WO2012010066A1 - Transformerless high voltage direct current transmission topological structure - Google Patents

Transformerless high voltage direct current transmission topological structure Download PDF

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Publication number
WO2012010066A1
WO2012010066A1 PCT/CN2011/077139 CN2011077139W WO2012010066A1 WO 2012010066 A1 WO2012010066 A1 WO 2012010066A1 CN 2011077139 W CN2011077139 W CN 2011077139W WO 2012010066 A1 WO2012010066 A1 WO 2012010066A1
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Prior art keywords
high voltage
circuit
direct current
inverter circuit
power
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PCT/CN2011/077139
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French (fr)
Chinese (zh)
Inventor
赵淑玉
张坤
张跃平
胡涛
李太峰
魏西平
杨洋
王振
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荣信电力电子股份有限公司
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Publication of WO2012010066A1 publication Critical patent/WO2012010066A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

Definitions

  • the invention relates to a high voltage direct current transmission topology, in particular to a transformerless high voltage direct current transmission topology.
  • HVDC transmission technology With the rapid development of power electronics and computer technology, HVDC transmission technology is becoming more and more perfect, and it can compete with UHV communication in transmission capacity and transmission distance. Compared with UHV AC transmission technology, HVDC transmission technology has the following advantages. -
  • the wire used for HVDC transmission is only 2 / 3 ⁇ 1 / 2 of AC transmission;
  • HVDC power transmission the AC systems on both sides do not need to run synchronously, and the high-voltage AC transmission must run synchronously; 5.
  • the loss of HVDC transmission is smaller than that of high-voltage AC transmission.
  • high-voltage direct current transmission the circuit power can be adjusted quickly and conveniently due to the use of the thyristor device.
  • the high-voltage direct current transmission line basically does not supply short-circuit current to the high-voltage AC system where the short circuit occurs, and the short-circuit current of the fault-side AC system is not The same is true when interconnecting.
  • the transformer is an indispensable part of all HVDC transmission equipment, so the transformer cabinet occupies a large proportion of the cost and volume in the entire HVDC transmission equipment, and the larger the capacity of the high-voltage transmission equipment, the transformer The higher the capacity requirements, the higher the cost of HVDC transmission equipment. Summary of the invention
  • the object of the present invention is to provide a transformerless high voltage direct current transmission topology which enables high voltage direct current transmission equipment to realize long distance and large capacity power transmission without a transformer.
  • a transformerless high voltage direct current transmission topology characterized in that it comprises a high voltage charging circuit, an inductor, a rectifying circuit and an inverter circuit, and the high voltage power grid directly enters the high voltage inverter rectifying circuit after passing through a high voltage charging circuit, a coupled or uncoupled inductor,
  • the rectified DC voltage is supplied to the inverter circuit through a long-distance cable to the inverter circuit, and the inverter output is coupled to a coupled or uncoupled inductor.
  • the power unit of the rectifier circuit and the inverter circuit is a half bridge structure composed of two IGBT switching devices.
  • the power unit of the rectifier circuit and the inverter circuit is an H-bridge structure composed of four IGBT switching devices.
  • the rectifier circuit is the same as the power unit used in the inverter circuit and can be replaced by each other.
  • the rectifier circuit and the inverter circuit are three-phase, each phase is formed by connecting even number of n power units in series, and is divided into two groups.
  • the number of power units in each group is n/2, and the input end of each phase of the rectifier circuit is At the midpoint of the two sets of cells, and the input end and each set of cells are connected by a coupled or uncoupled inductor; the output end of each phase of the inverter circuit is at the midpoint of the two sets of cells, and the output end and each set of cells They are also connected by a coupled or uncoupled inductor.
  • the high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, so that the cost is reduced by at least half;
  • the high-voltage DC transmission equipment has no transformer, eliminating the transformer cabinet, reducing the volume by at least half, and reducing the floor space at least by half;
  • the high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, reducing the weight by at least half, and reducing the transportation cost;
  • High-voltage DC transmission equipment has no transformer, eliminating the need for transformer cabinets.
