CN116154494A - Cable domain-division same-side grounding method for flexible traction power supply system - Google Patents
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Abstract
The invention relates to the technical field of traction power supply, and provides a split-domain same-side grounding method for a cable of a flexible traction power supply system, wherein the flexible traction power supply system is divided into an input domain, a serial reactance domain and an output domain, a primary side outgoing cable A and an incoming cable X of an input transformer are laid in pairs, and the primary side cable grounding method of the input transformer comprises the following steps: connecting a shielding layer of a primary-side outgoing cable A of the input transformer to one point of a primary-side cable bracket of the input transformer; connecting a shielding layer of the primary-side incoming cable X of the input transformer to another point of the primary-side cable support of the input transformer; and (3) carrying out single-point grounding on the primary side cable support of the input transformer and the ground. Through the technical scheme, the problem that the grounding current of the flexible traction power supply system is large in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of traction power supply, in particular to a cable split-domain same-side grounding method of a flexible traction power supply system.
Background
With the rapid development of semiconductor technology, high-power electronic devices are widely applied to the field of power transmission and distribution of power systems in China. Meanwhile, the development of the electrified railway for the rail transit is promoted by a power electronic technology, and the electric energy quality problem of a traction power supply system of the railway is especially faced. If a conventional traction power supply system causes power quality pollution in the running process of an electrified railway, three-phase unbalance is caused, the capacity utilization rate of a traction transformer is low, the limitation of single-side power supply is caused, land resource waste is caused, and a plurality of subareas are built. The flexible AC traction power supply system is electrified and isolated from the railway system and the national network power system, so that the electric energy quality is improved, the electric split phase is eliminated, the utilization rate of traction equipment is improved, and the reliability of the electrified railway traction power supply system is improved by using bilateral power supply.
The traditional traction power supply system mainly aims at single-phase three-phase power cables, the number of the cables is small, the density of cable interlayers is low, the cables are basically fundamental frequency current signals, the grounding of a cable shielding layer is not required to be uniform, and the construction specifications of single-point grounding, double-point grounding and the like can be met when the power cable shielding grounding construction is carried out. The current transformer in the flexible AC traction power supply system is accompanied with high-frequency switch signals in the operation process of rectification inversion, and the number of cables is large, so that the grounding environment resistance is different due to different construction processes of various workers in the actual construction process, or the situation that the grounding current occurs in a cable shielding layer through other factors such as complex electromagnetic environment often occurs, and the series of problems such as heating of the grounding system of the traction power supply station are caused.
Disclosure of Invention
The invention provides a cable domain-division same-side grounding method of a flexible traction power supply system, which solves the problem of high grounding current of the flexible traction power supply system in the related art.
The technical scheme of the invention is as follows:
the utility model provides a flexible traction power supply system cable divides domain homonymy ground connection method, flexible traction power supply system divide into input domain, cluster anti domain and output domain, the cable of input domain includes the cable between input switch cabinet and the primary side of input transformer, and the cable between the secondary side of input transformer and series reactor, the valve tower, the cable of cluster anti domain includes the cable between series reactor and the valve tower converter, the cable of output domain includes the cable between valve tower converter and the primary side of output transformer, and the cable between secondary side of output transformer and branch reflow box, the primary side of input transformer is qualified for the next round of competitions cable A and inlet wire cable X and is laid in pairs, the cable ground connection method of input transformer primary side includes:
connecting a shielding layer of a primary-side outgoing cable A of the input transformer to one point of a primary-side cable bracket of the input transformer;
connecting a shielding layer of the primary-side incoming cable X of the input transformer to another point of the primary-side cable support of the input transformer;
and (3) carrying out single-point grounding on the primary side cable support of the input transformer and the ground.
Further, the input transformer is a single-phase input n split output transformer, the secondary side of the input transformer is connected with the series reactor through n pairs of outgoing cables A, the secondary side of the input transformer is connected with the valve tower converter through n pairs of incoming cables X, and the cable grounding method of the secondary side of the input transformer comprises the following steps:
each pair of outgoing cables A and the incoming cable X of the same loop are respectively connected to the same point of the secondary side cable bracket of the input transformer, and the shielding layers of the outgoing cables A connected with different split outputs are connected to different points of the secondary side cable bracket of the input transformer;
the secondary side cable support of the input transformer is grounded in a single point with the ground.
