WO2024001201A1 - 低压台区分相输出功率调节系统、调节方法及存储介质 - Google Patents

低压台区分相输出功率调节系统、调节方法及存储介质 Download PDF

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Publication number
WO2024001201A1
WO2024001201A1 PCT/CN2023/075843 CN2023075843W WO2024001201A1 WO 2024001201 A1 WO2024001201 A1 WO 2024001201A1 CN 2023075843 W CN2023075843 W CN 2023075843W WO 2024001201 A1 WO2024001201 A1 WO 2024001201A1
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Prior art keywords
phase
power
split
station area
adjustment module
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PCT/CN2023/075843
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English (en)
French (fr)
Inventor
杨金东
刘红文
荣飞
钱国超
唐立军
黄继盛
Original Assignee
云南电网有限责任公司电力科学研究院
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Publication of WO2024001201A1 publication Critical patent/WO2024001201A1/zh

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Definitions

  • the invention relates to the field of power quality control of electric power systems, and in particular to a low-voltage station phase-differentiated output power adjustment system, an adjustment method and a storage medium.
  • High-quality power quality is the prerequisite for ensuring high-quality economic power supply for users. With the development of social economy and the improvement of people's living standards, production enterprises and residents have increasingly higher requirements for power quality.
  • the low-voltage station area of the domestic distribution network uses three-phase four-wire power supply. Due to the disordered access of single-phase loads and inconsistent power consumption timing, the three-phase distribution network system is generally unbalanced. At present, a large number of distributed low-voltage photovoltaics are connected to the distribution network area, which further aggravates the three-phase imbalance in the area. Problems such as low voltage and increased line loss have become increasingly prominent. In severe cases, single-phase overload and burnout of distribution transformers have affected residents. Electricity used for normal production and living.
  • the patent "Three-phase unbalance control device for low-voltage lines based on three-phase four-wire photovoltaic inverter" proposes a special photovoltaic inverter using a three-phase four-wire system to connect the light-loaded phases of the grid through an input switch and output The switch connects the heavily loaded phases of the power grid, adjusts the power balance between the light-loaded and heavy-loaded phases, and achieves three-phase unbalance control.
  • the above methods all have a serious shortcoming: they cannot completely suppress the negative sequence and zero sequence currents on the line and achieve full compensation of unbalanced currents. They can only reduce the system imbalance to a certain extent and cannot fully realize the three distribution transformers. phase equilibrium.
  • the present invention proposes a phase-differentiated output power adjustment system for low-voltage stations, including:
  • Regulating power supply 10 split-phase power adjustment module 20, sub-controller 30, main controller 40;
  • Pt is the power required to meet the three-phase current imbalance control of the distribution transformer
  • P G1 , P G2 ...P Gn is the power emitted by each of the regulated power supplies to compensate for the three-phase current imbalance in the station area
  • the split-phase power adjustment module is connected to the three-phase lines A, B, and C in the station area and the neutral line N;
  • the sub-controller is connected to the regulating power supply, and the sub-controller communicates with the main controller to control the power emitted by each regulating power supply to compensate for the unbalanced three-phase current in the station area.
  • the split-phase power adjustment module includes a first filter capacitor, a second filter capacitor, a three-phase reactor and a three-phase full-bridge inverter;
  • the first filter capacitor and the second filter capacitor are connected to the power grid between the neutral line of the power grid and the three-phase full-bridge inverter device, and the three-phase reactor is connected to the three-phase full-bridge inverter device. between the three-phase lines of the generator and the power grid;
  • the inductance values of the first filter capacitor, the second filter capacitor and the three-phase reactor are determined by the capacity and filtering effect.
  • the sub-controller communicates with the main controller through wireless or carrier mode, and the sub-controller is electrically connected to the split-phase power adjustment module for collecting the corresponding split-phase power adjustment module and The power and voltage of each phase of the network point are uploaded to the main controller, and the control amount calculated by the main controller is sent to the corresponding phase-phase power adjustment module to control the output of the phase-phase power adjustment module to the main controller.
  • the controller adjusts the power accordingly.
  • the main controller is used to collect the voltage and current of phase A, phase B and phase C in the station area, Calculate the three-phase power of A-phase, B-phase and C-phase that the split-phase power adjustment module should output based on the voltages and currents of the A-phase, B-phase and C-phase;
  • Pa is the phase A power of the station area
  • Ua is the phase A voltage at the head end of the station area
  • ia is the phase A current of the head end of the station area
  • P b is the phase B power of the station area
  • U b is the phase B voltage at the head end of the station area
  • i b is the B-phase current at the first end of the station area
  • P b is the B-phase power at the station area
  • U b is the B-phase voltage at the first end of the station area
  • i b is the B-phase current at the first end of the station area
  • the power calculation formula that the jth regulated power supply after node i needs to supplement to the three phases of the station area A, B, and C is as follows:
  • n is the number of regulated power supplies participating in the regulation.
  • the optimal output values Pxa, Pxb, Pxc, Qxa, Qxb and Qxc of the split-phase power adjustment module are based on PSO while ensuring the minimum voltage difference between nodes. Obtained by optimization algorithm;
  • )/3*K1 A;
  • the objective function corresponding to the PSO optimization algorithm is:
  • ⁇ U mj is the voltage difference between node m and node m-1 after distributed power supply and energy storage participate in unbalanced adjustment
  • k is the total number of regulated power supplies connected to the station area
  • Pi is the nodes in the backend area of node i.
  • the power of , r is the resistance corresponding to the unit length line in the station area, x is the corresponding reactance of the unit length line in the station area, and lm is the line length from the head end of the station area to node i.
  • the unbalanced reference currents I a_ref , I b_ref and I c_ref output by the split-phase power adjustment module are determined by Determined by the following formula:
  • the negative sequence current and zero sequence current that need to be compensated are calculated by decomposing the unbalanced current sequence components that the split-phase power adjustment module needs to output.
  • I a * , I b * , and I c * are the filter capacitor voltage controls of the split-phase power adjustment module. Portion.
  • the filter capacitor voltage control components of the split-phase power adjustment module are I a * , I b * , and I c * obtained by the following method:
  • the voltage difference is output as the d-axis active component of dq/abc transformation after passing through the PI controller;
  • /u aj I bj
  • /u bj I cj
  • u aj , u bj , and u cj are the A, B, and C three-phase voltages of node j respectively.
  • the present invention also proposes a low-voltage station phase-differentiated output power adjustment method for use in the system described in any one of the first aspects, including: step S110 to step S170;
  • the present invention also proposes a computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the low-voltage platform phase-differentiated output power adjustment method as described in the second aspect is implemented.
