WO2020093859A1 - Sectioning post uninterruptible flexible electrical phase separation device and control method therefor - Google Patents

Abstract

Disclosed are a sectioning post uninterruptible flexible electrical phase separation device and a control method therefor, the device comprising: a single-phase isolation transformer (T _T), a main circuit breaker (S), a first voltage sensor (PT ₀) to a fourth voltage sensor (PT ₃), a two-phase back-to-back converter (BLQ) sharing a direct-current side capacitor, a converter current sensor (CT ₀), and pantograph position and current sensing mechanisms (CLT ₁, CLT ₂). By means of the device, by adjusting voltage and current amplitudes and the phase of a neutral section, the problems of transition area arcing and inaccurate pantograph position detection of a flexible automatic passing phase separation apparatus can be solved, thereby ensuring that an electric train passes through a phase separation area stably and uninterruptedly, and fully meeting the requirements of a high-speed heavy-haul train for a traction power supply system.

Description

Partition-free flexible electrical phase separation equipment without interruption and control method thereof

Cross-reference of related applications

This application requires the priority of the Chinese patent application number "201811313066.0" submitted by Tsinghua University on November 06, 2018, with the invention titled "Flexible Electrical Phase Separation Equipment without Partitions and Its Control Method".

Technical field

The feedback of this application belongs to the technical field of electrified railway traction power supply system, and particularly relates to a flexible electrical phase separation device without power outage in a zone and its control method.

Background technique

China's electrified railways mainly adopt single-phase power frequency AC power supply, the effective value of the voltage level is 27.5KV, and the power system is a three-phase AC power supply mode. Therefore, it is necessary to adopt the alternating phase sequence power supply method, which can make the three-phase load balance , To ensure the supply of sufficient capacity, improve the utilization rate of the system, and at the same time can offset the negative sequence current injection into the external power grid to a certain extent. In order to prevent short circuit between phases, adjacent phases must be separated by air or insulation. It is called the neutral phase of the catenary, and an electrical phase split is required every 25km on average.

In the related art, a manual over-phase or automatic over-phase device that runs an electric locomotive through the section where the electric phase is separated requires a series of "power-off-reset" operations, which will cause different degrees and types of Transient processes such as voltage and inrush currents cause failures such as locomotive protection actions, transformer trips, and overcurrent of auxiliary machines, and even affect the safe operation of electrified railways.

The flexible automatic over-phase splitting device adjusts the voltage and current amplitude and phase of the neutral section to make the traction pantograph smoothly transition from the traction power supply arm in the direction of the train to the neutral section of the phase separation area, and then The neutral section of the phase zone smoothly transitions to the traction power supply arm in the direction of the train. The flexible automatic phase separation device can ensure that the electric train passes through the phase separation area smoothly and without interruption. Most of the flexible automatic phase separation devices in related invention patents use the axle counting method to determine the position of the locomotive, but the position of the pantograph cannot be accurately obtained, and the flexible transition of the electric train in the electrical phase separation area cannot be guaranteed, and the load current cannot be guaranteed when passing the coincidence area. The smooth transition from the traction power supply arm to the flexible automatic over-phase device causes the electric train pantograph and the traction power supply arm to be electrically separated, resulting in impact overcurrent, arcing, damage to the equipment, and affect the safe operation of the electrified railway.

Summary of the invention

The feedback of this application aims to solve one of the technical problems in the related technologies at least to a certain extent.

To this end, an objective of the feedback of this application is to propose a flexible electrical phase separation device without power outages in the zoning, which can ensure that electric trains run smoothly through the phase separation area without power outages, and are fully adapted to high-speed, heavy-load trains for traction power supply System requirements, without the use of ground position sensors, phase-locked calculations and phasor calculations of voltage and current signals, and when the equipment faults cause electrical split-phase arc drawing, the arc can be effectively extinguished without the power supply arm being powered off.

Another purpose of the feedback of this application is to propose a flexible electrical phase separation control method without power interruption in the subarea.

In order to achieve the above purpose, the present application feedback on the one hand an embodiment proposes a zoning-free flexible electrical phase separation device, including: isolation transformer _TT and main circuit breaker S; first voltage sensor PT ₀ to fourth voltage sensor PT ₃ for detecting the instantaneous value of the voltage at each point; a two-phase back-to-back converter BLQ sharing a DC-side capacitor, the converter BLQ includes a rectifier-side converter VSC _a and an inverter-side converter VSC _b , For the train pantograph from the first power supply arm to pass through the electrical phase separation, and from the direction of the second power supply arm to pass through the electrical phase separation; converter current sensor CT ₀ , used to detect the converter BLQ Inverter-side converter VSC _b outputs current i ₀ to neutral section 0; pantograph position and current sensing mechanism CLT ₁ and mechanism CLT _{2 are} used to detect whether the current pantograph position is in the corresponding AD interval Or BE interval, and detect the instantaneous value i ₁ or i ₂ of the current flowing through the mechanism CLT ₁ or the mechanism CLT ₂ when the pantograph is in the interval.

The zoning-free flexible electrical phase-separation device of the feedback embodiment of the present application, by adjusting the voltage and current amplitude and phase of the neutral section, makes the traction pantograph smoothly transition from the traction power supply arm in the direction of the train to the The neutral section of the phase separation area, and then smoothly transition from the neutral section of the phase separation area to the traction power supply arm of the train running direction, solving the problem of inaccurate detection of the pantograph position in the transition area of the flexible automatic phase separation device, and the pantograph position detection , Can ensure that electric trains pass through the phase-separation area smoothly and without interruption, fully adapt to the requirements of high-speed and heavy-load trains on the traction power supply system, without the need for ground position sensors, and the need for phase-locked calculation and phasor calculation of voltage and current signals , And when the equipment failure causes the electrical splitting arc, the arc can be effectively extinguished without the power supply arm being powered off.

In addition, according to this application, the feedback of the above-mentioned embodiment of the partitionless flexible electrical phase separation device may further have the following additional technical features:

Further, in an embodiment of the feedback of the present application, the terminal z of the rectifier-side converter VSC _a is connected to the lower port S-l2 of the main circuit breaker S, and the rectifier-side converter VSC _a w terminal connected to the zero potential point on the rail; the VSC inverter _b-side converter, the inverter-side converter terminal of the VSC _b x the single-phase secondary winding of the isolation transformer T _T b terminal ₂ is connected, In addition, the connection relationship between the T _T secondary ports a ₂ and b ₂ and the VSC _b ports x and y can be interchanged, and the terminal y of the inverter-side converter VSC _b is connected to the zero potential point on the rail.

