CN105958506B - A kind of metro traction power system and control method based on power circulation type - Google Patents
A kind of metro traction power system and control method based on power circulation type Download PDFInfo
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- CN105958506B CN105958506B CN201610363997.6A CN201610363997A CN105958506B CN 105958506 B CN105958506 B CN 105958506B CN 201610363997 A CN201610363997 A CN 201610363997A CN 105958506 B CN105958506 B CN 105958506B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a kind of metro traction power systems based on power circulation type, circulate device including power, it includes control unit that power, which circulates device, two single-phase transformers, two full-bridge circuits and an intermediate capacitance, two full-bridge circuits form back to back structure form and share intermediate capacitance, the ac output end of two full-bridge circuits is connected with the secondary side of two single-phase transformers respectively, one end of two single-phase transformer primary sides is connected with the two-phase in three phase network respectively, the other end of two single-phase transformer primary sides is then connected with the third phase of three phase network, control unit is connected with full-bridge circuit, for controlling the output electric current of full-bridge circuit to realize normal power supply, the power-balance of energy feedback and three phase network.Power supply system of the invention has many advantages, such as that structure is simple, full-featured.Control method of the invention, then by adjusting the output electric current of full-bridge circuit with realize power circulation device different working modes, have many advantages, such as it is easy to operate, be easily achieved.
Description
Technical field
The invention mainly relates to technical field of rail traffic, refer in particular to a kind of subway traction power supply system based on power circulation type
System and control method.
Background technique
It needs to provide Traction networks DC voltage in subway power supply, needs feedback locomotive brake energy, need to solve three-phase electricity
The power quality problems such as the low, harmonic wave of net power factor.Subway power supply is realized using diode rectification device at present, structure is simple,
Cost is relatively low, but DC voltage is uncontrollable, and fluctuation range is big, and energy can only one-way flow, train regenerative braking it is more
Residual current amount can not be fed back to AC network, cause the waste of energy.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind of structure is simple, the full-featured metro traction power system based on power circulation type, and accordingly provide it is a kind of it is easy to operate,
The control method for the metro traction power system based on power circulation type being easily achieved.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of metro traction power system based on power circulation type, which is characterized in that circulate device including power, it is described
It includes control unit, two single-phase transformers, two full-bridge circuits and an intermediate capacitance, two full-bridge electricity that power, which circulates device,
Road formed back to back structure form and share intermediate capacitance, the ac output end of two full-bridge circuits respectively with two single-phase transformations
The secondary side of device is connected, and the both ends of the intermediate capacitance are connected with subway traction power supply net, one end of two single-phase transformer primary sides
Be connected respectively with the two-phase in three phase network, the other end of two single-phase transformer primary sides then with the third phase phase of three phase network
Even, control unit is connected with the full-bridge circuit, for controlling the output electric current of the full-bridge circuit to realize normal power supply, energy
Measure the power-balance of feedback and three phase network.
Preferably, two full-bridge circuits are the H-bridge circuit being made of four IGBT modules.
Preferably, it is provided with switch between the power circulation device and subway traction power supply net, is closed the switch when described
When, the power circulation device switches between four kinds of operating modes, and four kinds of operating modes include normal power supply mode, energy
Amount feedback mode, normal power supply add governance model and energy feedback to add governance model；When the switch disconnects, the function
Rate circulation device is then in governance model, and wherein governance model includes the one of idle fundamental positive sequence, fundamental wave negative sequence and harmonic wave control
Kind or multiple combinations.
The invention also discloses a kind of control method of metro traction power system based on power circulation type, feature exists
In, comprising the following steps:
(1) three phase network target compensation electric current I is obtainedC1 *And IC2 *, while by UdcWith Udc_refMake the difference to obtain Δ UdcIt is processed into
Fundamental positive sequence active component I2f1pAnd I2f1p* α, as electric current and power demands electric current or energy feedback electric current needed for being lost, wherein
UdcFor the voltage at intermediate capacitance both ends, Udc_refFor target maintenance voltage；The then work order electric current I of two full-bridge circuitsC1、IC2
By target compensation electric current IC1 *、IC2 *With fundamental positive sequence active component I2f1p、I2f1p* α is accordingly formed by stacking, such as following formula:
(2) by target compensation electric current IC1 *And IC2 *It compensates into three phase network, at this time three phase network electric current IA、IB、ICIt is equal to
Threephase load electric current Ia、Ib、IbWith compensation the sum of electric current, such as following formula:
Wherein
In formula (3), If1p、If1p*α2、If1p* α is A, B, C phase fundamental positive sequence active component；If1q、If1q*α2、If1q* α be A,
B, C phase fundamental positive sequence reactive component；If2、If2*α、If2*α2For A, B, C phase fundamental wave negative sequence component；Iah、Ibh、IchRespectively three-phase
Load current harmonic component, α are complex operator, α=ej120°, wherein 1+ α+α2=0；
By full-bridge circuit to three phase network target compensation electric current IC1 *And IC2 *It is adjusted, to realize normal power supply, energy
It carries out carrying out electric energy improvement when electric energy improvement, energy feedback when measuring feedback, normal power supply or independent electric energy is administered；It is wherein electric
Idle, fundamental wave negative sequence and harmonic wave control one or more combinations including fundamental positive sequence can be administered.
