CN110829507A - Power supply method of island special energy router - Google Patents

Power supply method of island special energy router Download PDF

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CN110829507A
CN110829507A CN201911152745.9A CN201911152745A CN110829507A CN 110829507 A CN110829507 A CN 110829507A CN 201911152745 A CN201911152745 A CN 201911152745A CN 110829507 A CN110829507 A CN 110829507A
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bus
power supply
power
alternating current
voltage
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CN110829507B (en
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周乐明
易伟浪
姜捷
刘思怡
王舒克
周杰
肖婵
彭聪
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Hunan University
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Hunan University
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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
    • H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power supply method of an island special energy router, wherein the energy router comprises an AC/DC bus: the alternating current power supply unit is converged into the direct current bus through the AC/DC converter, the photovoltaic array is converged into the direct current bus through the phase-shifted full bridge 1, and the energy storage unit realizes energy interaction with the direct current bus through the bidirectional DAB converter; the alternating current power supply unit is converged into an alternating current bus through the bypass switch, the direct current bus realizes energy interaction with the alternating current bus through the PWM inverter, and the alternating current bus respectively supplies power to a three-phase alternating current load and a single-phase alternating current load; the direct current bus adopts the photovoltaic, the energy storage unit and the alternating current power supply unit to jointly supply power, and the accepting capability of the wide input voltage range is effectively improved. Under the overload working condition, the PWM inverter and the alternating current power supply unit are adopted to jointly supply power, two alternating current energy channels can be provided at the same time, and the overload capacity of the power supply is effectively improved.

Description

Power supply method of island special energy router
Technical Field
The invention relates to the field of power control, in particular to a power supply method of an island special energy router.
Background
The sea area of China is wide, the coastline is long and narrow, the islands are numerous, and the coastal zone resources are rich. The sea island has special important status in the safety of the state and the national defense as the sentinel battle of the strategy of 'the road of silk at sea'; sea island development is a great deployment for implementing ocean engineering in China and is a necessary way for China to move to the ocean forcing nation. At present, military weaponry, national defense and civil facilities of islands need stable and reliable power supply in urgent need. The high-reliability power supply system is a foundation stone and an important guarantee for island construction.
Various new energy sources such as solar energy, wind energy, wave energy, biomass energy and the like in the island are abundant in storage, and compared with the traditional diesel power generation, the new energy sources have the defects of limited power supply capacity, large environmental influence, output power fluctuation and the like. For remote but strategic islands, it is difficult to realize cross-sea long-distance power transmission of an internal distribution network due to the huge technical and economic cost of laying submarine cables. Therefore, aiming at the sustainability development strategy and the energy limitation in the island, a wind-solar-storage-like multi-distributed power supply with extremely high uncertainty and volatility must be accommodated in the island. Meanwhile, military loads such as island high-energy weaponry, impact civil loads such as port operation, sensitive industrial loads such as communication base stations and the like need high-quality and high-reliability power supply, a common diesel engine set is low in response speed and cannot output instant high energy, a power electronic device with high response speed is limited in overcurrent capacity and cannot operate in an overload mode for a long time, the existing electric energy interconnection topology cannot meet island special load requirements such as high power supply instant energy and long overload duration, the performance of important high-energy weaponry is severely restricted, and the high overload needs to be broken through urgently, and the important problem of a wide-range electric energy input intelligent interconnection system is solved.