Optionally, when the isolation transformer T _{T is} composed of one isolation transformer, the primary winding port a _{1 of} the isolation transformer T _T and the BLQ ports x and z of the rectifier converter can pass through the circuit breaker S The upper and lower ports are connected to either the first power supply arm or the second power supply arm. Further, in an embodiment of the feedback of the present application, the first voltage sensor PT _{0 is} used to detect the instantaneous value of the neutral segment 0 voltage to ground v ₀ ; the second voltage sensor PT _{1 is} used to detect the first power supply The instantaneous value of the arm-to-earth voltage v ₁ ; the third voltage sensor PT _{2 is} used to detect the instantaneous value of the second power supply arm-to-earth voltage v ₂ ; the fourth voltage sensor PT _{3 is} used to detect the inverter-side converter VSC _b The instantaneous voltage v _b between the terminals.

Further, in the present application embodiment a feedback embodiment, the phase separation mechanism CLT ₁ disposed outside the overlap region MD ₁ AA 'section is in electrical partition, and the partition means CLT ₂ provided in the electrical phase of the overlap region At the BB 'zone outside MD ₂ .

Further, in an embodiment of the feedback of the present application, the mechanism CLT ₁ includes the first power supply arm, a first current sensor, a first feedthrough wire HL1 and a second feedthrough wire HL2, and the mechanism CLT ₂ includes the second power supply arm, the second current sensor, the third feed-through wire HL ₃ and the fourth feed-through wire HL ₄ .

Wherein, the circuit breaker S is a three-phase circuit breaker, which is disconnected from the electrical phase-separated contact network line and the neutral section 0 during equipment maintenance, and the device or the contact network line is faulty. The equipment is disconnected and isolated from the contact network cable, wherein the three upper ports of the circuit breaker S are connected to the power supply arm, and the three lower ports are connected to the isolation transformer _TT and the converter BLQ; the neutral section circuit breaker mechanism BK, the mechanism BK includes a neutral section 0 ₁ , a neutral section 0 ₂ and a circuit breaker QF.

Further, in an embodiment of the feedback of the present application, wherein the current instantaneous value of the current is detected by the pantograph position and the current sensing mechanism CLT ₁ and mechanism CLT ₂ and the converter current sensor CT ₀ , and the current Whether the instantaneous voltage value and the current instantaneous value are greater than a preset threshold to determine the pantograph position, and control the switching between the voltage control mode and the current control mode according to the pantograph position.

Further, in an embodiment of the feedback of the present application, the isolation transformer _{TT is} composed of one or two isolation transformers.

Further, in an embodiment of the feedback of the present application, it further includes: a neutral section circuit breaker mechanism BK, the mechanism BK includes a neutral section 0 ₁ , a neutral section 0 ₂ and a circuit breaker QF.

Further, in an embodiment of the feedback of the present application, both the voltage and current ramping algorithms are linear modulations, wherein during the voltage ramping process, the instantaneous value of the neutral voltage changes linearly; during the current ramping process, the converter The instantaneous value of the output current changes linearly.

In order to achieve the above purpose, the present application feedback on the other hand, an embodiment proposes a method for controlling a flexible electrical phase-separation without power failure in a partition, using the flexible electrical phase-separation equipment without power-off for a partition as described above, wherein the method includes : Detect the instantaneous value of voltage at each point; control the pantograph of the train from the first power supply arm to pass through the electrical phase separation, and from the direction of the second power supply arm to pass through the electrical phase separation; detect the inverter of the BLQ converter VSC _b-side converter section of the neutral current I 0 output _0; when detecting the current flowing through the pantograph is located at a position corresponding to the interval AD, and detects the pantograph mechanism is in the interval of the CLT ₁ or CLT ₂ means the instantaneous value of the current i ₁ or i _2.

The application of the embodiment of the feedback embodiment of the present application has no power-off flexible electrical phase separation control method, which solves the problem of inaccurate detection of the pantograph in the transition area in the flexible automatic over-phase separation, and can ensure that the electric train is stable and uninterrupted Electric driving through the phase separation area, fully adapting to the requirements of high-speed and heavy-load trains on the traction power supply system, without the need for ground position sensors, no need for phase-locked calculation and phasor calculation of voltage and current signals, and when the equipment fails to cause electrical separation When the arc is drawn, the arc can be effectively extinguished without the power supply arm being powered off.

The additional aspects and advantages of the feedback of this application will be partially given in the following description, and some will become apparent from the following description, or be learned through the practice of the feedback of this application.

BRIEF DESCRIPTION

This application feedback the above-mentioned and / or additional aspects and advantages will become apparent and easy to understand from the following description of the embodiments with reference to the drawings, in which:

FIG. 1 is a schematic diagram of the structure of a flexible electrical phase-separation device without power-off of a partition according to an embodiment of the present application feedback;

FIG. 2 is a schematic diagram of the structure of a flexible electrical phase-separation device with no power failure according to a specific embodiment 1 of the feedback according to the present application;

FIG. 3 is a schematic diagram of the structure of a flexible electrical phase-separation device without power-off of a partition according to a specific embodiment 2 of the feedback of this application;

FIG. 4 is a schematic diagram of the structure of a flexible electrical phase-separation device with no power-off of a partition according to Embodiment 3 of the feedback of the present application;

5 is a schematic structural diagram of a pantograph position and current sensing mechanism CLT ₁ system according to an embodiment of the present feedback;

6 is a schematic structural diagram of a pantograph position and current sensing mechanism CLT ₂ system according to an embodiment of the present feedback;

7 is a schematic structural diagram of a neutral section circuit breaker mechanism BK according to a third embodiment of the feedback according to the present application;

8 is a schematic top view of the electrical phase-separation structure of the substations according to specific embodiments one and two of the feedback according to the present application;

FIG. 9 is a schematic top view of the electrical phase separation structure of the district according to the third embodiment of the feedback of the present application.

detailed description

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are intended to explain the feedback of the present application, and cannot be understood as a limitation to the feedback of the present application.

The following describes a flexible electrical phase-separation device with no power-off according to the feedback embodiment of the present application and a control method thereof with reference to the drawings.

FIG. 1 is a schematic diagram of the structure of a flexible electrical phase-separation device without power-off of a partition according to an embodiment of the present application.

As shown in FIG. 1, the uninterrupted flexible electrical phase-separation equipment in this zone includes: isolation transformer T _T1 (100), main circuit breaker S (200), first voltage sensor PT ₀ to fourth voltage sensor PT ₃ (300 ), A two-phase back-to-back converter BLQ (400) sharing a DC-side capacitor, converter current sensor CT ₀ (500), pantograph position and current sensing mechanism CLT ₁ (600) and mechanism CLT ₂ (700 ).

