CN109088415B - Negative sequence compensation device and method for in-phase power supply substation - Google Patents
Negative sequence compensation device and method for in-phase power supply substation Download PDFInfo
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- CN109088415B CN109088415B CN201811062227.3A CN201811062227A CN109088415B CN 109088415 B CN109088415 B CN 109088415B CN 201811062227 A CN201811062227 A CN 201811062227A CN 109088415 B CN109088415 B CN 109088415B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention discloses a negative sequence compensation device and a negative sequence compensation method for an in-phase power supply substation, and relates to the technical field of alternating current electric railway power supply. The in-phase power supply substation comprises a three-phase high-voltage bus, a single-phase main transformer connected with the three-phase high-voltage bus, a traction network connected with the single-phase main transformer and a negative sequence compensation device; the negative sequence compensation device mainly comprises a three-phase compensation transformer, a reactive power compensator and a measurement and control unit; the primary side of the three-phase compensation transformer is connected with ABC three phases of the three-phase high-voltage bus, and the secondary side of the three-phase compensation transformer is connected with the reactive compensator; the reactive compensator is connected with the measurement and control unit; the reactive compensator only produces a negative sequence component and does not produce a positive sequence component. The invention can effectively cancel the electric split phase at the outlet of the traction substation, realize in-phase power supply and effectively solve the technical problem of real-time compensation of the negative sequence generated by the traction substation.
Description
Technical Field
The invention relates to the field of AC electric railway power supply, in particular to an in-phase power substation of a negative sequence compensation technology.
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 negative sequence compensation of the traction substation through reactive power flow control, and ensures that the negative sequence treatment reaches the national standard.
Disclosure of Invention
The invention aims to provide a negative sequence compensation device and a negative sequence compensation method for an in-phase power supply substation, which can effectively solve the technical problem of real-time compensation of a negative sequence generated by traction substation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
The negative sequence compensation device of the same-phase power supply substation comprises a three-phase high-voltage bus, a single-phase main transformer connected with the three-phase high-voltage bus and a traction network connected with the single-phase main transformer; wherein: the negative sequence compensation device mainly comprises a three-phase compensation transformer, a reactive power compensator and a measurement and control unit; the primary side of the three-phase compensation transformer is connected with ABC three phases of a three-phase high-voltage bus HB, and the secondary side of the three-phase compensation transformer is connected with the reactive compensator; and the reactive compensator is connected with the measurement and control unit.
The measurement and control unit is mainly composed of 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 connected with the control end of the reactive compensator.
Further preferably, the primary side of the voltage transformer is connected in parallel between the phase A and the phase B in the three-phase high-voltage bus, and the primary side of the current transformer is connected in series with the primary side A phase feeder line of the single-phase main transformer.
Still further preferably, the reactive compensator is mainly composed of a first reactive compensation unit and a second reactive compensation unit.
Specifically, when the three-phase compensation transformer is an YNd connection group, the first reactive compensation unit is connected with a phase port of a secondary side a of the three-phase compensation transformer, and the second reactive compensation unit is connected with a phase port of a secondary side b of the three-phase compensation transformer.
Specifically, when the three-phase compensation transformer is DNd connected groups, the secondary ca phase port of the three-phase compensation transformer is connected with the first reactive compensation unit, and the secondary bc phase port of the three-phase compensation transformer is connected with the second reactive compensation unit.
Preferably, the primary winding of the single-phase main transformer is connected with the A phase and the 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 of the single-phase main transformer is led to a traction network.
In order to solve the technical problem, a further technical scheme adopted by the invention is as follows:
The negative sequence compensation method for the in-phase power supply substation by using the negative sequence compensation device in any one of the technical schemes, wherein the negative sequence allowable capacity of the three-phase high-voltage bus is set as S d, the load power factor of the traction network is set as 1, and the negative sequence compensation method comprises the following steps: the controller calculates negative sequence power S corresponding to the load passing through the single-phase main transformer by utilizing the current and the voltage respectively measured by the voltage transformer and the current transformer at the moment t; the controller controls the first reactive compensation unit to absorb the inductive reactive power Q 1 and the second reactive compensation unit to absorb the equivalent amount of the capacitive reactive power Q 2 under the condition that the load of the single-phase main transformer is in a traction working condition, controls the first reactive compensation unit to absorb the equivalent amount of the inductive reactive power Q 1 and the second reactive compensation unit to absorb the equivalent amount of the inductive reactive power Q 2 under the condition that the load of the single-phase main transformer is in a regeneration working condition, and sets the sum of negative sequence components generated by Q 1 and Q 2 as S C, the value of Q 1、Q2 is as follows When Q 1、Q2 <0, let Q 1＝Q2 =0, represent that both the first reactive compensation unit and the second reactive compensation unit are off.