Disclosure of Invention
The invention aims to solve the technical problem that the existing power interconnection topology is difficult to meet the special load requirements of high instantaneous energy, long overload duration and the like of a power supply.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a power supply method of an island special energy router comprises a direct current bus and an alternating current bus; the input side of the direct current bus is connected with the AC/DC converter, the input side phase-shifted full bridge and the bidirectional DAB; the output side of the direct current bus is connected with the PWM inverter and at least one output side phase-shifted full bridge; the AC/DC converter is connected with an alternating current power supply unit; the alternating current power supply unit is connected with the bypass switch; the PWM inverter and the bypass switch are both connected with an alternating current bus; the method comprises the following steps:
light or no load supply, PLoad<PvmaxThe method comprises the following steps:
under the working condition that the SOC is less than 95%, the energy storage unit works in a charging mode, the photovoltaic array works in a constant-voltage control operation mode, the alternating-current power supply unit is in a standby state, and the alternating-current bus adopts a PWM inverter for supplying power;
under the working condition that the SOC is more than 95%, the energy storage unit stops charging and keeps a standby state, the photovoltaic power generation is in a constant voltage control operation mode, the alternating current control unit is in a standby state, and the alternating current bus adopts a PWM inverter to supply power;
heavy duty power supply, Pvmax<PLoad<Pdmax+PvmaxUnder the working condition, the photovoltaic power generation MPPT tracks the maximum output power, the AC power supply unit outputs power through an AC/DC converter, the power difference between a compensation load and the photovoltaic power generation is compensated, the energy storage unit is in a standby state, and a PWM inverter is adopted on an AC bus for power supply;
heavy duty power supply, PLoad>Pdmax+Pvmax，SOC>Under the working condition of 20%, the AC power supply unit outputs the maximum power, the photovoltaic power generation MPPT tracks and outputs the maximum power, the energy storage unit is in a discharge state and works in a voltage stabilization mode, the power difference among the load, the energy storage and the photovoltaic power generation is automatically compensated, and a PWM inverter is adopted on the AC bus for power supply; SOC<Under the working condition of 20%, the alternating current power supply unit outputs the maximum power by controlling the phase-shifted full-bridge module, the photovoltaic power generation MPPT tracks and outputs the maximum power, the energy storage unit is in a standby state, meanwhile, the output interface cuts off non-main loads, and a PWM (pulse width modulation) inverter is adopted on an alternating current bus for supplying power;
under the short-time overload power supply working condition, the direct-current bus alternating-current power supply unit outputs the maximum power, the photovoltaic power generation MPPT tracks and outputs the maximum power, and the energy storage unit works in a voltage stabilization mode; when the output voltage of the PWM inverter exceeds a limit value, a switch signal S is triggered immediately to switch on a bypass switch, and the AC power supply unit and the PWM inverter are supplied with power jointly; the rear-stage PWM inverter adopts a virtual synchronous control method to ensure that the PWM inverter outputs a voltage upwmWith the output voltage u of the AC supply unitsThe amplitude phases are consistent;
wherein, PLoadRepresenting the total power of the load, PdmaxRepresenting the maximum power output, P, of the AC/DC converter of the AC supply unitvmaxRepresenting the maximum power output of the photovoltaic array.
The input side phase-shifted full bridge is connected with the photovoltaic array; the bidirectional DAB is connected with the energy storage unit; and the direct current bus is connected with the direct current bus interconnection interface.
The alternating current bus is connected with a three-phase alternating current interface and a single-phase alternating current interface.
The number of the output side phase shifting full bridges is two, wherein one output side phase shifting full bridge is connected with the high-voltage direct-current interface, and the other output side phase shifting full bridge is connected with the low-voltage direct-current interface.
The AC power supply unit adopts a DC bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, VorefAnd VbusThe difference between the two is used to generate a phase-shift duty ratio D by a PI controller1，D1＝kp(Voref-Vbus)+ki∫(Voref-Vbus) dt; wherein k isp，kiRespectively, the proportional and integral parameters of the PI controller.
The control modes of the bidirectional DAB comprise voltage stabilization control, charging control and starting control; wherein:
the voltage stabilization control formula is as follows:
Figure BDA0002283990830000031
D2-1is the preceding phase shift duty ratio of the energy storage unit, D2-2Is the phase-shift duty ratio of the energy storage unit at the later stage, D2-3Is the duty ratio of the external phase shift of the energy storage unit; k is a radical ofp，kiRespectively representing proportional and integral parameters of the PI controller; vorefIs a direct current bus voltage reference value; vbusThe actual value of the voltage of the direct current bus is obtained;
the charge control formula is as follows:
Figure BDA0002283990830000032
Vboutputting an actual value for the energy storage unit; f. ofopRepresenting a transformation function using an optimization algorithm;
the start-up control formula is as follows: d2-1＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt。
The photovoltaic array control process includes:
MPPT control: according to photovoltaic output power PvAnd the output voltageVpvCalculating the output voltage reference value V of the photovoltaic array by adopting MPPT algorithmpvrefAnd the photovoltaic actual voltage VpvAfter the difference is made, a phase-shift duty ratio D is generated by a controllerpv：
Dpv＝kp(Vpvref-Vpv)+ki∫(Vpvref-Vpv)dt；
Vpvref＝fMPPT(Pv,Vpv)；
Wherein f isMPPTRepresenting a transformation function, k, using the MPPT algorithmp，kiRespectively representing proportional and integral parameters of the PI controller;
constant voltage control: using a DC side bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, the difference between the two is calculated by a PI controller to obtain a phase-shift duty ratio Dpv；Dpv＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt。
The virtual synchronous control method of the PWM inverter comprises the following steps: calculating output voltage u of alternating current control unit through phase-locked loopsThen in conjunction with the AC bus voltage amplitude VACCalculating the output voltage reference value u of the PWM inverteracrefThe calculated voltage reference value uacrefAnd the actual output voltage u of the PWM inverteracMaking a difference, and obtaining the duty ratio D of the PWM inverter by the PI controller3：D3＝kp(uacref-uac)+ki∫(uacref-uac) dt; wherein u isacref＝VACsin(ωt+θ)；kp，kiRespectively representing the proportional and integral parameters of the PI controller.
