CN109600051B - Non-full-capacity through type in-phase power supply device and control method thereof - Google Patents

Abstract

A non-full-capacity through type cophase power supply device and a control method thereof are disclosed, wherein a Scott traction transformer T_tracAnd a non-full-capacity cophase supply converter C_PAnd (4) forming. Non-full capacity cophase supply converter C_PThe traction transformer α phase and β phase voltage are connected in series to obtain a voltage u with the amplitude of the voltage of the contact network 1/k (k is more than 1)_αn1+u_βn2Voltage u at output port of non-full capacity cophase power supply converter_invConnected in series with the voltage to a contact network, a converter C_PAll active power required by the train can be transmitted only by outputting (1-1/k) of the voltage of the contact network. At different supply station voltages u_αn1+u_βn2In case of a gap, u can be adjusted_invAnd the full-line through type in-phase power supply is realized. At the same time, non-full capacity cophase supply current transformer C_PCurrent i through control port a_AAnd current i of port b_BThe negative sequence and the reactive current of the three-phase power grid side can be effectively inhibited.

Description

Non-full-capacity through type in-phase power supply device and control method thereof

Technical Field

The present invention relates to a through-type in-phase power supply device and a control method thereof, and more particularly, to a non-full-capacity through-type in-phase power supply device and a control method thereof.

Background

In the existing traction power supply system of the electrified railway, because a single-phase power supply system of the railway system cannot be directly matched with a three-phase system of a public power grid, the railway power supply system has to adopt split-phase power supply in different power supply sections, namely, different sections adopt a certain phase in the three-phase power grid for power supply. The presence of the electrically split phases causes traction and speed losses in the locomotive passing through the inter-phase isolation zones and results in negative sequence currents in the three-phase supply network, and the negative sequence currents become increasingly severe as the power of the locomotive increases.

In order to solve the above problems, experts and scholars have proposed an in-phase power supply system, that is, an electric phase splitting in the existing power supply system is eliminated, so that the amplitude and phase of the voltage obtained by the locomotive during operation are kept continuous without sudden change.

Although the active compensation type in-phase power supply has the capability of in-phase power supply, the output voltage of each traction power supply is mainly determined by a certain output winding of the traction transformer, and the phases of the output voltages of adjacent traction transformers cannot be completely the same, so that the power supply quality and reliability of the in-phase traction power supply system are reduced. Therefore, although the electric phase splitting device in the traction substation can be eliminated, the electric phase splitting device between the traction substations cannot be eliminated, and the problem of over-passing phase splitting still exists, as described in patents CN201210057280.0 and CN 201310487237.2.

The phases of all sectional voltages supplied by different traction power transformers supplied by the through-type same-phase power supply are almost completely the same, and no phase splitting device exists on the contact network. However, the converter of the existing through-type in-phase power supply scheme bears all the active power of the load, and the converter has large capacity and high manufacturing cost, as described in patents CN201520230853.4 and CN 201810124008.7.

Disclosure of Invention

The invention aims to overcome the defects that an active compensation type in the existing in-phase power supply device still has an over-split phase problem, and a through type converter has high withstand voltage and large required capacity, and provides a non-full-capacity through type in-phase power supply converter.

The invention relates to a non-full-capacity through type cophase power supply device, which is composed of a Scott traction transformer T_tracAnd a non-full-capacity cophase supply converter C_PAnd (4) forming. Scott traction transformer T_tracIs connected to the three-phase network, a Scott traction transformer T_tracOutput side and non-full capacity cophase supply converter C_PIs connected with the input side of the converter C_pOutput side and Scott traction transformer T_tracThe output ends of the α phase and the β phase are connected to a contact net after being connected.

