CN117318126A - Micro-grid power quality optimization and energy storage integrated device and control method - Google Patents
Micro-grid power quality optimization and energy storage integrated device and control method Download PDFInfo
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- CN117318126A CN117318126A CN202311618957.8A CN202311618957A CN117318126A CN 117318126 A CN117318126 A CN 117318126A CN 202311618957 A CN202311618957 A CN 202311618957A CN 117318126 A CN117318126 A CN 117318126A
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Classifications
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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
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- 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
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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
- 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
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to the technical field of micro-grids, and provides a micro-grid power quality optimization and energy storage integrated device and a control method thereof, wherein a first converter is connected with a direct current side of a second converter, so as to solve various new problems of a power distribution system after new energy is accessed in a conventional device; the direct current side of the second converter is connected with the energy storage battery, and the alternating current side of the second converter is connected with the micro-grid system; the alternating current side of the first converter is connected with the secondary side of the transformer; when the voltage of the power grid side fluctuates, compensating the voltage fluctuation through the first converter, and actively regulating the terminal voltage; the second converter is used for charge and discharge management of the energy storage battery and quality management of electric energy, and solves the quality problems of three-phase imbalance, harmonic waves, reactive power and the like existing after new energy is accessed. Through the constructed framework, the first converter and the second converter can work simultaneously, and comprehensive treatment is realized.
Description
Technical Field
The invention belongs to the technical field related to micro-grids, and particularly relates to a micro-grid power quality optimization and energy storage integrated device and a control method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the increasing ratio of new energy in the power system, a large amount of new energy such as photovoltaic, wind power and the like is connected into the power distribution system, and the problems of great fluctuation of new energy output, great difficulty in power balance and operation control, difficult absorption when the new energy generating capacity is large, occupation of the conventional power supply space, and outstanding absorption and safety contradiction exist. Meanwhile, the electric energy quality can be generated and deteriorated, and various problems such as rising of line terminal voltage, unbalanced three phases caused by single-phase power generation equipment, system resonance caused by a passive network in a grid-connected inverter, power factor reduction caused by reduction of network side load demand after new energy is accessed are caused. In view of the above practical problems, conventional power quality management apparatuses are difficult to deal with.
The energy storage technology is mainly used for solving the problems of large-scale access of renewable energy sources such as wind energy, solar energy and the like, multi-energy complementary coupling utilization and improvement of renewable energy sources such as wind power, photovoltaic and the like.
An active filter is adopted to mainly solve the problem of harmonic pollution, and reactive compensation equipment can only improve the power factor; the conventional device at present cannot comprehensively solve various new problems, such as terminal voltage lifting, fluctuation and flickering, faced by a power distribution system after new energy is accessed; the problem of three-phase unbalance caused by single-phase power generation and electric equipment; system resonance caused by a passive network in the grid-connected inverter; the power factor is reduced due to the fact that the active demand on the network side is reduced after the new energy is accessed; harmonic pollution of power generation electric equipment and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a micro-grid power quality optimization and energy storage integrated device and a control method.
To achieve the above object, a first aspect of the present invention provides a micro-grid power quality optimization and energy storage integrated device, including: the device comprises a controller, a transformer, a first converter and a second converter;
the primary side of the transformer is connected in series in the micro-grid system, and the secondary side of the transformer is connected with the alternating current side of the first converter; the direct current side of the first converter is connected with the direct current side of the second converter;
the direct current side of the second converter is connected with the energy storage battery, and the alternating current side of the second converter is connected with the micro-grid system;
the controller is connected with the first converter, and when the voltage fluctuates, the controller generates a voltage difference by controlling the first converter to carry out pulse width modulation, and the generated voltage difference is superimposed into a micro-grid system through the secondary side of the transformer for line voltage compensation;
the controller is also connected with the second converter and used for controlling the second converter to charge and discharge the energy storage battery and controlling the second converter to be used for electric energy quality management according to the load real-time voltage and current.
The second aspect of the present invention provides a method for controlling integration of power quality optimization and energy storage of a micro-grid, which is applied to the above-mentioned integrated device for power quality optimization and energy storage of a micro-grid, and comprises:
according to the voltage of the power grid side, the first converter outputs a corresponding voltage difference to carry out voltage fluctuation compensation;
and controlling the second converter to carry out electric energy quality management according to the load real-time voltage and current, and controlling the second converter to charge and discharge the energy storage battery according to the charge and discharge logic.
