CN105811434A - Active capacity balancing device and balancing method of power distribution system - Google Patents
Active capacity balancing device and balancing method of power distribution system Download PDFInfo
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- CN105811434A CN105811434A CN201610319642.7A CN201610319642A CN105811434A CN 105811434 A CN105811434 A CN 105811434A CN 201610319642 A CN201610319642 A CN 201610319642A CN 105811434 A CN105811434 A CN 105811434A
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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
- H02J3/1878—Arrangements for adjusting, eliminating or compensating reactive power in networks using tap changing or phase shifting transformers
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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
- 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
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Abstract
The invention relates to an active capacity balancing device and balancing method of a power distribution system. The device comprises a first bidirectional transducer, a second bidirectional transducer, a first controller and a second controller, wherein the first bidirectional transducer is connected with a DC bus and a power distribution transformer in the device and is used for stabilizing the voltage of the DC bus and carrying out reactive compensation on the corresponding power distribution transformer, the second bidirectional transducer is connected with the DC bus and another power distribution transformer and is used for controlling the size and the direction of active current and carrying out reactive compensation on the corresponding power distribution transformer, the first controller is used for driving the first bidirectional transducer to work according to the voltage of the DC bus, the output current of the first bidirectional transducer and the reactive power of a load carried in the corresponding power distribution transformer, and the second controller is used for driving the second bidirectional transducer to work according to the active power of the loads carried in the two power distribution transformers, the output current of the second bidirectional transducer and the reactive power of the load carried in the corresponding power distribution transformer. By the device, local power distribution capacity expansion and local reactive compensation can be achieved, and the power distribution capacity of a circuit is not needed to be expanded.
Description
Technical field
The present invention relates to power domain, particularly relate to a kind of distribution system active capacity balancer and equalization methods thereof.
Background technology
Along with the raising of expanding economy and living standards of the people, power consumption increases sharply, and the former equipment building power distribution network and wire all do not match that with power consumption, many local overload operations, not only affects power supply safety, also greatly increases the loss of distribution system.In power supply-distribution system, inductive load increases sharply simultaneously, numerous distribution transformers and motor are in the non-economy running status of underload rate, cause the wilderness demand of power supply-distribution system reactive power, as supplemented not in time, to cause supply voltage Quality Down, system loss increases, and should waste electric energy, the utilization rate of power supplying and distributing equipment will be affected again, even cause the accident.
Solving at present the technical measures of problem above is more new line and equipment, increase and the capacity of the capacity of circuit and distribution transformer in modernization system, add prosthetics electric capacity at supplier of electricity and electricity consumption side simultaneously, reduce line loss, improve economic row and safety that system is run.It is big to there is technological transformation difficulty in these remodeling methods, and cost is high, and capacity configuration is dumb, and the problem such as follow-up dilatation is difficult.When especially for localized power distribution off-capacity, the difficulty of its transformation strengthens especially.
Summary of the invention
The technical problem to be solved in the present invention is in that, for the drawbacks described above of prior art, it is provided that a kind of distribution system active capacity balancer and equalization methods thereof.
The technical solution adopted for the present invention to solve the technical problems is: a kind of distribution system active capacity balancer of structure, described distribution system includes at least one grid branch being connected with high voltage bus, each grid branch is provided with a distribution transformer, the input of distribution transformer is connected with high voltage bus and outfan is connected with load, described device is connected between the outfan of two distribution transformers, and described device includes:
First reversible transducer, the dc bus in connecting device and one of them distribution transformer, for the voltage of stable DC bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, for controlling the size and Orientation of watt current and corresponding distribution transformer being carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer, the output electric current of the first reversible transducer of sampling；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer, the output electric current of the second reversible transducer of sampling；
First controller, connecting voltage sampling unit, the first current sampling unit and the first reversible transducer respectively, the reactive power of the load for being with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；
Second controller, connecting the second current sampling unit and the second reversible transducer respectively, the reactive power of the load being with for the active power of load being with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer drives the second reversible transducer work.