Preferably, in step (2), when being in normal power supply or energy feedback, the IC1 *And IC2 *It is zero, the IC1
And IC2Such as following formula:
Work as IC1When with A phase network pressure same-phase, energy flows to subway traction power supply net through power circulation device from three phase network；
Work as IC1When with A phase network pressure antiphase, energy flows to three phase network through power circulation device from subway traction power supply net；
Preferably, in step (2), work as IC1 *And IC2 *When for following formula, can be realized idle fundamental positive sequence, fundamental wave negative sequence and
Harmonic wave control,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence improvement can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and the idle improvement of fundamental positive sequence can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, idle improvement can be realized,
Work as IC1 *And IC2 *When for following formula, harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, it can be realized that fundamental positive sequence is idle and harmonic wave control,
Compared with the prior art, the advantages of the present invention are as follows:
Metro traction power system based on power circulation type of the invention not only has the function of normal power supply, but also can be with
Energy feedback is carried out, the electric energy for being in addition also able to achieve three phase supply power grid is administered, and it is full-featured and be easily achieved, and also power melts
Exchange device is constituted using single-phase transformer and full-bridge circuit, and structure is simple, cost is relatively low.Of the invention is circulated based on power
The control method of the metro traction power system of type equally has the advantages that described in system as above, and it is easy to operate, function is complete
It face and is easily achieved.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is that power circulates work order electric current acquisition block diagram of the device in operating mode 1 and operating mode 2；
Energy flow block diagram when Fig. 3 is normal power supply in the present invention.
Energy flow block diagram when Fig. 4 is energy feedback in the present invention.
Fig. 5 is that this power circulates work order electric current acquisition block diagram of the device at operating mode 3,4,5；
Energy flow block diagram when Fig. 6 is operating mode 5.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figures 1 to 6, the metro traction power system based on power circulation type of the present embodiment, including power melt
Exchange device, wherein one end of power circulation device is connected with external three phase network, and the other end is then connected with subway traction power supply net；
It includes control unit, two single-phase transformers (T1 and T2 as shown in figure 1), two full-bridge circuits (by four that power, which circulates device,
The H-bridge circuit that IGBT module is constituted, H1 and H2) an and intermediate capacitance C, one end of two single-phase transformer primary sides is respectively with three
The two-phase of phase power grid is connected, and the other end of two single-phase transformer primary sides is then connected (such as Fig. 1 institute with the third phase of three phase network
Show, the primary side both ends of T1 connect the AB two-phase in three-phase respectively, and the primary side both ends of T2 connect the BC two-phase in three-phase respectively), two lists
The secondary side of phase transformer is connected with the input terminal of two full-bridge circuits respectively, and the output end of two full-bridge circuits is connected, intermediate electricity
Hold the positive negative feeder that and its both ends in parallel with the output end of two full-bridge circuits are connected to the ground railway traction power supply network；Single-phase transformer
T1 and T2 is used to for three-phase power grid voltage to be down to full-bridge circuit H1 and H2 operating voltage, realizes the connection of full-bridge circuit and power grid；
Two full-bridge circuits are for realizing energy flow, and intermediate capacitance is for providing energy channel；Control unit is connected with full-bridge circuit
It is controlled for the output to two full-bridge circuits, i.e. the output of progress intermediate capacitance is controlled, to realize external power supply electricity
The flowing of energy between net and subway traction power supply net, including normal power supply and energy feedback, in addition can also be individually or simultaneously
Realize the power-balance of external three phase network, i.e. realization negative phase-sequence, idle or harmonic wave control.
Metro traction power system based on power circulation type of the invention not only has the function of normal power supply, but also can be with
Energy feedback is carried out, the electric energy for being in addition also able to achieve three phase supply power grid is administered, and it is full-featured and be easily achieved, reach load-side
With the dual improvement of net side, and power circulation device is constituted using single-phase transformer and full-bridge circuit, and structure is simple, cost
It is lower.
