CN109510213B - In-phase power supply comprehensive compensation device and method based on traction-compensation transformer - Google Patents
In-phase power supply comprehensive compensation device and method based on traction-compensation transformer Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims abstract description 13
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- 230000001939 inductive effect Effects 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 4
- 238000011069 regeneration method Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 3
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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
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- 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
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Abstract
The invention discloses an in-phase power supply traction substation comprehensive compensation device and method based on a traction-compensation transformer, and relates to the technical field of AC electric railway power supply. The in-phase power supply traction substation comprehensive compensation device comprises a first reactive compensation unit, a second reactive compensation unit, a third reactive compensation unit, a fourth reactive compensation unit and a measurement and control unit; the first passive compensation unit is connected between an r 'terminal and an s' terminal of the secondary side of the traction-compensation transformer; the first reactive compensation unit, the second reactive compensation unit, the third reactive compensation unit and the fourth reactive compensation unit are respectively connected with the measurement and control unit. In addition, a comprehensive compensation method of the in-phase power supply traction substation based on the traction-compensation transformer is also disclosed. Therefore, the invention not only can effectively cancel the electric split phase at the outlet of the in-phase power supply traction substation to realize in-phase power supply, but also can effectively solve the technical problem of real-time compensation of reactive power and negative sequence generated by the in-phase power supply traction substation.
Description
Technical Field
The invention relates to the field of AC electric railway power supply, in particular to a reactive power and negative sequence comprehensive compensation technology of an in-phase power supply traction substation based on a traction-compensation transformer.
Background
The electrified railway generally adopts a single-phase power frequency alternating current system powered by a public power system, and adopts a scheme of alternating phase sequence, split phase and partitioned power supply in order to ensure that single-phase traction load is distributed in a three-phase power system as balanced as possible. Adjacent power supply areas at the split-phase areas are isolated by a split-phase insulator to form electric split-phase, which is called split-phase for short. The electric split phase link is the weakest link in the whole traction power supply system, and the train is split excessively to become the bottleneck of traction power supply of a high-speed railway and even the whole electrified railway.
Theory and practice show that the single-phase traction transformer or the combined type in-phase power supply technology adopted in the traction substation can cancel the electric split phase at the outlet of the traction substation, and the bilateral communication technology adopted in the subarea can cancel the electric split phase at the outlet of the traction substation, so that the power supply bottleneck is eliminated, and the railway power supply capacity and the railway transportation capacity are improved. But the core of the method realizes negative sequence compensation by changing the active power flow of the traction substation, so that the negative sequence reaches the standard.
The invention does not change the active power flow of the traction substation, solves the technical problem of comprehensive compensation of reactive power and negative sequence of the traction substation through reactive power flow control, realizes in-phase power supply, improves the power factor and the feeder voltage, and ensures that the negative sequence treatment meets the national standard requirement.
Disclosure of Invention
The invention aims to provide an in-phase power supply comprehensive compensation device and method based on a traction-compensation transformer, which not only can realize in-phase power supply, but also can effectively solve the technical problem of reactive power and negative sequence comprehensive real-time compensation generated by an in-phase power supply traction substation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the in-phase power supply comprehensive compensation device based on the traction-compensation transformer is arranged in an in-phase power supply traction substation, and the in-phase power supply traction substation mainly comprises a three-phase high-voltage bus, the traction-compensation transformer connected with the three-phase high-voltage bus and a feeder connected with the traction-compensation transformer; wherein: the comprehensive compensation device comprises a first reactive compensation unit, a second reactive compensation unit, a third reactive compensation unit, a fourth reactive compensation unit and a measurement and control unit; the first reactive compensation unit is connected between an r 'terminal and an s' terminal of the traction-compensation transformer secondary side, the second reactive compensation unit is connected between an r terminal and a t terminal of the traction-compensation transformer secondary side, the third reactive compensation unit is connected between an s terminal and a t terminal of the traction-compensation transformer secondary side, and the fourth reactive compensation unit is connected between an r terminal and an s terminal of the traction-compensation transformer secondary side; the first reactive compensation unit, the second reactive compensation unit, the third reactive compensation unit and the fourth reactive compensation unit are respectively connected with the measurement and control unit.
