CN110611323B - Electrified railway in-phase power supply comprehensive compensation device and comprehensive compensation method thereof - Google Patents

Electrified railway in-phase power supply comprehensive compensation device and comprehensive compensation method thereof Download PDF

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CN110611323B
CN110611323B CN201910939572.9A CN201910939572A CN110611323B CN 110611323 B CN110611323 B CN 110611323B CN 201910939572 A CN201910939572 A CN 201910939572A CN 110611323 B CN110611323 B CN 110611323B
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phase
transformer
compensation
reactive
port
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CN110611323A (en
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王辉
李群湛
解绍锋
易东
郭锴
吴波
张宇
张恒
昝小福
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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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses an in-phase power supply comprehensive compensation device and a compensation method for an electrified railway, and relates to the technical field of in-phase power supply of electrified railways. The system comprises a manager wiring transformer with a primary side connected with A, B, C three phases of a three-phase high-voltage bus HB, a reactive power compensation unit SVG1 connected with an ac port of the wiring transformer, and a reactive power compensation unit SVG2 connected with an ad port of the wiring transformer; the reactive power compensation unit SVG1 is connected with an ac port of a wiring transformer, the reactive power compensation unit SVG2 is connected with an ad port of a wiring transformer, and the reactive power compensation unit SVG3 is connected with an ab port of a wiring transformer; the measurement and control system MCS comprises a voltage transformer VT, a current transformer CT and a controller CD, wherein the 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.

Description

Electrified railway in-phase power supply comprehensive compensation device and comprehensive compensation method thereof
Technical Field
The invention relates to the technical field of traction power supply of alternating current electric railways.
Background
The rapid development of the China high-speed railway further shows the superiority of the power frequency single-phase power supply system of the traditional China alternating current electrified railway. The single-phase power frequency standard power supply requires that an electric split phase is arranged at a split-phase partition, and in order to reduce the influence of traction load on unbalance of a power system, a scheme of alternating phase sequence and split-phase partition power supply is generally adopted. Practice and theory show that the electric phase separation is the weakest link in the traction power supply system, and when a train passes through the electric phase separation, the problems of over-voltage operation, train phase separation falling and the like can be generated, and in order to improve the transportation quality, ensure the operation reliability, reduce the train phase separation, improve the utilization rate of regenerative braking energy of the train and the like, the quantity of the electric phase separation is preferably reduced as much as possible.
The existing passing phase separation technology is mainly divided into a ground automatic passing phase separation technology and a vehicle-mounted automatic passing phase separation technology, but the phenomenon of multiple times of overvoltage occurs in actual operation, so that serious influence and hidden danger are brought to the safety operation of an electrified railway, and a power supply breakpoint still exists. The fundamental measure to eliminate the adverse effect of the electrical phase separation is to reduce or cancel the electrical phase separation. The professor of southwest traffic university puts forward the in-phase power supply concept for the first time, and brings a great deal of effective research to the scientific research team, and forms the complete in-phase power supply system theory and engineering technology. The in-phase power supply technology can cancel the electric split phase at the outlet of the substation, and the novel bilateral power supply technology can cancel the electric split phase at the outlet of the substation, so that the full-line neutral-section-free through power supply is realized, and the adverse effects caused by the electric split phase can be eliminated. Among them, bilateral power supply has been widely adopted by the soviet union, and the bilateral power supply has problems of power crossing (current balancing), protection coordination, electric energy charging and the like, which can be technically solved by using lower cost, but the difficulty is that whether the electric power department accepts the power.
Compared with the combined type in-phase power supply technology, the invention realizes the comprehensive compensation of the negative sequence and the reactive power based on the active power flow, realizes the comprehensive compensation of the negative sequence and the reactive power based on the active reactive power flow, does not change the existing active power flow of the system, realizes in-phase power supply, and simultaneously compensates the harmonic current problem possibly brought by traction load at the three-phase high-voltage bus.
