CN103401253B - SVG power cell circuit, chain type SVG power cell circuit and static state voltage equipoise method - Google Patents
SVG power cell circuit, chain type SVG power cell circuit and static state voltage equipoise method Download PDFInfo
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- CN103401253B CN103401253B CN201310354152.7A CN201310354152A CN103401253B CN 103401253 B CN103401253 B CN 103401253B CN 201310354152 A CN201310354152 A CN 201310354152A CN 103401253 B CN103401253 B CN 103401253B
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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
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Abstract
The invention discloses a kind of SVG power cell circuit, this SVG power cell circuit comprises: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, described control board controls the turn-on and turn-off of described discharge power switch S, realize busbar voltage electric discharge, its discharge circuit discharge power is constant, reaches the requirement of electric discharge controllability.In addition, the invention also discloses a kind of chain type SVG power cell circuit and static state voltage equipoise method, by detecting each cell voltage value, calculate bus discharge voltage upper lower limit value, and in time by effective operating power unit bus value and discharge voltage upper lower limit value judged to control whether to discharge, by adjusting magnitude of voltage, ensure that power cell can normally work in the standby state, and electric voltage equalization between unit.
Description
Technical field
The present invention relates to electric and electronic technical field, in particular, relate to a kind of SVG power cell circuit, chain type SVG power cell circuit and static state voltage equipoise method.
Background technology
Along with the development of power electronic technology, in power electronics industry, traditional dynamic passive compensation (SVC) device gradually by static reacance generator SVG in reactive power compensation field replace, due to the restriction by electric power electronic switching device, parallel connection type SVG is usually used in the reactive power compensation occasion of low-voltage power supply system, for in, high-voltage large-capacity reactive power compensation occasion, in prior art, main flow SVG main circuit adopts the chain structure based on H-bridge unit to form, its degree of modularity is high, control convenient and safeguard simple, Fig. 1 and Fig. 2 is respectively the main wiring diagram of conventional star and triangular structure chain type SVG access electrical network, star is not identical with triangle Main Wire Connection Scheme, but be the use of identical H bridge power unit.
Refer to accompanying drawing 3, for conventional chain type SVG power cell electric topology structural representation, it comprises the H-bridge inverter circuit be made up of switching tube, the power Support Capacitor Cs being parallel to H-bridge inverter circuit two ends is respectively in parallel with H-bridge inverter circuit with grading resistor Rs, high-pressure side DC/DC circuit, the control board be connected with DC/DC circuit low-pressure side and discharge circuit, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, it is parallel to the high-pressure side of DC/DC circuit, for carrying out discharging action when unit busbar voltage is too high.Wherein grading resistor Rs is for making the phase voltage of each power cell of homophase in the same size, to realize all pressing; Described power Support Capacitor C
sfor supporting DC bus-bar voltage, ensure that bus voltage value fluctuates in allowed limits; Described DC/DC circuit is used for being the voltage being applicable to power for control board by the busbar voltage step-down at H-bridge inverter circuit two ends, and described control board is for controlling the shutoff of discharge power switch S in the shutoff of H-bridge inverter circuit breaker in middle pipe and discharge circuit.When unit busbar voltage is increased beyond restriction, the discharge power switch S in discharge circuit is closed carries out discharging action by discharge resistance R, stablizes the busbar voltage between each unit.Because the discharge circuit of this discharge mode is in the high-pressure side of DC/DC circuit, it is higher that discharge resistance R bears voltage, and discharge power because of busbar voltage uncertain and uncertain, cause discharge process wayward.
Therefore, discharge power uncontrollable shortcoming high for above-mentioned busbar voltage discharge circuit electric pressure is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
In view of this, the invention provides a kind of SVG power cell circuit, chain type SVG power cell circuit and static state voltage equipoise method, to overcome in prior art because busbar voltage discharging current electric pressure is high, the uncontrollable power cell in the standby state that causes of discharge power cannot normally work, and the unbalanced problem of voltage between unit.
