CN112803458A - Current sharing control method for solar station and parallel inverter power supply - Google Patents

Current sharing control method for solar station and parallel inverter power supply Download PDF

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Publication number
CN112803458A
CN112803458A CN202110040614.2A CN202110040614A CN112803458A CN 112803458 A CN112803458 A CN 112803458A CN 202110040614 A CN202110040614 A CN 202110040614A CN 112803458 A CN112803458 A CN 112803458A
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control
inverter power
loop
voltage
current
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CN112803458B (en
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侯健敏
徐志豪
余威杰
周颖
路新梅
丁苏云
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/51—Photovoltaic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/67—Controlling two or more charging stations
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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

Abstract

本发明公开了一种太阳能车站及并联逆变电源均流控制方法，该车站包括太阳能光伏板、蓄电池储能系统、逆变电源控制系统、手机充电桩和显示屏，太阳能光伏板与手机充电桩和蓄电池储能系统相连，太阳能光伏板发电直接供给所述手机充电桩使用，剩余电能转送到所述蓄电池储能系统中，蓄电池储能系统通过逆变电源控制系统进行并联均流后为手机充电桩和显示屏供电。本发明既保证用电设备安全稳定的运行，也避免了当多余电能上网时带来的电网电压的波动。既能充分合理利用能源，也可以保证用电电压电流的稳定平衡。

Figure 202110040614

The invention discloses a solar power station and a method for controlling the current sharing of parallel inverter power sources. The station includes a solar photovoltaic panel, a battery energy storage system, an inverter power control system, a mobile phone charging pile and a display screen, and the solar photovoltaic panel and the mobile phone charging pile. Connected to the battery energy storage system, the solar photovoltaic panels generate electricity directly for use by the mobile phone charging pile, and the remaining electric energy is transferred to the battery energy storage system, which charges the mobile phone after parallel current sharing through the inverter power control system. Pile and display powered. The invention not only ensures the safe and stable operation of the electric equipment, but also avoids the fluctuation of the grid voltage when the excess electric energy is connected to the grid. It can not only make full and reasonable use of energy, but also ensure the stable balance of voltage and current of electricity.

Figure 202110040614

Description

Current sharing control method for solar station and parallel inverter power supply
Technical Field
The invention relates to a distributed energy power supply control method, in particular to a current sharing control method for a solar vehicle station and a parallel inverter power supply.
Background
Solar photovoltaic power generation technology is widely used nowadays, and with the aggravation of energy problems, the advantages of solar photovoltaic power generation are increasingly obvious. The number of solar energy stations is also increasing with the development of cities.
When the solar vehicle stands in the daytime to perform photovoltaic power generation, most of photovoltaic power generation is consumed by the station, and part of electric quantity is still not used. If the small part of the electric energy is transmitted to the power grid in a networking way, although the electric energy generated by the solar photovoltaic panel can be fully utilized, a plurality of negative effects such as increased networking cost, fluctuation of power quality of the power grid and the like can be caused at the same time. If this part of the surplus electric energy is neglected, the energy use efficiency is lowered, resulting in waste. Therefore, it is very important to store the surplus electric energy by using the storage battery.
After the solar photovoltaic panel generates electricity, the generated direct current can be directly stored into a plurality of energy storage batteries which are used in parallel. However, when the electric energy in the energy storage batteries needs to be used, an inverter bridge needs to be adopted, and the direct current is converted into alternating current through an inverter circuit and is supplied to a station or a user for use. When a plurality of inverter power supplies are used in parallel, because of the difference among the parameters of each inverter power supply, the imbalance of the output voltage and current of each inverter power supply can cause the generation of circulation current in a circuit, the existence of the circulation current can lead the quality of the output electric energy of the power supply to be reduced, the electric energy utilization rate to be reduced, and the service life of a load is influenced.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides the solar vehicle station and the parallel inverter power supply current sharing control method, which can well inhibit the circulation current in the parallel circuit, improve the stability of the output voltage and the output current of the parallel inverter power supply system, ensure that the output three-phase voltage and the output three-phase current can keep the stable balance of the amplitude and the phase, and ensure the power quality.
