CN104065154A - Frequency changer emergency power supply system - Google Patents
Frequency changer emergency power supply system Download PDFInfo
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- CN104065154A CN104065154A CN201410250307.7A CN201410250307A CN104065154A CN 104065154 A CN104065154 A CN 104065154A CN 201410250307 A CN201410250307 A CN 201410250307A CN 104065154 A CN104065154 A CN 104065154A
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Abstract
A frequency changer emergency power supply system comprises a frequency changer formed by connecting an AC/DC rectifier and a DC/AC inverter in series, an energy storing device, a bidirectional DC/DC converter and a battery management system. Operating modes of the bidirectional DC/DC converter comprise a stopping mode, a charging mode, a discharging mode and a voltage stabilizing mode, the result of normal power supplying or occurrence of faults in a power grid is judged by a man-machine interaction module and a protection controlling and alarming module of the battery management system according to the power grid voltage detected by a voltage transformer mounted on the power grid side, and the switching of the bidirectional DC/DC converter among the operation modes is controlled. Emergence power can be supplied to an alternating load when the power grid breaks down. After the fact that the normal power supply of the voltage of the power grid is conducted for 10 s is detected by the voltage transformer mounted on the power grid side, the operating mode of the bidirectional DC/DC converter is switched to be the charging mode from the voltage stabilizing mode, an energy storing battery as a current source is connected to a direct current bus, and the reliability of frequency changer emergency power supply can be obviously improved.
Description
Technical field
The present invention relates to emergency service, particularly relate to a kind of frequency converter emergency power supply system.
Background technology
In adjustable-speed drive system, comprise ac/dc (Alternate Current/Direct Current, initialism is AC/DC) rectifier and AC/DC (Direct Current/Alternate Current, initialism is DC/AC) frequency converter of inverter, application variable-frequency driving technique changes operating voltage amplitude and the frequency of alternating current motor, smoothly to control torque and the speed of alternating current motor.Existing frequency converter is all to adopt mains supply, and the AC energy that the power-frequency voltage of electrical network is transformed into another frequency is powered to alternating current motor, once electrical network breaks down, just must within a period of time, stop as alternating current motor power supply.
Summary of the invention
Technical problem to be solved by this invention is the defect that makes up above-mentioned prior art, and a kind of frequency converter emergency power supply system is provided.
Technical problem of the present invention is solved by the following technical programs.
This frequency converter emergency power supply system, comprise the frequency converter, energy storage device, the bidirectional, dc/direct current (Direct Current/Direct Current that by AC/DC rectifier and DC/AC inverter, are composed in series, initialism is DC/DC) converter, and battery management system
Described AC/DC rectifier, its input is connected with civil power through AC circuit breaker, and output is connected with DC bus, during for electrical network normal power supply, the industrial-frequency alternating current of electrical network is transformed to direct current.
Described DC/AC inverter, its input is connected with DC bus, output is connected with AC load, for the direct current of described AC/DC rectifier output being converted to alternating current when electrical network normal power supply, be AC load power supply, when civil power breaks down, the direct current of energy storage device output being converted to alternating current is AC load power supply.
Described energy storage device is used for DC load power supply, and when electrical network breaks down, maintains AC load uninterrupted power supply.
Described two-way DC/DC converter, comprise that it forms the isolation high frequency transformer of identical with a parameter winding and secondary winding, and respectively with a described winding, high-frequency rectification/the inversion unit that secondary winding is connected, secondary high-frequency rectification/inversion unit, the input of the forward DC/DC conversion of a described high-frequency rectification/inversion unit is also the output of reverse DC/DC conversion, be connected with described battery management system with described energy storage device respectively, the output of the forward DC/DC conversion of a described high-frequency rectification/inversion unit is also the input of reverse DC/DC conversion, be connected with described DC bus, described two-way DC/DC converter is used for transmitting bidirectional energy.
The feature of this frequency converter emergency power supply system is:
Described two-way DC/DC converter operational mode comprises stop mode, charge mode, discharge mode and voltage stabilizing pattern; the electrical network normal power supply of being judged by the line voltage that human-computer interaction module is controlled with protection and alarm module detects according to the voltage transformer of grid side installation of described battery management system or the result breaking down, control the switching between described two-way DC/DC converter operational mode.
