CN111682556B - Structure of in-phase power supply traction substation and compensation method thereof - Google Patents

Structure of in-phase power supply traction substation and compensation method thereof Download PDF

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CN111682556B
CN111682556B CN202010540799.9A CN202010540799A CN111682556B CN 111682556 B CN111682556 B CN 111682556B CN 202010540799 A CN202010540799 A CN 202010540799A CN 111682556 B CN111682556 B CN 111682556B
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traction
compensation
terminal
power
switching device
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CN111682556A (en
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解绍锋
张一鸣
李群湛
易东
黄小红
张丽艳
张丽
郭锴
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Southwest Jiaotong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1878—Arrangements for adjusting, eliminating or compensating reactive power in networks using tap changing or phase shifting transformers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Mechanical Engineering (AREA)
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Abstract

The invention discloses a structure of a same-phase power supply traction substation and a compensation method thereof, and relates to the technical field of power supply of electrified railways. The primary side of a traction-compensation transformer is connected with a three-phase high-voltage bus HB, the input end and the output end of a first high-power switching device SVG1 are respectively connected with the terminal a and the terminal c of a first compensation port on the secondary side of the traction-compensation transformer, the input end and the output end of a second high-power switching device SVG2 are respectively connected with the terminal c and the terminal b' of a second compensation port, the input end and the output end of a third high-power switching device SVG3 are respectively connected with the terminal a and the terminal d of a third compensation port, and a traction network is connected with a traction port ab; the comprehensive compensation measurement and control system comprises a voltage transformer, a current transformer and a controller, wherein the signal input end of the controller is respectively connected with the signal output ends of the voltage transformer and the current transformer, and the signal output end of the controller is connected with the control end of the comprehensive compensation equipment.

Description

Structure of in-phase power supply traction substation and compensation method thereof
Technical Field
The invention relates to the technical field of traction power supply of alternating current electrified railways, in particular to a reactive power and negative sequence comprehensive compensation technology for a same-phase power supply traction substation of an electrified railway.
Background
The electrified railway in China generally adopts a single-phase power frequency alternating current system, a traction load is essentially a single-phase power load, the single-phase power load has single-phase asymmetry, and the problem of electric energy quality mainly based on a negative sequence is generated in a three-phase power system. Therefore, the electrified railway usually adopts the schemes of phase-change connection and zone power supply of the traction transformer, and an electric phase splitting is arranged at the phase-splitting and zone power supply positions. Theories and practices show that the electric split phase is the weakest link in a traction power supply system, so that the electric split phase becomes a bottleneck for restricting the development of the traction power supply system of the electrified railway and the high-speed railway. In addition, the alternating-current and direct-current electric locomotives developed by adopting high-power fully-controlled devices such as IGBT and IGCT are widely applied to high-speed and heavy-load railways, the harmonic content is low, the power factor is approximate to 1, and the traction power is greatly improved compared with the alternating-current and direct-current electric locomotives, so that the problem of three-phase imbalance of a three-phase electric system caused by a high-power single-phase traction load is more prominent.
The concept of communicating with a same-phase power supply system is developed in order to completely eliminate electric split phase and simultaneously solve the problem of electric energy quality mainly based on a negative sequence generated by an electrified railway. By adopting a single-phase traction transformer in the traction substation and implementing bilateral power supply at the subareas, electric phase splitting at the outlet of the traction substation and between two adjacent power supply subareas is cancelled, and an in-phase compensation device is combined to comprehensively treat the electric energy quality problems such as negative sequence generated by a traction load, and finally realize full-line through in-phase power supply.
Disclosure of Invention
The invention aims to provide a structure of a traction substation with in-phase power supply, which can effectively solve the technical problem that traction power supply and compensation equipment share one transformer.
The invention also aims to provide a comprehensive compensation method for the in-phase power supply traction substation, which can effectively solve the technical problems of reducing the capacity of compensation equipment and simultaneously realizing real-time comprehensive compensation on reactive power and negative sequence generated by traction load of the electrified railway.