Among them, the first voltage sensor PT ₀ to the fourth voltage sensor PT ₃ (300) are used to detect the instantaneous value of the voltage at each point. The two-phase back-to-back converter BLQ (400) sharing a DC-side capacitor includes a rectifier-side converter VSC _a and an inverter-side converter VSC _b , used for the train pantograph from the first power supply arm to pass through the power distribution Phase, and driving from the direction of the second power supply arm through the electrical phase separation. The converter current sensor CT ₀ (500) is used to detect the current i ₀ output from the inverter-side converter VSC _{b of the} converter BLQ to the neutral section ₀ . The pantograph position and current sensing mechanism CLT ₁ (600) and mechanism CLT ₂ (700) are used to detect whether the current pantograph position is in the corresponding AD section or BE section, and to detect the pantograph flowing through the mechanism when it is in the section CLT current instantaneous value or _a mechanism of CLT ₂ or I ₁ i _2. The flexible electrical phase-separation device 10 without power failure in the sub-area can solve the problem of inaccurate detection of the pantograph position in the transition zone of the flexible automatic phase-separation device by adjusting the voltage, current amplitude and phase of the neutral section, and further Ensure that electric trains run smoothly through the phase-separated area without interruption, and fully adapt to the requirements of high-speed and heavy-load trains on the traction power supply system.

Further, in an embodiment of the feedback of this application, the terminal z of the rectifier-side converter VSC _a is connected to the lower port S-l2 of the circuit breaker S, and the terminal w of the rectifier-side converter VSC _a is connected to zero potential on the rail Dots connected. Inverter-side converter VSC _b , terminal x of inverter-side converter VSC _b is connected to the secondary winding terminal b ₂ of the single-phase isolation transformer T _T , and T _T secondary ports a ₂ and b _{2 are} connected to VSC The connection relations of the _b ports x and y can be interchanged, and the terminal y of the inverter-side converter VSC _b is connected to the zero potential point on the rail.

It will be appreciated that the sub side port T _T a ₂ and _{b 2} VSC b port x and y to the vertical connection relationship can be interchanged, secondary, and b ₂ a ₂ ports may be grounded isolation transformer T _T through the circuit breaker, or The upper and lower ports of S are connected to the power supply arm, and the ports x and y of VSC _b can be grounded or connected to the power supply arm through the upper and lower ports of the circuit breaker S.

Alternatively, if the isolation transformer T _{T is} composed of one isolation transformer, the primary winding port a _{1 of the} isolation transformer T _T and the rectifier converter BLQ ports x and z can be connected to the first power supply through the upper and lower ports of the circuit breaker S Either the arm or the second power supply arm. Among them, the first voltage sensor PT _{0 is} used to detect the instantaneous value of neutral voltage 0 to ground v ₀ ; the second voltage sensor PT _{1 is} used to detect the instantaneous value of the first power supply arm ground voltage v ₁ ; the third voltage sensor PT ₂ a second feeding section for detecting a ground voltage instantaneous value v _2; instantaneous value of the voltage between the fourth voltage sensor PT ₃ detects the inverter-side converter for a two-terminal VSC _b v _b.

Further, in the present application feedback one embodiment, the mechanism CLT ₁ (600) disposed partition coincides region _{MD. 1} outside AA 'section is in a partition electricity, and means CLT ₂ is provided in the partition power points coincide region MD _{2 At the} outer BB 'section.

Further, in an embodiment of the feedback of the present application, mechanism CLT ₁ (600) includes a first power supply arm, a first current sensor, a first feedthrough wire HL1 and a second feedthrough wire HL2, and mechanism CLT ₂ includes a The second power supply arm, the second current sensor, the third feed-through wire HL ₃ and the fourth feed-through wire HL ₄ .

Among them, the circuit breaker S (200) is a three-phase circuit breaker, which is isolated from the electrical split-phase contact network cable and the neutral section 0 during equipment maintenance, and isolates the device from the contact network cable when the device or contact network cable fails, Among them, the three upper ports of the circuit breaker S are connected to the power supply arm, and the three lower ports are connected to the isolation transformer _TT and the converter BLQ; the neutral section circuit breaker mechanism BK, which includes the neutral section 0 _1. Neutral section 0 ₂ and circuit breaker QF.

Further, in an embodiment of the feedback of the present application, wherein the current instantaneous value of the current is detected by the pantograph position and the current sensing mechanism CLT ₁ and the mechanism CLT ₂ and the converter current sensor CT ₀ , and the current instantaneous voltage is detected Whether the current value or the current instantaneous value is greater than a preset threshold to determine the position of the pantograph, and control the switching between the voltage control mode and the current control mode according to the pantograph position.

Wherein the isolation transformer T _T 1 isolation transformer may be constituted also by a combination of from 2 isolation transformer.

Further, in one embodiment of the feedback of the present application, it further includes: a neutral section circuit breaker mechanism BK. The mechanism BK includes a neutral section 0 ₁ , a neutral section 0 ₂ and a circuit breaker QF.

Further, in an embodiment of the feedback of the present application, both the voltage and current ramping algorithms are linear modulations, wherein during the voltage ramping process, the instantaneous value of the neutral voltage changes linearly; during the current ramping process, the converter The instantaneous value of the output current changes linearly.

In the related art, the "traction network electrical phase-separation uninterrupted flexible connection-compensation device and method" adjusts the voltage amplitude and frequency of the neutral section to make the traction pantograph voltage phase pull from the direction of the train. The power supply arm smoothly transitions to the neutral section of the split phase zone, and then smoothly transitions from the neutral section of the split phase zone to the traction power supply arm of the train running direction, which can ensure that the electric train runs smoothly through the split phase zone without power interruption. Most of the running time without locomotive passing through the electrical phase separation can also achieve comprehensive power quality management of negative sequence, reactive power and harmonics to the traction transformer. The "Comprehensive Compensation Device for Power Locomotive Over-Phase-Power Quality Comprehensive Compensation Device and Method" is also proposed through the combination of two single-phase isolation transformers and a two-phase "back-to-back" converter, which greatly saves the power electronic converter The power capacity, while obtaining the same locomotive passing electric phase separation effect, significantly reduces the engineering cost of the non-power-off over-phase separation equipment.

The uninterrupted over-phase separation schemes proposed in the related art all use a single-phase multi-winding transformer to realize the synthesis of the voltage of the two-phase “back-to-back” converter and the transformer to reduce the power capacity of the converter itself. In this way, the power capacity of the two-phase "back-to-back" converter is reduced to a certain extent, but because the converter still needs to bear the voltage difference between the power supply arms on both sides, the multiple modules included in the converter are mutually Series and parallel connection require a single-phase multi-winding transformer with a large number of secondary windings, and one of the secondary windings bears a large proportion of power capacity, which makes the single-phase multi-winding transformer with large total capacity and complicated winding, which is difficult to manufacture And cost is high. Related technologies also propose to use two multi-winding transformers and three-port "back-to-back" converters to achieve the same purpose, but the disadvantage is that the number of complex multi-winding transformers is increased by one, and the addition of a port to the converter makes its structure and The control complexity becomes higher.

Secondly, in the published literature of uninterrupted automatic over-phase equipment, as a necessary component of the pantograph position detection element, a shaft counting position sensor installed next to the rail is commonly used. The main problem of this type of method is that The axle counting position sensor does not always correspond to the locomotive pantograph position, especially in the case of one vehicle with multiple bows, it is difficult to accurately judge the position of the pantograph, and it is more difficult to ensure the flexible transition of the electric train in the electric phase separation area . This is a problem that needs to be solved by the core to realize a flexible non-power-off over-phase device.

