CN110994721A - Transformer substation direct current system storage battery pack checking discharge circuit - Google Patents
Transformer substation direct current system storage battery pack checking discharge circuit Download PDFInfo
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- CN110994721A CN110994721A CN201911244918.XA CN201911244918A CN110994721A CN 110994721 A CN110994721 A CN 110994721A CN 201911244918 A CN201911244918 A CN 201911244918A CN 110994721 A CN110994721 A CN 110994721A
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- battery pack
- contactor
- normally open
- direct current
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the invention relates to the technical field of power supply and distribution, in particular to a checking discharge circuit of a storage battery pack of a direct current system of a transformer substation. The embodiment of the invention discloses a checking discharge circuit of a storage battery pack of a direct current system of a transformer substation, which comprises the following steps: the rectifier device and the storage battery pack module are connected in parallel; the storage battery pack module comprises a storage battery pack and a discharge load which are connected in parallel between a positive direct current bus and a negative direct current bus; a switch and a relay connected in parallel with the switch are arranged on the positive direct current bus between the rectifying device and the storage battery pack module; the normally open contacts of the contactor and the relay are connected in series between the positive direct current bus and the negative direct current bus. When the storage battery discharges, the rectifying device does not need to be withdrawn, so that the safety and reliability of power supply are improved; the storage battery pack and the discharge load are automatically switched on as long as the switch is switched off; the diode can prevent the rectifying device from flowing backwards to the discharging load; and the storage battery pack can supply power to the direct current bus in a standby mode once the rectifying device fails.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supply and distribution, in particular to a checking discharge circuit of a storage battery pack of a direct current system of a transformer substation.
Background
The direct current system of transformer substation includes: a rectifying device, an alternating current power supply; the rectifying device rectifies the alternating current power supply into direct current and then transmits the direct current to the direct current bus; also included is a battery pack comprising a plurality of individual batteries connected in series. The rectifying device and the storage battery pack I are used for supplying power to the direct current bus; the operating regulations stipulate that the storage battery pack must be periodically subjected to check discharge; when the storage battery pack performs check discharge, power supply must be kept to the direct current bus, and the rectifying device must be withdrawn; the direct current bus is only supplied with power by the storage battery pack, so that the reliability is reduced. When the storage battery pack performs check discharge, electric quantity consumption is generated, and when the current consumption is too low, the storage battery pack cannot normally supply power to the direct current bus.
Disclosure of Invention
Therefore, the embodiment of the invention provides a checking discharge circuit of a storage battery pack of a substation direct-current system, which is used for solving the problem that the reliability of direct-current bus power supply is reduced due to the discharge of the storage battery pack in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of an embodiment of the present invention, a substation dc system storage battery pack checking discharge circuit includes:
a rectifying device and a storage battery module; the rectifying device and the storage battery pack module are connected in parallel between the positive and negative direct-current buses; the battery pack module includes: the storage battery pack and the discharge load are connected in parallel between the positive direct current bus and the negative direct current bus; a switch is arranged on a positive direct current bus between the rectifying device and the storage battery pack module;
the first relay is connected with the switch in parallel; the coil of the first relay is connected with the switch in parallel;
the discharging load control circuit is arranged between the positive direct current bus and the negative direct current bus; the controller is used for controlling whether the discharging load is connected or not; the discharging load control circuit comprises a first contactor and a normally open contact of a first relay which are connected in series; the coil of the first contactor and the normally open contact of the first relay are connected in series between the positive and negative direct current buses; the normally open contact of the first contactor is arranged between the discharge load and the direct current bus; when the normally open contact of the first contactor is closed, the discharging load is connected to the direct current bus and connected with the storage battery pack; when the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the direct current bus, and the storage battery pack is disconnected;
when the switch is changed from being closed to being opened, a coil of the first relay is electrified, and a normally open contact of the first relay is closed; the coil of the first contactor is electrified; the normally open contact of the first contactor is closed, and the discharge load is connected with the storage battery pack to carry out check discharge;
when the switch is changed from off to on, the coil of the first relay loses power, and the normally open contact of the first relay is disconnected; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
Further, still include: a diode connected in parallel with the switch; the cathode of the diode is connected with the first end of the switch; the anode of the diode is connected with the second end of the switch; the first end of the switch is connected with the rectifying device through the positive direct current bus; the second end is connected with the storage battery pack module through a positive direct current bus.
