CN112531669B - Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station - Google Patents
Method for constructing receiving end voltage source converter station of hybrid direct current transmission system and converter station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a method for constructing a receiving-end voltage source converter station of a hybrid direct-current transmission system, which comprises the following steps: the diode-end arrester DA is connected to two ends of the current-limiting diode, rated voltage of the diode-end arrester DA is 396kV, operation impact protection level of the diode-end arrester DA is 565kV, and the number of the diode-end arrester DA columns is 8 columns. The current-limiting reactor end arresters DR are connected to two ends of the polar current-limiting reactors, rated voltage of the polar current-limiting reactor end arresters DR is 629kV, operation impact protection level of the polar current-limiting reactor end arresters DR is 904kV, and the number of polar current-limiting reactor end arresters DR is 4 columns. The neutral bus arrester CBN1 in the valve hall is connected between the lower bridge arm converter valve and the current-limiting diode, the rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operation impact protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 is 8 columns.
Description
Technical Field
The invention relates to the field of overvoltage and insulation coordination in high-voltage technology, in particular to an operating overvoltage characteristic and lightning arrester optimal configuration scheme when a current-limiting diode is adopted by a receiving end voltage source converter station of a hybrid direct-current transmission system, and a method and a converter station for constructing the receiving end voltage source converter station of the hybrid direct-current transmission system.
Background
The traditional direct current transmission is also called as high-voltage direct current transmission (CSC-HVDC) of a current source converter, and by virtue of the advantages of the traditional direct current transmission in the aspects of long-distance large-capacity transmission and grid interconnection, the traditional direct current transmission has become a main transmission mode of western electric east transmission and north electric south transmission in China. However, since CSC-HVDC uses a thyristor of a semi-controlled power electronic device as a converter element, there are significant drawbacks, mainly represented by: the method is completely dependent on the operation of an alternating current power grid, has the problem of commutation failure, and lacks operation independence. The voltage source converter based on the fully controlled device can exactly compensate the main defects of the CSC-HVDC by high-voltage direct-current transmission (VSC-HVDC), and has the main advantages that: independent of the AC power grid operation, no commutation failure problem exists, no or only a small amount of reactive compensation equipment is needed, and the active power and the reactive power can be operated in four quadrants. The disadvantages of this are mainly that the capacity and voltage class are still small, the running losses are large, etc. compared to CSC-HVDC. Therefore, the CSC-HVDC and the VSC-HVDC can be combined to carry out VSC transformation on the existing high-voltage direct-current power transmission receiving end CSC, thereby forming CSC-VSC mixed direct-current power transmission and effectively improving the flexibility and the voltage stability of the receiving end power grid.
For a hybrid direct current transmission system adopting a CSC-D-VSC topological structure, a high-power current limiting diode valve bank is arranged at a receiving end VSC converter station and is used for blocking a fault current path when a ground fault of a direct current polar line occurs, so that the fault handling capacity of the hybrid direct current transmission system is improved, but due to the existence of the current limiting diode, the operation overvoltage characteristic of equipment in the station is different from that of the converter station in a flexible direct current system at two ends, various faults in the converter station all cause the diode to be blocked by reverse voltage, the electromagnetic transient process of the system is greatly influenced after the fault, and the configuration scheme of an original flexible direct current converter station lightning arrester is difficult to meet the requirements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the converter station of the receiving-end voltage source converter of the hybrid direct-current transmission system, which aims to ensure that a lightning arrester accurately protects key equipment in the converter station, ensures that overvoltage level of each equipment in the converter station can meet insulation requirements, and has important application value for improving safety performance and optimizing design level of the converter station of the receiving-end voltage source converter of the hybrid direct-current transmission system.