In distribution system active capacity balancer of the present invention, described first controller includes:
Voltage control loop, the voltage Ubus_Fb for the dc bus according to given busbar voltage reference value Ubus and sampling calculates the reference value Id_ref obtaining watt current；
First coordinate converter, for will the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1.
In distribution system active capacity balancer of the present invention, described second controller includes:
First coordinate converter, for will the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains:
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2.
In distribution system active capacity balancer of the present invention, described first reversible transducer and the second reversible transducer all include: N number of brachium pontis, N number of first electric capacity, N number of first inductance, N number of second inductance, N number of reactance, two bus capacitors, wherein N is the integer of 1-3；Each brachium pontis includes brachium pontis, lower brachium pontis, the first diode and the second diode, upper brachium pontis and lower brachium pontis and all includes: the device for power switching of two concatenations and inverse parallel fly-wheel diode on each device for power switching；
Two bus capacitors are serially connected between positive direct-current bus and negative dc bus, and the connection node of two bus capacitors is as the midpoint of dc bus；The end that controls of all of device for power switching connects with the first corresponding controller/second controller respectively, the negative pole connecting node and the first diode of two device for power switching of each upper brachium pontis connects, the positive pole connecting node and the second diode of two device for power switching of each lower brachium pontis connects, and the positive pole of the first diode and the negative pole of the second diode are connected to the midpoint of dc bus；First end of N number of first electric capacity is connected to the midpoint of dc bus, second end of N number of first electric capacity is connected with the first end of the first end of N number of first inductance and N number of second inductance respectively, second end of N number of first inductance is respectively connecting to the upper brachium pontis of N number of brachium pontis and the connection node place of lower brachium pontis, and the second end of N number of second inductance is divided and is connected with the outfan of distribution transformer by N number of reactance.
In distribution system active capacity balancer of the present invention, described first reversible transducer and/or the second reversible transducer are connected with corresponding distribution transformer by an isolating transformer.
The invention also discloses a kind of distribution system active capacity equalization methods based on described device, said method comprising the steps of:
The active power of the load that S0, the voltage of real-time sampling dc bus, the output electric current of the first reversible transducer, the output electric current of the second reversible transducer, two distribution transformers are with and reactive power；
The reactive power of the load that S1, the first controller are with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；The reactive power of the load that the active power of the load that second controller is with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer are with drives the second reversible transducer work；
The voltage of S2, the first reversible transducer stable DC bus under the driving of the first controller and corresponding distribution transformer is carried out reactive-load compensation；Second reversible transducer controls the size and Orientation of watt current under the driving of second controller and corresponding distribution transformer is carried out reactive-load compensation.
In distribution system active capacity equalization methods of the present invention, driving the first reversible transducer work described in step S1 includes:
Busbar voltage reference value Ubus and the voltage Ubus_Fb of the dc bus of sampling that S11a, basis are given calculate the reference value Id_ref obtaining watt current；Meanwhile, by the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then d shaft current i is obtained by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12a, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1；
S13a, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14a, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
In distribution system active capacity equalization methods of the present invention, driving the second reversible transducer work described in step S1 includes:
S11b, by the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12b, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains,
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2；
S13b, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14b, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
Implement distribution system active capacity balancer and the equalization methods thereof of the present invention, have the advantages that assembly of the invention can apply between two distribution transformers, realize localized power distribution capacity enlargement and local reactive-load compensation, without the distribution capacity strengthening corresponding transformator and circuit, cost is low, and capacity configuration is flexible.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the mounting structure schematic diagram of distribution system active capacity balancer of the present invention；
Fig. 2 is the structured flowchart of distribution system active capacity balancer of the present invention；
Fig. 3 is the circuit theory diagrams of two reversible transducers in Fig. 2；
Fig. 4 is the illustraton of model of the first controller in Fig. 2；
Fig. 5 is the illustraton of model of the second controller in Fig. 2；
Fig. 6 is the flow chart of distribution system active capacity equalization methods of the present invention；
Fig. 7 is the flow chart driving the first reversible transducer work described in step S1；
Fig. 8 is the flow chart driving the second reversible transducer work described in step S1.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and effect are more clearly understood from, now comparison accompanying drawing describes the specific embodiment of the present invention in detail.
