CN111668849A - Line voltage compensation system based on energy storage module and inverter power supply - Google Patents

Line voltage compensation system based on energy storage module and inverter power supply Download PDF

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Publication number
CN111668849A
CN111668849A CN202010596625.4A CN202010596625A CN111668849A CN 111668849 A CN111668849 A CN 111668849A CN 202010596625 A CN202010596625 A CN 202010596625A CN 111668849 A CN111668849 A CN 111668849A
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compensation
module
voltage
energy
energy storage
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Chinese (zh)
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徐国卿
武慧莉
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University of Shanghai for Science and Technology
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University of Shanghai for 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • 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
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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

Abstract

The invention discloses a line voltage compensation system based on power supply of an energy storage module and an inverter. The system comprises: the device comprises a compensation inverter module, a compensation transformer, an energy storage and conversion module and an integrated control communication module. The invention generates voltage with controllable amplitude and phase through the compensation inverter module, and injects the voltage into the power transmission line to realize full-phase voltage compensation. The SVG power supply device is combined with an SVG device with reactive, harmonic and three-phase unbalance compensation functions, so that the voltage and power quality comprehensive compensation of a distribution line can be realized, and the power supply radius can be effectively extended; the invention designs the energy storage and conversion module to be connected in parallel to the power supply circuit aiming at the problem of limiting the energy source of the direct current side which is widely applied by the controllable series compensation device, thereby not only realizing the adjustment of the peak-valley load balance of the power grid, but also being used as an energy extraction circuit of the compensation inverter module and providing stable and sufficient energy source support for the voltage compensation process.

Description

Line voltage compensation system based on energy storage module and inverter power supply
Technical Field
The invention relates to the field of power supply or power distribution, in particular to a line voltage compensation system based on power supply of an energy storage module and an inverter.
Background
The problems that power grid companies face all over the world are that power grid construction in load-dispersed areas is poor in economic benefit and low in input-output ratio, and how to provide suitable power supply services for population in the load-dispersed areas in an economic mode becomes a global hot topic. With the gradual development and construction of new energy electric fields in inner Mongolia, Gansu, Xinjiang and coastal areas, wind power and photovoltaic power generation become a novel environment-friendly energy supply scheme advocated by society, but the fluctuation and intermittence of new energy electric power and the consumption capacity of a power grid cause the practical application of a distributed power generation system to be limited and the phenomena of wind and light abandonment to occur. The problems that the power supply voltage at the tail end of a line is low and the power quality is unqualified easily occur due to large load power fluctuation caused by living habits of power users, a steep rise and a steep drop phenomenon exist, the load is dispersed, the power transmission distance is long, and the problems that the power supply voltage at the tail end of the line is low and the power quality is unqualified exist easily exist.
The voltage drop is one of the root causes of limitation of power supply radius in load dispersion areas, so that the problem of improving the voltage quality of a distribution network by a technical means is one of key technologies for effectively extending the power supply radius. With the rapid development of power electronic technology, a controllable series-parallel compensation device becomes a hotspot in research and application fields. Based on the active inversion principle, injecting voltage with controllable amplitude and phase to a power grid through a power electronic converter is one of the main ways for realizing voltage compensation, but this way inevitably requires a large amount of energy source support, and especially in a power supply and distribution network with dispersed load, the current required by the load during the load peak period is large, the voltage drop is serious and the duration is long, if the full-phase voltage compensation (also called complete voltage compensation) with optimal compensation performance is to be realized, namely, it is expected that the full-phase voltage compensation is consistent with the voltage before the drop occurs, a large amount of energy support is required, the capacity of a direct current side capacitor is not enough to support, and the manufacturing and operating costs of equipment with larger capacity are higher, so the direct current side energy source of most controllable series-parallel compensation equipment at the present stage is still a key problem limiting the large-scale application of the controllable.
Disclosure of Invention
The invention aims to provide a line voltage compensation system based on power supply of an energy storage module and an inverter, which is used for solving the problem of high energy requirement in the voltage compensation process and has the function of regulating load peak-valley balance.
