CN109256785B - In-phase power supply comprehensive compensation device and method based on single-phase transformation and YNd compensation - Google Patents
In-phase power supply comprehensive compensation device and method based on single-phase transformation and YNd compensation Download PDFInfo
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- CN109256785B CN109256785B CN201811381720.1A CN201811381720A CN109256785B CN 109256785 B CN109256785 B CN 109256785B CN 201811381720 A CN201811381720 A CN 201811381720A CN 109256785 B CN109256785 B CN 109256785B
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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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- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1878—Arrangements for adjusting, eliminating or compensating reactive power in networks using tap changing or phase shifting transformers
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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 comprehensive compensation device and method based on single-phase transformation and YNd compensation, and relates to the technical field of alternating current electric railway power supply. The comprehensive compensation device of the in-phase power supply traction substation mainly comprises a first reactive compensation unit, a second reactive compensation unit, a third reactive compensation unit and a fourth reactive compensation unit; the first reactive compensation unit is connected to the secondary side of the single-phase main transformer, and the second reactive compensation unit, the third reactive compensation unit and the fourth reactive compensation unit are respectively connected to the secondary side of the YNd coupling group three-phase compensation transformer. In addition, the comprehensive compensation method of the in-phase power supply traction substation is also disclosed. Therefore, the invention not only can effectively cancel the electric split phase at the outlet of the 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 traction substation.
Description
Technical Field
The invention relates to the technical 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 single-phase transformation and YNd compensation.
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 single-phase transformation and YNd compensation, which can effectively solve the technical problem of real-time compensation of reactive power and negative sequence 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 single-phase transformation and YNd compensation is arranged in an in-phase power supply traction substation, and the in-phase power supply traction substation comprises a three-phase high-voltage bus, a single-phase main transformer connected with the three-phase high-voltage bus and a three-phase compensation transformer; the three-phase compensation transformer adopts YNd connecting windings, and the primary side of the three-phase compensation transformer is connected with A, B, C three phases of the three-phase high-voltage bus; the in-phase power supply 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 with the secondary side of the single-phase main transformer, the second reactive compensation unit is connected with a phase port of the secondary side a of the three-phase compensation transformer, the third reactive compensation unit is connected with a phase port of the secondary side b of the three-phase compensation transformer, and the fourth reactive compensation unit is connected with a phase port of the secondary side c of the three-phase compensation transformer; the measurement and control unit 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. The input end of the voltage transformer is connected in parallel with the secondary side of the single-phase main transformer, and the input end of the current transformer is connected in series with the feeder line. The primary winding of the single-phase main transformer is connected with A phase and B phase in the three-phase high-voltage bus, one end of the secondary winding is grounded, and the other end of the secondary winding is led to the traction network through a feeder line to be connected.
Preferably, the input end of the voltage transformer is connected with the secondary side of the single-phase main transformer in parallel, and the input end of the current transformer is connected with the feeder in series.
Preferably, the primary winding of the single-phase main transformer is connected with A phase and B phase in the three-phase high-voltage bus; one end of the secondary winding of the single-phase main transformer is grounded, and the other end of the secondary winding is led to the traction network through a feeder line to be connected.
In order to solve the technical problem, a further technical scheme adopted by the invention is as follows:
the comprehensive compensation method of the in-phase power supply comprehensive compensation device based on single-phase transformation and YNd compensation, which is provided by the technical scheme, comprises the following steps: 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 controller is in operation, 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, andi.e. reactive power Q 1 When capacitive, Q 2 、Q 3 、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 then atOn the basis of the components, the controller controls the second reactive power compensation unit and the third reactive power compensation unit to further absorb reactive power components for compensation, wherein Q 2 And Q 3 The component sizes are respectively:
further preferably, when the feed line is in traction mode, then Q 2 Is inductive, Q 3 The component of (2) is capacitive.
Further preferably, when the feed line is in a regenerative condition, then 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 in-phase power supply comprehensive compensation device and the method thereof can comprehensively generate reactive components and negative sequence components, so that the power factor, the feeder voltage and the negative sequence are comprehensively compensated, in-phase power supply is realized, the active power flow of a traction network of a traction transformer is not changed, and the matched three-phase compensation transformer does not transmit positive sequence active power, thereby having the technical advantage of no-payment of capacity electric charge;
2. the reactive compensator of the in-phase power supply integrated compensation device and the method thereof have reversible working conditions, and can still send up-to-standard electric energy to the power grid when the feeder line is in an equivalent regeneration working condition;
3. the single-phase main transformer and the three-phase compensation transformer can be installed in a common box, so that the occupied area is reduced;
4. simple structure, excellent performance, advanced technology, reliable method and easy implementation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the relationship structure between the measurement and control unit and the reactive compensation unit.