The technical scheme is as follows: the technical scheme is that the solar energy vehicle station comprises a solar photovoltaic panel, a storage battery energy storage system, an inverter power supply control system, a mobile phone charging pile and a display screen, wherein the solar photovoltaic panel is connected with the mobile phone charging pile and the storage battery energy storage system, the solar photovoltaic panel generates electricity and is directly supplied to the mobile phone charging pile for use, the rest of the electricity is transferred to the storage battery energy storage system, the storage battery energy storage system supplies electricity to the mobile phone charging pile and the display screen after parallel current sharing through the inverter power supply control system, the inverter power supply control system comprises at least two inverter power supplies which are connected in parallel, one of the inverter power supplies serves as a master control, and the rest of the inverter power supplies serve; the parallel current sharing through the inverter power supply control system means that the feedback control of the output voltage of the inverter power supply is used as the outer ring of a control circuit, the feedback control of the output current of the inverter power supply is used as the inner ring of the control circuit, and the output of a single inverter power supply is regulated for one time through the double-ring control of the voltage and the current; simultaneously, the signals of the output voltage of the inverter power supply in the master control and the reference voltage after voltage modulation are used as the input signals of the inner ring of the inverter power supply control circuit of the slave control, and the output of a system consisting of a plurality of inverter power supplies is secondarily regulated; the control circuit outer loop is omitted from the control.
The open loop transfer function of the control circuit outer loop feedback control is as follows:
Figure BDA0002893973460000021
wherein T isvFor controlling the outer loop sampling time constant, KvIs the proportionality coefficient of the voltage ring, TevC is the capacitance value of the LC filter circuit for controlling the circuit outer ring reference time constant.
The open loop transfer function of the feedback control of the inner loop of the control circuit is as follows:
Figure BDA0002893973460000022
wherein T issTime constant, K, for sampling and feedback in control circuitsPWMIs the equivalent gain of the bridge PWM; t issIs the inertia constant, tau, of the switching converteriIs the ratio of the inductance of the LC filter circuit to the resistance of the voltage outer loop, KipThe product of the current loop proportionality coefficient and the integral coefficient, and R is the inner loop circuit resistance.
The solar car station also comprises a water tank, wherein the water tank comprises an upper water tank and a lower water tank, the upper water tank is connected with the solar photovoltaic panel, is arranged above the solar photovoltaic panel and is used for cleaning dust and particles on the surface of the solar photovoltaic panel; the lower water tank is arranged at the edge of the station ceiling, and the two sides of the lower water tank are provided with openings for draining water.
The display screen adopts an LED display screen and is used for displaying the percentage of the residual electric energy in the storage battery energy storage system.
The mobile phone charging pile is arranged on a stand column of a station, and the storage battery energy storage system and the inverter power supply control system are arranged underground below the station.
Correspondingly, the invention provides a current sharing control method for parallel inverter power supplies, which comprises the following steps:
s1: taking feedback control of output voltage of the inverter power supply as an outer ring of a control circuit, and taking feedback control of output current of the inverter power supply as an inner ring of the control circuit; one of the inverter power supplies is used as a master control, and the other inverter power supplies are used as slave controls;
s2: the reference voltage and the sampling voltage are used as the input of an outer ring of a control circuit in the main control, and a signal is obtained through the feedback control of a voltage regulator;
s3: omitting the outer loop of the control circuit from the control, inputting the signal obtained in the step S2 as the reference current of the inner loop of the control circuit from the control, and carrying out feedback control on the sampled current from the control through a current regulator to obtain a modulated wave;
s4: adding the obtained modulation wave and a carrier wave and converting the modulation wave and the carrier wave into a PWM signal to obtain a driving wave which is used for driving an inverter power supply to realize a current sharing effect;
the sampling voltage is the output voltage of the inverter power supply in the master control, and the sampling current is the output current of the inverter power supply in the slave control.