Non-full capacity cophase supply converter C_PThe inside is electrically isolated from the output side by a high-frequency transformer. Scott traction transformer T_tracThree terminals a, b and c on the input side, and four terminals α and n on the output side₁，β，n₂(ii) a Non-full capacity cophase supply converter C_PHas a terminal of an input side port a₁、a₂The terminal of the input side port b is b₁、b₂The terminal of the output side port c is c₁、c₂. The method is characterized in that: scott traction transformer T_tracThree terminals a, b and c at the input side are respectively connected with A, B, C three phases of a three-phase power grid, and a Scott traction transformer T_tracOutput side terminal α and non-full capacity in-phase power supply converter C_PTerminal a of input side port a₁Connecting, Scott traction transformer T_tracOutput side terminal n₁Non-full capacity cophase power supply converter C_PTerminal a of input side port a₂Connecting, Scott traction transformer T_tracOutput terminal β and non-full capacity in-phase power supply converter C_PTerminal b of input side port b₁Connecting, Scott traction transformer T_tracOutput side terminal n₂Non-full capacity cophase power supply converter C_PTerminal b of input side port b₂And (4) connecting. Scott traction transformer T_tracNon-full capacity cophase supply current transformer C with output side terminals α and β connected in series_PThe port c of the output side is connected in series to supply power for a contact network, namely a Scott traction transformer T_tracThe output side terminal α is connected with a contact net, and the Scott traction transformer T_tracOutput side terminal n of₁And Scott traction transformer T_tracOutput side terminal β, Scott traction transformer T_tracOutput side terminal n of₂Non-full capacity cophase power supply converter C_PTerminal c of output side port c₂Connected, non-full capacity cophase supply current transformer C_PTerminal c of output side port c₁Is connected with the steel rail.

The control method of the non-full-capacity through type in-phase power supply device comprises the following steps:

the non-full-capacity cophase supply converter C_PThe output side port c adopts output voltage closed-loop control. Non-full capacity cophase supply converter C_PThe input side port a and the port b adopt current closed loop control. The specific control method comprises the following steps:

the non-full-capacity cophase supply converter C_PThe output side port c adopts output voltage closed-loop control, and the reference voltage given value u_{inv_ref}The value of (A) is determined by the required catenary voltage u_catenaryAnd Scott traction transformer T_tracOutput voltage u formed by connecting α phases and β phases in series_αn1+u_βn2The subtraction results, i.e.:

u_{inv_ref}＝u_catenary-(u_αn1+u_βn2)

wherein u is_αn1For Scott transformer T_tracα -phase output voltage, i.e. Scott traction transformer T_tracOutput side terminal α and terminal n₁Voltage between u_βn2For Scott transformer T_tracβ -phase output voltage, i.e. Scott traction transformer T_tracOutput side terminal β and terminal n₂Voltage between them, draw Scott the transformer T_tracThe outputs of the α phases and the β phase are connected in series, i.e. the terminals n1 and β are connected, to obtain a series output voltage u_αn1+u_βn2；u_αn1-u_βn2Is 1/k of the voltage of the contact network.

Current transformer C_PThe voltage of the port C at the output side is equal to (k-1)/k of the voltage of the overhead line system, and the converter C_PThe current of the output port C is equal to the load current, the converter C_PThe power of the output port C is (k-1)/k of the load power, namely a converter C_PThe output side capacity is (k-1)/k of the load capacity, k being an integer greater than 1.

The non-full-capacity cophase supply converter C_PThe input side port a and the port b adopt current closed loop control. Current transformer C_PCurrent i input to port a_AAnd current i of port b_BReference value i of_xrefThe reactive compensation current reference value and the negative sequence compensation current reference value are superposed to form the reactive compensation current reference value:

i_xref＝i_{xp_ref}+i_{xq_ref}+i_{xneg_ref}(x＝A，B)

wherein i_{xp_ref}Is the active current reference value, i_{xq_ref}Is a reference value for the reactive compensation current,i_{xneg_ref}is a negative sequence compensation current reference value; x is A, i_xref＝i_ArefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port a_{xp_ref}＝i_{Ap_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port a_{xq_ref}＝i_{Aq_ref}For non-full capacity cophase supply converters C_PReactive compensation current reference value of input side port a, i_{xneg_ref}＝i_{Aneg_ref}For non-full capacity cophase supply converters C_PInputting a negative sequence compensation current reference value of the side port a; x is B, i_xref＝i_BrefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port b_{xp_ref}＝i_{Bp_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port b_{xq_ref}＝i_{Bq_ref}For non-full capacity cophase supply converters C_PReactive compensation current reference value of input side port b, i_{xneg_ref}＝i_{Bneg_ref}For non-full capacity cophase supply converters C_PThe negative sequence of input side port b compensates the current reference value.

Non-full capacity cophase supply converter C_PThe active power part adopts voltage and current double closed loop control, namely capacitor voltage C_aNon-full capacity co-phase supply converter C as voltage outer loop_PCurrent i_A、i_BThe current inner loop of its input side port a and port b, respectively. Non-full capacity cophase supply converter C_PInput side port a and port b active current reference value i_{xp_ref}Is given by the output of the voltage outer loop, the active current reference value i_{xp_ref}Phase angle of (C) is equal to non-full capacity cophase supply converter_PThe phase angle of the input side voltage of (1).