Disclosure of Invention
The invention aims to provide an in-phase power supply comprehensive compensation device for an electrified railway, which effectively solves the problem that an alternating current electrified railway has an unbalanced effect on three-phase voltage at a public connection point and does not bring new electric energy quality.
The invention further aims to provide an in-phase power supply comprehensive compensation method for the electrified railway, which effectively solves the problem that the alternating current electrified railway has an influence on the imbalance of the three-phase voltage at the public connection point and does not bring new electric energy quality.
The aim of the invention is realized by the following technical scheme: the in-phase power supply comprehensive compensation device for the electrified railway comprises a three-phase high-voltage bus HB connected with a power grid transformer substation, a single-phase traction transformer TT with the primary side connected with the three-phase high-voltage bus HB, a negative sequence compensation device NCD and a measurement and control system MCS, wherein the in-phase power supply traction substation CSS is formed by the in-phase power supply comprehensive compensation device; the port on one side of the secondary side of the single-phase traction transformer TT is connected with a current transformer CT in series and then connected with an overhead contact system OCS, and the port on the other side is connected with a voltage transformer VT in parallel and then grounded; the negative sequence compensation device NCD comprises two topological structures including a wiring transformer with a primary side connected with A, B, C three phases of a three-phase high-voltage bus HB; one of the topologies, described as a two-port compensation mode, comprises a double-port wiring transformer with a primary side connected with A, B, C three phases of a three-phase high-voltage bus HB, wherein an ac port of a secondary side of a final wiring transformer is connected with a reactive compensation unit SVG1, and an ad port of a secondary side of a wiring transformer is connected with a reactive compensation unit SVG 2; the second topological structure is described as a three-port compensation mode and comprises a common mode transformer with a connection of A, B, C three phases of a three-phase high-voltage bus HB, wherein an ac port of a secondary side of a connection transformer is connected with a reactive compensation unit SVG1, an ad port of a secondary side of a connection transformer is connected with a reactive compensation unit SVG2, and an ab port of a secondary side of a connection transformer is connected with a reactive compensation unit SVG 3; the measurement and control system MCS comprises a voltage transformer VT, a current transformer CT and a controller CD, wherein the 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; in the two-port compensation mode, the output end of the controller CD is connected with the control ends of the reactive compensation units SVG1 and SVG2, respectively, and in the three-port compensation mode, the output end of the controller CD is connected with the control ends of the reactive compensation units SVG1, SVG2 and SVG3, respectively.
The primary winding of the single-phase traction transformer TT is connected with any two phases in the three-phase high-voltage bus HB, and the negative sequence compensation device NCD forms a topological structure matched with the primary winding of the single-phase traction transformer TT according to the phase sequence of the primary winding of the single-phase traction transformer TT connected with the three-phase high-voltage bus HB; if the traction network power supply mode is a direct supply mode of a direct supply mode or a direct supply mode with a return line, one terminal of the TT secondary winding of the single-phase traction transformer is grounded, the other terminal of the TT secondary winding of the single-phase traction transformer is connected to the contact network OCS, and if the traction network power supply mode is an AT power supply mode, the one terminal of the TT secondary winding of the single-phase traction transformer is connected to the contact network OCS, and the other terminal of the TT secondary winding of the single-phase traction transformer is connected to the negative feeder.
The wiring compensation transformer comprises two parallel single-phase iron cores I, a single-phase iron core II and windings thereof, wherein a first primary winding AB and a first secondary winding AB are wound on the single-phase iron cores I, and a second primary winding CD and a second secondary winding CD are wound on the single-phase iron cores II; the midpoint tap of the first primary winding AB is connected with the D terminal of the second primary winding, and the midpoint tap of the second secondary winding cd is connected with the b terminal of the first secondary winding AB; the relation between the number of turns m of the first primary winding AB and the number of turns n of the second primary winding CD is:the relationship between the number of turns m 'of the first secondary winding ab and the number of turns n' of the second secondary winding cd is: n '=2m'.