With reference to Fig. 1, it it is the mounting structure schematic diagram of distribution system active capacity balancer of the present invention.
The distribution system that assembly of the invention is applied includes: at least one grid branch that high voltage bus is connected with high voltage bus, three grid branch it have been diagrammatically only by out in figure, each grid branch is provided with a distribution transformer, in figure shown in T1, T2, T3, T1, T2, T3 are generally the distribution transformer in the Relatively centralized regions such as a solitary building Huo Yige industrial park.The input of distribution transformer T1, T2, T3 is connected with high voltage bus and outfan is connected with load Load1, Load2, Load3, the voltage of high voltage bus is carried out blood pressure lowering by distribution transformer T1, T2, T3 respectively, supplies load Load1, Load2, Load3 of respective rear end.The active capacity balancer of the present invention is connected between the outfan of two distribution transformers, and in figure, namely APCS represents the active capacity balancer of the present invention, and A, B represent the outfan of distribution transformer T1, T2 respectively.
APCS can be arranged as required between two grid branch to realize localized power distribution capacity enlargement, such as, if the active power of Load1 is more than the meritorious capacity P0 of distribution transformer, and the active power of Load2 is less than the meritorious capacity P0 of distribution transformer, then can consider between the distribution transformer of the two grid branch, to increase an APCS to realize localized power distribution capacity enlargement and local reactive-load compensation problem.
Concrete, with reference to Fig. 2, described device includes:
First reversible transducer, the dc bus in connecting device and one of them distribution transformer, for the voltage of stable DC bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, for controlling the size and Orientation of watt current and corresponding distribution transformer being carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer, the output electric current of the first reversible transducer of sampling；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer, the output electric current of the second reversible transducer of sampling；
First controller, connecting voltage sampling unit, the first current sampling unit and the first reversible transducer respectively, the reactive power of the load for being with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；
Second controller, connecting the second current sampling unit and the second reversible transducer respectively, the reactive power of the load being with for the active power of load being with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer drives the second reversible transducer work.
Wherein, the first controller and second controller can adopt PI controller.
Preferably, described first reversible transducer and/or the second reversible transducer are connected with corresponding distribution transformer by an isolating transformer.
With continued reference in Fig. 1, assuming that the amount of capacity of distribution transformer T1, T2, T3 is P0/Q0/S0, power respectively P1/Q1/S1, P2/Q2/S2, P3/Q3/S3 of each distribution transformer T1, T2, T3 backend load, P0-P3 represents meritorious capacity, Q0-Q3 represents reactive capability, and S0-S3 represents apparent capacity.The power flow through above APCS is Δ P/QA/QB。
Without installing APCS additional, then the maximum system capacity that each power supply unit can bear is transformer capacity, i.e. S1≤S0, S2≤S0, S3≤S0.If a certain load increases and exceeds the meritorious capacity of distribution transformer in system, assume P1 > P0, P2 < P0, P3≤P0, then active power is flowed to A by B by APCS, it is sized to Δ P (it is reference direction that power is flowed to A by B), power system capacity respectively P1=P0+ Δ P, the P2=P0-Δ P that therefore Load1 and Load2 place obtains.In like manner, if P1 is < P0, P2 > P0, P3≤P0, then and active power is flowed to B by A by APCS.
It addition, if there is bigger reactive load at T1 and T2 place, then APCS sends idle Q at A portA, send idle Q at B portB, and then compensate the reactive load that distribution transformer goes out, i.e. T1 place Q0=Q1-QA, T2 place Q0=Q2-QB；The capacity of APCS device is only dependent upon Δ P, QA, QBSize, be generally much less than the capacity of transformator.