  • the structure of HVDC transmission equipment is much simpler, and the production cycle is reduced by at least half, which is also conducive to on-site installation, commissioning and maintenance;
  • the high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, eliminating the energy consumption of the transformer, and without considering the temperature rise effect of the high-voltage direct current transmission equipment on the transformer;
  • High-voltage DC transmission equipment has no transformer, eliminating the need for transformer cabinets, and has an absolute market competitive advantage.
  • Figure 1 is a top view of a transformerless high voltage direct current transmission composed of a half bridge power unit
  • FIG. 2 is a topological structural diagram of a transformerless high voltage direct current transmission composed of an H-bridge power unit
  • Figure 3 is a current flow diagram in a half bridge power unit
  • FIG. 4 is a current flow diagram in an H-bridge power unit. detailed description
  • a transformerless high-voltage DC transmission topology including high-voltage charging circuit, inductor L, rectifier circuit, inverter circuit, high-voltage power grid directly through the high-voltage charging circuit, coupled or uncoupled inductor L into the high voltage Inverter rectifier circuit, the rectified DC voltage is sent to the inverter circuit through a long-distance cable to supply power to the inverter circuit, and the inverter output is connected to the coupled or uncoupled inductor L2.
  • the high voltage charging circuit is composed of a charging resistor R and a switch KM in parallel.
  • the rectifier circuit and the inverter circuit are three-phase, each phase is formed by connecting even number of n power units in series, and is divided into two groups.
  • the number of power units in each group is n/2, and the input end of each phase of the rectifier circuit is The midpoint of the two sets of cells, and the input end and each set of cells are connected by a coupled or uncoupled inductor L1; the output end of each phase of the inverter circuit is at the midpoint of the two sets of cells, and the output end and each set of cells They are also connected by a coupled or uncoupled inductor L2.
  • the power unit of the rectifier circuit and the inverter circuit may be a half bridge structure composed of two IGBT switching devices (Fig. 1); or
  • the power unit of the rectifier circuit and the inverter circuit is an H-bridge structure composed of four IGBT switching devices (Fig. 2).
  • a three-phase controllable rectifier circuit is composed of a plurality of power units, and the capacitance voltage of each power unit is constant; the output of the high-voltage frequency converter is connected to the coupled inductor or the uncoupled inductor to make the output waveform more stable and smooth; each rectifier circuit, inverse
  • the variable circuit power unit adopts half bridge type or H bridge type to meet the requirements of PWM waveform generation; the power unit structure adopted by the rectifier circuit and the inverter circuit can be designed to be completely consistent and can be called each other.
  • the current flows from A to B via IGBT2, and the power unit output level of the half-bridge inverter circuit is "0".
  • the current flows through the freewheeling diode D2 from B to A, and the power unit output level of the half-bridge inverter circuit is "0".
  • the current flows through the freewheeling diode D1, and then flows from A to B through the DC-side capacitor C.
  • the power unit output level of the half-bridge inverter circuit is "1".
  • the current flows through IGBT1 and then through DC-side capacitor C, from B to A.
  • the power unit output level of the half-bridge inverter circuit is "1".
  • the current flows through IGBT2, DC side capacitor C, IGBT3, from B to A, or current through freewheeling diode D3, DC side capacitor C, freewheeling diode D2, from A to B, at this time using H bridge
  • the power unit output level of the inverter circuit is "1".
  • the current flows through the freewheeling diode Dl, IGBT3, from B to A, or current through the freewheeling diode D3, IGBT1, from A to B, at this time using the H-bridge inverter circuit power unit output level "0".
  • the current flows through the freewheeling diode Dl, the DC side capacitor C, and the freewheeling diode D4, from B to A, or the current flows through the IGBT4, the DC side capacitor C, and the IGBT1, from A to B.
  • the H bridge is used.
  • the power unit output level of the inverter circuit is "-1".
  • the high voltage power grid directly enters the high voltage inverter rectifier circuit through the high voltage charging circuit and the coupled or uncoupled inductor; a three-phase controllable rectification system is composed of a plurality of power units, and the capacitor voltage of each power unit is constant, thereby stabilizing the cable voltage; The output of the inverter is connected to the coupled inductor or uncoupled inductor to make the output waveform more stable and smooth.
  • Each inverter unit of the power unit adopts half bridge or H bridge to meet the requirements of PWM waveform generation; rectifier circuit and inverter
  • the power unit used in the circuit has the same structure and can be called from each other.