Further, still include: a second relay; the second relay is connected with the storage battery pack;
the second relay comprises a normally open contact; a normally open contact of a second relay is arranged in the discharging load control circuit; the normally open contacts of the first contactor and the first relay are connected in series;
when the output voltage of the storage battery pack is lower than a preset threshold value, the normally open contact of the second relay is disconnected; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, and the discharging load is disconnected with the storage battery pack.
Further, still include: a third relay and a fourth relay;
the third relay comprises a coil and a normally closed contact; the normally closed contact of the third relay is arranged in the discharging load control circuit and is connected with the normally open contacts of the first contactor and the first relay in series;
the fourth relay comprises a coil and a normally open contact; wherein the input end is connected in series with the diode; the normally open contact and the third relay are connected between the positive electrode and the negative electrode of the direct current bus in series;
when the diode breaks down, a coil of the fourth relay is electrified; the normally open contact of the fourth relay is closed; a coil of the third relay is electrified; the normally closed contact of the third relay is changed from closed to open; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
Further, still include: a fourth relay;
the fourth relay comprises a coil and a normally closed contact; wherein the input end is connected in series with the diode; the normally closed contact is arranged in the discharge load control circuit; the normally open contacts of the first contactor and the first relay are connected in series;
when the diode breaks down, a coil of the fourth relay is electrified; the normally closed contact of the fourth relay is disconnected; when the first contactor is powered off, the normally open contact of the first contactor is disconnected; the discharge load is disconnected from the battery pack and the checkup discharge is completed.
Further, still include: the normally open contacts of the first contactor comprise a first normally open contact and a second normally open contact;
the first normally open contact is arranged between the discharge load and the positive direct current bus;
the second normally open contact is arranged between the discharge load and the negative direct current bus.
Further, still include: the second contactor is arranged between the input end of the rectifying device and the alternating current power supply;
the second contactor comprises a coil and a normally open contact; the normally open contact of the second contactor is arranged in the discharge load control circuit; the normally open contacts of the first contactor and the first relay of the contactor are connected in series;
when the alternating current power supply is in fault outage, the coil of the second contactor loses power, the normally open contact of the second contactor becomes disconnected, the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
The embodiment of the invention has the following advantages:
when the storage battery discharges, the rectifying device does not exit and continues to supply power to the direct current bus, so that the reliability of power supply is improved. When discharging is needed, the switch is pulled open, the coil of the first relay is electrified, and the normally open contact of the first relay is closed; the coil of the first contactor is electrified; the normally open contact of the first contactor is closed, and the discharge load is connected with the storage battery pack to carry out check discharge; thereby automatically realizing the connection between the storage battery pack and the discharge load; the diode can prevent the rectifying device from flowing backwards to the discharging load; and the storage battery pack can supply power to the direct current bus in a standby mode once the rectifying device fails. During discharging, the rectifying device continues to supply power to the direct-current bus; and does not affect the discharge of the storage battery; the safety of the direct current bus is improved. After the rectifying device fails, the storage battery pack can supply power to the direct-current bus; and forming a main and standby power supply mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a dc system of a substation according to an embodiment of the present invention;
fig. 2 is a checking discharge circuit of a storage battery pack of a dc system of a substation according to an embodiment of the present invention;
fig. 3 is another verification discharge circuit of a storage battery pack of a dc system of a substation according to an embodiment of the present invention;
fig. 4 is another verification discharge circuit of a storage battery pack of a dc system of a substation according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a battery test according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another battery test provided in accordance with an embodiment of the present invention;
fig. 7 is another verification discharge circuit of the battery pack of the dc system of the substation provided in the embodiment of the present invention;
fig. 8 is another verification discharge circuit of the battery pack of the dc system of the substation provided in the embodiment of the present invention;
fig. 9 is another verification discharge circuit of the battery pack of the dc system of the substation provided in the embodiment of the present invention;
fig. 10 is a schematic diagram of another alternative substation dc system battery pack verification discharge circuit according to an embodiment of the present invention;
fig. 11 is another verification discharge circuit of the battery pack of the dc system of the substation according to the embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following first introduces some basic concepts of the electrical engineering profession to which the present application relates:
a relay: an electronic control device comprises a coil and a contact; the coil has two states of power-on and power-off, and in a circuit diagram, the coil is generally in a loop; the contact is in another loop; the contact has two states of closing and opening; the coil can be controlled to be electrified or deenergized in a loop where the coil is located; whether the coil is electrified or not is judged so as to control the state switching of the closing or opening of the contact; thereby controlling the connection or disconnection of the circuit in which the contact is positioned. The contacts include normally closed contacts and normally open contacts. The principle of the contactor is the same as that of the relay.
