CN104505867B - Alternating current and direct current hybrid micro-grid system and control strategy thereof - Google Patents

Alternating current and direct current hybrid micro-grid system and control strategy thereof Download PDF

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CN104505867B
CN104505867B CN201510001858.4A CN201510001858A CN104505867B CN 104505867 B CN104505867 B CN 104505867B CN 201510001858 A CN201510001858 A CN 201510001858A CN 104505867 B CN104505867 B CN 104505867B
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dc
changer
ac
connected
grid
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CN201510001858.4A
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CN104505867A (en
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陈文波
王丽
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南京国臣信息自动化技术有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/563Power conversion electric or electronic aspects for grid-connected applications

Abstract

The invention discloses an alternating current and direct current hybrid micro-grid system and a control strategy of the micro-grid system. The micro-grid system comprises multiple generation units, load, a distribution line for connecting the generation units and the loads, and a monitoring protection unit; each generation unit comprises a large power grid, grid-connected AC/DC (alternating current/direct current) of the large power grid, an energy storage system, a DC/DC (direct current/direct current) converter of the energy storage system, a wind power generation system, an AC/DC converter of the wind power generation system, a photovoltaic power generation system, a DC/DC converter of the photovoltaic power generation system, and a diesel generator; said load includes AC non-significant load, AC significant load, AC/DC load, DC significant load and DC non-significant load; the distribution line comprises a DC distribution line and an AC distribution line; the operating status of each energy conversion device can be monitored in real time by the monitoring protection unit, two operating ways such as grid connection and isolation of the system can be realized by different control strategies, the distributive generation unit and the energy storage unit realize coordination and cooperation by controlling energy storage DC/DC, photovoltaic DC/DC, and wind power AC/DC, so that the power supply reliability is improved and the significant load can continuously operate.

Description

A kind of alternating current-direct current mixing micro-capacitance sensor system and its control strategy

Technical field

The present invention relates to a kind of micro-grid system, especially relate to a kind of alternating current-direct current mixing micro-capacitance sensor system, further relate to State the control strategy of alternating current-direct current mixing micro-capacitance sensor system.

Background technology

According to U.S. certs (the consortium for electric reliability technology Solutions) the definition to micro-capacitance sensor, micro-capacitance sensor is by load and distributed power source dgs (distributed Generations the individually controllable system) forming, provides electric energy and heat energy for local.

Distributed power source dgs due to pollution less, flexibly etc. many-sided advantage is rapidly developed in recent years for infield, but A large amount of dgs access electrical network and also create some harmful effects.Relatively for bulk power grid, micro-capacitance sensor is to receive distributed power source more Friendly mode.

The tremendous development of new material, information technology and Power Electronic Technique and extensive application, user is to need for electricity, electric energy Quality and power supply reliability etc. require to improve constantly, and particularly in modern chemical industry business development, sensitive loads (are important negative mostly Carry) a large amount of uses, the very high or even instantaneous voltage pulsation of the requirement to power supply reliability such as voltage dip, short interruptions Unit trip will be caused to shut down, cause huge economic loss even to cause human casualty accident, power supply reliability is required Reach 99 (99.9999999%) even 10 9 (99.99999999%).And the power supply reliability of conventional AC electrical network is big It it is generally 49 (99.99%), corresponding average power off time of user is substantially in about 0.876h (about 53min) it is contemplated that five 59 (99.999%) are reached after year.The high power supply reliability that this obviously can not meet important load requires.Existing exchange Micro-capacitance sensor and DC micro-electric network technology, due to energy storage device finite energy, also cannot meet so high power supply reliability.

In conjunction with the advantage of distributed power generation, distributed energy storage, using bulk power grid as backup support, alternating current-direct current mixing micro-capacitance sensor It is clearly a kind of effective way improving power supply reliability, can be good at meeting high power supply reliability while energy-conserving and environment-protective Demand it is ensured that important load run without interruption.

Content of the invention

Goal of the invention: the technical problem to be solved is to provide a kind of alternating current-direct current mixing micro-capacitance sensor system.

Present invention technical problem also to be solved is to provide the control strategy of above-mentioned alternating current-direct current mixing micro-capacitance sensor system.

