CN111668846A - Photovoltaic dual-mode self-adaptive cross-cell consumption method and system - Google Patents

Photovoltaic dual-mode self-adaptive cross-cell consumption method and system Download PDF

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CN111668846A
CN111668846A CN202010560800.4A CN202010560800A CN111668846A CN 111668846 A CN111668846 A CN 111668846A CN 202010560800 A CN202010560800 A CN 202010560800A CN 111668846 A CN111668846 A CN 111668846A
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power
area
mode
dual
photovoltaic
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CN111668846B (en
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吴俊勇
赵鹏杰
艾洪克
刘科研
盛万兴
叶学顺
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a photovoltaic dual-mode self-adaptive cross-platform area absorption method and a system, wherein the method comprises the following steps: acquiring power parameters of each area in a power distribution network system and transmission power of a transformer substation connected with each area, wherein each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics; dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area, wherein the power parameters of each transformer area comprise: load power, photovoltaic power and power transmission power of a power electronic transformer; and dynamically adjusting the power distribution among all the intervals based on a dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers. The invention provides a dual-mode self-adaptive control strategy based on improved droop, and under the premise of not depending on a large-scale communication system, coordinated operation of multiple intervals and cross-area mutual compensation are realized.

Description

Photovoltaic dual-mode self-adaptive cross-cell consumption method and system
Technical Field
The invention relates to the technical field of power control of a power distribution network, in particular to a photovoltaic dual-mode self-adaptive cross-station area absorption method and system.
Background
With the access of a large-scale distributed new power supply to a power distribution network, the power distribution network is used as a part directly connected with users, an important role of distributing electric energy is played in a power system, the access of the distributed power supply brings risks of overhigh line voltage, line overload, backward flow of tide, protection misoperation and the like, meanwhile, the radial power supply characteristics of the original power distribution network are changed, and the defects of intermittence and volatility of the distributed new power supply cause great challenges to the traditional power distribution network in the aspects of reliability, operation optimization and the like.
2011 north carolina state university provides a system for transmitting and managing renewable electric energy based on the future, and then an alternating current and direct current Power grid structure with a Power Electronic Transformer (PET) as a core is proposed in succession, the Power-voltage coordination control of the PET is used for controlling an alternating current and direct current Power distribution network to have the capacity of promoting local consumption of a distributed Power source, the PET-based alternating current and direct current Power distribution network structure with multiple interconnected zones is used for standby capacity, even if high-permeability distributed photovoltaic occurs in a certain zone, the overall permeability of the whole interconnected Power distribution network is greatly reduced, the dispatching and consumption of the distributed Power source can be realized through centralized control of the Power distribution network, but the real-time perception and dynamic control functions of the Power distribution network under the conditions of communication quality and low communication quality are difficult to ensure in a large-scale Power distribution network.
Disclosure of Invention
Therefore, the photovoltaic dual-mode self-adaptive cross-cell consumption method and system provided by the invention overcome the defect that large-scale distributed photovoltaic consumption is easily influenced by a communication system when the distributed photovoltaic consumption depends on centralized scheduling of a power distribution network.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a photovoltaic dual-mode adaptive cross-cell area absorption method, including:
acquiring power parameters of each area in a power distribution network system and transmission power of a transformer substation connected with each area, wherein each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics;
dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area, wherein the power parameters of each transformer area comprise: load power, photovoltaic power and power transmission power of a power electronic transformer;
and dynamically adjusting the power distribution among all the intervals based on a dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers.
In one embodiment, the operating state of the ac/dc distribution network includes: no photovoltaic/local area port internal consumption, local area alternating/direct current port mutual compensation consumption, cross-area mutual compensation consumption and grid-connected consumption.
In one embodiment, the cross-platform-area mutual-economic-consumption operation state is determined according to the following formula:
Pi>0, and
Figure BDA0002546001160000021
the grid connection consumption running state is judged according to the following formula:
Pi>0, and
Figure BDA0002546001160000022
wherein, Pi＝Ppv-Pload,i＝1,2…n，ppvIs the photovoltaic power in the region of the station, ploadAnd I represents the station area number, and I is a station area number set in the power distribution network.