  • the invention uses multiple distributed regulated power supplies in the control area.
  • the regulated power supplies include distributed photovoltaic and distributed small energy storage power sources in the stage area. Under the condition of ensuring the minimum voltage deviation in the stage area, the unbalanced current is output. Multiple distributed power supplies Coordinated regulation achieves precise control of three-phase imbalance in the Taiwan area, reduces line losses and improves power quality.
  • the invention realizes the multiplexing of optimal power generation of distributed photovoltaic power sources and three-phase unbalance compensation in the Taiwan area. When the three-phase load balance in the Taiwan area, the photovoltaic power source can be used as a normal power supply to supply power to the load, providing Improved system economy.
  • multiple distributed photovoltaic power sources can be controlled to output three-phase unbalance compensation power and power generation, taking into account the three-phase unbalance control in the Taiwan area and the integration of photovoltaic power generation into the grid. It provides an innovative method for distributed power sources to participate in power regulation in Taiwan areas and supports the construction of new power systems. Realized multiple distributed photovoltaic phase-separated grid-connected power generation to control the three-phase imbalance of power distribution and distribution transformers. This paper proposes a model in which multiple distributed power sources collaboratively participate in the regulation of the station area, which provides a reference control technology for the power disturbance in the station area caused by the high penetration of distributed photovoltaic power sources under the new power system.
  • Figure 1 is a schematic diagram of a low-voltage stage differential phase output adjustment system proposed by an embodiment of the present invention
  • Figure 2 is a structural diagram of a split-phase power adjustment module proposed by an embodiment of the present invention.
  • Figure 3 is a control block diagram of an unbalanced current output method of a split-phase power adjustment module proposed by an embodiment of the present invention
  • Figure 4 is a back-end load side three-phase unbalanced current waveform diagram proposed by the embodiment of the present invention.
  • Figure 5 is a three-phase unbalanced current waveform diagram on the front-end load side proposed by the embodiment of the present invention.
  • Figure 6 is a three-phase full-bridge inverter output current waveform diagram proposed by the embodiment of the present invention.
  • Figure 7 is a current waveform diagram of a transmission line before compensation proposed by the embodiment of the present invention.
  • Figure 8 is a compensated transmission line current waveform diagram proposed by the embodiment of the present invention.
  • Figure 9 is a schematic flow chart of a low-voltage station phase-differentiated output power adjustment method proposed by an embodiment of the present invention.
  • Figure 10 is a schematic structural diagram of the low-voltage ride-through control electronic equipment of the direct-driven fan provided by the embodiment of the present application.
  • the low-voltage station phase-differentiated output power adjustment system provided for the embodiment of the present application includes:
  • Regulating power supply 10 split-phase power adjustment module 20, sub-controller 30, main controller 40;
  • Pt is the power required to meet the three-phase current imbalance control of the distribution transformer
  • P G1 , P G2 ...P Gn is the power generated by each of the regulated power supplies 10 in the station area to compensate for the three-phase current imbalance in the station area. power;
  • the split-phase power adjustment module 20 is connected to the three-phase lines A, B, and C of the station area and the neutral line N;
  • the sub-controller 30 is connected to the regulated power supply 10, and the sub-controller 30 communicates with the main controller 10 to control the power generated by the regulated power supply 10 to compensate for the unbalanced three-phase current in the station area. Rate.
  • the main controller 40 controls multiple split-phase power adjustment modules 20 to control the power input by each regulated power supply 10 to the Taiwan area power grid.
  • the regulated power supply 10 includes Taiwan area distributed photovoltaic, distributed For power sources such as small hydropower, diesel generators, and distributed energy storage, P t is the power required to meet the three-phase current imbalance control of the distribution transformer.
  • the regulated power supply compensates for the three-phase current imbalance in the station area by sending energy to the station area, and regulates When the power supply compensates for the unbalanced three-phase current in the platform area, it can be that the regulated power supply of some nodes emits energy to the platform area, or it can be that the regulated power supply of all nodes emits energy to the platform area.
  • the sub-controller 30 is connected between the regulated power supply connection 10 and the station area power grid through wires.
  • the main controller 10 obtains the voltage and power measured when it is connected according to the split-phase power adjustment module 20, and transmits the above voltage and power to the main controller 10.
  • the main controller 10 sends the control amount to the corresponding
  • the split-phase power adjustment module 20 thereby controls the phase output module to output the adjusted power corresponding to the main controller.
  • the split-phase power adjustment module includes a first filter capacitor 21, a second filter capacitor 22, a three-phase reactor 23 and a three-phase full-bridge inverter 24;
  • the first filter capacitor 21 and the second filter capacitor 22 are connected to the power grid between the neutral line n of the power grid and the three-phase full-bridge inverter device 24, and the three-phase reactor 23 is connected to the three-phase full-bridge inverter device 24. Between the phase full-bridge inverter 24 and the three-phase lines A, B, and C of the power grid;
  • the inductance values of the first filter capacitor 21, the second filter capacitor 22 and the three-phase reactor 23 are determined by the capacity and filtering effect.
  • the sub-controller 30 communicates with the main controller 40 through wireless or carrier mode, and the sub-controller 30 is electrically connected to the split-phase power adjustment module 20 for collecting corresponding The power and voltage of each phase of the grid-connected point of the split-phase power adjustment module 20 are uploaded to the main controller 40, and the control quantity calculated by the main controller 40 is sent to the corresponding split-phase power adjustment module 20 to control all The split-phase power adjustment module 20 outputs the adjustment power corresponding to the main controller.
  • the main controller 40 is used to collect the voltage and current of phase A, phase B and phase C in the station area, and calculate the phase-phase power adjustment according to the voltage and current of phase A, phase B and phase C.
  • Pa is the phase A power of the station area
  • Ua is the phase A voltage at the head end of the station area
  • ia is the phase A current of the head end of the station area
  • P b is the phase B power of the station area
  • U b is the phase B voltage at the head end of the station area
  • i b is the B-phase current at the first end of the station area
  • P b is the B-phase power at the station area
  • U b is the B-phase voltage at the first end of the station area
  • i b is the B-phase current at the first end of the station area
  • the power calculation formula that the jth regulated power supply after node i needs to supplement to the three phases of the station area A, B, and C is as follows:
  • n is the number of regulated power supplies participating in the regulation.
  • the optimal output values Pxa, Pxb, Pxc, Qxa, Qxb and Qxc of the split-phase power adjustment module are Obtained based on PSO optimization algorithm