In order to achieve the above object, there is provided a method for constructing a voltage source converter station at a receiving end of a hybrid direct current transmission system, wherein a system transmitting end is a conventional direct current converter station, a system receiving end is a voltage source converter station, and the system receiving end voltage source converter station includes: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the method comprises the following steps: the method comprises the steps of carrying out a first treatment on the surface of the
The connecting transformer is respectively connected with an upper bridge arm reactor and a lower bridge arm reactor, one end of an upper bridge arm converter valve is connected with the upper bridge arm reactor, and the other end is connected with an electrode wire current limiting reactor;
connecting the other end of the polar line current limiting reactor to a direct current polar line, connecting one end of a lower bridge arm converter valve with the lower bridge arm reactor, and connecting the other end of the lower bridge arm converter valve to the anode of the current limiting diode;
connecting the cathode of the current-limiting diode to a neutral line current-limiting reactor;
and the other end of the neutral line current limiting reactor is connected to a grounding line or a metal return line.
The three-phase alternating current bus arrester comprises an alternating current bus arrester A, a bridge arm reactor valve side arrester LV, a valve top arrester CBH, a limiting reactor end arrester DR, a direct current pole arrester DL, a neutral bus arrester CBN1, a diode end arrester DA, a limiting diode and a grounding pole arrester EL, wherein the alternating current bus arrester A is connected to an alternating current bus side of a connection transformer, the connection variable valve side arrester AV is connected to a converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to converter valve sides of an upper bridge arm reactor and a lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line limiting reactor, the limiting reactor end arrester DR is connected to two ends of the polar line limiting reactor, the direct current pole arrester DL is connected between the polar line limiting reactor and the direct current pole, the neutral bus arrester CBN1 in a valve hall is connected between the lower bridge arm converter valve and the limiting diode, the diode end arrester DA is connected to two ends of the limiting diode, the neutral bus arrester CBN2 is connected between the limiting diode and the grounding pole line limiting reactor.
The rated voltage of the diode-end arrester DA is 396kV, the operation impact protection level of the diode-end arrester DA is 565kV, and the number of the diode-end arrester DA arrester columns is 8 columns.
The rated voltage of the pole line current limiting reactor end arrester DR is 629kV, the operation impact protection level of the pole line current limiting reactor end arrester DR is 904kV, and the pole number of the pole line current limiting reactor end arrester DR arrester is 4 poles.
The rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 is 8 columns.
The lightning arrester is composed of a silicone rubber group sleeve, a metal end, a zinc oxide valve plate, a polymer filling material, an epoxy glass fiber reinforced plastic core rod, a hanging ring, an epoxy glass fiber reinforced plastic cylinder and a flange.
The sub-modules are components of the bridge arms of the converter valve, and each bridge arm comprises a plurality of sub-modules.
The valve top lightning arrester CBH is connected between the valve top and the ground.
The LV is connected between the valve side of the bridge arm reactor and the ground wire.
The alternating current bus arrester A is connected between the alternating current bus and the ground wire, and the connecting variable valve side arrester AV is connected between the connecting variable valve side and the ground.
According to another aspect of the present invention, there is provided a hybrid direct current transmission system receiver-side voltage source converter station, characterized in that the converter station comprises: the system send end is conventional direct current converter station, and the system receiving end is voltage source converter station, the system receiving end voltage source converter station includes: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the connecting transformer is respectively connected with the upper bridge arm reactor and the lower bridge arm reactor, one end of the upper bridge arm converter valve is connected with the upper bridge arm reactor, the other end of the upper bridge arm converter valve is connected with the polar line current limiting reactor, the other end of the polar line current limiting reactor is connected to the direct current polar line, one end of the lower bridge arm converter valve is connected with the lower bridge arm reactor, the other end of the lower bridge arm converter valve is connected to the positive electrode of the current limiting diode, the negative electrode of the current limiting diode is connected to the neutral line current limiting reactor, and the other end of the neutral line current limiting reactor is connected to the grounding polar line or the metal loop.
The alternating current bus arrester A is connected to the alternating current bus side of the connection transformer, the connection change valve side arrester AV is connected to the converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to the converter valve sides of the upper bridge arm reactor and the lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line current limiting reactor, the current limiting reactor end arrester DR is connected to two ends of the polar line current limiting reactor, the direct current polar arrester DL is connected between the polar line current limiting reactor and the direct current polar line, the neutral bus arrester CBN1 in the valve hall is connected between the lower bridge arm converter valve and the current limiting diode, the diode end arrester DA is connected to two ends of the current limiting diode, the neutral bus arrester CBN2 outside the valve hall is connected between the current limiting diode and the neutral line current limiting reactor, and the ground electrode arrester EL is connected between the neutral line current limiting reactor and the ground electrode line.