Normally open contact: when the coil is not electrified, the contact of the relay in the off state is a normally open contact. After the coil is changed from power-off to power-on, the normally open contact is changed from open to closed;
the normally closed contact is in a closed state when a coil of the relay is powered off; when the coil of the relay is energized, the normally closed contact is changed from a closed state to an open state.
The direct current system of the transformer substation is an important component of the transformer substation; the direct current system of the transformer substation provides reliable direct current power supplies for control, signals, relay protection, automatic devices, emergency lighting and the like in the transformer substation. Referring to fig. 1, a schematic structural diagram of a dc system of a substation is shown; the system comprises: positive and negative direct current buses; a rectifying device 10, a battery 11, and a discharge load 12; the positive and negative direct current buses can supply power to other electrified equipment; the rectifying device 10, the storage battery 11 and the discharging load 12 are arranged between a positive power line and a negative power line of the direct current bus in parallel; the rectifying device 10 is used for rectifying alternating current into direct current and then outputting the direct current to the direct current bus; a battery pack 11 for charging through a dc bus; and the operating rules stipulate that the storage battery pack 11 needs to be subjected to discharge experiments periodically, so that a discharge load 12 is arranged;
in the discharge experiment, the storage battery pack 11 is used for supplying power to the discharge load 12 independently; the rectifying device 10 must be pushed out, if not withdrawn, as shown in the figure, the rectifying device 10 also discharges the discharging load, which affects the experiment of the storage battery pack; and if the rectifying device 10 does not exit, when the storage battery is subjected to a discharge experiment, a part of current flows into the rectifying device 10 through the direct current bus, so that a high-frequency module in the rectifying device 10 is overheated, and overheating protection is caused. The rectifying device 10 must be disconnected from the dc bus when the battery pack is subjected to a discharge test. However, if the rectifier device 10 is withdrawn and only the battery pack alone supplies power to the dc bus, the reliability of the power supply is reduced.
Based on this, the present application proposes a checking discharge circuit of a substation dc system storage battery pack, which is shown in fig. 2; the circuit includes:
a rectifying device 10 and a battery module 00;
the rectifying device 10 and the storage battery pack module 00 are connected in parallel between the positive and negative direct-current buses;
the battery module 00 includes: the storage battery pack 11 and the discharge load are connected in parallel between the positive direct current bus and the negative direct current bus;
a switch QF4 is arranged on a positive direct current bus between the rectifying device 10 and the storage battery pack module 00;
further comprising a first relay YJ1 connected in parallel with said switch QF 4; the first relay is a voltage relay; the coil of the first relay YJ1 is connected in parallel with the switch QF 4;
the discharging load control circuit is arranged between the positive direct current bus and the negative direct current bus; the controller is used for controlling whether the discharging load is connected or not; the discharging load control circuit comprises a first contactor ZC and a first relay YJ1 which are connected in series, and normally open contacts of the first relay YJ 1; the coil of the first contactor ZC and the normally open contact of the first relay YJ1 are connected between the positive and negative direct current buses in series; a normally open contact of the first contactor ZC is arranged between the discharge load and the direct current bus; when the normally open contact of the first contactor ZC is closed, a discharging load is connected to a direct current bus and connected with a storage battery pack; when the normally open contact of the first contactor ZC is disconnected, the discharging load is disconnected with the direct current bus, and the storage battery pack is disconnected;
when the switch QF4 is changed from closed to open, the coil of the first relay YJ1 is electrified, and the normally open contact of the first relay YJ1 is closed; the coil of the first contactor ZC is energized; a normally open contact of the first contactor ZC is closed, and a discharge load is connected with a storage battery pack to carry out check discharge;
when the switch QF4 is changed from open to closed, the coil of the first relay YJ1 loses electricity, and the normally open contact of the first relay YJ1 is opened; and (3) the coil of the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
When the storage battery pack is subjected to a discharge experiment, the rectifying device 10 does not exit and keeps supplying power to the direct-current bus; however, since the rectifying device 10 is not turned off, there is a possibility that the electric power of the rectifying device 10 may flow into the discharge load 12, and in order to avoid the above, the switch QF4 is provided on the positive power supply line of the dc bus; when a discharge experiment is to be carried out, the switch QF4 is firstly switched off; the connection of the rectifying device is cut off; then, the discharge experiment was performed.