Abstract

A transformerless high voltage direct current transmission topological structure comprising a high voltage charging circuit (R, KM), inductors (L1, L2), a rectifier circuit, and an inverter circuit. A high voltage power grid connects directly to the rectifier circuit via the high voltage charging circuit (R, KM) and the coupling or non-coupling inductor (L1). A rectified direct current supplies power to the inverter circuit via a long distance power line. An output terminal of the inverter circuit connects to the coupling or non-coupling inductor (L2). The rectifying circuit and the inverter circuit are both constituted by a plurality of power units, wherein each of the power units is a half-bridge structure or an H-bridge structure constituted by switch elements. The present topological structure enables a high voltage direct current transmission to achieve long distance, high capacity power transmission without requiring a transformer.

Description

一种无变压器的高压直流输电拓扑结构 技术领域  Transformerless high voltage direct current transmission topology
本发明涉及一种高压直流输电拓扑结构， 特别是一种无变压器的高压直流输电拓扑结 构。 背景技术  The invention relates to a high voltage direct current transmission topology, in particular to a transformerless high voltage direct current transmission topology. Background technique
我国能源资源与用电负荷分布的特殊性， 成为发展远距离、大容量输电的必然性。尤其 是超过 600 km以上的远程输电线路， 采用高压直流输电更加节能、 降耗， 提高经济效益， 实现更大范围内的能源资源的合理开发、 优化配置， 符合我国 "西电东送" 的国情。  The particularity of China's energy resources and power load distribution has become the inevitability of developing long-distance and large-capacity power transmission. Especially for long-distance transmission lines over 600 km, the use of high-voltage direct current transmission is more energy-efficient and consumes less, improving economic efficiency, achieving rational development and optimal allocation of energy resources within a larger scope, in line with China's "West-to-East Power Transmission" national conditions. .
随着电力电子和计算机技术的迅速发展，高压直流输电技术日趋完善，在输电能力和送 电距离上已可和特高压交流竞争， 并且相对于特高压交流输电技术， 高压直流输电技术有如 下优点- With the rapid development of power electronics and computer technology, HVDC transmission technology is becoming more and more perfect, and it can compete with UHV communication in transmission capacity and transmission distance. Compared with UHV AC transmission technology, HVDC transmission technology has the following advantages. -
1、 输送相同功率时， 高压直流输电所用线材仅为交流输电的 2 / 3〜1 / 2; 1. When the same power is delivered, the wire used for HVDC transmission is only 2 / 3~1 / 2 of AC transmission;
2、 在电缆输电线路中，高压直流输电没有电容电流产生，而高压交流输电线路存在 电容电流， 引起损耗；  2. In the cable transmission line, there is no capacitor current generated by the high-voltage direct current transmission, and the capacitor current exists in the high-voltage AC transmission line, causing loss;
3、 在一些特殊场合， 必须用电缆输电， 例如高压输电线经过大城市时， 采用地下电 缆； 输电线经过海峡时， 要用海底电缆；  3. In some special occasions, it is necessary to use cable transmission. For example, when a high-voltage transmission line passes through a large city, an underground cable is used; when the transmission line passes through the channel, a submarine cable is used;
4、 高压直流输电时，其两侧交流系统不需同步运行，而高压交流输电必须同步运行； 5、 高压直流输电发生故障的损失比高压交流输电小。高压直流输电中， 由于采用可 控硅装置， 电路功率能迅速、 方便地进行调节， 高压直流输电线路上基本上不向发生短路的 高压交流系统输送短路电流， 故障侧交流系统的短路电流与没有互连时一样。  4. When HVDC power transmission, the AC systems on both sides do not need to run synchronously, and the high-voltage AC transmission must run synchronously; 5. The loss of HVDC transmission is smaller than that of high-voltage AC transmission. In high-voltage direct current transmission, the circuit power can be adjusted quickly and conveniently due to the use of the thyristor device. The high-voltage direct current transmission line basically does not supply short-circuit current to the high-voltage AC system where the short circuit occurs, and the short-circuit current of the fault-side AC system is not The same is true when interconnecting.