The open loop transfer function of the control circuit outer loop feedback control is as follows:
Figure BDA0002893973460000023
wherein T isvFor controlling the outer loop sampling time constant, KvIs the proportionality coefficient of the voltage ring, TevC is the capacitance value of the LC filter circuit for controlling the circuit outer ring reference time constant.
The open loop transfer function of the feedback control of the inner loop of the control circuit is as follows:
Figure BDA0002893973460000031
wherein T issTime constant, K, for sampling and feedback in control circuitsPWMIs the equivalent gain of the bridge PWM; t issIs the inertia constant, tau, of the switching converteriIs the ratio of the inductance of the LC filter circuit to the resistance of the voltage outer loop, KipThe product of the current loop proportionality coefficient and the integral coefficient, and R is the inner loop circuit resistance.
Before the sampling voltage and the sampling current are input, Clark transformation is carried out on the sampling voltage and the sampling current, and signals under a three-phase lower coordinate axis are converted into signals under a two-phase stationary coordinate axis; similarly, the preset reference voltage needs to be input into the voltage control loop after clark transformation. Before finally generating the driving wave to drive the inverter bridge, the signals under the two-phase stationary coordinate axis need to be converted into the signals under the three-phase coordinate axis again.
Has the advantages that: compared with the prior art, the invention has the following advantages: (1) the solar energy station stores the residual electric energy of the solar photovoltaic panel through the energy storage system, so that on one hand, the fluctuation of voltage and current caused by the partial electric energy during surfing the Internet is avoided, and on the other hand, the electric energy waste is reduced. (2) Solar energy station is equipped with display screen and cell-phone and fills electric pile, and make full use of solar photovoltaic board provides electric power for the station. (3) The invention adopts the inverter power supply control system of the voltage-current double-loop control strategy based on the master-slave control idea, and simultaneously, the current inner loop also plays a role in accelerating the dynamic phase response, so that the dynamic response of the system is quicker. The current sharing method can effectively inhibit and eliminate the circulation current existing in the system when a plurality of energy storage batteries are used in parallel, realize the aim of parallel current sharing, improve the quality of electric energy, maintain the stability of output voltage and ensure the safe and stable operation of electric equipment.
Drawings
FIG. 1 is a schematic flow chart of a current-sharing control method for parallel inverter power supplies according to the present invention;
fig. 2 is a block diagram of a master-slave control circuit in the inverter control system according to the present invention;
FIG. 3 is a block diagram of a solar energy station according to the present invention;
fig. 4 is a schematic structural view of a solar energy station according to the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The solar station module is shown in figure 3 and comprises a solar photovoltaic panel, a storage battery energy storage system, an inverter power supply control system, a mobile phone charging pile and an LED display screen. The solar photovoltaic panel is connected with the mobile phone charging pile and the storage battery energy storage system, after the solar photovoltaic panel generates electricity, most of electric energy is converted by the DC/AC converter and then directly supplied to the mobile phone charging pile for use, and the rest electric energy is transferred to the storage battery energy storage system. The storage battery energy storage system supplies power to the mobile phone charging pile and the LED display screen through the inverter power supply control system, and is used for storing redundant electric energy, improving the utilization rate of energy sources and ensuring that the power consumption demand of a user is met. When the mobile phone charging pile and the LED display screen need to use electric energy in the storage battery energy storage system, the electric energy is sent out from the storage battery energy storage system, and is supplied to the mobile phone charging pile and the LED display screen for use after being connected in parallel and equalized by the inverter power supply control system.