Compared with the prior art, the invention has the beneficial effects that:
1. the required reactive compensator only generates a negative sequence component, does not generate a positive sequence component, namely does not occupy the positive sequence capacity of the power grid, and the three-phase compensation transformer matched with the reactive compensator only transmits negative sequence power, does not transmit positive sequence power, has the technical advantage of no need of paying capacity electric charge, and simultaneously does not change the active power flow of the traction network of the traction transformer.
2. The reactive compensator has reversible working condition, and can still send up-to-standard electric energy to the power grid when the in-phase power supply and transformation system is in an equivalent regeneration working condition.
3. The single-phase main transformer TT and the three-phase compensation transformer MT can be installed in a common box, so that occupied land is reduced.
4. Simple structure, excellent performance, advanced technology, reliable method and easy implementation.
Drawings
Fig. 1 is a schematic diagram of an in-phase power supply substation in which the negative sequence compensation device of the present invention is located.
FIG. 2 is a schematic diagram of the relationship structure between the measurement and control unit and the reactive compensator according to the present invention.
FIG. 3 is a schematic diagram of the input and output relationships of the controller of the present invention.
Fig. 4 is a schematic diagram of a relationship structure between a three-phase compensation transformer and a reactive power compensator of the negative sequence compensation device according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a relationship structure between a three-phase compensation transformer and a reactive power compensator of a negative sequence compensation device according to a second embodiment of the present invention.
Fig. 6 is a flowchart of a negative sequence compensation method according to a third embodiment of the invention.
Detailed Description
For a better understanding of the invention, the working principle of the invention is briefly described here: the power factor of the AC-DC-AC train is very high and can reach 1, and the negative sequence of the three-phase high-voltage bus reaches the standard checking point, so that the negative sequence current or power generated by the traction load can be compensated by installing a negative sequence compensation system, and the national standard requirement is met after the compensation, wherein the negative sequence compensation system generates the negative sequence power flow through a reactive compensator SVG thereof, and the original active power flow is not changed. 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 a negative sequence compensation device of an in-phase power supply substation, which 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 traction network OCS connected with the single-phase main transformer TT. The negative sequence compensation device NCS mainly comprises a three-phase compensation transformer MT, a reactive power compensator SVG and a measurement and control unit MC; the primary side of the three-phase compensation transformer MT is connected with ABC three phases of a three-phase high-voltage bus HB, and the secondary side of the three-phase compensation transformer MT is connected with the reactive compensator SVG; the reactive compensator SVG is connected with the measurement and control unit MC. In the embodiment of the invention, the primary winding of the single-phase main transformer TT is connected with the A phase and the B phase in the 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 of the single-phase main transformer TT is led to the traction network OCS. In an embodiment of the present invention, the traction network OCS supplies power to the load (train) LC.
As shown in fig. 2 and 3, 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 connected with the control end of the reactive compensator SVG. In the embodiment of the invention, the primary side of the voltage transformer PT is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus HB, and the primary side of the current transformer CT is connected in series with the primary side A phase feeder line of the single-phase main transformer TT.
As shown in fig. 3 and 4, the reactive compensator SVG mainly comprises a first reactive compensation unit SVG 1 and a second reactive compensation unit SVG 2. In the embodiment of the invention, the three-phase compensation transformer MT is an YNd coupling group, the first active compensation unit SVG 1 is connected to the phase port of the secondary side a of the three-phase compensation transformer MT, and the second reactive compensation unit SVG 2 is connected to the phase port of the secondary side b of the three-phase compensation transformer MT.
Since the reactive compensator SVG including the first reactive compensation unit SVG 1 and the second reactive compensation unit SVG 2 generates only the negative sequence component, no positive sequence component; the three-phase compensation transformer MT only transmits negative sequence power, and does not transmit positive sequence power. Thus, the controller CD controls the first reactive compensation unit SVG 1 to absorb inductive (capacitive) reactive power and the second reactive compensation unit SVG 2 to absorb capacitive (inductive) reactive power when the load LC is in traction (or regeneration) operating conditions.
In the embodiment of the invention, the primary side of the single-phase main transformer TT and the voltage transformer PT may be connected to the B phase and the C phase of the three-phase high-voltage bus HB at the same time, or connected to the C phase and the a phase of the three-phase high-voltage bus HB at the same time, and the secondary side of the three-phase compensation transformer MT is connected to the first reactive compensation unit SVG 1 and the second reactive compensation unit SVG 2 to be correspondingly adjusted.