Non-full capacity cophase supply converter C_PReactive compensation current reference value i of input side ports a and b_{xq_ref}Is equal to the load current i_loadIn-phase power supply converter C relative to non-full capacity_PAbsence of input-side voltageAmplitude of the power current, reference value i of reactive compensation current of port a_{Aq_ref}The phase angle of the voltage of α is advanced by 90 degrees, and the reactive compensation current reference value i of the port b_{Bq_ref}The phase angle of (d) lags by β phase voltage u_βn290°，x＝A，B。

Non-full capacity cophase supply converter C_PNegative sequence compensation current reference value i of input side ports a and b_{xneg_ref}Is equal to the output current i of the traction transformer_αAnd i_βThe phase angle is in phase with the voltage at the respective input side, x is equal to a, B.

The non-full-capacity cophase supply converter C_PThe H bridge at the side of the high-frequency transformer adopts 50 percent duty ratio open-loop control, and the non-full-capacity cophase power supply converter C_PActive power is transmitted among the input side port a, the port b and the output side port c through series resonance, and zero current switching is guaranteed.

Drawings

FIG. 1 is a schematic circuit diagram of a non-full capacity pass-through in-phase power supply apparatus of the present invention;

FIG. 2 is a schematic diagram of the internal circuit of the non-full capacity pass-through in-phase power converter of the present invention;

FIG. 3 shows simulated catenary voltage and converter output voltage waveforms;

fig. 4 shows the net-side current waveforms obtained by simulation before and after the control method of the present invention is applied.

Detailed Description

The invention is further described below with reference to the accompanying drawings and the detailed description.

Fig. 1 is a schematic circuit diagram of a non-full capacity pass-through in-phase power supply device according to the present invention. As shown in FIG. 1, the non-full-capacity pass-through in-phase power supply device of the present invention comprises a Scott traction transformer T_tracAnd a non-full-capacity cophase supply converter C_P. Scott traction transformer T_tracIs connected to the three-phase network, a Scott traction transformer T_tracOutput side and non-full capacity cophase supply converter C_PIs connected with the input side of the converter C_pOutput side and ScoAnd α phase and β phase outputs of the tt transformer are connected in series and then connected to a contact net.

Scott traction transformer T_tracThree terminals a, b and c at the input side, and α and n at the output side₁，β，n₂. Non-full capacity cophase supply converter C_PHas a terminal of an input side port a₁、a₂The terminal of port b is b₁、b₂The terminal of the output side port c is c₁、c₂. The connection mode is as follows:

scott traction transformer T_tracThree terminals a, b and c at the input side are respectively connected with A, B, C three phases of a three-phase power grid, and a Scott traction transformer T_tracInput terminal α and non-full capacity cophase supply current transformer C_PTerminal a of input side port a₁Connecting, Scott traction transformer T_tracOutput side terminal n₁Non-full capacity cophase power supply converter C_PTerminal a of input side port a₂Connecting, Scott traction transformer T_tracOutput terminal β and non-full capacity in-phase power supply converter C_PTerminal b of input side port b₁Connecting, Scott traction transformer T_tracOutput side terminal n₂Non-full capacity cophase power supply converter C_PTerminal b of input side port b₂And (4) connecting. Scott traction transformer T_tracThe output side terminal α is connected with a contact net, and the Scott traction transformer T_tracOutput side terminal n₁And Scott traction transformer T_tracOutput side terminal β, Scott traction transformer T_tracOutput side terminal n₂Non-full capacity cophase power supply converter C_PTerminal c of output side port c₂Connected, non-full capacity cophase supply current transformer C_PTerminal c of output side port c₁Is connected with the steel rail.

FIG. 2 shows a non-full-capacity through type cophase supply current transformer C_PSchematic diagram of the internal circuit. As shown in FIG. 2, the non-full capacity through-type cophase supply current transformer is composed of a switch S_x1-8D.C. capacitor C_xAC filter inductance L_xResonant capacitor C_rxAnd high frequencyTransformer T_HFAnd (4) forming. Switch S_x1And switch S_x2Has a common connection point of J_x1Switch S_x3And switch S_x4Has a common connection point of J_x2Switch S_x5And switch S_x6Has a common connection point of J_x3Switch S_x7And switch S_x8Has a common connection point of J_x4. Switch S_x1、S_x3、S_x5、S_x7Collector and capacitor C_xIs connected with the positive pole of the switch S_x2、S_x4、S_x6、S_x8Emitter and capacitor C_xAre connected with each other. One end of filter inductor Lx and alternating current port x₁The other end of the filter inductor Lx is connected with the common connection point J_x1Are connected. Resonant capacitor C_rxIs connected with the common connection point J_x3Connected, resonant capacitor C_rxAnd the other end of the high-frequency transformer T_HFTerminal y of_xAre connected. High-frequency transformer T_HFTerminal x of_xRespectively with common connection point J_x4And the subscript x is a, b, c. Filter capacitor C_fAre respectively connected with an AC output terminal c₁And c₂。