Compared with the prior art, the invention has the beneficial effects that: the photovoltaic power generation system adopts a phase-shifted full-bridge structure, and the three-phase alternating-current unit is connected to the direct-current bus by adopting the phase-shifted full-bridge structure, so that the accepting capability of the system in a wide input voltage range is effectively improved. Meanwhile, a power supply method comprising multi-mode switching is adopted, so that new energy can be utilized to the maximum extent, and the problem that the new energy is difficult to accept and utilize is effectively solved. In addition, the three-phase alternating current unit is adopted, photovoltaic power generation and the energy storage unit are used for supplying power jointly, the alternating current bus side supplies power jointly according to the bypass switch and the PWM inverter, two alternating current energy channels can be provided simultaneously, the short-time overload capacity of the power supply is effectively improved, and the problem that the existing electric energy interconnection topology cannot meet island special load requirements such as high instantaneous energy and long overload duration of the power supply is solved. Meanwhile, the power supply method of switching various modes is combined, new energy can be effectively utilized,
drawings
FIG. 1 is a block diagram of a special energy router in accordance with one embodiment of the present invention;
FIG. 2 is a diagram illustrating six operation modes according to an embodiment of the present invention;
FIG. 3 is a block diagram of an embodiment of an AC unit control architecture;
FIG. 4 is a DAB control block diagram illustrating an example of the present invention; wherein, (a) voltage stabilization control; (b) controlling charging; (c) starting control;
FIG. 5 is a block diagram of photovoltaic power generation control according to an embodiment of the present invention; (a) MPPT control; (b) constant pressure control;
FIG. 6 is a block diagram of an exemplary PWM virtual synchronous control according to the present invention.
Detailed Description
As shown in fig. 1, the special energy router includes two buses, i.e. an ac bus and a dc bus: the alternating current power supply unit is converged into the direct current bus through the AC/DC converter, the photovoltaic array is converged into the direct current bus through the phase-shifted full bridge 2, and the energy storage unit realizes energy interaction with the direct current bus through the bidirectional DAB converter; the alternating current power supply unit is converged into an alternating current bus through the bypass switch, and the direct current bus and the alternating current bus realize energy interaction through the PWM inverter; the alternating current bus supplies power to three-phase and single-phase alternating current loads respectively, the direct current bus supplies power to different direct current loads through the phase-shifted full-bridge converters 3 and 4 respectively, and meanwhile, a direct current bus interconnection interface is reserved, so that system expansion is facilitated.