In order to achieve the purpose, the invention provides the following scheme:
a line voltage compensation system based on energy storage module and inverter powering, comprising: the system comprises a compensation inverter module, a compensation transformer, an energy storage and conversion module and an integrated control communication module;
the compensation inverter module generates compensation voltage with controllable amplitude and phase through closed-loop control and outputs the compensation voltage to a primary side winding of the compensation transformer;
the secondary side winding of the compensation transformer is connected in series in a power supply line, the primary side winding of the compensation transformer is connected with the output end of the compensation inverter module on the alternating current side, and the compensation transformer is used for coupling the compensation voltage into the power supply line to realize voltage compensation;
the energy storage and conversion module is connected in parallel in a power supply line, and a direct current output port of the energy storage and conversion module is connected with a direct current side input end of the compensation inverter module and used for providing an energy source for the compensation inverter module and realizing peak-valley balance adjustment of a power grid;
the integrated control communication module is connected with the power supply line, the compensating inverter module and the energy storage and conversion module, and is used for detecting and processing voltage and current information of the power supply line, outputting the voltage and current information to the compensating inverter module and the energy storage and conversion module, and simultaneously realizing communication between the compensating inverter module and the energy storage and conversion module.
Optionally, the buck inverter module includes: a voltage generator and a first control unit;
the first control unit is respectively connected with the voltage generator and the integrated control communication module, and is used for determining the working state of the compensation inverter module according to the voltage and current information of the power supply line output by the integrated control communication module and the running state information of the energy storage and conversion module, generating a first on-off control signal and outputting the first on-off control signal to the voltage generator.
And the alternating current side output end of the voltage generator is connected with the primary side winding of the compensation transformer, and the direct current side input end of the voltage generator is connected with the direct current output port of the energy storage and conversion module and is used for finishing the conversion of direct current-alternating current energy according to the first on-off control signal and generating voltage required by compensation and outputting the voltage to the primary side winding of the compensation transformer.
Optionally, the voltage generator adopts a three-phase inverter circuit.
Optionally, the voltage generator adopts a three-phase inverter circuit with a DC input terminal including a DC/DC conversion circuit.
Optionally, the energy storage and conversion module includes: the system comprises a grid-connected converter, a storage battery unit, a DC/AC converter, a DC/DC converter, a direct current bus and a second control unit;
the grid-connected converter adopts a bidirectional DC/AC converter circuit topology, the alternating current side of the grid-connected converter is connected in parallel to the power supply line through a reactor, the direct current side of the grid-connected converter is connected to the direct current bus, and the grid-connected converter is used for realizing bidirectional flow of energy between the energy storage and conversion module and the power supply line;
the direct current output end of the storage battery unit is connected to the direct current bus, and when the power grid is in a low-ebb period, the power grid absorbs and stores power grid electric energy, and when the power grid is in a high-peak period or needs voltage compensation, the stored electric energy is released;
the direct current side of the DC/AC converter is connected to the direct current bus, and the alternating current side of the DC/AC converter is connected with the wind power access terminal and used for accessing alternating current electric energy generated by the wind generating set;
one pair of direct current terminals of the DC/DC converter is connected to the direct current bus, and the other pair of direct current terminals of the DC/DC converter is connected with a photovoltaic access terminal and is used for accessing direct current electric energy generated by photovoltaic power generation equipment;
the direct current bus is connected with the direct current output port of the energy storage and conversion module, is used for realizing the energy flow in the energy storage and conversion module, and outputs direct current electric energy to be supplied to the compensation inverter module through the direct current output port of the energy storage and conversion module;
the second control unit is respectively connected with the grid-connected converter, the storage battery unit, the DC/AC converter, the DC/DC converter, the direct current bus and the integrated control communication module, and is used for determining the working state of the energy storage and conversion module according to the voltage and current information of a power supply line, the running state information of the compensation inverter module, the state information of the storage battery unit and the voltage information of the direct current bus, which are output by the integrated control communication module, generating a second on-off control signal and outputting the second on-off control signal to the grid-connected converter, the storage battery unit, the DC/AC converter and the DC/DC converter for on-off control.
Optionally, the battery unit adopts a battery pack with a direct current output end containing a bidirectional direct current converter and a management subunit thereof; or the storage battery unit adopts a battery pack without a bidirectional direct current converter and a management subunit thereof.
Optionally, when the power grid is in a load valley period, the energy storage and conversion module works in a charging state, and receives and stores the electric energy of the power grid as a load; when the power grid is in a load peak period, the energy storage and conversion module works in an external discharging state and is used as a current source to feed power to the power grid so as to provide electric energy required by the power grid in the peak period; when the line voltage needs to be compensated, the energy storage and conversion module works in an internal discharge state and provides an energy source for the compensation inverter module through the direct current output port.