The inverter power control system generally includes an inverter and a filter, and the inverter converts direct current generated by the storage battery energy storage system into alternating current, and then the alternating current is filtered and supplied to a load for use. The inverter power supply control system at least comprises two inverter power supplies which are connected in parallel, but when direct current stored in a plurality of energy storage batteries which are used in parallel is converted into alternating current through an inverter circuit to be supplied to users for use, the problem of unbalanced amplitude and phase of output voltage and output current of the system can be caused due to the fact that the circulating current exists in the system caused by unbalanced circuit parameters. In order to solve the problems, the invention provides a master-slave control idea-based inverter power supply parallel current-sharing control strategy for voltage and current double-loop control, which is applied to a solar station and an energy storage system thereof. By using the scheme, the circulation current in the parallel circuit can be well caused
Figure BDA0002893973460000041
The circulating current in the parallel circuit is restrained, the stability of the output voltage and the output current of the parallel inverter power supply system is improved, the output three-phase voltage and the output three-phase current can keep the stable balance of the amplitude and the phase, and the electric energy quality is ensured. Wherein
Figure BDA0002893973460000042
In order to circulate current in the electric circuit,
Figure BDA0002893973460000043
and n is the number of single inverter power supplies in the whole system.
The inverter control system mainly adopts a voltage and current double-loop control strategy based on a master-slave control idea. The output voltage of a single inverter power supply can be regulated once through voltage and current double-loop control. The output voltage of a system consisting of a plurality of inverter power supplies can be secondarily regulated through a master-slave control scheme. The master-slave control scheme can avoid the breakdown of the whole circuit caused by the failure of one inverter power supply loop, and reduce the errors caused by different parameters of each inverter power supply. By adopting a voltage and current double-loop control strategy, the system response speed can be higher, the circulation can be well restrained and eliminated, the parallel current sharing target is realized, the electric energy quality is improved, the output voltage is maintained to be stable, and the safe and stable operation of electric equipment is ensured.
Fig. 2 is a block diagram of the master-slave control circuit, which is simplified by using one master and one slave as an example. The function of the slave machine is only to provide current sharing control, the master machine is equivalent to a voltage source, and the slave machine is equivalent to a current source.
Compared with the control module of the master machine, the control module of the whole slave machine lacks an output voltage sampling part and a reference voltage setting part, and replaces two master machine signals. These two host signals serve as the output values of the host voltage loop.
The two master signals are directly added to the current inner ring of the slave and serve as input signals of the current inner ring of the slave. In this case, the slave only acts as a current sharing control function, since the voltage outer loop in the control loop is omitted.
The input reference value of the slave machine current loop is a signal sent by the master machine, so that the synchronization of the signals between the master machine and the slave machine can be better realized, and the circulation caused by the asynchronous data signals between the two inverter power supplies is avoided.
Before the sampling voltage and the sampling current are input, Clark (Clark) conversion is carried out on the sampling voltage and the sampling current, and signals under three-phase lower coordinate [ a, b, c ] axes can be converted into signals under two-phase stationary coordinate [ alpha, beta ] axes through the Clark conversion. Through Clark conversion, the required host signals are reduced from three to two, thereby saving the system space and improving the stability of the system. Similarly, the preset reference voltage needs to be input into the voltage control loop after clark transformation. Before finally generating the driving wave to drive the inverter bridge, the signals under the two-phase stationary coordinate axis need to be converted into the signals under the three-phase coordinate axis again.
For the situation of more than two inverter power supplies, one inverter power supply is used as a master control, the other inverter power supplies are used as slave controls, a feedback control circuit of the inverter power supply is the same as a slave control circuit in the figure 2, and an input reference value of a slave current loop is a signal sent by a master machine.
Fig. 4 is a schematic structural view of the solar energy vehicle station according to the present invention. The upper water tank 11 is connected with the solar photovoltaic panel 3, is arranged above the solar photovoltaic panel 3 and is used for cleaning dust and particles on the surface of the solar photovoltaic panel 3. The lower water tank 12 is arranged at the edge of the station ceiling and below the solar photovoltaic panel 3, and openings are formed in the two ends of the lower water tank for facilitating drainage, so that the safety and sanitation of the station are guaranteed. The LED display screen 2 is connected with the storage battery energy storage system 6 and can display the percentage of the residual electric energy in the storage battery energy storage system 6. The solar photovoltaic panel 3 is installed above the station ceiling to receive solar energy and is used for producing electric energy. The mobile phone charging pile 4 is connected with the storage battery energy storage system 6 and the solar photovoltaic panel 3 and used for supplying power to users. The inverter power supply control system 5 is connected with the energy storage system and is used for improving the quality of the electric energy generated by the storage battery energy storage system 6 and inhibiting circulation. The battery energy storage system 6 is installed underground for storing the remaining electric energy.