For achieving the above object, the invention provides following technical scheme:
A kind of SVG power cell circuit, comprise: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, and described control board controls the turn-on and turn-off of described discharge power switch S.
The invention also discloses a kind of chain type SVG power cell circuit, comprise SVG power cell circuit described in n the claims 1, wherein adjacent two described SVG power cell circuit cross-overs connect and crossfeed, n be greater than 1 even number.
Wherein, every two described SVG power cell circuit cross-overs are powered, and wherein, the low-pressure side of described DC/DC circuit is in parallel.
On above-mentioned disclosed basis, the invention also discloses a kind of chain type SVG power cell static state voltage equipoise method, chain type SVG often takes identical control mode mutually, and this control method comprises:
S1, obtain all pressures value U of the effective power cell busbar voltage of work of a wherein phase A
mean;
S2, the bus minimum voltage U normally worked according to described power cell
min, ceiling voltage U
maxwith described all pressures value U
mean, calculate the higher limit U of described busbar voltage electric discharge
up-limitwith lower limit U
down-limit;
S3, judge the busbar voltage of described effective operating power unit whether be greater than described busbar voltage electric discharge higher limit U
up-limit, determine whether to perform discharging action;
S4, be greater than described higher limit U when described busbar voltage
up-limittime, described control board granting electric discharge order, closed discharge switch performs discharging action;
S5, judge the busbar voltage of described effective operating power unit whether be less than described busbar voltage electric discharge lower limit U
down-limit, determine whether to stop discharging action;
S6, be less than described lower limit U when described busbar voltage
down-limittime, described control board granting stops electric discharge order, opens discharge switch and stops electric discharge.
Wherein, described step S1 comprises:
S11, gather the busbar voltage of this mutually all n power cell, U
1, U
2, U
3... U
m... U
n;
S12, calculate A the effectively operating power unit busbar voltage sum U of this phase
all=U
1+ U
2+ U
3+ ... + U
m+ ... U
n;
S13, when this phase power cell all normally works, described effective operating power unit A=n, when this phase power cell is bypassed, described effective operating power unit A=n-1;
All pressures value of the static busbar voltage of S14, each power cell is U
mean=U
all/ A.
Wherein, the step calculating the higher limit of described busbar voltage electric discharge is:
S21, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, do not having in Pressure and Control situation, the busbar voltage of m power cell will constantly decline, and its falling-threshold value is bus minimum voltage U
min, the maximum drop-out value of this power cell busbar voltage is Δ U
down1=U
mean-U
min;
S22, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell declines
down1to all assign to all the other n-2 power cell, therefore the rising value of the relatively equal pressure value of all the other n-2 power cell is Δ U
up1=Δ U
down1/ (n-2);
S23, by described all pressures value U
meanwith described rising value Δ U
up1the higher limit obtaining the electric discharge of described busbar voltage is U
up_limit=U
mean+ Δ U
up1.
Wherein, the step calculating the lower limit of described busbar voltage electric discharge is:
S211, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, all the other n-2 power cell is because busbar voltage all reaches electric discharge higher limit U
up-limitduring electric discharge, its unit busbar voltage starts to decline, and m power cell busbar voltage starts to rise, and its rising limiting value is that busbar voltage crosses pressure point U
max, the maximum rising value of this power cell busbar voltage is Δ U
up2=U
max-U
mean;
S212, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell rises
up2to all assign to all the other n-2 power cell, therefore the drop-out value of the relatively equal pressure value of all the other n-2 power cell is Δ U
down2=Δ U
up2/ (n-2);
S213, by described all pressures value U
meanwith described drop-out value Δ U
down2the lower limit obtaining the electric discharge of described busbar voltage is U
down_limit=U
mean-Δ U
down2.
Preferably, when this mutually all power cell all normally works, described step S2 comprises:
The higher limit U of rated output unit busbar voltage electric discharge
up_limit=U
mean+ X, described 0<X≤10;
The lower limit calculating busbar voltage electric discharge is U
down_limit=U
mean-Y, described 0<Y≤10.