Example two
As shown in fig. 1, an embodiment of the present invention provides an in-phase power supply substation SS, where the in-phase power supply substation includes a three-phase high-voltage bus HB, a single-phase main transformer TT connected to the three-phase high-voltage bus HB, and a traction network OCS connected to the single-phase main transformer TT; wherein: the in-phase power supply substation SS also comprises a negative sequence compensation device NCS; the negative sequence compensation device NCS mainly comprises a three-phase compensation transformer MT, a reactive power compensator SVG and a measurement and control unit MC; the primary side of the three-phase compensation transformer MT is connected with ABC three phases of a three-phase high-voltage bus HB, and the secondary side of the three-phase compensation transformer MT is connected with the reactive compensator SVG; the reactive compensator SVG is connected with the measurement and control unit MC. In the embodiment of the invention, the primary winding of the single-phase main transformer TT is connected with the A phase and the B phase in the 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 of the single-phase main transformer TT is led to the traction network OCS. In the embodiment of the invention, the traction network OCS supplies power to the train LC.
As shown in fig. 2 and 3, 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 connected with the control end of the reactive compensator SVG. In the embodiment of the invention, the primary side of the voltage transformer PT is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus HB, and the primary side of the current transformer CT is connected in series with the primary side A phase feeder line of the single-phase main transformer TT.
As shown in fig. 4, the reactive compensator SVG mainly includes a first reactive compensation unit SVG 1 and a second reactive compensation unit SVG 2. In the embodiment of the present invention, the three-phase compensation transformer MT is a DNd connection group, the secondary ca phase port of the three-phase compensation transformer MT is connected to the first passive compensation unit SVG 1, and the secondary bc phase port of the three-phase compensation transformer MT is connected to the second passive compensation unit SVG 2.
Since the reactive compensator SVG including the first reactive compensation unit SVG 1 and the second reactive compensation unit SVG 2 generates only the negative sequence component, no positive sequence component; the three-phase compensation transformer MT only transmits negative sequence power, and does not transmit positive sequence power. Thus, the controller CD controls the first reactive compensation unit SVG 1 to absorb inductive (capacitive) reactive power and the second reactive compensation unit SVG 2 to absorb capacitive (inductive) reactive power when the load LC is in traction (or regeneration) operating conditions.
In the embodiment of the invention, the primary side of the single-phase main transformer TT and the voltage transformer PT may be connected to the B phase and the C phase of the three-phase high-voltage bus HB at the same time, or connected to the C phase and the a phase of the three-phase high-voltage bus HB at the same time, and the secondary side of the three-phase compensation transformer MT is connected to the first reactive compensation unit SVG 1 and the second reactive compensation unit SVG 2 to be correspondingly adjusted.
The reactive compensator SVG comprising the first reactive compensation unit SVG 1 and the second reactive compensation unit SVG 2 only generates a negative sequence component and does not generate a positive sequence component; the three-phase compensation transformer MT only transmits negative sequence power, and does not transmit positive sequence power.
Example III
As shown in fig. 6, an embodiment of the present invention provides a negative sequence compensation method for an in-phase power supply substation using the negative sequence compensation device described in the first embodiment or the second embodiment, where the negative sequence compensation method includes the steps of: setting the negative sequence allowable capacity of a three-phase high-voltage bus HB as S d and setting the load power factor of a traction network as 1;
the controller CD utilizes the current and the voltage respectively measured by the voltage transformer PT and the current transformer CT at the moment t and calculates the negative sequence power S corresponding to the load passing through the single-phase main transformer TT;
Under the condition that the load of the single-phase main transformer TT is in a traction working condition, the controller CD controls the first reactive compensation unit SVG 1 to absorb inductive reactive power to be Q 1, the second reactive compensation unit SVG 2 to absorb equivalent capacitive reactive power to be Q 2, and the value of Q 1、Q2 is set to be S C when the sum of negative sequence components generated by Q 1 and Q 2 is When Q 1、Q2 <0, let Q 1＝Q2 =0, represent that both the first reactive compensation unit and the second reactive compensation unit are off.
Under the condition that the load of the single-phase main transformer TT is in a regeneration working condition, the controller CD controls the first reactive compensation unit SVG 1 to absorb the accommodation reactive power to be Q 1, the second reactive compensation unit SVG 2 to absorb the equivalent amount of the induction reactive power to be Q 2, and the value of Q 1、Q2 is given by the sum of negative sequence components generated by Q 1 and Q 2 to be S C When Q 1、Q2 <0, let Q 1＝Q2 =0, represent that both the first reactive compensation unit and the second reactive compensation unit are off.