In one embodiment, the power electronic transformer includes: a power grid port, a direct current port, an alternating current port and an interconnection port.
In an embodiment, the step of dynamically adjusting power distribution among the intervals according to the operating states of the ac/dc distribution networks of different power electronic transformers based on a dual-mode adaptive control method for improving droop control includes:
according to the power parameters of each station area, based on the operation states of cross-station mutual economy and grid-connected economy, the working mode of the interconnection port is judged, and the working mode of the interconnection port comprises the following steps: the interconnection port operates in an output power mode, and the interconnection port operates in an absorption power mode;
the interconnection port is based on a transmission factor delta P and a compensation factor when operating in an output power modeiAnd transmitting the deviation power between the areas, and when the interconnection port operates in the absorbed power mode, enabling the interconnection port to realize reasonable distribution of the absorbed power according to the unbalanced power proportion of the areas based on the unbalanced power factor β.
In one embodiment, the interconnect port operates in an output power mode based on a transmission factor Δ P and a compensation factoriModifying the droop control curve, and transmitting the deviation power of each station interval, wherein the method comprises the following steps:
the transmission factor Δ P is calculated by the following formula:
ΔP＝Pi，
calculating a compensation factor by the following formulai：
Figure BDA0002546001160000031
The transmission factor Δ P and the compensation factor are calculated by the following formulaiModifying the droop control curve:
Figure BDA0002546001160000032
wherein, UdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure BDA0002546001160000033
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve.
In an embodiment, when the interconnection port operates in the absorbed power mode, based on the unbalanced power factor β, the step of enabling the interconnection port to reasonably distribute the absorbed power according to the unbalanced power proportion of each cell includes:
the imbalance power factor β is calculated by the following equation:
Figure BDA0002546001160000041
based on the unbalanced power factor beta, calculating the distribution value of the absorbed power of the interconnection port according to the unbalanced power proportion of each station area by the following formula:
Figure BDA0002546001160000042
wherein, PN_iRated capacity, U, for the interconnection port of a platformdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure BDA0002546001160000043
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve.
In a second aspect, an embodiment of the present invention provides a photovoltaic dual-mode adaptive cross-cell area absorption system, including:
the parameter acquisition module is used for acquiring power parameters of each area in the power distribution network system and transmission power of a transformer substation connected with each area, and each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics;
the state division module is used for dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area;
and the power adjusting module is used for dynamically adjusting the power distribution among all the intervals based on the dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers.
In a third aspect, an embodiment of the present invention provides a terminal, including: the photovoltaic dual-mode adaptive cross-site accommodation method comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor executes the photovoltaic dual-mode adaptive cross-site accommodation method according to the first aspect of the embodiment of the invention.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions for causing a computer to execute the photovoltaic dual-mode adaptive cross-cell absorption method according to the first aspect of the present invention.