Optionally, the working state of the energy storage and conversion module includes: a charging state, an external discharging state, and an internal discharging state;
the charging state is as follows: the grid-connected converter works in a rectification state and is used for receiving the current of a power grid, and the energy flowing direction on the direct current bus flows into the storage battery unit from the direct current bus;
external discharge state: the storage battery unit works in a discharging state to release electric energy, the grid-connected converter works in an inverting state to inject current into a power grid, and at the moment, the energy on the direct current bus flows out of the storage battery unit to the direct current bus in the flowing direction and is finally injected into the power grid;
internal discharge state: the storage battery unit works in a discharging state and releases electric energy, at the moment, the energy flowing direction on the direct current bus is that the energy flows out of the storage battery unit to the direct current bus, and an energy source is provided for the compensation inverter module through a direct current output port.
Optionally, when the working state of the energy storage and conversion module is an internal discharge state, and when the sum of the remaining electric energy of the storage battery unit and the electric energy accessed by the new energy is enough to provide the energy required by the compensation inverter module, the grid-connected converter does not work in a rectification state, and the energy required by the compensation is provided by the storage battery unit and the new energy port;
when the sum of the residual electric energy of the storage battery unit and the electric energy accessed by the new energy is not enough to provide the energy required by the compensation inverter module, the grid-connected converter works in a rectification state to provide the energy required by compensation together.
Optionally, the integrated control communication module includes: the voltage and current information detection and processing unit and the data communication bus unit;
the voltage and current information detection and processing unit is connected with the power supply line and used for detecting and processing the acquired voltage and current information of the power supply line and outputting the voltage and current information to the compensation inverter module and the energy storage and conversion module through the data communication bus unit;
the data communication bus unit is connected with the compensation inverter module and the energy storage and conversion module and is used for finishing communication between the compensation inverter module and the energy storage and conversion module and realizing interaction of running state data information.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
(1) according to the invention, the compensation transformer technology is combined with the energy storage technology and the power electronic technology, and under the condition of not building a transformer substation, the system is distributed on the line, so that the voltage can be lifted in sections, the power utilization quality of a terminal user is ensured, the transmission loss of the line is greatly reduced, and the power supply problems of large voltage drop, large line loss and the like in a load dispersion area are effectively solved;
(2) the invention generates voltage with controllable amplitude and phase through the compensation inverter module, and injects the voltage into the power transmission line to realize full-phase voltage compensation. The SVG power supply device is combined with an SVG device with reactive, harmonic and three-phase unbalance compensation functions, so that the voltage and power quality comprehensive compensation of a distribution line can be realized, and the power supply radius can be effectively extended;
(3) the invention designs the energy storage and conversion module to be connected in parallel to the power supply circuit aiming at the problem of limiting the energy source of the direct current side of the controllable series compensation device in large-scale application, not only can realize the adjustment of the peak-valley load balance of the power grid, but also can be used as an energy extraction circuit of the compensation inverter module to provide stable large-capacity energy source support for the voltage compensation process. The energy storage and conversion module stores redundant electric energy emitted by the power supply end in the load valley period, and the stored electric energy can be used as an energy source of the compensation inverter module to support a voltage compensation process, so that the waste of a large amount of electric energy resources caused by the load peak valley problem is avoided. In addition, in order to ensure that the energy source is sufficient and has stability, the energy storage and conversion module designs a port for accessing new energy to absorb the electric energy generated by the new energy power generation system, and effectively avoids the problems of fluctuation, intermittence and the like caused by directly using the new energy power generation system as a power supply.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a block diagram of a line voltage compensation system based on an energy storage module and an inverter for supplying power according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a buck inverter module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of two topologies of a voltage generator according to an embodiment of the invention;
FIG. 4 is a schematic structural diagram of an energy storage and conversion module according to an embodiment of the invention;
FIG. 5 is a schematic diagram of two topologies of battery cells according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of an integrated control communication module according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a specific connection of a line voltage compensation system based on power supply of an energy storage module and an inverter according to an embodiment of the present invention;
fig. 8 is another specific connection diagram of the line voltage compensation system based on the energy storage module and the inverter power supply according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a line voltage compensation system based on energy storage module and inverter power supply comprises: the device comprises a compensating inverter module 2, a compensating transformer 1, an energy storage and conversion module 3 and an integrated control communication module 4.