目前，变压器是所有的高压直流输电设备中必不可缺的一部分，所以变压器柜在整个高 压直流输电设备里， 占据了很大比重的成本及体积， 并且容量越大的高压输电设备， 其对变 压器的容量要求也越高， 这样使高压直流输电设备的成本也直线上升。 发明内容  At present, the transformer is an indispensable part of all HVDC transmission equipment, so the transformer cabinet occupies a large proportion of the cost and volume in the entire HVDC transmission equipment, and the larger the capacity of the high-voltage transmission equipment, the transformer The higher the capacity requirements, the higher the cost of HVDC transmission equipment. Summary of the invention
本发明的目的是提供一种无变压器的高压直流输电拓扑结构， 该拓扑结构使高压直流输 电设备无需变压器即可实现长距离、 大容量电能传输的目的。  The object of the present invention is to provide a transformerless high voltage direct current transmission topology which enables high voltage direct current transmission equipment to realize long distance and large capacity power transmission without a transformer.
为实现上述目的， 本发明通过以下技术方案实现：  To achieve the above object, the present invention is achieved by the following technical solutions:
一种无变压器的高压直流输电拓扑结构， 其特征在于， 包括高压充电电路、 电感、 整流 电路、 逆变电路， 高压电网直接经过高压充电电路、 耦合或非耦合电感后进入高压变频器整 流电路， 经整流后的直流电压通过长距离的电缆输送至逆变电路为逆变电路供电， 逆变输出 端接入耦合或非耦合电感。 所述的整流电路、 逆变电路的功率单元为两个 IGBT开关器件组成的半桥结构。 A transformerless high voltage direct current transmission topology, characterized in that it comprises a high voltage charging circuit, an inductor, a rectifying circuit and an inverter circuit, and the high voltage power grid directly enters the high voltage inverter rectifying circuit after passing through a high voltage charging circuit, a coupled or uncoupled inductor, The rectified DC voltage is supplied to the inverter circuit through a long-distance cable to the inverter circuit, and the inverter output is coupled to a coupled or uncoupled inductor. The power unit of the rectifier circuit and the inverter circuit is a half bridge structure composed of two IGBT switching devices.
所述的整流电路、 逆变电路的功率单元为四个 IGBT开关器件组成的 H桥结构。  The power unit of the rectifier circuit and the inverter circuit is an H-bridge structure composed of four IGBT switching devices.
所述的整流电路与逆变电路采用的功率单元相同， 可相互替代。  The rectifier circuit is the same as the power unit used in the inverter circuit and can be replaced by each other.
整流电路与逆变电路均为三相， 每相由偶数 n个功率单元串联而成， 分为上下两组， 每 组的功率单元个数为 n/2个， 整流电路每相的输入端为两组单元的中点处， 且输入端与每组 单元之间以耦合或非耦合电感连接； 逆变电路每相的输出端为两组单元的中点处， 且输出端 与每组单元之间也以耦合或非耦合电感连接。  The rectifier circuit and the inverter circuit are three-phase, each phase is formed by connecting even number of n power units in series, and is divided into two groups. The number of power units in each group is n/2, and the input end of each phase of the rectifier circuit is At the midpoint of the two sets of cells, and the input end and each set of cells are connected by a coupled or uncoupled inductor; the output end of each phase of the inverter circuit is at the midpoint of the two sets of cells, and the output end and each set of cells They are also connected by a coupled or uncoupled inductor.
