WO2019075703A1 - Dispositif de régulation de débit de puissance mixte - Google Patents

Dispositif de régulation de débit de puissance mixte Download PDF

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Publication number
WO2019075703A1
WO2019075703A1 PCT/CN2017/106937 CN2017106937W WO2019075703A1 WO 2019075703 A1 WO2019075703 A1 WO 2019075703A1 CN 2017106937 W CN2017106937 W CN 2017106937W WO 2019075703 A1 WO2019075703 A1 WO 2019075703A1
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WO
WIPO (PCT)
Prior art keywords
switch
unit
control device
flow control
capacitor
Prior art date
Application number
PCT/CN2017/106937
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English (en)
Chinese (zh)
Inventor
赵国亮
邓占锋
陆振纲
宋洁莹
尉志勇
蔡林海
汤广福
戴朝波
于弘洋
刘海军
Original Assignee
全球能源互联网研究院有限公司
国家电网公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 全球能源互联网研究院有限公司, 国家电网公司 filed Critical 全球能源互联网研究院有限公司
Priority to PCT/CN2017/106937 priority Critical patent/WO2019075703A1/fr
Publication of WO2019075703A1 publication Critical patent/WO2019075703A1/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
    • H02J3/04—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

Definitions

  • the present invention relates to the field of power electronics, and in particular to a hybrid power flow control device.
  • the method of line compensation through series capacitors is called fixed series compensation, which has the characteristics of simple control and good economy, but the compensation capacity cannot be flexibly adjusted, and the parameter mismatch may cause system oscillation.
  • the conventional controllable series compensator is composed of a reactor, a capacitor and a half-controlled switching device, and can realize the control of the serial-in capacitive reactance, but has the problems of high insulation requirement, high cost, and slow adjustment speed.
  • the Unified Power Flow Controller (UPFC) and the Static Synchronous Series Compensator (SSSC) are equivalent to a synchronous AC power supply in the line.
  • UPFC Unified Power Flow Controller
  • SSSC Static Synchronous Series Compensator
  • UPFC and SSSC can be equivalent to capacitive and inductive bidirectional variable impedance capable of quickly controlling line power in the line, and have excellent control performance.
  • the present invention provides a hybrid flow control device.
  • An embodiment of the present invention provides a hybrid power flow control device, where the hybrid power flow control device includes a reactor unit, a capacitor unit, an inverter, and a coupling transformer;
  • the reactor unit is connected in series with the first switch and is connected in parallel with the capacitor unit;
  • the reactor unit, the first switch and the inverter are sequentially connected in parallel with a first side winding of the coupling transformer, and a second side winding of the coupling transformer is connected to a power transmission line, the first A second switch is connected in parallel on the two side windings.
  • the reactance can be continuously adjusted by the thyristor bidirectional switch connected in series with the reactor unit, thereby achieving continuous adjustment of the equivalent capacitive reactance, focusing on steady state control; and the inverter Continuous and fast bi-directional adjustment capability is provided, with a focus on dynamic control.
  • the hybrid power flow control device in a second aspect, it can be used in a transmission line or a distribution line to perform capacitive or inductive adjustment, control line current, improve line transmission capacity and system stability level, and reduce The capacity of the voltage source converter reduces the cost of the device.
  • the reactor and the capacitor are connected to the valve side of the coupling transformer to reduce the insulation level of the reactor and the capacitor.
  • FIG. 1 is a schematic structural view of a hybrid power flow control device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of another hybrid type power flow control device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of another hybrid type power flow control device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of another hybrid type power flow control device according to an embodiment of the present invention.
  • 101 reactor unit; 102: capacitor unit; 103: inverter; 104: coupling transformer.
  • the hybrid power flow control device in this embodiment includes:
  • Reactor unit 101 capacitor unit 102, inverter unit 103, and coupling transformer 104. among them,
  • the reactor unit 101 is connected in series with the first switch and in parallel with the capacitor unit 102.
  • the reactor unit 101, the first switch and the inverter unit 103 are sequentially connected in parallel with one side winding of the coupling transformer 104, and the other side winding of the coupling transformer 104 is connected to the power transmission line, and the other side winding is connected in parallel. Two switches.
  • the reactor unit 101 includes one or more reactors connected to each other.
  • the capacitor unit 102 includes one or more interconnected capacitors.
  • the inverter unit 103 includes one or more inverters connected to each other.
  • the one side winding may also be referred to as a first side winding, which may be referred to as a second side winding; wherein the first side winding and the second side winding are located on different sides of the coupling transformer
  • the windings are usually the windings on the opposite side.
  • the first side winding is on the primary side
  • the winding then the second winding is a winding on the secondary side.