  • )/3*K1 A;
  • the objective function corresponding to the PSO optimization algorithm is:
  • ⁇ U mj is the voltage difference between node m and node m-1 after distributed power supply and energy storage participate in unbalanced adjustment
  • k is the total number of regulated power supplies connected to the station area
  • Pi is the nodes in the backend area of node i.
  • the power of , r is the resistance corresponding to the unit length line in the station area, x is the corresponding reactance of the unit length line in the station area, and lm is the line length from the head end of the station area to node i.
  • the unbalanced reference currents I a_ref and I b_ref output by the split-phase power adjustment module 20 and I c_ref are determined by:
  • the negative sequence current and zero sequence current that need to be compensated are calculated by decomposing the unbalanced current sequence components that the split-phase power adjustment module 20 needs to output.
  • I a * , I b * , and I c * are the filter capacitor voltages of the split-phase power adjustment module. Control portions.
  • the filter capacitor voltage control components of the split-phase power adjustment module 20 are I a * , I b * , and I c * obtained by the following method:
  • the voltage difference is output as the d-axis active component of dq/abc transformation after passing through the PI controller;
  • FIG. 3 it is a control block diagram of an unbalanced current output method of the split-phase power adjustment module 20 proposed by the embodiment of the present invention.
  • the voltage U dc of the first filter capacitor and the voltage U of the second filter capacitor are dc_ref finds the difference, and then the difference is output through the PI controller as the d-axis of the dq/abc transformation.
  • Power component I d set the dq/abc transformation q-axis reactive power component I q to 0, and convert the active power component I d and reactive component I q through dq/abc transformation to obtain the capacitor voltage control components Ia*, Ib*, Ic *.
  • /u aj I bj
  • /u bj I cj
  • u aj , u bj , and u cj are the A, B, and C three-phase voltages of node j respectively.
  • the present invention controls multiple distributed power supplies in the control area to output unbalanced current under the condition of ensuring the minimum voltage deviation in the station area, and the multiple distributed power supplies coordinately adjust to achieve precise control of the three-phase imbalance in the station area. Reduce line losses and improve power quality.
  • the invention realizes the multiplexing of optimal power generation of distributed photovoltaic power sources and three-phase unbalance compensation in the station area. When the three-phase load balance in the station area, the photovoltaic power source can be used as a normal power supply to supply power to the load, thereby improving the economy of the system.
  • multiple distributed photovoltaic power sources can be controlled to output three-phase unbalance compensation power and power generation, taking into account the three-phase unbalance control in the Taiwan area and the integration of photovoltaic power generation into the grid. It provides an innovative method for distributed power sources to participate in power regulation in Taiwan areas and supports the construction of new power systems. Realized multiple distributed photovoltaic phase-separated grid-connected power generation to control the three-phase imbalance of power distribution and distribution transformers. This paper proposes a model in which multiple distributed power sources collaboratively participate in the regulation of the station area, which provides a reference control technology for the power disturbance in the station area caused by the high penetration of distributed photovoltaic power sources under the new power system.
  • Figure 4 is a three-phase unbalanced current waveform diagram on the backend load side. Its waveform shows that the three-phase current on the backend load side is in an unbalanced state.
  • Figure 5 shows the three-phase unbalanced current waveform on the front-end load side. Its waveform shows that the three-phase current on the front-end load side is in an unbalanced state.
  • Figure 6 shows the output current waveform of the three-phase full-bridge inverter. Its waveform is the compensation current output by the three-phase full-bridge inverter using the control method proposed by the present invention.
  • Figure 7 shows the current waveform of the transmission line before compensation.
  • Figure 8 shows the current waveform of the transmission line after compensation. It can be seen from the figure that the three-phase current of the transmission line is in a balanced state, and the current imbalance is 1.8%. It can be seen from the current waveform diagram that after adopting the low-voltage station phase adjustment system proposed by the present invention, the current imbalance is significantly reduced, which provides a reference for the power disturbance in the station area caused by the high penetration of distributed photovoltaic power sources under the new power system. control technology.
  • this application also proposes a distributed energy storage combined power adjustment method for the system described in the first aspect, which is characterized by including:
  • the embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 320 and executable on the processor.
  • the processor 320 executes the computer program 311. This is the step to implement any method of controlling the outlet temperature of the trough solar collector field.
  • the electronic equipment introduced in this embodiment is the equipment used to implement a trough solar collector field outlet temperature control device in the embodiment of this application, based on the method introduced in the embodiment of this application, those skilled in the art It is possible to understand the specific implementation of the electronic device of this embodiment and its various modifications. Therefore, how the electronic device implements the method in the embodiment of the present application will not be described in detail here. As long as those skilled in the art implement the implementation of the present application, The equipment used in the methods in the examples all fall within the scope of protection sought by this application.
  • embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions
  • the device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device.
  • Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.
  • Embodiments of the present application also provide a computer program product.
  • the computer program product includes computer software instructions.
  • the processing device causes the processing device to execute the low-voltage direct drive fan in the corresponding embodiment as shown in Figure 1.
  • the flow of the traversal control method is not limited to:
  • a computer program product includes one or more computer instructions. When computer program instructions are loaded and executed on a computer, processes or functions according to embodiments of the present application are generated in whole or in part.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., computer instructions may be transmitted from a website, computer, server or data center via a wired link (e.g. Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center.
  • a wired link e.g. Coaxial cable, optical fiber, digital subscriber line (DSL)
  • wireless such as infrared, wireless, microwave, etc.
  • Computer-readable storage media can be any available media that a computer can store, or a data storage device such as a server or data center integrated with one or more available media. Available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (SSD)), etc.
  • Available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (SSD)), etc.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • a unit described as a separate component may or may not be physically separate.
  • a component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • Integrated units may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as independent products.
  • the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code. .