Preferably, the comprehensive compensation device further comprises a measurement and control unit, wherein the measurement and control unit mainly comprises a voltage transformer, a current transformer and a controller; the input end of the controller is respectively connected with the measuring ends of the voltage transformer and the current transformer, and the output end of the controller is respectively connected with the control ends of the first reactive compensation unit, the second reactive compensation unit, the third reactive compensation unit and the fourth reactive compensation unit.
Preferably, the primary side of the voltage transformer is connected between the feeder line and the ground in parallel, and the primary side of the current transformer is connected on the feeder line in series.
Preferably, primary terminals R, S, T of the traction-compensation transformers are respectively connected with ABC three phases of the three-phase high-voltage bus; and the r 'terminal of the secondary r's 'winding of the traction-compensation transformer is led to the traction network to be connected through a feeder line, and the s' terminal of the secondary r's' winding of the traction-compensation transformer is grounded.
In order to solve the technical problem, a further technical scheme adopted by the invention is as follows:
a comprehensive compensation method of the in-phase power supply comprehensive compensation device based on the traction-compensation transformer according to any one of the above technical schemes, wherein: the method for comprehensively compensating the in-phase power supply comprises the following specific steps:
(1) Let the negative sequence allowable capacity of the three-phase high-voltage bus be S ε ；
(2) The controller firstly calculates traction load (apparent) power s and power factor of the traction load as cos phi through using voltage and current respectively measured by a voltage transformer and a current transformer at time t, and then absorbs reactive power Q for a first passive compensation unit according to target traction load power factor or target feeder voltage 1 Control and compensate, and Q 1 The capacitance is positive; at this time, Q 1 Negative sequence power s generated by sum s - Is of the size of
(3) Judgment of Q 1 Negative sequence power s generated by sum s - And negative sequence allowable capacity S of three-phase high-voltage bus ε The magnitude relation between the two reactive power compensation units is compensated by controlling the second reactive power compensation unit, the third reactive power compensation unit and the fourth reactive power compensation unit to absorb reactive power through the controller, wherein the absorption reactive power of the second reactive power compensation unit, the third reactive power compensation unit and the fourth reactive power compensation unit is Q respectively 2 、Q 3 、Q 4 。
Preferably, when s - ≤S ε When the reactive power compensation unit is in the first state, the controller controls the second reactive power compensation unit, the third reactive power compensation unit and the fourth reactive power compensation unit to absorb reactive power for compensation, and Q 2 ＝Q 3 ＝0，Q 4 ＝-kQ 1 ，
I.e. reactive power Q 1 When capacitive, Q 4 Is inductive, wherein k is less than or equal to 1, and k is a real number.
Preferably, when s - ＞S ε When the controller controls the second reactive power compensation unit and the third reactive power compensation unit to absorb reactive power for compensation, wherein Q 2 、Q 3 And Q 4 The component sizes of (2) are respectively:
Q 4 maintain unchanged, set->
Further preferably, when the feeder is in traction condition, Q 2 Is inductive, Q 3 The component of (2) is capacitive.
Further preferably, when the feed line is in the regeneration mode, Q 2 The components of (2) being capacitive, Q 3 The component of (2) is perceptual.
Compared with the prior art, the invention has the beneficial effects that:
1. the reactive power compensation unit of the in-phase power supply integrated compensation device and the method thereof can comprehensively generate reactive power components and negative sequence components, realize in-phase power supply, comprehensively compensate power factors, feeder voltage and negative sequence, do not change the active power flow of a traction network of a traction substation, and the in-phase power supply integrated compensation device does not transmit positive sequence active power, thereby having the technical advantage of no-payment of capacity electric charge.
2. The working condition of the reactive compensation unit of the in-phase power supply integrated compensation device and the method thereof is reversible, and when the feeder line is in an equivalent regeneration working condition, the electric energy reaching the standard can still be sent to the power grid.
3. Simple structure, excellent performance, advanced technology, reliable method and easy implementation.
Drawings
Fig. 1 is a schematic structural diagram of an in-phase power supply integrated compensation device according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a relationship structure between the measurement and control unit and the reactive compensation unit according to an embodiment of the present invention.
Fig. 3 is a flow chart of an in-phase power supply integrated compensation method according to a second embodiment of the invention.
