WO2015074304A1 - 一种基于可控换相电感的换相装置及其实现方法 - Google Patents

一种基于可控换相电感的换相装置及其实现方法 Download PDF

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Publication number
WO2015074304A1
WO2015074304A1 PCT/CN2013/089383 CN2013089383W WO2015074304A1 WO 2015074304 A1 WO2015074304 A1 WO 2015074304A1 CN 2013089383 W CN2013089383 W CN 2013089383W WO 2015074304 A1 WO2015074304 A1 WO 2015074304A1
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commutation
inductor
converter
controllable
inverter
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PCT/CN2013/089383
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English (en)
French (fr)
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汤广福
许韦华
魏晓光
查鲲鹏
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国家电网公司
国网智能电网研究院
中电普瑞电力工程有限公司
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Priority to EP13897975.2A priority Critical patent/EP3073598B1/en
Publication of WO2015074304A1 publication Critical patent/WO2015074304A1/zh

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365Reducing harmonics or oscillations in HVDC
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • Phase change device based on controllable commutation inductance and implementation method thereof
  • the invention relates to a commutation device of a converter valve and an implementation method thereof, in particular to a commutation device based on controllable commutation inductance and an implementation method thereof.
  • the object of the present invention is to provide a commutation device based on a controllable commutating inductance
  • another object is to provide an implementation method of a commutation device based on a controllable commutating inductance, which can be controlled
  • the commutated inductive new commutated bridge improves the commutation characteristics of the inverter-side converter valve when the high-voltage direct current transmission LCC-HVDC fails to commutate, and does not make major changes on the thyristor valve, and has fewer components. Realized, with engineering practicality, saving a lot of cost.
  • the invention provides a phase change device based on a controllable commutating inductance, wherein the phase change device adopts a three-phase half bridge structure, and the three-phase half bridge structure is composed of a series of phase change units, and the improvement is that
  • the commutation unit includes a converter transformer and a commutating inverter, and a commutation inductor is connected in series between the valve side of the converter transformer and the converter inverter;
  • the controllable inductance in the commutating inductor is used in conjunction with the control protection system in the converter station.
  • the switch When the converter station is in normal operation, the switch is turned off, and the controllable inductor is included in the commutation inductor; when in the converter station
  • the switch When the control protection system detects the failure of the commutation, the switch is closed, which is used to improve the commutation characteristics of the converter valve in the converter station, and can reduce the leakage inductance inductance value, reduce the commutation angle and increase the cut-off angle.
  • the commutation device includes a smoothing reactor; the smoothing reactor is connected to an input end of the commutation inverter, and the commutation unit includes a converter transformer, a commutating inductor, and a commutation inverter After connecting in turn Connect to the AC bus.
  • the converter inverter is a 12-pulse inverter, which is composed of two 6-pulse converters in series, and each of the six-pulse converters constitutes a full-bridge rectifier circuit with six thyristor bridge arms; one of them
  • the 6-pulse converter is connected to the AC bus through two star transformers; the other 6-pulse converter is connected to the AC bus through the delta and star transformers.
  • the commutating inductors are three-phase structures respectively corresponding to three phases connected to the converter transformer, and the controllable inductors are composed of parallel inductors and switches; the switches fail according to normal operation of the converter station and commutation Disconnect and close.
  • the converter transformer adopts a single-phase transformer including a primary coil, a secondary coil and a core; the core is replaced by a core; the single-phase transformer adopts two star-connected transformers or a triangular-star connection transformer.
  • the present invention is based on another object, and provides an implementation method of a commutating device based on a controllable commutating inductance, which is improved in that the implementation method includes the following steps:
  • the commutation device provided by the invention adopts a novel commutated bridge with controllable commutation inductance to improve the commutation characteristics of the conventional LCC-HVDC, and does not make major changes in the original thyristor valve and the main circuit, and has few components and is easy to implement. Engineering practicality, saving a lot of cost.
  • the switch in the commutating inductor is used in conjunction with the control and protection system in the converter station. When the switch is in normal operation, the switch S is disconnected.
  • the controllable inductor is used as part of the commutation inductance.
  • the switch S is closed. This mode is flexible and does not have a long-term additional impact on the DC system.
  • DRAWINGS 1 is a schematic diagram of a commutating device based on a controllable commutating inductor provided by the present invention; wherein: 1-flat-wave reactor; 2- 12-pulse inverter; 3-controllable inductor; 4-converter transformer; 5-AC busbar;
  • FIG. 2 is a diagram showing the internal wiring of the controllable inductor provided by the present invention.
  • FIG. 3 is a diagram showing the improved commutation effect of the controllable inductor provided by the present invention.
  • Fig. 4 is a schematic structural view of a 12-pulse inverter provided by the present invention. detailed description
  • the invention adopts the controllable commutation inductive phase change device to improve the commutation characteristics of the inverter side converter valve when the commutation failure occurs, and the controllable inductance is electrically connected in series between the valve side of the converter transformer and the converter valve, the principle thereof
  • the phase change device adopts a three-phase half bridge structure, and the three-phase half bridge structure is composed of a series of phase change units, and the phase change unit includes a converter transformer and a commutation inverter.
  • a commutation inductance is connected in series between the valve side of the converter transformer and the converter inverter.
  • the commutation device includes a smoothing reactor; the smoothing reactor is connected to an input end of the commutation inverter, and the commutation unit includes a converter transformer, a commutation inductor, and a commutation inverter are sequentially connected and connected AC bus.
  • the commutating inverter is a 12-pulse inverter, which is composed of two conventional 6-pulse converters in series. Each of the six-pulse converters is composed of six thyristor bridge arms to form a full-bridge rectifier circuit; one of the six-pulse The converter is connected to the AC bus through two star transformers; the other 6-pulse converter is connected to the AC bus through a delta and star transformer. Its structure is shown in Figure 4.
  • the commutating inductance is a three-phase structure corresponding to the three phases connected to the converter transformer, and the controllable inductor is composed of a parallel inductor and a switch; the switch is opened and closed according to the normal operation of the converter station and the commutation failure.
  • the internal wiring of the controllable inductor is shown in Figure 2.
  • the controllable inductor must be used in conjunction with the control and protection system in the converter station.
  • the switch S is disconnected during normal operation, and the controllable inductor is used as part of the commutation inductance.
  • the switch S is closed. This process serves to reduce the commutation inductance, reduce the commutation angle, and increase the turn-off angle, thereby improving the commutation characteristics. The effect is as shown in FIG.
  • the controllable inductive new commutation bridge improves the degree of commutation. It is determined by the value of the controllable inductance and the leakage inductance of the converter transformer. According to the engineering practice, it can be designed according to the ability of the thyristor valve and the converter transformer to withstand the short-circuit current. Controllable inductance and leakage inductance of the converter transformer.
  • the invention also provides an implementation method of a commutation device based on a controllable commutating inductance, comprising the following steps:
  • the invention adopts a novel commutating bridge with controllable commutation inductance, and electrically controllable inductance is connected in series between the valve side of the converter transformer and the converter valve to improve the commutation characteristics of the inverter side converter valve when the commutation failure occurs. It does not make major changes in the original thyristor valve and the main circuit. It has few components and is easy to implement, and has engineering practicability. It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limited thereto. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be The invention is to be construed as being limited to the scope of the appended claims.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

