arranged on the first direct current bus starts to be switched into the most important load on the first alternating current/direct current bus to supply power uninterruptedly when the first alternating current/direct current bus is in dip or short-time power supply interruption, wherein the superconducting energy storage provides transient power type fast compensation, and the battery energy storage provides energy compensation to form complementation; the first direct current bus is connected to the first direct current load in series and connected to the superconducting current limiter to ensure that the current is not too large to cause tripping when the load is short-circuited; an active filter arranged on the second alternating current bus is used for filtering out when the harmonic source injects harmonic; the second alternating current bus is connected to the sag sensitive load, connected in series to the dynamic voltage recovery device and matched with an external quick change-over switch to treat the voltage sag; the second alternating current bus is provided with a permanent benefit of the generator set for long-time external power supply interruption; the second direct current bus is provided with a superconducting energy storage for controlling direct current ripple and direct current voltage fluctuation; the configuration realizes the comprehensive treatment of the electric energy quality in an alternating current-direct current hybrid power supply mode.
Optionally, the power supply unit further includes a photovoltaic power supply unit 50 and/or a fan power supply unit 60; the photovoltaic power supply unit 50 and/or the fan power supply unit 60 are electrically connected with the third dc bus section 23;
a third busbar tie switch S3 is arranged between the third alternating current busbar section 13 and the second alternating current busbar section 12; the third bus tie switch S3 is configured to close the third ac bus segment 11 and the second ac bus segment 12 when the power supply of the first ac power supply unit A1 and the second ac power supply unit A2 is interrupted, the energy storage of the first dc bus segment 21 and the energy storage of the second dc bus segment 22 are released, and the remaining fuel of the diesel generator set 40 is less than a second preset value, so that the third ac bus segment 13 supplies power to all loads;
a fourth busbar tie switch is arranged between the third direct current busbar section 23 and the second direct current busbar section 22; the fourth bus tie switch is used for closing the third dc bus section 23 and the second dc bus section 22 when the power supply amount of the photovoltaic power supply unit 50 and/or the fan power supply unit 60 to the third dc bus section 23 is greater than the consumption amount of the wind and/or the light energy source by the third dc load, so that the photovoltaic power supply unit 50 and/or the fan power supply unit 60 supplies power to the second dc bus section 22 and the first dc bus section 21.
Specifically, the distributed wind and light is connected in a direct current mode, and is consumed by the third type of direct current load 231 in normal operation, so that the utilization efficiency is improved. A DC/DC converter is provided between the photovoltaic power supply unit 50 and the DC bus, and a DC/AC converter is provided between the fan power supply unit 60 and the DC bus. The third type of dc load 231 may be configured to be partially supplied with power from the distributed renewable energy source, and may be supplied with power from the external power supply line through rectification of the third converter 132 when the power is insufficient. Or a part of the energy is from an external power supply circuit, and the energy can be from the supply of distributed renewable energy sources when the energy is insufficient. Or both the power supply of the external power supply line and the distributed renewable energy source. When the load L3 on the third section of direct current bus is insufficient to consume the wind-solar clean energy, the second type of direct current load 221 and the first type of direct current load 211 can be consumed through the closed loop of the three sections of direct current bus sections. When the three external power supplies are interrupted, the photovoltaic power supply unit 50 and/or the fan power supply unit 60 can assist the storage battery 31 to prolong the uninterrupted power supply time; the photovoltaic power supply unit 50 and/or the fan power supply unit 60 can also cooperate with the hybrid energy storage unit 30 to play a role in regulation when the generator is in emergency power supply, so as to realize the maximized high-efficiency energy consumption of renewable energy sources. The photovoltaic power supply unit 50 and/or the fan power supply unit 60 are connected to the dc bus, and directly consume the generated electric energy through the dc load, or charge the storage battery 31 and the superconducting energy storage (the first superconducting energy storage unit 32 and the second superconducting energy storage subunit 70) through the conversion of the operation mode, so that the electric energy is consumed by the dc load as much as possible, and the efficiency of the renewable energy consumption is improved. The third converter 132 may be provided with an inversion state, and the third type ac load 131 may be supplied with ac power from an excessive renewable energy source.