The other object of the invention is realized by the following technical scheme: the method for comprehensively compensating the in-phase power supply of the electrified railway comprises the following specific steps of:
(1) The load process of the traction substation is determined through a computer simulation technology, and the final topological structure form is determined according to the load process of the traction substation and the topological structure of the negative sequence compensation device NCD.
(2) With negative sequence allowance S at the common connection point corresponding to the three-phase high-voltage bus HB ε As its negative sequence power enable.
(3) The controller CD calculates the load S through the voltage and current measured by the voltage transformer VT and the current transformer CT L Judging the load S L Negative sequence power of (2)Negative sequence allowable power S with three-phase high-voltage bus ε Is the relation of: if->At this time, negative sequence compensation is not needed; if->In this case, the negative sequence needs to be managed.
(4) If it isThe negative sequence compensation device NCD is put into operation, and the controller controls the corresponding reactive compensation units to send out reactive power, so that the negative sequence is treated.
The method adopts a two-port compensation mode, and the comprehensive compensation method only compensates the negative sequence current generated by the active current component of the load fundamental wave; by controlling the reactive power Q emitted by the reactive power compensation unit SVG1 1 And reactive power Q sent by reactive power compensation unit SVG2 2 The size and the type of the negative sequence and reactive power can be comprehensively compensated; if the power factor at the three-phase high-voltage bus after compensation is unchanged, the sizes of the reactive compensation unit SVG1 and the reactive compensation unit SVG2 are respectively as follows:when the feeder load is in traction working condition, Q 1 And Q 2 Respectively inductive and capacitive; when the feeder load is in the regeneration working condition, Q 1 And Q 2 Capacitive and inductive, respectively.
The three-port compensation mode is adopted, and the comprehensive compensation method is realized by controlling the reactive power Q sent by the reactive power compensation unit SVG1 1 And reactive power Q sent by reactive power compensation unit SVG2 2 Reactive power Q sent by reactive power compensation unit SVG3 3 The magnitude and the type of the negative sequence and the reactive power are comprehensively compensated; in one of these cases, if the power factor at the three-phase high-voltage bus HB is not changed after compensation, the sizes of the reactive compensation unit SVG1, the reactive compensation unit SVG2, and the reactive compensation unit SVG3 are respectively:when the feeder load is in traction working condition, Q 1 、Q 2 And Q 3 Respectively, inductive, capacitive and capacitive; when the feeder load is in the regeneration working condition, Q 1 、Q 2 And Q 3 Respectively, capacitive, inductive, and inductive.
Compared with the prior art, the invention has the beneficial effects that:
1. the technical scheme is suitable for negative sequence management under various power factor locomotive conditions;
2. the technical scheme can realize the comprehensive compensation of the negative sequence and the reactive power;
3. compared with the existing compensation at the traction transformer port, the compensation transformer in the technical scheme can reduce the installation capacity of the traction transformer and has the technical advantage of no-payment of capacity electric charge;
4. according to the technical scheme, the compensation transformer is high in capacity utilization, and the installation capacity of the matching transformer is reduced;
5. the invention has simple result, reliable technology, excellent performance and convenient implementation.
Drawings
FIG. 1 is a schematic diagram of a two-port compensation mode structure according to an embodiment of the invention
FIG. 2 is a schematic diagram of the relationship structure between the two-port compensation mode measurement and control system and the reactive compensation unit, and the traction load signal acquisition in the embodiment of the invention.
FIG. 3 is a schematic diagram of a three-port compensation mode structure according to an embodiment of the present invention
Fig. 4 is a schematic diagram of a relationship structure between a three-port compensation mode measurement and control system and a reactive compensation unit, and a traction load signal acquisition in an embodiment of the present invention.
Fig. 5 is a schematic flow chart of a method for comprehensively compensating in-phase power supply of an electrified railway in an embodiment of the invention.
