CN103427474A - Uninterruptible power supply device control method, the uninterruptible power supply unit - Google Patents
Uninterruptible power supply device control method, the uninterruptible power supply unit Download PDFInfo
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Abstract
The present invention is the use of three UPS inverter circuit, even when the input current of the output current is small is good, but also the fluctuation of the neutral point potential. Uninterruptible power supply apparatus of the present invention, during the power is not supplied from the electric power system, in case of unbalanced neutral point, the rectifier operation is temporarily stopped and cut off from the power system and power is supplied from the battery to the inverter, so that the rectifier operation is started again.
Description
Technical field
The present invention relates to possess the UPS(uninterrupted power supply(ups) of three grades of translation circuits).
Background technology
Three grades of translation circuits are the current transformers that can export the direct voltage of three grades.Three grades of translation circuits possess respectively capacitor (side of the positive electrode capacitor and negative side capacitor) at upper arm and the underarm of direct current component.If the both end voltage of each capacitor is unequal, occur in output voltage problems such as comprising high frequency voltage, so control, each both end voltage is equated.
But the unequal state of each both end voltage, occur in the essential factors such as characteristic disorder due to operating principle or the switch element of three grades of translation circuits sometimes.Be referred to as the neutral point potential change.The neutral point potential change can suppress by controlling neutral point current.Neutral point current flows through when three grades of translation circuits are given and accepted electric power.
No matter following patent documentation 1 shows is in the situation that start or bringing back to life, and can suppress rightly the method for neutral point potential change.
The prior art document
Patent documentation 1: TOHKEMY 2006-191743 communique
Summary of the invention
In the technology of putting down in writing at above-mentioned patent documentation 1, think, if input current and output current diminish, the electric power that three grades of translation circuits are given and accepted also diminishes, so as a result of, neutral point current also diminishes, and the effect that suppresses the neutral point potential change is also step-down meanwhile.
For example, in the UPS that has adopted three grades of translation circuits, have to plant and be: the rectifier formed as three grades of translation circuits by connection and the direct current component of inverter, the alternating electromotive force that will supply with from power-supply system is transformed to disposable direct current, and then it is transformed to interchange.Such UPS supplies with while stopping from storage battery to the load supply capability at the electric power from power-supply system, if but load at this moment is light, and the electric power that three grades of translation circuits are given and accepted diminishes, and will betide above-mentioned identical problem.
The present invention completes in view of above-mentioned problem, and its purpose is, in the UPS that uses three grades of translation circuits, even, in the situation that input current and output current are little, also can suppress the neutral point potential change.
Uninterrupted power supply(ups) of the present invention, not from during the power-supply system supply capability, occurring in the unbalanced situation of neutral point, temporarily stop the action of rectifier, the system of cutting off the electricity supply, start power supply from storage battery to inverter, start the action of rectifier again.
According to uninterrupted power supply(ups) of the present invention, even, in the situation that input current and output current diminish, also can effectively suppress the neutral point potential change.
The accompanying drawing explanation
Fig. 1 illustrates the figure that the circuit of the UPS200 of execution mode 1 forms.
Fig. 2 is the circuit diagram of rectifier 202.
Fig. 3 is the block diagram that explanation control device 210 is controlled the action of rectifier 202.
Fig. 4 is the block diagram of the details of explanation pulse output determinant 516.
Fig. 5 is the block diagram of the details of explanation switching SW524.
Fig. 6 is the circuit diagram that another configuration example of rectifier 202 is shown.
Fig. 7 is the circuit diagram that another configuration example of rectifier 202 is shown.