As shown in fig. 1 to 2, the power converter is powered as follows:
the first mode is as follows: light or no load supply, PLoad<Pvmax，SOC<Under the working condition of 95%, the energy storage unit adopts charging control to charge, the photovoltaic power generation adopts constant voltage control to maintain the voltage of a direct current bus to be stable, the alternating current power supply unit is in a standby state, and the alternating current bus adopts a PWM inverter to supply power;
and a second mode: light or no load supply, PLoad<Pvmax，SOC>Under the working condition of 95%, the energy storage unit stops charging and keeps a standby state, the photovoltaic power generation adopts constant voltage control to maintain the voltage of a direct current bus to be stable, an alternating current power supply unit is in the standby state, and an alternating current bus adopts a PWM inverter to supply power;
and a third mode: heavy duty power supply, Pvmax<PLoad<Pdmax+PvmaxUnder the working condition, the photovoltaic power generation MPPT tracks and outputs the maximum power, and the alternating current power supply unit controls the duty ratio D1The power difference between the load and the photovoltaic is compensated, the energy storage unit is in a standby state, and the alternating current bus adopts a PWM inverter to supply power;
and a fourth mode: heavy duty power supply, PLoad>Pdmax+Pvmax，SOC>Under the working condition of 20%, the alternating current power supply unit outputs the maximum power, the photovoltaic power generation MPPT tracks the maximum output power, the energy storage unit is in a discharge state and works in a voltage stabilization mode to automatically compensate the power difference among the load, the energy storage and the photovoltaic, and the alternating current bus adopts a PWM inverter to supply power;
and a fifth mode: heavy duty power supply, PLoad>Pdmax+Pvmax，SOC<Under the working condition of 20 percent, the AC power supply unit controls the duty ratio D1The maximum power is output, the maximum output power is tracked by the photovoltaic power generation MPPT, the energy storage unit is in a standby state, non-main loads are removed by the output interface, and the alternating current bus is supplied with power by the PWM inverter.
Mode six: under the short-time overload power supply working condition, the direct current bus alternating current power supply unit controls the duty ratio D1Outputting maximum power, tracking the maximum output power by the photovoltaic power generation MPPT, and operating the energy storage unit in a voltage stabilization mode; when the output current of the PWM inverter is detected to exceed the limit value, the switching signal S is triggered immediately to switch on the bypass switch to exchange the alternating currentThe power supply unit and the PWM inverter are used for supplying power in a combined manner, so that two additional instantaneous energy loops are added, and the short-time energy output capacity of the power supply is improved;
as shown in FIG. 3, the AC power supply unit adopts a DC side bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, VorefAnd VbusThe difference between the two is used to generate a phase-shift duty ratio D by a PI controller1The specific expression is as follows:
D1＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt
wherein k isp，kiRespectively, the proportional and integral parameters of the PI controller.
As shown in fig. 4, the energy storage DAB is divided into three control modes, namely voltage stabilization control, charging control and starting control.
(1) And (3) voltage stabilization control: energy flows from the energy storage unit to the direct current bus, and a direct current side bus voltage reference value V is adoptedorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, the difference between the two is calculated by the controller and then combined with the output voltage value V of the energy storage unitbAnd the actual value V of the DC bus voltagebusObtaining the preceding-stage phase-shifting duty ratio D of the energy storage unit through an optimization control algorithm2-1The phase shift duty ratio D of the later stage2-2Duty ratio D of outer phase shift2-3The specific expression is as follows:
Figure BDA0002283990830000061
wherein f isopRepresentation optimization algorithm, kp，kiIndicating proportional and integral parameters of PI controllers, respectively
(2) And (3) charging control: energy flows from the direct current bus to the energy storage unit, and the energy storage battery is adopted to output a voltage reference value VbrefAs a control command value, the energy storage unit outputs an actual value VbAs a feedback value, the difference between the two is calculated by the PI controller and then combined with the output voltage value V of the energy storage unitbAnd a direct currentActual value V of bus voltagebusObtaining the preceding-stage phase-shifting duty ratio D of the energy storage unit through an optimization control algorithm2-1The phase shift duty ratio D of the later stage2-2Duty ratio D of outer phase shift2-3。
Figure BDA0002283990830000062
Wherein f isopTransformation functions representing optimization algorithms (S.Shao, M.Jiang, W.Ye, Y.Li, J.Zhang, and K.Sheng, "Optimal Phase Shift Control to Minimize Reactive Power for a Dual active Bridge DC-DC Converter". IEEE Trans. Power Electron., pp.1-12,2019), kp，kiIndicating proportional and integral parameters of PI controllers, respectively
(3) Starting control: energy flows from the energy storage battery to the direct current bus, and a direct current side bus voltage reference value V is adoptedorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, the difference between the two is calculated by a PI controller to obtain the DAB pre-stage duty ratio D2-1And the DAB rear-stage blocking pulse adopts a full-bridge rectification output mode, and the specific expression of the full-bridge rectification output mode is as follows:
D2-1＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt
wherein k isp，kiIndicating proportional and integral parameters of PI controllers, respectively
As shown in fig. 4, the photovoltaic power generation is divided into two types of control, and the MPPT tracking control and the constant voltage control are specifically as follows:
(1) MPPT control: according to photovoltaic output power PvAnd an output voltage VpvCalculating the output voltage reference value V of the photovoltaic array by adopting MPPT algorithmpvrefAnd the photovoltaic actual voltage VpvAfter the difference is made, a phase-shift duty ratio D is generated by a controllerpv. The specific expression is as follows:
Vpvref＝fMPPT(Pv,Vpv)
Dpv＝kp(Vpvref-Vpv)+ki∫(Vpvref-Vpv)dt
wherein f isMPPTTransformation function representing MPPT algorithm (Poplar eternal, Monte Kelly, photovoltaic cell modeling and MPPT control strategy [ J)]The journal of electrotechnology 2011, 26(1):229-p，kiRespectively, the proportional and integral parameters of the PI controller.
