CN101924454B - Thyristor converter valve module for HVDC (High Voltage Direct Current) transmission - Google Patents

Abstract

The invention relates to a thyristor converter valve module for HVDC (High Voltage Direct Current) transmission, which is characterized by comprising two valve sections (1 and 2), wherein each valve section is an integrity in structure and comprises a saturated reactor (3), a thyristor unit (4), a DC isobarometric resistor unit, an energy-taking resistor unit, a damping resistor unit (5), a gate unit (6) and a water-cooling system; and in a thyristor-level assembly, the gate unit (6) is arranged at one side of the thyristor unit (4), and the damping resistor unit (5) and a damping capacitor unit (7) are arranged at the other side of the thyristor unit (4). The valve module is watertight, has the advantages of small geometrical size, light weight, convenient assembly and maintenance, simple technical operation and low requirements on operation skills and can effectively improve the mounting efficiency.

Description

A thyristor converter valve module for high voltage direct current transmission

[technical field]

The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a thyristor converter valve module for high-voltage direct current transmission. the

[Background technique]

As the core component of the HVDC transmission system, the converter valve has been developed and applied for many years. The converter valve module of traditional HVDC power transmission is based on the thyristor series structure as the core, and at the same time includes the control, trigger and protection system of the thyristor. The converter valves currently in operation have some problems, such as easy water leakage, heavy weight, large structural size, and inconvenient installation and maintenance. Water leakage is currently the key factor affecting the safe operation of the converter valve. The structure and weight characteristics of the converter valve are related to the cost of the converter valve and the convenience of installation and maintenance. The installation and maintenance characteristics are related to the converter valve and the reliability of engineering applications. Operability and work efficiency. the

At present, the structure design of the converter valve module is mainly divided into two structural forms: a frame structure and a modular decentralized structure. For the frame structure, metal materials or metal materials and insulating materials are mostly used to form the supporting frame of the valve module, and various components are scattered and arranged inside the valve module. This structural form has the problem of concentrated weight and load. It requires high structural strength of the supporting frame of the valve module and high performance requirements for materials, which increases the design difficulty of the valve module and inevitably increases the weight and structural size of the valve module. For the modular decentralized structure, the thyristor, damping resistor, damping capacitor, gate unit and saturated reactor inside the valve module are assembled in a modular way. This structure design has too many scattered sub-modules inside the valve module. Many, resulting in the difficulty of on-site assembly of the valve module project, and it is not conducive to the improvement of the installation efficiency of the valve module. The operating skills of the installation technicians have high requirements. the

The component selection and replacement of the current converter valves in operation is slow, the minimum technology of the current components is not applied, and it cannot meet the needs of the current DC transmission boost and capacity increase. the

[Content of the invention]

The object of the present invention is to provide a thyristor converter valve module for high-voltage direct current transmission in view of the above-mentioned defects in the prior art. The valve module is not easy to leak, has small geometric dimensions, light weight, convenient assembly and maintenance It can effectively improve the installation efficiency of the valve module, and the technical operation of the installation is relatively simple, and the requirements for the operation skills of the technicians who install the valve module are not high. the

The present invention provides a thyristor converter valve module for high-voltage direct current transmission, wherein the thyristor converter valve module includes two valve sections, each valve section is structurally a whole, and each valve section includes Saturable reactor, thyristor unit, DC voltage equalizing resistance unit, energy obtaining resistance unit, damping resistance unit, gate unit and water cooling system; said thyristor unit, damping resistance unit, DC voltage equalizing resistance unit, energy obtaining resistance unit, gate The pole unit and the damping capacitor unit are fixedly connected to form a structurally integrated thyristor-level assembly; in a thyristor-level assembly, the gate unit is located on one side of the thyristor unit, and the damping resistance unit and damping capacitor unit are located on the other side of the thyristor unit. side. the