Detailed Description
For a better understanding of the invention, the working principle of the invention is briefly described here: the traction power factor and the feeder voltage are compensated by a first passive compensation unit connected between an r 'terminal and an s' terminal of the secondary side of the traction-compensation transformer, so that the traction power factor and the feeder voltage reach target requirements; the method comprises the steps of taking a three-phase high-voltage bus as a negative sequence standard test point, correcting excessive reactive power output of a first reactive power compensation unit through a fourth reactive power compensation unit connected between a secondary side r terminal and an s terminal of a traction-compensation transformer, compensating negative sequence current (power) jointly generated by traction load and the first reactive power compensation unit through reactive power output of a second reactive power compensation unit connected between the r terminal and the t terminal and a third reactive power compensation unit connected between the s terminal and the t terminal, and achieving national standard requirements after compensation, wherein the second reactive power compensation unit and the third reactive power compensation unit generate negative sequence power flow without changing original active power flow. The invention is further described below with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, an embodiment of the present inventionThe in-phase power supply comprehensive compensation device based on the traction-compensation transformer is arranged in an in-phase power supply traction substation SS, and the in-phase power supply traction substation SS mainly comprises a three-phase high-voltage bus HB, a traction-compensation transformer TT connected with the three-phase high-voltage bus HB and a feeder F connected with the traction-compensation transformer TT; wherein: the comprehensive compensation device comprises a first passive compensation unit SVG 1 Second reactive power compensation unit SVG 2 Third reactive power compensation unit SVG 3 SVG (reactive power compensation) unit 4 And a measurement and control unit MC; the first passive compensation unit SVG 1 The second reactive compensation unit SVG is connected between the r 'terminal and the s' terminal of the TT secondary side of the traction-compensation transformer 2 The third reactive compensation unit SVG is connected between the r terminal and the t terminal of the TT secondary side of the traction-compensation transformer 3 The fourth reactive compensation unit SVG is connected between the s terminal and the t terminal of the TT secondary side of the traction-compensation transformer 4 The traction-compensation transformer is connected between an r terminal and an s terminal of the TT secondary side of the traction-compensation transformer; the first passive compensation unit SVG 1 Second reactive power compensation unit SVG 2 Third reactive power compensation unit SVG 3 And a fourth reactive compensation unit SVG 4 And are respectively connected with the measurement and control units MC.
In the embodiment of the invention, primary side terminals R, S, T of the traction-compensation transformer are respectively connected with ABC three phases of the three-phase high-voltage bus HB; and an r 'terminal of the r's 'winding of the secondary side of the traction-compensation transformer is led to the traction network OCS through a feeder F to be connected, and an s' terminal of the r's' winding of the secondary side of the traction-compensation transformer is grounded. The traction network OCS powers the train LC. The specific structure of the traction-compensation transformer can be found in the literature of chinese patent application No. CN201811061327.4, and will not be described in detail herein. In the embodiment of the invention, the primary side of the voltage transformer PT is connected between the feeder line F and the ground in parallel, and the primary side of the current transformer CT is connected on the feeder line F in series.
As shown in fig. 2, in the embodiment of the present invention, the measurement and control unit MC is mainly composed of a voltage transformer PT, a current transformer CT and a controller CD; the input ends of the controller CD are respectively connected withThe measuring ends of the voltage transformer PT and the current transformer CT are connected, and the CD output end of the controller is respectively connected with the first passive compensation unit SVG 1 Second reactive power compensation unit SVG 2 Third reactive power compensation unit SVG 2 SVG (reactive power compensation) unit 4 Is connected with the control end of the control circuit.