Fig. 1 is a schematic flow chart of the current sharing control method for the parallel inverter power supply, which includes the following steps:
s1: the instantaneous feedback control of the output voltage of the inverter power supply is used as the outer loop of the circuit, and the instantaneous feedback of the output current of the inverter power supply is used as the inner loop of the circuit.
S2: the reference voltage VC and the sampling voltage V are used as the input of the voltage outer ring, and the signal is obtained after the feedback control processing of the voltage regulator.
S3: and inputting a signal at the output of the voltage regulator into an IC (integrated circuit) as a reference current of a current inner loop, and performing feedback control processing on the signal and the sampling current I through the current regulator to obtain a modulation wave.
S4: at this time, a desired voltage and current are obtained, and the obtained modulation wave is added with a carrier wave and converted into a PWM signal to obtain a driving wave for driving an inverter bridge in an inverter.
The sampling voltage is the output voltage of the inverter power supply in the master control, and the sampling current is the output current of the inverter power supply in the slave control.
The voltage outer ring and the current inner ring are both controlled by adopting PI, and the open-loop transfer function of the current inner ring is as follows:
Figure BDA0002893973460000051
wherein T issTime constant, K, for current inner loop sampling and feedbackPWMIs the equivalent gain of the bridge PWM; t issIs the inertia constant, tau, of the switching converteriIs the ratio of the inductance of the LC filter circuit to the resistance of the voltage outer loop, KipThe product of the current loop proportionality coefficient and the integral coefficient, and R is the inner loop circuit resistance.
The open loop transfer function of the voltage outer loop is:
Figure BDA0002893973460000052
wherein T isvSampling the time constant, K, for the outer loop of the voltagevIs the proportionality coefficient of the voltage ring, TevIs the voltage outer loop reference time constant. And C is the capacitance value in the LC filter circuit.
Meanwhile, the current inner ring also plays a role in accelerating dynamic phase response, so that the dynamic response of the system is quicker.
The invention not only ensures the safe and stable operation of the electric equipment, but also avoids the fluctuation of the power grid voltage brought by the excessive electric energy when the network is accessed. The energy can be fully and reasonably utilized, and the stable balance of the voltage and the current can be ensured.

Claims (10)

1.一种太阳能车站，其特征在于：包括太阳能光伏板、蓄电池储能系统、逆变电源控制系统、手机充电桩和显示屏，太阳能光伏板与手机充电桩和蓄电池储能系统相连，太阳能光伏板所发电量通过DC-AC变换器直接供给所述手机充电桩使用，剩余电能转送到所述蓄电池储能系统中，蓄电池储能系统通过逆变电源控制系统进行并联均流后为手机充电桩和显示屏供电，所述逆变电源控制系统包括至少两个并联的逆变电源，将其中一个逆变电源作为主控制，其余逆变电源作为从控制；所述通过逆变电源控制系统进行并联均流是指以逆变电源的输出电压的反馈控制作为控制电路外环，以逆变电源的输出电流的反馈控制作为控制电路内环，通过电压电流双环控制对单个逆变电源输出进行一次调节；同时将主控制中逆变电源的输出电压和参考电压经电压调制后的信号作为从控制中逆变电源的控制电路内环的输入信号，对多个逆变电源组成的系统的输出进行二次调节；从控制中省去控制电路外环。1. A solar station is characterized in that: comprising a solar photovoltaic panel, a battery energy storage system, an inverter power control system, a mobile phone charging pile and a display screen, the solar photovoltaic panel is connected with the mobile phone charging pile and the battery energy storage system, and the solar photovoltaic The power generated by the board is directly supplied to the mobile phone charging pile through the DC-AC converter, and the remaining electric energy is transferred to the battery energy storage system. and the display screen, the inverter power control system includes at least two parallel inverter