The control method of the non-full-capacity through type in-phase power supply device comprises the following steps:

the non-full-capacity cophase supply converter C_PThe output side port c adopts output voltage closed-loop control. Non-full capacity cophase supply converter C_PThe input side port a and the port b adopt current closed loop control. The method comprises the following specific steps:

non-full capacity cophase supply converter C_PThe output side port c adopts output voltage closed-loop control. Reference voltage given value u_{inv_ref}By the required catenary voltage u_catenaryAnd Scott traction transformer T_tracα phase and β phase series connection output voltage u_αn1+u_βn2The subtraction results, i.e.:

u_{inv_ref}＝u_catenary-(u_αn1+u_βn2)

wherein u is_αn1For Scott transformer T_tracα phaseOutput voltage, i.e. Scott traction transformer T_tracOutput side terminal α and terminal n₁Voltage between u_βn2For Scott transformer T_tracβ -phase output voltage, i.e. Scott traction transformer T_tracOutput side terminal β and terminal n₂Voltage between them, draw Scott the transformer T_tracThe α and β phase outputs are connected in series, i.e. terminals n1 and β shown in fig. 1 are connected, resulting in a series output voltage u_αn1+u_βn2；u_αn1-u_βn2Is 1/k of the contact network voltage, and k is an integer larger than 1.

Non-full capacity cophase supply converter C_PThe voltage of the port C is equal to (k-1)/k non-full-capacity in-phase power supply converter C of the voltage of a contact network_PThe current of the port C is equal to the load current, and the non-full capacity cophase supply converter C_PThe power of the output port C is (k-1)/k of the load power, namely, the non-full-capacity cophase supply converter C_PIs (k-1)/k of the load capacity, k being an integer greater than 1.

The non-full-capacity cophase supply converter C_PThe input side port a and the port b adopt current closed loop control. Non-full capacity cophase supply converter C_PCurrent i input to port a_AAnd current i of input side port b_BReference value i of_xrefThe reactive compensation current reference value and the negative sequence compensation current reference value are superposed to form the reactive compensation current reference value:

i_xref＝i_{xp_ref}+i_{xq_ref}+i_{xneg_ref}(x＝A，B)

wherein i_{xp_ref}Is the active current reference value, i_{xq_ref}Is a reactive compensation current reference value, i_{xneg_ref}Is a negative sequence compensation current reference value; x is A, i_xref＝i_ArefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port a_{xp_ref}＝i_{Ap_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port a_{xq_ref}＝i_{Aq_ref}For non-full capacity cophase supply converters C_PInput side porta reactive compensation current reference value, i_{xneg_ref}＝i_{Aneg_ref}For non-full capacity cophase supply converters C_PInputting a negative sequence compensation current reference value of the side port a; x is B, i_xref＝i_BrefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port b_{xp_ref}＝i_{Bp_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port b_{xq_ref}＝i_{Bq_ref}For non-full capacity cophase supply converters C_PReactive compensation current reference value of input side port b, i_{xneg_ref＝}i_{Bneg_ref}For non-full capacity cophase supply converters C_PThe negative sequence of input side port b compensates the current reference value.

Non-full capacity cophase supply converter C_PThe active power part adopts voltage and current double closed loop control, namely capacitor voltage C_aNon-full capacity co-phase supply converter C as voltage outer loop_PCurrent i at input side port a and port b_A、i_BAs the current inner loop of its input side port a and port b, respectively. Non-full capacity cophase supply converter C_PInput side port a and port b active current reference value i_{xp_ref}Are given by the output of the outer loop of this voltage, the active current reference value i_{xp_ref}Phase angle of (C) is equal to non-full capacity cophase supply converter_PThe phase angle of the input side voltage of (1).

