CN102255522B - DC (direct current) power supply system control method adapted to deficient output power of three-phase AC (alternating current) power grid - Google Patents
DC (direct current) power supply system control method adapted to deficient output power of three-phase AC (alternating current) power grid Download PDFInfo
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- CN102255522B CN102255522B CN 201110209426 CN201110209426A CN102255522B CN 102255522 B CN102255522 B CN 102255522B CN 201110209426 CN201110209426 CN 201110209426 CN 201110209426 A CN201110209426 A CN 201110209426A CN 102255522 B CN102255522 B CN 102255522B
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Abstract
The invention discloses a DC (direct current) power supply system control method adapted to deficient output power of a three-phase AC (alternating current) power grid. The method comprises the following steps: 1, setting a maximum DC output current value of a DC power supply system by a software parameter setting module; 2, controlling output voltages of all rectification modules to be the present voltages of storage batteries when power supply to the three-phase AC power grid is recovered or the DC power supply system is subjected to the voltage reduction interference; 3, keeping the same number of the rectification modules operating on each phase of the three-phase AC power grid; 4, adjusting the operation numbers of the rectification modules on each phase of the three-phase AC power grid according to the maximum DC output current value of the DC power supply system; and 5, gradually increasing the output voltage of each rectification module in the charging process of the storage batteries and simultaneously decreasing the output current of the rectification modules. By using the method disclosed by the invention, the reliable startup and the stable operation can be ensured when the three-phase AC power grid is underpower.
Description
Technical field
The present invention relates to a kind of control method of DC power system, particularly a kind of DC power system control method that adapts to three-phase alternating current electrical network power output deficiency.
Background technology
DC power system comprises power transformer, rectification circuit, filter circuit, voltage stabilizing circuit that circuit successively connects.The primary coil of described power transformer is connected with three-phase alternating current electrical network circuit.The rectification module of DC power system has the input voltage under-voltage protection function; when the input voltage of rectification module is crossed when low; excessive in order to prevent input current; the input voltage under-voltage protection function will be closed rectification module output; rectification module is quit work; then DC power system can not start, thereby influences the stable operation of load equipment.
DC power system is for load equipment provides main electric power input; And be battery charging; Described batteries provides the non-firm power input for load equipment; Current sensor is used to measure the charging and the discharging current of described batteries; Monitoring unit is adjusted the electric current of each rectification module output of described DC power system according to the current value that described current sensor returns, thereby adjusts total output current of DC power system; Described monitoring unit comprises the parameter setting software module, is used to set the parameters such as charging current limiter value of batteries, and the output maximum current value parameter of control DC power system.
The connection of three-phase alternating current electrical network is divided into the delta connection of three-phase three-wire system and the star connection of three-phase four-wire system.Wherein, three-phase four-wire system comprises three phase lines and a center line.
Wherein, rectification module is a MDQ.Being every phase line is connected a plurality of rectification modules with center line is parallel.
The power output deficiency of three-phase alternating current electrical network, its main cause is: the DC power system input will be connected with the three-phase alternating current electrical network by power line, when its power line is longer, cause the direct impedance of power line bigger, then the electric power part loss of three-phase alternating current electrical network output has limited three-phase alternating current electrical network power output on power line.
Under the situation of three-phase alternating current electrical network power output deficiency, the low excessively phenomenon of alternating voltage can appear, and DC power system can't operate as normal owing to the effect of the input voltage under-voltage protection function of rectification module.In the technology, DC power system is after AC outage for the conventional method that improves the AC network adaptive capacity now, when restoring electricity, make the rectification module output voltage begin output from cell voltage, slow again boosted output voltages enters the charging current limiter state.