Wherein, described X is identical with the value of described Y.
Wherein, described X is 1,5 or 10.
Known via above-mentioned technical scheme, compared with prior art, the invention discloses a kind of SVG power cell circuit, this SVG power cell circuit comprises: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, described control board controls the turn-on and turn-off of described discharge power switch S, realize busbar voltage electric discharge, its discharge circuit discharge power is constant, reach the requirement of electric discharge controllability.In addition, the invention also discloses a kind of method of chain type SVG power cell circuit and static state voltage equipoise, by detecting each cell voltage value, calculate bus discharge voltage upper lower limit value, and in time by effective operating power unit bus value and discharge voltage upper lower limit value judged to control whether to discharge, by adjusting magnitude of voltage, ensure that power cell can normally work in the standby state, and electric voltage equalization between unit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the main wiring diagram that conventional star structure chain type SVG accesses electrical network;
Fig. 2 is the main wiring diagram that conventional triangular structure chain type SVG accesses electrical network;
Fig. 3 is conventional chain type SVG power cell electric topology structural representation;
Fig. 4 is a kind of SVG power cell electrical block diagram disclosed in the embodiment of the present invention;
The flow chart of Fig. 5 a kind of chain type SVG power cell static state voltage equipoise method disclosed in the embodiment of the present invention;
Fig. 6 is chain type SVG power cell crossfeed structural representation disclosed in the embodiment of the present invention;
Power cell electric power-feeding structure schematic diagram when Fig. 7 chain type SVG disclosed in the embodiment of the present invention works in bypass condition.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention discloses a kind of SVG power cell circuit, this SVG power cell circuit comprises: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, described control board controls the turn-on and turn-off of described discharge power switch S, realize busbar voltage electric discharge, its discharge circuit discharge power is constant, reaches the requirement of electric discharge controllability.In addition, the invention also discloses a kind of chain type SVG power cell circuit and method for equalizing voltage, by detecting each cell voltage value, calculate bus discharge voltage upper lower limit value, and in time by effective operating power unit bus value and discharge voltage upper lower limit value judged to control whether to discharge, by adjusting magnitude of voltage, ensure that power cell can normally work in the standby state, and electric voltage equalization between unit.
Refer to accompanying drawing 4, a kind of SVG power cell electrical block diagram disclosed in the embodiment of the present invention.The embodiment of the invention discloses a kind of SVG power cell circuit, comprise: the H-bridge inverter circuit 1 of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit 2, discharge circuit 3 and control board 4, discharge circuit 3 comprises discharge power switch S and the discharge resistance R of series connection, discharge circuit 3 is parallel to the low-pressure side of DC/DC circuit 2, the turn-on and turn-off of control board 4 controlled discharge power switch S.
SVG power cell circuit disclosed in the invention described above embodiment, can realize busbar voltage electric discharge, the pressure drop that discharge circuit bears obviously reduces, and its discharge circuit discharge power is constant, reaches the requirement of electric discharge controllability.
On the basis of above-mentioned disclosed a kind of SVG power cell circuit, the invention also discloses a kind of chain type SVG power cell circuit, this chain type SVG power cell circuit comprises n above-mentioned SVG power cell circuit, wherein adjacent two SVG power cell circuit cross-overs connect and crossfeed, n be greater than 1 even number.
Above-mentioned every two SVG power cell circuit cross-overs are powered, and wherein, the low-pressure side of DC/DC circuit is in parallel.As shown in Figure 6, chain type SVG power cell crossfeed structural representation disclosed in the embodiment of the present invention.
A kind of SVG power cell circuit disclosed by the invention and chain type SVG power cell circuit, add discharge circuit by power supply low-pressure side, and realize busbar voltage electric discharge, its discharge circuit discharge power is constant, reaches the requirement of electric discharge controllability.