The DA operation impact protection level of the diode-end arrester is 565kV, and the number of the poles of the diode-end arrester DA is 8.
The rated voltage of the pole line current limiting reactor end arrester DR is 629kV, the operation impact protection level of the pole line current limiting reactor end arrester DR is 904kV, and the pole number of the pole line current limiting reactor end arrester DR arrester is 4 poles.
The rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 is 8 columns.
The lightning arrester is composed of a silicone rubber group sleeve, a metal end, a zinc oxide valve plate, a polymer filling material, an epoxy glass fiber reinforced plastic core rod, a hanging ring, an epoxy glass fiber reinforced plastic cylinder and a flange.
The method is characterized in that the submodules are component parts of bridge arms of the converter valve, and each bridge arm comprises a plurality of submodules.
The valve top lightning arrester CBH is connected between the valve top and the ground.
The LV is connected between the valve side of the bridge arm reactor and the ground wire.
The alternating current bus arrester A is connected between the alternating current bus and the ground wire, and the connecting variable valve side arrester AV is connected between the connecting variable valve side and the ground.
The invention adopts the following converter equipment of the receiving end voltage source converter of the hybrid direct current transmission system:
the method is characterized in that the rated voltage of the diode-end arresters DA is 396kV, and the operating impact protection level of the diode-end arresters DA is 565kV;
the method is characterized in that the rated voltage of the pole line current limiting reactor end lightning arrester DR is 629kV, and the operation impact protection level of the pole line current limiting reactor end lightning arrester DR is 904kV;
the method is characterized in that a neutral bus arrester CBN1 in a valve hall is installed at the side of a neutral line valve, the number of columns of the neutral bus arrester CBN1 in the valve hall is 8, one end of the neutral bus arrester CBN1 in the valve hall is connected with an arrester DA between diode ends, the other end of the neutral bus arrester CBN1 is connected with a bridge arm reactor, and the bridge arm reactor is used for improving the through-flow energy of the arrester, and the method is characterized in that rated voltage of the neutral line valve arrester CBN1 is 428kV, and the operation impact protection level of the neutral line valve arrester CBN1 is 652kV;
technical effects
According to the technical scheme, the lightning arrester accurately protects key equipment in the converter station, the overvoltage level of each equipment in the converter station can meet insulation requirements, when the two ends of the diode bear transient overvoltage with higher assignment, the lightning arrester DA between the diode ends can protect insulation between the current-limiting diode ends, when a plurality of faults cause serious overvoltage on the neutral line valve side, and the overvoltage duration is longer, the number of columns of the lightning arrester CBN1 on the neutral line valve side is increased, the through-flow energy of the lightning arrester is improved, when overvoltage peaks with higher amplitude are generated at the two ends of the polar current-limiting reactor, the lightning arrester DR between the reactor ends is used for protecting the overvoltage at the two ends of the current-limiting reactor, and meanwhile lightning invasion wave protection of the current-limiting reactor can be considered.
Drawings
Example embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic diagram of an optimized arrangement of lightning arresters in a receiving-side voltage source converter station according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The traditional direct current transmission, also called current source converter high voltage direct current transmission CSC-HVDC, has obvious drawbacks, mainly expressed by: the method is completely dependent on the operation of an alternating current power grid, has the problem of commutation failure, and lacks operation independence. The voltage source converter high-voltage direct-current transmission VSC-HVDC based on the fully-controlled device can exactly make up the main defects of the current source converter high-voltage direct-current transmission, and the voltage source converter high-voltage direct-current transmission has the main advantages that: independent of the AC power grid operation, no commutation failure problem exists, no or only a small amount of reactive compensation equipment is needed, and the active power and the reactive power can be operated in four quadrants. The defects are mainly that the capacity and the voltage level are still smaller, the operation loss is larger, and the like. Therefore, VSC transformation is performed on the existing high-voltage direct-current transmission receiving end CSC to form CSC-VSC hybrid direct-current transmission, so that the flexibility and voltage stability of a receiving end power grid are effectively improved, but due to the existence of a current-limiting diode, the operation overvoltage characteristic of equipment in a station is different from that of a converter station in a flexible direct-current system at two ends, various faults in the converter station all cause that the diode is blocked due to the fact that the diode receives reverse voltage, the electromagnetic transient process of the system after the faults is greatly influenced, and the configuration scheme of an original flexible direct-current converter station lightning arrester is difficult to meet the requirements.