Therefore, the negative sequence compensation method of the embodiment of the invention utilizes the characteristics that the reactive power compensator only generates a negative sequence component and does not generate a positive sequence component, so that the negative sequence compensation method not only can not occupy the positive sequence capacity of the power grid and the three-phase compensation transformer matched with the positive sequence capacity of the power grid only transmit the negative sequence power, but also can not transmit the positive sequence power; the method also has the technical advantage of exempt from capacity electric charge, and does not change the active power flow of the traction network of the traction substation.
Claims (6)
1. The negative sequence compensation device of the in-phase power supply substation 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 traction network (OCS) connected with the single-phase main transformer (TT); the method is characterized in that: the negative sequence compensation device (NCS) is arranged in the in-phase power Supply Substation (SS) and consists of a three-phase compensation transformer (MT), a reactive compensator (SVG) and a measurement and control unit (MC); 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, and the secondary side of the three-phase compensation transformer (MT) is connected with the reactive power compensator (SVG); the reactive compensator (SVG) is connected with the measurement and control unit (MC); the reactive power compensator (SVG) consists of a first reactive power compensation unit (SVG 1) and a second reactive power compensation unit (SVG 2), and the first reactive power compensation unit (SVG 1) and the second reactive power compensation unit (SVG 2) are respectively connected with different ports of the secondary side of the three-phase compensation transformer (MT); the reactive compensator (SVG) only produces a negative sequence component, and does not produce a positive sequence component; the three-phase compensation transformer (MT) only transmits negative sequence power and does not transmit positive sequence power; the first reactive compensation unit (SVG 1) and the second reactive compensation unit (SVG 2) absorb equal amounts of reactive power of opposite polarity; when the three-phase compensation transformer (MT) is an YNd connection group, a first reactive compensation unit (SVG 1) is connected with a port of a secondary side a of the three-phase compensation transformer (MT), and a second reactive compensation unit (SVG 2) is connected with a port of a secondary side b of the three-phase compensation transformer (MT); when the three-phase compensation transformer (MT) is a DNd connection group, a secondary ca phase port of the three-phase compensation transformer (MT) is connected with the first reactive compensation unit (SVG 1), and a secondary bc phase port of the three-phase compensation transformer (MT) is connected with the second reactive compensation unit (SVG 2).
2. The negative sequence compensation device of an in-phase power supply substation according to claim 1, wherein: 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 of the single-phase main transformer (TT) is grounded, and the other end of the secondary winding of the single-phase main transformer is led to a traction network (OCS) for connection.
3. A negative sequence compensation device of an in-phase power supply substation according to claim 1 or 2, characterized in that: the measurement and control unit (MC) is 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 connected with the control end of the reactive compensator (SVG).
4. A negative sequence compensation device for an in-phase power supply substation according to claim 3, wherein: the primary side of the voltage transformer (PT) is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus (HB), and the primary side of the Current Transformer (CT) is connected in series with an A phase feeder line of the primary side of the single-phase main transformer (TT).
5. A negative sequence compensation method of an in-phase power supply substation using the negative sequence compensation device according to any one of claims 1 to 4, characterized in that: the negative sequence allowable capacity of the three-phase high-voltage bus (HB) is set as S d, the traction network load power factor is set as 1, and the negative sequence compensation method specifically comprises the following steps: the Controller (CD) calculates the negative sequence power S corresponding to the load through the single-phase main transformer (TT) by using the current and the voltage respectively measured by the voltage transformer (PT) and the Current Transformer (CT) at the moment t, the Controller (CD) controls the first reactive power compensation unit (SVG 1) to absorb the inductive reactive power Q 1 and the second reactive power compensation unit (SVG 2) to absorb the same amount of the capacitive reactive power Q 2 under the condition that the load of the single-phase main transformer (TT) is in traction working condition, and controls the first reactive power compensation unit (SVG 1) to absorb the same amount of the inductive reactive power Q 1 and the second reactive power compensation unit (SVG 2) to absorb the same amount of the inductive reactive power Q 2 under the condition that the load of the single-phase main transformer (TT) is in regeneration working condition, and the value of Q 1、Q2 is set to be S C when the sum of negative sequence components generated by Q 1 and Q 2 。
6. The negative sequence compensation method of claim 5, wherein: when Q 1、Q2 <0, let Q 1=Q2 =0, represent that both the first reactive compensation unit (SVG 1) and the second reactive compensation unit (SVG 2) are deactivated.
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| CN108923429B (en) * | 2018-09-12 | 2024-01-12 | 西南交通大学 | In-phase power supply substation |
| CN114013345B (en) * | 2021-10-25 | 2023-09-19 | 成都尚华电气有限公司 | Dual-system traction power supply device, control device, system and method |
| CN114043904B (en) * | 2021-11-22 | 2023-04-25 | 西南交通大学 | Double-flow traction power supply system and control method for electrified railway |
| 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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