The one or more of the above technical solutions have the following beneficial effects:
in the invention, the first converter is connected with the direct current side of the second converter; the direct current side of the second converter is connected with the energy storage battery, and the alternating current side of the second converter is connected with the micro-grid system; the alternating current side of the first converter is connected with the secondary side of the transformer. When the voltage on the power grid side fluctuates, the first converter compensates the voltage fluctuation, actively adjusts the terminal voltage, and solves the problems of terminal voltage lifting and the like; the second converter is used for charge and discharge management of the energy storage battery and quality management of electric energy, and solves the quality problems of three-phase imbalance, harmonic waves, reactive power and the like existing after new energy is accessed. Through the constructed framework, the first converter and the second converter can work simultaneously, and comprehensive treatment is realized.
The invention can be applied to a high-proportion new energy distribution system, combines the electric energy quality control and the energy storage into a whole, improves the utilization rate of a grid-connected device, reduces the loss, reduces the installation space, saves the investment of users, and solves the electric energy quality problem caused by large-scale access of distributed multi-source renewable energy sources.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram illustrating internal connection of a micro-grid power quality optimization and energy storage integrated device according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating a controller according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of control logic of a space-time segmentation method according to a first embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1, this embodiment discloses a micro-grid power quality optimization and energy storage integrated device, which includes: the device comprises a controller, a transformer, a first converter and a second converter;
the primary side of the transformer is connected in series in the micro-grid system, and the secondary side of the transformer is connected with the alternating current side of the first converter; the direct current side of the first converter is connected with the direct current side of the second converter;
the direct current side of the second converter is connected with the energy storage battery, and the alternating current side of the second converter is connected with the micro-grid system;
the controller is connected with the first converter, and when the voltage fluctuates, the controller generates a voltage difference by controlling the first converter to carry out pulse width modulation, and the generated voltage difference is superimposed into the micro-grid system through the secondary side of the transformer for line voltage compensation;
the controller is also connected with the second converter and used for controlling the second converter to charge and discharge the energy storage battery and controlling the second converter to be used for electric energy quality management according to the load real-time voltage and current.
In this embodiment, the first current transformer and the second current transformer are configured back to back, and the dc side of the second current transformer is connected to the energy storage battery. The first converter connected with the transformer side is used for compensating voltage fluctuation of a power grid, realizing the function of dynamic voltage regulation, solving the voltage fluctuation and realizing the voltage stability of system electric equipment.
The second converter connected with the system side is used for comprehensively treating the power quality of the system, treating the power quality problems in the system such as harmonic wave, reactive power, unbalance and the like, and simultaneously performing peak clipping, valley filling, frequency modulation, peak regulation and the like according to an electricity price excitation compensation mechanism so as to realize the functions of capacity increase and the like of the transformer.
In this embodiment, the first converter is connected to the dc side of the second converter, the energy flow is controlled by the controller, and the bus voltage between the two converters is determined by the energy storage battery. During voltage compensation, the energy storage battery is provided, a voltage difference is inverted through the first converter, and the voltage difference is overlapped to the primary side through the transformer to be compensated. The electric energy quality management and the battery charging and discharging are realized by a second converter; the first current transformer is voltage compensation, and the second current transformer is current compensation.
Under the condition that the device is connected with the grid, the local controller receives power dispatching preferentially through the remote monitoring system, and the local controller controls the second converter to rapidly output the required active power to finish the peak regulation and frequency modulation requirements of the power grid.
In this embodiment, the primary side of the transformer T is connected in series in the system, and the secondary side is connected to the ac side of the first converter, so as to realize electrical isolation, where the transformer T is a high leakage inductance transformer, and the primary side voltage will not be suddenly changed when the secondary side of the transformer T is shorted. The local controller MC is used for detecting the power grid side voltage GPT and the load side voltage MPT, actively regulating the tail end voltage, when the power grid voltage GPT fluctuates, pulse width modulation is carried out through the first converter, required voltage difference is provided, the secondary side of the transformer T is overlapped to the primary side, the tail end voltage is actively regulated, line voltage compensation is achieved, and a stable voltage source is provided for a load.
Specifically, the voltage on the power grid side is detected, sampling is carried out according to 256-point frequency of one cycle, three-phase instantaneous value calculation is carried out by 78us, fundamental wave extraction is carried out on the voltage, when the power grid voltage fluctuates, the difference between a standard value U1 and an actual value U2 is calculated, a control system provides a required differential pressure delta U by carrying out pulse width modulation on power electronic devices in a first converter, U1=U2±delta U is provided, the secondary side of a transformer is overlapped to the primary side, terminal voltage is actively regulated, line voltage compensation is realized, and a stable voltage source is provided for a load.