The present invention further correspondingly discloses a kind of control method of metro traction power system based on power circulation type, such as schemes
Shown in 1, in the present embodiment, three-phase electricity current on line side is IA、IB、IC, threephase load side electric current is Ia、Ib、Ib.Because of three-phase system
Without containing zero-sequence component, so load current is decomposed into, fundamental positive sequence is active, fundamental positive sequence is idle, fundamental wave negative sequence, harmonic forms
Formula.As shown in formula (3):
In formula (3), If1p、If1p*α2、If1p* α is A, B, C phase fundamental positive sequence active component；If1q、If1q*α2、If1q* α be A,
B, C phase fundamental positive sequence reactive component；If2、If2*α、If2*α2For A, B, C phase fundamental wave negative sequence component；Iah、Ibh、IchRespectively three-phase
Load current harmonic component, α are complex operator, α=ej120°, wherein 1+ α+α2=0；
Before not compensating, three phase network electric current IA、IB、ICEqual to threephase load electric current Ia、Ib、Ib, electricity after compensation is added
Net electric current is the sum of load current and compensation electric current, such as following formula:
When QF closure, power circulation device can work under four kinds of modes:
Operating mode 1: pure powering mode；
Operating mode 2: pure energy feedback mode；
Operating mode 3: power supply and electric energy governance model；
Operating mode 4: energy feedback and electric energy governance model；
When QF is disconnected, power circulation device has one mode, and operating mode 5: electric energy governance model, wherein electric energy is administered
Mode includes one or more combinations in idle fundamental positive sequence, fundamental wave negative sequence and harmonic wave control.
Wherein operating mode 1 and power when operating mode 2 circulate device work order electric current IC1And IC2Obtain block diagram such as
Shown in Fig. 2.U in Fig. 2dcFor DC capacitor C the two poles of the earth U in Fig. 1dc+With Udc-Between DC voltage, Udc_refElectricity is maintained for target
Pressure, UdcWith UrefMake the difference to obtain Δ UdcAfterwards, by the processing of control unit, it is changing into fundamental positive sequence active component I2f1pWith
I2f1p* α, i.e., respectively power circulates device work order electric current IC1And IC2, the component represent meaning as power circulate device damage
Electric current needed for consuming and power demands electric current or energy feedback electric current, such as following formula:
When power circulation device is in operating mode 1, IC1With A phase network pressure same-phase, energy flow is as shown in figure 3, from three
Phase power grid flows to metro traction net through power circulation device；
When power circulation device is in operating mode 2, IC1With A phase network pressure antiphase, energy flow is as shown in figure 4, from ground
Railway traction net flows to three phase network through power circulation device.
In operating mode 3, operating mode 4 and operating mode 5, power circulates device work order electric current IC1And IC2It obtains
Take block diagram as shown in Figure 5.It include a target current decomposition operation module in Fig. 5, to obtain three phase network target compensation electric current
IC1 *And IC2 *；Control unit is handled UdcWith Udc_refMake the difference to obtain Δ UdcIt is processed into fundamental positive sequence active component I2f1pAnd I2f1p*
α, power circulate device work order electric current IC1、IC2By target compensation electric current IC1 *、IC2 *With fundamental positive sequence active component I2f1p、
I2f1p* α is accordingly formed by stacking.Such as following formula:
As target compensation electric current IC1 *And IC2 *It can be obtained through target current decomposition operation decomposition module shown in following formula 5:
(4), (5) are substituted into (2) to three phase network electric current after can get power circulation device work.It is as follows:
From formula (6) as it can be seen that power circulation device work contains only fundamental positive sequence in mode 3 or 4 or 5 in three phase network
Active, effect is ideal.
Similarly, if target compensation electric current IC1 *And IC2 *It can be through target current decomposition operation decomposition module at formula (7), public affairs
Formula (8), formula (9), formula (10), formula (11) or formula (12), the device work of power circulation at this time is in mode 3 or 4 or 5
When, by one or both of tool negative phase-sequence, idle, harmonic compensation function.
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence improvement can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and the idle improvement of fundamental positive sequence can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, idle improvement can be realized,
Work as IC1 *And IC2 *When for following formula, harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, it can be realized that fundamental positive sequence is idle and harmonic wave control,
When power circulation device is in operating mode 3, I in formula (6)2f1pWith A phase network pressure same-phase, energy flow is as schemed
Shown in 3, metro traction net is flowed to from three phase network through power circulation device；
When power circulation device is in operating mode 4, I in formula (6)2f1pWith A phase network pressure antiphase, energy flow such as Fig. 4
It is shown, three phase network is flowed to from metro traction net through device.