The customized power system provided by the embodiment of the invention is subjected to alternating current-direct current side differential customization and targeted power quality control in an alternating current-direct current hybrid power supply mode. DVR, active filtering, fast change-over switch and AC/DC converter realize the electric energy quality control of AC power supply; the storage battery, the superconducting energy storage, the superconducting current limiter, the fast change-over switch and the AC/DC converter realize the electric energy quality control of direct current power supply. The superconducting current limiter ensures that the first type of direct current load can run uninterruptedly under single-phase ground fault; the superconducting energy storage plays a role in eliminating voltage ripple of the direct current bus; the superconducting energy storage and the battery energy storage form a hybrid energy storage unit, and when the hybrid energy storage unit is put into operation, the superconducting energy storage provides initial large current, so that the gradual output power of the battery is ensured, and the service life of the battery is prolonged. The topology of the current transformer determines that the current transformer has the four-quadrant operation capability, and the current transformer can have the capability of rapidly sending/absorbing reactive power to support the voltage of the alternating current bus by utilizing the function. The discrete wind power is rectified through the direct-driven motor, the distributed photovoltaic is connected to the direct-current voltage bus after direct-current conversion, and the direct-current load is directly consumed, or the storage battery and the superconducting energy storage are charged through conversion of an operation mode, so that the direct-current motor is consumed by the direct-current load as much as possible, and the efficiency of renewable energy consumption is improved.
The embodiment of the invention also provides a control method of a customized power system, which is used for controlling the customized power system facing the ac/dc hybrid power supply mode in any embodiment, and fig. 2 is a flowchart of a control method of a customized power system provided by the embodiment of the invention, and referring to fig. 2, the method includes:
s110, when the first alternating current power supply unit, the second alternating current power supply unit and the third alternating current power supply unit are in a normal power supply state, controlling the first converter to rectify alternating current on the first alternating current bus segment into direct current and provide the direct current for the first direct current bus segment, controlling the second converter to rectify alternating current on the second alternating current bus segment into direct current and provide the direct current for the second direct current bus segment, and controlling the third converter to rectify alternating current on the third alternating current bus segment into direct current and provide the direct current for the third direct current bus segment.
And S120, if the first alternating current power supply unit or the second alternating current power supply unit is in a sag, controlling the quick change switch to switch so as to enable the second alternating current power supply unit to supply power to the first alternating current bus section or enable the first alternating current power supply unit to supply power to the second alternating current bus section.
Optionally, the first dc bus section is further connected to a hybrid energy storage unit; after the first ac power unit is temporarily dropped, the method further includes:
controlling a hybrid energy storage unit to supply power to the first direct current bus segment, and controlling a first converter to invert direct current on the first direct current bus segment into alternating current so as to supply the alternating current to the first alternating current bus segment;
judging whether the difference value between the duration time of the sag of the first alternating current power supply unit and the half time supportable by the hybrid energy storage unit is smaller than a preset range, if so, controlling the quick change-over switch to start switching, and externally supplying power to the first direct current bus segment by the first alternating current power supply unit.
Optionally, the power supply unit further comprises a generator set, and the generator set is electrically connected with the second alternating current bus segment; after the first ac power unit experiences a dip or power interruption, the method further includes:
if the second alternating current power supply unit is also subjected to sag or the control of the quick change-over switch to start and switch failure, and the residual electric quantity of the storage battery connected to the first direct current bus is smaller than a first preset value, the control of starting the generator set connected to the second alternating current bus segment is performed, and the control of closing of the first bus tie switch connected between the first alternating current bus segment and the second alternating current bus segment is performed, so that the generator set supplies power to the first alternating current bus segment and the second alternating current bus segment.