In the thyristor converter valve module for high-voltage direct current transmission provided by the present invention, the thyristor unit is composed of several thyristor stages connected in series, and each thyristor stage is vertically arranged in the thyristor unit; each thyristor stage includes several thyristors, There are radiators on both sides of each thyristor; each thyristor stage corresponds to a damping resistor unit, damping capacitor unit, DC voltage equalizing resistor unit, energy harvesting resistor unit and gate unit; for each thyristor stage, a damping capacitor unit Arranged horizontally. the

In the thyristor converter valve module for high-voltage direct current transmission provided by the present invention, in each valve section, the center of gravity of the saturated reactor and the thyristor unit is close to the geometric center of the valve module frame. the

In the thyristor converter valve module for high-voltage direct current transmission provided by the present invention, the thyristor-level component and a saturated reactor are electrically connected in series to form a valve section. the

In the thyristor converter valve module for high-voltage direct current transmission provided by the present invention, the two valve sections and between the saturated reactor and the thyristor-level components are electrically connected by soft connection busbars. the

In the thyristor converter valve module for high-voltage direct current transmission provided by the present invention, the water system, that is, in each valve section, a main water inlet pipe is provided between the thyristor unit and the gate unit, and between the damping resistance unit and the gate unit. A main water return pipe is arranged between the damping capacitor units; branch water pipes are respectively arranged on the main water inlet pipe and the main water return pipe. the

Above-mentioned technical scheme and design thereof:

The two valve sections include a structural support frame composed of aluminum alloy beams and insulating groove beams, and the casket-level components are installed on the structural support frame. the

The periphery of the thyristor converter valve module is provided with an arc-shaped shield with corners and short shields; the corner shield is located on the aluminum alloy beam near the saturated reactor in the valve section, and the short shield is The shielding cover is located on the insulating groove beam on the side close to the gate unit in the valve section. the

The damping resistance unit is small and modular, and its shell is made of flame-retardant plastic material; the damping capacitor unit is a dry capacitor. the

Damping capacitance Capacitors are divided into two types: capacitors with two terminals or capacitors with three terminals, each of which has a terminal located at the tail of the capacitor and also serves as a fixed terminal of the capacitor. the

Modularized thick film resistors are used for DC voltage equalizing resistors and energy harvesting resistors. the

A. The design of the valve module: divide the valve module into two identical valve sections, and each valve section is structurally a whole, so that the weight load of the valve module can be effectively dispersed, and the weight of a valve module The weight is distributed on the two valve sections, which reduces the requirements for the structural design strength of the valve module weight and load, and also reduces the requirements for material properties. Structural supports with lower strength and smaller cross-sectional dimensions can be selected, which is effective Reduce cost, geometry and weight of valve modules. the

For each valve section, the thyristor-level components and the saturable reactor components adopt a modular design and are relatively independent. A valve module consists of two thyristor-level components and two saturable reactor components. the

B. For a thyristor-level component, the gate unit, damping resistor and damping capacitor unit are respectively located on both sides of the thyristor unit. In terms of structural design:

The center of gravity of the thyristor-level components does not deviate too far from the geometric center, which is conducive to improving the force condition of the valve section frame; for a valve section, the weight of the saturated reactor and the thyristor unit, whose center of gravity is close to the geometric center of the valve section structure, thus The stress condition of the whole valve section is improved. the

For a thyristor stage, the damping capacitor unit is placed horizontally, which shortens the distance between the damping capacitor terminal and other electrical connection components, shortens the electrical wiring length of the thyristor stage, and optimizes the electrical performance of the thyristor stage. the

C. In the electrical connection of the valve module, the saturable reactor component inside a valve section and the thyristor-level component are electrically connected by a soft connection busbar, and even two valve sections are also connected by a soft connection busbar: it can avoid Since the vibration generated during the operation of the converter valve causes damage to the connecting busbars, it can also ensure the long-term connection reliability between the connecting busbars and improve the safety of the converter valve. the