During electrical network normal power supply, frequency converter is normally worked, by electrical network power taking, after rectification, inversion, being output as AC load powers, and it is stable to maintain DC bus-bar voltage, the operational mode of being controlled described two-way DC/DC converter by the human-computer interaction module of described battery management system is charge mode and discharge mode, at charge mode, charging current value and float charge voltage value are set, described energy storage device is carried out to constant current/constant voltage charging, at discharge mode, discharge current value and discharge power value are set, described energy storage device is carried out to constant current/power electric discharge; Battery system state monitoring module by described battery management system detects voltage, electric current and the temperature of described energy storage device in real time simultaneously; and by data, by RS232 communications, give described two-way DC/DC converter by the communication module of described battery management system; described two-way DC/DC converter is according to the parameter of described energy storage device; Protection parameters is set, and adjust operation pattern and output voltage are reliably protected described energy storage device.
Line voltage is less than 0.2 times of rated voltage, and while maintaining 60s, judge that electrical network breaks down, by the protection control of described battery management system and alarm function module controls change respective switch in two-way DC/DC converter open order by described two-way DC/DC converter operational mode by stop mode, a kind of voltage stabilizing pattern that switches in charge mode and discharge mode, now emergency power supply system is corresponding switches to voltage stabilizing mode of operation by normal mode of operation, by energy storage device described in the Duty ratio control of adjusting respective switch, release energy, make DC bus-bar voltage constant, it after inversion, is AC load emergency service, and to electrical network, described energy storage device and described two-way DC/DC converter are protected self, described electrical network is protected, comprise that timely and electrical network disconnects, prevent that fault incidence from expanding, described energy storage device is protected, comprise described energy storage device is carried out to overvoltage/undervoltage protection, overcurrent protection and overtemperature protection, and direct current overvoltage/undervoltage protection, direct current overcurrent protection, direct-current polarity reverse connecting protection, AC overcurrent protection, exchanged underfrequency protection, exchange overvoltage/undervoltage protection and exchanged underfrequency protection, described two-way DC/DC converter is protected, comprise direct current overcurrent protection, DC over-voltage protection and direct current under-voltage protection.
Line voltage is greater than 0.2 times of rated voltage, and while maintaining 10s, judge power system restoration normal power supply, the order of opening of changing the respective switch in two-way DC/DC converter by protection control and the alarm function module controls of described battery management system switches to charge mode by described two-way DC/DC converter operational mode by voltage stabilizing pattern, now the operational mode of emergency power supply system is corresponding switches to normal mode of operation by voltage stabilizing mode of operation, described energy storage device is connected on DC bus with the form of current source, to improve the reliability of power supply, because the electric network fault shorter is in the time, this frequency converter emergency power supply system can guarantee that AC load normally moves, can significantly improve the reliability of frequency converter emergency service.
Technical problem of the present invention is solved by following further technical scheme.
A high-frequency rectification/inversion unit in described two-way DC/DC converter, it is full-bridge type high-frequency rectification/inverter circuit, comprise that the switching tube of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, by described battery management system, control and change two groups of opening sequentially of totally four switches, realize forward DC/DC conversion and the oppositely switching between DC/DC conversion work.
Secondary high-frequency rectification/inversion unit in described two-way DC/DC converter, its composition is identical with parameter and a high-frequency rectification/inversion unit, also be full-bridge type high-frequency rectification/inverter circuit, comprise that the switching tube of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, by described battery management system, control and change two groups of opening sequentially of totally four switches, realize forward DC/DC conversion and the oppositely switching between DC/DC conversion work.
Described switching tube is insulated gate bipolar translator power tube (Insulated Gate Bipolar Transistor, initialism is IGBT).
Described energy storage device is LiFePO4 energy-storage battery, is to use LiFePO4 as the lithium ion battery of positive electrode.
Described AC load is the AC load of frequency converter.
The AC load of described frequency converter comprises alternating current motor.
Described battery management system; comprise battery system state monitoring module, fault diagnosis module, protection control and alarm function module, battery balanced functional module, heat management functional module, data recordin module, communication module; and human-computer interaction module, described communication module comprises with the RS485 communication interface of host computer centralized monitoring system transmission data or/and ethernet interface.
The present invention's beneficial effect is compared with prior art:
Emergency power supply system of the present invention can be AC load emergency service when electrical network breaks down.After the voltage transformer detection of grid voltage of installing in grid side recovers normal power supply 10s, two-way DC/DC converter operational mode switches to charge mode by voltage stabilizing pattern, energy-storage battery is connected on DC bus with the form of current source, can significantly improve the reliability of frequency converter emergency service.
Accompanying drawing explanation
Fig. 1 is the system composition diagram of the specific embodiment of the invention;
Fig. 2 is the main circuit topological structure figure of the two-way DC/DC converter of Fig. 1.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention will be described.