Further, the primary side outgoing cable A and the incoming cable X of the input transformer are m parallel connection, and the grounding current of the cable between the input switch cabinet and the input transformer is as follows:
wherein ,
for the ground current of the primary outgoing cable A of the input transformer, < >>
The grounding currents of m outgoing cables A are respectively; />
For the input of the grounding current of the primary-side incoming cable X of the transformer, < >>
The grounding currents of m incoming cables X are respectively; />
The grounding current of the cable between the input switch cabinet and the input transformer;
the secondary side of the input transformer is connected with the series reactor through n pairs of outgoing cables A, the secondary side of the input transformer is connected with the valve tower converter through n pairs of incoming cables X, and the grounding current between the secondary side of the input transformer and the series reactor and between the secondary side of the input transformer and the valve tower is as follows:
wherein ,
for the input of the ground current of the secondary outlet cable A of the transformer, < >>
The grounding currents of the n outgoing cables A are respectively; />
For the input of the ground current of the secondary side incoming cable X of the transformer, < >>
The grounding currents of n incoming cables X are respectively; />
The grounding current between the secondary side of the input transformer and the series reactor and between the input transformer and the valve tower;
ground current of input domain
Further, the series reactor is of an upper-layer and lower-layer structure, outgoing cables A of the upper-layer series reactor and the lower-layer series reactor are laid in parallel, incoming cables X of the upper-layer series reactor and the lower-layer reactor are laid in parallel, 2 cables are adopted between each layer of series reactor and the valve tower converter in parallel, and cable shielding layers of the upper-layer series reactor and the lower-layer series reactor are grounded on the same side of a series reactor bracket.
Further, the series reactor is connected with k valve groups in the valve tower converter, and the grounding current of the cable between the series reactor and the valve tower converter is as follows:
wherein ,
the grounding current of the outlet cable A of the upper-layer series reactor and the lower-layer series reactor is equal to the grounding current of the outlet cable A of the lower-layer series reactor,
the ground currents of the k outgoing cables A are respectively; />
The grounding current of the incoming cable X for the upper-layer series reactor and the lower-layer series reactor, < +.>
The ground currents of k incoming cables X are respectively; />
Is the grounding current of the cable between the series reactor and the valve tower converter.
Further, the outgoing cable A and the incoming cable X of the primary side of the output transformer are laid in pairs, and the grounding method of the primary side cable of the output transformer comprises the following steps:
the outgoing cable A on the primary side of the output transformer is connected to the primary side cable bracket of the output transformer;
the incoming line cable X of the primary side of the output transformer is connected to a primary side cable bracket of the output transformer;
the primary side cable support of the output transformer is grounded in a single point with the ground.
Further, the outgoing cable A and the incoming cable X of the secondary side of the output transformer are laid in pairs, and the grounding method of the secondary side cable of the output transformer comprises the following steps:
the outgoing cable A of the secondary side of the output transformer is connected to the secondary side cable bracket of the output transformer;
the incoming cable X of the secondary side of the output transformer is connected to a secondary side cable support of the output transformer;
the secondary side cable support of the output transformer is grounded in a single point with the ground.