But also there is following problem:
One, general DC power system to receive three rectification module quantity on the phase line unequal, all during the rectification modules operation, the electric current that exchanges on the three-phase is unequal.When the three-phase alternating current electrical network adopts the star connection of three-phase four-wire system, be connected with the power line of the input of DC power system when longer in the AC network of three-phase four-wire system, the resistance of its center line self will be big more, influence the unbalance of neutral-point voltage of center line, then the phase current of the triple line of three-phase alternating current electrical network output will be unbalanced, thereby influence the startup and the operation of rectification module of each phase of DC power system;
Two, when phase line and center line be the fine copper lead, line directly is 6mm
2, 1300 meters of length, its theoretical equivalent resistance can reach more than 4 ohm in the time of 25 ℃, and this moment, the rectification module of DC power system can not guarantee reliable the startup and stable operation.When the theoretical equivalent resistance of phase line and center line further increased, DC power system possibly can't start.
Three, after rectification module enters repeatedly starting state, can't enter running status.
Summary of the invention
The invention provides a kind of DC power system control method that adapts to three-phase alternating current electrical network power output deficiency.This DC power system control method can reliable startup and stable operation when three-phase alternating current electrical network power output is not enough.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of DC power system adapts to the control method of three-phase alternating current electrical network power output deficiency, may further comprise the steps:
The first step by the software parameter setting module of DC power system monitoring unit, is set the maximum average anode current value parameter of described DC power system;
Second step, when being subjected to line voltage, three-phase alternating current power system restoration power supply or DC power system disturb when reducing voltage, the output voltage of controlling all rectification modules is the current voltage of batteries, and adjust the maximum output current of described rectification module, the interchange impulse current when starting to reduce rectification module;
The 3rd step equated every quantity that goes up the rectification module of operation mutually of three-phase alternating current electrical network, and adjusts its maximum output current, to guarantee the threephase load balance of three-phase alternating current electrical network, made DC power system can start operation;
The 4th step, in described the 3rd step three-phase alternating current electrical network every mutually under the rectification module quantity of the operation situation about equating, maximum average anode current value parameter according to DC power system in the described first step, adjust every operation quantity that goes up rectification module mutually in the three-phase alternating current electrical network, to improve the efficient of rectification module, DC power system can reliably be started;
The 5th step; after waiting for that DC power system reliably starts in described the 4th step; in the charging process of described batteries, improve the output voltage of described each rectification module gradually; reduce simultaneously the output current of rectification module gradually; keep power output constant, with the stable operation of protection DC power system.
Further, the maximum output current of described rectification module is the maximum average anode current of the described DC power system nominal capacity with described batteries on duty, again divided by the quantity of the rectification module of current operation.
Further, the maximum average anode current value parameter of described DC power system and the nominal capacity of batteries are associated.
In the first step, the software parameter setting module of monitoring unit is mainly used in the maximum average anode current value of setting DC power system, and guarantees that maximum dc output power is that current AC network environment can provide.Wherein the non-firm power of load equipment is a batteries.Set the parameter of maximum average anode current value, maximum average anode current value is associated with the nominal capacity of batteries, be meant that maximum average anode current value is the percentage of batteries nominal capacity.Maximum average anode current value is 15% of a batteries nominal capacity among the present invention.
In second step, when the three-phase alternating current power system restoration is powered, the output voltage of the rectification module by reducing DC power system is consistent with the current voltage of batteries, the interchange impulse current when effectively reducing the rectification module startup, thus improved the startup probability of each MDQ.When DC power system is subjected to line voltage reduction interference, when rectification module enters repeatedly starting state, downward modulation rectification module output voltage is consistent with the current voltage of batteries, interchange impulse current when effectively reducing the rectification module startup improves rectification module and restarts probability of successful.
In the 3rd step, by the every quantity that goes up the rectification module that starts operation mutually of interchange is equated, thereby the output current of the rectification module of three phase lines is equated, thereby make the threephase load of three-phase alternating current electrical network reach balance, the current in middle wire of three-phase four-wire system is close to zero, thereby reduce the adverse effect of the center line input resistance of three-phase four-wire system AC network, further improved the startup probability of each rectification module.
In the 4th step, maximum average anode current value parameter according to DC power system in the described first step, adjust every operation quantity that goes up rectification module mutually in the three-phase alternating current electrical network, to improve the efficient of rectification module, other rectification module enters standby mode, make every rectification module of going up mutually operate in the high energy efficiency district, improved the efficient of DC power system, reduced alternating current.