When power circulation device is in operating mode 5, I in formula (6)2f1pWith A phase network pressure same-phase, energy flow is as schemed
Shown in 5, metro traction net is flowed to from three phase network through device.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (5)
1. a kind of metro traction power system based on power circulation type, which is characterized in that circulate device, the function including power
It includes control unit, two single-phase transformers, two full-bridge circuits and an intermediate capacitance, two full-bridge circuits that rate, which circulates device,
Formed back to back structure form and share intermediate capacitance, the ac output end of two full-bridge circuits respectively with two single-phase transformers
Secondary side be connected, the both ends of the intermediate capacitance are connected with subway traction power supply net, and one end of two single-phase transformer primary sides is divided
It is not connected with the two-phase in three phase network, the other end of two single-phase transformer primary sides is then connected with the third phase of three phase network,
Control unit is connected with the full-bridge circuit, for controlling the output electric current of the full-bridge circuit to realize normal power supply, energy
The power-balance of feedback and three phase network；It is provided with switch between the power circulation device and subway traction power supply net, when
Described when closing the switch, the power circulation device switches between four kinds of operating modes, and four kinds of operating modes include just
Normal powering mode, energy feedback mode, normal power supply add governance model and energy feedback to add governance model；When the switch
When disconnection, power circulation device is then in governance model, wherein governance model include idle fundamental positive sequence, fundamental wave negative sequence and
One or more combinations of harmonic wave control.
2. the metro traction power system according to claim 1 based on power circulation type, which is characterized in that described in two
Full-bridge circuit is the H-bridge circuit being made of four IGBT modules.
3. a kind of control method based on the metro traction power system of any of claims 1 or 2 based on power circulation type,
It is characterized in that, comprising the following steps:
(1) three phase network target compensation electric current I is obtainedC1 *And IC2 *, while by UdcWith Udc_refMake the difference to obtain Δ UdcIt is processed into fundamental wave just
Sequence active component I2f1pAnd I2f1p* α, as electric current and power demands electric current or energy feedback electric current needed for being lost, wherein UdcFor
The voltage at intermediate capacitance both ends, Udc_refFor target maintenance voltage；The then work order electric current I of two full-bridge circuitsC1、IC2By mesh
Mark compensation electric current IC1 *、IC2 *With fundamental positive sequence active component I2f1p、I2f1p* α is accordingly formed by stacking, such as following formula:
(2) by work order electric current IC1And IC2It compensates into three phase network, at this time three phase network electric current IA、IB、ICIt is negative equal to three-phase
Carry electric current Ia、Ib、IcThe sum of with work order electric current, such as following formula:
Wherein
In formula (3), If1p、If1p*α2、If1p* α is A, B, C phase fundamental positive sequence active component；If1q、If1q*α2、If1q* α is A, B, C
Phase fundamental positive sequence reactive component；If2、If2*α、If2*α2For A, B, C phase fundamental wave negative sequence component；Iah、Ibh、IchRespectively three-phase is negative
Current harmonics component is carried, α is complex operator, α=ej120°, wherein 1+ α+α2=0；
By full-bridge circuit to three phase network target compensation electric current IC1 *And IC2 *It is adjusted, to realize that normal power supply, energy return
It carries out carrying out electric energy improvement when electric energy improvement, energy feedback when feedback, normal power supply or independent electric energy is administered；Wherein electric energy is controlled
Reason idle, fundamental wave negative sequence and harmonic wave control one or more combinations including fundamental positive sequence.
4. the control method of the metro traction power system according to claim 3 based on power circulation type, feature exist
In,
In step (2), when being in normal power supply or energy feedback, the IC1 *And IC2 *It is zero, the IC1And IC2Such as following formula:
Work as IC1When with A phase network pressure same-phase, energy flows to subway traction power supply net through power circulation device from three phase network；
Work as IC1When with A phase network pressure antiphase, energy flows to three phase network through power circulation device from subway traction power supply net.
5. the control method of the metro traction power system according to claim 4 based on power circulation type, feature exist
In,
In step (2), work as IC1 *And IC2 *When for following formula, idle fundamental positive sequence, fundamental wave negative sequence and harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence improvement can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and the idle improvement of fundamental positive sequence can be realized,
Work as IC1 *And IC2 *When for following formula, fundamental wave negative sequence and harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, idle improvement can be realized,
Work as IC1 *And IC2 *When for following formula, harmonic wave control can be realized,
Work as IC1 *And IC2 *When for following formula, it can be realized that fundamental positive sequence is idle and harmonic wave control,
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| CN106505562A (en) * | 2016-11-30 | 2017-03-15 | 广州中车骏发电气有限公司 | Railway power circulates potential device |
| CN109217315A (en) * | 2017-06-29 | 2019-01-15 | 中车株洲电力机车研究所有限公司 | The control method and control device of formula traction power supply power supply can be presented |
| CN109050352B (en) * | 2018-07-10 | 2020-06-26 | 中国科学院电工研究所 | Through type in-phase traction power supply system, traction substation and power supply control method thereof |
| TWI700880B (en) * | 2019-09-12 | 2020-08-01 | 陳正一 | Selective compensation strategy applied in shunt activepower filter and a switch circuit thereof |
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