Further, the primary side outgoing cable A and the incoming cable X of the output transformer are connected in parallel, and the grounding current of the primary side cable of the output transformer is as follows:
wherein ,
for outputting the grounding current of the primary-side outgoing cable A of the transformer, < >>
The grounding currents of w outgoing cables A are respectively; />
For outputting transformersGround current of primary-side incoming cable X, < >>
The grounding currents of w incoming cables X are respectively; />
The grounding current of the primary side cable of the output transformer;
the output transformer secondary side outgoing cable A and the incoming cable X are connected in parallel, and the grounding current of the output transformer secondary side cable is as follows:
wherein ,
for outputting the grounding current of the secondary side outgoing cable A of the transformer, < >>
The grounding currents of w outgoing cables A are respectively; />
For outputting the grounding current of the secondary side incoming cable X of the transformer, < >>
The grounding currents of w incoming cables X are respectively; />
The secondary side cable of the transformer is grounded; />
Ground current of output domain
The working principle and the beneficial effects of the invention are as follows:
according to the invention, a split-domain same-side grounding method is adopted in the flexible traction power supply system, namely the outgoing cable A and the incoming cable X are respectively connected with the cable support, and then the cable support is grounded at a single point. Meanwhile, the mode of domain grounding is more beneficial to reducing the magnetic field intensity of the cable support, the heating value of the cable support is smaller, and the stability of the flexible traction power supply system is improved.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a traction power system of the present invention;
FIG. 2 is a schematic diagram of a primary side cable grounding method of an input transformer;
FIG. 3 is a schematic diagram of a secondary cable grounding method of an input transformer according to the present invention;
FIG. 4 is a schematic diagram of a method for grounding a series reactor cable according to the present invention;
FIG. 5 is a schematic diagram of a primary side grounding method of an output transformer according to the present invention;
fig. 6 is a schematic diagram of a secondary grounding method of an output transformer according to the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The main electrical equipment in the flexible AC traction power supply system comprises input switch cabinets 60GT and 70GT, an input transformer G1B, series reactors LK1-16, a valve tower converter SPCT and an output transformer G3B, and one traction station comprises 2 flexible AC traction power supply system devices. As shown in figure 1, the flexible traction power supply system is divided into an input domain, a valve tower domain and an output domain, and all the domains are connected by adopting a plurality of single-phase alternating current cables.
The number of cables in an interlayer in the flexible alternating current traction power supply system is large, the span length is long, and the cables are arranged in an optimal arrangement mode to be placed.
1. Input domain same side type grounding scheme
1.1 the input field of the flexible ac traction power supply system mainly comprises the cable between the input switch cabinet and the primary side of the input transformer, the cable between the secondary side of the input transformer and the series reactance and valve tower. In the flexible AC traction power supply system, an input switch cabinet is connected with the primary side of an input transformer in parallel through 3 27.5kV cables, AX is applied to the same support of the primary side of the input transformer in pairs for grounding, as shown in S1 in the attached drawing 1, so that the purpose of reducing the cable grounding current between the input switch cabinet and the input transformer is achieved, and the grounding section view of the primary side of the input transformer is shown in the attached drawing 2. According to the grounding method, the grounding current Isr1 from the input switch cabinet to the primary side of the input transformer is further obtained. Equation 2 is shown below:
1.2 in the flexible AC traction power supply system, the secondary side of the input transformer is connected with the series reactor through 16 pairs of cables with the first end being A polarity, the secondary side of the input transformer is connected with the valve tower converter through 16 pairs of cables with the terminal X polarity, the phase difference angle phi=180 DEG, the current frequency is mainly 50Hz, 2 18kV cables are connected in parallel, 64 cables are all arranged in pairs, the cables are symmetrically grounded on the same side of a cable bracket of the secondary side of the input transformer, as shown in S2 in the attached drawing 1, the grounding current between the secondary side of the input transformer, the series reactor and the valve tower is reduced, and the grounding section of the secondary side of the input transformer is shown in the attached drawing 3. According to the grounding method, a grounding current calculation formula between the secondary side of the input transformer and the series reactor and the valve tower is further obtained, and the grounding current Isr2 is assumed. Equation 3 is shown below:
further, the ground current Isr of the cable input field of the flexible ac traction power supply system, formula 4 is as follows:
2. same-side grounding scheme for serial reactance domain
The series reactors of the two SPCs in the flexible alternating current traction power supply system are all in the same room, wherein each SPC series reactor is connected with 16 valve groups in the valve tower converter, the series reactors are of an upper layer structure and a lower layer structure, the upper layer series reactor and the lower layer series reactor are arranged in pairs, 2 18kV cables are connected in parallel between the series reactor LK and the valve tower converter, the upper layer reactor cable and the lower layer reactor cable are grounded on the same side of a reactor bracket, as shown in S3 in the attached drawing 1, the cross section of the series reactor domain cable bracket is shown in the attached drawing 4, a grounding current calculation formula of a cable between the series reactor and the valve tower converter is further obtained according to the grounding method, and the grounding current Ick is assumed. Equation 5 is shown below:
3. output domain same side type grounding scheme
The inversion side of the valve tower converter in the flexible alternating current traction power supply system is connected with the primary side of the output transformer, and cables of the primary side of the output transformer are symmetrically grounded in an AX pair manner on a primary side bracket, as shown in S4 in the attached figure 1; the primary end A of the secondary side of the output transformer is connected with the filter device, the tail end X of the secondary side of the output transformer is connected with the branch reflux box in parallel through 3 27.5kV cables, the cables of the secondary side of the output transformer are symmetrically grounded in pairs AX on the secondary side support, as shown in S4 in the attached drawing 1, and the sectional views of the cable support of the primary side of the output transformer are shown in the attached drawing 5 and the attached drawing 6.