Concrete, refer to accompanying drawing 6, chain type SVG power cell crossfeed structural representation disclosed in the embodiment of the present invention.Give crossfeed electrical connection circuit schematic diagram between a kind of unit in Fig. 6, the control board be applicable under unit bypass state is powered.The DC bus-bar voltage of each power cell is as shown in the figure that control board is powered respectively by the DC/DC circuit in each unit, two simultaneously adjacent power cell interconnections, when one of them power cell can not be powered for its control board, another power cell cross-coupled with it is powered for its control board.Particularly, described power cell A
mwith power cell A
m+1the low-pressure side of DC/DC circuit parallel with one another.
On the basis of embodiment disclosed in the invention described above, refer to accompanying drawing 5, a kind of flow chart of chain type SVG power cell static state voltage equipoise method disclosed in the embodiment of the present invention.The embodiment of the invention also discloses a kind of chain type SVG power cell static state voltage equipoise method, often take identical control mode mutually, these control method concrete steps comprise:
Step S1, obtain all pressures value U of the effective power cell busbar voltage of work of a wherein phase A
mean;
Suppose often to be made up of n power cell, under bypass condition, unit phase voltage has n-1 power cell mean allocation.Three alternate cell voltage value can independently control, and three-phase control mode is identical.
Concrete, step S1 comprises:
Step S11, gather this mutually all n power cell busbar voltage, U
1, U
2, U
3... U
m... U
n;
Step S12, calculate A the effectively operating power unit busbar voltage sum U of this phase
all=U
1+ U
2+ U
3+ ... + U
m+ ... U
n;
Step S13, when this phase power cell all normally works, described effective operating power unit A=n, when this phase power cell is bypassed, described effective operating power unit A=n-1;
All pressures value of the static busbar voltage of step S14, each power cell is U
mean=U
all/ A.
Step S2, the bus minimum voltage U normally worked according to power cell
min, ceiling voltage U
maxall pressure value U
mean, calculate the higher limit U of busbar voltage electric discharge
up-limitwith lower limit U
down-limit;
Wherein, the calculation procedure of the higher limit of above-mentioned busbar voltage electric discharge comprises:
Step S21, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, do not having in Pressure and Control situation, the busbar voltage of m power cell will constantly decline, and its falling-threshold value is bus minimum voltage U
min, the maximum drop-out value of this power cell busbar voltage is Δ U
down1=U
mean-U
min;
Step S22, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell declines
down1to all assign to all the other n-2 power cell, therefore the rising value of the relatively equal pressure value of all the other n-2 power cell is Δ U
up1=Δ U
down1/ (n-2);
Step S23, by equal pressure value U
meanwith rising value Δ U
up1the higher limit obtaining busbar voltage electric discharge is U
up_limit=U
mean+ Δ U
up1.
Wherein, the calculation procedure of the lower limit of above-mentioned busbar voltage electric discharge comprises:
Step S211, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, all the other n-2 power cell is because busbar voltage all reaches electric discharge higher limit U
up-limitduring electric discharge, its unit busbar voltage starts to decline, and m power cell busbar voltage starts to rise, and its voltage rise limiting value is that busbar voltage crosses pressure point U
max, the maximum rising value of this power cell busbar voltage is Δ U
up2=U
max-U
mean;
Step S212, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell rises
up2to all assign to all the other n-2 power cell, therefore the drop-out value of the relatively equal pressure value of all the other n-2 power cell is Δ U
down2=Δ U
up2/ (n-2);
Step S213, by equal pressure value U
meanwith drop-out value Δ U
down2the lower limit obtaining busbar voltage electric discharge is U
down_limit=U
mean-Δ U
down2.
Step S3, judge the busbar voltage of effective operating power unit whether be greater than busbar voltage electric discharge higher limit U
up-limit, determine whether to perform discharging action;
Step S4, be greater than higher limit U when busbar voltage
up-limittime, control board granting electric discharge order, closed discharge switch performs discharging action, when busbar voltage is less than higher limit, keeps original state;
Step S5, judge the busbar voltage of effective operating power unit whether be less than busbar voltage electric discharge lower limit U
down-limit, determine whether to stop discharging action;
Step S6, be less than lower limit U when busbar voltage
down-limittime, control board granting stops electric discharge order, opens discharge switch and stops electric discharge, when busbar voltage is greater than lower limit, keeps original state.