The invention provides a receiving end voltage source converter station of a hybrid direct current transmission system. According to the operation overvoltage characteristics of the receiving end voltage source converter station after the current-limiting diode is adopted, an optimal configuration scheme of the arrangement and parameters of a lightning arrester of the converter station is provided, so that the lightning arrester can accurately protect key equipment in the converter station, the overvoltage level of each equipment in the converter station can be ensured to meet the insulation requirement, and the method has important application value for improving the safety performance and the optimal design level of the receiving end voltage source converter station of the hybrid direct current transmission system.
Referring to fig. 1, the receiving end voltage source converter station of the hybrid direct current transmission system according to the embodiment of the invention is divided into two parts, wherein the upper part is from a positive electrode line to a grounding electrode line, the lower part is from a negative electrode line to the grounding electrode line, and the receiving end voltage source converter station of the system comprises: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the upper half part of the connection transformer of the voltage source converter station at the receiving end of the hybrid direct current transmission system is respectively connected with an upper bridge arm reactor and a lower bridge arm reactor, one end of the upper bridge arm converter valve is connected with the upper bridge arm reactor, the other end of the upper bridge arm converter valve is connected with the polar line current limiting reactor, the other end of the polar line current limiting reactor is connected to a direct current polar line, one end of the lower bridge arm converter valve is connected with the lower bridge arm reactor, the other end of the lower bridge arm converter valve is connected to the positive electrode of a current limiting diode, the negative electrode of the current limiting diode is connected to a neutral line current limiting reactor, and the other end of the neutral line current limiting reactor is connected to a grounding polar line or a metal loop.
The lower half part of the connecting transformer of the receiving end voltage source converter station of the hybrid direct current transmission system is respectively connected with an upper bridge arm reactor and a lower bridge arm reactor, one end of the upper bridge arm converter valve is connected with the upper bridge arm reactor, the other end of the upper bridge arm converter valve is connected with the polar line current limiting reactor, the other end of the polar line current limiting reactor is connected to a direct current polar line, one end of the lower bridge arm converter valve is connected with the lower bridge arm reactor, the other end of the lower bridge arm converter valve is connected to the positive electrode of a current limiting diode, the negative electrode of the current limiting diode is connected to a neutral line current limiting reactor, and the other end of the neutral line current limiting reactor is connected to a grounding polar line or a metal loop.
The alternating current bus arrester A is connected to the alternating current bus side of the connection transformer, the connection change valve side arrester AV is connected to the converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to the converter valve sides of the upper bridge arm reactor and the lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line current limiting reactor, the current limiting reactor end arrester DR is connected to two ends of the polar line current limiting reactor, the direct current polar arrester DL is connected between the polar line current limiting reactor and the direct current polar line, the neutral bus arrester CBN1 in the valve hall is connected between the lower bridge arm converter valve and the current limiting diode, the diode end arrester DA is connected to two ends of the current limiting diode, the neutral bus arrester CBN2 outside the valve hall is connected between the current limiting diode and the neutral line current limiting reactor, and the ground electrode arrester EL is connected between the neutral line current limiting reactor and the ground electrode line.
According to the primary analysis of the overvoltage of the operation of the receiving end voltage source converter station of the hybrid direct current transmission system, an optimized lightning arrester arrangement scheme is provided.
When a single-pole ground fault occurs on the direct-current polar line side of the hybrid direct-current transmission system, a current-limiting diode on the neutral line of a voltage source converter station at a receiving end is blocked by reverse voltage drop, and two ends of the diode bear transient overvoltage with higher amplitude, so that the lightning arrester DA is additionally arranged at two ends of the current-limiting diode, as shown in figure 1, and is used for protecting insulation among the ends of the current-limiting diode.