In the embodiment, the local controller detects the sum of power generation and power consumption in real time through voltage and current at the power grid side, automatically tracks the load change of the area, and controls the second converter to adjust the energy storage or power generation power according to preset parameters, so that the preferential spontaneous self-use is ensured, and the area power consumption efficiency is improved; the device stores energy and generates electricity according to a preset schedule and a plan, so that peak clipping and valley filling functions are realized, and the electric charge of a platform area is reduced; the device provides quick reactive power support and active smoothing, stabilizes the voltage and frequency of the power grid, reduces the voltage fluctuation and flicker of the power grid, reduces the power rejection, and improves the grid-connected power generation efficiency.
For the second converter: the first priority is to accept power grid dispatching, realize peak shaving and frequency modulation functions, and output power according to the required power; the second priority is to combine the price excitation policy to manage charge and discharge, and control the capacity according to the control logic of space-time segmentation method; on the basis of meeting the first priority and the second priority, the residual capacity is used for controlling the power quality of harmonic waves, reactive power, three-phase imbalance and the like, the priority of the power quality control can be set, and the working modes of harmonic wave priority, reactive power priority, imbalance priority, harmonic wave filtering only, reactive power compensation only, imbalance correction only and the like are selected. The voltage sag and sag treatment is achieved by the first converter.
The second converter can be used for comprehensively treating the electric energy quality problems such as harmonic wave, reactive power, voltage sag/sag rise, three-phase unbalance and the like by partial capacity under the condition of not influencing active interaction; under the condition of non-active interaction, the electric energy quality problem can be treated with full power, and the electric energy quality problem of the system is solved. The reactive power, the harmonic current and the three-phase unbalanced power in the electric energy quality in the system are respectively calculated by detecting the voltage and the current of the load and analyzing and calculating the voltage and the current of the load through a control system, and the reactive power and the harmonic current in the cancellation system are respectively calculated; the negative sequence current and the zero sequence current of the three-phase unbalance are extracted, the integrated device detects and analyzes the negative sequence current and the zero sequence current existing in the system in real time, the second converter is controlled to finish the energy storage function, the residual capacity of the second converter can be used for compensating the unbalance of the system, the utilization rate of the device can be fully improved, and when the charging and discharging are not needed, the full capacity can be used for three-phase unbalance correction.
Specifically, the voltage and the current at the load side are detected in real time, the instantaneous reactive power theory is used for analyzing, the current harmonic wave, the three-phase unbalanced power and the reactive power in the load in one cycle are extracted, and meanwhile, the electric energy quality management is carried out according to the residual capacity on the premise of preferentially meeting the charge-discharge capacity of the energy storage.
The reactive power is obtained by sampling three-phase voltage and current, calculating apparent power S=UI according to voltage U, current I and phase angle phi, active power P=UI cos phi, reactive power Q=UI sin phi, and compensating reverse reactive power-Q to offset the reactive power.
The instruction current operation circuit of the main control system monitors load current in real time, converts an analog current signal into a digital signal, sends the digital signal into a high-speed digital signal processor DSP to process the signal, extracts fundamental reactive current and harmonic current to obtain instruction current, sends driving pulse to the compensation current generation circuit in a Pulse Width Modulation (PWM) signal mode through the current tracking control circuit and the driving circuit, and drives the IGBT power module in the second converter to generate reverse equivalent compensation current to be injected into a power grid, so that the dynamic, rapid and thorough treatment of the load reactive current and the harmonic current is realized. Active power in a three-phase circuit is adjusted in an interphase mode through a direct current energy storage system shared by three phases in the equipment, so that unbalanced load of the three phases is balanced and corrected.
In this embodiment, as shown in fig. 2, the local controller is composed of a main control board, a communication expansion board, an interface expansion module, and a display screen. The master-slave control board is responsible for the logic control of the complete machine system, the generation of slave instructions and the calculation of electric quantity, and issues the instructions to each unit through the high-speed optical fiber interface; the multi-DSP cooperative control is adopted, so that the control precision is high, the dynamic response speed is high, and various control functions of energy storage and electric energy quality control are met; the optical fiber isolation driving is adopted between the unit and the unit, so that the anti-interference capability is strong; the communication expansion board starts up and down, and copies and transmits the communication and instruction signals issued by the main controller to each unit, so that the system expansion is facilitated; the data returned from the controller and the interface expansion module are summarized and then returned to the main controller; the interface expansion module is responsible for opening in and opening out interface expansion; the display screen is responsible for communicating with the main controller, collecting and displaying all information such as electric quantity, equipment working information state, parameter setting and modifying, history record and the like, and simultaneously receiving remote operation and maintenance and power dispatching.