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Abstract

本发明实施例公开了一种低压台区分相输出功率调节系统、调节方法及存储介质。该系统包括：调节电源，分相功率调节模块，分控制器，主控制器；所述调节电源与所述分相功率调节模块连接，所述调节电源的总功率P满足下式关系：P＝Pt＝PG1+PG2+…PGn；其中，Pt为满足配电变压器三相电流不平衡调控所需的功率，PG1、PG2…PGn为每个所述调节电源为补偿台区三相电流不平衡发出的功率；所述分相功率调节模块与台区A、B、C三相线路及中性线N连接；所述分控制器与所述调节电源连接，所述分控制器与所述主控制器进行通讯以控制每个所述调节电源为补偿台区三相电流不平衡发出的功率。多个分布式电源协同调节，实现台区三相不平衡的精准治理，降低了线路损耗，提高了电能质量。

Description

低压台区分相输出功率调节系统、调节方法及存储介质 技术领域
本发明涉及电力系统电能质量控制领域，尤其涉及一种低压台区分相输出功率调节系统、调节方法及存储介质。
背景技术
优质的电能质量是保障用户优质经济供电的前提，随着社会经济发展及人民生活水平的提高，各生产企业和居民对电能质量的要求越来越高。国内配电网低压台区以三相四线供电，因单相负荷接入无序，及用电时序不一致，导致配电网系统的三相普遍不平衡。目前，大量分布式低压光伏接入配电网台区，使得台区三相不平衡度进一步加剧，低电压、线损增加等问题日益凸显，严重时引发配变单相过载烧毁，影响了居民正常生产生活用电。
目前，针对配电网三相不平衡的问题，专利《一种低压电网三相不平衡电流补偿方法与装置》(CN105406494A)提出一种采用单相APF有源滤波器输出与相电流大小相等方向相反的电流值补偿零序电流的方法。专利《基于三相四线光伏逆变器的低压线路三相不平衡治理装置》(CN21404544U)提出一种采用三相四线制的专用光伏逆变器通过输入开关连通电网负载轻的相，输出开关连通电网负载重的相，调节轻载、重载两相之间的功率平衡，实现三相不平衡治理的方法。然而，上述方法都存在一个比较严重的缺点：并不能完全抑制线路上的负序、零序电流，实现不平衡电流全补偿，只能一定程度上降低系统不平衡度，无法完全实现配变三相平衡。
申请内容
在发明内容部分中引入了一系列简化形式的概念，这将在具体实施方式部分中进一步详细说明。本发明的发明内容部分并不意味着要试图限定出所要求 保护的技术方案的关键特征和必要技术特征，更不意味着试图确定所要求保护的技术方案的保护范围。
为了克服现有技术的缺陷，有效解决配电网三相不平衡难题，第一方面，本发明提出低压台区分相输出功率调节系统，包括：
调节电源10，分相功率调节模块20，分控制器30，主控制器40；
所述调节电源与所述分相功率调节模块连接，所述调节电源的总功率P满足下式关系：
P＝Pt＝PG1+PG2+...PGn
其中，Pt为满足配电变压器三相电流不平衡调控所需的功率，PG1、PG2…PGn为每个所述调节电源为补偿台区三相电流不平衡发出的功率；
所述分相功率调节模块与台区A、B、C三相线路及中性线N连接；
所述分控制器与所述调节电源连接，所述分控制器与所述主控制器进行通讯以控制每个所述调节电源为补偿台区三相电流不平衡发出的功率。
可选的，所述分相功率调节模块包括第一滤波电容、第二滤波电容、三相电抗器和三相全桥逆变器；
所述第一滤波电容和所述第二滤波电容与电网连接在电网的中性线和所述三相全桥逆变器件间，所述三相电抗器连接在所述三相全桥逆变器和电网的三相线间；
其中，所述第一滤波电容、所述第二滤波电容和所述三相电抗器的电感值由容量和滤波效果确定。
可选的，所述分控制器通过无线或载波方式与所述主控制器进行通讯，所述分控制器与所述分相功率调节模块电连接，用于采集对应的分相功率调节模块并网点的各相功率和电压以上传至所述主控制器，并把所述主控制器计算出的控制量下发对应的分相功率调节模块以控制所述分相功率调节模块输出所述主控制器对应的调节功率。
可选的，所述主控制器用于采集台区A相、B相和C相的电压和电流， 根据所述A相、B相和C相的电压和电流计算分相功率调节模块应输出的A相、B相和C相三相功率；
其中，A相、B相和C相功率计算公式如下：
Pa＝ua*ia
Pb＝ub*ib
Pc＝uc*ic
式中，Pa为台区A相功率，Ua台区首端A相电压、ia为台区首端A相电流，Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流,Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流；
节点i后第j个调节电源需要向台区A、B、C三相补充的功率计算公式如下：