与现有技术相比， 本发明的新颖性和创造性体现在：  Compared with the prior art, the novelty and inventiveness of the present invention are embodied in:
1 ) 高压直流输电设备没有变压器， 省去了变压器柜， 使成本至少减小一半；  1) The high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, so that the cost is reduced by at least half;
2) 高压直流输电设备没有变压器， 省去了变压器柜， 使体积至少减小一半， 在现场的 占地面积也因此至少减小一半；  2) The high-voltage DC transmission equipment has no transformer, eliminating the transformer cabinet, reducing the volume by at least half, and reducing the floor space at least by half;
3 ) 高压直流输电设备没有变压器， 省去了变压器柜， 使重量至少减小一半， 运输成本 也相应减小；  3) The high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, reducing the weight by at least half, and reducing the transportation cost;
4) 高压直流输电设备没有变压器， 省去了变压器柜， 高压直流输电设备的结构相比简 单很多， 生产周期至少减小一半， 也有利于现场的安装、 调试和维护；  4) High-voltage DC transmission equipment has no transformer, eliminating the need for transformer cabinets. The structure of HVDC transmission equipment is much simpler, and the production cycle is reduced by at least half, which is also conducive to on-site installation, commissioning and maintenance;
5 ) 高压直流输电设备没有变压器， 省去了变压器柜， 省去了在变压器的能耗， 也无需 考虑高压直流输电设备在变压器上的温升效应；  5) The high-voltage direct current transmission equipment has no transformer, eliminating the transformer cabinet, eliminating the energy consumption of the transformer, and without considering the temperature rise effect of the high-voltage direct current transmission equipment on the transformer;
6) 高压直流输电设备没有变压器， 省去了变压器柜， 具有绝对的市场竞争力优势。 附图说明  6) High-voltage DC transmission equipment has no transformer, eliminating the need for transformer cabinets, and has an absolute market competitive advantage. DRAWINGS
图 1是半桥式功率单元组成的无变压器的高压直流输电拓扑结构图；  Figure 1 is a top view of a transformerless high voltage direct current transmission composed of a half bridge power unit;
图 2是 H桥式功率单元组成的无变压器的高压直流输电拓扑结构图；  2 is a topological structural diagram of a transformerless high voltage direct current transmission composed of an H-bridge power unit;
图 3是半桥式功率单元内电流流向图；  Figure 3 is a current flow diagram in a half bridge power unit;
图 4是 H桥式功率单元内电流流向图。 具体实施方式  Figure 4 is a current flow diagram in an H-bridge power unit. detailed description
见图 1、 图 2， 一种无变压器的高压直流输电拓扑结构， 包括高压充电电路、 电感 L、 整 流电路、逆变电路， 高压电网直接经过高压充电电路、耦合或非耦合电感 L后进入高压变频 器整流电路， 经整流后的直流电压通过长距离的电缆输送至逆变电路为逆变电路供电， 逆变 输出端接入耦合或非耦合电感 L2。 高压充电电路由充电电阻 R与开关 KM并联组成。  See Figure 1, Figure 2, a transformerless high-voltage DC transmission topology, including high-voltage charging circuit, inductor L, rectifier circuit, inverter circuit, high-voltage power grid directly through the high-voltage charging circuit, coupled or uncoupled inductor L into the high voltage Inverter rectifier circuit, the rectified DC voltage is sent to the inverter circuit through a long-distance cable to supply power to the inverter circuit, and the inverter output is connected to the coupled or uncoupled inductor L2. The high voltage charging circuit is composed of a charging resistor R and a switch KM in parallel.
整流电路与逆变电路均为三相， 每相由偶数 n个功率单元串联而成， 分为上下两组， 每 组的功率单元个数为 n/2个， 整流电路每相的输入端为两组单元的中点处， 且输入端与每组 单元之间以耦合或非耦合电感 L1连接； 逆变电路每相的输出端为两组单元的中点处， 且输 出端与每组单元之间也以耦合或非耦合电感 L2连接。  The rectifier circuit and the inverter circuit are three-phase, each phase is formed by connecting even number of n power units in series, and is divided into two groups. The number of power units in each group is n/2, and the input end of each phase of the rectifier circuit is The midpoint of the two sets of cells, and the input end and each set of cells are connected by a coupled or uncoupled inductor L1; the output end of each phase of the inverter circuit is at the midpoint of the two sets of cells, and the output end and each set of cells They are also connected by a coupled or uncoupled inductor L2.
整流电路、逆变电路的功率单元可为两个 IGBT开关器件组成的半桥结构（图 1 ); 或者， 整流电路、 逆变电路的功率单元为四个 IGBT开关器件组成的 H桥结构 （图 2)。 The power unit of the rectifier circuit and the inverter circuit may be a half bridge structure composed of two IGBT switching devices (Fig. 1); or The power unit of the rectifier circuit and the inverter circuit is an H-bridge structure composed of four IGBT switching devices (Fig. 2).