The embodiment further includes: the remote operation and maintenance monitoring system is wirelessly interconnected with the local device based on the 5G platform, realizes remote data monitoring and instruction regulation and control, adopts GOOSE protocol communication for equipment capable of participating in rapid power control, realizes ms-level cooperative control, abstracts all local equipment into sending, storing and loading, establishes a mathematical model, carries out power flow simulation analysis, optimizes algorithm logic, realizes power balance and energy balance in a group, reduces mutual economic loss and improves the overall economic benefit of the system.
The embodiment also comprises a rapid switching device STS for realizing rapid on-off of the power grid, and has a isolated network operation function. Under the normal condition of the power grid, the STS is conducted, and the device works in a grid-connected state. When the power grid has a power failure, the main control rapidly detects the power grid power failure, the rapid switching device STS is rapidly disconnected, the transformer area is converted into a micro-grid power supply mode, the second converter rapidly converts into a voltage source through the energy storage battery, voltage support is provided for new energy power generation equipment, normal power generation of the power generation equipment is ensured, uninterrupted power is provided for regional loads, and uninterrupted power supply of the region is ensured. When the rapid switching device STS fails, the main control system controls the contactor KM1 to cut off the active bypass of the STS, and the device is cut off and separated from a power grid through the bypass switch QF1 when being maintained and overhauled.
In this embodiment, as shown in fig. 3, a control logic of a space-time segmentation method is also designed to implement control over charging and discharging logic of the energy storage battery in the system. The determination is made based on the generated power function f1, the time function f2, and the load power function f 3.
Specifically, if the generated power is greater than the upper threshold, then: f1 =1;
if the power generation upper limit threshold is more than or equal to the power generation power is more than or equal to the power generation lower limit threshold, the method comprises the following steps: f1 =0;
if the generated power is less than the lower generation threshold value, the following steps are performed: f1 -1;
if the time is between 9:00 and 17:00, then: f2 =1;
if the time is 8:00-9:00, 17:00-18:00, 20:00-5:00, then: f2 =0;
if the time is 5:00-8:00, 18:00-20:00, then: f2 -1;
if the load power > the heavy load threshold, then: f3 -1;
if the heavy load threshold is greater than or equal to the load power is greater than or equal to the light load threshold, then: f3 =0;
if the load power is less than the light load threshold, then: f3 =1.
And setting an automatic or manual operation mechanism through a human-computer interface, and carrying out charge and discharge management on the energy storage battery through a control converter.
By judging that the battery SOC is less than 100% and the time reaches 15: at 00, the battery is charged to 100% cutoff at (100% -the battery SOC) ×total capacity/2 current.
If not, judging whether f2=0, and if so, not charging and not discharging; if the charge and discharge determination is not performed by calculating f1+f2+f3, specifically:
if f1+f2+f3=3, the device charges the battery with the rated power of the second converter;
if f1+f2+f3=2, the device charges the battery with 50% of the rated power of the second converter;
if f1+f2+f3= -1/0/1, the battery is not charged and discharged;
if f1+f2+f3= -2/-3, the device discharges the battery with constant power at the rated power of the second converter;
until the charge is 100% or the discharge is 5%.
Example two
The purpose of this embodiment is to provide a microgrid power quality optimization and energy storage integrated control method, which can be applied to the microgrid power quality optimization and energy storage integrated control device provided in the first embodiment, and includes:
according to the voltage of the power grid side, the first converter outputs a corresponding voltage difference to carry out voltage fluctuation compensation;
and controlling the second converter to carry out electric energy quality management according to the load real-time voltage and current, and controlling the second converter to charge and discharge the energy storage battery according to the charge and discharge logic.
The first level of the priority of the second converter is the dispatching of the receiving power grid, peak shaving and frequency modulation are carried out according to the dispatching requirement of the power grid, and power output is carried out according to the required power; the second level of the priority of the second converter is charge and discharge management by a space-time segmentation method combined with an electricity price excitation strategy; and on the basis of meeting the first priority level and the second priority level, the second converter carries out power quality management on the residual capacity.