The current-limiting diode of the receiving-end voltage source converter station is arranged on a neutral line, the valve side of the neutral line is most susceptible to the effect of overvoltage of the receiving end, various faults can lead the valve side of the neutral line to bear serious overvoltage, and the duration of the overvoltage is long, so that the number of columns of the lightning arrester CBN1 on the valve side of the neutral line is increased, and the through-flow energy of the lightning arrester is improved.
The grounding fault of the valve top of the receiving-end voltage source converter station can generate overvoltage peaks with higher amplitude at the two ends of the polar current-limiting reactor, so that the protection of overvoltage at the two ends of the current-limiting reactor is suggested to be enhanced, and the lightning arrester DR between the installation ends is shown in fig. 1, and meanwhile, the lightning invasion wave protection of the current-limiting reactor can be considered.
And (3) building an electromagnetic transient simulation model of a typical hybrid direct current transmission system, and obtaining the operation overvoltage level of key equipment of the receiving-end voltage source converter station through simulation analysis.
Under the lightning arrester arrangement scheme shown in fig. 1, fault scanning is performed on a receiving-end voltage source converter station, and the maximum value of the operation overvoltage at the two ends of a current limiting diode, the two ends of a polar current limiting reactor and the valve side of a neutral line and the maximum impulse discharge current of the corresponding lightning arrester are obtained as shown in table 1.
TABLE 1 operating overvoltage level at the critical position of a terminal voltage source converter station and lightning arrester surge discharge current
According to the analysis of the overvoltage characteristics of the operation of the receiving end voltage source converter station, a parameter optimization configuration scheme of the lightning arresters DA, DR and CBN1 is provided
(1) According to simulation analysis, the obtained key node operation overvoltage level of the receiving end voltage source converter station and the maximum impulse discharge current of the lightning arrester, and the main parameters of the lightning arresters DA, DR and CBN1 are presented as shown in table 2.
(2) The protection level of the arrester DA between the ends of the current-limiting diode is repeatedly iterated according to the operation overvoltage simulation calculation to obtain the operation impact protection level SIPL to obtain 565kV, and the number of recommended columns is 8 columns considering the problem of energy accumulation due to longer overvoltage duration.
(3) The lightning arrester DR between the polar current limiting reactors needs to simultaneously consider the protection of operation impulse and lightning invasion waves, and the lightning invasion wave overvoltage level is considered on the basis of the operation overvoltage level in parameter selection, namely the recommended number of columns is 4.
(4) The selection of the parameters of the neutral line valve side lightning arrester CBN1 refers to the parameters of the lightning arresters at the corresponding positions of the two-end flexible direct current converter stations, but in consideration of longer operation overvoltage bearing time of the neutral line valve side of the receiving end voltage source converter station in the hybrid direct current transmission system, it is proposed to increase the number of columns of CBN1, namely, recommended column number is 8 columns.
Table 2 key node arrester main parameters
The invention also provides a method for constructing the voltage source converter station of the receiving end of the hybrid direct current transmission system, which is characterized in that the system transmitting end is a conventional direct current converter station, the system receiving end is a voltage source converter station, and the system receiving end voltage source converter station comprises: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor; the method comprises the following steps: the connecting transformer is respectively connected with an upper bridge arm reactor and a lower bridge arm reactor, one end of an upper bridge arm converter valve is connected with the upper bridge arm reactor, and the other end is connected with an electrode wire current limiting reactor;
connecting the other end of the polar line current limiting reactor to a direct current polar line, connecting one end of a lower bridge arm converter valve with the lower bridge arm reactor, and connecting the other end of the lower bridge arm converter valve to the anode of the current limiting diode;
connecting the cathode of the current-limiting diode to a neutral line current-limiting reactor;
and the other end of the neutral line current limiting reactor is connected to a grounding line or a metal return line.