式中，n为参与调节的调节电源的数量。
可选的，所述分相功率调节模块在确保各节点之间电压差最小的情况下，所述分相功率调节模块的最优输出值Pxa，Pxb，Pxc，Qxa，Qxb和Qxc是基于PSO优化算法求取的；
其中，所述PSO优化算法对应的不平衡度公式为：
(Pa+Pb+Pc-(Pxa+pxb+pxc))/3＝K1；
(|Pa-Pxa-K1|+|pb-Pxb-K1|+|Pc-Pxc-K1|)/3*K1＝A；
所述PSO优化算法对应的约束条件为：
pxa+Pxb+Pxc＝Ppv
Pxa+pxb+pxc+Qx≤Svsi
A<5％
所述PSO优化算法对应的目标函数为：

式中，△Umj为分布式电源及储能参与不平衡调节后节点m与节点m-1之间的电压差，k为台区接入的调节电源总数，Pi为节点i后台区各节点的功率，r为台区单位长度线路对应的电阻，x台区单位长度线路对应电抗，lm为台区首端至节点i处的线路长度。
可选的，所述分相功率调节模块在确保分布式光伏电源运行在最大发电功率模式的情况下，所述分相功率调节模块的输出的不平衡参考电流Ia_ref、Ib_ref和Ic_ref由下式确定：