According to the grounding method, a grounding current calculation formula of the cable between the inversion side of the valve tower converter and the primary side of the output transformer is further obtained, and the grounding current Isc1 is assumed. Equation 6 is shown below:
according to the grounding method, an output variable secondary side and a filtering device are further obtained, a grounding current calculation formula between the output variable secondary side and the branch reflux box is assumed, and the grounding current Isc2 is assumed. Equation 7 is shown below:
further, the magnitude Isc of the ground current of the cable output domain of the flexible ac traction power supply system is shown in the following formula 8:
further, the magnitude of the cable grounding current of the whole flexible ac traction power supply system can be rapidly estimated, and the current Ig is assumed to be shown in formula 9:
according to the flexible traction power supply system, the grounding scheme of the shielding layers of the connecting cables between the input switch cabinet and the primary side of the input transformer, between the secondary side of the input transformer and the series reactor, between the secondary side of the input transformer and the valve tower, between the series reactor and the valve tower converter, between the valve tower converter and the primary side of the output transformer and between the secondary side of the output transformer and the output switch cabinet can be used for reducing the grounding current of the flexible traction power supply system, protecting cables among devices, improving the operation efficiency of the flexible traction power supply system and saving energy.
Meanwhile, according to the grounding method of the embodiment, a method capable of rapidly calculating the grounding current in the flexible traction power supply system is provided, and the sum of the grounding currents of the cable shielding layers of the whole traction power supply system is estimated efficiently.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The utility model provides a flexible traction power supply system cable divides domain homonymy ground connection method, flexible traction power supply system divide into input domain, cluster antigen domain and output domain, the cable of input domain includes the cable between input switch cabinet and the primary side of input transformer, and the cable between the secondary side of input transformer and series reactor, the valve tower, the cable of cluster antigen domain includes the cable between series reactor and the valve tower converter, the cable of output domain includes the cable between valve tower converter and the primary side of output transformer, and the cable between secondary side of output transformer and branch reflow box, the wave filter, its characterized in that, the primary side outgoing line cable A of input transformer and incoming line cable X lay in pairs, the cable ground connection method of input transformer primary side includes:
connecting a shielding layer of a primary-side outgoing cable A of the input transformer to one point of a primary-side cable bracket of the input transformer;
connecting a shielding layer of the primary-side incoming cable X of the input transformer to another point of the primary-side cable support of the input transformer;
and (3) carrying out single-point grounding on the primary side cable support of the input transformer and the ground.
2. The method for grounding a cable domain on the same side of a flexible traction power supply system according to claim 1, wherein the input transformer is a single-phase input n-split output transformer, the secondary side of the input transformer is connected with the series reactor through n pairs of outgoing cables a, the secondary side of the input transformer is connected with the valve tower converter through n pairs of incoming cables X, and the method for grounding the cable of the secondary side of the input transformer comprises:
each pair of outgoing cables A and the incoming cable X of the same loop are respectively connected to the same point of the secondary side cable bracket of the input transformer, and the shielding layers of the outgoing cables A connected with different split outputs are connected to different points of the secondary side cable bracket of the input transformer;
the secondary side cable support of the input transformer is grounded in a single point with the ground.