power sources, one of which is used as the master control, and the other inverter power sources are used as slave controls; the parallel connection is performed through the inverter power control system Current sharing means that the feedback control of the output voltage of the inverter power supply is used as the outer loop of the control circuit, and the feedback control of the output current of the inverter power supply is used as the inner loop of the control circuit, and the output of a single inverter power supply is adjusted once through the voltage and current double-loop control. At the same time, the output voltage of the inverter power supply in the master control and the voltage-modulated signal of the reference voltage are used as the input signal of the inner loop of the control circuit of the inverter power supply in the slave control, and the output of the system composed of multiple inverter power supplies is divided into two. secondary regulation; the control circuit outer loop is omitted from the control. 2.根据权利要求1所述的太阳能车站，其特征在于，所述控制电路外环反馈控制的开环传递函数为：2. The solar station according to claim 1, wherein the open-loop transfer function of the outer-loop feedback control of the control circuit is:
Figure FDA0002893973450000011
Figure FDA0002893973450000011
 其中Tv为控制电路外环采样时间常数，Kv为电压环的比例系数，Tev为控制电路外环参考时间常数，C为LC滤波电路电容值。Among them, T v is the sampling time constant of the outer loop of the control circuit, K v is the proportional coefficient of the voltage loop, T ev is the reference time constant of the outer loop of the control circuit, and C is the capacitance value of the LC filter circuit. 3.根据权利要求1所述的太阳能车站，其特征在于，所述控制电路内环反馈控制的开环传递函数为：3. The solar station according to claim 1, wherein the open-loop transfer function of the inner-loop feedback control of the control circuit is:
Figure FDA0002893973450000012
Figure FDA0002893973450000012
 其中Ts为控制电路内环采样和反馈的时间常数，KPWM是桥路PWM的等效增益；Ts是开关变换器的惯性常数，τi为LC滤波电路电感值与电压外环电阻的比值，Kip为电流环比例系数和积分系数的乘积，R为内环电路电阻。where T s is the time constant of sampling and feedback in the inner loop of the control circuit, K PWM is the equivalent gain of bridge PWM; T s is the inertia constant of the switching converter, τ i is the difference between the inductance value of the LC filter circuit and the voltage outer loop resistance ratio, K ip is the product of the current loop proportional coefficient and integral coefficient, and R is the inner loop circuit resistance. 4.根据权利要求1所述的太阳能车站，其特征在于：所述太阳能车站还包括水槽，所述水槽包括上方水槽和下方水槽，上方水槽与太阳能光伏板相连，安装于太阳能光伏板上方，用于清洁太阳能光伏板表面灰尘及颗粒物；下方水槽设于车站顶棚边沿，两侧开口，用于排水。4. The solar station according to claim 1, wherein the solar station further comprises a water tank, the water tank comprises an upper water tank and a lower water tank, the upper water tank is connected to the solar photovoltaic panel, installed above the solar photovoltaic panel, and used for It is used to clean dust and particles on the surface of solar photovoltaic panels; the lower water tank is set on the edge of the roof of the station, with openings on both sides for drainage. 5.根据权利要求1所述的太阳能车站，其特征在于：所述显示屏采用LED显示屏，用于显示蓄电池储能系统中剩余电能百分比。5 . The solar station according to claim 1 , wherein the display screen adopts an LED display screen, which is used to display the percentage of remaining electric energy in the battery energy storage system. 6 . 6.根据权利要求1所述的太阳能车站，其特征在于：所述手机充电桩设于车站的立柱上，所述蓄电池储能系统以及所述逆变电源控制系统安装于车站下方地下。6 . The solar station according to claim 1 , wherein the mobile phone charging pile is installed on a column of the station, and the battery energy storage system and the inverter power control system are installed underground below the station. 7 . 7.