Fig. 6 is a schematic diagram of a wired compensation transformer in an embodiment of the invention.
Detailed Description
For a better understanding of the inventive concept, the working principle of the invention is described here: the three-phase high-voltage bus is used as a negative sequence standard examination point, the SVG reactive power compensation unit connected with the compensation transformer is used for sending reactive power to compensate the negative sequence current (power) generated by the feeder load, and the standard requirement is met after compensation, wherein the reactive power compensation unit does not change the original active power flow of the system. The invention is further described below with reference to the drawings and embodiments.
Example 1
As shown in fig. 1, the embodiment of the invention provides one topological structure, wherein one side port of the secondary side of the single-phase traction transformer TT is connected with a current transformer CT in series and then is connected with a contact net OCS, the other side port is connected with a voltage transformer VT in parallel and then is grounded, and power is supplied to a locomotive LC through the contact net OCS; the two-port compensation mode comprises a wiring transformer with a primary side connected with A, B, C three phases of a three-phase high-voltage line HB, a reactive compensation unit SVG1 is connected with an ac port of the wiring transformer, and a reactive compensation unit SVG2 is connected with an ad port of the wiring transformer; in fig. 1, the same-name ends of TT windings of a single-phase traction transformer are denoted by diamond-solid, and the same-name ends of wiring transformer windings are denoted by delta.
As shown in fig. 2, the measurement and control system MCS includes a voltage transformer VT, a current transformer CT, and a controller CD, where input ends of the controller CD are connected to measurement signal output ends of the voltage transformer VT and the current transformer CT, and output ends of the controller CD are connected to control ends of the reactive compensation units SVG1 and SVG2, respectively.
Example two
As shown in fig. 3, the second topological structure is provided in the embodiment of the present invention, the port on one side of the secondary side of the single-phase traction transformer TT is connected in series with the current transformer CT and then connected to the contact net OCS, the port on the other side is connected in parallel with the voltage transformer VT and then grounded, and power is supplied to the locomotive LC through the contact net OCS; the three-port compensation mode comprises a wiring transformer, a reactive compensation unit SVG1, a reactive compensation unit SVG2 and a reactive compensation unit SVG3, wherein the primary side of the three-port compensation mode is connected with A, B, C three phases of a three-phase high-voltage bus HB, the reactive compensation unit SVG1 is connected with an ac port of a wiring transformer, the reactive compensation unit SVG2 is connected with an ad port of a wiring transformer, and the reactive compensation unit SVG3 is connected with an ab port of a wiring transformer; in fig. 3, the same-name ends of TT windings of the single-phase traction transformer are denoted by the same-name ends of wiring transformer windings.
As shown in fig. 4, the measurement and control system MCS includes a voltage transformer VT, a current transformer CT and a controller CD, where the input end of the controller CD is connected to the measurement signal output ends of the voltage transformer VT and the current transformer CT respectively; the output end of the controller CD is connected to the control ends of the reactive compensation units SVG1, SVG2 and SVG3, respectively.
Example III
As shown in fig. 5, the embodiment of the invention provides a flow chart of an in-phase power supply comprehensive compensation method of an electrified railway, and the embodiment takes a two-port compensation mode comprehensive compensation method as an example, and the in-phase power supply comprehensive compensation method of the electrified railway comprises the following specific steps:
(1) The load process of the traction substation is determined through a computer simulation technology, and the final topological structure form is determined according to the load process of the traction substation and the topological structure of the negative sequence compensation device NCD.
(2) With negative sequence allowance S at the common connection point corresponding to the three-phase high-voltage bus HB ε As its negative sequence power enable;
(3) The controller CD calculates the load S through the voltage and current measured by the voltage transformer VT and the current transformer CT L Judging the load S L Negative sequence power of (2)Negative sequence allowable power S with three-phase high-voltage bus ε Is the relation of: if->At this time, negative sequence compensation is not needed; if->In this case, the negative sequence needs to be managed.