Again, in the above-mentioned published literature of the automatic over-phase splitting device without power failure, the signal for determining that the locomotive pantograph enters and leaves the electric phase split coincidence area is determined by detecting the phase signal of the calculated current and voltage and its phase difference, etc. The problem is that it is difficult for existing phase-locked algorithms to achieve satisfactory levels in both phase-locked accuracy and phase-locked response speed, and it is more difficult to detect and control equipment. At the same time, in the above-mentioned published literature of non-power-off automatic over-phase equipment, the transition algorithm for the neutral segment voltage, or not disclosed, or the use of voltage phasor analysis and calculation methods, through the frequency shift of the voltage phasor The phase method gradually realizes the transition of the neutral section voltage from one side to the other side supply arm voltage. When this method is applied to the electrical phase separation of the subarea, since the phase difference of the power supply arms on both sides is usually very small, the phasor method based on the complete cycle definition requires higher precision and less flexibility in control.

Before or during the locomotive passing through the electric phase separation, it is difficult to effectively extinguish the arc after the pantograph is drawn by the failure of the electric phase separation equipment due to the failure of the electric phase separation equipment. At least one side of the power supply arm must be powered off to solve. The non-power-off flexible electrical phase-separation device fed by the application of the present application overcomes the above-mentioned shortcomings in the related art, and the specific embodiment of the non-power-off flexible electrical phase-separation device of the application provided by the application will be described in detail below.

As shown in FIG. 2 and FIG. 3, the electrical phase-separation of the zone includes a neutral segment 0, which coincides with MD ₁ and MD _{2 of the} power supply arms on both sides. In the feedback embodiment of this application, it includes: a two-phase “back-to-back” converter BLQ sharing a DC-side capacitor, a single-phase isolation transformer T _T , a pantograph position and a current sensing mechanism CLT ₁ , CLT ₂ , variable Current sensor CT ₀ , voltage sensors PT ₁ , PT ₂ , PT ₀ , PT ₃ and main circuit breaker S. The traction power supply arm 1 is connected to the remote traction substation 1, and the traction power supply arm 2 is connected to the remote traction substation 2.

Among them, in the specific embodiment 1 of the feedback of the present application, the two-phase “back-to-back” converter BLQ converters (VSC _a and VSC _b ) on both sides have a pair of output terminals, and the rectifier side converter VSC _a terminals z and w, the inverter-side two terminals of the VSC converter and x _b, respectively y, single-phase transformer the primary windings of the two terminals T _T a ₁ and b _1, two terminals of the secondary winding of a ₂ and b ₂ , where a ₁ and a ₂ are the same name end. The main circuit breaker S is a three-phase circuit breaker, the upper port 3 terminals are S-u1, S-u2 and S-u0, and the lower port 3 terminals are S-l1, S-l2 and S-l0.

As shown in FIG. 4, the third specific embodiment of the feedback of the present application further includes a neutral section circuit breaker mechanism BK, and the electrical phase-separating neutral section includes a neutral section 0 ₁ and a neutral section 0 ₂ . The terminal x of the inverter-side converter VSC _b of the two-phase "back-to-back" converter BLQ is connected to the secondary winding terminal b ₂ of the single-phase transformer T _T , and the terminal y is connected to the zero potential point (ground) on the rail connection. The rectifier side converter VSC _a terminal z of the two-phase “back-to-back” converter BLQ is connected to the lower port S-l2 of the main circuit breaker S, the upper port terminal S-u2 is connected to the power supply arm 2, and the terminal w is connected to the rail zero The potential points (ground) are connected. The primary winding terminal a _{1 of the} single-phase transformer T _{T is} connected to the lower terminal S-l1 of the main circuit breaker S, the upper terminal S-u1 is connected to the power supply arm 1, and the primary winding terminal b _{1 of the} single-phase transformer T _T is zero potential point is connected to a single-phase transformer T _T terminal of a secondary winding terminal S-l0 port connected to the main circuit breaker for ₂ S, S-u0 catchy terminal via converter current sensor CT ₀ 0 access neutral sections, The converter current sensor CT _{0 is} used to measure the current i ₀ output from the BLQ inverter-side converter VSC _b to the neutral section.

As shown in Figures 2 to 4, the pantograph position and the current sensing mechanism CLT _{1 are} located at the AA 'section outside the electrical phase-splitting area MD ₁ of the subarea. Between CLT ₁ and MD ₁ is the AC of the power supply arm 1' The interval, the length of which is not less than the distance d, to ensure that the time t _{d for the} train pantograph to pass the power supply arm 1 'at the fastest speed allowed is greater than the uninterrupted flexible electrical phase separation equipment of the electrical phase separation in the traction power supply system partition (UFEE) start response time t _r. CLT _{1 is} used to detect whether the current pantograph position is in the AD section of the power supply arm 1 ', and to measure the instantaneous value i ₁ of the current flowing through CT ₁ when the pantograph is in this section. The position of the pantograph and the current sensing mechanism CLT _{2 are} located at the BB 'section outside the electric phase-splitting area MD _{2 of the} divisional area. Between CLT ₂ and MD ₂ is the section BF of the power supply arm 2'. d, to ensure that the time t _{d for the} train pantograph to pass the power supply arm 2 'at the fastest speed allowed is greater than the start response time t _{r of} UFEE. The CLT _{2 is} used to detect whether the current pantograph position is in the BE section of the power supply arm 2 ', and to measure the instantaneous value i ₂ of the current flowing through the CLT ₂ when the pantograph is in the section. The voltage sensor PT _{1 is} used to measure the instantaneous value v _{1 of the} power supply arm 1 ′ to ground, the voltage sensor PT _{2 is} used to measure the instantaneous value v _{2 of the} power supply arm 2 ′ to ground, and the voltage sensor PT _{0 is} used to measure the neutral pair 0 pair the voltage instantaneous value v _0, a voltage sensor for measuring the PT ₃ BLQ converter inverter-side converter VSC _b both terminals x, v _b the value of the instantaneous voltage between y.