The compensating inverter module 2 generates compensating voltage with controllable amplitude and phase through closed-loop control and outputs the compensating voltage to the primary side winding of the compensating transformer 1.
As shown in fig. 2, the buck inverter module includes: a voltage generator 21 and a first control unit 22.
The first control unit 22 is connected to the voltage generator 21 and the integrated control communication module 4, and configured to determine a working state of the compensation inverter module 2 according to the voltage and current information of the power supply line output by the integrated control communication module 4 and the running state information of the energy storage and conversion module 3, generate an on-off control signal (i.e., a first on-off control signal) of a corresponding switching device, and output the on-off control signal to the voltage generator 21 for on-off control.
The alternating current side output end of the voltage generator 21 is connected with the primary side winding of the compensation transformer 1, the direct current side input end of the voltage generator 21 is connected with the direct current output end of the energy storage and conversion module 3, and the voltage generator 21 is used for completing the conversion of direct current-alternating current energy according to the first on-off control signal, generating voltage required by compensation and outputting the voltage to the primary side winding of the compensation transformer 1.
As shown in fig. 3, the voltage generator adopts a three-phase inverter circuit or a three-phase inverter circuit with a DC input terminal including a DC/DC conversion circuit.
The secondary side winding of the compensation transformer 1 is connected in series in a power supply line, the primary side winding of the compensation transformer 1 is connected with the output end of the alternating current side of the compensation inverter module 2, and the compensation transformer 1 is used for coupling the compensation voltage into the power supply line to realize voltage compensation.
The energy storage and conversion module 3 is connected in parallel in a power supply line, and a direct current output port of the energy storage and conversion module 3 is connected with a direct current side input end of the compensation inverter module 2 and is used for providing an energy source for the compensation inverter module 2 and realizing peak-valley balance adjustment of a power grid. When the power grid is in a load valley period, the energy storage and conversion module 3 works in a charging state, can receive and store the electric energy of the power grid as a load, and when the power grid is in a load peak period, the energy storage and conversion module 3 works in an external discharging state, can feed electricity to the power grid as a current source, and provides the electric energy required by the power grid peak period; when the line voltage needs to be compensated, the energy storage and conversion module 3 works in an internal discharge state, and provides an energy source for the compensation inverter module 2 through the direct current output port.
As shown in fig. 4, the energy storage and conversion module 3 includes: grid-connected converter 31, battery unit 32, DC/AC converter 33, DC/DC converter 34, DC bus 35, and second control unit 36. The grid-connected converter 31 adopts a bidirectional DC/AC converter circuit topology, an alternating current side is connected in parallel to a power transmission line through a reactor, a direct current side is connected to a direct current bus 35, and the grid-connected converter 31 is used for realizing bidirectional flow of energy between the energy storage and conversion module 3 and a power supply line. The dc output of the battery unit 32 is connected to a dc bus 35 for absorbing and storing the grid power during the off-peak period of the grid and for releasing the stored power during the peak period or when voltage compensation is required. The DC side of the DC/AC converter 33 is connected to a DC bus 35, and the AC side is connected with a wind power access terminal for accessing the AC power generated by the wind generating set. One pair of DC terminals of the DC/DC converter 34 is connected to the DC bus 35, and the other pair of DC terminals is connected to the photovoltaic access terminal for accessing DC power generated by the photovoltaic power generation device. The dc bus 35 is connected to the dc output port of the energy storage and conversion module 3, and is configured to enable energy inside the energy storage and conversion module 3 to flow and output dc power through the dc output port to the compensation inverter module 2. The second control unit 36 is connected to the other units (31-35) and the integrated control communication module 4, and configured to compensate operating state information of the inverter module 2, state information (SOC state of charge, etc.) of the battery unit 32, and voltage information of the dc bus 35 according to voltage and current information of a power supply line output by the integrated control communication module 4, determine a working state of the energy storage and conversion module 3, generate an on-off control signal (i.e., a second on-off control signal) of a corresponding switching device, and output the on-off control signal to each power converter for on-off control.
As shown in fig. 5, the battery unit 32 adopts a battery pack with a bidirectional dc converter at a dc output terminal and a management subunit thereof or a battery pack without a bidirectional dc converter and a management subunit thereof, that is, the dc output terminals of the battery pack and the management subunit are directly connected to the dc bus 35.