式中，为分相功率调节模块需输出的不平衡电流序分量分解计算得到需补偿电流的负序电流和零序电流，Ia *、Ib *、Ic *为分相功率调节模块滤波电容电压控制分量。
可选的，所述分相功率调节模块滤波电容电压控制分量是Ia *、Ib *、Ic *通过下述方法得到的：
获取所述第一滤波电容和第二滤波电容串联后正负极两端电压Udc与Udc_ref的电压差值；
所述电压差值经PI控制器后输出作为dq/abc变换的d轴有功分量；
将dq/abc变换q轴无功分量设置为0；
经dq/abc变换后得到电容电压控制分量Ia *、Ib *、Ic *。
可选的，所述分相功率调节模块输出的不平衡电流由下式确定：
Iaj＝|Paxj|/uaj
Ibj＝|Pbxj|/ubj
Icj＝|Pcxj|/ucj
式中，uaj、ubj、ucj分别为节点j的A、B、C三相电压。
第二方面，本发明还提出一种低压台区分相输出功率调节方法，用于第一方面任一项所述的系统，包括：步骤S110-步骤S170；
S110、检测三相不平衡度；
S120、在所述三相不平衡度没有达到启动值的情况下，计算台区各相需补偿的功率；
S130、确定台区需参与不平衡调节的调节电源，其中，所述调节电源包括台区分布式光伏和分布式小储能电源；
S140、计算各分相功率调节模块需输出的不平衡调节功率，确定分相功率调节模块的三相补偿参考电流Ia_ref、Ib_ref、Ic_ref；
S150、通过分相功率调节模块的变流器滞环控制跟踪电流参考值Ia_ref、Ib_ref、Ic_ref得到相输出模块变流器实际补偿电流Ioa、Iob、Ioc；
S160、检测三相不平衡度变化幅度是否达到设定的偏移值；
S170、如果没有达到所述设定的偏移值重复步骤S120至步骤S160。
第三方面，本发明还提出一种计算机可读存储介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现如第二方面所述的低压台区分相输出功率调节方法。
实施本发明实施例，将具有如下有益效果：
本发明通过控制台区多个分布式调节电源，调节电源包括台区分布式光伏和分布式小储能电源，在保证台区电压偏差最小的条件下，输出不平衡电流，多个分布式电源协同调节，实现台区三相不平衡的精准治理，降低了线路损耗，提高了电能质量。本发明实现了分布式光伏电源最优发电和台区三相不平衡补偿的复用，在台区三相负载平衡时，光伏电源可作为正常电源为负载供电，提 高了系统的经济性。在台区三相不平衡时，可控制多个分布式光伏电源输出三相不平衡补偿功率和发电功率，兼顾了台区三相不平衡治理和光伏发电并网。为分布式电源参与台区功率调控提供了一种创新性的方法，支撑新型电力系统建设。实现了多个分布式光伏分相并网发电治理配电配变三相不平衡。提出了一种多分布式电源协同参与台区调控的模式，为新型电力系统下分布式光伏电源高渗透带来的台区功率扰动，提供了可借鉴的控制技术。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
其中：
图1为本发明实施例提出的一种低压台区分相输出调节系统示意图；
图2为本发明实施例提出的一种分相功率调节模块的结构图；
图3为本发明实施例提出的一种分相功率调节模块不平衡电流输出方法的控制框图；
图4本发明实施例提出的一种后端负载侧三相不平衡电流波形图；
图5本发明实施例提出的一种前端负载侧三相不平衡电流波形图；
图6本发明实施例提出的一种三相全桥逆变器输出电流波形图；
图7本发明实施例提出的一种补偿前输电线路电流波形图；
图8本发明实施例提出的一种补偿后输电线路电流波形图；
图9本发明实施例提出的一种低压台区分相输出功率调节方法流程示意图；
图10为本申请实施例提供的直驱风机低电压穿越控制电子设备结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。
请参阅图1，为本申请实施例提供的低压台区分相输出功率调节系统，包括：
调节电源10，分相功率调节模块20，分控制器30，主控制器40；
所述调节电源10与所述分相功率调节模块20连接，所述调节电源的总功率P满足下式关系：
P＝Pt＝PG1+PG2+...PGn
其中，Pt为满足配电变压器三相电流不平衡调控所需的功率，PG1、PG2…PGn为台区内的每个所述调节电源10为补偿台区三相电流不平衡发出的功率；
所述分相功率调节模块20与台区A、B、C三相线路及中性线N连接；
所述分控制器30与所述调节电源连接10，所述分控制器30与所述主控制器10进行通讯以控制所述调节电源10为补偿台区三相电流不平衡发出的功 率。
具体的，如图1所示，主控制器40控制多个分相功率调节模块20以控制每个调节电源10输入台区电网的功率，所述调节电源10包括台区分布式光伏、分布式小水电、柴油发电机、分布式储能等电源，Pt为满足配电变压器三相电流不平衡调控所需的功率，调节电源通过向台区发出能量以补偿台区三相电流不平衡，调节电源在补偿台区三相电流不平衡时，可以是部分节点的调节电源向台区发出能量，也可以是全部节点的调节电源向台区发出能量。所述分控制器30通过电线连接在所述调节电源连接10和台区电网之间。主控制器10根据分相功率调节模块20获取在其接入测量到的电压和功率，并将上述电压和功率传输给主控制器10，主控制器10通过计算，将控制量下发给对应的分相功率调节模块20从而控制相输出模块输出所述主控制器对应的调节功率。
在一些实施方式中，所述分相功率调节模块包括第一滤波电容21、第二滤波电容22、三相电抗器23和三相全桥逆变器24；
所述第一滤波电容21和所述第二滤波电容22与电网连接在电网的中性线n和所述三相全桥逆变器件24间，所述三相电抗器23连接在所述三相全桥逆变器24和电网的三相线A、B、C间；
其中，所述第一滤波电容21、所述第二滤波电容22和所述三相电抗器23的电感值由容量和滤波效果确定。
在一些实施方式中，所述分控制器30通过无线或载波方式与所述主控制器40进行通讯，所述分控制器30与所述分相功率调节模块20电连接，用于采集对应的分相功率调节模块20并网点的各相功率和电压以上传至所述主控制器40，并把所述主控制器40计算出的控制量下发对应的分相功率调节模块20以控制所述分相功率调节模块20输出所述主控制器对应的调节功率。
在一些实施方式中，所述主控制器40用于采集台区A相、B相和C相的电压和电流，根据所述A相、B相和C相的电压和电流计算分相功率调节模块应输出的A相、B相和C相三相功率；
其中，A相、B相和C相功率计算公式如下：
Pa＝ua*ia
Pb＝ub*ib
Pc＝uc*ic
式中，Pa为台区A相功率，Ua台区首端A相电压、ia为台区首端A相电流，Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流,Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流；
节点i后第j个调节电源需要向台区A、B、C三相补充的功率计算公式如下：


式中，n为参与调节的调节电源的数量。
在一些实施方式中，所述分相功率调节模块在确保各节点之间电压差最小的情况下，所述分相功率调节模块的最优输出值Pxa，Pxb，Pxc，Qxa，Qxb和Qxc是基于PSO优化算法求取的；
其中，所述PSO优化算法对应的不平衡度公式为：
(Pa+Pb+Pc-(Pxa+pxb+pxc))/3＝K1；
(|Pa-Pxa-K1|+|pb-Pxb-K1|+|Pc-Pxc-K1|)/3*K1＝A；
所述PSO优化算法对应的约束条件为：
pxa+Pxb+Pxc＝Ppv
Pxa+pxb+pxc+Qx≤Svsi
A<5％
所述PSO优化算法对应的目标函数为：

式中，△Umj为分布式电源及储能参与不平衡调节后节点m与节点m-1之间的电压差，k为台区接入的调节电源总数，Pi为节点i后台区各节点的功率，r为台区单位长度线路对应的电阻，x台区单位长度线路对应电抗，lm为台区首端至节点i处的线路长度。
在一些实施方式中，所述分相功率调节模块20在确保分布式光伏电源运行在最大发电功率模式的情况下，所述分相功率调节模块20的输出的不平衡参考电流Ia_ref、Ib_ref和Ic_ref由下式确定：