With the circuit of the present application, when a discharge experiment is performed on the battery pack, only the switch QF4 needs to be turned off, and the electric energy output by the rectifying device 10 cannot flow into the discharge load 12; so that the reverse pouring of the electric energy of the direct current bus into the discharging load 12 can be prevented; the discharge test of the battery pack 11 is prevented from being affected.
In one embodiment, in order to avoid the loss of power of a direct current bus caused by the failure of a rectifying device due to alternating current, the application also provides a diode, which is referred to as another substation direct current system storage battery pack consistency discharge circuit shown in fig. 3; the discharge circuit also comprises a diode D1 connected in parallel with the switch QF 4; the cathode of the diode D1 is connected with the first end of the switch QF 4; the anode of the diode D1 is connected with the second end of the switch QF 4; a first end of the switch QF4 is connected with the rectifying device 10 through a positive direct current bus; the second end is connected to the battery pack module 00 through a positive dc bus. As shown, the dc bus is divided into two parts by the switch QF 4; respectively, a first portion connected to the fairing 10; a second section connected to battery module 00; if the rectifying device 10 cannot supply power to the direct current bus of the first part due to the reasons of alternating current power supply failure and the like; the cathode voltage of the diode D1 is less than the anode voltage, and the diode D1 is turned on; battery pack 11 supplies power to the dc bus of the first section through diode D1; thus, the direct current bus of the first part is prevented from losing power.
If only one normally open contact of the first contactor ZC is arranged, the safety is not high, and the fault condition of a single normally open contact is not eliminated; therefore, in one embodiment, the normally open contacts of the first contactor ZC are set to two, see another substation dc system battery pack consistency discharge circuit shown in fig. 4, and include a first normally open contact ZC1 and a second normally open contact ZC 2; the normally open contact ZC1 is arranged between the discharge load 12 and the positive direct current bus; normally open contact ZC2 is disposed between discharge load 12 and the negative dc bus. Therefore, the on-off of the discharging load and each direct current bus can be controlled respectively; the safety factor is improved, and the switching failure caused by single normally open contact failure is avoided.
The operating rules specify that the output voltage value of the battery pack cannot be lower than a predetermined voltage value, and in order to implement the monitoring of the battery pack, in one embodiment, the method further comprises: a second relay YJ 2; the second relay YJ2 is a voltage relay YJ 2; the second relay YJ2 is connected with a storage battery pack; referring to fig. 5, a schematic diagram of a battery test is shown; the second relay YJ2 is connected with a storage battery pack; in specific implementation, an inspection device can be arranged between the relay and the battery pack; when the detected output voltage value of the battery pack is lower than a predetermined threshold value; the size of the threshold value can be flexibly set, and the application is not limited; for example, the normal voltage of a single cell is between 2.2 volts and 2.5 volts; the number is between 104 and 108; the standard threshold value of the terminal voltage of the storage battery pack is 198 volts; if the voltage detected by the voltage relay YJ2 is lower than 198V, the voltage relay YJ2 acts;
the second relay YJ2 includes a normally open contact; a normally open contact of a second relay YJ2 is provided in the discharge load control circuit; the normally open contacts of the first contactor ZC and the first relay YJ1 are connected in series;
when the output voltage of the storage battery pack is lower than a preset threshold value, a normally open contact of the second relay YJ2 is opened; and when the coil of the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected, and the discharging load is disconnected with the storage battery pack.