In the 5th step, be constant by every dc output power of going up mutually, guaranteed that the interchange input current of every phase is constant, thereby made DC power system stable operation.
In sum, the present invention adapts to the DC power system control method of three-phase alternating current electrical network power output deficiency.Can reliable startup and stable operation when three-phase alternating current electrical network power output is not enough.
Embodiment
A kind of DC power system control method that adapts to three-phase alternating current electrical network power output deficiency may further comprise the steps:
The first step by the software parameter setting module of DC power system monitoring unit, is set the maximum average anode current value parameter of described DC power system; Then corresponding maximum dc output power is the float charge voltage that described DC power supply output maximum current value parameter multiply by described batteries; In this step, the software parameter setting module of monitoring unit is mainly used in and sets maximum average anode current value, and guarantees that current AC network environment can provide this maximum dc output power.
Second step, when being subjected to line voltage, three-phase alternating current power system restoration power supply or DC power system disturb when reducing voltage, the output voltage of controlling all rectification modules is the current voltage of batteries, and adjust the maximum output current of described rectification module, the interchange impulse current when starting to reduce rectification module; In this step, after three-phase alternating current restores electricity, consistent by the output voltage that reduces each rectification module with the current voltage of batteries, effectively reduce the interchange impulse current of rectification module when starting, thereby improved the startup probability of each rectification module.When DC power system is subjected to line voltage reduction interference, when rectification module enters repeatedly starting state, downward modulation rectification module output voltage is consistent with the current voltage of batteries, interchange impulse current when effectively reducing the rectification module startup improves rectification module and restarts probability of successful.
The 3rd step equated every quantity that goes up the rectification module of operation mutually of three-phase alternating current electrical network, and adjusts its maximum output current, to guarantee the threephase load balance of three-phase alternating current electrical network, made DC power system can start operation; In this step, by every quantity that goes up the rectification module that starts operation is mutually equated, thereby the output current of the rectification module of three phase lines is equated, and then make the threephase load of three-phase alternating current electrical network reach balance, the current in middle wire of three-phase four-wire system is close to zero, thereby reduce the adverse effect of the middle line resistance of three-phase four-wire system AC network, further improved the startup probability of rectification module.
The 4th step, in described the 3rd step three-phase alternating current electrical network every mutually under the rectification module quantity of the operation situation about equating, maximum average anode current value parameter according to DC power system in the described first step, adjust every operation quantity that goes up rectification module mutually in the three-phase alternating current electrical network, to improve the efficient of rectification module, DC power system can reliably be started; In this step, the method for adjustment of the operation quantity of its rectification module is as follows: the power output of every each rectification module that upward moves mutually in the three-phase alternating current electrical network is moved between 40% to 80%.Since rectification module output characteristic decision, the power output of each rectification module is 40% between 80% the time, conversion efficiency is the highest, its caloric value is less, corresponding thermal losses is also little, then adopts the delivery efficiency of two rectification modules to improve, and makes a rectification module operate in the high energy efficiency district, thereby improved the efficient of DC power system, and then DC power system can reliably be started; For example, every when go up using a rectification module operation mutually, when the power output of this rectification module reaches 80% when above, its caloric value will become greatly, the thermal losses increase, and its delivery efficiency will descend; At this moment, if during with two rectification modules operations of every last mutually use, then each rectification module power output is 40%, make the caloric value of each rectification module little, thermal losses is little, whole delivery efficiency rises, thereby has improved the efficient of DC power system, and then DC power system can reliably be started.
The 5th step; after waiting for that DC power system reliably starts in described the 4th step; in the charging process of described batteries, improve the output voltage of described each rectification module gradually; reduce simultaneously the output current of rectification module gradually; keep power output constant, with the stable operation of protection DC power system.In this step, be by keeping dc output power constant, make DC power system stable operation.
Wherein, the maximum output current of described rectification module is the described maximum average anode current nominal capacity with described batteries on duty, again divided by the quantity of running status rectification module.Be the quantity of the nominal capacity ÷ running status rectification module of maximum average anode current value * batteries.