式中，为分相功率调节模块20需输出的不平衡电流序分量分解计算得到需补偿电流的负序电流和零序电流，Ia *、Ib *、Ic *为分相功率调节模块滤波电容电压控制分量。
在一些实施方式中，所述分相功率调节模块20滤波电容电压控制分量是Ia *、Ib *、Ic *通过下述方法得到的：
获取所述第一滤波电容和第二滤波电容串联后正负极两端电压Udc与Udc_ref的电压差值；
所述电压差值经PI控制器后输出作为dq/abc变换的d轴有功分量；
将dq/abc变换q轴无功分量设置为0；
经dq/abc变换后得到电容电压控制分量Ia *、Ib *、Ic *。
具体的，如图3所示，为本发明实施例提出的一种分相功率调节模块20不平衡电流输出方法的控制框图，首先第一滤波电容的电压Udc和第二滤波电容的电压Udc_ref求差，然后差值经PI控制器后输出作为dq/abc变换的d轴有 功分量Id；将dq/abc变换q轴无功分量Iq设置为0，将有功分Id和无功分量Iq经dq/abc变换后得到电容电压控制分量Ia*、Ib*、Ic*。
在一些实施方式中，所述分相功率调节模块20输出的不平衡电流由下式确定：
Iaj＝|Paxj|/uaj
Ibj＝|Pbxj|/ubj
Icj＝|Pcxj|/ucj
式中，uaj、ubj、ucj分别为节点j的A、B、C三相电压。
综上，本发明通过控制台区多个分布式电源，在保证台区电压偏差最小的条件下，输出不平衡电流，多个分布式电源协同调节，实现台区三相不平衡的精准治理，降低了线路损耗，提高了电能质量。本发明实现了分布式光伏电源最优发电和台区三相不平衡补偿的复用，在台区三相负载平衡时，光伏电源可作为正常电源为负载供电，提高了系统的经济性。在台区三相不平衡时，可控制多个分布式光伏电源输出三相不平衡补偿功率和发电功率，兼顾了台区三相不平衡治理和光伏发电并网。为分布式电源参与台区功率调控提供了一种创新性的方法，支撑新型电力系统建设。实现了多个分布式光伏分相并网发电治理配电配变三相不平衡。提出了一种多分布式电源协同参与台区调控的模式，为新型电力系统下分布式光伏电源高渗透带来的台区功率扰动，提供了可借鉴的控制技术。
请参阅图4至图9，图4为后端负载侧三相不平衡电流波形图。其波形表明后端负载侧三相电流处于不平衡状态。图5为前端负载侧三相不平衡电流波形图。其波形表明前端负载侧三相电流处于不平衡状态。图6为三相全桥逆变器输出电流波形图。其波形为采用本发明所提控制方法三相全桥逆变器输出的补偿电流。图7为补偿前输电线路电流波形图。由图可知，输电线路的三相电流处于不平衡状态，电流不平衡度为37.2％。图8为补偿后输电线路电流波形图。由图可知，输电线路的三相电流处于平衡状态，电流不平衡度为1.8％。 由电流波形图可见采用了本发明提出的低压台区分相调节系统后，电流的不平衡度显著降低，为新型电力系统下分布式光伏电源高渗透带来的台区功率扰动，提供了可借鉴的控制技术。
如图9所示本申请还提出一种分布式储能联合的功率调节方法，用于第一方面项所述的系统，其特征在于，包括：
S110、检测三相不平衡度；
S120、在所述三相不平衡度没有达到启动值的情况下，计算台区各相需补偿的功率；
S130、确定台区需参与不平衡调节的分布式光伏；
S140、计算各分相功率调节模块需输出的不平衡调节功率，确定分相功率调节模块的三相补偿参考电流Ia_ref、Ib_ref、Ic_ref；
S150、通过分相功率调节模块的变流器滞环控制，跟踪电流参考值Ia_ref、Ib_ref、Ic_ref，得到相输出模块变流器实际补偿电流Ioa、Iob、Ioc；
S160、检测三相不平衡度变化幅度是否达到设定的偏移值；
S170、如果没有达到所述设定的偏移值重复步骤S120至步骤S160。
如图10所示，本申请实施例还提供一种电子设备300，包括存储器310、处理器320及存储在存储器320上并可在处理器上运行的计算机程序311，处理器320执行计算机程序311时实现上述槽式太阳能集热场出口温度控制的任一方法的步骤。
由于本实施例所介绍的电子设备为实施本申请实施例中一种槽式太阳能集热场出口温度控制装置所采用的设备，故而基于本申请实施例中所介绍的方法，本领域所属技术人员能够了解本实施例的电子设备的具体实施方式以及其各种变化形式，所以在此对于该电子设备如何实现本申请实施例中的方法不再详细介绍，只要本领域所属技术人员实施本申请实施例中的方法所采用的设备，都属于本申请所欲保护的范围。
在具体实施过程中，该计算机程序311被处理器执行时可以实现图9对应 的实施例中任一实施方式。
需要说明的是，在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详细描述的部分，可以参见其它实施例的相关描述。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式计算机或者其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
本申请实施例还提供了一种计算机程序产品，该计算机程序产品包括计算机软件指令，当计算机软件指令在处理设备上运行时，使得处理设备执行如图1对应实施例中的直驱风机低电压穿越控制方法的流程。
计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。

Claims (10)