The three-phase alternating current bus arrester comprises an alternating current bus arrester A, a bridge arm reactor valve side arrester LV, a valve top arrester CBH, a limiting reactor end arrester DR, a direct current pole arrester DL, a neutral bus arrester CBN1, a diode end arrester DA, a limiting diode and a grounding pole arrester EL, wherein the alternating current bus arrester A is connected to an alternating current bus side of a connection transformer, the connection variable valve side arrester AV is connected to a converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to converter valve sides of an upper bridge arm reactor and a lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line limiting reactor, the limiting reactor end arrester DR is connected to two ends of the polar line limiting reactor, the direct current pole arrester DL is connected between the polar line limiting reactor and the direct current pole, the neutral bus arrester CBN1 in a valve hall is connected between the lower bridge arm converter valve and the limiting diode, the diode end arrester DA is connected to two ends of the limiting diode, the neutral bus arrester CBN2 is connected between the limiting diode and the grounding pole line limiting reactor.
The rated voltage of the diode-end arrester DA is 396kV, the operation impact protection level of the diode-end arrester DA is 565kV, and the number of the diode-end arrester DA arrester columns is 8 columns.
The rated voltage of the pole line current limiting reactor end arrester DR is 629kV, the operation impact protection level of the pole line current limiting reactor end arrester DR is 904kV, and the pole number of the pole line current limiting reactor end arrester DR arrester is 4 poles.
The rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 is 8 columns.
The lightning arrester is composed of a silicone rubber group sleeve, a metal end, a zinc oxide valve plate, a polymer filling material, an epoxy glass fiber reinforced plastic core rod, a hanging ring, an epoxy glass fiber reinforced plastic cylinder and a flange.
The sub-modules are components of the bridge arms of the converter valve, and each bridge arm comprises a plurality of sub-modules.
The valve top lightning arrester CBH is connected between the valve top and the ground.
The LV is connected between the valve side of the bridge arm reactor and the ground wire.
The alternating current bus arrester A is connected between the alternating current bus and the ground wire, and the connecting variable valve side arrester AV is connected between the connecting variable valve side and the ground.
The invention also provides a receiving end voltage source converter station of the hybrid direct current transmission system, which is characterized by comprising: the system send end is conventional direct current converter station, and the system receiving end is voltage source converter station, the system receiving end voltage source converter station includes: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the connecting transformer is respectively connected with the upper bridge arm reactor and the lower bridge arm reactor, one end of the upper bridge arm converter valve is connected with the upper bridge arm reactor, the other end of the upper bridge arm converter valve is connected with the polar line current limiting reactor, the other end of the polar line current limiting reactor is connected to the direct current polar line, one end of the lower bridge arm converter valve is connected with the lower bridge arm reactor, the other end of the lower bridge arm converter valve is connected to the positive electrode of the current limiting diode, the negative electrode of the current limiting diode is connected to the neutral line current limiting reactor, and the other end of the neutral line current limiting reactor is connected to the grounding polar line or the metal loop.
The alternating current bus arrester A is connected to the alternating current bus side of the connection transformer, the connection change valve side arrester AV is connected to the converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to the converter valve sides of the upper bridge arm reactor and the lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line current limiting reactor, the current limiting reactor end arrester DR is connected to two ends of the polar line current limiting reactor, the direct current polar arrester DL is connected between the polar line current limiting reactor and the direct current polar line, the neutral bus arrester CBN1 in the valve hall is connected between the lower bridge arm converter valve and the current limiting diode, the diode end arrester DA is connected to two ends of the current limiting diode, the neutral bus arrester CBN2 outside the valve hall is connected between the current limiting diode and the neutral line current limiting reactor, and the ground electrode arrester EL is connected between the neutral line current limiting reactor and the ground electrode line.
The DA operation impact protection level of the diode-end arrester is 565kV, and the number of the poles of the diode-end arrester DA is 8.
The rated voltage of the pole line current limiting reactor end arrester DR is 629kV, the operation impact protection level of the pole line current limiting reactor end arrester DR is 904kV, and the pole number of the pole line current limiting reactor end arrester DR arrester is 4 poles.
The rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 is 8 columns.