In addition, when the otherness of non-bypass state lower unit loss comparatively large and cause that between unit, direct voltage voltage unbalance factor is excessive time, above-mentioned busbar voltage upper lower limit value still can use.
Concrete, refer to accompanying drawing 6, chain type SVG power cell crossfeed structural representation disclosed in the embodiment of the present invention.Give crossfeed electrical connection schemes between a kind of unit in Fig. 6, the control board be applicable under unit non-bypass state is powered.Time under non-bypass state, between alternate unit, voltage keeps equal pressure condition by grading resistor.Power cell busbar voltage is powered to drived control plate by the Switching Power Supply of DC/DC circuit simultaneously, because each unit drives plate power consumption is roughly the same, therefore under non-bypass state, the consumption of gaining merit of the DC bus of each power cell is consistent substantially, and each unit d-c bus voltage value can be kept in balance state.
Concrete, refer to accompanying drawing 7, power cell electric power-feeding structure schematic diagram when chain type SVG works in bypass condition disclosed in the embodiment of the present invention.Time under bypass condition, after access high-tension electricity, power cell A
m+1because output by external bypass switch short circuit bypass or the inside short circuit that formed by brachium pontis 2 IGBT conductings on inner H bridge or 2 the IGBT conductings of lower brachium pontis and bypass time, power cell Support Capacitor cannot be absorbed with function by H-bridge circuit and maintain bus voltage value, this power cell power supply cannot work, by A under adjacent cells crossfeed scheme
mpower cell power supply is powered, and sees this phase n unit, wherein A altogether on the whole
mthe load of power cell DC side is two blocks of drived control plates, A
m+1power cell is bypassed, and all the other n-2 unit DC side loads are one block of drived control plate, in the unit be not bypassed, and A
mthe load of unit DC side is larger, and due to the characteristic of DC/DC circuit outlet side load constant power, its busbar voltage will decline gradually, finally because brownout cannot provide normal working voltage for DC/DC circuit, simultaneously because this mutually total direct voltage remains unchanged, all the other n-2 power cell voltages will increase gradually.As the above analysis, not by under outside voltage regulation way, busbar voltage when each power cell of SVG is static under bypass condition plays pendulum.Master control borad carries out control of discharge according to each power cell real-time voltage collected.
The method of chain type SVG power cell static state voltage equipoise disclosed by the invention, by detecting each cell voltage value, calculating discharge voltage upper lower limit value in real time, and in time magnitude of voltage being adjusted, ensure that power cell can normally work in the standby state, and electric voltage equalization between unit.
When normal work, will constantly reduce due to DC/DC circuit input side equivalent resistance with unit busbar voltage, finally cause power cell internal circuit cisco unity malfunction, therefore chain type SVG power cell circuit also needs all to press.
Concrete, when this phase n power cell all normally works, effective operating power unit A=n, now the calculation procedure of all pressures value of static busbar voltage is identical with above-mentioned steps S11 ~ S14.
Obtain the higher limit U of power cell busbar voltage electric discharge
up-limitwith lower limit U
down-limitstep be:
The higher limit U of rated output unit busbar voltage electric discharge
up_limit=U
mean+ X, described 0<X≤10;
The lower limit calculating busbar voltage electric discharge is U
down_limit=U
mean-Y, described 0<Y≤10.
Wherein, described X is identical with the value of described Y, and described X can be 1,5 or 10.
X described above, Y value design accordingly according to scheme, are not limited to span described above and numerical value.