As shown in FIG. 5, the CLT ₁ includes a nearly parallel power supply arm 1 and a power supply arm 1 ′, a current sensor CT ₁ , and feedthrough wires HL ₁ and HL ₂ . Wherein, the power supply arm 1 includes a load-bearing cable 1, a contact network cable 1 and a suspension, and the power supply arm 1 'includes a load-bearing cable 1', a contact network cable 1 'and a suspension. The end of the contact wire 1 in the direction of the traction station 1 is tilted at point A 'with respect to the ground by a certain angle θ (θ is usually not more than 20 degrees), and the end of the contact wire 1' from MD ₁ is raised at point A with a certain angle θ relative to the ground. The network cable 1 and the contact network cable 1 'coincide in the AA' section along the direction of the power supply arm. The contact network cable 1 is fixed to the load-bearing cable 1 by suspension, and the contact network cable 1 'is fixed to the load-bearing cable 1' by suspension. The contact cable 1 and the contact cable 1 'are at the same level with the ground, and the contact cable 1 and the contact cable 1' The maximum parallel distance does not exceed the width of the pantograph. The two ends of the feedthrough wire HL ₁ are connected to the e ₁ point of the contact wire 1 and the f ₁ point of the contact wire 1 'respectively, and the _two ends of the feedthrough wire HL ₂ are respectively connected to the g ₁ point of the load cable 1 and the load wire 1 The h ₁ point of 'is connected, e ₁ , f ₁ , g ₁ , h ₁ are all located between A and A' along the direction of the power supply arm, and the feedthrough wires HL ₁ and HL ₂ both pass through the current sensor CT ₁ . The contact network cable 1 and the contact network cable 1 'are only electrically connected by HL ₁ , the load-bearing cable 1 and the load-bearing cable 1' are only electrically connected by HL ₂ , and the load-bearing cable 1 and the load-bearing cable 1 'do not pass through the cantilever that fixes them Institutional electrical connection.

As shown in FIG. 6, the CLT ₂ includes a nearly parallel power supply arm 2 and a power supply arm 2 ′, a current sensor CT ₂ , and feedthrough wires HL ₃ and HL ₄ . Wherein, the power supply arm 2 includes a load-bearing cable 2, a contact network cable 2 and a suspension, and the power supply arm 2 'includes a load-bearing cable 2', a contact network cable 2 'and a suspension. The end of the contact wire 2 in the direction of the traction station 2 is raised at an angle θ relative to the ground at point B ', and the end of the contact wire 2' from MD ₂ is raised at an angle θ ′ relative to the ground at point B. The contact wire 2 and the contact wire 2 ' Overlapping in the BB 'section along the direction of the power supply arm. The contact network cable 2 is fixed to the load-bearing cable 2 by suspension, and the contact network cable 2 'is fixed to the load-bearing cable 2' by suspension. The maximum parallel distance does not exceed the width of the pantograph. The two ends of the feedthrough wire HL ₃ are connected to the e ₂ point of the contact wire 2 and the f ₂ point of the contact wire 2 ', and the two ends of the feedthrough wire HL ₄ are respectively connected to the g ₂ point of the load cable 2 and the load wire 2 The h ₂ point of 'is connected, e ₂ , f ₂ , g ₂ and h ₂ are all located between B and B' along the direction of the power supply arm, and the feedthrough wires HL ₃ and HL ₄ both pass through the current sensor CT ₂ . The contact network cable 2 and the contact network cable 2 'are only electrically connected by HL ₃ , the load-bearing cable 2 and the load-bearing cable 2' are only electrically connected by HL ₄ , and the load-bearing cable 2 and the load-bearing cable 2 'do not pass through the cantilever that fixes them Institutional electrical connection.

Further, in the embodiment of the present application in the feedback, the second embodiment and the specific embodiment a particular embodiment except that: In the embodiment a particular embodiment, the single-phase isolation transformer T _T primary terminal via a ₁ S- main breaker 1 Connect the contact net 1, and the primary terminal b _{1 is} grounded. In a particular embodiment two, two single-phase transformer structure is a series combination of transformer T ₁ and T _2, respectively, to take power from the two transformers 1, 2 arms on both sides of power supply arm, in particular a transformer T is connected to _a primary terminal of a ₁ Connect the contact network cable 1 through the main circuit breaker S-1, the primary terminal b _{1 is} grounded, the secondary terminal a _{2 of the} transformer T ₁ is connected to the secondary terminal c _{2 of the} transformer, and the secondary terminal b _{2 is} connected to the inverter side converter VSC The port x of _b is connected; the primary terminal d _{1 of} the transformer T ₂ is connected to the contact network 2 via the main circuit breaker S-2, the primary terminal c _{1 is} grounded, and the secondary terminal d ₂ is connected to the main circuit breaker S-0 Neutral segment 0 is connected. This application of the feedback transformer T _T can take power from the primary side of the power arm, can take power from both sides simultaneously feeding section.

Specifically, the primary and secondary sides of the single-phase transformers T1 and T2 have a transformation ratio of 2: 1. In the power train when the phase of the maximum disparity in power by partition s _{L, T} T rated power capacity of s _T:

s _L = ks · s _T ,

Wherein, KS overload of the transformer T _T generally ks∈ [1,2].

Specifically, the capacities of the single-phase transformers T ₁ and T ₂ are both half of T _T.

Alternatively, the two-phase "back-to-back" converter BLQ sharing the DC-side capacitor may adopt the topology in the related art.

As shown in FIG. 7, in the specific embodiment 3 of the feedback of the present application, the BK includes a nearly parallel neutral section 0 ₁ and a neutral section 0 ₂ , and a circuit breaker QF. Among them, the neutral segment 0 ₁ includes the load-bearing cable 0 ₁ , the contact network cable 0 ₁ and the suspension, and the neutral segment 0 ₂ includes the load-bearing cable 0 ₂ , the contact network cable 0 ₂ and the suspension. Electrical phase of the overlap region MD ₁ direction catenary lines ₀₁ end at M relative to the ground bend angle θ, the electrical phase of the overlap region MD ₂ direction catenary line ₀₂ end of the ground bend angle [theta] at the N-point opposite. Catenary wire ₀₁ in the MN section coincident with ₀₂ in the neutral sections direction catenary line, catenary line ₀₁ through the suspension and the catenary ₀₁ is fixed, catenary wire ₀₂ is fixed by hanging the catenary _02, the contact cable ₀₁ and a height equal to the ground level ₀₂ and catenary lines, catenary wire ₀₁ and the catenary wire ₀₂ does not exceed the width of the maximum horizontal distance pantograph. The two ends of the circuit breaker QF are respectively connected to the point p of the contact network line 0 _{1 and} the point q of the contact network line 0 ₂ . The contact network cable 0 ₁ and the contact network cable 0 ₂ are only electrically connected by QF, and the load-bearing cable 0 ₁ and the load-bearing cable 0 ₂ are not electrically connected by a mechanism such as a cantilever fixing them.

Further, in the feedback embodiment of the present application, the main circuit breaker S is a three-phase circuit breaker, which is used for breaking and isolating the electrical phase-separated contact network line and the neutral section during equipment maintenance, and also used when the equipment or contact network line fails When the device is separated from the contact network cable, to protect the device and contact network cable.

The power-off flexible electrical phase-separation equipment in the feedback sub-zones of this application can be applied to the train pantograph from the power supply arm 1 passing through the electrical phase separation, or from the power supply arm 2 direction passing through the electrical phase separation.