D. In terms of waterway design: the full-parallel waterway design ensures a better cooling effect, and also ensures the consistency of the cooling effect of the thyristor-level cooled components, which is conducive to keeping the performance of components from appearing due to differences in cooling temperature performance difference. In the design of the water pipe, use a water pipe with a larger inner diameter. Larger inner diameter water pipes and fully parallel waterway design can effectively reduce the water pressure requirements in the water cooling system, thereby avoiding the occurrence of water pipe joint leakage caused by excessive water pressure, and improving the working life of the waterway piping system , which improves the reliability of the long-term operation of the valve module. the

E. In the selection of components: the damping resistance of the plastic shell with a small modular design can reduce the geometric size of the valve module, reduce the weight of the valve module, and facilitate the assembly of the valve module. The damping capacitor is a dry-type air-filled capacitor, which is small in size and light in weight, which is conducive to structural layout and installation, and can reduce the structural size and weight of the valve module. the

F. Since the insulating material of the valve module is made of flame-retardant materials, and the shell of the damping resistor is made of flame-retardant materials, and the damping capacitor adopts a dry design: the fire-proof characteristics of the valve module are increased, so that the valve module has good performance. The flame retardant properties can effectively reduce the product loss caused by fire. the

G. The aluminum alloy beams and insulating groove beams of the valve section constitute a structural support frame: used to support saturated reactors and thyristor-level components. the

H. For a valve section, the main water inlet pipe is arranged between the thyristor unit and the gate unit, and the main water return pipe is arranged between the damping resistor and the damping capacitor; multiple branch water pipes are arranged on the main water inlet pipe and the main return water pipe :

The main water inlet pipe directly supplies water to the thyristor radiator through the branch water pipe, and the water path returns to the main return water pipe through the branch water pipe between the thyristor radiator and the damping resistor; the water circuit of the thyristor level adopts a full parallel design; the water cooling system cools the saturated reactor at the same time The winding and iron core, the cooling water circuit of the saturated reactor winding and the cooling water circuit of the iron core are also designed in parallel; the water system between the two valve sections is relatively independent. the

In addition, for a thyristor-level component, the thyristor unit, the DC voltage sharing resistor and the energy-taking resistor constitute a separate sub-module, and the damping resistor unit, damping capacitor unit and gate unit are also designed as separate sub-modules, which can be assembled independently. After each sub-module is assembled, it is then assembled into a thyristor-level assembly. the

The valve module is made of insulating materials with flame retardant properties, and the components are also considered in the selection of flame retardant properties. For example, dry capacitors are used for damping capacitors instead of oil-filled capacitors, and the shell of damping resistors is made of flame retardant material. This module combines the thyristors in series to meet the requirements of different transmission power and different transmission voltage levels. the

Compared with the prior art, a thyristor converter valve module for high-voltage direct current transmission provided by the present invention has the following advantages:

1. Not easy to leak, small geometric size, light weight, easy to assemble. the

2. The structural strength of the supporting frame of the valve module is not high, and the performance requirements of the material are not high, which reduces the design difficulty of the valve module and avoids increasing the weight and structural size of the valve module. the

3. There is no problem of too many scattered sub-modules inside the valve module, which reduces the difficulty of on-site assembly of the valve module project and effectively improves the installation efficiency of the valve module. the

4. The modular decentralized structure does not have high requirements for the accuracy of on-site installation, the technical operation of the installation is relatively simple, and the requirements for the operating skills of the technicians who install the valve modules are not high. the

5. It can meet the needs of current DC transmission boost and capacity increase. the

6. It can be applied to different voltage levels on the DC (direct current) side, including UHV 800kV and above. the

[Description of drawings]

Figure 1-2 is a schematic diagram of the overall structure of a thyristor converter valve module for high-voltage direct current transmission according to the present invention. the

Fig. 3 is a structural schematic diagram of a valve segment support frame, a damping resistance unit and a damping capacitor unit of a thyristor converter valve module for high-voltage direct current transmission according to the present invention. the

