CN112865126B - Shared sampling current circuit of reactive power compensation device of low-voltage single-bus segmented system - Google Patents
Shared sampling current circuit of reactive power compensation device of low-voltage single-bus segmented system Download PDFInfo
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- CN112865126B CN112865126B CN202110290763.4A CN202110290763A CN112865126B CN 112865126 B CN112865126 B CN 112865126B CN 202110290763 A CN202110290763 A CN 202110290763A CN 112865126 B CN112865126 B CN 112865126B
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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 a shared sampling current circuit of a reactive power compensation device of a low-voltage single-bus subsection system, which is characterized in that two intermediate relays are additionally arranged in a certain low-voltage cabinet (such as a bus-coupled circuit breaker cabinet), auxiliary contacts of two incoming line circuit breakers and the bus-coupled circuit breaker are distributed and connected, and the auxiliary contacts of the two intermediate relays are further distributed and connected with a sampling current transformer and a controller of the reactive power compensation device, so that the reactive power compensation device of the low-voltage single-bus subsection system can share sampling current, the total reactive power compensation capacity is reduced to 50% of the original capacity, and the reactive power compensation capacity meeting requirements can be put into use in various operation modes (see a logic table). The total reactive compensation capacity can be reduced to 50 percent of the original capacity, thereby not only meeting the operation requirement, but also reducing the investment.
Description
Technical Field
The invention belongs to the technical field of electrical design and installation, and particularly relates to a wiring method for sharing sampling current of a reactive power compensation device of a low-voltage single-bus segmented system.
Background
In a conventional low-voltage single-bus segmented system, a reactive power compensation device is generally configured on a bus segment in an I/II section according to a compensation capacity of 100% of the total load of two buses, so that a low-voltage power distribution system can provide a sufficient amount of reactive power compensation capacity no matter what operation state the low-voltage power distribution system is in. When the buses operate in a subsection mode, because the reactive compensation devices on the buses of all sections are only responsible for the needs of the sections, only about 50% of compensation capacity is basically in an input state; when only one incoming line breaker is in a closing state (the other incoming line breaker is in an opening state) and the bus coupler breaker is closed, the reactive compensation device on the bus section corresponding to the opening state breaker is in an exiting state because the current sampling of the reactive compensation device is only taken from the incoming line cabinet corresponding to the closing state breaker; namely: under any operation mode, about 50% of the total reactive compensation capacity is in an idle state.
In fact, the key to the above problem is that the sampling current of reactive compensation cannot be shared, so that no current passes through the reactive compensation controller corresponding to the inlet line breaker in the open state, and the corresponding reactive compensation device cannot be put into use.
How to satisfy the compensation capacity and reduce the idle reactive power compensation device is a problem that needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a new design method to realize that the reactive compensation device of a low-voltage single-bus segmented system shares sampling current, reduces the total reactive compensation capacity to 50% of the original capacity, and can input the reactive compensation capacity meeting the requirement in various typical operation modes (see a logic table).
The technical scheme is as follows:
the invention discloses a shared sampling current circuit of a reactive power compensation device of a low-voltage single-bus segmented system, wherein the reactive power compensation device of the low-voltage single-bus segmented system comprises a first-section bus, a second-section bus and reactive power compensation devices respectively arranged on the first-section bus and the second-section bus, and the first-section bus and the second-section bus are connected through a bus coupler circuit breaker 3 QF.