The method realizes the problem of adjusting and controlling whether the discharging load is accessed according to the electric quantity of the storage battery; if the electric quantity of the storage battery is too low and the voltage is too low, the connection circuit of the discharging load and the storage battery pack is disconnected, so that the electric energy of the storage battery is saved; the storage battery preferentially supplies power to the direct current bus; if the battery is sufficiently charged and the voltage is above the safe voltage threshold, a discharge experiment can be performed.
In one embodiment, the charge of each battery may be detected, the charge threshold of each battery is set to 1.8 v, and if the charge of one single battery is lower than 1.8 v, the second relay YJ2 is activated to disconnect the discharging load from the battery pack, and stop discharging. In specific implementation, a voltage acquisition inspection device can be adopted, and the other battery detection schematic diagram shown in the attached figure 6 is shown; the circuit also comprises a voltage acquisition inspection device; is provided between the second relay YJ2 and the battery pack; the device can be realized by adopting a battery polling instrument which can be used for detecting the voltage of each battery; and transmitting the detected voltage value of each battery to a voltage relay; as long as the voltage of one battery is below a predetermined threshold; the second relay YJ2 acts, and the normally open contact of the second relay YJ2 is opened; and when the coil of the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected, and the discharging load is disconnected with the storage battery pack. The second relay YJ2 is a voltage relay.
After the diode D1 breaks down, the rectifying device can directly supply power to the discharging load; in order to prevent the problems caused by the breakdown of the diode D1, the following technical scheme is adopted in the application;
a relay YJ1 connected with two ends of the switch QF4 in parallel; when the diode D1 breaks down, the coil of the relay YJ1 loses power; the normally open contact of YJ1 is opened, so that relay ZC is de-energized; the normally open contacts of ZC open, cutting off the discharging load.
For greater safety, a hall element or relay may also be used in series with diode D1 in one implementation; when the diode D1 breaks down, a breakdown current is induced; the input end of the Hall switch can sense a changing magnetic field; thereby controlling the action of the output end; after the diode is broken down, a coil of the relay is electrified, and a contact of the relay acts; thereby controlling the on-off state of the discharge load control circuit; and further controlling whether the discharging load is connected with the storage battery pack.
The following is described in three specific embodiments:
the first mode further includes: a third relay ZJ and a hall switch 71; referring to fig. 7, another alternative substation dc system battery pack verification discharge circuit is shown;
the third relay ZJ includes a coil and a normally closed contact; a normally closed contact of the third relay ZJ is arranged in the discharging load control circuit and is connected with the first contactor ZC and a normally open contact of the first relay in series;
the Hall switch comprises an input end and an output end; wherein the input end is connected in series with the diode; the output end and the third relay ZJ are connected in series between the positive electrode and the negative electrode of the direct current bus;
when the diode breaks down, the output end of the Hall switch is changed from open to closed, and the coil of the third relay ZJ is electrified;
the normally closed contact of the third relay ZJ changes from closed to open; and the coil of the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected, the discharge load is disconnected with the storage battery pack, and the check discharge is finished.
In a second mode, the method further includes: a third relay ZJ and a fourth relay 81; referring to fig. 8, another alternative substation dc system battery pack verification discharge circuit is shown; wherein, the fourth relay is a direct current relay;
the third relay ZJ includes a coil and a normally closed contact; a normally closed contact of the third relay ZJ is arranged in the discharging load control circuit and is connected with the first contactor ZC and a normally open contact of the first relay in series;
the fourth relay 81 includes a coil and a normally open contact; wherein the input end is connected in series with the diode; the normally open contact and the third relay ZJ are connected in series between the positive electrode and the negative electrode of the direct current bus;
when the diode breaks down, a coil of the fourth relay is electrified; the normally open contact 81 of the fourth relay is closed; the coil of the third relay ZJ is electrified; the normally closed contact of the third relay ZJ changes from closed to open; and the coil of the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected, the discharge load is disconnected with the storage battery pack, and the check discharge is finished.