3. The method for the split-domain and same-side grounding of the cable of the flexible traction power supply system according to claim 1, wherein the primary outgoing cable A and the incoming cable X of the input transformer are m parallel connection cables, and the grounding current of the cable between the input switch cabinet and the input transformer is as follows:
wherein ,
for the ground current of the primary outgoing cable A of the input transformer, < >>
The grounding currents of m outgoing cables A are respectively; />
For the input of the grounding current of the primary-side incoming cable X of the transformer, < >>
The grounding currents of m incoming cables X are respectively; />
The grounding current of the cable between the input switch cabinet and the input transformer;
the secondary side of the input transformer is connected with the series reactor through n pairs of outgoing cables A, the secondary side of the input transformer is connected with the valve tower converter through n pairs of incoming cables X, and the grounding current between the secondary side of the input transformer and the series reactor and between the secondary side of the input transformer and the valve tower is as follows:
wherein ,
for the input of the ground current of the secondary outlet cable A of the transformer, < >>
The grounding currents of the n outgoing cables A are respectively; />
For the input of the ground current of the secondary side incoming cable X of the transformer, < >>
The grounding currents of n incoming cables X are respectively; />
The grounding current between the secondary side of the input transformer and the series reactor and between the input transformer and the valve tower;
ground current of input domain
4. The method for grounding the cable of the flexible traction power supply system on the same side in a split domain mode is characterized in that the series reactors are of an upper layer structure and a lower layer structure, outgoing cables A of the upper layer series reactors and outgoing cables A of the lower layer series reactors are laid in parallel, incoming cables X of the upper layer series reactors and the lower layer reactors are laid in parallel, 2 cables are connected in parallel between each layer of series reactors and the valve tower converter, and cable shielding layers of the upper layer series reactors and the lower layer series reactors are grounded on the same side of a series reactor bracket.
5. The method for domain-division and same-side grounding of a flexible traction power supply system cable according to claim 4, wherein the series reactor is connected with k valve groups in the valve tower converter, and the grounding current of the cable between the series reactor and the valve tower converter is as follows:
wherein ,
the earthing current of the outgoing cable A of the upper-layer series reactor and the lower-layer series reactor is +.>
The ground currents of the k outgoing cables A are respectively; />
The grounding current of the incoming cable X for the upper-layer series reactor and the lower-layer series reactor, < +.>
The ground currents of k incoming cables X are respectively; />
Is the grounding current of the cable between the series reactor and the valve tower converter.
6. The method for grounding a cable of a flexible traction power supply system on the same side in a split domain according to claim 1, wherein an outgoing cable a and an incoming cable X on the primary side of an output transformer are laid in pairs, and the method for grounding the cable on the primary side of the output transformer is as follows:
the outgoing cable A on the primary side of the output transformer is connected to the primary side cable bracket of the output transformer;
the incoming line cable X of the primary side of the output transformer is connected to a primary side cable bracket of the output transformer;
the primary side cable support of the output transformer is grounded in a single point with the ground.
7. The method for grounding a cable of a flexible traction power supply system on the same side in a split domain according to claim 1, wherein an outgoing cable a and an incoming cable X on a secondary side of an output transformer are laid in pairs, and the method for grounding the cable on the secondary side of the output transformer is as follows:
the outgoing cable A of the secondary side of the output transformer is connected to the secondary side cable bracket of the output transformer;
the incoming cable X of the secondary side of the output transformer is connected to a secondary side cable support of the output transformer;
the secondary side cable support of the output transformer is grounded in a single point with the ground.
8. The method for grounding a cable of a flexible traction power supply system on the same side in a split domain according to claim 1, wherein the primary outgoing cable a and the primary incoming cable X of the output transformer are connected in parallel, and the grounding current of the primary outgoing cable of the output transformer is as follows:
wherein ,
for outputting the grounding current of the primary-side outgoing cable A of the transformer, < >>
The grounding currents of w outgoing cables A are respectively; />
For outputting the grounding current of the primary-side incoming cable X of the transformer, < >>
The grounding currents of w incoming cables X are respectively; />
The grounding current of the primary side cable of the output transformer;
the output transformer secondary side outgoing cable A and the incoming cable X are connected in parallel, and the grounding current of the output transformer secondary side cable is as follows:
wherein ,
for outputting the grounding current of the secondary side outgoing cable A of the transformer, < >>
The grounding currents of w outgoing cables A are respectively; />
For outputting the grounding current of the secondary side incoming cable X of the transformer, < >>
Grounding of w incoming cables X respectivelyA current; />
The secondary side cable of the transformer is grounded;
ground current of output domain
/>
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| CN113002333A (en) * | 2021-03-24 | 2021-06-22 | 清华大学 | High-power converter grounding scheme of full-through type flexible alternating-current traction power supply system |
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