The lightning arrester is composed of a silicone rubber group sleeve, a metal end, a zinc oxide valve plate, a polymer filling material, an epoxy glass fiber reinforced plastic core rod, a hanging ring, an epoxy glass fiber reinforced plastic cylinder and a flange.
The method is characterized in that the submodules are component parts of bridge arms of the converter valve, and each bridge arm comprises a plurality of submodules.
The valve top lightning arrester CBH is connected between the valve top and the ground.
The LV is connected between the valve side of the bridge arm reactor and the ground wire.
The alternating current bus arrester A is connected between the alternating current bus and the ground wire, and the connecting variable valve side arrester AV is connected between the connecting variable valve side and the ground.
According to the technical scheme, the lightning arrester accurately protects key equipment in the converter station, the overvoltage level of each equipment in the converter station can meet insulation requirements, when the two ends of the diode bear transient overvoltage with higher assignment, the lightning arrester DA between the diode ends can protect insulation between the current-limiting diode ends, when a plurality of faults cause serious overvoltage on the neutral line valve side, and the overvoltage duration is longer, the number of columns of the lightning arrester CBN1 on the neutral line valve side is increased, the through-flow energy of the lightning arrester is improved, when overvoltage peaks with higher amplitude are generated at the two ends of the polar current-limiting reactor, the lightning arrester DR between the reactor ends is used for protecting the overvoltage at the two ends of the current-limiting reactor, and meanwhile lightning invasion wave protection of the current-limiting reactor can be considered.
Claims (8)
1. A method for constructing a hybrid direct current transmission system receiver voltage source converter station, characterized in that the system transmitter is a conventional direct current converter station and the system receiver is a voltage source converter station, the system receiver voltage source converter station comprising: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the method comprises the following steps:
the connecting transformer is respectively connected with an upper bridge arm reactor and a lower bridge arm reactor, one end of an upper bridge arm converter valve is connected with the upper bridge arm reactor, and the other end is connected with an electrode wire current limiting reactor;
connecting the other end of the polar line current limiting reactor to a direct current polar line, connecting one end of a lower bridge arm converter valve with the lower bridge arm reactor, and connecting the other end of the lower bridge arm converter valve to the anode of the current limiting diode;
connecting the cathode of the current-limiting diode to a neutral line current-limiting reactor;
the other end of the neutral line current limiting reactor is connected to a grounding line or a metal return line;
an alternating current bus arrester A is connected to an alternating current bus side of a connection transformer, a connection variable valve arrester AV is connected to a converter valve side of the connection transformer, bridge arm reactor valve side arresters LV are respectively connected to converter valve sides of an upper bridge arm reactor and a lower bridge arm reactor, a valve top arrestor CBH is connected between the upper bridge arm converter valve and an electrode wire current limiting reactor, a current limiting reactor end arrestor DR is connected to two ends of the electrode wire current limiting reactor, a direct current electrode arrester DL is connected between the electrode wire current limiting reactor and the direct current electrode wire, a neutral bus arrester CBN1 in a valve hall is connected between the lower bridge arm converter valve and the current limiting diode, a diode end arrestor DA is connected to two ends of the current limiting diode, a neutral bus arrester CBN2 outside the valve hall is connected between the current limiting diode and the neutral wire current limiting reactor, and a ground electrode wire arrester EL is connected between the neutral wire current limiting reactor and the ground electrode wire.
2. The method according to claim 1, characterized in that the diode-side arrester DA rated voltage is 396kV, the diode-side arrester DA operation surge protection level is 565kV, and the number of diode-side arrester DA arrester columns is 8 columns.
3. The method according to claim 1, wherein the rated voltage of the pole-line current-limiting reactor-end arrester DR is 629kV, the operating surge protection level of the pole-line current-limiting reactor-end arrester DR is 904kV, and the number of poles of the pole-line current-limiting reactor-end arrester DR is 4 poles.
4. The method according to claim 1, wherein the rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of columns of the neutral line valve side arrester CBN1 arrester is 8 columns.