In a third aspect, the method further comprises: a fourth relay 91; referring to fig. 9, another alternative substation dc system battery pack verification discharge circuit is shown;
the fourth relay 91 includes a coil and a normally closed contact; wherein the input end is connected in series with the diode; the normally closed contact is arranged in the discharge load control circuit; the normally open contacts of the first contactor ZC and the first relay YJ1 are connected in series;
when the diode breaks down, the coil of the fourth relay 91 is energized; the normally closed contact of the fourth relay 91 is opened; when the first contactor ZC loses power, the normally open contact of the first contactor ZC is disconnected; the discharge load is disconnected from the battery pack and the checkup discharge is completed.
Considering that if the alternating current fails, the rectifying device is powered off, and the current output to the direct current bus by the rectifying device is zero; in one embodiment, the method further comprises: the second contactor is arranged between the input end of the rectifying device and the alternating current power supply; referring to fig. 10, another alternative substation dc system battery pack verification discharge circuit is shown; the second contactor KM comprises a coil and a normally open contact; a normally open contact of the second contactor KM is arranged in the discharging load control circuit; the normally open contacts of the first contactor ZC and the first relay YJ1 are connected in series;
when the alternating current power supply is in fault outage, the coil of the second contactor KM is powered off, the normally open contact of the second contactor KM is disconnected, the coil of the first contactor ZC is powered off, the normally open contact of the first contactor ZC is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharging is finished.
The check discharge circuit of the storage battery pack of the direct current system of the transformer substation is described in detail below; referring to fig. 11, another alternative substation dc system battery pack verification discharge circuit is shown;
the normal operation mode of the original direct current system is as follows: the QF1, QF2 and QF3 switches are all in a closed state, the direct current bus is powered by the rectifying device, and the storage battery pack is in a floating charging standby state. In the prior art, when the storage battery pack is subjected to check discharge: the switch QF1 is opened and the rectifier is withdrawn. The storage battery pack is connected to a discharge load; because the direct current bus is singly supplied with power by the storage battery pack, the reliability is poor.
The application makes the following improvements:
1) a switch QF4 is additionally arranged in an anode loop between the storage battery pack and the direct-current bus, and a diode D1 is connected in parallel between the upper end of the switch QF4 and the anode fuse FU 1; the anode of the diode D1 is connected with the direction of the storage battery pack; the cathode is connected with the direction of the direct current bus.
When the storage battery pack is subjected to check discharge, the switch QF4 is switched off, the rectifying device cuts off the output of a circuit of the storage battery pack due to the reverse direction of the diode, and the storage battery pack is kept in a direct-current bus power supply state;
after the switch QF4 is turned off, the discharging load starting loop is automatically switched on; because the coil of the voltage relay YJ1 is electrified, the normally open contact is closed; a loop where the contactor ZC is positioned is connected with a power supply; the ZC coil of the contactor is electrified, normally closed contacts ZC1 and ZC2 are respectively closed, and a discharge load is communicated with a storage battery pack;
the battery pack is in a standby state in which the dc bus is turned on by the forward direction of the diode. If the rectifying device fails, the diode is conducted, and the storage battery pack supplies power to the direct-current bus;
when the check discharge of the storage battery is realized, the rectifying device and the storage battery pack are in a state of supplying power to the direct current bus, so that the reliability of power supply of a direct current system is ensured.
2) After the switch QF4 is turned off, the discharging load automatically turns on the battery pack:
a control circuit is provided that includes contactor ZC, the normally open contact of voltage relay YJ1, the normally open contact of voltage relay YJ2, the normally closed contact of intermediate relay ZJ and the normally open contact of ac relay JC connected in series between positive and negative dc buses.
A voltage relay YJ1 is connected in parallel with the two ends of the switch QF4, when the switch QF4 is in a closed state during normal operation, the switch QF4 is pulled open during battery check discharge, a voltage difference is generated between the two ends of the switch QF4, the voltage relay YJ1 acts, a normally open contact YJ1 is closed, and an excitation loop of the direct current contactor ZC is connected;
it is worth emphasizing that at this moment, the contacts JC, YJ2, ZJ are all closed; because the AC power supply is normal at the moment, a normally open contact JC of the AC contactor JC is closed; the voltage of the storage battery is normal, so the voltage relay YJ2 does not act, and the contact YJ2 keeps a closed state; the hall switch does not act, the intermediate relay ZJ is not energized, and the contact ZJ remains closed.