  • this is only an example, and the specific implementation is not limited to this.
  • the capacitor unit 102 in the embodiment of the invention comprises a capacitor or a plurality of connected capacitors.
  • each capacitor includes an automatic switching switch for disconnecting when the transmission line needs to be connected to the capacitor, and is closed when the capacitor is not required to be connected.
  • the capacitor unit 102 includes a plurality of capacitors, the capacitors may be connected in series, or may be connected in parallel, or may be a hybrid connection in series and in parallel.
  • the first switch comprises any one of a circuit breaker, an isolating switch and a power electronic switch, and the first switch is used for controlling the input and exit of the reactor unit.
  • the power electronic switch is a thyristor bidirectional switch, which includes an anti-parallel thyristor
  • the equivalent impedance of the reactor unit 101 can be adjusted by changing the firing angle of the thyristor, thereby performing capacitive compensation or inductive compensation on the transmission line.
  • the equivalent reactance of the reactor unit 101 is smaller than the equivalent capacitive reactance of the capacitor unit 102, and the unified power flow controller operates in the capacitive compensation mode to capacitively compensate the transmission line.
  • the equivalent reactance of the reactor unit 101 is greater than the equivalent capacitive reactance of the capacitor unit 102, and the unified power flow controller operates in an inductive compensation mode to inductively compensate the transmission line.
  • the second switch comprises any one of a circuit breaker, an isolating switch and a power electronic switch or two switches in parallel, and the second switch is used for controlling the input and exit of the coupling transformer.
  • the two switches in parallel may be a circuit breaker and an isolating switch in parallel, the circuit breaker is connected in parallel with the power electronic switch, and the isolating switch is connected in parallel with the power electronic switch.
  • the inverter unit 103 includes a two-level inverter, a three-level inverter, a diode clamp type inverter, a flying capacitor type inverter, a modular multi-level converter, and Any one or more of the H-bridge cascaded multilevel converters.
  • the reactor unit 101 includes a reactor L
  • the capacitor unit 102 includes a capacitor C and an inverter.
  • Unit 103 is an inverter VSC and coupling transformer 104 is a coupling transformer Tse.
  • the reactor L is connected in series with the first switch
  • the capacitor C is connected in parallel across the branch composed of the reactor L and the first switch
  • the hybrid branch composed of the reactor L, the first switch and the capacitor C is connected in series with the inverter VSC.
  • Parallel to both ends of one side winding of the coupling transformer Tse, the other side winding of the coupling transformer Tse is connected to the transmission line between the system 1 and the system 2, and a second switch is connected in parallel across the winding.
  • the hybrid power flow control device includes a capacitive compensation mode and an inductive compensation mode to compensate for different impedances:
  • the capacitive reactance of the capacitor unit 102 is set to Xc, and the equivalent impedance range of the inverter unit 103 is [0 to Zinv], and the compensation range of the hybrid power flow control device in the capacitive compensation mode is capacitive reactance.
  • the thyristor firing angle of the first switch can be continuously adjusted, and the impedance of the inverter unit 103 can be adjusted.
  • the inverter unit 103 has a faster response speed, which can be used to enhance system damping and further improve the system. Dynamic response capability. By inputting different capacitor capacities, the capacitive reactance Xc can be obtained, so that the hybrid type flow control device realizes dynamic adjustment while stepwise adjustment, and has a larger dynamic adjustment range.
  • the reactance of the reactor is XL
  • the equivalent impedance range of the inverter unit 103 is [0 to Zinv]
  • the compensation range of the hybrid power flow control device in the inductive compensation mode is the reactance XL and the inverter.
  • the thyristor in the first switch is controlled to be fully turned on, and at the same time, it can be fast.
  • the impedance value of the inverter unit 103 is adjusted in speed to improve the dynamic response capability of the system.
  • FIG. 3 is a schematic structural view of another hybrid power flow control device according to an embodiment of the present invention.
  • the reactor unit, the capacitor unit and the inverter unit are in a parallel connection relationship.
  • the unified power flow controller shown in FIG. 3 introduces a third switch above the power flow controller shown in FIG. 2.
  • the third switch is connected in series with the capacitor unit.
  • the capacitor unit and the third switch are connected in series to form a first branch; the reactor unit and the first switch form a second branch; the first branch and the second branch Parallel connections.
  • FIG. 4 is a schematic structural view of another hybrid power flow control device according to an embodiment of the present invention. As shown in the figure, a reactor unit and a capacitor unit are connected in series to a line, and the inverter unit is connected in series to the line via a coupling transformer.
  • Hybrid power flow control device is not connected to the system