The shared sampling current circuit comprises a control loop and a current loop, wherein the control loop comprises:
an auxiliary normally closed contact of the first section of bus circuit breaker 1QF, a normally open contact of the second section of bus circuit breaker 2QF, a normally open contact of the bus tie circuit breaker 3QF and an electromagnetic coil of the first electromagnetic relay KA1 are connected between a live wire and a zero line in series;
an auxiliary normally closed contact of a second section bus circuit breaker 2QF, a normally open contact of a first section bus circuit breaker 1QF, a normally open contact of a bus tie circuit breaker 3QF and an electromagnetic coil of a second electromagnetic relay KA2 are connected in series between a live wire and a zero line;
in the current loop:
the current transformer 1Ta of the I section bus, the auxiliary normally closed contact of the first electromagnetic relay KA1, the controller CR1 of the I section bus reactive compensator, the auxiliary normally closed contact of the second electromagnetic relay KA2 and the auxiliary normally open contact of the I section bus breaker 1QF are connected in series to form a closed loop; two ends of an auxiliary normally open contact of the I-section bus breaker 1QF are connected with an auxiliary normally open contact of the first electromagnetic relay KA1 in parallel; the auxiliary normally open contact of the I section bus circuit breaker 1QF is grounded with the connecting end of a current transformer 1Ta of the I section bus;
the current transformer 2Ta of the section II bus, the auxiliary normally closed contact of the second electromagnetic relay KA2, the controller CR2 of the section II bus reactive compensator, the auxiliary normally closed contact of the first electromagnetic relay KA1 and the auxiliary normally open contact of the section II bus breaker 2QF are connected in series to form a closed loop; two ends of the auxiliary normally open contact of the II-section bus circuit breaker 2QF are connected with the auxiliary normally open contact of the second electromagnetic relay KA2 in parallel; the auxiliary normally open contact of the II section bus circuit breaker 2QF is grounded with the connecting end of the current transformer 2Ta of the II section bus;
an auxiliary normally closed contact of the first electromagnetic relay KA1 is connected with a connecting end of a controller CR1 of the I-section bus reactive power compensator through an auxiliary normally open contact of the first electromagnetic relay KA1, and a connecting end of a controller CR2 of the II-section bus reactive power compensator and an auxiliary normally closed contact of the first electromagnetic relay KA1 is connected;
the auxiliary normally closed contact of the second electromagnetic relay KA2 is connected with the connecting end of the controller CR2 of the reactive power compensator of the section II bus through the auxiliary normally open contact of the second electromagnetic relay KA2, and the connecting ends of the controller CR1 of the reactive power compensator of the section I bus and the auxiliary normally closed contact of the second electromagnetic relay KA2 are connected.
The invention also discloses a switching method of the reactive power compensation device of the low-voltage single-bus segmented system, based on the shared sampling current circuit, the low-voltage single-bus segmented system comprises three operation modes:
the first method is as follows: 1QF switching-on of a first section of bus circuit breaker, 2QF switching-on of a second section of bus circuit breaker and 3QF switching-off of a bus-coupled circuit breaker;
the I section bus and the II section bus are electrified: sampling currents of a current transformer 1Ta of the I section bus and a current transformer 2Ta of the II section bus respectively flow into a controller CR1 of the corresponding I section bus reactive power compensator and a controller CR2 of the corresponding II section bus reactive power compensator, and the corresponding reactive power compensators are put into operation;
the second method comprises the following steps: 1QF switching-on of a first section of bus circuit breaker, 2QF switching-off of a second section of bus circuit breaker and 3QF switching-off of a bus tie circuit breaker;
the I section bus is electrified, and the II section bus is uncharged: the sampling current of the current transformer 1Ta of the I section bus flows into the controller CR1 of the corresponding I section bus reactive compensator, and only the reactive compensator of the I section bus is put into operation;
the third method comprises the following steps: 1QF switching-on of a first section of bus circuit breaker, 2QF switching-off of a second section of bus circuit breaker and 3QF switching-on of a bus tie circuit breaker;
the I section bus is electrified, and the II section bus is electrified through the bus tie breaker connection: the sampled current of the current transformer 1Ta of the I section bus flows into the controller CR1 of the I section bus reactive compensator and the controller CR2 of the II section bus reactive compensator, and the corresponding reactive compensators are put into operation.
The invention has the advantages of
The invention realizes that the reactive power compensation device of the low-voltage single-bus segmented system shares sampling current, reduces the total reactive power compensation capacity to 50 percent of the original total reactive power compensation capacity, and can put in the reactive power compensation capacity meeting the requirement in various operation modes (see a logic table). The total reactive compensation capacity can be reduced to 50 percent of the original capacity, thereby not only meeting the operation requirement, but also reducing the investment.
Drawings
FIG. 1 is a typical single line diagram of a low-voltage single bus bar section in the background art
FIG. 2 is a control loop diagram of the shared sample current circuit of the present invention
FIG. 3 is a current loop diagram of the shared sample current circuit of the present invention
FIG. 4 is a current flow diagram of the first operation mode in the embodiment
FIG. 5 is a current flow diagram of the second operation mode in the embodiment
FIG. 6 is a current flow diagram of the third operation mode in the embodiment
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
referring to fig. 1, a typical single line diagram of a low-voltage single bus segment, a set of reactive compensation devices are configured on buses of the I/II segment, and reactive compensation sampling currents are respectively led from current transformers 1TAc and 2TAc near an incoming line breaker. In a traditional mode, in order to ensure that the compensation capacity requirement can be met in any operation mode (see a logic table), the compensation capacities of two sets of reactive compensation devices are set based on the requirements of all loads on an I/II section bus, and at the moment, when a bus tie breaker is in a first mode and a second mode (see the logic table 1) of a tripping state, the actual input compensation capacities of the two sets of reactive compensation devices can only reach about 50% of the configured capacity; when the bus tie breaker is in a third mode (see a logic table) of a closing state, only one of the two sets of reactive compensation devices is put into the circuit breaker, namely: the actual projected compensation capacity can only reach 50% of the total deployed capacity. Thus, whatever the mode of operation, the reactive power compensation device will have about 50% of its capacity in the exit state.