The purpose of the invention is realized by the following technical scheme: a structure of an in-phase power supply traction substation comprises a traction-compensation transformer TCT in a CSS of the in-phase power supply traction substation of an electrified railway, wherein the primary side of the traction-compensation transformer TCT is provided with two groups of windings which are marked as a first primary winding AB and a second primary winding BC, three terminals A, B, C are respectively led out and connected with a three-phase high-voltage bus HB, and the secondary side of the traction-compensation transformer TCT is provided with two groups of windings which are marked as a first secondary winding AB and a second secondary winding b' c; the relationship between the number of turns n of the first primary winding AB and the number of turns m of the second primary winding BC of the traction-compensating transformer TCT is: n is m; a first secondary winding ab of the traction-compensation transformer TCT is taken as a traction port, a tap d terminal is led out at the position of n ' of the number of turns of the winding by taking an a terminal of the first secondary winding ab as a reference, the tap d terminal is connected with a b ' terminal of a second secondary winding b ' c, and the number of turns of the second secondary winding b ' c is n '; wherein the values of n, m and n' are positive integers greater than 1; the first secondary winding ab and the second secondary winding b 'c respectively form an a terminal and a c terminal of a first compensation port, a c terminal and a b' terminal of a second compensation port and an a terminal and a d terminal of a third compensation port; the input end and the output end of a first high-power switch device SVG1 in the CCE are respectively connected with the terminal a and the terminal c of a first compensation port, the input end and the output end of a second high-power switch device SVG2 are respectively connected with the terminal c and the terminal b' of a second compensation port, and the input end and the output end of a third high-power switch device SVG3 are respectively connected with the terminal a and the terminal d of a third compensation port; the voltage transformer VT, the current transformer CT and the controller CD form a comprehensive compensation measurement and control system MCS, wherein the primary side of the voltage transformer VT is connected in parallel between the first secondary winding ab, the primary side of the current transformer CT is connected in series between the terminal a of the first secondary winding ab and the traction bus OCS, the signal input end of the controller CD is respectively connected with the measurement signal output ends of the voltage transformer VT and the current transformer CT, and the signal output end of the controller CD is connected with the control end of the comprehensive compensation equipment CCE.
If the power supply mode of the traction network is a direct power supply mode or a direct power supply mode with a return line, the terminal a of the first secondary winding ab of the traction-compensation transformer TCT is connected to the traction bus OCS, and the terminal b is connected with the steel rail R and the ground; and if the traction network power supply mode is an AT power supply mode, the terminal a of the first secondary winding ab of the traction-compensation transformer TCT is connected to the traction bus OCS, and the terminal b is connected with the negative feeder line F.
The other purpose of the invention is realized by the following technical scheme: a comprehensive compensation method for an in-phase power supply traction substation comprises the structure of the in-phase power supply traction substation, and comprises the following specific steps:
step one, taking the negative sequence allowance S of a three-phase high-voltage bus HBεAnd the power factor value mu is taken as a compensation target;
step two, calculating the voltage and current values measured by the voltage transformer VT and the current transformer CT through the controller CD of the comprehensive compensation measurement and control system MCS to obtain the traction load power SLAnd power factor
Figure GDA0003502945470000021
And thus judging the negative sequence power of the traction load
Figure GDA0003502945470000022
With negative sequence allowance SεThe relationship of (A), and the power factor
Figure GDA0003502945470000023
The relationship with the target power factor value μ is determined as follows:
(1) when in use
Figure GDA0003502945470000024
When, if
Figure GDA0003502945470000025
Then comprehensive compensation equipment CCE is put into to comprehensively compensate the negative sequence and the reactive power; if it is
Figure GDA0003502945470000026
The CCE only compensates the negative sequence;
(2) when in use
Figure GDA0003502945470000027
When, if
Figure GDA0003502945470000028
Then the CCE is put into the comprehensive compensation equipment to compensate the reactive power only; if it is
Figure GDA0003502945470000029
The CCE is in standby stateState.
The working time sequence of the power switch device when the CCE performs comprehensive compensation on the negative sequence and the reactive power is as follows: when in use
Figure GDA00035029454700000210
When the three-port compensation mode is adopted, a first high-power switching device SVG1, a second high-power switching device SVG2 and a third high-power switching device SVG3 are put into the three-port compensation mode; when in use
Figure GDA00035029454700000211
When, if
Figure GDA00035029454700000212
Only the third high-power switching device SVG3 is put into use, and the mode is simplified into a single-port compensation mode; if it is
Figure GDA00035029454700000213
The first high power switching device SVG1, the second high power switching device SVG2 and the third high power switching device SVG3 are all in standby state.