With reference to Fig. 3, first reversible transducer, the second reversible transducer are used that in figure representation shown in 100, it all includes: N number of brachium pontis, N number of first electric capacity C1, N number of first inductance L1, N number of second inductance L2, N number of reactance Z1, two bus capacitor C0, wherein N is the integer of 1-3, and in the present embodiment, N is 3.
Each brachium pontis includes brachium pontis, lower brachium pontis, the first diode D1 and the second diode D2, upper brachium pontis and lower brachium pontis and all includes: the device for power switching of two concatenations and inverse parallel fly-wheel diode on each device for power switching.Device for power switching can be audion, for instance the audion of the NPN type selected in figure, the emitter stage of the positive pole connecting triode of fly-wheel diode, the colelctor electrode of the negative pole connecting triode of fly-wheel diode.
Two bus capacitor C0 are serially connected between positive direct-current bus and negative dc bus, and two bus capacitor C0 connect the node midpoint as dc bus, in figure shown in N；The end that controls of all of device for power switching connects with the first corresponding controller/second controller respectively, the negative pole connecting node and the first diode D1 of two device for power switching of each upper brachium pontis connects, the positive pole connecting node and the second diode D2 of two device for power switching of each lower brachium pontis connects, and the positive pole of the first diode D1 and the negative pole of the second diode D2 are connected to the midpoint of dc bus；First end of N number of first electric capacity C1 is connected to the midpoint of dc bus, second end of N number of first electric capacity C1 is connected with the first end of first end of N number of first inductance L1 and N number of second inductance L2 respectively, second end of N number of first inductance L1 is respectively connecting to the upper brachium pontis of N number of brachium pontis and the connection node place of lower brachium pontis, and second end of N number of second inductance L2 is divided and is connected with the outfan of distribution transformer by N number of reactance Z1.
According to above-mentioned known, if the active power of Load1 is more than P0, and Load2 less than P0, then active power is flowed to A by B by APCS, being stored in dc bus particularly as follows: the part alternating current in the grid branch of T2 place is converted to unidirectional current by the second reversible transducer, then the DC inverter in dc bus is that alternating current exports T1 place grid branch by the first reversible transducer again.
It should be explicitly made clear at this point, although the above is a specific embodiment of the reversible transducer for three-phase, actually reversible transducer can be three-phase, can also be single-phase, can being three-level converter, it is also possible to be two level converters, the physical switch of changer be any power conversion device, two reversible transducers can be independent converter module, it is also possible to is integrated in circuitry together.It addition, the control strategy in scheme, no matter it is that employing is digital control, or adopts analog circuit to control, be the deformation of the present invention, all within protection scope of the present invention.
Mentioned above, the first reversible transducer is used for the voltage of stable DC bus and corresponding distribution transformer is carried out reactive-load compensation, and the second reversible transducer is for controlling the size and Orientation of watt current and corresponding distribution transformer being carried out reactive-load compensation.It practice, the control of the equalizing sections for meritorious capacity, it is also possible to the function of two changers of exchange, namely the first reversible transducer is for controlling the size and Orientation of watt current, and the second reversible transducer is for the voltage of stable DC bus.It is used for controlling the size and Orientation of watt current for the first reversible transducer for the voltage of stable DC bus, the second reversible transducer below, structure and the operation principle of its two corresponding controllers are described.
With reference to Fig. 4, described first controller includes:
Voltage control loop, the voltage Ubus_Fb for the dc bus according to given busbar voltage reference value Ubus and sampling calculates the reference value Id_ref obtaining watt current；
First coordinate converter, for will the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1.
With reference to Fig. 5, described second controller includes:
First coordinate converter, for will the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains:
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2.