5. A hybrid direct current transmission system receiver-side voltage source converter station, the converter station comprising: the system send end is conventional direct current converter station, and the system receiving end is voltage source converter station, the system receiving end voltage source converter station includes: the high-power current-limiting diode valve bank, the connecting transformer, the upper bridge arm reactor, the lower bridge arm reactor, the upper bridge arm converter valve, the lower bridge arm converter valve, the polar current-limiting reactor, the current-limiting diode and the neutral line current-limiting reactor;
the connecting transformer is respectively connected with the upper bridge arm reactor and the lower bridge arm reactor, one end of the upper bridge arm converter valve is connected with the upper bridge arm reactor, the other end of the upper bridge arm converter valve is connected with the polar line current limiting reactor, the other end of the polar line current limiting reactor is connected to the direct current polar line, one end of the lower bridge arm converter valve is connected with the lower bridge arm reactor, the other end of the lower bridge arm converter valve is connected to the positive electrode of the current limiting diode, the negative electrode of the current limiting diode is connected to the neutral line current limiting reactor, and the other end of the neutral line current limiting reactor is connected to the grounding polar line or the metal loop; the alternating current bus arrester A is connected to the alternating current bus side of the connection transformer, the connection change valve side arrester AV is connected to the converter valve side of the connection transformer, the bridge arm reactor valve side arrester LV is respectively connected to the converter valve sides of the upper bridge arm reactor and the lower bridge arm reactor, the valve top arrester CBH is connected between the upper bridge arm converter valve and the polar line current limiting reactor, the current limiting reactor end arrester DR is connected to two ends of the polar line current limiting reactor, the direct current polar arrester DL is connected between the polar line current limiting reactor and the direct current polar line, the neutral bus arrester CBN1 in the valve hall is connected between the lower bridge arm converter valve and the current limiting diode, the diode end arrester DA is connected to two ends of the current limiting diode, the neutral bus arrester CBN2 outside the valve hall is connected between the current limiting diode and the neutral line current limiting reactor, and the ground electrode arrester EL is connected between the neutral line current limiting reactor and the ground electrode line.
6. The terminal voltage source converter station of a hybrid direct current transmission system according to claim 5, wherein the rated voltage of the inter-diode arrester DA is 396kV, the operating surge protection level of the inter-diode arrester DA is 565kV, and the number of the inter-diode-terminal arrester DA arrester poles is 8 poles.
7. The voltage source converter station at the receiving end of the hybrid direct current transmission system according to claim 5, wherein the rated voltage of the lightning arrester DR between the pole line current limiting reactor ends is 629kV, the operation surge protection level of the lightning arrester DR between the pole line current limiting reactor ends is 904kV, and the number of poles of the lightning arrester DR between the pole line current limiting reactor ends is 4 poles.
8. The hybrid direct current transmission system receiver-side voltage source converter station according to claim 5, characterized in that the rated voltage of the neutral line valve side arrester CBN1 is 428kV, the operating surge protection level of the neutral line valve side arrester CBN1 is 652kV, and the number of poles of the neutral line valve side arrester CBN1 is 8 poles.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106385047A (en) * | 2016-11-18 | 2017-02-08 | 中国能源建设集团广东省电力设计研究院有限公司 | Full-bridge topological bipolar wiring flexible DC converter station and neutral line wiring apparatus thereof |
| CN106532757A (en) * | 2016-11-17 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Bipolar flexible DC power transmission system, converter station thereof and control method of converter station |
| CN109086477A (en) * | 2018-06-20 | 2018-12-25 | 中国电力科学研究院有限公司 | A kind of method and apparatus in VSC DC converter station protection Lightning Incoming Wave |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532757A (en) * | 2016-11-17 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Bipolar flexible DC power transmission system, converter station thereof and control method of converter station |
| CN106385047A (en) * | 2016-11-18 | 2017-02-08 | 中国能源建设集团广东省电力设计研究院有限公司 | Full-bridge topological bipolar wiring flexible DC converter station and neutral line wiring apparatus thereof |
| CN109086477A (en) * | 2018-06-20 | 2018-12-25 | 中国电力科学研究院有限公司 | A kind of method and apparatus in VSC DC converter station protection Lightning Incoming Wave |
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