As shown in FIG. 8, the process of the train pantograph moving from the traction power supply arm 1 to the traction power supply arm 2 is taken as an example to describe the control method of the flexible electrical phase-separation equipment without power failure in the feedback zoning of the present application. Specific steps are as follows:

1) When the train pantograph comes from the traction substation 1 and has not reached the point A of the power supply arm 1, UFEE runs in the standby state and detects the current signals of CLT ₁ and CLT ₂ ;

2) When UFEE detects the absolute value of CLT ₁ current signal | i ₁ | Meet:

| i ₁ |> i _th1

(Where i _th1 is the CLT ₁ position detection threshold, usually not more than 1% of the effective value of the locomotive pantograph load rated current), indicating that the train pantograph runs to the point A of the power supply arm 1 to the MD ₁ section, UFEE Switch from the standby mode to the voltage source control mode of the BLQ inverter-side converter VCS _b . The control goal is to make the neutral segment voltage v ₀ equal to the power supply arm 1 'voltage v ₁ , that is, the neutral segment 0 reference voltage v _ref0 Should meet:

v _ref0 = v ₁

In order to achieve the above purpose, the instantaneous reference voltage v _br between the terminals x and y of the BLQ inverter-side converter VSC _{b in the} above mode satisfies:

v _br = v ₁ -v ₀ + v _b

3) During VCS _b operation in the voltage source control mode, when the UFEE detects the absolute value of the CT ₀ current signal | i ₀ | satisfies:

| i ₀ |> i _th0

(In the formula, i _th0 is the mode switching current threshold, usually selected not to exceed 1% of the effective value of the locomotive pantograph load rated current), indicating that the pantograph has reached point C and entered the MD ₁ interval, and the current time is t ₀ , And immediately switch VCS _b from the voltage source mode to the incremental current source mode, so that the current i ₀ output from the inverter-side converter VSC _b to the neutral section is equal to the reference current signal i _ref0 . Then from the time t ₀ , the calculation method of the reference current i _ref0 is as follows:

In the incremental current source mode, measure the instantaneous values i ₁ and i _{0 of} CTL ₁ and CT ₀ respectively, and sum the instantaneous value i _{L of} pantograph load current to obtain

i _L = i ₁ + i ₀

Before the pantograph passes through the point D of the pantograph MD ₁ , the pantograph load current i _{L should} be smoothly transitioned from completely flowing through the power supply arm 1 ′ to completely flowing through the neutral section 0. Assuming that the minimum time for the pantograph to pass through the coincidence zone MD ₁ is T _s and the BLQ inverter-side output current i ₀ has elapsed from time t ₀ since time Δt _m has increased from 0 to i _L , then Δt _m should satisfy:

Δt _m <T _s

Then, the output current i _{ref0 of the} BLQ inverter-side converter VSC _b at time t can be expressed as:

i _ref0 = k _I1 · i _L , (0≤k _I1 ≤1)

Where, k _I1 = (tt ₀ ) / Δt _m , t∈ [t ₀ , t ₀ + Δt _m ]

When t> t ₀ + Δt _m , the pantograph load current i _L has completely transitioned from flowing through the power supply arm 1 ′ to flowing through the neutral section 0, the reference current of the BLQ inverter side converter meets:

i _ref0 = i _L

During 4) VCS _b incremental current source operating in control mode, when the power supply is detected UFEE arm 1 'the absolute value of the voltage difference Δv between the voltage v and the voltage v _{0 1} 0 neutral sections ₀₁ v exceeds the threshold value _TH, which is:

| Δv ₀₁ |> v _th

(In the formula, v _th is the mode switching voltage threshold), indicating that the pantograph has passed the point D and left the MD ₁ interval. Record the current time t ₁ , and immediately switch VCS _b from the incremental current source mode to the voltage source mode. The voltage source mode control goal is to make the neutral segment voltage v ₀ equal to the power supply arm 1 ′ voltage v ₁ and directly transition To equal the voltage v _{2 of the} power supply arm 2 '.

Specifically, during the linear transition of the instantaneous voltage value, it can be specified that the neutral voltage v ₀ starts to change from time t ₁ , and the elapsed time Δt ₀ reaches the voltage v _{2 of the} power supply arm 2 ′.

The difference between the instantaneous voltage values of the power supply arm 1 'and the power supply arm 2' is:

Δv = v ₂ -v ₁

Then from time t ₁ , the reference voltage v _{ref0 of the} neutral segment 0 should meet:

v _ref0 = v ₁ + k _V · Δv (0≤k _V ≤1)

In order to achieve the above purpose, the instantaneous reference voltage v _br between the terminals x and y of the BLQ inverter-side converter VSC _{b in} this mode satisfies:

v _br = v _ref0 -v ₀ + v _b = v ₁ -v ₀ + v _b + k _V · Δv

Among them, k _V can be expressed as:

k _V = (tt ₁ ) / Δt ₀ , t∈ [t ₁ , t ₁ + Δt ₀ ]

When t> t ₁ + Δt ₀ , the neutral voltage v ₀ is equal to the power arm 2 ′ voltage v ₂ , and the BLQ inverter-side output voltage reference value is maintained as:

v _ref0 = v ₂

In order to achieve the above purpose, the instantaneous reference voltage v _br between the terminals x and y of the BLQ inverter-side converter VSC _{b in the} above mode satisfies:

v _br = v ₂ -v ₀ + v _b

If the minimum time for the pantograph to pass through the central segment 0 is T ₀ , then Δt ₀ should satisfy:

Δt ₀ <T ₀

5) When the absolute value of the CLT2 current signal is detected | i ₂ | Meet:

| i ₂ |> i _th2

(In the formula, i _th2 is the CLT ₂ position detection threshold, usually not more than 1% of the effective value of the locomotive pantograph load rated current), indicating that the pantograph position moves from the neutral section 0 to point E and enters the MD ₂ section. Record as time t ₂ and immediately record VCS _b

Switching from the voltage source mode to the decrement current source mode makes the current i ₀ output from the inverter-side converter VSC _b to the neutral section equal to the reference current signal i _ref0 .

In the reduced current source mode, the instantaneous values of currents i ₂ and i _{0 of} CTL ₂ and CT ₀ are measured respectively, and the sum can obtain the instantaneous value of the pantograph load current i _L , that is:

i _L = i ₂ + i ₀

Before the pantograph passes the point F of the pantograph coincidence zone MD ₁ , it is necessary to ensure that the pantograph load current i _L smoothly transitions from completely flowing through the neutral section 0 to completely flowing through the power supply arm 2 '. Due to the symmetry, is still referred to by the pantograph _m should be a minimum time for the overlap region MD ₂ T _s, and the inverter-side BLQ output current I ₀ from time t ₂ has elapsed from the time [Delta] t _m i _L reduced to 0, the same [Delta] t Satisfy:

Δt _m <T _s

Then the reference current i _ref0 output from the BLQ inverter-side converter VSC _b from time t ₂ can be expressed as:

i _ref0 = (1-k _I2 ) * i _L , (0≤k _I2 ≤1)

Where, k _I2 = (tt ₂ ) / Δt _m , t∈ [t ₂ , t ₂ + Δt _m ]

When t> t ₂ + Δt _m , the pantograph load current i _L has completely transitioned from flowing through the neutral section 0 to flowing through the power supply arm 2 ′, the reference current of the BLQ inverter side converter meets:

i _ref0 = 0

6) When UFEE detects that CLT ₂ current has continuous k cycles (k≥1) less than the threshold value i _th2 , it indicates that the pantograph has passed the B 'point, exited the CLT ₂ detection area EB', entered the power supply arm 2 section and away from the partition When the power is split, UFEE returns to standby mode.