The three-port compensation mode has the following specific scheme:
(1) when in use
Figure GDA00035029454700000214
When, if
Figure GDA00035029454700000215
The reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG31、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure GDA00035029454700000216
Figure GDA00035029454700000217
wherein K is reactive compensation coefficient, the value range is more than 0 and less than or equal to 1, and the compensated power factor
Figure GDA00035029454700000218
The determination is made as to whether the user has selected,
Figure GDA00035029454700000219
when the traction load is in the traction condition, Q1Is inductive/capacitive, Q2Is capacitive/inductive, Q3For compatibility, Q is the time when the traction load is in the regenerative braking regime1Is capacitive/inductive, Q2Is inductive/capacitive, Q3Is perceptual;
(2) when in use
Figure GDA00035029454700000220
When, if
Figure GDA00035029454700000221
The reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG31、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure GDA0003502945470000031
when the traction load is in the traction condition, Q1、Q2And Q3Respectively inductive, capacitive and capacitive, Q being the value of the traction load when it is in the regenerative braking regime1、Q2And Q3Capacitive, inductive and inductive, respectively;
(3) when in use
Figure GDA0003502945470000032
When, if
Figure GDA0003502945470000033
Then the first high-power switching device SVG1 and the second high-power switching device SVG2 are in standby state at this time, and the reactive power Q emitted by the third high-power switching device SVG33The size of (A) is as follows:
Figure GDA0003502945470000034
wherein K is the reactive compensation coefficientK is more than 0 and less than or equal to 1, and the compensated power factor
Figure GDA0003502945470000035
The determination is made as to whether the user has selected,
Figure GDA0003502945470000036
when the traction load is in the traction condition, Q3For compatibility, Q is the time when the traction load is in the regenerative braking regime3Is perceptual;
(4) when in use
Figure GDA0003502945470000037
When, if
Figure GDA0003502945470000038
Then, the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG3 are all in a standby state at this time, and the negative sequence and the reactive power generated by the traction load both meet the compensation target without additional compensation.
Compared with the prior art, the invention has the beneficial effects that:
the traction-compensation transformer is provided with the traction port and the compensation port simultaneously, so that the common-box manufacturing of the traction transformer and the compensation transformer is realized, the traction port and the compensation port can be shared by windings, the functional integration level is high, the equipment floor area and the transformer manufacturing difficulty are effectively reduced, meanwhile, the traction port is single-phase-change in nature, the capacity utilization rate is high, the installation capacity of equipment can be effectively reduced, in addition, the in-phase power supply is implemented by canceling the electric phase splitting at the outlet of a traction substation, the regenerative braking energy of a train can be utilized to a higher degree, the power consumption is reduced, and the energy utilization rate is improved;
the invention can realize the comprehensive compensation of the reactive power and the negative sequence of the three-phase power system, and effectively solves the problem of the quality of the electric energy which is mainly generated by the electrified railway to the three-phase power system and takes the negative sequence as the main point;
the comprehensive compensation equipment realizes comprehensive compensation by essentially controlling reactive power flow without changing the active power flow of a system and transmitting positive-sequence active power, and has the advantage of capacity-free electricity charge;
the invention is suitable for reactive and negative sequence comprehensive treatment of various AC-DC and AC-DC-AC electric locomotives, the working condition of the comprehensive compensation equipment is reversible, and when the traction load is in a regenerative braking working condition, the comprehensive compensation equipment can still feed electric energy meeting the standard to the power grid.
Drawings
Fig. 1 is a schematic diagram of a topology of a non-inverting power supply structure according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a topology structure of a non-inverting power supply structure suitable for an AT power supply mode according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a topology of a traction-compensation transformer according to a second embodiment of the present invention.
Fig. 4 is a schematic flow chart of a comprehensive compensation method according to a third embodiment of the present invention.
Detailed Description
In order to better understand the inventive idea of the present invention, the working principle of the present invention is briefly explained here: with negative sequence allowance S of three-phase high-voltage busεAnd the power factor value mu is a compensation target, and reactive power with corresponding properties is sent out by controlling the SVG connected to the secondary side compensation port of the traction-compensation transformer, so that reactive power and a negative sequence generated by the electrified railway are comprehensively compensated, and the compensated reactive power and negative sequence meet the requirement of the compensation target, wherein the SVG only changes reactive power flow of a system and does not change active power flow of the system. The invention is further described with reference to the following figures and detailed description.