Logic table 1: operation mode under conventional wiring of low-voltage single-bus segmented system
| 1QF | 2QF | 3QF | |
| In a |
1 | 1 | 0 |
| Mode two | 1 | 0 | 0 |
| Mode III | 1 | 0 | 1 |
In order to solve the above problem, referring to fig. 2 and fig. 3, two intermediate relays (KA1, KA2) are disposed in a low-voltage cabinet (such as a buscouple breaker cabinet), and are connected with the auxiliary contacts of two incoming line breakers (1QF, 2QF) and a buscouple breaker (3QF) as shown in fig. 2, and the auxiliary contacts of the two intermediate relays are further connected with reactive compensation sampling current transformers (1TAc, 2TAc) and controllers (CR1, CR2) as shown in fig. 3. The wiring can share the sampling current of the reactive power compensation device of the low-voltage single-bus segmented system, so that the reactive power compensation capacity meeting the requirement can be input in various operation modes (see a logic table 2), and the total reactive power compensation capacity is reduced to 50% of that of the traditional sampling mode.
Logic table 2: operation mode under conventional wiring of low-voltage single-bus segmented system
| 1QF | 2QF | 3QF | KA1 | KA2 | CR1 | CR2 | |
| In a |
1 | 1 | 0 | 0 | 0 | 1 | 1 |
| Mode two | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
| Mode III | 1 | 0 | 1 | 0 | 1 | 1 | 1 |
The first mode (shown in a logic table 2) comprises 1QF closing, 2QF closing, 3QF opening, and parallel operation with the sections I and II electrified; from fig. 2, it can be concluded that KA1 and KA2 are not charged; the flow direction of the sampling current is shown in fig. 4, the I section of the sampling current flows back through KA1, CR1, KA2 and 1QF, and the II section of the sampling current flows back through KA2, CR2, KA1 and 2 QF; the two sections of sampling currents respectively flow into the respective reactive compensation controllers, and the corresponding reactive compensation devices are put into operation. Meets the operation requirement.
In the second mode (shown in a logic table 2), 1QF switching-on, 2QF and 3QF switching-off, the section I is electrified, and the section II is uncharged; from fig. 2, it can be concluded that KA1 and KA2 are not charged; the flow direction of the sampling current is shown in figure 5, the sampling current at the I section flows back through KA1, CR1, KA2 and 1QF, and the sampling current at the II section does not exist; the I section sampling current only flows into the I section reactive compensation controller, and the I section reactive compensation device is put into operation. Meets the operation requirement.
The third mode (shown in a logic table 2) comprises 1QF closing, 3QF closing, 2QF opening, connection of the section I and the section II through a bus-tie breaker, and leading of electric energy from 1 QF; from fig. 2, it can be concluded that KA1 is uncharged and KA2 is charged; the flow of the sampling current is shown in fig. 6, the sampling current from 1TAc flows back through KA1, CR1, KA2, CR2, KA1 and KA2, and no sampling current flows out from 2 TAc; sampling current from 1TAC flows into the two sections of reactive compensation controllers respectively, and the corresponding reactive compensation devices are put into operation. Meets the operation requirement.