A kind of as Fig. 1, frequency converter emergency power supply system shown in 2, comprise the frequency converter 4 being composed in series by AC/DC rectifier 2 and DC/AC inverter 3, LiFePO4 energy-storage battery 6, two-way DC/DC converter 5, and comprise battery system state monitoring module, fault diagnosis module, protection is controlled and alarm function module, battery balanced functional module, heat management functional module, data recordin module, communication module, and the battery management system 7 of human-computer interaction module, wherein communication module comprises with the RS485 communication interface of host computer 9 centralized monitoring system transmission data or/and ethernet interface.
The input of AC/DC rectifier 2 is connected with civil power through AC circuit breaker 1, and output is connected with DC bus 10, during for electrical network normal power supply, the industrial-frequency alternating current of electrical network is transformed to direct current, the input of DC/AC inverter 3 is connected with DC bus 10, output is connected with the AC load 8 that comprises the frequency converter of alternating current motor, for the direct current of AC/DC rectifier 2 outputs is converted to alternating current when electrical network normal power supply, be AC load 8 power supplies, the direct current of energy-storage battery 6 outputs being converted to alternating current when civil power breaks down is AC load 8 power supplies, LiFePO4 energy-storage battery 6 is for to DC load 11 power supply, and when electrical network breaks down, maintains AC load 8 uninterrupted power supplies, two-way DC/DC converter 5 comprises that it forms the isolation high frequency transformer of identical with a parameter winding and secondary winding, and respectively with a winding, high-frequency rectification/the inversion unit that secondary winding is connected, secondary high-frequency rectification/inversion unit, the input of the forward DC/DC conversion of a high-frequency rectification/inversion unit is also the output of reverse DC/DC conversion, be connected with battery management system 7 with energy-storage battery 6 respectively, the output of the forward DC/DC conversion of a high-frequency rectification/inversion unit is also the input of reverse DC/DC conversion, be connected with DC bus 10, two-way DC/DC converter 5 is for transmitting bidirectional energy.
A high-frequency rectification/inversion unit in two-way DC/DC converter 5, it is full-bridge type high-frequency rectification/inverter circuit, comprise that IGBT switching tube S1 ~ S4 of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, secondary high-frequency rectification/inversion unit in two-way DC/DC converter 5, its composition is identical with parameter and a high-frequency rectification/inversion unit, also be full-bridge type high-frequency rectification/inverter circuit, comprise that IGBT switching tube S5 ~ S8 of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, by battery management system 7 control high-frequency rectification/inversion unit in the two-way DC/DC converter 5 of change and secondary high-frequency rectification/inversion unit four groups totally eight switches open order, realize forward DC/DC conversion and the oppositely switching between DC/DC conversion work.
The operational mode of two-way DC/DC converter 5 comprises stop mode, charge mode, discharge mode and voltage stabilizing pattern; the electrical network normal power supply of the line voltage judgement being detected by the human-computer interaction module of battery management system 7 and protection is controlled and alarm module is installed according to grid side voltage transformer or the result breaking down, control the switching between the operational mode of two-way DC/DC converter 5.
During electrical network normal power supply, frequency converter is normally worked, by electrical network power taking, after rectification, inversion, be output as AC load power supply 8, and maintain DC bus 10 voltage stabilizations, the operational mode of being controlled two-way DC/DC converter 5 by the human-computer interaction module of battery management system 7 is charge mode and discharge mode, at charge mode, charging current value and float charge voltage value are set, LiFePO4 energy-storage battery 6 is carried out to constant current/constant voltage charging, at discharge mode, discharge current value and discharge power value are set, LiFePO4 energy-storage battery 6 is carried out to constant current/power electric discharge; By the battery system state monitoring module of battery management system 7, detected in real time voltage, electric current and the temperature of LiFePO4 energy-storage battery 6 simultaneously; and by data, by RS232 communications, give two-way DC/DC converter 5 by the communication module of battery management system 7; two-way DC/DC converter 5 is according to the parameter of LiFePO4 energy-storage battery 6; Protection parameters is set, and adjust operation pattern and output voltage are reliably protected LiFePO4 energy-storage battery 6.