由多个功率单元组成一个三相可控整流电路， 恒定每个功率单元的电容电压； 高压变频 器输出端接入耦合电感或非耦合电感， 使输出波形更加稳定平滑； 每个整流电路、 逆变电路 功率单元采用半桥式或 H桥式均可满足 PWM波形生成的需求；整流电路和逆变电路所采用 的功率单元结构可设计成完全一致， 可相互调用。  A three-phase controllable rectifier circuit is composed of a plurality of power units, and the capacitance voltage of each power unit is constant; the output of the high-voltage frequency converter is connected to the coupled inductor or the uncoupled inductor to make the output waveform more stable and smooth; each rectifier circuit, inverse The variable circuit power unit adopts half bridge type or H bridge type to meet the requirements of PWM waveform generation; the power unit structure adopted by the rectifier circuit and the inverter circuit can be designed to be completely consistent and can be called each other.
见图 3-1， 电流经 IGBT2从 A流向 B， 采用半桥式逆变电路的功率单元输出电平 "0"。 见图 3-2， 电流经续流二极管 D2从 B流向 A，采用半桥式逆变电路的功率单元输出电平 "0"。  As shown in Figure 3-1, the current flows from A to B via IGBT2, and the power unit output level of the half-bridge inverter circuit is "0". As shown in Figure 3-2, the current flows through the freewheeling diode D2 from B to A, and the power unit output level of the half-bridge inverter circuit is "0".
见图 3-3， 电流经续流二极管 Dl， 再通过直流侧电容 C， 从 A流向 B， 采用半桥式逆变 电路的功率单元输出电平 " 1 "。  As shown in Figure 3-3, the current flows through the freewheeling diode D1, and then flows from A to B through the DC-side capacitor C. The power unit output level of the half-bridge inverter circuit is "1".
见图 3-4， 电流经 IGBT1 , 再通过直流侧电容 C， 从 B流向 A， 采用半桥式逆变电路的 功率单元输出电平 " 1 "。  As shown in Figure 3-4, the current flows through IGBT1 and then through DC-side capacitor C, from B to A. The power unit output level of the half-bridge inverter circuit is "1".
见图 4-1， 电流经 IGBT2、 直流侧电容 C、 IGBT3, 从 B流向 A， 或电流经续流二极管 D3、 直流侧电容 C、 续流二极管 D2， 从 A流向 B， 此时采用 H桥式逆变电路的功率单元输 出电平 " 1 "。  As shown in Figure 4-1, the current flows through IGBT2, DC side capacitor C, IGBT3, from B to A, or current through freewheeling diode D3, DC side capacitor C, freewheeling diode D2, from A to B, at this time using H bridge The power unit output level of the inverter circuit is "1".
见图 4-2，电流经续流二极管 Dl、 IGBT3,从 B流向 A，或电流经续流二极管 D3、 IGBT1 , 从 A流向 B， 此时采用 H桥式逆变电路的功率单元输出电平 "0"。  As shown in Figure 4-2, the current flows through the freewheeling diode Dl, IGBT3, from B to A, or current through the freewheeling diode D3, IGBT1, from A to B, at this time using the H-bridge inverter circuit power unit output level "0".
见图 4-3， 电流经 IGBT2、 续流二极管 D4， 从 B流向 A， 或电流经 IGBT4、 续流二极管 D2， 从 A流向 B， 此时采用 H桥式逆变电路的功率单元输出电平 "0"。  See Figure 4-3. The current flows through IGBT2, freewheeling diode D4, from B to A, or current flows through IGBT4, freewheeling diode D2, from A to B. At this time, the power unit output level of the H-bridge inverter circuit is used. "0".
见图 4-4， 电流经续流二极管 Dl、 直流侧电容 C、 续流二极管 D4， 从 B流向 A， 或电 流经 IGBT4、直流侧电容 C、 IGBT1 , 从 A流向 B， 此时采用 H桥式逆变电路的功率单元输 出电平 "-1 "。  As shown in Figure 4-4, the current flows through the freewheeling diode Dl, the DC side capacitor C, and the freewheeling diode D4, from B to A, or the current flows through the IGBT4, the DC side capacitor C, and the IGBT1, from A to B. At this time, the H bridge is used. The power unit output level of the inverter circuit is "-1".