The technical scheme of the invention has the following advantages:
the photovoltaic dual-mode self-adaptive cross-platform area elimination method and system provided by the invention have the advantages that under the real-time sensing function of an information physical system, the provided dual-mode self-adaptive method is adopted, cross-platform area power mutual aid is automatically realized through a medium-voltage direct-current bus, the sag-improved dual-mode self-adaptive control strategy is provided, and by introducing a transmission factor and an imbalance factor, under the premise of not depending on a large-scale communication system, multi-platform area coordinated operation and cross-platform area mutual aid elimination can be realized only according to the voltage of the interconnected medium-voltage direct-current bus, the smooth switching among multiple states is ensured, and the photovoltaic dual-mode self-adaptive cross-platform area elimination method and system have higher social benefit and.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a photovoltaic dual-mode adaptive cross-cell absorption method according to an embodiment of the present invention;
fig. 2 is a topology structure diagram of a power electronic transformer of the photovoltaic dual-mode adaptive cross-platform area absorption method according to the embodiment of the present invention;
fig. 3 is a diagram of a power distribution network architecture of each power electronic transformer in a power distribution network system of the photovoltaic dual-mode adaptive cross-site area consumption method according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a physical information system of a multi-cell interconnected ac/dc distribution network in a photovoltaic dual-mode adaptive cross-cell consumption method according to an embodiment of the present invention;
fig. 5 is a schematic power flow diagram of a power electronic transformer port of a photovoltaic dual-mode adaptive cross-site area absorption method according to an embodiment of the present invention;
fig. 6 is a graph of automatically adjusting droop when an interconnection port of the photovoltaic dual-mode adaptive cross-cell absorption method provided by the embodiment of the present invention operates in an output power state;
fig. 7(a) is a voltage-absorbed power variation graph of an interconnection port operating in a absorbed power state for providing a photovoltaic dual-mode adaptive cross-platform area absorption method according to an embodiment of the present invention;
fig. 7(b) is a graph of droop coefficient-absorbed power variation when an interconnection port of a photovoltaic dual-mode adaptive cross-station absorption method provided by an embodiment of the present invention operates in a power absorption state;
fig. 8(a) to 8(c) are diagrams illustrating power flow states of four ports of each cell in a photovoltaic dual-mode adaptive cross-cell absorption method according to an embodiment of the present invention;
fig. 9(a) is a power flow state diagram of four ports when a load of a certain area fluctuates under the control of the photovoltaic dual-mode adaptive cross-area absorption method provided in the embodiment of the present invention;
fig. 9(b) is a power flow state diagram of four ports when the load of a certain area fluctuates in the ordinary droop control method according to the embodiment of the present invention;
fig. 10 is a block diagram of a photovoltaic dual-mode adaptive cross-platform area accommodating system according to an embodiment of the present invention;
fig. 11 is a composition diagram of a specific example of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The method for optimizing the classifier chain tag sequence provided by the embodiment of the invention, as shown in fig. 1, comprises the following steps:
step S1: acquiring power parameters of each area in a power distribution network system and transmission power of a transformer substation connected with each area, wherein each area in the power distribution network system comprises: the power electronic transformer, the distribution system alternating current-direct current load, distributed photovoltaic.
In the embodiment of the present invention, as shown in fig. 2, the power electronic transformer includes 4 ports, a grid port, a dc port, an ac port, and an interconnection port. The power grid port is controlled by constant voltage, and is composed of a cascade H bridge and an isolated double-active-bridge converter, and the voltage of a 10kV bus of a power distribution station is reduced to 750V direct current by adopting an input-series output parallel structure; the direct current port is controlled by constant voltage, and a buck-boost converter is adopted to control the direct current voltage to 400V, so that the access of direct current load and photovoltaic can be realized; the AC port adopts a bridge inverter to invert 750V direct current into 380V power frequency alternating current, so that access of an AC load and photovoltaic can be realized, and stable voltage and frequency are provided for the AC load; the interconnection port adopts an isolated double-active-bridge converter to boost the 750V direct current to 20kV medium-voltage direct current, so that medium-voltage interconnection of a plurality of power electronic transformers through the interconnection port is realized.
In the embodiment of the invention, the power electronic transformers in each area are interconnected through the medium-voltage direct-current bus, and the situation perception and dynamic control functions of each port of the power electronic transformers are relied on, so that the information physical system of the power distribution network is realized. As shown in fig. 3, in the distribution network architecture of each power electronic transformer in the distribution network system, an alternating current/direct current (AC/DC) load and distributed photovoltaics are connected to a power network through a plurality of power electronic transformers to form a cross-distribution-area interconnected physical system of information of the alternating current/direct current distribution network based on the power electronic transformers, and each physical distribution area comprises one power electronic transformer, the alternating current/direct current (AC/DC) load and the distributed photovoltaics; connecting the power electronic transformer of each transformer area with a power distribution 10kV transformer substation to access a power distribution network, and selecting a corresponding power distribution transformer substation in practical application by taking the example as an example and not by taking the example as a limitation; the interconnection ports of the power electronic transformers in each area are interconnected through 20kV medium-voltage direct-current buses, which are taken as an example only and not taken as a limitation, and corresponding medium-voltage direct-current buses are selected in practical application.