In the figure: 1. valve section; 2. valve section; 3. saturated reactor; 4. thyristor unit; 5. damping resistance unit; 6. gate unit; 7. damping capacitor unit; 8. corner shield; 9. Short shielding cover; 10, supporting frame. the

[Detailed ways]

The thyristor converter valve module for high-voltage direct current transmission provided by the present invention will be further described in more detail through specific implementation methods in conjunction with the accompanying drawings. the

[Example 1]

In the thyristor converter valve module used for high-voltage direct current transmission in this embodiment, the insulating material of the valve module is a flame-retardant plastic material, and the shell of the damping resistor is made of a flame-retardant plastic material, and the damping capacitor is an air-filled capacitor. : The fire-proof characteristics of the valve module are increased, so that the valve module has good flame-retardant characteristics, which can effectively reduce product loss caused by fire. the

The thyristor converter valve module includes two valve sections, valve section 1 and valve section 2, and each valve section is structurally integrated: in order to effectively disperse the weight load of the valve module, a valve module The weight of the valve is distributed on the two valve sections, which reduces the requirements of the weight load of the valve module on the structural design strength, and also reduces the requirements on the material properties. Structural supports with lower strength and smaller cross-sectional dimensions can be selected, which is effective The cost, geometry and weight of the valve module are reduced. the

Each valve section includes a saturated reactor 3, a thyristor unit 4, a DC equalizing resistance unit, an energy-taking resistance unit, a damping resistance unit 5, a gate unit 6 and a water cooling system; the thyristor unit 4, the damping resistance unit 5, the DC The voltage equalizing resistance unit, the energy-taking resistance unit, the gate unit 6 and the damping capacitor unit 7 are fixedly connected to form a structurally integrated thyristor-level assembly; in a thyristor-level assembly, the gate unit 6 is located at one of the thyristor units 4 On one side, the damping resistance unit 5 and the damping capacitor unit 7 are located on the other side of the thyristor unit 4. In addition, the DC equalizing resistance unit and the thyristor unit 4 are integrated, that is, the two sides of the thyristor in the thyristor unit 4 are provided with DC Voltage equalizing resistors, a number of such DC voltage equalizing resistor structures form a DC voltage equalizing resistance unit; the energy-taking resistance unit and the damping resistance unit 5 are installed in the same box to make it structurally integrated. the

The thyristor unit 4 is composed of several thyristor stages connected in series, and each thyristor stage is vertically arranged in the thyristor unit 4; each thyristor stage includes several thyristors, and each thyristor is provided with radiators on both sides; each thyristor stage corresponds to A damping resistor unit 5, a damping capacitor unit 7, a DC equalizing resistor unit, an energy-taking resistor unit and a gate unit 6; for each thyristor stage, the damping capacitor unit 7 is arranged horizontally; the horizontal arrangement shortens the wiring of the damping capacitor The distance between the terminal and other electrical connection components can shorten the electrical wiring length of the thyristor stage and optimize the electrical performance of the thyristor stage. the

In each valve section, the center of gravity of the saturable reactor 3 and the thyristor unit 4 is close to the geometric center of the valve module frame 10, that is, the weight of the thyristor unit 4 and the saturated reactor 3 is close to the geometric center of the valve section structure, thus The stress condition of the whole valve section is improved; in addition, the thyristor-level components are connected in series with the saturated reactor 3 . the

The center of gravity of the thyristor-level components deviates slightly from its geometric center, that is, the center of gravity of the thyristor-level components does not deviate too far from the geometric center, which is conducive to improving the force condition of the valve section frame 10 . the

The thyristor-level component and a saturable reactor 3 are electrically connected in series to form a valve section. the

Between the two valve sections 1 and 2 and between the saturable reactor 3 and the thyristor-level components, a soft connection busbar is used for electrical connection: it can avoid damage to the connecting busbar due to the vibration generated by the converter valve during operation , At the same time, it can also ensure the long-term connection reliability between the connecting busbars, and improve the safety of the converter valve. the