  • the second switch Before the hybrid power flow control device is connected to the system, the second switch is closed, the inverter unit 103 and the thyristor of the first switch are bidirectionally opened and closed, and the hybrid power flow control device is in a bypass state without any influence on the operating state of the system.
  • the hybrid power flow control device determines the impedance value to be compensated according to the upper layer scheduling command and the actual operating condition.
  • the reactance of the long-distance transmission line is large, it is required to operate in the capacitive compensation mode to compensate the reactance of the transmission line and reduce the transmission loss.
  • the transmission line is overloaded due to short-circuit fault or load increase, parallel line trip, etc., it is necessary to operate in the inductive impedance compensation mode to limit the current amplitude.
  • the hybrid power flow control device By adjusting the thyristor firing angle of the thyristor bidirectional switch in the first switch, the hybrid power flow control device operates in a capacitive compensation mode or an inductive compensation mode, and The need for system damping control controls the operation of the inverter unit 103 to improve the dynamic response of the system.
  • the protection measures of the hybrid power flow control device in the event of system failure or device failure mainly include:
  • the second switch needs to be closed to exit the operation of the inverter unit 103.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only, ROM), or a random access memory (RAM).
  • the present invention does not indicate equipment such as lightning arresters, gaps, etc. for protecting capacitors, coupling transformers, inverters and their switching devices, and does not indicate that these devices are not present when the device is designed and manufactured and the engineering is actually implemented.
  • isolation knife gates, circuit breakers, current measuring devices, and voltage measuring devices not shown in the drawings of the present embodiment, and does not indicate that these devices do not exist when the actual implementation of the project.
  • the hybrid power flow control device in the embodiment of the present invention can be used in a transmission line or a distribution line to perform capacitive or inductive adjustment, improve line transmission capacity, improve system stability level, control line current, and enhance system damping, and solve the problem.
  • the existing unified power flow controller or the static synchronous series compensator can not continuously and extensively adjust the problem in a large range, thereby reducing the device cost.
  • FIG. 3 Another embodiment of the present invention is shown in FIG. 3.
  • the reactor unit, the capacitor unit and the inverter unit are connected in parallel and then connected to one side of the coupling transformer.
  • the off thyristor firing angle adjusts the reactance value of the reactor unit.
  • the automatic switching of the capacitor bank can adjust the capacitance of the capacitor, and the inverter unit can dynamically adjust the impedance.
  • the impedance injected into the system side can be controlled by the equivalent impedance adjustment of the reactor unit, the capacitor unit, and the inverter, thereby achieving dynamic adjustment of a wide range of impedances.
  • the reactor unit and the capacitor unit are connected in series to the coupling transformer after being connected in series on the system side, and the inverter unit is connected to the line via the coupling transformer.
  • the reactor unit is also connected in parallel with the first switching device, and the capacitor unit is connected in parallel with the second switching device.
  • the first switching device When the first switching device is turned on and the second switching device is closed, the device operates in an inductive bias state.
  • the first switching device When the first switching device is closed and the second switching device is open, the device operates in a capacitively biased state.
  • the third switching device and the fourth switching device are used to control whether the coupling transformer and the converter valve are put into operation.
  • the reactor device and the capacitor device are fixedly compensated, and the converter valve is dynamically adjusted to achieve dynamic adjustment of a wide range of impedances.
  • the fourth switching device includes: a second switch connected to the winding of the other side of the coupling transformer.
  • both the reactor unit and the capacitor unit are accessed from the mesh side of the coupling transformer.
  • the reactor unit and the capacitor unit are each accessed from a valve side of the coupling transformer.
  • the coupling transformer is divided into a mesh side and a valve side, the mesh side - one side connected to the grid, and the valve side - connected to one side of the converter valve.
  • the reactor unit is on the mesh side, the capacitor unit is on the valve side, or the reactor unit is on the valve side, and the capacitor unit is on the mesh side.
  • an inductive offset configuration is formed to inductively compensate the circuit.
  • a capacitive offset structure is formed to capacitively compensate the circuit.
  • the inductor and the capacitor are connected in series or in parallel with the inverter is not limited to the structure shown in the embodiment, and any case where a large-scale compensation is realized by increasing or decreasing the inductance and the capacitance is within the scope of the present invention. Inside. It is also within the scope of the invention that the inverter can also be connected to other inverters or energy storage devices.