Example one
As shown in fig. 1, an embodiment of the present invention provides a structure of a traction substation with in-phase power supply, including a traction-compensation transformer TCT, an integrated compensation device CCE, and an integrated compensation measurement and control system MCS, where a primary terminal of the traction-compensation transformer TCT is connected to a three-phase high-voltage bus HB, a secondary side of the traction-compensation transformer TCT has a first secondary winding ab as a traction port, and forms an a terminal and a c terminal of the first compensation port with a second secondary winding b 'c, a c terminal and a b' terminal of the second compensation port, and an a terminal and a d terminal of the third compensation port; the input end and the output end of a first high-power switching device SVG1 in the CCE are respectively connected with the terminal a and the terminal c of a first compensation port, the input end and the output end of a second high-power switching device SVG2 are respectively connected with the terminal c and the terminal b' of a second compensation port, and the input end and the output end of a third high-power switching device SVG3 are respectively connected with the terminal a and the terminal d of a third compensation port; the first secondary winding ab of the traction-compensation transformer TCT is connected with a traction network, wherein the primary side of a voltage transformer VT is connected in parallel between the first secondary windings ab, the primary side of a current transformer CT is connected in series between the terminal a of the first secondary winding ab and a traction bus OCS, if the power supply mode of the traction network is a direct power supply mode or a direct power supply mode with a backflow line, the first secondary winding ab of the traction-compensation transformer TCT is connected with the traction bus OCS through the terminal a, and the terminal b is connected with a steel rail R and the ground, wherein LC is a certain electric locomotive running on a line; if the power supply mode of the traction network is an AT power supply mode, as shown in fig. 2, the a terminal of the first secondary winding ab of the traction-compensation transformer TCT is connected to the traction bus OCS, and the b terminal is connected to the negative feeder F, where AT (1), AT (2).. AT (i) respectively indicate each AT station set in the AT power supply mode, and LC is a certain electric locomotive running on the line.
In this embodiment, as shown in fig. 1 and fig. 2, the comprehensive compensation measurement and control system MCS includes a voltage transformer VT, a current transformer CT and a controller CD, a signal input end of the controller CD is connected to a measurement signal output end of the voltage transformer VT and a measurement signal output end of the current transformer CT, respectively, and a signal output end of the controller CD is connected to control ends of a first high-power switching device SVG1, a second high-power switching device SVG2 and a third high-power switching device SVG3 of the comprehensive compensation device CCE.
Example two
As shown in fig. 3, in the traction-compensation transformer TCT according to the embodiment of the present invention, the primary and secondary sides of the traction-compensation transformer TCT have two sets of windings, where the primary winding is a first primary winding AB and a second primary winding BC, and the secondary winding is a first secondary winding AB and a second secondary winding b' c; a, B, C three terminals are led out from the primary side of the traction-compensation transformer TCT, a fifth terminal of a, d, b 'and c is led out from the secondary side of the traction-compensation transformer TCT, and the a terminal and the c terminal of the first compensation port, the c terminal and the b' terminal of the second compensation port, the a terminal and the d terminal of the third compensation port and the traction port, namely the first secondary winding ab are respectively formed by the terminals; in fig. 3, the dotted terminals of the transformer winding are shown.
In this embodiment, the relationship between the number of turns n of the first primary winding AB and the number of turns m of the second primary winding BC is as follows: n is m; the first secondary winding ab takes the terminal a as a reference, a tap terminal d is led out at the position n ' of the number of turns of the winding, the tap terminal d is connected with the terminal b ' of the second secondary winding b ' c, and the number of turns of the second secondary winding b ' c is n '; wherein the values of n, m and n' are positive integers greater than 1; the first secondary winding ab and the second secondary winding b' c are independent windings, and the voltage levels are independent.