Line voltage is less than 0.2 times of rated voltage, and while maintaining 60s, judge that electrical network breaks down, by the protection control of battery management system 7 and alarm function module controls change high-frequency rectification/inversion unit in two-way DC/DC converter 5 and secondary high-frequency rectification/inversion unit four groups totally eight switches open order by the operational mode of two-way DC/DC converter 5 by stop mode, a kind of voltage stabilizing pattern that switches in charge mode and discharge mode, now emergency power supply system is corresponding switches to voltage stabilizing mode of operation by normal mode of operation, by regulate high-frequency rectification/inversion unit in two-way DC/DC converter 5 and secondary high-frequency rectification/inversion unit four groups the Duty ratio control LiFePO4 energy-storage battery 6 of totally eight switches release energy, make DC bus 10 voltage constants, after inversion, be AC load 7 emergency services, and to electrical network, LiFePO4 energy-storage battery 6 and two-way DC/DC converter 5 are protected self, electrical network is protected, comprise that timely and electrical network disconnects, prevent that fault incidence from expanding, LiFePO4 energy-storage battery 6 is protected, comprise LiFePO4 energy-storage battery 6 is carried out to overvoltage/undervoltage protection, overcurrent protection and overtemperature protection, and direct current overvoltage/undervoltage protection, direct current overcurrent protection, direct-current polarity reverse connecting protection, AC overcurrent protection, exchanged underfrequency protection, exchange overvoltage/undervoltage protection and exchanged underfrequency protection, two-way DC/DC converter 5 is protected, comprise direct current overcurrent protection, DC over-voltage protection and direct current under-voltage protection.
Line voltage is greater than 0.2 times of rated voltage, and while maintaining 10s, judge power system restoration normal power supply, by the protection control of battery management system 7 and alarm function module controls change high-frequency rectification/inversion unit in two-way DC/DC converter 5 and secondary high-frequency rectification/inversion unit four groups the order of opening of totally eight switches the operational mode of two-way DC/DC converter 5 is switched to charge mode by voltage stabilizing pattern, now the operational mode of emergency power supply system is corresponding switches to normal mode of operation by voltage stabilizing mode of operation, LiFePO4 energy-storage battery 6 is connected on DC bus 10 with the form of current source, to improve the reliability of power supply, because the electric network fault shorter is in the time, this frequency converter emergency power supply system can guarantee that AC load 7 normally moves, can significantly improve the reliability of frequency converter emergency service.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make without departing from the inventive concept of the premise some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the present invention by the definite scope of patent protection of submitted to claims.
Claims (8)
1. a frequency converter emergency power supply system, comprises the frequency converter, energy storage device, the two-way DC/DC converter that by AC/DC rectifier and DC/AC inverter, are composed in series, and battery management system,
Described AC/DC rectifier, its input is connected with civil power through AC circuit breaker, and output is connected with DC bus, during for electrical network normal power supply, the industrial-frequency alternating current of electrical network is transformed to direct current;
Described DC/AC inverter, its input is connected with DC bus, output is connected with AC load, for the direct current of described AC/DC rectifier output being converted to alternating current when electrical network normal power supply, be AC load power supply, when civil power breaks down, the direct current of energy storage device output being converted to alternating current is AC load power supply;
Described energy storage device is used for DC load power supply, and when electrical network breaks down, maintains AC load uninterrupted power supply;
Described two-way DC/DC converter, comprise that it forms the isolation high frequency transformer of identical with a parameter winding and secondary winding, and respectively with a described winding, high-frequency rectification/the inversion unit that secondary winding is connected, secondary high-frequency rectification/inversion unit, the input of the forward DC/DC conversion of a described high-frequency rectification/inversion unit is also the output of reverse DC/DC conversion, be connected with described battery management system with described energy storage device respectively, the output of the forward DC/DC conversion of a described high-frequency rectification/inversion unit is also the input of reverse DC/DC conversion, be connected with described DC bus, described two-way DC/DC converter is used for transmitting bidirectional energy,
It is characterized in that:
Described two-way DC/DC converter operational mode comprises stop mode, charge mode, discharge mode and voltage stabilizing pattern, the electrical network normal power supply of being judged by the line voltage that human-computer interaction module is controlled with protection and alarm module detects according to the voltage transformer of grid side installation of described battery management system or the result breaking down, control the switching between described two-way DC/DC converter operational mode;