(4) If it isThe negative sequence compensation device NCD is put into operation, and the controller controls the corresponding reactive compensation units to send out reactive power, so that the negative sequence is treated. If the power factor at the three-phase high-voltage bus after compensation is unchanged, the sizes of the reactive compensation unit SVG1 and the reactive compensation unit SVG2 are respectively as follows: />When the feeder load is in traction working condition, Q 1 And Q 2 Respectively inductive and capacitive; when the feeder load is in the regeneration working condition, Q 1 And Q 2 Capacitive and inductive, respectively.
Example IV
As shown in fig. 6, a schematic diagram of a wiring compensation transformer provided by the embodiment of the invention includes two parallel single-phase iron cores 1, a single-phase iron core 2 and windings thereof, wherein a first primary winding AB and a first secondary winding AB are wound on the single-phase iron core 1, and a second primary winding CD and a second secondary winding CD are wound on the single-phase iron core 2; the midpoint tap of the first primary winding AB is connected with the D terminal of the second primary winding, and the midpoint tap of the second secondary winding cd is connected with the b terminal of the first secondary winding AB; the relation between the number of turns m of the first primary winding AB and the number of turns n of the second primary winding CD is:the relationship between the number of turns m 'of the first secondary winding ab and the number of turns n' of the second secondary winding cd is: n '=2m'.

Claims (5)

1. The in-phase power supply comprehensive compensation device for the electrified railway comprises a three-phase high-voltage bus HB connected with a power grid transformer substation, a single-phase traction transformer TT with the primary side connected with the three-phase high-voltage bus HB, a negative sequence compensation device NCD and a measurement and control system MCS, wherein the in-phase power supply traction substation CSS is formed by the in-phase power supply comprehensive compensation device; the port on one side of the secondary side of the single-phase traction transformer TT is connected with a current transformer CT in series and then connected with an overhead contact system OCS, and the port on the other side is connected with a voltage transformer VT in parallel and then grounded; the method is characterized in that: the negative sequence complementThe compensation device NCD comprises two topological structures including a wiring transformer with a primary side connected with A, B, C three phases of a three-phase high-voltage bus HB, wherein the wiring transformer comprises two parallel single-phase iron cores I (1), a single-phase iron core II (2) and windings thereof, a first primary winding AB and a first secondary winding AB are wound on the single-phase iron core I (1), and a second primary winding CD and a second secondary winding CD are wound on the single-phase iron core II (2); the midpoint tap of the first primary winding AB is connected with the D terminal of the second primary winding, and the midpoint tap of the second secondary winding cd is connected with the b terminal of the first secondary winding AB; the relation between the number of turns m of the first primary winding AB and the number of turns n of the second primary winding CD is:the relationship between the number of turns m 'of the first secondary winding ab and the number of turns n' of the second secondary winding cd is: n '=2m'; one of the topologies: the two-port compensation mode is described, wherein taps of an A terminal, a B terminal and a C terminal of a primary side are respectively connected with A, B, C three phases of a three-phase high-voltage bus HB to form a wiring transformer, an ac port of a secondary side of the wiring transformer is connected with a reactive compensation unit SVG1, and an ad port of a secondary side of the wiring transformer is connected with a reactive compensation unit SVG 2; and the second topological structure is as follows: the three-port compensation mode is described, wherein taps of an A terminal, a B terminal and a C terminal of a primary side are respectively connected with A, B, C three phases of a three-phase high-voltage bus HB, an ac port of a secondary side of the wiring transformer is connected with a reactive compensation unit SVG1, an ad port of a secondary side of a multi-port wiring transformer is connected with a reactive compensation unit SVG2, and an ab port of a secondary side wiring transformer is connected with a reactive compensation unit SVG 3; the measurement and control system MCS comprises a voltage transformer VT, a current transformer CT and a controller, wherein the input end of the controller is respectively connected with the measurement signal output ends of the voltage transformer VT and the current transformer CT; in the case of the two-port compensation mode, the output end of the controller is respectively connected with the control ends of the reactive compensation units SVG1 and SVG2, and in the case of the three-port compensation mode, the output end of the controller is respectively connected with the reactive compensation units SVG1, SVG2 and SVG2The control terminals of the units SVG3 are connected.