Symbol description
100: power-supply system; The 200:UPS(uninterrupted power supply(ups)); 202: rectifier; 204: inverter; 206: load; 208: buck-boost chopper; 210: control device; 212: storage battery; 214: DC circuit; 220: the side of the positive electrode capacitor; 222: the negative side capacitor; 230,232: voltage sensor; 300,302,304: circuit breaker; 400: filter reactor; 402: filtering capacitor; 404u, 404v, 404w: current sensor
Embodiment
<execution mode 1: the device formation>
Fig. 1 illustrates the figure of circuit structure of the UPS200 of embodiments of the present invention 1.For the ease of record, the polyphase ac circuit is illustrated with the single line line graph.UPS200 possesses rectifier 202, inverter 204, control device 210, DC circuit 214.Other detailed construction of suitable explanation.Rectifier 202 sides of UPS200 are connected with power-supply system 100 with transformer 102 via circuit breaker 300 and input.Inverter 204 sides of UPS200 are connected with load 206 via circuit breaker 302.
In the normal situation of power-supply system 100, the electric power that load 206 consumes is supplied with from power-supply system 100.Rectifier 202 is by controlling rectifier current Icnv, control the magnitude of current of charging side of the positive electrode capacitor 220 and negative side capacitor 222, be certain by the voltage control between P-N, and then obtain the balance of voltage (negative side voltage) between voltage between P-M (side of the positive electrode voltage) and M-N.
Due to outage etc., from the electric power of power-supply system 100, to supply with in the situation of interrupting, the running (action of switch element) that stops rectifier 202 at control device 210 afterwards, is used and is accumulated in the electric power of storage battery 212 and to load 206 supply capabilities.Control device 210, after the electric power supply started from storage battery 212, make circuit breaker 300 open circuits.Circuit breaker 302, when checking UPS200, is used during by UPS200 and load 206 cut-out.
Fig. 2 is the circuit diagram of rectifier 202.The main circuit of rectifier 202 forms as the three-class power translation circuit.In Fig. 2, the semiconductor switch by the application reverse block-type is as closing S2 and S3, and formed the three-class power converting means, but also can adopt other structure.
Pulse signal Pc consists of " 0 " and " 1 " signal.In the situation that pulse signal Pc is 0, switch is off state, and electric current does not flow.In the situation that pulse signal Pc is 1, switch is on-state, current flowing.For pulse signal Pi, P3 too.By this switch motion, rectifier 202 can be according to the analog AC voltage of the direct voltage output pulse type of three grades.In the situation that being transformed to direct current power, alternating electromotive force implements conversion according to switch motion similarly.Thus, can carry out mutually power converter to AC and DC.
To ac output end of rectifier 202, configure that form by filter reactor 400 and filtering capacitor 402, as to make high-frequency current and high frequency voltage decay ac filter circuit.
Next, use Fig. 1 and Fig. 2 explanation for controlling distribution and the device of rectifier 202 and inverter 204.
The both end voltage Vdc_N of the both end voltage Vdc_P of side of the positive electrode capacitor 220 and negative side capacitor 222 is detected by suitable voltage sensor, and this testing result is to control device 210 inputs.
<execution mode 1: the principle of the change of inhibition neutral point current potential>
Use Fig. 2 that the principle of the neutral point potential change while suppressing outage is described.As an example, the switch element of supposing rectifier 202 is off state and direct voltage Vdc_P>Vdc_N entirely.
At this moment, if switch element S_1U and S_3V are connected, accumulate the ordinal shift by the M terminal of the V phase of the V phase → filter reactor 400 of the U phase → filtering capacitor 402 of the U phase → filtering capacitor 402 of the P terminal of side of the positive electrode capacitor 220 → DC circuit 214 → switch element S_1U → filter reactor 400 → switch element S_3V → DC circuit 214 → side of the positive electrode capacitor 220 in the electric charge of side of the positive electrode capacitor 220.In this process, because the connection resistance of the resistive component in circuit, switch element loses, the electric charge of side of the positive electrode capacitor 220 is consumed, and direct voltage Vdc_P reduces.Consequently can make the deviation of direct voltage Vdc_P and Vdc_N diminish.