一种基于可控换相电感(3)的换相装置及其实现方法。换相装置采用三相半桥结构,三相半桥结构由串联的换相单元组成,换相单元包括换流变压器和换流逆变器(2),在换流变压器阀侧和换流逆变器之间串联有换相电感;换相电感中的可控电感与换流站内的控制保护***配合使用,当换流站正常运行时,开关断开,可控电感包含在换相电感内;当换流站内的控制保护***检测到换相失败时,开关闭合,从而实现降低换相电感漏感值、减小换相角和增大关断角。该换相装置改善了换相失败时逆变侧换流阀的换相特性,且具有元件少、实现简单、成本小的优点。

Description

一种基于可控换相电感的换相装置及其实现方法
技术领域
本发明涉及换流阀的换相装置及其实现方法,具体涉及一种基于可控换相电 感的换相装置及其实现方法。 背景技术
换相失败是逆变器常见故障,在工程实际应用中亟需采取相应改善措施。若 使用目前的强迫换相技术将在晶闸管阀上串、 并联辅助充放电回路和辅助桥臂, 会较大程度改变换流阀结构,使得换流器结构复杂, 造成成本的增加和技术上的 难题。 发明内容
针对现有技术的不足,本发明的目的是提供一种基于可控换相电感的换相装 置, 另一目的是提供一种基于可控换相电感的换相装置的实现方法, 利用可控换 相电感式新型换相桥路改善了大型风电场高压直流输电 LCC-HVDC发生换相失 败时逆变侧换流阀的换相特性, 并且不在晶闸管阀上做出重大改动、元件少、 易 实现, 具备工程实用性, 节省大量成本。
本发明的目的是采用下述技术方案实现的:
本发明提供一种基于可控换相电感的换相装置,所述换相装置采用三相半桥 结构, 所述三相半桥结构由串联的换相单元组成, 其改进之处在于, 所述换相单 元包括换流变压器和换流逆变器,在所述换流变压器阀侧和换流逆变器之间串联 有换相电感;
所述换相电感中的可控电感与换流站内的控制保护***配合使用,当换流站 正常运行时, 开关断开, 所述可控电感包含在换相电感内; 当换流站内的控制保 护***检测到换相失败时, 开关闭合, 用于改善换流站内换流阀的换相特性, 能 够实现降低换相电感漏感值、 减小换相角和增大关断角。
进一步地,所述换相装置包括平波电抗器; 所述平波电抗器连接在换流逆变 器的输入端,所述换相单元包括换流变压器、换相电感和换流逆变器依次连接后 接入交流母线。
进一步地, 所述换流逆变器为 12脉动逆变器, 由 2个 6脉动换流器串联组 成,每个 6脉动换流器以 6个晶闸管桥臂组成全桥整流式电路; 其中一个 6脉动 换流器通过两个星型变压器接入交流母线;另一个 6脉动换流器通过三角型和星 型变压器接入交流母线。
进一步地, 所述换相电感为三相结构, 分别对应连接在换流变压器的三相, 所述可控电感由并联的电感和开关组成;所述开关根据换流站正常运行和换相失 败进行断开和闭合。
进一步地, 所述换流变压器采用单相变压器, 包括初级线圈、 次级线圈和铁 心; 所述磁芯替换为铁心; 单相变压器采用两个星型连接的变压器或三角型-星 型连接的变压器。
本发明基于另一目的提供的一种基于可控换相电感的换相装置的实现方法, 其改进之处在于, 所述实现方法包括下述步骤:
( 1 )通过控制保护***预测逆变器在换相后的阻断状态, 判断是否发生换 相失败;
(2) 若发生换相失败则闭合开关 S, 使得换相电感的漏感减小, 增大关断 角。 与现有技术比, 本发明达到的有益效果是:
1、 本发明提供的换相装置采用可控换相电感式新型换相桥路改善传统 LCC-HVDC 换相特性, 不在原有晶闸管阀和主回路中作重大改动, 元件少、 易 实现, 具备工程实用性, 节省大量成本。
2、 换相电感中的开关与换流站内控制保护***配合使用, 正常运行时开关 S断开, 可控电感作为换相电感的一部分, 当换流站内控制保护***监测到换相 失败时, 开关 S闭合。 该方式控制灵活, 不对直流***造成长期的附加影响。
3、 可控电感的设计值可根据晶间管换流阀及换流变压器耐受短路电流的能 力设计确定,可根据各个 LCC-HVDC工程的具体情况,灵活设计可控电感参数。 附图说明 图 1是本发明提供的基于可控换相电感的换相装置的原理图; 其中: 1-平波 电抗器; 2- 12脉动逆变器; 3-可控电感; 4-换流变压器; 5-交流母线;
图 2是本发明提供的可控电感内部接线图;
图 3是本发明提供的可控电感改善换相效果图;
图 4是本发明提供的 12脉动逆变器的结构示意图。 具体实施方式
下面结合附图对本发明的具体实施方式作进一步的详细说明。
本发明采用可控换相电感式换相装置改善了换相失败发生时逆变侧换流阀 的换相特性,在换流变压器阀侧及换流阀中间电串联了可控电感, 其原理图如图 1所示, 所述换相装置采用三相半桥结构, 所述三相半桥结构由串联的换相单元 组成,所述换相单元包括换流变压器和换流逆变器, 在所述换流变压器阀侧和换 流逆变器之间串联有换相电感。换相装置包括平波电抗器; 所述平波电抗器连接 在换流逆变器的输入端,所述换相单元包括换流变压器、换相电感和换流逆变器 依次连接后接入交流母线。
换流逆变器为 12脉动逆变器, 由 2个传统 6脉动换流器串联而成, 每个 6 脉动换流器以 6个晶闸管桥臂组成全桥整流式电路,; 其中一个 6脉动换流器通 过两个星型变压器接入交流母线;另一个 6脉动换流器通过三角型和星型变压器 接入交流母线。 其结构图如图 4所示。
换相电感为三相结构, 分别对应连接在换流变压器的三相, 可控电感由并联 的电感和开关组成; 所述开关根据换流站正常运行和换相失败进行断开和闭合。 可控电感内部接线如图 2所示。
可控电感须与换流站内控制保护***配合使用, 正常运行时开关 S断开,可 控电感作为换相电感的一部分, 当换流站内控制保护***监测到换相失败时, 开 关 S闭合, 此过程起到降低换相电感、 减小换相角、增大关断角, 从而改善换相 特性的作用, 效果如附图 3所示。
可控电感式新型换相桥路改善换相的程度,由可控电感与换流变压器的漏感 的取值确定, 可根据工程实际, 按照晶闸管阀及换流变压器耐受短路电流能力合 适设计可控电感与换流变压器漏感。 本发明还提供一种基于可控换相电感的换相装置的实现方法, 包括下述步 骤:
( 1 ) 通过控制保护***预测逆变器在换相后的阻断状态, 判断是否发生换 相失败;
(2) 若发生换相失败则闭合开关 S, 使得换相电感的漏感减小, 增大关断 角。
本发明采用可控换相电感式新型换相桥路,在换流变压器阀侧及换流阀中间 电串联了可控电感改善了换相失败发生时逆变侧换流阀的换相特性,不在原有晶 闸管阀和主回路中作重大改动, 元件少、 易实现, 具备工程实用性。 最后应当说明的是: 以上实施例仅用以说明本发明的技术方案而非对其限制, 尽 管参照上述实施例对本发明进行了详细的说明,所属领域的普通技术人员应当理 解: 依然可以对本发明的具体实施方式进行修改或者等同替换, 而未脱离本发明 精神和范围的任何修改或者等同替换, 其均应涵盖在本发明的权利要求范围当 中。