In sum: the invention discloses a kind of SVG power cell circuit, this SVG power cell circuit comprises: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, it is characterized in that, described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, described control board controls the turn-on and turn-off of described discharge power switch S, realize busbar voltage electric discharge, its discharge circuit discharge power is constant, reach the requirement of electric discharge controllability.In addition, the invention also discloses a kind of chain type SVG power cell circuit and static state voltage equipoise method, by detecting each cell voltage value, calculate bus discharge voltage upper lower limit value, and in time by effective operating power unit bus value and discharge voltage upper lower limit value judged to control whether to discharge, by adjusting magnitude of voltage, ensure that power cell can normally work in the standby state, and electric voltage equalization between unit.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a SVG power cell circuit, comprise: the H-bridge inverter circuit of electrical connection, power Support Capacitor Cs, grading resistor Rs, DC/DC circuit, discharge circuit and control board, described discharge circuit comprises discharge power switch S and the discharge resistance R of series connection, it is characterized in that
Described power Support Capacitor Cs and grading resistor Rs is parallel to H-bridge inverter circuit two ends respectively;
Described DC/DC circuit high-pressure side and H-bridge inverter circuit are in parallel;
Described control board is connected with DC/DC circuit low-pressure side;
Described discharge circuit is parallel to the low-pressure side of described DC/DC circuit, and described control board controls the turn-on and turn-off of described discharge power switch S, realizes busbar voltage electric discharge.
2. a chain type SVG power cell circuit, is characterized in that, comprises SVG power cell circuit described in n the claims 1, and wherein adjacent two described SVG power cell circuit cross-overs connect and crossfeed, n be greater than 1 even number.
3. chain type SVG power cell circuit according to claim 2, is characterized in that, every two described SVG power cell circuit cross-overs are powered, and wherein, the low-pressure side of described DC/DC circuit is in parallel.
4. a chain type SVG power cell static state voltage equipoise method, be applied to SVG power cell circuit described in claim 2, it is characterized in that, chain type SVG often takes identical control mode mutually, and this control method comprises:
S1, obtain all pressures value U of the effective power cell busbar voltage of work of a wherein phase A
mean;
S2, the bus minimum voltage U normally worked according to described power cell
min, ceiling voltage U
maxwith described all pressures value U
mean, calculate the higher limit U of described busbar voltage electric discharge
up-limitwith lower limit U
down-limit;
S3, judge the busbar voltage of described effective operating power unit whether be greater than described busbar voltage electric discharge higher limit U
up-limit, determine whether to perform discharging action;
S4, be greater than described higher limit U when described busbar voltage
up-limittime, described control board granting electric discharge order, closed discharge switch performs discharging action;
S5, judge the busbar voltage of described effective operating power unit whether be less than described busbar voltage electric discharge lower limit U
down-limit, determine whether to stop discharging action;
S6, be less than described lower limit U when described busbar voltage
down-limittime, described control board granting stops electric discharge order, opens discharge switch and stops electric discharge.
5. chain type SVG power cell static state voltage equipoise method according to claim 4, it is characterized in that, described step S1 comprises:
S11, gather the busbar voltage of this mutually all n power cell, U
1, U
2, U
3... U
m... U
n;
S12, calculate A the effectively operating power unit busbar voltage sum U of this phase
all=U
1+ U
2+ U
3+ ... + U
m+ ... U
n;
S13, when this phase power cell all normally works, described effective operating power unit A=n, when this phase power cell is bypassed, described effective operating power unit A=n-1;
All pressures value of the static busbar voltage of S14, each power cell is U
mean=U
all/ A.
6. chain type SVG power cell static state voltage equipoise method according to claim 4, is characterized in that, the step calculating the higher limit of described busbar voltage electric discharge is:
S21, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, do not having in Pressure and Control situation, the busbar voltage of m power cell will constantly decline, and its falling-threshold value is bus minimum voltage U
min, the maximum drop-out value of this power cell busbar voltage is Δ U
down1=U
mean-U
min;
S22, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell declines
down1to all assign to all the other n-2 power cell, therefore the rising value of the relatively equal pressure value of all the other n-2 power cell is Δ U
up1=Δ U
down1/ (n-2);
S23, by described all pressures value U
meanwith described rising value Δ U
up1the higher limit obtaining the electric discharge of described busbar voltage is U
up_limit=U
mean+ Δ U
up1.