In the embodiment of the invention, the power parameters of each area in the distribution network system and the transmission power of the transformer substation connected with each area are obtained, modeling can be performed by accessing the distributed photovoltaic into the power flow of the PET-based AC/DC distribution network, as shown in FIG. 4, a multi-area interconnection AC/DC distribution network information physical system formed by PET, the distributed photovoltaic can be accessed into PET through a DC port or an AC port to realize grid connection, and a plurality of PET are interconnected through a DC 20kV bus, so that the interconnection and mutual aid capability among a plurality of PET is expanded.
Step S2: dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area, wherein the power parameters of each transformer area comprise: load power, photovoltaic power, and power delivered by a power electronic transformer.
In the embodiment of the invention, as shown in fig. 5, a port power flow schematic diagram of a power electronic transformer based on power flow modeling of a PET (positron emission tomography) -based AC/DC distribution network, wherein P isiThe method is characterized in that the method is based on the difference value of photovoltaic power and load power in an alternating current hybrid power distribution network region of a power electronic transformer:
Pi＝Ppv-Ploadi＝1,2…n，
wherein i represents the number of the station area, n represents the number of the station area, ppvIs the photovoltaic power in the region of the station, ploadIn order to be the power of the load,
Figure BDA0002546001160000091
the power of the 10kV transformer substation is injected into the transformer area, the injection power is positive, and the initial value is
Figure BDA0002546001160000092
Figure BDA0002546001160000033
Injecting 20kV medium-voltage direct-current bus power into the power electronic transformer, wherein the injected power is positive and the initial value is 0;
Figure BDA0002546001160000094
the rated capacity of the power electronic transformer is obtained.
In an embodiment of the present invention, the operating state of the ac/dc power distribution network includes: no photovoltaic/local area port internal absorption (S)1) The mutual compensation between the AC/DC ports of the local area (S)2) Cross-region mutual-aid digestion (S)3) And grid-connected consumption (S)4) Among them, this example studies the cross-region reciprocity (S)3) And grid-connected consumption (S)4) Two operation states are judged according to corresponding formulas, and cross-station mutual compensation is carried out (S)3) The running state is judged according to the following formula:
Pi>0, and
Figure BDA0002546001160000101
grid-connected consumption (S)4) The running state is judged according to the following formula:
Pi>0, and
Figure BDA0002546001160000102
wherein, Pi＝Ppv-Pload,i＝1,2…n，ppvIs the photovoltaic power in the region of the station, ploadAnd I represents the station area number, and I is a station area number set in the power distribution network.
Step S3: and dynamically adjusting the power distribution among all the intervals based on a dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers.
In the embodiment of the invention, the step of dynamically adjusting the power distribution among all the intervals according to the running states of the alternating current-direct current distribution networks of different power electronic transformers and based on the dual-mode adaptive control method for improving droop control comprises the following steps: according to the power parameters of each station area, based on the operation states of cross-station mutual economy and grid-connected economy, the working mode of the interconnection port is judged, and the working mode of the interconnection port comprises the following steps: the interconnection port operates in an output power mode, and the interconnection port operates in an absorption power mode, in practice, when Δ P is greater than or equal to 0, the interconnection port operates in the output power mode, and when Δ P is less than 0, the interconnection port operates in the absorption power mode.
In practice, a calculation formula for realizing voltage stability of the traditional droop control PET interconnection port is calculated:
Figure BDA0002546001160000103
wherein, UdeFor actually acquired voltage values, UdcrefK is the slope of the predetermined voltage-power curve. If all the traditional droop curves of the interconnection port converter are available, although the voltage of the interconnection direct-current bus can be controlled, when residual power appears in the transformer area, the voltage of the interconnection bus has no influence, and the interconnection port converter cannot realize the transmission of the residual photovoltaic power between the transformer areas.