For solving above-mentioned technical problem, the technology used in the present invention means are:

A kind of alternating current-direct current mixing micro-capacitance sensor system, including multiple generator units, load and for by generator unit with negative Carry the distribution line connecting, also include monitoring protection location;Described generator unit includes bulk power grid and its grid-connected ac/dc conversion Device, energy-storage system and its dc/dc changer, wind generator system and its ac/dc changer, photovoltaic generating system and its dc/dc Changer and diesel-driven generator;Described load includes exchanging insignificant load, exchange important load, alternating current-direct current load, direct current Important load and the insignificant load of direct current;Described distribution line includes DC power distribution line and AC power distribution line;

Wherein, described grid-connected ac/dc changer AC is connected with bulk power grid, and DC side is connected with dc bus;Described Energy storage dc/dc changer side is connected with energy-storage units, and opposite side is connected with dc bus;Described wind-force ac/dc changer one Side is connected with wind generator system, and opposite side is connected with dc bus;Described photovoltaic dc/dc changer side and photovoltaic generation system System connects, and opposite side is connected with dc bus;

The insignificant load of described exchange is connected with ac bus by dc/ac changer;Described exchange important load and friendship Stream bus is connected and is connected with dc bus by dc/ac changer simultaneously;Described alternating current-direct current load is connected simultaneously with ac bus It is connected with dc bus by dc/dc changer;Described direct current important load is connected same by dc/dc changer with dc bus When be connected with ac bus by ac/dc changer;Described direct current is insignificant to be loaded by dc/dc changer with dc bus even Connect;

Described monitoring protection location passes through can bus and described grid-connected ac/dc changer, energy storage dc/dc changer, wind-force Ac/dc changer, photovoltaic dc/dc changer and the dc/ac changer being connected with described exchange important load and described friendship are directly The dc/dc changer that the dc/dc changer that current load connects is connected with described direct current important load and described direct current are important negative Carry the ac/dc changer connecting the load dc/dc changer that be connected insignificant with described direct current to be communicated;

Described diesel-driven generator is connected with ac bus.

Wherein, described grid-connected ac/dc changer is two-way ac/dc changer, using three phase full bridge topological structure.

Wherein, described energy storage dc/dc changer adopts full-bridge topologies.

Wherein, described photovoltaic dc/dc changer adopts boost topological structure.

Wherein, described wind-force ac/dc changer adopts boost topological structure.

A kind of control strategy of alternating current-direct current mixing micro-capacitance sensor system, each generator unit of described alternating current-direct current mixing micro-capacitance sensor Running status determined by d-c bus voltage value;

When photovoltaic generation and wind-power electricity generation summation are more than bearing power, DC bus-bar voltage raises, when dc bus electricity When pressure is in full state higher than grid-connected ac/dc changer commutation inversion switching value and energy-storage units, whole system is in grid-connected Operational mode, in order to preferentially utilize photovoltaic and wind energy, sets grid-connected ac/dc changer commutation inversion switching value as specified directly Stream bus voltage value, grid-connected ac/dc changer is in inverter mode, and energy storage dc/dc changer is in stopped status, photovoltaic dc/ Dc changer and wind-force dc/dc changer are in mppt pattern;

When photovoltaic generation and wind-power electricity generation summation are more than bearing power, DC bus-bar voltage raises, when dc bus electricity When pressure is in underfill state higher than grid-connected ac/dc changer commutation inversion switching value and energy-storage units, whole system is in orphan Island operational mode, grid-connected ac/dc changer is in stopped status, and energy storage dc/dc changer is charged in constant current voltage limiting mode, photovoltaic Dc/dc changer and wind-force dc/dc changer are in mppt pattern;

When photovoltaic generation and wind-power electricity generation summation are more than bearing power, and when system is in islet operation pattern, grid-connected Ac/dc changer is in stopped status, if energy-storage units are in underfill state, energy storage dc/dc changer is with constant current voltage limiting side Formula charges, and photovoltaic dc/dc changer and wind-force dc/dc changer are in mppt pattern;If energy-storage units are in full state, storage Stopped status can be in by dc/dc changer, photovoltaic dc/dc changer and wind-force dc/dc changer are in constant voltage mode, and direct current is female Line voltage raises, until the stable maximum allowing in system;

When photovoltaic generation and wind-power electricity generation summation are less than bearing power, DC bus-bar voltage declines, when dc bus electricity Force down when grid-connected ac/dc changer commutation inversion switching value, system is in the pattern of being incorporated into the power networks, in order to preferentially utilize light Volt and wind energy, set grid-connected ac/dc changer commutation inversion switching value as nominal DC bus voltage value, grid-connected ac/dc conversion Device is in rectification state, if energy-storage units are in full state, energy storage dc/dc changer is shut down, otherwise energy storage dc/dc conversion Device is charged in constant current voltage limiting mode, and photovoltaic dc/dc changer and wind-force dc/dc changer are in mppt pattern;

