WO2023221203A1 - Procédé de commande de sortie de déséquilibre triphasé et système associé - Google Patents

Procédé de commande de sortie de déséquilibre triphasé et système associé Download PDF

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Publication number
WO2023221203A1
WO2023221203A1 PCT/CN2022/097822 CN2022097822W WO2023221203A1 WO 2023221203 A1 WO2023221203 A1 WO 2023221203A1 CN 2022097822 W CN2022097822 W CN 2022097822W WO 2023221203 A1 WO2023221203 A1 WO 2023221203A1
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WO
WIPO (PCT)
Prior art keywords
phase
output
grid
export
peak
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PCT/CN2022/097822
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English (en)
Chinese (zh)
Inventor
刘超厚
安天宏
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浙江艾罗网络能源技术股份有限公司
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Publication of WO2023221203A1 publication Critical patent/WO2023221203A1/fr

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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
    • 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 an output control method, in particular to a three-phase unbalanced output control method and its system.
  • the existing three-phase photovoltaic grid-connected power generation systems are three-phase balanced output systems, which can achieve zero grid-connected power control of the sum of the three-phase grid-connected power.
  • each phase cannot be achieved.
  • zero grid-connected power control of the grid-connected port power there will be situations where some phases have grid-fed power and some phases need to draw power from the mains. Therefore, the current three-phase grid-connected power generation system cannot simultaneously meet the requirements of being friendly to the traditional power grid system, realizing self-use and improving photovoltaic energy utilization.
  • the object of the present invention is to provide a three-phase unbalanced output control method and its system.
  • the invention can simultaneously meet the requirements of being friendly to the traditional power grid system, realizing spontaneous self-use and improving photovoltaic energy utilization.
  • the three-phase grid-connected port powers P export_R , P export_S , and P export_T are obtained respectively;
  • the three-phase photovoltaic grid-connected inverter is obtained The output power limit PacLimit ;
  • the difference between the bus voltage control loop reference value Bus Ac_ref and the bus voltage value U bus is used as an error signal to output the AC current peak reference value I peak through the PI controller;
  • the calculation formula of the three-phase output power and the three-phase grid-connected port power is: Among them, T represents the mains cycle time, u(t) represents the instantaneous value of the mains voltage, and i(t) represents the instantaneous value of the current.
  • the output power limit value PacLimit P ac +K ⁇ (3 ⁇ P exprotLimit -P export ), where K is an internal control parameter.
  • step S4 is specifically: compare the sizes of PacLimit and Pac . If PacLimit ⁇ P ac , the power limit flag is set. If PacLimit >(P ac + hysteresis return threshold), the power limit flag is cleared; if the power limit flag is set, the power limit control loop is executed, and the voltage output value of the power limit control loop is used as the voltage target value output by the photovoltaic module; if the power limit flag is If the bit is not set, the maximum power tracking algorithm is used to obtain the voltage target value output by the photovoltaic module.
  • the power limit control loop uses PacLimit as the reference value, Pac as the feedback value, and outputs the voltage target value U pvref of the photovoltaic module through the PI controller.
  • a system for realizing the above-mentioned three-phase unbalanced output control method including a plurality of photovoltaic components, the output side of each photovoltaic component is connected to a DC/DC converter, and the output end of each DC/DC converter is
  • the DC bus is connected to the input end of the DC/AC converter, the output end of the DC/AC converter is connected to the three-phase line ends of the three-phase mains through three-phase relays, and the midpoint of the DC bus is connected to the three-phase line through the neutral relay.
  • the neutral terminal of the mains is connected.
  • the three-phase relay and the DC/AC converter are each connected in series with an output current sensor for measuring the output current of the three-phase photovoltaic grid-connected inverter; the three-phase relay and the three-phase mains are connected in series.
  • the corresponding grid-connected port current sensor for measuring the three-phase grid-connected port current is connected in series.
  • the user-side three-phase load and Voltage sensor for measuring three-phase mains voltage.
  • the present invention realizes unbalanced output of three-phase power, thereby reducing the impact of the photovoltaic system on the traditional power grid system, and achieving control of the optimal output power of the photovoltaic module, thereby improving
  • the utilization rate of photovoltaic energy can not only meet the requirements of users for self-use, but also enable users to minimize the use of electricity from the grid system and reduce electricity bills.
  • the present invention also designs a three-phase photovoltaic grid-connected inverter that is compatible with two output modes: three-phase three-wire output and three-phase four-wire output. Users can independently choose three-phase output power balance control or three-phase output power balance control. Balance control, and controls the output mode of the three-phase four-wire system to realize the unbalanced output function of the three-phase four-wire system.
  • Figure 1 is a schematic diagram of the power limit control loop of the sum of three-phase grid-connected port power in the present invention
  • Figure 2 is a schematic diagram of the limit control loop of the power of each phase grid-connected port in the present invention
  • Figure 3 is a schematic diagram of the grid-connected inverter circuit structure of a three-phase unbalanced system.
  • a three-phase unbalanced output control method includes the following steps:
  • the three-phase grid-connected port powers P export_R , P export_S , and P export_T are obtained respectively;
  • T represents the mains cycle time
  • u(t) represents the instantaneous value of the mains voltage
  • i(t) represents the instantaneous value of the current.
  • the three-phase photovoltaic grid-connected inverter is obtained
  • the output power limit PacLimit ; PacLimit Pac +K ⁇ (3 ⁇ P exprotLimit -P export ), where K is an internal control parameter, and K is 0.1 in this embodiment.
  • the power limit control loop is executed, and the voltage output value of the power limit control loop is used as the voltage target value output by the photovoltaic module; if the power limit flag is not set, the maximum power tracking is used
  • the algorithm obtains the voltage corresponding to the maximum power as the voltage target value output by the photovoltaic module. In this way, the sum of the three-phase grid-connected port powers P export is 3 ⁇ P exprotLimit .
  • the power limit control loop uses PacLimit as the reference value and Pac as the feedback value to adjust the output power of the photovoltaic module, and output the voltage target value U pvref of the photovoltaic module through the PI controller, as shown in Figure 1.
  • I peak_ref[R] , I peak_ref[S] , and I peak_ref[T] are different current values, thereby achieving three-phase unbalanced output.
  • P exprotLimit is 0, Then the zero output power of each phase grid-connected port is achieved.
  • a system for implementing the above three-phase unbalanced output control method includes several photovoltaic modules.
  • the output side of each photovoltaic module is connected to a DC/DC converter, and each DC/DC
  • the output terminals of the converter are connected to the input terminal of the DC/AC converter through the DC bus.
  • the output terminals of the DC/AC converter are connected to the R terminal of the three-phase mains through three-phase relays S R , S S , and S T respectively.
  • S line end and T line end are connected correspondingly.
  • the midpoint of the DC bus is connected to the N line end of the three-phase mains through the neutral relay S N.
  • the three-phase relays S R , S S and S T are connected to the DC/AC converter.
  • the user-side three-phase loads Z R , Z S , and Z T and the voltage sensors used to measure the three-phase mains voltages U R , U S , and UT are respectively connected between them, and between the T line and the N line.
  • the three-phase output power can be calculated by the DSP controller through the collected three-phase output current and three-phase grid voltage of the three-phase photovoltaic grid-connected inverter.
  • a three-phase electricity meter can be used to calculate the mains port power of the three-phase photovoltaic grid-connected inverter. Then use the above three-phase power unbalanced output control method to achieve zero output or unbalanced output of grid-connected port power.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)
  • Inverter Devices (AREA)