高压电网直接经过高压充电电路和耦合或非耦合电感进入高压变频器整流电路； 由多个 功率单元组成一个三相可控整流系统，恒定每个功率单元的电容电压，从而稳定住电缆电压； 高压变频器输出端接入耦合电感或非耦合电感， 使输出波形更加稳定平滑； 每个功率单元逆 变电路， 采用半桥式或 H桥式均可满足 PWM波形生成的需求； 整流电路和逆变电路所采用 的功率单元结构完全一致， 可相互调用。  The high voltage power grid directly enters the high voltage inverter rectifier circuit through the high voltage charging circuit and the coupled or uncoupled inductor; a three-phase controllable rectification system is composed of a plurality of power units, and the capacitor voltage of each power unit is constant, thereby stabilizing the cable voltage; The output of the inverter is connected to the coupled inductor or uncoupled inductor to make the output waveform more stable and smooth. Each inverter unit of the power unit adopts half bridge or H bridge to meet the requirements of PWM waveform generation; rectifier circuit and inverter The power unit used in the circuit has the same structure and can be called from each other.

Claims

^ ^ ^ ^
1、 一种无变压器的高压直流输电拓扑结构， 其特征在于， 包括高压充电电路、 电感、 整流电路、 逆变电路， 高压电网直接经过高压充电电路、 耦合或非耦合电感后进入高压变频 器整流电路， 经整流后的直流电压通过长距离的电缆输送至逆变电路为逆变电路供电， 逆变 输出端接入耦合或非耦合电感。 1. A transformerless high voltage direct current transmission topology, characterized in that it comprises a high voltage charging circuit, an inductor, a rectifying circuit and an inverter circuit, and the high voltage power grid directly enters the high voltage inverter through a high voltage charging circuit, a coupled or uncoupled inductor. The circuit, the rectified DC voltage is sent to the inverter circuit through a long-distance cable to supply power to the inverter circuit, and the inverter output is coupled to a coupled or uncoupled inductor.
2、 根据权利要求 1所述的一种无变压器的高压直流输电拓扑结构， 其特征在于， 所述 的整流电路、 逆变电路的功率单元为两个 IGBT开关器件组成的半桥结构。  2. A transformerless high voltage direct current transmission topology according to claim 1, wherein the power unit of the rectifier circuit and the inverter circuit is a half bridge structure composed of two IGBT switching devices.
3、 根据权利要求 1所述的一种无变压器的高压直流输电拓扑结构， 其特征在于， 所述 的整流电路、 逆变电路的功率单元为四个 IGBT开关器件组成的 H桥结构。  3. The transformerless high voltage direct current transmission topology according to claim 1, wherein the power unit of the rectifier circuit and the inverter circuit is an H-bridge structure composed of four IGBT switching devices.
4、 根据权利要求 2或 3所述的一种无变压器的高压直流输电拓扑结构， 其特征在于， 所述的整流电路与逆变电路采用的功率单元结构相同， 可相互替代。  4. A transformerless high voltage direct current transmission topology according to claim 2 or 3, wherein the rectifier circuit and the inverter circuit have the same power unit structure and can be replaced with each other.
5、 根据权利要求 2或 3所述的一种无变压器的高压直流输电拓扑结构， 其特征在于， 整流电路与逆变电路均为三相， 每相由偶数 n个功率单元串联而成， 分为上下两组， 每组的 功率单元个数为 n/2个， 整流电路每相的输入端为两组单元的中点处， 且输入端与每组单元 之间以耦合或非耦合电感连接； 逆变电路每相的输出端为两组单元的中点处， 且输出端与每 组单元之间也以耦合或非耦合电感连接。  5. A transformerless high voltage direct current transmission topology according to claim 2 or 3, wherein the rectifier circuit and the inverter circuit are three-phase, each phase is formed by connecting even number of n power units in series, For the upper and lower two groups, the number of power units in each group is n/2, the input end of each phase of the rectifier circuit is at the midpoint of the two groups, and the input end and each group of units are connected by a coupled or uncoupled inductor. The output of each phase of the inverter circuit is at the midpoint of two groups of cells, and the output terminal is also connected with each group of cells by a coupled or uncoupled inductor.
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