With reference to Fig. 6, accordingly, the invention also discloses a kind of distribution system active capacity equalization methods based on described device, said method comprising the steps of:
S0, voltage sampling unit real-time sampling dc bus voltage, the output electric current of first current sampling unit real-time sampling the first reversible transducer, the output electric current of second current sampling unit real-time sampling the second reversible transducer, detects active power and the reactive power of the load that two distribution transformers are with；
The reactive power of the load that S1, the first controller are with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；The reactive power of the load that the active power of the load that second controller is with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer are with drives the second reversible transducer work；
The voltage of S2, the first reversible transducer stable DC bus under the driving of the first controller and corresponding distribution transformer is carried out reactive-load compensation；Second reversible transducer controls the size and Orientation of watt current under the driving of second controller and corresponding distribution transformer is carried out reactive-load compensation.
With reference to Fig. 7, wherein, driving the first reversible transducer work described in step S1 includes:
Busbar voltage reference value Ubus and the voltage Ubus_Fb of the dc bus of sampling that S11a, basis are given calculate the reference value Id_ref obtaining watt current；Meanwhile, by the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then d shaft current i is obtained by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12a, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1；
S13a, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14a, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
With reference to Fig. 8, wherein, driving the second reversible transducer work described in step S1 includes:
S11b, by the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12b, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains,
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2；
S13b, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14b, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
In sum, implement distribution system active capacity balancer and the equalization methods thereof of the present invention, have the advantages that assembly of the invention can apply between two distribution transformers, realize localized power distribution capacity enlargement and local reactive-load compensation, without the distribution capacity strengthening corresponding transformator and circuit, cost is low, and capacity configuration is flexible.
Above in conjunction with accompanying drawing, embodiments of the invention are described; but the invention is not limited in above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is merely schematic; rather than it is restrictive; those of ordinary skill in the art is under the enlightenment of the present invention; without departing under present inventive concept and scope of the claimed protection situation, it may also be made that a lot of form, these belong within the protection of the present invention.
Claims (8)
1. a distribution system active capacity balancer, described distribution system includes at least one grid branch being connected with high voltage bus, each grid branch is provided with a distribution transformer, the input of distribution transformer is connected with high voltage bus and outfan is connected with load, it is characterized in that, described device is connected between the outfan of two distribution transformers, and described device includes:
First reversible transducer, the dc bus in connecting device and one of them distribution transformer, for the voltage of stable DC bus and corresponding distribution transformer is carried out reactive-load compensation；
Second reversible transducer, connects described dc bus and another distribution transformer, for controlling the size and Orientation of watt current and corresponding distribution transformer being carried out reactive-load compensation；
Voltage sampling unit, the voltage of described dc bus of sampling；
First current sampling unit, connects with one end being connected with distribution transformer of the first reversible transducer, the output electric current of the first reversible transducer of sampling；
Second current sampling unit, connects with one end being connected with distribution transformer of the second reversible transducer, the output electric current of the second reversible transducer of sampling；
First controller, connecting voltage sampling unit, the first current sampling unit and the first reversible transducer respectively, the reactive power of the load for being with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；
Second controller, connecting the second current sampling unit and the second reversible transducer respectively, the reactive power of the load being with for the active power of load being with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer drives the second reversible transducer work.
2. distribution system active capacity balancer according to claim 1, it is characterised in that described first controller includes:
Voltage control loop, the voltage Ubus_Fb for the dc bus according to given busbar voltage reference value Ubus and sampling calculates the reference value Id_ref obtaining watt current；
First coordinate converter, for will the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1.
3. distribution system active capacity balancer according to claim 1, it is characterised in that described second controller includes:
First coordinate converter, for will the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
Current regulator, for according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle；
Second coordinate converter, for by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
SPWM driver, obtains, for carrying out space vector modulation according to SPWM control instruction uact, the PWM drive signal driving the first reversible transducer；
Wherein, the reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains:
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2.