Optionally, the method further comprises:
if the first converter fails, controlling a second bus tie switch connected between the first direct current bus segment and the second direct current bus segment to be switched from an open state to a closed state so that the second direct current bus segment supplies power to the first direct current bus segment; and controlling the hybrid energy storage unit to provide power support to the first dc bus segment during the second bus tie switch switching state.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A customized power system facing to an AC/DC hybrid power supply mode is characterized by comprising:
A direct current bus and an alternating current bus; the direct current bus comprises a first direct current bus section, a second direct current bus section and a third direct current bus section; the alternating current bus comprises a first alternating current bus segment, a second alternating current bus segment and a third alternating current bus segment; the first direct current bus segment is connected with the first alternating current bus segment through a first current transformer, the second direct current bus segment is connected with the second alternating current bus segment through a second current transformer, and the third direct current bus segment is connected with the third alternating current bus segment through a third current transformer; the first converter, the second converter and the third converter are used for rectifying alternating current on the alternating current bus into direct current and providing the direct current to the direct current bus, or inverting a power supply at the direct current side into alternating current to be provided for the alternating current bus when alternating current power supply is interrupted;
the power supply unit comprises a first alternating current power supply unit, a second alternating current power supply unit and a third alternating current power supply unit, wherein the first alternating current power supply unit is connected with the first direct current bus segment, the second alternating current power supply unit is connected with the second direct current bus segment, and the third alternating current power supply unit is connected with the third direct current bus segment; a quick change-over switch is arranged between the first alternating current power supply unit and the second alternating current power supply unit, and the quick change-over switch is used for starting to switch when the first alternating current power supply unit or the second alternating current power supply unit is temporarily connected;
An ac load unit and a dc load unit; the direct current load unit comprises a first type direct current load, a second type direct current load and a third type direct current load, wherein the sensitivity degree to voltage continuity is reduced in sequence; the alternating current load unit comprises a first type alternating current load, a second type alternating current load and a third type alternating current load, wherein the sensitivity degree of the first type alternating current load, the second type alternating current load and the third type alternating current load to the power supply continuity is reduced in sequence; the first type of direct current load, the second type of direct current load and the third type of direct current load are respectively connected with the first direct current bus segment, the second direct current bus segment and the third direct current bus segment in a one-to-one correspondence manner; the first type of alternating current load, the second type of alternating current load and the third type of alternating current load are respectively connected with the first alternating current bus segment, the second alternating current bus segment and the third alternating current bus segment in a one-to-one correspondence manner.
2. The hybrid ac/dc power mode oriented customized power system according to claim 1, wherein the power supply unit further comprises:
the hybrid energy storage unit is connected with the first direct current bus section; the hybrid energy storage unit is used for supplying power to the first direct current bus section when the first alternating current power supply unit is in a sag;
The hybrid energy storage unit comprises a storage battery and a first superconducting energy storage subunit, wherein the storage battery is used for charging for standby discharging when the system is in normal operation, and the first superconducting energy storage subunit is used for stabilizing the direct-current voltage on the first direct-current bus segment and eliminating direct-current ripple, and performing transient high-current compensation when the storage battery is put into operation so as to reduce the impact of the storage battery and prolong the service life of the storage battery;
the second dc bus segment is further electrically connected to a second superconducting energy storage subunit for stabilizing a dc voltage on the second dc bus segment and for eliminating dc ripple.
3. The hybrid ac/dc hybrid mode oriented customized power system according to claim 2, wherein the power supply unit further comprises:
the power generator set is electrically connected with the second alternating current bus segment and is used for supplying power to the first alternating current bus segment, the second alternating current bus segment, the first direct current bus segment and the second direct current bus segment when power interruption occurs to the first alternating current power supply unit and the second alternating current power supply unit and the residual electric quantity of a storage battery connected to the first direct current bus is smaller than a first preset value;
A first bus tie switch is arranged between the first alternating current bus segment and the second alternating current bus segment, and the first bus tie switch is used for closing the first alternating current bus segment and the second alternating current bus segment when the generator set supplies power to the alternating current bus.
4. The customized power system for hybrid power supply according to claim 2, wherein,
a second bus tie switch is arranged between the first direct current bus segment and the second direct current bus segment; the second bus tie switch is used for closing the first direct current bus segment and the second direct current bus segment after the first converter fails, so that the second direct current bus segment supplies power to the first direct current bus segment; or after the second converter fails, closing the first direct current bus segment and the second direct current bus segment so that the first direct current bus segment supplies power to the second direct current bus segment;
the hybrid energy storage unit is also used for supplying power to the first direct current bus segment after the first converter fails and before the second bus tie switch is closed.