Non-full capacity cophase supply converter C_PReactive compensation current reference value i of input side port a and port b_{xq_ref}Is equal to the load current i_loadIn-phase power supply converter C relative to non-full capacity_PReactive current amplitude of input side voltage, reactive compensation current reference value i of port a_{Aq_ref}The phase angle of the voltage of α is advanced by 90 degrees, and the reactive compensation current reference value i of the port b_{Bq_ref}The phase angle of (d) lags by β phase voltage u_βn290°。

Non-full capacity cophase supply converter C_PNegative sequence compensation current reference value i of input side port a and port b_{xneg_ref}Is equal to Scott traction transformer T_tracOutput current i_αAnd i_βThe phase angle is in phase with the voltage at the respective input side, x is equal to a, B.

Non-full capacity cophase supply converter C_PThe H bridge at the side of the high-frequency transformer adopts 50 percent duty ratio open-loop control, and the non-full-capacity cophase power supply converter C_PActive power is transmitted among the input side port a, the port b and the output side port c through series resonance, and zero current switching is guaranteed.

The simulation model parameters of the device for the 27.5kV alternating-current contact net built by the invention are as follows:

fig. 3 and 4 show the results of computer simulations using the non-capacitive through-type non-inverting device of the present invention. In fig. 3, ucatenary is a voltage waveform of the contact network, and uinv is a voltage waveform of the converter output. According to simulation results, the output voltage uinv of the converter is half of the voltage ucatenary of the contact network, the output current of the converter is the same as the load current, the ratio of the capacity of the converter to the load capacity is 1:2, and non-full-capacity operation of the converter is achieved. In fig. 4, ia, ib and ic are three-phase currents of a power grid a, B and C respectively, and are controlled according to the control method of the invention at the time of 0.1 second, and it can be seen from simulation results that a large amount of reactive power and negative sequence current exist on the power grid side before the time of 0.1 s.

Claims (6)

1. A non-full-capacity through-type in-phase power supply device is characterized in that: the non-full-capacity through type in-phase power supply device is composed of a Scott traction transformer T_tracAnd a non-full-capacity cophase supply converter C_PForming; non-full capacity cophase supply converter C_PThe inside is electrically isolated from the input side and the output side through a high-frequency transformer; scott traction transformer T_tracThree terminals a, b and c at the input side, and α and n at the output side₁、β、n₂Non-full capacity cophase supply current transformer C_PHas a terminal of an input side port a₁、a₂The terminal of the input side port b is b₁、b₂The terminal of the output side port c is c₁、c₂(ii) a Scott traction transformer T_tracThree terminals a, b and c at the input side are respectively connected with A, B, C three phases of a three-phase power grid, and a Scott traction transformer T_tracOutput side terminal α and non-full capacity in-phase power supply converter C_PTerminal a of input side port a₁Connecting, Scott traction transformer T_tracOutput side terminal n₁Non-full capacity cophase power supply converter C_PTerminal a of input side port a₂Connecting, Scott traction transformer T_tracOutput terminal β and non-full capacity in-phase power supply converter C_PTerminal b of input side port b₁Connecting, Scott traction transformer T_tracOutput side terminal n₂Non-full capacity cophase power supply converter C_PTerminal b of input side port b₂Connecting; scott traction transformer T_tracNon-full capacity cophase supply converter C with output sides α and β connected in series_PThe ports c of the output side are connected in series to supply power for a contact net, namely a Scott traction transformer T_tracThe output side terminal α is connected with a contact net, and the Scott traction transformer T_tracOutput side terminal n of₁And Scott traction transformer T_tracOutput side terminal β, Scott traction transformer T_tracOutput side terminal n of₂Non-full capacity cophase power supply converter C_PTerminal c of output side port c₂Connected, non-full capacity cophase supply current transformer C_PTerminal c of output side port c₁Connecting with a steel rail; u. of_αn1For Scott transformer T_tracα -phase output voltage, i.e. Scott traction transformer T_tracOutput side terminal α and terminal n₁Voltage between u_βn2For Scott transformer T_tracβ -phase output voltage, i.e. Scott traction transformer T_tracOutput side terminal β and terminal n₂Voltage between them, draw Scott the transformer T_tracThe outputs of the α phases and the β phase are connected in series, i.e. the terminals n1 and β are connected, to obtain a series output voltage u_αn1+u_βn2。

2. The non-full-capacity through-type in-phase power supply device according to claim 1, wherein: the H bridge at the high-frequency transformer side of the non-full-capacity cophase supply converter is controlled by adopting 50 percent duty ratio open loop, and the non-full-capacity cophase supply converter C_PActive power is transmitted among the input side port a, the port b and the output side port c through series resonance, and zero current switching is guaranteed.