(2) Constant voltage control: using a DC side bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, the difference between the two is calculated by a PI controller to obtain a phase-shift duty ratio Dpv. The specific expression is as follows:
Dpv＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt
wherein k isp，kiIndicating proportional and integral parameters of PI controllers, respectively
As shown in FIG. 5, the virtual synchronous control method of the PWM inverter calculates the output voltage u of the AC control unit through a phase-locked loop (PLL)sThen in conjunction with the AC bus voltage amplitude VACCalculating the output voltage reference value u of the PWM inverteracrefThe calculated voltage reference value uacrefAnd the actual output voltage u of the PWM inverteracObtaining the duty ratio D of the PWM inverter through a PI controller3The specific expression is as follows:
uacref＝VACsin(ωt+θ)
D3＝kp(uacref-uac)+ki∫(uacref-uac)dt
wherein k isp，kiRespectively representing the proportional and integral parameters of the PI controller.

Claims (8)

1. A power supply method of an island special energy router comprises a direct current bus and an alternating current bus; the input side of the direct current bus is connected with the AC/DC converter, the input side phase-shifted full bridge and the bidirectional DAB; the output side of the direct current bus is connected with the PWM inverter and at least one output side phase-shifted full bridge; the AC/DC converter is connected with an alternating current power supply unit; the alternating current power supply unit is connected with the bypass switch; the PWM inverter and the bypass switch are both connected with an alternating current bus; it is characterized by comprising:
light or no load supply, PLoad<PvmaxThe method comprises the following steps:
under the working condition that the SOC is less than 95%, the energy storage unit works in a charging mode, the photovoltaic array works in a constant-voltage control operation mode, the alternating-current power supply unit is in a standby state, and the alternating-current bus adopts a PWM inverter for supplying power;
under the working condition that the SOC is more than 95%, the energy storage unit stops charging and keeps a standby state, the photovoltaic power generation is in a constant voltage control operation mode, the alternating current control unit is in a standby state, and the alternating current bus adopts a PWM inverter to supply power;
heavy duty power supply, Pvmax<PLoad<Pdmax+PvmaxUnder the working condition, the photovoltaic power generation MPPT tracks the maximum output power, the AC power supply unit outputs power through an AC/DC converter, the power difference between a compensation load and the photovoltaic power generation is compensated, the energy storage unit is in a standby state, and a PWM inverter is adopted on an AC bus for power supply;
heavy duty power supply, PLoad>Pdmax+Pvmax，SOC>Under the working condition of 20%, the AC power supply unit outputs the maximum power, the photovoltaic power generation MPPT tracks and outputs the maximum power, the energy storage unit is in a discharge state and works in a voltage stabilization mode, the power difference among the load, the energy storage and the photovoltaic power generation is automatically compensated, and a PWM inverter is adopted on the AC bus for power supply; SOC<Under the working condition of 20%, the alternating current power supply unit outputs the maximum power by controlling the phase-shifted full-bridge module, the photovoltaic power generation MPPT tracks and outputs the maximum power, the energy storage unit is in a standby state, meanwhile, the output interface cuts off non-main loads, and a PWM (pulse width modulation) inverter is adopted on an alternating current bus for supplying power;
under the short-time overload power supply working condition, the direct-current bus alternating-current power supply unit outputs the maximum power, the photovoltaic power generation MPPT tracks and outputs the maximum power, and the energy storage unit works in a voltage stabilization mode; when the output voltage of the PWM inverter is detected to exceed the limit value, the PWM inverter is immediately triggered to be turned onThe off signal S is used for switching on the bypass switch and carrying out combined power supply on the alternating current power supply unit and the PWM inverter; the rear-stage PWM inverter adopts a virtual synchronous control method to ensure that the PWM inverter outputs a voltage upwmWith the output voltage u of the AC supply unitsThe amplitude phases are consistent;
wherein, PLoadRepresenting the total power of the load, PdmaxRepresenting the maximum power output, P, of the AC/DC converter of the AC supply unitvmaxRepresenting the maximum power output of the photovoltaic array.