After the coil of the direct current contactor ZC is electrified, the normally open contacts ZC1 and ZC2 of the direct current contactor ZC are closed, a discharging load is connected, and the storage battery pack discharges.
3) Improvement of preventive measures after diode breakdown:
when the switch QF4 is turned on and the diode D1 is broken down, the voltage at two ends of a coil of the voltage relay YJ1 is zero, the coil of the voltage relay YJ1 is demagnetized, a normally open contact YJ1 is opened, an excitation loop of the direct current contactor ZC is disconnected, normally open contacts ZC1 and ZC2 of the direct current contactor ZC are opened, a discharging load is disconnected, and the storage battery pack stops discharging. The rectifier device is prevented from supplying power to a discharging load after the diode is broken down, the safe power supply of a direct current system is prevented from being influenced, and the spare capacity of the storage battery pack is reserved to the maximum extent.
4) The Hall switch is additionally arranged in a discharge loop, when a diode breaks down, a rectifying device outputs a large current to a discharge load through a direct current bus, the Hall switch acts because the sensed current reaches an action value by utilizing the principle of Hall effect, the starting loop of an intermediate relay ZJ is switched on, the intermediate relay ZJ acts, a normally closed contact ZJ1 is opened, an excitation loop of a direct current contactor ZC is switched off, normally open contacts ZC1 and ZC2 of the direct current contactor are opened, the discharge load is switched off, the storage battery stops discharging, the rectifying device is prevented from supplying power to the discharge load after the diode breaks down, the safe power supply of a direct current system is influenced, and the spare capacity of the storage battery is reserved to the maximum extent.
It is worth emphasizing that the direct current relay can be adopted to realize the direct current relay besides the Hall switch; the coil of the relay is connected with a diode D1 in series; the contact of the relay is connected with a loop where the ZC coil is located; when the diode D1 breaks down, the coil of the direct current relay is electrified, and the contact point acts; thereby controlling the on-off of the ZC loop; and further controls the opening and closing of the contacts ZC1 and ZC 2.
5) An alternating current contactor JC is additionally arranged at an alternating current input end of a rectifying device, when an alternating current power supply fails, the rectifying device automatically exits, the alternating current contactor JC is demagnetized, a normally open electric shock JC1 disconnects an excitation loop of a direct current contactor ZC, normally open contacts ZC1 and ZC2 of the direct current contactor ZC are opened, a discharging load is disconnected, and a storage battery pack stops discharging. The spare capacity of the storage battery pack is reserved to the maximum extent when the alternating current power supply fails.
6) The method is characterized in that a voltage acquisition and inspection function is utilized, a digital voltage relay is additionally arranged on a voltage acquisition and inspection device, the measured voltage of a single battery is converted into digital quantity, when the voltage of the single battery is reduced to a discharge termination voltage value specified by a regulation, a voltage relay contact YJ2 is opened, an excitation loop of a direct current contactor ZC is disconnected, normally open contacts ZC1 and ZC2 of the direct current contactor ZC are opened, a discharge load is disconnected, and a storage battery stops discharging. When a single battery fails, the safe power supply of a direct current system is prevented from being influenced, and the reserve capacity of the storage battery pack is reserved to the maximum extent.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. A check discharge circuit of a storage battery pack of a direct current system of a transformer substation is characterized by comprising:
a rectifying device and a storage battery module; the rectifying device and the storage battery pack module are connected in parallel between the positive and negative direct-current buses; the battery pack module includes: the storage battery pack and the discharge load are connected in parallel between the positive direct current bus and the negative direct current bus; a switch is arranged on a positive direct current bus between the rectifying device and the storage battery pack module;
the first relay is connected with the switch in parallel; the coil of the first relay is connected with the switch in parallel;
the discharging load control circuit is arranged between the positive direct current bus and the negative direct current bus; the controller is used for controlling whether the discharging load is connected or not; the discharging load control circuit comprises a first contactor and a normally open contact of a first relay which are connected in series; the coil of the first contactor and the normally open contact of the first relay are connected in series between the positive and negative direct current buses; the normally open contact of the first contactor is arranged between the discharge load and the direct current bus; when the normally open contact of the first contactor is closed, the discharging load is connected to the direct current bus and connected with the storage battery pack; when the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the direct current bus, and the storage battery pack is disconnected;
when the switch is changed from being closed to being opened, a coil of the first relay is electrified, and a normally open contact of the first relay is closed; the coil of the first contactor is electrified; the normally open contact of the first contactor is closed, and the discharge load is connected with the storage battery pack to carry out check discharge;
when the switch is changed from off to on, the coil of the first relay loses power, and the normally open contact of the first relay is disconnected; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
2. The substation direct current system battery pack consistency discharge circuit of claim 1, further comprising: a diode connected in parallel with the switch; the cathode of the diode is connected with the first end of the switch; the anode of the diode is connected with the second end of the switch; the first end of the switch is connected with the rectifying device through the positive direct current bus; the second end is connected with the storage battery pack module through a positive direct current bus.