In embodiments of the present invention, when the interconnect port is operating in an output power mode, at this time,
Figure BDA0002546001160000111
more than or equal to zero, modifying a calculation formula for realizing voltage stabilization of the traditional droop control PET interconnection port, actively transmitting the excess power to a direct current bus, further transmitting the excess power to other distribution areas, and providing a calculation formula based on a transmission factor delta P and a compensation factoriModifying the droop control curve, and transmitting the deviation power of each station interval, wherein the method comprises the following steps:
the transmission factor Δ P is calculated by the following formula:
ΔP＝Pi，
calculating a compensation factor by the following formulai：
Figure BDA0002546001160000112
The transmission factor Δ P and the compensation factor are calculated by the following formulaiModifying the droop control curve:
Figure BDA0002546001160000113
wherein, UdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure BDA0002546001160000114
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve.
In an embodiment of the present invention, when the interconnect port is operating in the absorbed power mode, at this time,
Figure BDA0002546001160000115
when the output power of the PET interconnection port is less than zero, the bus voltage rises, the traditional droop control can realize power absorption according to bus voltage fluctuation, but the traditional droop control generally sets a coefficient according to the capacity of an interconnection converter, the droop coefficient is fixed, the defects of low direct-current voltage quality, poor power distribution characteristic and the like exist, aiming at the defects, the embodiment of the invention provides a step of enabling the interconnection port to realize reasonable distribution of the absorption power according to the unbalanced power proportion of each transformer area based on an unbalanced power factor β, and the step comprises the following steps:
the imbalance power factor β is calculated by the following equation:
Figure BDA0002546001160000121
based on the unbalanced power factor beta, calculating the distribution value of the absorbed power of the interconnection port according to the unbalanced power proportion of each station area by the following formula:
Figure BDA0002546001160000122
wherein, PN_iRated capacity, U, for the interconnection port of a platformdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure BDA0002546001160000123
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve. And realizing reasonable distribution of absorbed power of the interconnection ports according to the unbalanced power proportion of each transformer area under the condition that the direct-current voltage variation is the same.
In the embodiment of the present invention, a dual-mode Adaptive Control strategy (DBAC) is represented by the following formula:
Figure BDA0002546001160000124
in the embodiment of the invention, the voltage of the medium-voltage direct-current bus is set as a global variable by the dual-mode self-adaptive control method, the sending end actively sends the residual power of the transformer area to the interconnected medium-voltage direct-current bus to cause the direct-current voltage to rise, the receiving end reasonably distributes the power output by the sending end according to the unbalanced power of the transformer area, the power regulation relation is determined by the unbalanced power and the allowable fluctuation amount of the voltage, the droop coefficient is flexibly regulated in real time, and the condition that the voltage fluctuation of the medium-voltage direct-current bus does not exceed the operation. Each station area PET automatically senses the voltage amplitude of the medium-voltage bus under the support of an information physical system, the transmission power of the interconnection port can be decided in real time according to local information, the mutual control and restriction relation does not exist, the expandability of the station areas is strong, and the dependence on a communication system is reduced.
According to the photovoltaic dual-mode self-adaptive cross-platform area elimination method provided by the embodiment of the invention, under the real-time sensing function of an information physical system, the DBAC method is adopted, cross-platform area power mutual aid is automatically realized through a medium-voltage direct-current bus, a dual-mode self-adaptive control strategy based on sag improvement is provided, and by introducing a transmission factor and an imbalance factor, under the premise of not depending on a large-scale communication system, coordinated operation of multiple intervals and cross-platform area mutual aid elimination can be realized only according to the voltage of the interconnected medium-voltage direct-current bus, and smooth switching among multiple states is ensured, so that the photovoltaic dual-mode self-adaptive cross-platform area elimination method has higher social benefit and economic benefit.