7. chain type SVG power cell static state voltage equipoise method according to claim 4, is characterized in that, the step calculating the lower limit of described busbar voltage electric discharge is:
S211, when m+1 power cell is bypassed, be that control board in m+1 power cell is powered by m power cell, all the other n-2 power cell is because busbar voltage all reaches electric discharge higher limit U
up-limitduring electric discharge, its unit busbar voltage starts to decline, and m power cell busbar voltage starts to rise, and its rising limiting value is that busbar voltage crosses pressure point U
max, the maximum rising value of this power cell busbar voltage is Δ U
up2=U
max-U
mean;
S212, to remain unchanged according to voltage between phases summation, the voltage Δ U that this power cell rises
up2to all assign to all the other n-2 power cell, therefore the drop-out value of the relatively equal pressure value of all the other n-2 power cell is Δ U
down2=Δ U
up2/ (n-2);
S213, by described all pressures value U
meanwith described drop-out value Δ U
down2the lower limit obtaining the electric discharge of described busbar voltage is U
down_limit=U
mean-Δ U
down2.
8. chain type SVG power cell static state voltage equipoise method according to claim 4, is characterized in that, when this mutually all power cell all normally works, described step S2 comprises:
The higher limit U of rated output unit busbar voltage electric discharge
up_limit=U
mean+ X, described 0<X≤10;
The lower limit calculating busbar voltage electric discharge is U
down_limit=U
mean-Y, described 0<Y≤10.
9. chain type SVG power cell static state voltage equipoise method according to claim 8, it is characterized in that, described X is identical with the value of described Y.
10. chain type SVG power cell static state voltage equipoise method according to claim 9, it is characterized in that, described X is 1,5 or 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310354152.7A CN103401253B (en) | 2013-08-14 | 2013-08-14 | SVG power cell circuit, chain type SVG power cell circuit and static state voltage equipoise method |
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| CN106374729A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage balance DC-side power supply of chain type high-voltage active filtering apparatus |
| CN106374730A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | Chain link voltage balancing device for three-phase chain high-voltage active power filter |
| CN106602853A (en) * | 2015-10-15 | 2017-04-26 | 伊顿公司 | Discharge device and discharge method for DC buses of uninterruptible power supply |
| CN105322788A (en) * | 2015-11-17 | 2016-02-10 | 西南交通大学 | Suspension chopper for magnetic-levitation train |
| CN112436724B (en) * | 2019-08-26 | 2022-05-17 | 南京南瑞继保电气有限公司 | Current conversion device and assembly thereof, reactive power compensation device, current converter and control method thereof |
| CN111800001A (en) * | 2020-04-28 | 2020-10-20 | 西安许继电力电子技术有限公司 | Voltage-sharing device and voltage-sharing method for bus capacitor on serial side of direct-current transformer |
| KR20240028876A (en) * | 2022-08-25 | 2024-03-05 | 엘지이노텍 주식회사 | Power Converting Apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856979A (en) * | 2010-05-26 | 2010-10-13 | 许继集团有限公司 | Electrified railway in-phase power supply device |
| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN202749820U (en) * | 2012-06-01 | 2013-02-20 | 中冶华天工程技术有限公司 | H-bridge cascaded SVG power unit circuit |
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| JP2009177865A (en) * | 2008-01-21 | 2009-08-06 | Sony Corp | Overvoltage protection circuit |
| CN103187776B (en) * | 2013-04-15 | 2015-10-21 | 南车株洲电力机车有限公司 | Voltage balance circuit of super-capacitor module |
-
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856979A (en) * | 2010-05-26 | 2010-10-13 | 许继集团有限公司 | Electrified railway in-phase power supply device |
| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN202749820U (en) * | 2012-06-01 | 2013-02-20 | 中冶华天工程技术有限公司 | H-bridge cascaded SVG power unit circuit |
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