5. The customized power system for hybrid ac/dc power supply according to claim 3, wherein the power supply unit further comprises a photovoltaic power supply unit and/or a fan power supply unit; the photovoltaic power supply unit and/or the fan power supply unit are electrically connected with the third direct current bus segment;
a third bus tie switch is arranged between the third alternating current bus segment and the second alternating current bus segment; the third bus tie switch is used for closing the third alternating current bus segment and the second alternating current bus segment when the power supply interruption occurs to the first alternating current power supply unit and the second alternating current power supply unit, the energy storage of the first direct current bus segment and the energy storage of the second direct current bus segment are released, and the residual fuel of the diesel generator set is less than a second preset value and is exhausted, so that the third alternating current bus segment supplies power to all loads;
a fourth bus tie switch is arranged between the third direct current bus segment and the second direct current bus segment; and the fourth bus tie switch is used for closing the third direct current bus segment and the second direct current bus segment when the power supply amount of the photovoltaic power supply unit and/or the fan power supply unit to the third direct current bus segment is larger than the consumption amount of the third direct current load to wind and/or light energy sources, so that the photovoltaic power supply unit and/or the fan power supply unit can supply power to the second direct current bus segment and the first direct current bus segment.
6. The customized power system for hybrid ac/dc power supply according to claim 1, wherein the first type of dc load is connected in series with a superconducting current limiter, and the superconducting current limiter is used for limiting current flowing to the first type of dc load when a ground short circuit fault occurs, so as to ensure continuous operation of the load without tripping;
the second type of alternating current load comprises harmonic sensitive loads and sag sensitive loads; the harmonic sensitive load is connected in parallel with an active filter, and the active filter is used for filtering the voltage supplied to the harmonic sensitive load; the sag sensitive load is connected in series with a dynamic voltage restorer so as to cope with the influence of voltage sag or load impact on the sag sensitive load.
7. A control method for a customized power system, which is used for controlling the customized power system facing to the ac/dc hybrid power supply mode according to any one of claims 1 to 6, comprising:
when the first alternating current power supply unit, the second alternating current power supply unit and the third alternating current power supply unit are in a normal power supply state, controlling the first converter to rectify alternating current on the first alternating current bus segment into direct current and provide the direct current for the first direct current bus segment, controlling the second converter to rectify alternating current on the second alternating current bus segment into direct current and provide the direct current for the second direct current bus segment, and controlling the third converter to rectify alternating current on the third alternating current bus segment into direct current and provide the direct current for the third direct current bus segment;
And if the first alternating current power supply unit or the second alternating current power supply unit is in a sag, controlling the quick change-over switch to switch so as to enable the second alternating current power supply unit to supply power to the first alternating current bus section or enable the first alternating current power supply unit to supply power to the second alternating current bus section.
8. The method of claim 7, wherein the first dc bus segment is further connected to a hybrid energy storage unit; after the first ac power unit is temporarily dropped, the method further comprises:
controlling the hybrid energy storage unit to supply power to the first direct current bus segment, and controlling the first converter to invert direct current on the first direct current bus segment into alternating current so as to supply the alternating current to the first alternating current bus segment;
judging whether the difference value between the duration time of the sag of the first alternating current power supply unit and the half time supportable by the hybrid energy storage unit is smaller than a preset range, if so, controlling the quick change-over switch to start switching, and externally supplying power to the first direct current bus segment by the first alternating current power supply unit.
9. The method of claim 8, wherein the power supply unit further comprises a generator set electrically connected to the second ac bus segment; after the first ac power supply unit has a dip or a power interruption, the method further comprises:
If the second alternating current power supply unit is also subjected to sag or the control of the quick change-over switch to start and switch failure, and the residual electric quantity of the storage battery connected to the first direct current bus is smaller than a first preset value, the control of starting the generator set connected to the second alternating current bus segment is performed, and the control of closing of the first bus tie switch connected between the first alternating current bus segment and the second alternating current bus segment is performed, so that the generator set supplies power to the first alternating current bus segment and the second alternating current bus segment.
10. The method of controlling a customized power system as claimed in claim 8, further comprising:
if the first converter fails, controlling a second bus tie switch connected between the first direct current bus segment and the second direct current bus segment to be switched from an open state to a closed state so that the second direct current bus segment supplies power to the first direct current bus segment; and controlling a hybrid energy storage unit to provide power support to the first dc bus segment during the second bus tie switch switching state.
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| WO2014101497A1 (en) * | 2012-12-31 | 2014-07-03 | 国家电网公司 | Alternating current-direct current hybrid micro-grid system and control method therefor |
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| CN110138075A (en) * | 2019-04-10 | 2019-08-16 | 国网江苏省电力有限公司南通供电分公司 | Highly compatible alternating current-direct current mixes distribution system |
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| WO2014101497A1 (en) * | 2012-12-31 | 2014-07-03 | 国家电网公司 | Alternating current-direct current hybrid micro-grid system and control method therefor |
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