Example two
As shown in fig. 3, an embodiment of the present invention provides a comprehensive compensation method using the in-phase power supply comprehensive compensation device based on a traction-compensation transformer according to any one of the above technical solutions, where: the method for comprehensively compensating the in-phase power supply comprises the following specific steps:
(1) Let the negative sequence allowable capacity of the three-phase high-voltage bus HB be S ε ；
(2) The controller CD calculates the traction load (apparent) power s passing through the feeder F and the power factor thereof as cos phi by utilizing the voltage and the current respectively measured by the voltage transformer PT and the current transformer CT at the moment t, and then the controller CD calculates the first passive compensation unit SVG according to the target traction load power factor or the target feeder voltage 1 Absorbing reactive power Q 1 Control and compensate, and Q 1 The capacitance is positive; at this time, Q 1 Negative sequence power s generated by sum s - Is of the size of
(3) Judgment of Q 1 Negative sequence power s generated by sum s - And negative sequence allowable capacity S of three-phase high-voltage bus HB ε The magnitude relation between the two reactive compensation units is controlled by a controller CD to control a second reactive compensation unit SVG 2 Third reactive power compensation unit SVG 3 SVG (reactive power compensation) unit 4 Absorb reactive power for compensation, wherein a second reactive compensation unit SVG 2 Third reactive power compensation unit SVG 3 SVG (reactive power compensation) unit 4 The absorption reactive power of (a) is Q respectively 2 、Q 3 、Q 4 。
In the embodiment of the invention, when s - ≤S ε When the controller CD controls the second reactive compensation unit SVG 2 Third reactive power compensation unit SVG 3 SVG (reactive power compensation) unit 4 Absorb reactive power to compensate, and Q 2 ＝Q 3 ＝0，Q 4 ＝-kQ 1 Reactive power Q 1 When capacitive, Q 4 Is inductive, wherein k is less than or equal to 1, and k is a real number.
In the embodiment of the invention, when s - ＞S ε When the controller CD controls the second reactive compensation unit SVG 2 Third reactive power compensation unit SVG 3 Absorb reactive power to compensate, wherein when the feeder F is in traction condition, Q 2 Is inductive, Q 3 The component of (2) is capacitive; when the feeder line F is in the regeneration working condition, Q 2 The components of (2) being capacitive, Q 3 The component of (2) is perceptual; wherein Q is 2 、Q 3 And Q 4 The component sizes of (2) are respectively:Q 4 maintain unchanged, set->
Claims (7)
1. The in-phase power supply comprehensive compensation device based on the traction-compensation transformer is arranged in an in-phase power supply traction substation (SS), and the in-phase power supply traction substation (SS) mainly comprises a three-phase high-voltage bus (HB), a traction-compensation transformer (TT) connected with the three-phase high-voltage bus (HB) and a feeder line (F) connected with the traction-compensation transformer (TT); the method is characterized in that: the integrated compensation device comprises a first passive compensation unit (SVG) 1 ) Second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Fourth reactive compensation unit (SVG) 4 ) And a measurement and control unit (MC); the first passive compensation unit (SVG 1 ) Is connected between the r 'terminal and the s' terminal of the secondary side of the traction-compensation transformer (TT), the second reactive compensation unit (SVG 2 ) Connected between the r terminal and the t terminal of the secondary side of the traction-compensation transformer (TT), the third reactive compensationUnit (SVG) 3 ) Is connected between the s terminal and the t terminal of the secondary side of the traction-compensation transformer (TT), the fourth reactive compensation unit (SVG) 4 ) The r terminal and the s terminal are connected between the secondary side of the traction-compensation transformer (TT); the first passive compensation unit (SVG 1 ) Second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) And a fourth reactive compensation unit (SVG) 4 ) Are respectively connected with the measurement and control units (MC);
the traction-compensation transformer comprises two single-phase iron cores and windings, wherein a first primary winding (RS), a first secondary winding (RS) and a second secondary winding (r's') are wound on one single-phase iron core, and a second primary winding (TX) and a third secondary winding (TX) are wound on the other single-phase iron core; an X terminal of the second primary winding (TX) is connected with the midpoint of the first primary winding (RS); the x terminal of the third secondary winding (tx) is connected with the midpoint of the first secondary winding (rs); the T terminal of the second primary winding (TX) and the T terminal of the third secondary winding (TX) are homopolar ends, and the R terminal of the first primary winding (RS) and the R terminal of the first secondary winding (RS) and the R ' terminal of the second secondary winding (R's ') are homopolar ends; the second secondary winding (r's') and the first primary winding (RS) form a single-phase wiring transformer;
the primary side terminals R, S, T of the traction-compensation transformer are respectively connected with ABC three phases of the three-phase high-voltage bus (HB); the r 'terminal of the secondary r's winding of the traction-compensation transformer is led to a traction network (OCS) for connection through a feeder (F), and the s 'terminal of the secondary r's winding is grounded;
the measurement and control unit (MC) is mainly composed of a voltage transformer (PT), a Current Transformer (CT) and a Controller (CD); the input end of the Controller (CD) is respectively connected with the measuring ends of the voltage transformer (PT) and the Current Transformer (CT), and the output end of the Controller (CD) is respectively connected with the first passive compensation unit (SVG) 1 ) Second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Fourth reactive compensation unit (SVG) 4 ) Is connected with the control end of the control circuit.