When photovoltaic generation and wind-power electricity generation summation are less than bearing power, DC bus-bar voltage reduces, and system is in isolated island fortune Row mode, if now energy storage dc/dc changer is with the discharge threshold stable DC bus electricity less than nominal DC bus voltage value Pressure, grid-connected ac/dc changer is in stopped status, the electric discharge of energy storage dc/dc changer, photovoltaic dc/dc changer and wind-force dc/dc Changer is in mppt pattern;

When photovoltaic generation and wind-power electricity generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units When magnitude of voltage is less than the first setting value, for ensureing important load uninterrupted operation, excise insignificant load;

When photovoltaic generation and wind-power electricity generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units When magnitude of voltage is less than the second setting value, start diesel generating system, important load is powered by ac bus it is ensured that important load Run without interruption.

Wherein, nominal DC busbar voltage is 480~500v;It is 540v that energy-storage units are in voltage during full state;Directly Stream bus maximum allowable voltage is 510~520v;Energy-storage units voltage first setting value is 450~460v;Energy-storage units electricity The second setting value is pressed to be 400~410v.

Beneficial effect: alternating current-direct current mixing micro-capacitance sensor system layout of the present invention is reasonable, including multiple generator units and monitoring Protection location, according to the actual needs, system is in grid-connected or islet operation pattern, in islet operation pattern, when photovoltaic is sent out When the gross output of electricity and wind-power electricity generation is not enough, can switch to energy storage dc/dc electric discharge within the time of 200us, remain straight Stablizing of stream busbar voltage, in the case that energy-storage units voltage is less than the second setting value, can start diesel oil in 1min and send out Electric power generation, exports stable alternating current, even if that is, alternating current-direct current mixing micro-capacitance sensor system of the present invention is used up in energy-storage units energy In the case of, still important load can be maintained to run without interruption for a long time using diesel-driven generator;Alternating current-direct current mixing of the present invention is micro- Network system control strategy farthest optimizes the reasonable utilization of energy, optimizes the operation of system, by different controls System strategy, system is in grid-connected or two kinds of operational modes of isolated island, so that system achieves to distributed generation unit and energy storage The reasonable management of unit and use, system maintains direct current by the mutually coordinated cooperation of distributed generation unit and energy-storage units The stablizing of busbar voltage, the power supply reliability improving system is it is ensured that important load runs without interruption for a long time.

Brief description

Fig. 1 is the systematic schematic diagram of alternating current-direct current mixing micro-capacitance sensor system of the present invention.

Specific embodiment

With reference to specific embodiment and accompanying drawing, the technology contents of the present invention are described further.

As shown in figure 1, the alternating current-direct current mixing micro-capacitance sensor system of the present invention, including 5 generator units: bulk power grid and its capacity Grid-connected ac/dc for 40kw, capacity is accumulator battery energy-storage units and its energy storage dc/dc of 30kw × 2h, by energy-storage units Discharge and recharge maintain the energy balance, 20kw photovoltaic generating system and its photovoltaic dc/dc, 20kw wind generator system and its wind-force Dc/dc and diesel generating system;Also include loading and the distribution line for being connected generator unit with load, load bag Include 10kw exchange important load, 10kw alternating current-direct current load (herein refer to can Alternating Current Power Supply also can direct current supply converter), 10kw Direct current important load, the insignificant load of 20kw exchange and the insignificant load of 5kw direct current;Distribution line includes DC power distribution line And AC power distribution line;

Grid-connected ac/dc AC is connected with bulk power grid, DC side and dc bus even, energy storage dc/dc side and energy storage list Unit connects, and opposite side is connected with dc bus, and photovoltaic dc/dc side is connected with photovoltaic generating system, opposite side and dc bus Connect, wind-force ac/dc side is connected with wind generator system, and opposite side is connected with dc bus;

The insignificant load of exchange is connected with ac bus by dc/ac changer, and the insignificant load of direct current is become by dc/dc Parallel operation is connected with dc bus, and direct current important load is connected with dc bus by dc/dc changer and is converted by ac/dc simultaneously Device is connected with ac bus, and exchange important load is connected with ac bus and is connected with dc bus by dc/ac changer simultaneously, Alternating current-direct current load is connected with ac bus and is connected with dc bus by dc/dc changer simultaneously;