In this example, the working states of the energy storage and conversion module 3 include: at least one of a charged state, an externally discharged state, and an internally discharged state:
a. the charging state is as follows: the storage battery unit 32 works in a charging state and stores electric energy; the grid-connected converter 31 works in a rectification state and receives the grid current, and the energy on the direct current bus 35 flows into the storage battery unit 32 from the direct current bus at the moment;
b. external discharge state: the storage battery unit 32 works in a discharging state to release electric energy, the grid-connected converter 31 works in an inverting state to inject current into the power grid, and at the moment, the energy on the direct current bus 35 flows out of the storage battery unit 32 to the direct current bus 35 in the flowing direction and is finally injected into the power grid;
c. internal discharge state: the accumulator unit 32 works in a discharge state, releasing electric energy; at this time, the energy flowing direction on the dc bus 35 is from the battery unit 32 to the dc bus 35, and the energy source is provided for the compensating inverter module 2 through the dc output port. Whether the grid-connected converter 31 works in the rectification state or not is determined by the second control unit 36, and the principle is as follows:
when the sum of the residual electric energy of the storage battery unit 32 and the electric energy accessed by the new energy is enough to provide the energy required by the compensation inverter module 2, the grid-connected converter 31 does not work in a rectification state, and the energy required by the compensation is provided by the storage battery unit 32 and the new energy port;
when the sum of the residual electric energy of the storage battery unit 32 and the electric energy accessed by the new energy is not enough to provide the energy required by the compensation inverter module 2, the grid-connected converter 31 works in a rectification state to provide the energy required by the compensation together.
The integrated control communication module 4 is connected with the power supply line, the compensating inverter module 2 and the energy storage and conversion module 3, and is used for detecting and processing voltage and current information of the power supply line, outputting the voltage and current information to the compensating inverter module 2 and the energy storage and conversion module 3, and simultaneously realizing communication between the compensating inverter module 2 and the energy storage and conversion module 3.
As shown in fig. 6, the integrated control communication module 4 includes: a voltage current information detection and processing unit 41 and a data communication bus unit 42. The voltage and current information detecting and processing unit 41 is connected to the power supply line, and is configured to detect and process the acquired voltage and current information of the power supply line, and output the voltage and current information to the buck inverter module 2 and the energy storage and conversion module 3 through the data communication bus unit. The data communication bus unit 42 is connected to the compensation inverter module 2 and the energy storage and conversion module 3, and is configured to complete communication between the two modules (the compensation inverter module and the energy storage and conversion module), so as to implement interaction of data information of an operating state. In this embodiment, the voltage and current information detecting and processing unit may adopt a Shenzhen Jiansi research JSY-MK-141 series sampling module, or may adopt other sampling modules in the prior art, so that the phase voltage and current data acquisition and output can be realized. The data communication bus unit can be realized by RS-485.
The line voltage compensation system based on energy storage module and inverter power supply in this embodiment uses with the SVG device that has idle work, harmonic, unbalanced three phase compensation function jointly, has realized the voltage and the electric energy quality of distribution lines and has synthesized the compensation, effectively realizes the power supply radius and extends.
Fig. 7 is a schematic diagram of a specific connection of a line voltage compensation system based on power supply of an energy storage module and an inverter according to an embodiment of the present invention; as shown in fig. 7, the voltage generator directly adopts a three-phase inverter circuit, that is, a schematic structural diagram of the voltage generator without a DC/DC conversion circuit as shown in the right diagram of fig. 3 is adopted, and at this time, the DC voltage value input to the three-phase inverter circuit is the voltage value of the DC bus in the energy storage and conversion module.
The battery unit adopts a battery pack with a direct current output end containing a bidirectional direct current converter and a management subunit thereof, and has a battery unit structure shown in the left diagram of fig. 5. At this time, the voltage V of the DC busDCIs constant and does not change with the change of the state of charge of the battery pack, and the direct current output end of the battery pack and the management subunit thereofThe voltage amplitude is converted into the voltage V of the direct current bus through the bidirectional BUCK-BOOST converterDCAnd then output the voltage value. Because the DC bus voltage V is nowDCIs a constant value, and therefore the magnitude of the constant voltage is used as a voltage reference when controlling each converter.
Fig. 8 is another specific connection diagram of the line voltage compensation system based on the energy storage module and the inverter power supply according to the embodiment of the present invention. As shown in fig. 8, the voltage generator adopts a three-phase inverter circuit with a DC/DC conversion circuit at a DC input end, that is, a voltage generator structure schematic diagram with a DC/DC conversion circuit as shown in the left diagram of fig. 3 is adopted, at this time, the DC voltage input to the three-phase inverter circuit is no longer equal to the voltage value V of the DC bus in the energy storage and conversion systemDCAre equal but VDCVoltage after DC-DC conversion.