The invention realizes that the reactive power compensation device of the low-voltage single-bus segmented system shares sampling current, reduces the total reactive power compensation capacity to 50 percent of the original total reactive power compensation capacity, and can put in the reactive power compensation capacity meeting the requirement under various operation modes (see a logic table). The total reactive compensation capacity can be reduced to 50 percent of the original capacity, thereby not only meeting the operation requirement, but also reducing the investment.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (2)
1. The utility model provides a low pressure single bus segmentation system reactive power compensator's sharing sampling current circuit, low pressure single bus segmentation system reactive power compensator include I section generating line and II section generating line to and dispose the reactive power compensator on I section generating line and II section generating line respectively, connect its characterized in that through bus connector circuit breaker 3QF between I section generating line and the II section generating line:
the shared sampling current circuit comprises a control loop and a current loop, wherein the control loop comprises:
an auxiliary normally closed contact of the first section of bus circuit breaker 1QF, a normally open contact of the second section of bus circuit breaker 2QF, a normally open contact of the bus tie circuit breaker 3QF and an electromagnetic coil of the first electromagnetic relay KA1 are connected between a live wire and a zero line in series;
an auxiliary normally closed contact of a second section bus circuit breaker 2QF, a normally open contact of a first section bus circuit breaker 1QF, a normally open contact of a bus tie circuit breaker 3QF and an electromagnetic coil of a second electromagnetic relay KA2 are connected in series between a live wire and a zero line;
in the current loop:
the current transformer 1Ta of the I section bus, the auxiliary normally closed contact of the first electromagnetic relay KA1, the controller CR1 of the I section bus reactive compensator, the auxiliary normally closed contact of the second electromagnetic relay KA2 and the auxiliary normally open contact of the I section bus breaker 1QF are connected in series to form a closed loop; two ends of an auxiliary normally open contact of the I-section bus breaker 1QF are connected with an auxiliary normally open contact of the first electromagnetic relay KA1 in parallel; the auxiliary normally open contact of the I section bus circuit breaker 1QF is grounded with the connecting end of a current transformer 1Ta of the I section bus;
the current transformer 2Ta of the section II bus, the auxiliary normally closed contact of the second electromagnetic relay KA2, the controller CR2 of the section II bus reactive compensator, the auxiliary normally closed contact of the first electromagnetic relay KA1 and the auxiliary normally open contact of the section II bus breaker 2QF are connected in series to form a closed loop; two ends of the auxiliary normally open contact of the II-section bus circuit breaker 2QF are connected with the auxiliary normally open contact of the second electromagnetic relay KA2 in parallel; the auxiliary normally open contact of the II section bus circuit breaker 2QF is grounded with the connecting end of the current transformer 2Ta of the II section bus;
an auxiliary normally closed contact of the first electromagnetic relay KA1 is connected with a connecting end of a controller CR1 of the I-section bus reactive power compensator through an auxiliary normally open contact of the first electromagnetic relay KA1, and a connecting end of a controller CR2 of the II-section bus reactive power compensator and an auxiliary normally closed contact of the first electromagnetic relay KA1 is connected;
the auxiliary normally closed contact of the second electromagnetic relay KA2 is connected with the connecting end of the controller CR2 of the reactive power compensator of the section II bus through the auxiliary normally open contact of the second electromagnetic relay KA2, and the connecting ends of the controller CR1 of the reactive power compensator of the section I bus and the auxiliary normally closed contact of the second electromagnetic relay KA2 are connected.
2. A switching method of a reactive power compensation device of a low-voltage single-bus segmented system is based on the shared sampling current circuit of claim 1, and is characterized in that the low-voltage single-bus segmented system comprises three operation modes:
the method I comprises the following steps: 1QF switching on a first section of bus circuit breaker, 2QF switching on a second section of bus circuit breaker and 3QF switching off a bus tie circuit breaker;
the I section bus and the II section bus are electrified: sampling currents of a current transformer 1Ta of the I section bus and a current transformer 2Ta of the II section bus respectively flow into a controller CR1 of the corresponding I section bus reactive power compensator and a controller CR2 of the corresponding II section bus reactive power compensator, and the corresponding reactive power compensators are put into operation;
the second method comprises the following steps: 1QF switching-on of a first section of bus circuit breaker, 2QF switching-off of a second section of bus circuit breaker and 3QF switching-off of a bus tie circuit breaker;
the I section bus is electrified, and the II section bus is uncharged: the sampling current of the current transformer 1Ta of the I section bus flows into the controller CR1 of the corresponding I section bus reactive compensator, and only the reactive compensator of the I section bus is put into operation;
the third method comprises the following steps: 1QF switching-on of a first section of bus circuit breaker, 2QF switching-off of a second section of bus circuit breaker and 3QF switching-on of a bus tie circuit breaker;
the I section bus is electrified, and the II section bus is electrified through the bus tie breaker connection: the sampling current of the current transformer 1Ta of the I section bus flows into the controller CR1 of the I section bus reactive compensator and the controller CR2 of the II section bus reactive compensator, and the corresponding reactive compensators are put into operation.
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