2. The method for powering an island special energy router according to claim 1, wherein the input side phase-shifted full bridge is connected to a photovoltaic array; the bidirectional DAB is connected with the energy storage unit; and the direct current bus is connected with the direct current bus interconnection interface.
3. The method for supplying power to a special energy router on a sea island of claim 1, wherein the ac bus is connected to a three-phase ac interface and a single-phase ac interface.
4. The power supply method of the special energy router for the island according to any one of claims 1 to 3, wherein the number of the output side phase-shifted full bridges is two, one output side phase-shifted full bridge is connected with the high-voltage direct-current interface, and the other output side phase-shifted full bridge is connected with the low-voltage direct-current interface.
5. The power supply method of the special energy router on the island as claimed in claim 1, wherein the AC power supply unit adopts a DC bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, VorefAnd VbusThe difference between the two is used to generate a phase-shift duty ratio D by a PI controller1，D1＝kp(Voref-Vbus)+ki∫(Voref-Vbus) dt; wherein k isp，kiRespectively, the proportional and integral parameters of the PI controller.
6. The power supply method of the island special energy router as claimed in claim 2, wherein the control modes of the bidirectional DAB include voltage stabilization control, charging control and starting control; wherein: the voltage stabilization control formula is as follows:
Figure FDA0002283990820000021
D2-1is the preceding phase shift duty ratio of the energy storage unit, D2-2Is the phase-shift duty ratio of the energy storage unit at the later stage, D2-3Is the duty ratio of the external phase shift of the energy storage unit; k is a radical ofp，kiRespectively representing proportional and integral parameters of the PI controller; vorefIs a direct current bus voltage reference value; vbusThe actual value of the voltage of the direct current bus is obtained;
the charge control formula is as follows:
Figure FDA0002283990820000022
Vboutputting an actual value for the energy storage unit; f. ofopA transformation function representing an optimization algorithm;
the start-up control formula is as follows: d2-1＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt。
7. The method of claim 2, wherein the pv array control process comprises:
MPPT control: according to photovoltaic output power PvAnd an output voltage VpvCalculating the output voltage reference value V of the photovoltaic array by adopting MPPT algorithmpvrefAnd the photovoltaic actual voltage VpvAfter the difference is made, a phase-shift duty ratio D is generated by a controllerpv：
Dpv＝kp(Vpvref-Vpv)+ki∫(Vpvref-Vpv)dt；
Vpvref＝fMPPT(Pv,Vpv)；
Wherein f isMPPTIndicating MPPTransformation function of the T algorithm, kp，kiRespectively representing proportional and integral parameters of the PI controller;
constant voltage control: using a DC side bus voltage reference value VorefAs a control command value, the actual value V of the DC bus voltagebusAs a feedback value, the difference between the two is calculated by a PI controller to obtain a phase-shift duty ratio Dpv；Dpv＝kp(Voref-Vbus)+ki∫(Voref-Vbus)dt。
8. The power supply method of the island special energy router according to claim 1, wherein the virtual synchronization control method of the PWM inverter comprises: calculating output voltage u of alternating current control unit through phase-locked loopsThen in conjunction with the AC bus voltage amplitude VACCalculating the output voltage reference value u of the PWM inverteracrefThe calculated voltage reference value uacrefAnd the actual output voltage u of the PWM inverteracMaking a difference, and obtaining the duty ratio D of the PWM inverter by the PI controller3：D3＝kp(uacref-uac)+ki∫(uacref-uac) dt; wherein u isacref＝VACsin(ωt+θ)；kp，kiRespectively representing the proportional and integral parameters of the PI controller.
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