The battery unit adopts a battery pack and a management subunit thereof, wherein the direct current output end of the battery pack does not contain a bidirectional direct current converter, namely, the direct current output ends of the battery pack and the management subunit thereof are directly connected to a direct current bus, and the structure of the battery unit is shown in the right diagram of fig. 5. At this time, the voltage V of the DC busDCThe voltage of the battery pack and the voltage of the direct current output end of the management subunit at the moment are used as voltage reference values when each converter is controlled.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A line voltage compensation system based on energy storage module and inverter power supply, characterized by includes: the system comprises a compensation inverter module, a compensation transformer, an energy storage and conversion module and an integrated control communication module;
the compensation inverter module generates compensation voltage with controllable amplitude and phase through closed-loop control and outputs the compensation voltage to a primary side winding of the compensation transformer;
the secondary side winding of the compensation transformer is connected in series in a power supply line, the primary side winding of the compensation transformer is connected with the output end of the compensation inverter module on the alternating current side, and the compensation transformer is used for coupling the compensation voltage into the power supply line to realize voltage compensation;
the energy storage and conversion module is connected in parallel in a power supply line, and a direct current output port of the energy storage and conversion module is connected with a direct current side input end of the compensation inverter module and used for providing an energy source for the compensation inverter module and realizing peak-valley balance adjustment of a power grid;
the integrated control communication module is connected with the power supply line, the compensating inverter module and the energy storage and conversion module, and is used for detecting and processing voltage and current information of the power supply line, outputting the voltage and current information to the compensating inverter module and the energy storage and conversion module, and simultaneously realizing communication between the compensating inverter module and the energy storage and conversion module.
2. The energy storage module and inverter supply based line voltage compensation system of claim 1, wherein the compensating inverter module comprises: a voltage generator and a first control unit;
the first control unit is respectively connected with the voltage generator and the integrated control communication module, and is used for determining the working state of the compensation inverter module according to the voltage and current information of the power supply line output by the integrated control communication module and the running state information of the energy storage and conversion module, generating a first on-off control signal and outputting the first on-off control signal to the voltage generator.
And the alternating current side output end of the voltage generator is connected with the primary side winding of the compensation transformer, and the direct current side input end of the voltage generator is connected with the direct current output port of the energy storage and conversion module and is used for finishing the conversion of direct current-alternating current energy according to the first on-off control signal and generating voltage required by compensation and outputting the voltage to the primary side winding of the compensation transformer.
3. The energy storage module and inverter-based line voltage compensation system of claim 2, wherein the voltage generator employs a three-phase inverter circuit.
4. The energy storage module and inverter based line voltage compensation system of claim 2, wherein the voltage generator employs a three-phase inverter circuit having a DC input with a DC/DC conversion circuit.
5. The energy storage module and inverter supply based line voltage compensation system of claim 1, wherein the energy storage and conversion module comprises: the system comprises a grid-connected converter, a storage battery unit, a DC/AC converter, a DC/DC converter, a direct current bus and a second control unit;
the grid-connected converter adopts a bidirectional DC/AC converter circuit topology, the alternating current side of the grid-connected converter is connected in parallel to the power supply line through a reactor, the direct current side of the grid-connected converter is connected to the direct current bus, and the grid-connected converter is used for realizing bidirectional flow of energy between the energy storage and conversion module and the power supply line;
the direct current output end of the storage battery unit is connected to the direct current bus, and when the power grid is in a low-ebb period, the power grid absorbs and stores power grid electric energy, and when the power grid is in a high-peak period or needs voltage compensation, the stored electric energy is released;
the direct current side of the DC/AC converter is connected to the direct current bus, and the alternating current side of the DC/AC converter is connected with the wind power access terminal and used for accessing alternating current electric energy generated by the wind generating set;
one pair of direct current terminals of the DC/DC converter is connected to the direct current bus, and the other pair of direct current terminals of the DC/DC converter is connected with a photovoltaic access terminal and is used for accessing direct current electric energy generated by photovoltaic power generation equipment;
the direct current bus is connected with the direct current output port of the energy storage and conversion module, is used for realizing the energy flow in the energy storage and conversion module, and outputs direct current electric energy to be supplied to the compensation inverter module through the direct current output port of the energy storage and conversion module;
the second control unit is respectively connected with the grid-connected converter, the storage battery unit, the DC/AC converter, the DC/DC converter, the direct current bus and the integrated control communication module, and is used for determining the working state of the energy storage and conversion module according to the voltage and current information of a power supply line, the running state information of the compensation inverter module, the state information of the storage battery unit and the voltage information of the direct current bus, which are output by the integrated control communication module, generating a second on-off control signal and outputting the second on-off control signal to the grid-connected converter, the storage battery unit, the DC/AC converter and the DC/DC converter for on-off control.