一种并联逆变电源均流控制方法，应用于含有至少两个并联的逆变电源的控制电路，其特征在于，包括以下步骤：7. A current sharing control method for parallel inverter power sources, applied to a control circuit containing at least two parallel inverter power sources, characterized in that it comprises the following steps: S1：以逆变电源的输出电压的反馈控制作为控制电路外环，以逆变电源的输出电流的反馈控制作为控制电路内环；将其中一个逆变电源作为主控制，其余逆变电源为从控制；S1: The feedback control of the output voltage of the inverter power supply is used as the outer loop of the control circuit, and the feedback control of the output current of the inverter power supply is used as the inner loop of the control circuit; one of the inverter power supplies is used as the main control, and the rest of the inverter power supplies are slaves. control; S2：通过参考电压和采样电压作为主控制中的控制电路外环的输入，经过电压调节器反馈控制得到信号；S2: The reference voltage and the sampled voltage are used as the input of the outer loop of the control circuit in the main control, and the signal is obtained through the feedback control of the voltage regulator; S3：从控制中省去控制电路外环，将步骤S2中得到的信号作为从控制中控制电路内环的参考电流输入，与从控制中采样电流经电流调节器进行反馈控制，得到调制波；S3: The outer loop of the control circuit is omitted from the control, and the signal obtained in step S2 is used as the reference current input of the inner loop of the control circuit from the control, and feedback control is performed with the current sampled from the control through the current regulator to obtain a modulated wave; S4：再将得到的调制波与载波相加并转换为PWM信号得到驱动波，用来驱动逆变电源，实现均流作用；S4: Add the obtained modulated wave and the carrier wave and convert it into a PWM signal to obtain a driving wave, which is used to drive the inverter power supply to achieve current sharing; 其中，采样电压为主控制中逆变电源的输出电压，采样电流为从控制中逆变电源的输出电流。Among them, the sampling voltage is the output voltage of the inverter power supply in the master control, and the sampling current is the output current of the inverter power supply in the slave control. 8.根据权利要求7所述的并联逆变电源均流控制方法，其特征在于，控制电路外环反馈控制的开环传递函数为：8. The current sharing control method for parallel inverter power sources according to claim 7, wherein the open-loop transfer function of the outer-loop feedback control of the control circuit is:
Figure FDA0002893973450000021
Figure FDA0002893973450000021
 其中Tv为控制电路外环采样时间常数，Kv为电压环的比例系数，Tev为控制电路外环参考时间常数，C为LC滤波电路电容值。Among them, T v is the sampling time constant of the outer loop of the control circuit, K v is the proportional coefficient of the voltage loop, T ev is the reference time constant of the outer loop of the control circuit, and C is the capacitance value of the LC filter circuit. 9.根据权利要求7所述的并联逆变电源均流控制方法，其特征在于，控制电路内环反馈控制的开环传递函数为：9. The current sharing control method for parallel inverter power sources according to claim 7, wherein the open-loop transfer function of the inner-loop feedback control of the control circuit is:
Figure FDA0002893973450000022
Figure FDA0002893973450000022
 其中Ts为控制电路内环采样和反馈的时间常数，KPWM是桥路PWM的等效增益；Ts是开关变换器的惯性常数，τi为LC滤波电路电感值与电压外环电阻的比值，Kip为电流环比例系数和积分系数的乘积，R为内环电路电阻。where T s is the time constant of sampling and feedback in the inner loop of the control circuit, K PWM is the equivalent gain of bridge PWM; T s is the inertia constant of the switching converter, τ i is the difference between the inductance value of the LC filter circuit and the voltage outer loop resistance ratio, K ip is the product of the current loop proportional coefficient and integral coefficient, and R is the inner loop circuit resistance. 10.根据权利要求7所述的并联逆变电源均流控制方法，其特征在于：在输入采样电压和采样电流前，先对采样电压和采样电流进行克拉克变换，将三相下坐标轴下的信号转换成两相静止坐标轴下的信号；同样的，预先设置的参考电压也需要经过克拉克变换后再输入到电压控制环中。在最终生成驱动波驱动逆变桥前，需要再将两相静止坐标轴下的信号，重新转换成三相坐标轴下信号。10. The current sharing control method of parallel inverter power supply according to claim 7, it is characterized in that: before inputting sampling voltage and sampling current, first carry out Clark transform to sampling voltage and sampling current, change the three-phase lower coordinate axis under the coordinate axis. The signal is converted into a signal under the two-phase stationary coordinate axis; similarly, the preset reference voltage also needs to be transformed into the voltage control loop after Clark transformation. Before finally generating the driving wave to drive the inverter bridge, it is necessary to reconvert the signal under the two-phase stationary coordinate axis into the signal under the three-phase coordinate axis.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113306403A (en) * 2021-07-14 2021-08-27 南通大学 Light storage and drive system model prediction control method for solar electric automobile