3. The method for controlling a non-full-capacity through-type in-phase power feeding device according to claim 1, wherein: the non-full-capacity cophase supply converter C_PThe output side port C adopts output voltage closed-loop control, and the non-full-capacity cophase power supply converter C_PThe input side port a and the port b adopt current closed loop control.

4. The method for controlling a non-full-capacity through-type in-phase power supply device according to claim 3, wherein: the non-full-capacity cophase supply converter C_PThe output side port c adopts output voltage closed-loop control, and the reference voltage given value u_{inv_ref}The value of (A) is determined by the required catenary voltage u_catenaryAnd Scott traction transformer T_tracOutput voltage u formed by connecting α phases and β phases in series_αn1+u_βn2The subtraction results, i.e.:

u_{inv_ref}＝u_catenary-(u_αn1+u_βn2)

wherein u is_αn1+u_βn2Is 1/k of the voltage of the contact network, and k is an integer more than 1;

current transformer C_PThe voltage of the port C at the output side is equal to (k-1)/k of the voltage of the overhead line system, and the converter C_PCurrent of output port c is equal to load current, current transformerC_PThe power of the output port C is (k-1)/k of the load power, namely a converter C_PThe output side capacity is (k-1)/k of the load capacity.

5. The method for controlling a non-full-capacity through-type in-phase power supply device according to claim 3, wherein: the port a and the port b of the input side of the non-full-capacity cophase power supply converter are controlled by adopting a current closed loop; non-full capacity cophase supply converter C_PCurrent i input to port a_AAnd current i of port b_BThe reference value is formed by superposing an active current reference value, a reactive compensation current reference value and a negative sequence compensation current reference value:

i_xref＝i_{xp_ref}+i_{xq_ref}+i_{xneg_ref}(x＝A，B)

wherein i_{xp_ref}Is the active current reference value, i_{xq_ref}Is a reactive compensation current reference value, i_{xneg_ref}Is a negative sequence compensation current reference value, x ═ A, i_xref＝i_ArefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port a_{xp_ref}＝i_{Ap_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port a_{xq_ref}＝i_{Aq_ref}For non-full capacity cophase supply converters C_PReactive compensation current reference value of input side port a, i_{xneg_ref}＝i_{Aneg_ref}For non-full capacity cophase supply converters C_PInputting a negative sequence compensation current reference value of the side port a; x is B, i_xref＝i_BrefFor non-full capacity cophase supply converters C_PCurrent reference value, i, of input side port b_{xp_ref}＝i_{Bp_ref}For non-full capacity cophase supply converters C_PActive current reference value, i, of input side port b_{xq_ref}＝i_{Bq_ref}For non-full capacity cophase supply converters C_PReactive compensation current reference value of input side port b, i_{xneg_ref}＝i_{Bneg_ref}For non-full capacity cophase supply converters C_PNegative sequence compensation of input side port bA current reference value.

6. The method for controlling a non-full-capacity through-type in-phase power supply device according to claim 3, wherein: non-full capacity cophase supply converter C_PThe active power part adopts voltage and current double closed loop control, namely capacitor voltage C_aAs voltage outer loop, current i_A、i_BConverter C for respectively supplying non-full-capacity cophase power_PA current inner loop of input side port a and port b; non-full capacity cophase supply converter C_PInput side port a and port b active current reference value i_{xp_ref}Is given by the output of the voltage outer loop, the active current reference value i_{xp_ref}Phase angle of (C) is equal to non-full capacity cophase supply converter_PThe phase angle of the input side voltage;

reactive compensation current reference value i_{xq_ref}Is equal to the load current i_loadReactive compensation current reference i of α phases with respect to the reactive current amplitude of the input side voltage_{Aq_ref}The phase angle of the phase angle is advanced by α phase voltage 90 degrees and the reactive compensation current reference value i of β phase_{Bq_ref}The phase angle of (d) lags by β phase voltage u_βn290°；

Negative sequence compensation current reference value i_{xneg_ref}Is equal to Scott traction transformer T_tracOutput current i_αAnd i_βHalf of the amplitude difference of the medium active current, and the phase angle is in the same phase with the voltage of each input side; x is A, i_{xneg_ref}＝i_{Aneg_ref}For non-full capacity cophase supply converters C_PNegative sequence compensation current reference value of input side port a, x ═ B, i_{xneg_ref}＝i_{Bneg_ref}Converter C for non-full capacity cophase supply_PThe negative sequence of input side port b compensates the current reference value.

Images