2. The electrified railway in-phase power supply comprehensive compensation device according to claim 1, wherein: the primary winding of the single-phase traction transformer TT is connected with any two phases in the three-phase high-voltage bus HB, and the negative sequence compensation device NCD forms a topological structure matched with the primary winding of the single-phase traction transformer TT according to the phase sequence of the primary winding of the single-phase traction transformer TT connected with the three-phase high-voltage bus HB; if the traction network power supply mode is a direct supply mode of a direct supply mode or a direct supply mode with a return line, one terminal of the TT secondary winding of the single-phase traction transformer is grounded, the other terminal of the TT secondary winding of the single-phase traction transformer is connected to the contact network OCS, and if the traction network power supply mode is an AT power supply mode, the one terminal of the TT secondary winding of the single-phase traction transformer is connected to the contact network OCS, and the other terminal of the TT secondary winding of the single-phase traction transformer is connected to the negative feeder.
3. An in-phase power supply comprehensive compensation method based on the electrified railway in-phase power supply comprehensive compensation device according to claim 1 or 2, which comprises the following specific steps:
(1) Determining a load process of the traction substation by a computer simulation technology, and determining a final topological structure form according to the load process of the traction substation by comparing and selecting a topological structure of the negative sequence compensation device NCD;
(2) With negative sequence allowance S at the common connection point corresponding to the three-phase high-voltage bus HB ε As its negative sequence power enable;
(3) The controller CD calculates the load S through the voltage and current measured by the voltage transformer VT and the current transformer CT L Judging the load S L Negative sequence power of (2)Negative sequence allowable power S with three-phase high-voltage bus ε Is the relation of: if->At this time, negative sequence compensation is not needed; if->At this time, the negative sequence needs to be treated;
(4) If it isThe negative sequence compensation device NCD is put into operation, and the controller controls the corresponding reactive compensation units to send out reactive power, so that the negative sequence is treated.
4. A method of in-phase power supply integrated compensation as claimed in claim 3, wherein: when the two-port compensation mode is adopted, the comprehensive compensation method only compensates the negative sequence current generated by the active current component of the load fundamental wave; by controlling the reactive power Q emitted by the reactive power compensation unit SVG1 1 And reactive power Q sent by reactive power compensation unit SVG2 2 The magnitude and the type of the negative sequence and the reactive power are comprehensively compensated; if the power factor at the three-phase high-voltage bus after compensation is unchanged, the sizes of the reactive compensation unit SVG1 and the reactive compensation unit SVG2 are respectively as follows:when the feeder load is in traction working condition, Q 1 And Q 2 Respectively inductive and capacitive; when the feeder load is in the regeneration working condition, Q 1 And Q 2 Capacitive and inductive, respectively.
5. A method of in-phase power supply integrated compensation as claimed in claim 3, wherein: when the three-port compensation mode is adopted, the comprehensive compensation method controls the reactive power Q sent by the reactive power compensation unit SVG1 1 And reactive power Q sent by reactive power compensation unit SVG2 2 Reactive power Q sent by reactive power compensation unit SVG3 3 The magnitude and the type of the negative sequence and the reactive power are comprehensively compensated; in one of these cases, if the power factor at the three-phase high-voltage bus HB is not changed after compensation, the sizes of the reactive compensation unit SVG1, the reactive compensation unit SVG2, and the reactive compensation unit SVG3 are respectively:when the feeder load is in traction working condition, Q 1 、Q 2 And Q 3 Respectively, inductive, capacitive and capacitive; when the feeder load is in the regeneration working condition, Q 1 、Q 2 And Q 3 Respectively, capacitive, inductive, and inductive.
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