In one embodiment, as shown in fig. 6, the interconnection port operates in an output power state, the sum of loads inside the PET detection station and the sum of output of the distributed power supply determine the power surplus condition of the station, and automatically adjust the droop curve, when the interconnection port operates in an output photovoltaic power state, the operation point is shifted from an initial stable point (0, 20) to B, the interconnection port starts to inject power into the medium voltage dc bus, which inevitably causes the dc bus voltage to increase, so that the system first stably operates at a point B 'and passes through a point B' to pass throughiAfter correction, the adjustment without difference is realized, and finally the operation is carried out at the point B'. On the premise of ensuring the voltage stability of the interconnected bus, the method can be flexibly adjusted, and the output of the residual photovoltaic power is realized.
In one embodiment, as shown in fig. 7(a), the interconnection port operates in a power absorption state, and the absorbed power can be reasonably distributed according to the unbalanced power ratio under the same dc voltage; as shown in fig. 7(b), the relationship between the droop coefficient and the absorption power is specifically described, and the proportional relationship between the droop coefficients ensures that the absorption power can be reasonably distributed according to the proportion of the unbalance power for different initial unbalance powers.
In a specific embodiment, a plurality of scenes are selected, and the control effect of simulating the scene of the power distribution network with 3 interconnected distribution areas is as follows:
the maximum power of the interconnection port of each region is set to be 200kW, the voltage reference value of the direct current bus is set to be 20kV, the voltage deviation of the direct current bus is controlled to be +/-5%, and the coefficient K is-200.
Example 1: when the DBAC method proposed in the embodiment of the present invention is applied to simulation, simulation parameters of each cell are shown in the following table, as shown in fig. 8(a), a port power flow state of the cell 1, as shown in fig. 8(b), a port power flow state of the cell 2, and as shown in fig. 8(c), a port power flow state of the cell 3.
Figure BDA0002546001160000141
In example 1, four operating states and their transitions were simulated. 0-9.8S is state S1Or S2That is, the photovoltaic power in each station area is less than the load power (the low-ratio photovoltaic access PET implementation will not be discussed herein); 9.8S-13S is state S3The interconnection port of the station area 1 operates in the self-adaptive working mode 1, the interconnection port of the station area 2 operates in the self-adaptive working mode 2, the interconnection port of the station area 3 operates in the self-adaptive working mode 2, 35kw of residual photovoltaic power in the station area 1 flows to the station area 2, 22kw flows to the station area 3, and absorption is realized; 13S-13.4S, the photovoltaic of the transformer area 1 quits operation, the transformer area 1 becomes a power shortage transformer area, the photovoltaic power of the transformer area 2 is gradually increased but still less than the load power, and the state S is1Or S2(ii) a 13.4s-15.1s, zone 2 becomes the power surplus zone, and zone 2 starts to deliver power 40kw and 23kw to zone 1 and zone 3, respectively. 15.1S-16.2S is state S4And when 15.1s, the photovoltaic of the distribution area 1 is accessed to the power distribution network again, so that the photovoltaic power in the power distribution network exceeds the total load power, and under the control strategy, the photovoltaic power is automatically connected to the grid to complete the absorption. 16.2S-24S, state S is entered again1Or S2。
Example 2: and simulating the load fluctuation in the platform area 2, keeping other parameters consistent with those of the calculation example 1, and setting a DBAC method and a droop method to obtain a power flow result of the platform area 2.
In example 2, as shown in fig. 9(a), when the amount of unbalance of the receiving-end land area changes, the adaptive control coefficient changes accordingly. When the load of the station area is reduced for 12s, the absorption power of the station area is reduced in an adaptive mode, and when the load of the station area is increased for 13s, the absorption power of the station area is increased. As shown in fig. 9(b), in the conventional droop control, the coefficient is set to be a constant value, and cannot react to the load fluctuation in the station area, and the adaptive capacity is poor. The DBAC method can distribute power among the transformer areas according to the unbalance amount, has good dynamic performance, does not need communication among the transformer areas, and has strong expandability of the transformer areas.