2. The traction-compensation transformer-based in-phase power supply integrated compensation device according to claim 1, wherein: the primary side of the voltage transformer (PT) is connected between the feeder line (F) and the ground in parallel, and the primary side of the Current Transformer (CT) is connected on the feeder line (F) in series.
3. A comprehensive compensation method using the traction-compensation transformer-based in-phase power supply comprehensive compensation device according to claim 1 or 2, characterized in that: the method for comprehensively compensating the in-phase power supply comprises the following specific steps:
(1) Let the negative sequence allowable capacity of the three-phase high-voltage bus (HB) be S ε ；
(2) The Controller (CD) calculates the traction load power s passing through the feeder line (F) and the power factor thereof as cos phi by utilizing the voltage and the current respectively measured by the voltage transformer (PT) and the Current Transformer (CT) at the moment t, and then the controller outputs the traction load power s and the power factor thereof to the first passive compensation unit (SVG) according to the target traction load power factor or the target feeder line voltage 1 ) Absorbing reactive power Q 1 Control and compensate, and Q 1 The capacitance is positive; at this time, Q 1 Negative sequence power s generated by sum s - Is of the size of
(3) Judgment of Q 1 Negative sequence power s generated by sum s - And a negative-sequence allowable capacity S of a three-phase high-voltage bus (HB) ε The magnitude relation between the two is controlled by a Controller (CD) to control a second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Fourth reactive compensation unit (SVG) 4 ) Absorb reactive power for compensation, wherein a second reactive compensation unit (SVG 2 ) Third reactive compensation unit (SVG) 3 ) Fourth reactive compensation unit (SVG) 4 ) The absorption reactive power of (a) is Q respectively 2 、Q 3 、Q 4 。
4. A traction-compensation transformer-based in-phase power supply integrated compensation method according to claim 3, characterized in that: when s is - ≤S ε When in use, thenA Controller (CD) controls the second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Fourth reactive compensation unit (SVG) 4 ) Absorb reactive power to compensate, and Q 2 ＝Q 3 ＝0，Q 4 ＝-kQ 1 Reactive power Q 1 When capacitive, Q 4 Is inductive, wherein k is less than or equal to 1, and k is a real number.
5. The method for in-phase power supply integrated compensation based on traction-compensation transformers according to claim 3 or 4, characterized in that: when s is - ＞S ε When the Controller (CD) controls the second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Absorb reactive power to compensate, where Q 2 、Q 3 And Q 4 The component sizes of (2) are respectively:
Q 4 maintain unchanged, set->
6. The method for in-phase power supply integrated compensation based on a traction-compensation transformer according to claim 5, wherein the method comprises the following steps: when the feeder line (F) is in traction working condition, Q 2 Is inductive, Q 3 The component of (2) is capacitive.
7. The method for in-phase power supply integrated compensation based on a traction-compensation transformer according to claim 5, wherein the method comprises the following steps: when the feeder line (F) is in the regeneration working condition, Q 2 The components of (2) being capacitive, Q 3 The component of (2) is perceptual.
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| CN111585290B (en) * | 2020-06-15 | 2022-06-07 | 西南交通大学 | In-phase power supply structure of traction-compensation transformer and compensation method thereof |
| CN112886607B (en) * | 2021-02-03 | 2022-06-28 | 中国铁路经济规划研究院有限公司 | Reactance parameter adjusting method of electrified railway light-load capacitive reactive power compensation device |
| CN114771360B (en) * | 2022-04-21 | 2023-04-07 | 西南交通大学 | Alternating current and direct current traction power supply structure and control method for electrified railway |
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