EXAMPLE III
As shown in fig. 4, an embodiment of the present invention provides a schematic flow chart of an integrated compensation method for an in-phase power supply traction substation, and takes a situation when an integrated compensation device CCE is in a three-port compensation mode as an example, the integrated compensation method for the in-phase power supply traction substation includes the above-mentioned structure of the in-phase power supply traction substation, and includes the specific steps of:
step one, taking the negative sequence allowance S of a three-phase high-voltage bus HBεAnd the power factor value mu is taken as a compensation target;
step two, calculating the voltage and current values measured by the voltage transformer VT and the current transformer CT through the controller CD of the comprehensive compensation measurement and control system MCS to obtain the traction load power SLAnd power factor
Figure GDA0003502945470000051
And thus judging the negative sequence power of the traction load
Figure GDA0003502945470000052
With negative sequence allowance SεThe relationship of (A), and the power factor
Figure GDA0003502945470000053
A relation to a target power factor value μ;
(1) when in use
Figure GDA0003502945470000054
When the three-port compensation mode is adopted, a first high-power switching device SVG1, a second high-power switching device SVG2 and a third high-power switching device SVG3 are put into the three-port compensation mode;
(2) if it is
Figure GDA0003502945470000055
Then, the negative sequence and the reactive power are comprehensively compensated at the same time, and the reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG3 at the moment1、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure GDA0003502945470000056
Figure GDA0003502945470000057
wherein K is reactive compensation coefficient, the value range is more than 0 and less than or equal to 1, and the compensated power factor
Figure GDA0003502945470000058
The determination is made as to whether the user has selected,
Figure GDA0003502945470000059
when the traction load is in the traction condition, Q1Is inductive/capacitive, Q2Is capacitive/inductive, Q3For compatibility, Q is the time when the traction load is in the regenerative braking regime1Is capacitive/inductive, Q2Is inductive/capacitive, Q3Is perceptual;
(3) if it is
Figure GDA00035029454700000510
Only the negative sequence is compensated without changing the system reactive power, and the reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG3 at the moment1、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure GDA00035029454700000511
when the traction load is in the traction condition, Q1、Q2And Q3Respectively inductive, capacitive and capacitive, Q being the value of the traction load when it is in the regenerative braking regime1、Q2And Q3Capacitive, inductive and inductive, respectively;
(4) when in use
Figure GDA00035029454700000512
When, if
Figure GDA00035029454700000513
Only the third high-power switching device SVG3 is put into operation, the operation is further simplified into a single-port compensation mode, and at the moment, the first high-power switching device SVG1 and the second high-power switching device SVG2 are in a standby state;
(5) when in use
Figure GDA00035029454700000514
When, if
Figure GDA00035029454700000515
Then, the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG3 are all in a standby state at this time, and the negative sequence and the reactive power generated by the traction load both meet the compensation target without additional compensation.

Claims (5)

1. The structure of the in-phase power supply traction substation comprises a traction-compensation transformer TCT in a CSS of the electrified railway in-phase power supply traction substation, wherein the primary side of the traction-compensation transformer TCT is provided with two groups of windings which are recorded as a first primary winding AB and a second primary winding BC and are respectively led out of A, B, C three terminals to be connected with a three-phase high-voltage bus HB, the secondary side of the traction-compensation transformer TCT is provided with two groups of windings which are recorded as a first secondary winding AB and a second secondary winding b' c, and the structure is characterized in that: the relationship between the number of turns n of the first primary winding AB and the number of turns m of the second primary winding BC of the traction-compensating transformer TCT is: n ═ m, and the second secondary winding b 'c has n' turns; a first secondary winding ab of the traction-compensation transformer TCT is taken as a traction port, a terminal a of the first secondary winding ab is taken as a reference, a tap terminal d is led out at the position n ' of the number of turns of the winding, and the tap terminal d is connected with a terminal b ' of a second secondary winding b ' c; wherein the values of n, m and n' are positive integers greater than 1; the first secondary winding ab and the second secondary winding b 'c respectively form an a terminal and a c terminal of a first compensation port, a c terminal and a b' terminal of a second compensation port and an a terminal and a d terminal of a third compensation port; the input end and the output end of a first high-power switch device SVG1 in the CCE are respectively connected with the terminal a and the terminal c of a first compensation port, the input end and the output end of a second high-power switch device SVG2 are respectively connected with the terminal c and the terminal b' of a second compensation port, and the input end and the output end of a third high-power switch device SVG3 are respectively connected with the terminal a and the terminal d of a third compensation port; the voltage transformer VT, the current transformer CT and the controller CD form a comprehensive compensation measurement and control system MCS, wherein the primary side of the voltage transformer VT is connected in parallel between the first secondary winding ab, the primary side of the current transformer CT is connected in series between the terminal a of the first secondary winding ab and the traction bus OCS, the signal input end of the controller CD is respectively connected with the measurement signal output ends of the voltage transformer VT and the current transformer CT, and the signal output end of the controller CD is connected with the control end of the comprehensive compensation equipment CCE.
2. The structure of a co-phase power supply traction substation according to claim 1, characterized in that: if the power supply mode of the traction network is a direct power supply mode or a direct power supply mode with a return line, the terminal a of the first secondary winding ab of the traction-compensation transformer TCT is connected to the traction bus OCS, and the terminal b is connected with the steel rail R and the ground; and if the traction network power supply mode is an AT power supply mode, the terminal a of the first secondary winding ab of the traction-compensation transformer TCT is connected to the traction bus OCS, and the terminal b is connected with the negative feeder line F.