The following examples 1 show: with the change of the photovoltaic power, the state of the transformer area as a receiving end or a transmitting end can be switched, and the DBAC method has the multi-state regulation capability.
The examples 1 and 2 show that: the DBAC method has dynamic regulation capability and strong self-adaptive capability.
According to the power optimization distribution method for cross-district photovoltaic power consumption provided by the embodiment of the invention, through the control effect of the scene of the power distribution network with 3 interconnected districts, in a multi-district power distribution network information physical system based on PET interconnection, transmission factors and imbalance factors are introduced aiming at the interconnection ports of PET, a droop-improved dual-mode adaptive control algorithm is adopted, along with the change of photovoltaic power, the state of the district as a receiving end or a sending end can be switched, and the DBAC method has dynamic regulation capability and strong adaptive capability.
Example 2
An embodiment of the present invention provides a photovoltaic dual-mode adaptive cross-platform area absorption system, as shown in fig. 10, including:
the parameter acquisition module 1 is used for acquiring power parameters of each area in the power distribution network system and transmission power of a transformer substation connected with each area, and each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics; this module executes the method described in step S1 in embodiment 1, and is not described herein again.
The state division module 2 is used for dividing the running state of an alternating current-direct current distribution network of the power electronic transformer according to the power parameters of each transformer area; this module executes the method described in step S2 in embodiment 1, and is not described herein again.
The power adjusting module 3 is used for dynamically adjusting the power distribution among all the intervals based on a dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current power distribution networks of different power electronic transformers; this module executes the method described in step S3 in embodiment 1, and is not described herein again.
The embodiment of the invention provides a photovoltaic dual-mode self-adaptive cross-platform area consumption system, provides a dual-mode self-adaptive control strategy based on sag improvement under the real-time sensing function of an information physical system, and realizes cross-platform area power mutual aid through a medium-voltage direct-current bus, and can realize multi-platform area coordinated operation and cross-platform area mutual aid consumption only according to the voltage of the interconnected medium-voltage direct-current bus without depending on a large-scale communication system by introducing a transmission factor and an imbalance factor, and ensure smooth switching among multiple states.
Example 3
An embodiment of the present invention provides a terminal, as shown in fig. 11, including: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, memory 404, and at least one communication bus 402. Wherein a communication bus 402 is used to enable connective communication between these components. The communication interface 403 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a standard wireless interface. The Memory 404 may be a high-speed RAM Memory (Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 404 may optionally be at least one memory device located remotely from the processor 401. Wherein the processor 401 may perform the photovoltaic dual-mode adaptive cross-site accommodation method in embodiment 1. A set of program codes is stored in the memory 404 and the processor 401 invokes the program codes stored in the memory 404 for performing the photovoltaic dual mode adaptive cross-site consumption method in embodiment 1. The communication bus 402 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one line is shown in FIG. 11, but this does not represent only one bus or one type of bus. The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above. The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviation: HDD), or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above.
The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The aforementioned PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 404 is also used to store program instructions. The processor 401 may call program instructions to implement the photovoltaic dual-mode adaptive cross-cell absorption method in embodiment 1 as described in this application.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer-executable instruction is stored on the computer-readable storage medium, and the computer-executable instruction may execute the photovoltaic dual-mode adaptive cross-cell absorption method in embodiment 1. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard disk (Hard disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (10)

1. A photovoltaic dual-mode self-adaptive cross-cell absorption method is characterized by comprising the following steps:
acquiring power parameters of each area in a power distribution network system and transmission power of a transformer substation connected with each area, wherein each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics;
dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area, wherein the power parameters of each transformer area comprise: load power, photovoltaic power and power transmission power of a power electronic transformer;
and dynamically adjusting the power distribution among all the intervals based on a dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers.
2. The photovoltaic dual-mode adaptive cross-cell consumption method according to claim 1, wherein the operating state of the ac/dc distribution network comprises: no photovoltaic/local area port internal consumption, local area alternating/direct current port mutual compensation consumption, cross-area mutual compensation consumption and grid-connected consumption.