It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented by general-purpose computer means, alternatively they may be implemented by program code executable by computing means, whereby they may be stored in storage means for execution by computing means, or they may be made into individual integrated circuit modules separately, or a plurality of modules or steps in them may be made into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. The utility model provides a microgrid electric energy quality optimizes and energy storage integrated device which characterized in that includes: the device comprises a controller, a transformer, a first converter and a second converter;
the primary side of the transformer is connected in series in the micro-grid system, and the secondary side of the transformer is connected with the alternating current side of the first converter; the direct current side of the first converter is connected with the direct current side of the second converter;
the direct current side of the second converter is connected with the energy storage battery, and the alternating current side of the second converter is connected with the micro-grid system;
the controller is connected with the first converter, and when the voltage fluctuates, the controller generates a voltage difference by controlling the first converter to carry out pulse width modulation, and the generated voltage difference is superimposed into a micro-grid system through the secondary side of the transformer for line voltage compensation;
the controller is also connected with the second converter and used for controlling the second converter to charge and discharge the energy storage battery and controlling the second converter to be used for electric energy quality management according to the load real-time voltage and current.
2. The integrated device for optimizing power quality and storing energy in a micro-grid according to claim 1, further comprising a fast switching device, wherein the fast switching device performs fast switching between off-grid and on-grid.
3. The integrated device for optimizing the power quality and storing energy of a micro-grid according to claim 1, wherein the controller separates reactive current, harmonic current, unbalanced current and harmonic voltage of the load according to load voltage and current to obtain corresponding power quality optimization command current, and controls the second converter to generate compensation current for optimizing the power quality according to the power quality optimization command current, so as to filter harmonic wave, reactive support and three-phase imbalance management.
4. The integrated microgrid power quality optimization and energy storage device of claim 1, wherein said controller controls energy flow between said first and second power converters, and wherein a bus voltage between said first and second power converters is determined based on said energy storage cells.
5. The integrated device for optimizing the electric energy quality and storing energy of the micro-grid according to claim 1, wherein the first priority level of the second converter is the dispatching of the receiving power grid, peak shaving and frequency modulation are carried out according to the dispatching requirement of the power grid, and power output is carried out according to the required power; the second priority of the second converter is charge and discharge management by a space-time segmentation method combined with an electricity price excitation strategy; and on the basis of meeting the first priority level and the second priority level, the second converter carries out power quality management on the residual capacity.
6. The integrated device for optimizing the power quality and storing energy of a micro-grid according to claim 5, wherein the controller calculates reactive power, harmonic current and three-phase unbalanced power in the power quality in the system according to the voltage and current of the detected load, and cancels the reactive power and the harmonic current in the system; the controller calculates according to the real-time detected negative sequence and zero sequence current, controls the second converter to finish the energy storage function, and simultaneously uses the residual capacity of the second converter to compensate the unbalance of the system, and uses the full capacity of the second converter to correct the three-phase unbalance when the charging and discharging are not needed.
7. The integrated device for optimizing the power quality and storing energy of a micro-grid according to claim 2, wherein the second converter converts the energy storage battery into a voltage source to supply power to the new energy power generation equipment under the condition that the rapid switching device is switched off.
8. A micro-grid power quality optimization and energy storage integrated control method applied to the micro-grid power quality optimization and energy storage integrated device as set forth in any one of claims 1 to 7, comprising:
according to the voltage of the power grid side, the first converter outputs a corresponding voltage difference to carry out voltage fluctuation compensation;
and controlling the second converter to carry out electric energy quality management according to the load real-time voltage and current, and controlling the second converter to charge and discharge the energy storage battery according to the charge and discharge logic.
9. The integrated control method for optimizing the power quality and storing energy of the micro-grid according to claim 8, wherein the first priority of the second converter is scheduling of a receiving power grid, peak shaving and frequency modulation are performed according to the scheduling requirement of the power grid, and power output is performed according to the required power; the second priority of the second converter is charge and discharge management by a space-time segmentation method combined with an electricity price excitation strategy; and on the basis of meeting the first priority level and the second priority level, the second converter carries out power quality management on the residual capacity.
10. The integrated control method for optimizing the power quality and storing energy of a micro-grid according to claim 9, wherein the space-time segmentation method is as follows:
determining a power generation power function according to the actual power generation power and the upper limit and the lower limit of the power generation power;
determining time functions of different time periods by combining an electricity price excitation strategy;
determining a load power function according to the load power and the light-heavy load threshold;
and determining the charge and discharge of the second converter according to the generated power function, the time function and the load power function.
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