CN113555903A (en) * 2021-07-30 2021-10-26 阳光电源股份有限公司 Microgrid and microgrid control method
CN113572381A (en) * 2021-07-19 2021-10-29 平高集团有限公司 Energy conversion device of micro-grid

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103840548A (en) * 2014-03-31 2014-06-04 国网上海市电力公司 Transformer substation system with microgrid system
CN104578126A (en) * 2015-01-30 2015-04-29 阳光电源股份有限公司 Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters
CN105207341A (en) * 2015-09-17 2015-12-30 同济大学 Grid-connected and off-grid type photovoltaic energy-storage charging pile control device and method
US20160006364A1 (en) * 2013-03-04 2016-01-07 State Grid Corporation Of China System and method for controlling pcs voltage and frequency
CN105634087A (en) * 2016-01-19 2016-06-01 郭文林 Integrated new energy charging station
CN106505615A (en) * 2016-11-16 2017-03-15 常州天合光能有限公司 A power supply system for electric vehicle charging station based on independent microgrid
CN111740439A (en) * 2020-08-04 2020-10-02 江苏慧智能源工程技术创新研究院有限公司 Control method based on light storage and charging integrated micro-grid system
CN112072716A (en) * 2020-09-10 2020-12-11 湖南科技大学 Power distribution network terminal electric energy router and control method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160006364A1 (en) * 2013-03-04 2016-01-07 State Grid Corporation Of China System and method for controlling pcs voltage and frequency
CN103840548A (en) * 2014-03-31 2014-06-04 国网上海市电力公司 Transformer substation system with microgrid system
CN104578126A (en) * 2015-01-30 2015-04-29 阳光电源股份有限公司 Micro-grid system and seamless grid connection/disconnection switching method for energy storage converters
CN105207341A (en) * 2015-09-17 2015-12-30 同济大学 Grid-connected and off-grid type photovoltaic energy-storage charging pile control device and method
CN105634087A (en) * 2016-01-19 2016-06-01 郭文林 Integrated new energy charging station
CN106505615A (en) * 2016-11-16 2017-03-15 常州天合光能有限公司 A power supply system for electric vehicle charging station based on independent microgrid
CN111740439A (en) * 2020-08-04 2020-10-02 江苏慧智能源工程技术创新研究院有限公司 Control method based on light storage and charging integrated micro-grid system
CN112072716A (en) * 2020-09-10 2020-12-11 湖南科技大学 Power distribution network terminal electric energy router and control method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
曹鸿: "400Hz逆变器控制和并联技术研究", 《中国优秀硕士学位论文全文数据库》, pages 35 - 41 *
甄晓亚: "多目标控制并联型电压暂降恢复的研究", 《中国优秀硕士学位论文全文数据库》, pages 16 - 32 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113306403A (en) * 2021-07-14 2021-08-27 南通大学 Light storage and drive system model prediction control method for solar electric automobile
CN113306403B (en) * 2021-07-14 2024-04-05 南通大学 Solar electric vehicle light storage and drive system model predictive control method
CN113572381A (en) * 2021-07-19 2021-10-29 平高集团有限公司 Energy conversion device of micro-grid
CN113572381B (en) * 2021-07-19 2023-03-07 平高集团有限公司 Energy conversion device of micro-grid
CN113555903A (en) * 2021-07-30 2021-10-26 阳光电源股份有限公司 Microgrid and microgrid control method
CN113555903B (en) * 2021-07-30 2024-04-12 阳光电源股份有限公司 Micro-grid and micro-grid control method

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