Alternating current-direct current mixing micro-capacitance sensor system of the present invention is additionally provided with monitoring protection location, and monitoring protection location passes through can bus With grid-connected ac/dc changer, energy storage dc/dc changer, photovoltaic dc/dc changer, wind-force ac/dc changer and with exchange weight The dc/ that the dc/dc changer that the dc/ac changer of connection to be loaded is connected with alternating current-direct current load is connected with direct current important load The dc/dc changer that the ac/dc changer load insignificant with direct current that dc changer is connected with direct current important load is connected enters Row communication;The running status of the monitoring each energy converter of protection location real-time monitoring, using different control strategies, by control Make grid-connected ac/dc and realize system grid connection and two kinds of methods of operation of isolated island, by controlling energy storage dc/dc, photovoltaic dc/dc, wind-force ac/ Dc realizes distributed generation unit and the mutually coordinated cooperation of energy-storage units, improves power supply reliability it is ensured that important load is uninterrupted Run;

The diesel-driven generator of generator unit is connected with ac bus, and, as AC safety watl power supply, it can for diesel-driven generator Loading demand all can not be met in bulk power grid, photovoltaic generating system, wind generator system and energy-storage units discharge to a certain extent Shi Qidong, meets important load and powers for a long time;

Wind generator system in present system and photovoltaic generating system are to be generated electricity using clean reproducible energy, Play the effect of energy-conserving and environment-protective, alleviate the dual-pressure of the energy and environment;

Energy-storage units in present system are accumulator battery, meet system capacity by the charging and discharging of accumulator battery Balance, maintains DC bus-bar voltage constant;

Grid-connected ac/dc in present system is two-way ac/dc changer, using three phase full bridge topological structure, its exchange Side is connected with bulk power grid, and DC side is connected with dc bus;Under simultaneously net state, grid-connected ac/dc normal work, realize bulk power grid Energy in bidirectional flow and other generator units between;Under island state, grid-connected ac/dc is in holding state;

Energy storage dc/dc in present system, using full-bridge topologies, its side is connected with energy-storage units, opposite side It is connected with dc bus, for controlling the discharge and recharge of energy-storage units;Energy storage dc/dc be operated in the way of constant current voltage limiting charging or Discharge condition, and keep the energy of energy-storage units storage to disclosure satisfy that in bulk power grid, photovoltaic generating system, wind-power electricity generation as far as possible In the case that system all can not meet loading demand, the short time meeting important load powers;

Photovoltaic dc/dc in present system, using boost topological structure, its side is connected with photovoltaic generating system, separately Side is connected with dc bus, is used for realizing maximum power point of photovoltaic power generation system tracking (mppt), improves solar energy utilization ratio;

Wind-force ac/dc in present system, using boost topological structure, its side is connected with wind generator system, separately Side is connected with dc bus, and the alternating current for sending blower fan is converted into unidirectional current, reduces the grid-connected of wind generator system Difficulty, realizes wind generator system MPPT maximum power point tracking simultaneously, improves wind energy utilization;Under simultaneously net state, photovoltaic dc/dc All mppt pattern is operated in using conductance increment method with wind-force dc/dc;Under island state, when photovoltaic generating system and wind-force are sent out When the generating general power of electric system is less than load general power, it is operated in mppt pattern, when photovoltaic generating system and wind-power electricity generation system When the generating general power of system is more than load general power and energy-storage units and is in full state, exit mppt pattern, enter constant voltage mould Formula, prevents significantly lifting bus voltage.

The control strategy of monitoring protection location execution system, optimizes the operation of alternating current-direct current mixing micro-capacitance sensor system: grid-connected ac/ Dc commutation inversion switching value is nominal DC bus voltage value;Nominal DC busbar voltage: 480~500v;Energy-storage units are in Voltage during full state: 540v;Dc bus maximum allowable voltage: 510~520v (highest electricity that be can bear according to load Pressure determines that DC bus-bar voltage maximum is 520v);Energy-storage units voltage first setting value is 450~460v;Energy-storage units electricity The second setting value is pressed to be 400~410v;The running status of 5 generator units is determined by d-c bus voltage value:

When photovoltaic generation and wind-power electricity generation summation are more than bearing power and energy storage charge requirement, on DC bus-bar voltage Rise, more than specified bus voltage value 500v, system grid connection is run, and grid-connected ac/dc is in inverter mode, and energy is by dc bus stream To bulk power grid, photovoltaic dc/dc and wind-force dc/dc is in mppt pattern, if it is energy-storage units that energy-storage units are in underfill state When voltage is less than 540v, energy storage dc/dc is in charged state, when the fully charged i.e. energy-storage units voltage of energy-storage units is 540v, Energy storage dc/dc is in stopped status, and grid-connected ac/dc maintains busbar voltage in rated value 500v;

When photovoltaic generation and wind-power electricity generation summation are less than bearing power and energy storage charge requirement, DC bus-bar voltage drops Low, less than specified bus voltage value 500v, system grid connection is run, and grid-connected ac/dc is in rectification state, and energy is by bulk power grid stream To dc bus, photovoltaic dc/dc and wind-force dc/dc is in mppt pattern, if it is energy storage list that energy-storage units are in underfill state When first voltage is less than 540v, energy storage dc/dc is in charged state, treats that the fully charged i.e. energy-storage units voltage of energy-storage units is 540v When, energy storage dc/dc is in stopped status, and grid-connected ac/dc maintains busbar voltage in rated value 500v;

When photovoltaic generation and wind-power electricity generation summation be more than bearing power and energy-storage units to be in underfill state be energy storage list When first voltage is less than 540v, system islet operation, photovoltaic dc/dc and wind-force dc/dc is in mppt pattern, and energy storage dc/dc is in Charged state, when the fully charged i.e. energy-storage units voltage of energy-storage units is 540v, energy storage dc/dc is in stopped status, due to sending out Electrical power is more than bearing power, and busbar voltage rises to maximum permissible value 520v, photovoltaic dc/dc and wind-force dc/dc and changes to perseverance Die pressing type, stable DC busbar voltage is in maximum;

Under islet operation pattern, when photovoltaic generation and wind-power electricity generation summation are less than bearing power, DC bus-bar voltage Reduce, within the switching time of 200us, energy storage dc/dc with less than nominal DC bus voltage value to load discharge, when energy storage list When first magnitude of voltage is less than the first setting value 460v, for ensureing important load uninterrupted operation, excise insignificant load;Energy-storage units Continue electric discharge, when energy-storage units magnitude of voltage is less than the second setting value 400v, start diesel generating system, diesel oil is sent out in 1min The stable alternating current of electric system output, important load switches to ac bus and powers it is ensured that important load runs without interruption.

Table 1 be present system under different conditions, each generator unit running status:

Table 1

Above-mentioned embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to described embodiment Restriction, other any spirit without departing from the present invention and the change made under principle, modification, replacement, combine, simplify, All should be equivalent substitute mode, be included within protection scope of the present invention.

Claims (7)