Among them, the working state of each sensor is detected in the UFEE standby state, and the BLSC rectifier side converter VSC _a works normally to control the stability of the common DC bus voltage to ensure that the UFEE pantograph position and current sensing mechanism CLT ₂ and CLT ₁ detect power reception. After the bow position, UFEE can respond quickly, and the inverter side converter VSC _b pulse is blocked to reduce the equipment loss.

In the UFEE voltage source control mode, the UFEE controls the BLQ inverter-side converter VSC _b output voltage v _{b to} track the reference voltage v _br so that v _b and v _{br are} nearly equal. In UFEE incremental or decrement current source control mode, UFEE controls the output current i _{0 to} track the reference current i _ref0 so that i ₀ and i _{ref0 are} nearly equal.

Further, in the third embodiment of the feedback provided by the present application, the function of the circuit breaker mechanism BK is: due to the UFEE device withdrawing from operation, the locomotive pantograph charged hard to break through the neutral section 0 hours caused by the arcing problem, or the UFES device is running During the process, the pantograph arcing problem caused by the failure of the UFEE control or the short-circuit fault of the traction power supply system caused the arcing problem during the panning of the pantograph. The BK immediately cut off the QF and waited for the arc to extinguish or After the fault is cleared, re-close the QF.

Further, in the feedback embodiment of the present application, whether there is an arc in the coincidence zones MD ₁ and MD ₂ can be determined by flowing through the position of the CLT ₁ or CLT ₂ and the duration of the current signal. When the self-CLT ₁ Δt or CLT ₂ is first detected to the locomotive pantograph current position signal, CLT ₁ or CLT ₂ to a position signal disappears current elapsed time _f satisfy:

Δt _f > T ₀

It means that the arc is drawn and BK is immediately cut off.

In summary, as shown in FIG. 9, the specific parameters will be designed using the specific example one feedback from this application as an example. Among them, the maximum speed of the train is 350 km / h, and the MD ₁ and MD ₂ of the coincidence zone are ₂ m. The minimum time T _{s of} the train pantograph passing through the coincidence areas MD ₁ and MD ₂ = 200206s, and the minimum time T ₀ = 2.06s of the pantograph passing through the neutral section 0 can be calculated for the sexual section 200m. In the MD ₁ interval current incremental control mode, the BLQ inverter-side output can be selected to increase from 0 to i _L after Δt _m = 0.02s. In the MD ₂ current decrement control mode, the BLQ inverter-side output can be selected to decrease from i _L to 0 after Δt _m = 0.02s. In the neutral voltage control mode, Δt ₀ = 0.2s can be selected, that is, v ₀ passes 10 cycles, that is, the transition from v ₁ to v ₂ .

The selection of voltage and current thresholds should not only ensure the measurement sensitivity, but also prevent misoperation under various disturbances, which need to be determined according to the specific conditions of the load current of the electric locomotive and the disturbance current. The specific example of feedback in this application selects CLT ₁ position detection threshold i _th1 = 2A, mode switching current threshold i _th0 = 2A, mode switching voltage threshold v _th = 100V, and CLT ₂ position detection threshold i _th2 = 2A.

The characteristics and beneficial effects of feedback from this application are as follows:

The feedback embodiment of the present application adopts the method of combining the voltage of the “back-to-back” converter and the transformer to reduce the power capacity of the converter itself. In this way, the power capacity of the two-phase “back-to-back” converter is to a certain extent To be lowered.

The feedback embodiment of the present application utilizes the pantograph position and current sensing mechanism, voltage sensor, current sensor to accurately supply the instantaneous value of the voltage and current of the neutral arm, and judges the pantograph position by threshold control, thereby achieving fast and accurate control mode Switch. Relative to the commonly used axle counting position sensor installed next to the rail, the axle counting position sensor does not always correspond to the locomotive pantograph position, especially in the case of a vehicle with multiple bows, it is difficult to achieve the pantograph position Accurate judgment, the feedback embodiment of the present application can more accurately detect the position of the pantograph, and ensure the rapid and accurate control of the train over-phase.

When the pantograph is in the neutral section, the feedback embodiment of the present application linearly modulates the neutral section voltage in the voltage source control mode, continuously changes the voltage amplitude and phase of the electrical phase-separating neutral section within a certain power frequency cycle, and realizes flexibility The neutral phase voltage has no phase change when power is cut off. When the pantograph is in the coincidence zone, the application feedback current linear modulation in the current source control mode, to ensure accurate and rapid linear increase or decrease of BLQ output current, flexible to achieve neutral section, power supply arm current changes, to ensure that the current does not change suddenly To avoid arcing the device. Compared with the existing transition algorithm, the linear modulation control method is simple and accurate, and the response speed is fast.

In summary, according to the embodiment of the feedback embodiment of the present application, the zonal uninterruptible flexible electrical phase separation equipment can adjust the voltage and current amplitude and phase of the neutral section to make the traction pantograph smoothly pull from the direction of the train. The power supply arm smoothly transitions to the neutral section of the phase separation area, and then smoothly transitions from the neutral section of the phase separation area to the traction power supply arm of the train running direction, solving the problem of flexible automatic over-phase separation device. The lack of inaccurate detection can ensure that electric trains pass through the phase-separation area smoothly and without interruption, fully adapting to the requirements of high-speed and heavy-load trains on the traction power supply system without the need for ground position sensors and phase-locking of voltage and current signals Calculation and phasor calculation, and when the equipment failure causes the electrical split phase to draw the arc, the arc can be effectively extinguished without the power supply arm being powered off.

Another embodiment of the feedback of this application proposes a control method for flexible electrical phase separation without power interruption of a partition, using the flexible electrical phase separation equipment without power interruption as described above, wherein the method includes: detecting the instantaneous voltage at each point Value; control the pantograph of the train from the first power supply arm to pass through the electrical phase separation, and from the direction of the second power supply arm to pass through the electrical phase separation; detect the inverter side converter VSC _{b of the} converter BLQ to neutral output current phase 0 i _0; detecting the current position of the pantograph is located corresponding to the segment AD, _{i. 1} and detected by means or i CLT current instantaneous value flowing through the pantograph mechanism located within the section ₂ of CT ₁ or _2.

According to the embodiment of the feedback embodiment of the present application, there is no power failure flexible electric phase separation control method, which solves the problem of inaccurate detection of the pantograph in the transition area in the flexible automatic over-phase separation, and the detection of the pantograph position can ensure that the electric train is stable and Drive through the phase-separation area, fully adapt to the requirements of high-speed and heavy-load trains on the traction power supply system, without the need for ground position sensors, no need for phase-locked calculation and phasor calculation of voltage and current signals, and when the equipment fails When splitting the arc, the arc can be effectively extinguished without the power supply arm being powered off.