In the situation that direct voltage Vdc_P<Vdc_N, if for example make switch element S_2W and S_4V connect, accumulate in the electric charge of negative side capacitor 222, by the ordinal shift of the N terminal of the V phase of the V phase → filter reactor 400 of the W phase → filtering capacitor 402 of the W phase → filtering capacitor 402 of the M terminal of negative side capacitor 222 → DC circuit 214 → switch element S_2W → filter reactor 400 → switch element S_4V → DC circuit 214 → negative side capacitor 222.In this process, because the connection resistance of the resistive component in circuit, switch element loses, the electric charge of negative side capacitor 222 is consumed, and direct voltage Vdc_N reduces.Consequently can make the deviation of direct voltage Vdc_P and Vdc_N diminish.
<execution mode 1: the control action of the change of inhibition neutral point current potential>
Fig. 3 is the block diagram that explanation control device 210 is controlled the action of rectifier 202.Control device 210, according to the state of power-supply system 100, the three-phase alternating voltage command value that 202 switchings are exported for rectifier.At first the normal situation of power-supply system 100 is described, next illustrates from the electric power of power-supply system 100 and supply with the situation of interrupting.
In addition, outage determinant 522 is used system voltage Vcnv to judge whether power-supply system 100 is off-position.Particularly, while only using the electric power of supplying with from power-supply system 100 not supply with enough electric power to load 206, be judged to be off-position.Result of determination SG1 is to switching SW524 output.
The output of DC voltage control arithmetic unit 504 is that voltage instruction value Vun, Vvn, Vwn are to pulse arithmetic unit PWM1(518) input.Pulse arithmetic unit PWM1(518) use the three-phase alternating voltage command value of inputting to pass through pulse width modulation computing pulse Pc1, and to switching SW524 output.
In the situation that power-supply system 100 outages, to subtracter 502 input both end voltage Vdc_P and Vdc_N.The output of subtracter 502 is to when outage voltage instruction value arithmetic device 512 and signed magnitude arithmetic(al) device ABS506 input.
Signed magnitude arithmetic(al) device ABS506 controls the absolute value of determinant 520 output input values to when outage.Control determinant 520 during outage, when power-supply system 100 outage, if input signal surpasses predetermined threshold,, to pulse output determinant 516 output SG2=1, if below threshold value, export SG2=0.
The principle of voltage instruction value arithmetic device 512 priority of use explanations during outage, three-phase alternating voltage command value Vun ', Vvn ', Vwn ' that computing diminishes the deviation of both end voltage Vdc_P and Vdc_N.To pulse arithmetic unit PWM2(514) export its result.
Pulse arithmetic unit PWM2(514) use the three-phase alternating voltage command value of inputting, by pulse width modulation computing pulse Pcc2, to 516 outputs of pulse output determinant.Pulse output determinant 516 determines whether pulse Pcc2 to switching SW524 output.
Fig. 4 is the block diagram of the details of explanation pulse output determinant 516.Pulse output determinant 516 is controlled the output signal SG2 of determinant 520 during according to outage, determines whether pulse arithmetic unit PWM2(514) output be that pulse Pcc2 is to switching SW514 output.In the situation that SG2=1 selects Pcc2, as Pc2, to switching SW524, export.In the situation that SG2=0 selects 0, using zero pulse as Pc2 to switching SW524 output.By the output zero pulse, can prevent the useless loss occurrence of accompanying with the switch motion of rectifier 202.
Fig. 5 is the block diagram of the details of explanation switching SW524.Switching SW524, be SG1 according to the output signal of outage determination module 522, selects some in Pc1 and Pc2, as pulse Pc, exported.
<execution mode 1: sum up>
As mentioned above, if supply with and interrupt from the electric power of power-supply system 100, the UPS200 of present embodiment 1 makes rectifier 202 actions, so that side of the positive electrode capacitor 220 or 222 electric discharges of negative side capacitor, and obtains the balance of neutral point current potential.Thus, even in the situation that the electric power that rectifier 202 is given and accepted is little, also can effectively control the neutral point current potential.