1. a kind of control method of alternating current-direct current mixing micro-capacitance sensor system it is characterised in that:
The running status of each generator unit of described alternating current-direct current mixing micro-capacitance sensor is determined by d-c bus voltage value;
When photovoltaic generation and wind-power electricity generation summation are more than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage is high In grid-connected ac/dc changer commutation inversion switching value and when energy-storage units are in full state, whole system is in and is incorporated into the power networks Pattern, in order to preferentially utilize photovoltaic and wind energy, sets grid-connected ac/dc changer commutation inversion switching value female as nominal DC Line voltage value, grid-connected ac/dc changer is in inverter mode, and energy storage dc/dc changer is in stopped status, and photovoltaic dc/dc becomes Parallel operation and wind-force dc/dc changer are in mppt pattern;
When photovoltaic generation and wind-power electricity generation summation are more than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage is high In grid-connected ac/dc changer commutation inversion switching value and when energy-storage units are in underfill state, whole system is in isolated island fortune Row mode, grid-connected ac/dc changer is in stopped status, and energy storage dc/dc changer is charged in constant current voltage limiting mode, photovoltaic dc/ Dc changer and wind-force dc/dc changer are in mppt pattern;
When photovoltaic generation and wind-power electricity generation summation are more than bearing power, and when system is in islet operation pattern, grid-connected ac/dc Changer is in stopped status, if energy-storage units are in underfill state, energy storage dc/dc changer is filled in constant current voltage limiting mode Electricity, photovoltaic dc/dc changer and wind-force dc/dc changer are in mppt pattern;If energy-storage units are in full state, energy storage Dc/dc changer is in stopped status, and photovoltaic dc/dc changer and wind-force dc/dc changer are in constant voltage mode, dc bus Voltage raises, until the stable maximum allowing in system;
When photovoltaic generation and wind-power electricity generation summation are less than bearing power, DC bus-bar voltage declines, when DC bus-bar voltage is low When grid-connected ac/dc changer commutation inversion switching value, system is in the pattern of being incorporated into the power networks, in order to preferentially utilize photovoltaic and Wind energy, sets grid-connected ac/dc changer commutation inversion switching value as nominal DC bus voltage value, at grid-connected ac/dc changer In rectification state, if energy-storage units are in full state, energy storage dc/dc changer is shut down, otherwise energy storage dc/dc changer with Constant current voltage limiting mode charges, and photovoltaic dc/dc changer and wind-force dc/dc changer are in mppt pattern;
When photovoltaic generation and wind-power electricity generation summation are less than bearing power, DC bus-bar voltage reduces, and system is in islet operation mould Formula, if now energy storage dc/dc changer is with the discharge threshold stable DC busbar voltage less than nominal DC bus voltage value, and Net ac/dc changer is in stopped status, and energy storage dc/dc changer discharges, and photovoltaic dc/dc changer and wind-force dc/dc convert Device is in mppt pattern;
When photovoltaic generation and wind-power electricity generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units voltage When value is less than the first setting value, for ensureing important load uninterrupted operation, excise insignificant load;
When photovoltaic generation and wind-power electricity generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units voltage When value is less than the second setting value, start diesel generating system, important load is powered by ac bus it is ensured that important load is uninterrupted Run.
2. according to claim 1 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described nominal DC Busbar voltage is 480~500v;It is 540v that described energy-storage units are in voltage during full state;Described dc bus is maximum allowable Magnitude of voltage is 510~520v;Described energy-storage units voltage first setting value is 450~460v;Described energy-storage units voltage second Setting value is 400~410v.
3. according to claim 1 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described alternating current-direct current mix Close micro-grid system, including multiple generator units, load and the distribution line for being connected generator unit with load, also wrap Include monitoring protection location;Described generator unit includes bulk power grid and its grid-connected ac/dc changer, energy-storage system and its dc/dc become Parallel operation, wind generator system and its ac/dc changer, photovoltaic generating system and its dc/dc changer and diesel-driven generator;Institute State load includes exchange insignificant load, exchange important load, alternating current-direct current load, direct current important load and direct current insignificant bear Carry;Described distribution line includes DC power distribution line and AC power distribution line;
Wherein, described grid-connected ac/dc changer AC is connected with bulk power grid, and DC side is connected with dc bus;Described energy storage Dc/dc changer side is connected with energy-storage units, and opposite side is connected with dc bus;Described wind-force ac/dc changer side with Wind generator system connects, and opposite side is connected with dc bus;Described photovoltaic dc/dc changer side is with photovoltaic generating system even Connect, opposite side is connected with dc bus;
The insignificant load of described exchange is connected with dc bus by dc/ac changer;Described exchange important load and exchange mother Line is connected and is connected with dc bus by dc/ac changer simultaneously;Described alternating current-direct current load is connected with ac bus and passes through simultaneously Dc/dc changer is connected with dc bus;Described direct current important load is connected with dc bus by dc/dc changer and leads to simultaneously Cross ac/dc changer to be connected with ac bus;The insignificant load of described direct current is connected with dc bus by dc/dc changer;
Described monitoring protection location passes through can bus and described grid-connected ac/dc changer, energy storage dc/dc changer, wind-force ac/ Dc changer, photovoltaic dc/dc changer and the dc/ac changer being connected with described exchange important load and described alternating current-direct current Dc/dc changer and described direct current important load that the dc/dc changer that load connects is connected with described direct current important load The dc/dc changer that the ac/dc changer load insignificant with described direct current connecting is connected is communicated;
Described diesel-driven generator is connected with ac bus.
4. according to claim 3 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described grid-connected ac/ Dc changer is two-way ac/dc changer, using three phase full bridge topological structure.
5. according to claim 3 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described energy storage dc/ Dc changer adopts full-bridge topologies.
6. according to claim 3 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described photovoltaic dc/ Dc changer adopts boost topological structure.
7. according to claim 3 alternating current-direct current mixing micro-capacitance sensor system control method it is characterised in that: described wind-force ac/ Dc changer adopts boost topological structure.
CN201510001858.4A 2015-01-04 2015-01-04 Alternating current and direct current hybrid micro-grid system and control strategy thereof CN104505867B (en)

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