Wherein, the non-firm power of load equipment is a batteries; The maximum average anode current value parameter of DC power system and the nominal capacity of batteries are associated.Be meant that maximum average anode current value is the percentage of batteries nominal capacity.Maximum average anode current value is 15% of a batteries nominal capacity among the present invention.The setting that is associated is the stand-by power supply time for proof load equipment.
The specifications parameter of above-described all rectification modules is identical.
The charging voltage of batteries is divided into even charging voltage and float charge voltage.The maximum charging voltage that reaches at last during the batteries makeup energy is an even charging voltage, and the charging voltage of keeping after batteries is full of is a float charge voltage.
In sum, the DC power system control method of the present invention's adaptation.Can reliable startup and stable operation when three-phase alternating current electrical network power output is not enough.
Claims (3)
1. a DC power system control method that adapts to three-phase alternating current electrical network power output deficiency is characterized in that, may further comprise the steps:
The first step by the software parameter setting module of DC power system monitoring unit, is set the maximum average anode current value parameter of described DC power system;
Second step, when being subjected to line voltage, three-phase alternating current power system restoration power supply or DC power system disturb when reducing voltage, the output voltage of controlling all rectification modules is the current voltage of batteries, and adjust the maximum output current of described rectification module, the interchange impulse current when starting to reduce rectification module;
The 3rd step equated every quantity that goes up the rectification module of operation mutually of three-phase alternating current electrical network, and adjusts its maximum output current, to guarantee the threephase load balance of three-phase alternating current electrical network, made DC power system can start operation;
The 4th step, in described the 3rd step three-phase alternating current electrical network every mutually under the rectification module quantity of the operation situation about equating, maximum average anode current value parameter according to DC power system in the described first step, adjust every operation quantity that goes up rectification module mutually in the three-phase alternating current electrical network, to improve the efficient of rectification module, DC power system can reliably be started;
The 5th step; after waiting for that DC power system reliably starts in described the 4th step; in the charging process of described batteries, improve the output voltage of each described rectification module gradually; reduce simultaneously the output current of rectification module gradually; keep power output constant, with the stable operation of protection DC power system.
2. the DC power system control method of adaptation three-phase alternating current electrical network power output deficiency according to claim 1, it is characterized in that, the maximum output current of described rectification module, for the maximum average anode current value parameter of described DC power system multiply by the nominal capacity of described batteries, again divided by the quantity of the rectification module of current operation.
3. the DC power system control method of adaptation three-phase alternating current electrical network power output deficiency according to claim 1 is characterized in that the maximum average anode current value parameter of described DC power system and the nominal capacity of batteries are associated.
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| CN 201110209426 CN102255522B (en) | 2011-07-25 | 2011-07-25 | DC (direct current) power supply system control method adapted to deficient output power of three-phase AC (alternating current) power grid |
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| CN 201110209426 CN102255522B (en) | 2011-07-25 | 2011-07-25 | DC (direct current) power supply system control method adapted to deficient output power of three-phase AC (alternating current) power grid |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101847890A (en) * | 2010-05-28 | 2010-09-29 | 中达电通股份有限公司 | Control method for enhancing adaptability of communication power supply to single-phase alternating-current power grid |
| CN101888098A (en) * | 2009-05-15 | 2010-11-17 | 中达电通股份有限公司 | Power supply method of communication equipment with high reliability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003052132A (en) * | 2001-08-03 | 2003-02-21 | Sumitomo Electric Ind Ltd | Operation method for power supply system |
| JP2009195079A (en) * | 2008-02-18 | 2009-08-27 | Nippon Telegr & Teleph Corp <Ntt> | Dc power supply system and controlling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888098A (en) * | 2009-05-15 | 2010-11-17 | 中达电通股份有限公司 | Power supply method of communication equipment with high reliability |
| CN101847890A (en) * | 2010-05-28 | 2010-09-29 | 中达电通股份有限公司 | Control method for enhancing adaptability of communication power supply to single-phase alternating-current power grid |
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| JP特开2003-52132A 2003.02.21 |
| JP特开2009-195079A 2009.08.27 |
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