Abstract

Procédé de commande de sortie de déséquilibre triphasé et système associé. Le procédé consiste à : en utilisant la somme Pac de puissances de sortie de trois phases, la somme Pexport de puissances de ports connectés au réseau des trois phases, et une valeur limite PexprotLimit des puissances de ports connectés au réseau des trois phases, et en réglant les puissances de sortie, permettre à la somme Pexport des puissances de ports connectés au réseau des trois phases d'être 3 × PexprotLimit, et limiter les puissances de ports connectés au réseau de deux des trois phases d'être PexprotLimit, de façon à réaliser une sortie de déséquilibre triphasé. Le système associé comprend plusieurs modules photovoltaïques, un côté sortie de chaque module photovoltaïque étant connecté de manière correspondante à un convertisseur CC/CC et à un convertisseur CC/CA ; et le convertisseur CC/CA est connecté à une borne de ligne triphasée et à une borne de fil neutre d'une alimentation secteur triphasée au moyen de quatre relais.
PCT/CN2022/097822 2022-05-17 2022-06-09 Procédé de commande de sortie de déséquilibre triphasé et système associé WO2023221203A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210540501.3 2022-05-17
CN202210540501.3A CN114844065A (zh) 2022-05-17 2022-05-17 三相不平衡输出控制方法及其系统

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WO2023221203A1 true WO2023221203A1 (fr) 2023-11-23

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CN116260163B (zh) * 2023-02-15 2024-01-23 无锡天青元储智能科技有限公司 一种三相逆变器及输出功率控制方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100052599A1 (en) * 2008-08-26 2010-03-04 Kabushiki Kaisha Toshiba Inverter device
CN101877548A (zh) * 2009-04-28 2010-11-03 新疆新能源股份有限公司 用于光伏并网发电的三相四桥臂逆变器及光伏并网发电系统
CN112909994A (zh) * 2021-01-22 2021-06-04 江苏固德威电源科技股份有限公司 三相逆变器不平衡输入输出控制方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100052599A1 (en) * 2008-08-26 2010-03-04 Kabushiki Kaisha Toshiba Inverter device
CN101877548A (zh) * 2009-04-28 2010-11-03 新疆新能源股份有限公司 用于光伏并网发电的三相四桥臂逆变器及光伏并网发电系统
CN112909994A (zh) * 2021-01-22 2021-06-04 江苏固德威电源科技股份有限公司 三相逆变器不平衡输入输出控制方法

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