3. The photovoltaic dual-mode adaptive cross-site absorption method of claim 2,
the cross-platform area mutual-aid consumption running state is judged according to the following formula:
Piis greater than 0, and
Figure FDA0002546001150000011
the grid connection consumption running state is judged according to the following formula:
Piis greater than 0, and
Figure FDA0002546001150000012
wherein, Pi＝Ppv-Pload，i＝1，2...n，ppvIs the photovoltaic power in the region of the station, ploadAnd I represents the station area number, and I is a station area number set in the power distribution network.
4. The photovoltaic dual-mode adaptive cross-site area absorption method according to any one of claims 1 to 3, wherein the power electronic transformer comprises: a power grid port, a direct current port, an alternating current port and an interconnection port.
5. The photovoltaic dual-mode adaptive cross-station area consumption method according to claim 4, wherein the step of dynamically adjusting power distribution among the station areas based on a dual-mode adaptive control method for improving droop control according to the operating state of the alternating current/direct current distribution network of different power electronic transformers comprises:
according to the power parameters of each station area, based on the operation states of cross-station mutual economy and grid-connected economy, the working mode of the interconnection port is judged, and the working mode of the interconnection port comprises the following steps: the interconnection port operates in an output power mode, and the interconnection port operates in an absorption power mode;
the interconnection port operatesBased on the transmission factor Δ P and the compensation factor in the output power modeiAnd transmitting the deviation power between the areas, and when the interconnection port operates in the absorbed power mode, enabling the interconnection port to realize reasonable distribution of the absorbed power according to the unbalanced power proportion of the areas based on the unbalanced power factor β.
6. The photovoltaic dual-mode adaptive cross-site absorption method according to claim 5, wherein the interconnection port is based on a transmission factor Δ P and a compensation factor when operating in an output power modeiModifying the droop control curve, and transmitting the deviation power of each station interval, wherein the method comprises the following steps:
the transmission factor Δ P is calculated by the following formula:
ΔP＝Pi，
calculating a compensation factor by the following formulai：
Figure FDA0002546001150000021
The transmission factor Δ P and the compensation factor are calculated by the following formulaiModifying the droop control curve:
Figure FDA0002546001150000022
wherein, UdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure FDA0002546001150000031
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve.
7. The photovoltaic dual-mode self-adaptive cross-site absorption method according to claim 5, wherein the step of enabling the interconnection port to reasonably distribute the absorption power according to the unbalanced power proportion of each site based on the unbalanced power factor β when the interconnection port operates in the absorption power mode comprises:
the imbalance power factor β is calculated by the following equation:
Figure FDA0002546001150000032
based on the unbalanced power factor beta, calculating the distribution value of the absorbed power of the interconnection port according to the unbalanced power proportion of each station area by the following formula:
Figure FDA0002546001150000033
wherein, PN_iRated capacity, U, for the interconnection port of a platformdeFor actually acquired voltage values, UdcrefIs a preset voltage value, and is a preset voltage value,
Figure FDA0002546001150000034
and injecting power of a medium-voltage direct-current bus into the power electronic transformer, wherein K is the slope of a preset voltage-power curve.
8. A photovoltaic dual-mode adaptive cross-cell absorption system, comprising:
the parameter acquisition module is used for acquiring power parameters of each area in the power distribution network system and transmission power of a transformer substation connected with each area, and each area in the power distribution network system comprises: the system comprises a power electronic transformer, a distribution system AC/DC load and distributed photovoltaics;
the state division module is used for dividing the running state of an alternating current-direct current power distribution network of the power electronic transformer according to the power parameters of each transformer area;
and the power adjusting module is used for dynamically adjusting the power distribution among all the intervals based on the dual-mode adaptive control method for improving droop control according to the running states of the alternating current-direct current distribution networks of different power electronic transformers.
9. A terminal, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the photovoltaic dual mode adaptive cross-site mitigation method of any of claims 1-7.
10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the method of pv dual-mode adaptive cross-site absorption of any of claims 1-7.
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