<execution mode 2>
Fig. 6 is the circuit diagram that another structure example of rectifier 202 is shown.In Fig. 6, to the in series anti-semiconductor switch that connects of the M terminal of current circuit 214.Even replace semiconductor switch illustrated in fig. 2, as to use reverse block-type, and adopt the structure shown in Fig. 6, effect of the present invention is also identical.
Fig. 7 is the circuit diagram that another structure example of rectifier 202 is shown.Even replace at semiconductor switch illustrated in fig. 2, that use reverse block-type, and adopt the structure shown in Fig. 7, effect of the present invention is also identical.
The invention is not restricted to above-mentioned execution mode, and comprise various variation.Above-mentioned execution mode is the execution mode described in detail for ease of describing with understanding the present invention, and is not necessarily limited to possess the example of the entire infrastructure illustrated.
Above-mentioned each structure, control, handling part, processing means etc. can be by such as part or all that is realized them by hardware such as designed with integrated circuit.In addition, the program that realizes each control also can be explained by processor, be carried out to each above-mentioned structure, control etc., and realized by software.The information that realizes each program of controlling, form, file etc. can be stored in memory, hard disk, SSD(Solid State Drive) etc. the recording mediums such as tape deck, IC-card, SD card, DVD.
Claims (5)
1. a uninterrupted power supply(ups), is characterized in that,
Possess:
Rectifier, be transformed to alternating electromotive force the direct current power of predetermined voltage;
Circuit breaker, connect described rectifier and power-supply system;
Inverter, be transformed to alternating electromotive force by the described direct current power of described rectifier output;
Filter circuit, export ac output end of described rectifier to power-supply system;
DC circuit, be connected between described rectifier and described inverter;
Storage battery, be connected with described DC circuit; And
Control device, control the action of described rectifier,
Described rectifier has: switch element, as can selectivity output cathode side current potential, three grades of converters of neutral point current potential, these three current potentials of negative side current potential and forming,
Described control device is not from during described power-supply system supply capability, while difference between described side of the positive electrode current potential and described neutral point current potential and the unbalanced situation of difference between described negative side current potential and described neutral point current potential being detected, making described circuit breaker opens in the action that temporarily stops described switch element and starting power supply from described storage battery to described inverter, again start the action of described switch element.
2. uninterrupted power supply(ups) according to claim 1, is characterized in that,
Described DC circuit possesses:
The side of the positive electrode capacitor, apply the voltage based on described side of the positive electrode current potential and described neutral point current potential; And
The negative side capacitor, apply the voltage based on described negative side current potential and described neutral point current potential,
Described control device starts again by the action that makes described switch element, the charge discharge that described side of the positive electrode capacitor or described negative side capacitor are accumulated, thus make difference between described side of the positive electrode current potential and described neutral point current potential and the mutual balance of difference between described negative side current potential and described neutral point current potential.
3. uninterrupted power supply(ups) according to claim 2, is characterized in that,
When described control device starts again in the action that makes described switch element, by so that the mode that discharging current flows through from described side of the positive electrode capacitor or described negative side capacitor to the path of described filter circuit makes described switch element action, thus the charge discharge that described side of the positive electrode capacitor or described negative side capacitor are accumulated.
4. uninterrupted power supply(ups) according to claim 2, is characterized in that,
Described uninterrupted power supply(ups) possesses:
Voltage detector, detect the both end voltage of described side of the positive electrode capacitor and the both end voltage of described negative side capacitor,
Described control device is by making the large capacitor discharge of both end voltage in described side of the positive electrode capacitor and described negative side capacitor, thus make difference between described side of the positive electrode current potential and described neutral point current potential, and described negative side current potential and described neutral point current potential between the mutual balance of difference.