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

Abstract

L'invention concerne un dispositif de régulation de débit de puissance mixte comprenant une unité réacteur (101), une unité condensateur (102), un convertisseur (103) et un transformateur de couplage (104). L'unité réacteur (101) est raccordée en série à un premier commutateur et, lorsqu'elle est connectée, à l'unité de condensateur (102) en parallèle. L'unité réacteur (101), le premier commutateur et le convertisseur (103) sont raccordés séquentiellement et sont ensuite raccordés à un enroulement sur un côté du transformateur de couplage (104) en parallèle, et un enroulement de l'autre côté du transformateur de couplage (104) est raccordé à une ligne de transmission électrique, et un deuxième commutateur est raccordé à l'enroulement de l'autre côté en parallèle.
PCT/CN2017/106937 2017-10-19 2017-10-19 Dispositif de régulation de débit de puissance mixte WO2019075703A1 (fr)

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PCT/CN2017/106937 WO2019075703A1 (fr) 2017-10-19 2017-10-19 Dispositif de régulation de débit de puissance mixte

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114256844A (zh) * 2021-11-10 2022-03-29 国网浙江省电力有限公司电力科学研究院 一种抑制谐波振荡的电容串联式装置及其控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080309158A1 (en) * 2005-12-22 2008-12-18 Siemens Aktiengesellschaft Transmission System for Interchanging Information Data Between an Electrical Load and an Upstream Converter
CN105703376A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种混合型统一潮流控制器
CN105703370A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种串补与换流器结合的统一潮流控制器
CN105703392A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种组合型统一潮流控制器
CN205544326U (zh) * 2016-03-08 2016-08-31 全球能源互联网研究院 组合型统一潮流控制器
CN205544288U (zh) * 2016-03-08 2016-08-31 全球能源互联网研究院 串补与换流器结合的统一潮流控制器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080309158A1 (en) * 2005-12-22 2008-12-18 Siemens Aktiengesellschaft Transmission System for Interchanging Information Data Between an Electrical Load and an Upstream Converter
CN105703376A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种混合型统一潮流控制器
CN105703370A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种串补与换流器结合的统一潮流控制器
CN105703392A (zh) * 2016-03-08 2016-06-22 全球能源互联网研究院 一种组合型统一潮流控制器
CN205544326U (zh) * 2016-03-08 2016-08-31 全球能源互联网研究院 组合型统一潮流控制器
CN205544288U (zh) * 2016-03-08 2016-08-31 全球能源互联网研究院 串补与换流器结合的统一潮流控制器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114256844A (zh) * 2021-11-10 2022-03-29 国网浙江省电力有限公司电力科学研究院 一种抑制谐波振荡的电容串联式装置及其控制方法

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