6. The energy storage module and inverter power based line voltage compensation system of claim 5, wherein the battery unit adopts a battery pack with a bidirectional DC converter at a DC output end and a management subunit thereof; or the storage battery unit adopts a battery pack without a bidirectional direct current converter and a management subunit thereof.
7. The energy storage module and inverter power supply-based line voltage compensation system of claim 1, wherein when the power grid is in a load valley period, the energy storage and conversion module works in a charging state, and receives and stores the power of the power grid as a load; when the power grid is in a load peak period, the energy storage and conversion module works in an external discharging state and is used as a current source to feed power to the power grid so as to provide electric energy required by the power grid in the peak period; when the line voltage needs to be compensated, the energy storage and conversion module works in an internal discharge state and provides an energy source for the compensation inverter module through the direct current output port.
8. The energy storage module and inverter supply based line voltage compensation system of claim 7, wherein the operating state of the energy storage and conversion module comprises: a charging state, an external discharging state, and an internal discharging state;
the charging state is as follows: the grid-connected converter works in a rectification state and is used for receiving the current of a power grid, and the energy flowing direction on the direct current bus flows into the storage battery unit from the direct current bus;
external discharge state: the storage battery unit works in a discharging state to release electric energy, the grid-connected converter works in an inverting state to inject current into a power grid, and at the moment, the energy on the direct current bus flows out of the storage battery unit to the direct current bus in the flowing direction and is finally injected into the power grid;
internal discharge state: the storage battery unit works in a discharging state and releases electric energy, at the moment, the energy flowing direction on the direct current bus is that the energy flows out of the storage battery unit to the direct current bus, and an energy source is provided for the compensation inverter module through a direct current output port.
9. The energy storage module and inverter power supply-based line voltage compensation system of claim 8, wherein when the working state of the energy storage and conversion module is an internal discharge state, when the sum of the residual electric energy of the storage battery unit and the electric energy accessed by the new energy is enough to provide the energy required by the inverter compensation module, the grid-connected converter does not work in a rectification state, and the energy required by the compensation is provided by the storage battery unit and the new energy port;
when the sum of the residual electric energy of the storage battery unit and the electric energy accessed by the new energy is not enough to provide the energy required by the compensation inverter module, the grid-connected converter works in a rectification state to provide the energy required by compensation together.
10. The energy storage module and inverter supply based line voltage compensation system of claim 1, wherein the integrated control communication module comprises: the voltage and current information detection and processing unit and the data communication bus unit;
the voltage and current information detection and processing unit is connected with the power supply line and used for detecting and processing the acquired voltage and current information of the power supply line and outputting the voltage and current information to the compensation inverter module and the energy storage and conversion module through the data communication bus unit;
the data communication bus unit is connected with the compensation inverter module and the energy storage and conversion module and is used for finishing communication between the compensation inverter module and the energy storage and conversion module and realizing interaction of running state data information.
CN202010596625.4A 2020-06-28 2020-06-28 Line voltage compensation system based on energy storage module and inverter power supply Pending CN111668849A (en)

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CN113067359A (en) * 2021-03-30 2021-07-02 贵州电网有限责任公司 Direct-current distribution voltage stabilizing system with intelligent bypass function and control method
RU2767517C1 (en) * 2021-08-20 2022-03-17 Федеральное государственное бюджетное научное учреждение «Федеральный научный агроинженерный центр ВИМ» (ФГБНУ ФНАЦ ВИМ) Method and device for automatic voltage control in an electric network using an electric energy accumulator
CN114243719A (en) * 2021-12-24 2022-03-25 四川航电微能源有限公司 Automatic voltage regulating device and system for long-distance power supply

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CN112994133A (en) * 2019-12-17 2021-06-18 西安西电高压开关有限责任公司 Energy storage battery interface device
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