In the description of the feedback of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Rear", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "Radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, only for the convenience of describing the feedback and simplifying the description of this application, rather than indicating or implying the device Or the element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the feedback of this application.

In addition, the terms “first” and “second” are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined with "first" and "second" may include at least one of the features either explicitly or implicitly. In the description of the feedback of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

In the feedback of this application, unless otherwise clearly specified and limited, the terms "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be fixed or detachable Connected, or integrated; may be mechanical connection or electrical connection; may be directly connected, or may be indirectly connected through an intermediary, may be the connection between two elements or the interaction between two elements, unless otherwise Clearly defined. For those of ordinary skill in the art, the specific meaning of the above terms in the feedback of this application can be understood according to specific circumstances.

In the feedback of this application, unless otherwise clearly stipulated and defined, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are through an intermediary Indirect contact. Moreover, the first feature is “above”, “above” and “above” the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is "below", "below", and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontal than the second feature.

In the description of this specification, the description referring to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means specific features described in conjunction with the embodiment or examples , Structure, materials or characteristics are included in at least one embodiment or example of feedback in this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradicting each other, those skilled in the art may combine and combine different embodiments or examples and features of the different embodiments or examples described in this specification.

Although the embodiments of the feedback of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limitations on the feedback of the present application. Those of ordinary skill in the art are within the scope of the feedback of the present application Variations, modifications, replacements, and variations can be made to the above embodiments.

Claims (10)

1. A flexible electrical phase-separation device without power interruption in a partition, characterized in that it includes:

   Isolation transformer T _T S and a main breaker;

   The first voltage sensor PT ₀ to the fourth voltage sensor PT _{3 are} used to detect the instantaneous voltage value of each point;

   A two-phase back-to-back converter BLQ sharing a DC-side capacitor, the converter BLQ includes a rectifier-side converter VSC _a and an inverter-side converter VSC _b for the train pantograph to drive from the first power supply arm Coming through the electrical phase separation and driving from the direction of the second power supply arm through the electrical phase separation;

   The converter current sensor CT _{0 is} used to detect the current i ₀ output from the inverter-side converter VSC _{b of the} converter BLQ to the neutral section ₀ ; and

   The pantograph position and current sensing mechanism CLT ₁ and mechanism CLT _{2 are} used to detect whether the current pantograph position is located in the corresponding AD interval, and to detect whether the pantograph is in the interval and flows through the mechanism CLT ₁ or all The instantaneous current value i ₁ or i _{2 of the} mechanism CLT ₂ is described.
2. The zonal uninterruptible flexible electrical phase separation device according to claim 1, wherein,

   Rectifier-side converter VSC _a , the terminal z of the rectifier-side converter VSC _a is connected to the lower port S-l2 of the main circuit breaker S, and the terminal w of the rectifier-side converter VSC _a is connected to the rail Zero potential point connection;

   Inverter-side converter VSC _b , the terminal x of the inverter-side converter VSC _b is connected to the secondary winding terminal b ₂ of the isolation transformer T _T , and the T _T secondary ports a ₂ and b _{2 are} connected to VSC The connection relationship between the _b ports x and y can be interchanged, and the terminal y of the inverter-side converter VSC _b is connected to the zero potential point on the rail.
3. The zoning-free flexible electrical phase separation device according to claim 1, wherein the isolation transformer _{TT is} composed of one isolation transformer, and the isolation transformer _TT primary winding port a ₁ and The BLQ ports x and z of the converter can be connected to any one of the first power supply arm or the second power supply arm through the upper and lower ports of the circuit breaker S.
4. The flexible electrical phase-separation device without power-off according to claim 1 or 3, wherein the first voltage sensor PT _{0 is} used to detect the instantaneous value v _{0 of} the neutral section 0 to ground voltage;

   The second voltage sensor PT _{1 is} used to detect the instantaneous value v _{1 of the} voltage of the first power supply arm to ground;

   The third voltage sensor PT _{2 is} used to detect the instantaneous voltage v _{2 of the} second power supply arm to ground;

   A fourth voltage sensor PT ₃ for a voltage instantaneous value v _b between the detecting inverter converter VSC _b-side two terminals.
5. The zonal power supply flexible electrical phase separation device according to claim 1, wherein the mechanism CLT _{1 is} disposed at an AA 'section outside the zonal power phase separation coincidence area MD ₁ and the mechanism CLT ₂ It is set at the BB 'section outside the MD ₂ overlapping area of the electrical division of the district.
6. The zonal uninterruptible flexible electrical phase separation device according to claim 1, wherein the mechanism CLT ₁ includes the first power supply arm, the first current sensor, the first feedthrough wire HL1 and the second feedthrough The core wire HL2, and the mechanism CLT ₂ includes the second power supply arm, the second current sensor, the third core wire HL ₃ and the fourth core wire HL ₄ .
7. The zonal uninterrupted flexible electrical phase separation equipment according to claim 6, characterized in that the circuit breaker S is a three-phase circuit breaker to contact the network line and the neutral section with the electrical phase separation during equipment maintenance 0 breaking isolation, and breaking and isolating the device from the contact network cable when the device or the contact network cable fails, wherein the 3 upper ports of the circuit breaker S are connected to the power supply arm and 3 lower ports connected to the isolation transformer T _T and the converter BLQ; neutral sections breaker mechanism BK, BK said mechanism ₀₁ comprises a neutral section ₀₂ and the circuit breaker QF neutral sections.
8. The zonal uninterruptible flexible electrical phase separation device according to claim 1, wherein the pantograph position and current sensing mechanism CLT ₁ and mechanism CLT ₂ and the converter current sensor CT ₀ Detect the current instantaneous value, and detect whether the current voltage instantaneous value, current current instantaneous value and current voltage difference are greater than a preset threshold to determine the pantograph position, and control the voltage control mode and current according to the pantograph position Switch between control modes.
9. The flexible electrical phase-separation device with no power-off of the subarea according to claim 1, characterized in that

   Both the voltage and current ramping algorithms are linear modulations, where the instantaneous value of the neutral voltage changes linearly during the voltage slowing process; during the current slowing process, the instantaneous value of the converter output current changes linearly.
10. A control method for flexible electrical phase separation without power interruption of a partition, characterized by adopting a flexible electrical phase separation device without power interruption of a partition according to any one of claims 1-9, wherein the method comprises:

    Detect the instantaneous value of voltage at each point;

    Control the pantograph of the train from the first power supply arm to pass through the electrical phase separation, and from the direction of the second power supply arm to pass through the electrical phase separation;

    Detecting the current i ₀ output from the inverter-side converter VSC _{b of the} converter BLQ to the neutral section ₀ ; and

    It is detected whether the current pantograph position is in the corresponding AD interval, and the instantaneous value i ₁ or i ₂ of the current flowing through the mechanism CLT ₁ or the mechanism CLT ₂ when the pantograph is in the interval is detected.

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