4. distribution system active capacity balancer according to claim 1, it is characterized in that, described first reversible transducer and the second reversible transducer all include: N number of brachium pontis, N number of first electric capacity, N number of first inductance, N number of second inductance, N number of reactance, two bus capacitors, wherein N is the integer of 1-3；Each brachium pontis includes brachium pontis, lower brachium pontis, the first diode and the second diode, upper brachium pontis and lower brachium pontis and all includes: the device for power switching of two concatenations and inverse parallel fly-wheel diode on each device for power switching；
Two bus capacitors are serially connected between positive direct-current bus and negative dc bus, and the connection node of two bus capacitors is as the midpoint of dc bus；The end that controls of all of device for power switching connects with the first corresponding controller/second controller respectively, the negative pole connecting node and the first diode of two device for power switching of each upper brachium pontis connects, the positive pole connecting node and the second diode of two device for power switching of each lower brachium pontis connects, and the positive pole of the first diode and the negative pole of the second diode are connected to the midpoint of dc bus；First end of N number of first electric capacity is connected to the midpoint of dc bus, second end of N number of first electric capacity is connected with the first end of the first end of N number of first inductance and N number of second inductance respectively, second end of N number of first inductance is respectively connecting to the upper brachium pontis of N number of brachium pontis and the connection node place of lower brachium pontis, and the second end of N number of second inductance is divided and is connected with the outfan of distribution transformer by N number of reactance.
5. distribution system active capacity balancer according to claim 1, it is characterised in that described first reversible transducer and/or the second reversible transducer are connected with corresponding distribution transformer by an isolating transformer.
6. the distribution system active capacity equalization methods based on device described in claim 1, it is characterised in that said method comprising the steps of:
The active power of the load that S0, the voltage of real-time sampling dc bus, the output electric current of the first reversible transducer, the output electric current of the second reversible transducer, two distribution transformers are with and reactive power；
The reactive power of the load that S1, the first controller are with based on the voltage of dc bus, the output electric current of the first reversible transducer, corresponding distribution transformer drives the first reversible transducer work；The reactive power of the load that the active power of the load that second controller is with based on two distribution transformers, the output electric current of the second reversible transducer, corresponding distribution transformer are with drives the second reversible transducer work；
The voltage of S2, the first reversible transducer stable DC bus under the driving of the first controller and corresponding distribution transformer is carried out reactive-load compensation；Second reversible transducer controls the size and Orientation of watt current under the driving of second controller and corresponding distribution transformer is carried out reactive-load compensation.
7. distribution system active capacity equalization methods according to claim 6, it is characterised in that driving the first reversible transducer work described in step S1 includes:
Busbar voltage reference value Ubus and the voltage Ubus_Fb of the dc bus of sampling that S11a, basis are given calculate the reference value Id_ref obtaining watt current；Meanwhile, by the output electric current Iabc_Fb of the first reversible transducer of sampling after three-phase to two phase inversion, then d shaft current i is obtained by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12a, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reactive power Q 1 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V1 at place calculate and obtain, Iq_ref=Q1/V1；
S13a, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14a, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
8. distribution system active capacity equalization methods according to claim 6, it is characterised in that driving the second reversible transducer work described in step S1 includes:
S11b, by the output electric current Iabc_Fb of the second reversible transducer of sampling after three-phase to two phase inversion, then obtained d shaft current i by under the biphase dq of transforming to coordinate systemdWith q shaft current iq；
S12b, according to the reference value Id_ref of watt current, the reference value Iq_ref of reactive current, d shaft current idWith q shaft current iqCalculate the output order obtaining d axle, q axle, 0 axle, wherein:
The reference value Id_ref of watt current is that the meritorious capacity P0 according to distribution transformer and two calculated Δ P of load active power P1, P2 and grid branch voltage V1 calculating obtains,
The reactive power Q 2 of the load that the reference value Iq_ref of reactive current is with according to the corresponding distribution transformer detected and the grid branch voltage V2 at place calculate and obtain, Iq_ref=Q2/V2；
S13b, by d axle, q axle, 0 axle output order after Coordinate Conversion, obtain SPWM control instruction uact；
S14b, carry out according to SPWM control instruction uact space vector modulation obtain drive the first reversible transducer PWM drive signal.
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