In each valve section, a main water inlet pipe is provided between the thyristor unit 4 and the gate pole unit 6, and a main water return pipe is provided between the damping resistance unit 5 and the damping capacitor unit 7; Branch water pipes are respectively provided. The main water inlet pipe directly supplies water to the thyristor radiator through the branch water pipe, and the water path returns to the main return water pipe through the branch water pipe between the thyristor radiator and the damping resistor; the water path of the thyristor level adopts a full parallel design. The water cooling system cools the winding and core of the saturated reactor at the same time, and the cooling water circuit of the saturated reactor winding and the core cooling water circuit are also designed in parallel; the water system between the two valve sections is relatively independent. the

In addition, the periphery of the thyristor converter valve module is provided with an arc-shaped shield including the corner shield 8 and the short shield 9; the corner shield 8 is located on the side of the valve section near the saturated reactor 3 On the aluminum alloy beam, the short shield 9 is located on the insulating groove beam on the side of the valve section close to the gate unit. the

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: a skilled person reads this After the description of the application, the specific implementation mode of the present invention can still be modified or equivalently replaced, but none of these modifications or changes departs from the protection scope of the pending claims of the present application. the

Claims (3)

1. A thyristor converter valve module for high voltage direct current transmission, characterized in that said thyristor converter valve module comprises two valve sections (1,2), each valve section is structurally a whole, Each valve section includes a saturated reactor (3), a thyristor unit (4), a DC voltage equalizing resistance unit, an energy-taking resistance unit, a damping resistance unit (5), a gate unit (6) and a water cooling system; the thyristor unit (4), the damping resistance unit (5), the DC voltage equalizing resistance unit, the energy-taking resistance unit, the gate unit (6) and the damping capacitance unit (7) are fixedly connected into a structurally integrated thyristor level assembly; In a thyristor-level assembly, the gate unit (6) is located on one side of the thyristor unit (4), and the damping resistance unit (5) and damping capacitor unit (7) are located on the other side of the thyristor unit (4); The thyristor unit (4) is composed of several thyristor stages connected in series, and each thyristor stage is vertically arranged in the thyristor unit (4); each thyristor stage includes several thyristors, and each thyristor is provided with radiators on both sides; each Each thyristor level corresponds to a damping resistance unit (5), a damping capacitance unit (7), a DC voltage equalizing resistance unit, an energy harvesting resistance unit and a gate unit (6); for each thyristor level, a damping capacitance unit (7 ) is arranged horizontally; In each valve section, the center of gravity of the saturable reactor (3) and the thyristor unit (4) is close to the geometric center of the valve module frame; The number of damping capacitor units (7) is 18; The water cooling system, that is, in each valve section, a main water inlet pipe is provided between the thyristor unit (4) and the gate unit (6), and between the damping resistance unit (5) and the damping capacitor unit (7) The main water return pipe is provided; the main water inlet pipe and the main return water pipe are respectively provided with branch water pipes; the water cooling system cools the winding and iron core of the saturated reactor (3) at the same time, and the winding cooling water circuit of the saturated reactor (3) and the iron core cooling water circuit are connected in parallel design; The damping capacitance capacitor of the damping capacitance unit is divided into two types: a capacitor with two terminals or a capacitor with three terminals, each of which has a terminal located at the tail of the capacitor and also serves as a fixed terminal of the capacitor; The saturable reactor (3) adopts an open structure and is not packaged in an insulating case; the saturable reactor is fixed by suspension support. 2. The valve module according to claim 1, characterized in that the thyristor-level assembly and a saturable reactor (3) are electrically connected in series to form a valve section. 3. The valve module according to claim 1, characterized in that the two valve sections (1, 2) and between the saturable reactor (3) and the thyristor-level components are electrically connected by soft connection busbars .