5. the control method of a uninterrupted power supply(ups), be the method for controlling the action of uninterrupted power supply(ups), it is characterized in that,
Described uninterrupted power supply(ups) possesses:
Rectifier, have switch element, as can selectivity output cathode side current potential, three grades of converters of neutral point current potential, these three current potentials of negative side current potential and forming, alternating electromotive force is transformed to the direct current power of predetermined voltage;
Circuit breaker, connect described rectifier and power-supply system;
Inverter, be transformed to alternating electromotive force by the described direct current power of described rectifier output;
Filter circuit, export ac output end of described rectifier to power-supply system;
DC circuit, be connected between described rectifier and described inverter;
Storage battery, be connected with described DC circuit; And
Control device, control the action of described rectifier,
Described method has following steps:
Not from during described power-supply system supply capability, detect difference between described side of the positive electrode current potential and described neutral point current potential and the unbalanced step of difference between described negative side current potential and described neutral point current potential; And
Making described circuit breaker opens in the action that temporarily stops described switch element and starting power supply from described storage battery to described inverter, the step that the action of described switch element is started again.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-118284 | 2012-05-24 | ||
| JP2012118284A JP5947109B2 (en) | 2012-05-24 | 2012-05-24 | Uninterruptible power supply, control method of uninterruptible power supply |
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| CN103427474A true CN103427474A (en) | 2013-12-04 |
| CN103427474B CN103427474B (en) | 2016-04-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103337962A (en) * | 2013-06-20 | 2013-10-02 | 南京工程学院 | Offshore wind plant DC converge used three-level converter and control method thereof |
| WO2017024641A1 (en) * | 2015-08-13 | 2017-02-16 | 厦门科华恒盛股份有限公司 | Three-phase rectifier boost circuit and control method therefor, and uninterruptible power supply |
| CN109792159A (en) * | 2016-09-30 | 2019-05-21 | 东芝三菱电机产业***株式会社 | Uninterrupted power supply |
| CN113228492A (en) * | 2019-07-23 | 2021-08-06 | 东芝三菱电机产业***株式会社 | Composite power conversion system |
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| JP5664819B1 (en) * | 2014-09-16 | 2015-02-04 | 富士電機株式会社 | Uninterruptible power supply controller |
| JP6003970B2 (en) * | 2014-12-02 | 2016-10-05 | 富士電機株式会社 | Uninterruptible power supply controller |
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| US11228258B2 (en) * | 2018-11-20 | 2022-01-18 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Uninterruptible power supply apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337962A (en) * | 2013-06-20 | 2013-10-02 | 南京工程学院 | Offshore wind plant DC converge used three-level converter and control method thereof |
| CN103337962B (en) * | 2013-06-20 | 2016-06-01 | 南京工程学院 | Marine wind electric field direct current convergence three-level converter and control method thereof |
| WO2017024641A1 (en) * | 2015-08-13 | 2017-02-16 | 厦门科华恒盛股份有限公司 | Three-phase rectifier boost circuit and control method therefor, and uninterruptible power supply |
| US10284108B2 (en) | 2015-08-13 | 2019-05-07 | Xiamen Kehua Hengsheng Co., Ltd. | Three-phase boost rectifier circuit and control method thereof, and an uninterrupted power supply |
| CN109792159A (en) * | 2016-09-30 | 2019-05-21 | 东芝三菱电机产业***株式会社 | Uninterrupted power supply |
| CN113228492A (en) * | 2019-07-23 | 2021-08-06 | 东芝三菱电机产业***株式会社 | Composite power conversion system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103427474B (en) | 2016-04-20 |
| JP2013247724A (en) | 2013-12-09 |
| JP5947109B2 (en) | 2016-07-06 |
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Effective date of registration: 20200306 Address after: Tokyo, Japan Patentee after: Hitachi Industrial Machinery Co., Ltd Address before: Tokyo, Japan Patentee before: Hitachi, Ltd. |