3. The substation direct current system battery pack consistency discharge circuit of claim 1, further comprising: a second relay; the second relay is connected with the storage battery pack;
the second relay comprises a normally open contact; a normally open contact of a second relay is arranged in the discharging load control circuit; the normally open contacts of the first contactor and the first relay are connected in series;
when the output voltage of the storage battery pack is lower than a preset threshold value, the normally open contact of the second relay is disconnected; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, and the discharging load is disconnected with the storage battery pack.
4. The substation direct current system battery pack consistency discharge circuit of claim 2, further comprising: a third relay and a fourth relay;
the third relay comprises a coil and a normally closed contact; the normally closed contact of the third relay is arranged in the discharging load control circuit and is connected with the normally open contacts of the first contactor and the first relay in series;
the fourth relay comprises a coil and a normally open contact; wherein the input end is connected in series with the diode; the normally open contact and the third relay are connected between the positive electrode and the negative electrode of the direct current bus in series;
when the diode breaks down, a coil of the fourth relay is electrified; the normally open contact of the fourth relay is closed; a coil of the third relay is electrified; the normally closed contact of the third relay is changed from closed to open; and when the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
5. The substation direct current system battery pack consistency discharge circuit of claim 2, further comprising: a fourth relay;
the fourth relay comprises a coil and a normally closed contact; wherein the input end is connected in series with the diode; the normally closed contact is arranged in the discharge load control circuit; the normally open contacts of the first contactor and the first relay are connected in series;
when the diode breaks down, a coil of the fourth relay is electrified; the normally closed contact of the fourth relay is disconnected; when the first contactor is powered off, the normally open contact of the first contactor is disconnected; the discharge load is disconnected from the battery pack and the checkup discharge is completed.
6. The substation direct current system battery pack consistency discharge circuit of claim 1, further comprising: the normally open contacts of the first contactor comprise a first normally open contact and a second normally open contact;
the first normally open contact is arranged between the discharge load and the positive direct current bus;
the second normally open contact is arranged between the discharge load and the negative direct current bus.
7. The substation direct current system battery pack verification discharge circuit of any one of claims 1 to 6, further comprising: the second contactor is arranged between the input end of the rectifying device and the alternating current power supply;
the second contactor comprises a coil and a normally open contact; the normally open contact of the second contactor is arranged in the discharge load control circuit; the normally open contacts of the first contactor and the first relay of the contactor are connected in series;
when the alternating current power supply is in fault outage, the coil of the second contactor loses power, the normally open contact of the second contactor becomes disconnected, the coil of the first contactor loses power, the normally open contact of the first contactor is disconnected, the discharging load is disconnected with the storage battery pack, and the check discharge is finished.
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| CN201911244918.XA CN110994721B (en) | 2019-12-06 | 2019-12-06 | Transformer substation direct current system storage battery pack checking discharge circuit |
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| CN201911244918.XA CN110994721B (en) | 2019-12-06 | 2019-12-06 | Transformer substation direct current system storage battery pack checking discharge circuit |
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