Claims

权 利 要 求
1、 一种基于可控换相电感的换相装置, 所述换相装置采用三相半桥结构, 所述三相半桥结构由串联的换相单元组成,其特征在于, 所述换相单元包括换流 变压器和换流逆变器, 在所述换流变压器阀侧和换流逆变器之间串联有换相电 感;
所述换相电感中的可控电感与换流站内的控制保护***配合使用,当换流站 正常运行时, 开关断开, 所述可控电感包含在换相电感内; 当换流站内的控制保 护***检测到换相失败时, 开关闭合, 用于改善换流站内换流阀的换相特性, 能 够实现降低换相电感漏感值、 减小换相角和增大关断角。
2、 如权利要求 1所述的换相装置, 其特征在于, 所述换相装置包括平波电 抗器; 所述平波电抗器连接在换流逆变器的输入端, 所述换相单元包括换流变压 器、 换相电感和换流逆变器依次连接后接入交流母线。
3、 如权利要求 1-2中任一项所述的换相装置, 其特征在于, 所述换流逆变 器为 12脉动逆变器, 由 2个 6脉动换流器串联组成, 每个 6脉动换流器以 6个 晶闸管桥臂组成全桥整流式电路;其中一个 6脉动换流器通过两个星型变压器接 入交流母线; 另一个 6脉动换流器通过三角型和星型变压器接入交流母线。
4、 如权利要求 1-2中任一项所述的换相装置, 其特征在于, 所述换相电感 为三相结构, 分别对应连接在换流变压器的三相, 所述可控电感由并联的电感和 开关组成; 所述开关根据换流站正常运行和换相失败进行断开和闭合。
5、 如权利要求 1所述的换相装置, 其特征在于, 所述换流变压器采用单相 变压器, 包括初级线圈、 次级线圈和铁心; 所述磁芯替换为铁心; 单相变压器采 用两个星型连接的变压器或三角型-星型连接的变压器。
6、 一种基于可控换相电感的换相装置的实现方法, 其特征在于, 所述实现 方法包括下述步骤:
( 1 ) 通过控制保护***预测逆变器在换相后的阻断状态, 判断是否发生换 相失败;
( 2 ) 若发生换相失败则闭合开关 S, 使得换相电感的漏感减小, 增大关断 角。
PCT/CN2013/089383 2013-11-19 2013-12-13 一种基于可控换相电感的换相装置及其实现方法 WO2015074304A1 (zh)

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