FIG. 3 is a flow chart of the integrated compensation method of the present 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 to the secondary side of the single-phase main transformer, so that the traction power factor and the feeder voltage meet the 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 of a first reactive compensation unit through a fourth reactive compensation unit reactive power output and reactive power output (components) of a part of a second reactive compensation unit and a third reactive compensation unit which are connected to the secondary side of a three-phase compensation transformer, compensating negative sequence current (power) generated by combining traction load and the first reactive compensation unit through reactive power output (components) of the other part of the second reactive compensation unit and the third reactive compensation unit, and achieving national standard requirements after compensation, wherein the second reactive compensation unit and the third reactive 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, the embodiment of the invention provides an in-phase power supply integrated compensation device based on single-phase transformation and ync compensation, which is arranged in an in-phase power supply traction substation, wherein the in-phase power supply traction substation mainly comprises a three-phase high-voltage bus HB, a single-phase main transformer TT connected with the three-phase high-voltage bus HB, a three-phase compensation transformer MT and a traction network OCS connected with the single-phase main transformer TT; the three-phase compensation transformer MT adopts YNd connection groups, and the primary side of the three-phase compensation transformer MT is connected with A, B, C three phases of the three-phase high-voltage bus HB; wherein: the in-phase power supply comprehensive compensation device mainly comprises a 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 Constructing; the first passive compensation unit SVG 1 The second reactive compensation unit SVG is connected to the secondary side of the single-phase main transformer TT 2 Said third reactive compensation unit SVG 3 And the fourth reactive compensation unit SVG 4 Are respectively connected to the secondary sides of the three-phase compensation transformer MT. In the embodiment of the invention, the input end of the voltage transformer PT is connected in parallel with the secondary side of the single-phase main transformer TT, and the input end of the current transformer CT is connected in series on the feeder line F. The primary winding of the single-phase main transformer TT is connected with A phases and B phases in a three-phase high-voltage bus HB; one end of the secondary winding of the single-phase main transformer TT is grounded, and the other end of the secondary winding is led to the traction network OCS through the feeder F to be connected, and the traction network OCS supplies power to the train LC.
In the embodiment of the present invention, the second reactive compensation unit SVG 2 The third reactive compensation unit SVG is connected with an alpha-phase port of the MT secondary side of the three-phase compensation transformer 3 The third reactive compensation unit SVG is connected with a phase port of the MT secondary side b of the three-phase compensation transformer 4 And the phase-C port of the secondary side of the three-phase compensation transformer MT is connected.
As shown in FIG. 2In the embodiment of the present invention, the in-phase power supply integrated compensation device further includes a measurement and control unit MC, where 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 end of the voltage transformer PT and the measuring end of 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 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 single-phase transformation and ync compensation described in the first embodiment, wherein: the comprehensive compensation method of the in-phase power supply traction substation 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 Fourth reactive compensationUnit SVG 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, andi.e. reactive power Q 1 When capacitive, Q 2 、Q 3 、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 then atBased on the components, the controller CD controls the second reactive compensation unit SVG 2 Third reactive power compensation unit SVG 3 Further absorbing reactive power components to compensate; wherein, in traction working condition, Q 2 Is inductive, Q 3 The component of (2) is capacitive; during regeneration conditions, Q 2 The components of (2) being capacitive, Q 3 Is inductive and Q 2 And Q 3 The component sizes are respectively:
Claims (6)
1. the in-phase power supply comprehensive compensation device based on single-phase transformation and YNd compensation is arranged in an in-phase power supply traction substation (SS), and the in-phase power supply traction substation (SS) comprises a three-phase high-voltage bus (HB), a single-phase main transformer (TT) connected with the three-phase high-voltage bus (HB) and a three-phase compensation transformer (MT); the three-phase compensation transformer (MT) adopts YNd connecting windings, and the primary side of the three-phase compensation transformer is connected with A, B, C three phases of the three-phase high-voltage bus (HB); the method is characterized in that: the in-phase power supply comprehensive compensation device comprises a first non-power supplyWork compensation unit (SVG) 1 ) Second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) And a fourth reactive compensation unit (SVG) 4 ) A measurement and control unit (MC); the first passive compensation unit (SVG 1 ) Is connected to the secondary side of the single-phase main transformer (TT), the second reactive compensation unit (SVG) 2 ) Is connected with a phase port of a secondary side a of the three-phase compensation transformer (MT), and the third reactive compensation unit (SVG 3 ) Is connected with a b-phase port of the secondary side of the three-phase compensation transformer (MT), and the fourth reactive compensation unit (SVG) 4 ) The three-phase compensation transformer (MT) secondary side c-phase port is connected with the three-phase compensation transformer (MT); the measurement and control unit (MC) comprises 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 active 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 unit; the input end of the voltage transformer (PT) is connected in parallel with the secondary side of the single-phase main transformer (TT), and the input end of the Current Transformer (CT) is connected in series with the feeder line (F); the primary winding of the single-phase main transformer (TT) is connected with A phase and B phase in a three-phase high-voltage bus (HB), one end of the secondary winding is grounded, and the other end of the secondary winding is led to a traction network (OCS) through a feeder (F) to be connected.
2. A compensation method of the in-phase power supply integrated compensation device based on single-phase transformation and YNd compensation according to claim 1 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 line (F) and the power factor thereof to be 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 apparent power s and the power factor thereof to the first active 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 O 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 。
3. The compensation method of claim 2, wherein: when s is - ≤S ε When the 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, andi.e. reactive power Q 1 When capacitive, Q 2 、Q 3 、Q 4 Is inductive, wherein k is less than or equal to 1, and k is a real number.
4. A compensation method according to claim 3, characterized in that: when s is - ＞S ε When then atOn a component basis, the Controller (CD) controls the second reactive compensation unit (SVG) 2 ) Third reactive compensation unit (SVG) 3 ) Further absorbing reactive power components for compensation, wherein Q 2 And Q 3 The component sizes are respectively:
wherein is provided with->
5. The compensation method of claim 2, wherein: when the feeder line (F) is in traction working condition, then Q 2 Is inductive, Q 3 The component of (2) is capacitive.
6. The compensation method of claim 2, wherein: when the feeder line (F) is in the regeneration working condition, then Q 2 The components of (2) being capacitive, Q 3 The component of (2) is perceptual.
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| CN111682556B (en) * | 2020-06-15 | 2022-03-29 | 西南交通大学 | Structure of in-phase power supply traction substation and compensation method thereof |
| CN111969868B (en) * | 2020-08-17 | 2022-05-10 | 成都尚华电气有限公司 | Reactive current loop given quantity calculation method, rectifier control method and system |
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