During electrical network normal power supply, frequency converter is normally worked, by electrical network power taking, after rectification, inversion, being output as AC load powers, and it is stable to maintain DC bus-bar voltage, the operational mode of being controlled described two-way DC/DC converter by the human-computer interaction module of described battery management system is charge mode and discharge mode, at charge mode, charging current value and float charge voltage value are set, described energy storage device is carried out to constant current/constant voltage charging, at discharge mode, discharge current value and discharge power value are set, described energy storage device is carried out to constant current/power electric discharge; Battery system state monitoring module by described battery management system detects voltage, electric current and the temperature of described energy storage device in real time simultaneously, and by data, by RS232 communications, give described two-way DC/DC converter by the communication module of described battery management system, described two-way DC/DC converter is according to the parameter of described energy storage device, Protection parameters is set, and adjust operation pattern and output voltage are reliably protected described energy storage device;
Line voltage is less than 0.2 times of rated voltage, and while maintaining 60s, judge that electrical network breaks down, by the protection control of described battery management system and alarm function module controls change respective switch in two-way DC/DC converter open order by described two-way DC/DC converter operational mode by stop mode, a kind of voltage stabilizing pattern that switches in charge mode and discharge mode, now emergency power supply system is corresponding switches to voltage stabilizing mode of operation by normal mode of operation, by energy storage device described in the Duty ratio control of adjusting respective switch, release energy, make DC bus-bar voltage constant, it after inversion, is AC load emergency service, and to electrical network, described energy storage device and described two-way DC/DC converter are protected self, described electrical network is protected, comprise that timely and electrical network disconnects, prevent that fault incidence from expanding, described energy storage device is protected, comprise described energy storage device is carried out to overvoltage/undervoltage protection, overcurrent protection and overtemperature protection, and direct current overvoltage/undervoltage protection, direct current overcurrent protection, direct-current polarity reverse connecting protection, AC overcurrent protection, exchanged underfrequency protection, exchange overvoltage/undervoltage protection and exchanged underfrequency protection, described two-way DC/DC converter is protected, comprise direct current overcurrent protection, DC over-voltage protection and direct current under-voltage protection,
Line voltage is greater than 0.2 times of rated voltage, and while maintaining 10s, judge power system restoration normal power supply, the order of opening of changing the respective switch in two-way DC/DC converter by protection control and the alarm function module controls of described battery management system switches to charge mode by described two-way DC/DC converter operational mode by voltage stabilizing pattern, now the operational mode of emergency power supply system is corresponding switches to normal mode of operation by voltage stabilizing mode of operation, described energy storage device is connected on DC bus with the form of current source, to improve the reliability of power supply, because the electric network fault shorter is in the time, this frequency converter emergency power supply system can guarantee that AC load normally moves, can significantly improve the reliability of frequency converter emergency service.
2. frequency converter emergency power supply system as claimed in claim 1, is characterized in that:
A high-frequency rectification/inversion unit in described two-way DC/DC converter, it is full-bridge type high-frequency rectification/inverter circuit, comprise that the switching tube of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, by described battery management system, control and change two groups of opening sequentially of totally four switches, realize forward DC/DC conversion and the oppositely switching between DC/DC conversion work.
3. frequency converter emergency power supply system as claimed in claim 1 or 2, is characterized in that:
Secondary high-frequency rectification/inversion unit in described two-way DC/DC converter, its composition is identical with parameter and a high-frequency rectification/inversion unit, also be full-bridge type high-frequency rectification/inverter circuit, comprise that the switching tube of four each own anti-paralleled diodes on two brachium pontis or body endoparasitism diode forms two groups totally four switches, by described battery management system, control and change two groups of opening sequentially of totally four switches, realize forward DC/DC conversion and the oppositely switching between DC/DC conversion work.
4. frequency converter emergency power supply system as claimed in claim 3, is characterized in that:
Described switching tube is insulated gate bipolar translator power tube IGBT.
5. frequency converter emergency power supply system as claimed in claim 4, is characterized in that:
Described energy storage device is LiFePO4 energy-storage battery, is to use LiFePO4 as the lithium ion battery of positive electrode.
6. frequency converter emergency power supply system as claimed in claim 5, is characterized in that:
Described AC load is the AC load of frequency converter.
7. frequency converter emergency power supply system as claimed in claim 6, is characterized in that:
The AC load of described frequency converter comprises alternating current motor.
8. frequency converter emergency power supply system as claimed in claim 7, is characterized in that:
Described battery management system; comprise battery system state monitoring module, fault diagnosis module, protection control and alarm function module, battery balanced functional module, heat management functional module, data recordin module, communication module; and human-computer interaction module, described communication module comprises with the RS485 communication interface of host computer centralized monitoring system transmission data or/and ethernet interface.
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| CN201410250307.7A CN104065154B (en) | 2014-06-09 | 2014-06-09 | Frequency changer emergency power supply system |
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| CN201410250307.7A CN104065154B (en) | 2014-06-09 | 2014-06-09 | Frequency changer emergency power supply system |
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