  1. 一种低压台区分相输出功率调节系统，其特征在于，包括：调节电源，分相功率调节模块，分控制器，主控制器；
    所述调节电源与所述分相功率调节模块连接，所述调节电源的总功率P满足下式关系：
    P＝Pt＝PG1+PG2+…PGn
    其中，Pt为满足配电变压器三相电流不平衡调控所需的功率，PG1、PG2…PGn为每个所述调节电源为补偿台区三相电流不平衡发出的功率；
    所述分相功率调节模块与台区A、B、C三相线路及中性线N连接；
    所述分控制器与所述调节电源连接，所述分控制器与所述主控制器进行通讯以控制每个所述调节电源为补偿台区三相电流不平衡发出的功率。
  2. 如权利要求1所述的系统，其特征在于，所述分相功率调节模块包括第一滤波电容、第二滤波电容、三相电抗器和三相全桥逆变器；
    所述第一滤波电容和所述第二滤波电容与电网连接在电网的中性线和所述三相全桥逆变器件间，所述三相电抗器连接在所述三相全桥逆变器和电网的三相线间；
    其中，所述第一滤波电容、所述第二滤波电容和所述三相电抗器的电感值由容量和滤波效果确定。
  3. 如权利要求1所述的系统，其特征在于，所述分控制器通过无线或载波方式与所述主控制器进行通讯，所述分控制器与所述分相功率调节模块电连接，用于采集对应的分相功率调节模块并网点的各相功率和电压以上传至所述主控制器，并把所述主控制器计算出的控制量下发对应的分相功率调节模块以控制所述分相功率调节模块输出所述主控制器对应的调节功率。
  4. 如权利要求1所述的系统，其特征在于，所述主控制器用于采集台区A相、B相和C相的电压和电流，根据所述A相、B相和C相的电压和电流计算分相功率调节模块应输出的A相、B相和C相三相功率；
    其中，A相、B相和C相功率计算公式如下：
    Pa＝ua*ia
    Pb＝ub*ib
    Pc＝uc*ic
    式中，Pa为台区A相功率，Ua台区首端A相电压、ia为台区首端A相电流，Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流,Pb为台区B相功率，Ub台区首端B相电压、ib为台区首端B相电流；
    节点i后第j个调节电源需要向台区A、B、C三相补充的功率计算公式如下：


    式中，n为参与调节的调节电源的数量。
  5. 如权利要求1所述的系统，其特征在于，所述分相功率调节模块在确保各节点之间电压差最小的情况下，所述分相功率调节模块的最优输出值Pxa，Pxb，Pxc，Qxa，Qxb和Qxc是基于PSO优化算法求取的；
    其中，所述PSO优化算法对应的不平衡度公式为：
    (Pa+Pb+Pc-(Pxa+pxb+pxc))/3＝K1；
    (|Pa-Pxa-K1|+|pb-Pxb-K1|+|Pc-Pxc-K1|)/3*K1＝A；
    所述PSO优化算法对应的约束条件为：
    pxa+Pxb+Pxc＝Ppv
    Pxa+pxb+pxc+Qx≤Svsi
    A<5％
    所述PSO优化算法对应的目标函数为：

    式中，△Umj为分布式电源及储能参与不平衡调节后节点m与节点m-1之间的电压差，k为台区接入的调节电源总数，Pi为节点i后台区各节点的功率，r为台区单位长度线路对应的电阻，x台区单位长度线路对应电抗，lm为台区首端至节点i处的线路长度。
  6. 如权利要求3所述的系统，其特征在于，所述分相功率调节模块在确保分布式光伏电源运行在最大发电功率模式的情况下，所述分相功率调节模块的输出的不平衡参考电流Ia_ref、Ib_ref和Ic_ref由下式确定：


    式中，为分相功率调节模块需输出的不平衡电流序分量分解计算得到需补偿电流的负序电流和零序电流，Ia *、Ib *、Ic *为分相功率调节模块滤波电容电压控制分量。
  7. 如权利要求6所述的系统，其特征在于，所述分相功率调节模块滤波电容电压控制分量是Ia *、Ib *、Ic *通过下述方法得到的：
    获取所述第一滤波电容和第二滤波电容串联后正负极两端电压Udc与Udc_ref的电压差值；
    所述电压差值经PI控制器后输出作为dq/abc变换的d轴有功分量；
    将dq/abc变换q轴无功分量设置为0；
    经dq/abc变换后得到电容电压控制分量Ia *、Ib *、Ic *。
  8. 如权利要求6所述的系统，其特征在于，所述分相功率调节模块输出的不平衡电流由下式确定：
    Iaj＝|Paxj|/uaj
    Ibj＝|Pbxj|/ubj
    Icj＝|Pcxj|/ucj
    式中，uaj、ubj、ucj分别为节点j的A、B、C三相电压。
  9. 一种低压台区分相输出功率调节方法，用于权利要求1所述的系统，其特征在于，包括：
    S110、检测三相不平衡度；
    S120、在所述三相不平衡度没有达到启动值的情况下，计算台区各相需补偿的功率；
    S130、确定台区需参与不平衡调节的调节电源，其中，所述调节电源包括台区分布式光伏和分布式小储能电源；
    S140、计算各分相功率调节模块需输出的不平衡调节功率，确定分相功率调节模块的三相补偿参考电流Ia_ref、Ib_ref、Ic_ref；
    S150、通过分相功率调节模块的变流器滞环控制跟踪电流参考值Ia_ref、Ib_ref、Ic_ref得到相输出模块变流器实际补偿电流Ioa、Iob、Ioc；
    S160、检测三相不平衡度变化幅度是否达到设定的偏移值；
    S170、如果没有达到所述设定的偏移值重复步骤S120至步骤S160。
  10. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于：所述计算机程序被处理器执行时实现如权利要求9所述的低压台区分相输出功率调节方法。
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