3. A comprehensive compensation method for an in-phase power supply traction substation comprises the structure of the in-phase power supply traction substation disclosed by claim 1, and comprises the following specific steps:
step one, taking the negative sequence allowance S of a three-phase high-voltage bus HBεAnd the power factor value mu is taken as a compensation target;
step two, calculating the voltage and current values measured by the voltage transformer VT and the current transformer CT through the controller CD of the comprehensive compensation measurement and control system MCS to obtain the traction load power SLAnd power factor
Figure FDA0003502945460000011
And thus judging the negative sequence power of the traction load
Figure FDA0003502945460000012
With negative sequence allowance SεThe relationship of (A), and the power factor
Figure FDA0003502945460000013
The relationship with the target power factor value μ is determined as follows:
(1) when in use
Figure FDA0003502945460000014
When, if
Figure FDA0003502945460000019
Then comprehensive compensation equipment CCE is put into to comprehensively compensate the negative sequence and the reactive power; if it is
Figure FDA0003502945460000015
The CCE only compensates the negative sequence;
(2) when in use
Figure FDA0003502945460000016
When, if
Figure FDA00035029454600000110
Then the CCE is put into the comprehensive compensation equipment to compensate the reactive power only; if it is
Figure FDA0003502945460000017
The integrated compensation device CCE is in a standby state.
4. The method for comprehensively compensating the in-phase power supply traction substation according to claim 3, wherein the method comprises the following steps: the working time sequence of the power switch device when the CCE performs comprehensive compensation on the negative sequence and the reactive power is as follows: when in use
Figure FDA0003502945460000018
When the three-port compensation mode is adopted, a first high-power switching device SVG1, a second high-power switching device SVG2 and a third high-power switching device SVG3 are put into the three-port compensation mode; when in use
Figure FDA0003502945460000021
When, if
Figure FDA0003502945460000022
Only the third high-power switching device SVG3 is put into use, and the mode is simplified into a single-port compensation mode; if it is
Figure FDA0003502945460000023
The first high power switching device SVG1, the second high power switching device SVG2 and the third high power switching device SVG3 are all in standby state.
5. The method for comprehensively compensating the in-phase power supply traction substation according to claim 4, wherein the method comprises the following steps: the three-port compensation mode has the following specific scheme:
(1) when in use
Figure FDA0003502945460000024
When, if
Figure FDA0003502945460000025
The reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG31、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure FDA0003502945460000026
Figure FDA0003502945460000027
wherein K is reactive compensation coefficient, the value range is more than 0 and less than or equal to 1, and the compensated power factor
Figure FDA0003502945460000028
The determination is made as to whether the user has selected,
Figure FDA0003502945460000029
when the traction load is in the traction condition, Q1Is inductive/capacitive, Q2Is capacitive/inductive, Q3For compatibility, Q is the time when the traction load is in the regenerative braking regime1Is capacitive/inductive, Q2Is inductive/capacitive, Q3Is perceptual;
(2) when in use
Figure FDA00035029454600000210
When, if
Figure FDA00035029454600000211
The reactive power Q emitted by the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG31、Q2And Q3The sizes of (A) and (B) are respectively as follows:
Figure FDA00035029454600000212
when the traction load is in the traction condition, Q1、Q2And Q3Respectively inductive, capacitive and capacitive, Q being the value of the traction load when it is in the regenerative braking regime1、Q2And Q3Capacitive, inductive and inductive, respectively;
(3) when in use
Figure FDA00035029454600000213
When, if
Figure FDA00035029454600000214
Then the first high-power switching device SVG1 and the second high-power switching device SVG2 are in standby state at this time, and the reactive power Q emitted by the third high-power switching device SVG33The size of (A) is as follows:
Figure FDA00035029454600000215
wherein K is reactive compensation coefficient, the value range is more than 0 and less than or equal to 1, and the compensated power factor
Figure FDA00035029454600000216
The determination is made as to whether the user has selected,
Figure FDA00035029454600000217
when the traction load is in the traction condition, Q3For compatibility, Q is the time when the traction load is in the regenerative braking regime3Is perceptual;
(4) when in use
Figure FDA00035029454600000218
When, if
Figure FDA00035029454600000219
Then, at this time, the first high-power switching device SVG1, the second high-power switching device SVG2 and the third high-power switching device SVG3 are all in a standby state, and the negative sequence and the reactive power generated by the traction load both meet the compensation target.
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