CN216252551U - Alternating current-direct current electric energy conversion system - Google Patents
Alternating current-direct current electric energy conversion system Download PDFInfo
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- CN216252551U CN216252551U CN202121830575.8U CN202121830575U CN216252551U CN 216252551 U CN216252551 U CN 216252551U CN 202121830575 U CN202121830575 U CN 202121830575U CN 216252551 U CN216252551 U CN 216252551U
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Abstract
The embodiment of the utility model discloses an alternating current-direct current electric energy conversion system, which comprises: the phase-shifting transformer comprises N output windings, each output winding is used for outputting one path of alternating current, and the phase-shifting angles of the alternating current output by any two output windings are different; detection means for detecting a current value of the alternating current output from each of the output windings; the control device is used for determining the balance current value required to be output according to the current values of the alternating current output by the N groups of output windings; the rectifying devices are N groups and are used for converting alternating current output by each output winding into direct current and adjusting the output mode of the rectifying devices according to the balance current value so as to enable the output current to be the balance current value. The alternating current-direct current electric energy conversion system provided by the embodiment of the utility model can solve the problem that the improved power factor of the phase-shifting transformer is limited due to unbalanced secondary output current of the phase-shifting transformer.
Description
Technical Field
The present invention relates to, but is not limited to, the field of dc power supplies, and more particularly, to an ac-dc power conversion system.
Background
The direct current power supply provides adjustable voltage and direct current electric energy meeting certain performance index requirements for electric equipment, and is widely applied to various industries, and typical application occasions comprise data centers, electric vehicle charging stations, various industrial equipment and the like. The DC power supply usually includes an AC-DC (alternating current-direct current) conversion part for converting the AC power of the power grid into the DC power, and as the application capacity of the DC power supply increases, the influence on the power factor and the harmonic of the power grid on the input side becomes more and more serious. To reduce the adverse effects on the grid, new AC-DC power conversion systems are needed to improve the system power factor and reduce the harmonic pollution to the grid while maintaining high conversion efficiency and device economy.
Fig. 1 shows an AC-DC power converter provided by the prior art, in which, as shown in fig. 1, a phase-shifting transformer in the AC-DC power converter has at least one secondary winding, and the secondary windings are arranged into at least one winding unit, so that different phase-shifting angles can be provided according to the actual number of windings in each winding unit, thereby reducing harmonic components in current and increasing the power factor of the system, and balancing the secondary output current of the transformer through load-switching load.
However, the problem of unbalanced output current of the secondary side of each transformer is solved by redundant load switching, the balancing means is complex, the implementation is difficult, and the operation cost is increased.
SUMMERY OF THE UTILITY MODEL
An embodiment of the present invention provides an ac-dc power conversion system, including: the device comprises a phase-shifting transformer, a detection device, a control device and a rectifying device, wherein the phase-shifting transformer is used for outputting N paths of alternating current respectively from three-phase alternating current of a power grid through N output windings, the detection device is used for detecting the current value of the alternating current output by each output winding, the control device is used for determining the balanced current value required to be output according to the current values of the alternating current output by N groups of output windings, and the rectifying device is used for converting the alternating current output by each output winding into direct current and adjusting the output mode of the rectifying device according to the balanced current value so as to enable the output current to be the balanced current value;
the phase-shifting transformer comprises N output windings, wherein N is more than or equal to 2, and the phase-shifting angles of alternating currents output by any two output windings are different;
the rectifying devices are N groups, each output winding of the phase-shifting transformer is respectively connected with one group of rectifying devices, and each group of rectifying devices is respectively connected with the control device;
the detection device is arranged on an output loop of the phase-shifting transformer.
In one example, each group of rectifying devices comprises a control module and M rectifying modules, wherein the control module is used for acquiring an equalization current value output by the control device and outputting a control signal according to the equalization current value, and M is a positive integer;
the control module is respectively connected with one output winding and the control device, the control signal is used for respectively controlling the output mode of each rectifying module, so that alternating current output by one output winding is converted into direct current through one group of rectifying devices, and the current output by each group of rectifying devices is the balanced current value.
In one example, each rectifier module comprises a rectifier switch for switching on or off according to the control signal, and the rectifier switch comprises at least two power switches;
the number of the power switches which are switched on or off is different, and the output modes of the rectifier modules are different.
In one example, the power switch includes: and (6) silicon controlled rectifier.
In one example, the rectifier module includes: a semi-controlled bridge rectification circuit or a fully-controlled bridge rectification circuit.
In one example, each set of rectifying devices further includes: and the driving module is used for driving the power switch in each rectifying module to be switched on or switched off according to the control signal output by the control module, and is arranged between the control module and the M rectifying modules.
In one example, the detection apparatus includes: the current detection module is used for detecting the current value of the alternating current output by each output winding;
the number of the current detection modules is N, and the N current detection modules are respectively arranged at the output ports of the N output windings.
In one example, the detection apparatus further includes: the voltage detection module is used for detecting the voltage value of the alternating current output by each output winding;
the number of the voltage detection modules is N, and the N voltage detection modules are respectively arranged at the output ports of the N output windings.
In one example, N sets of rectifying devices are coupled in parallel to a common dc bus.
In one example, each output winding is connected in an edgewise delta manner.
Compared with the prior art, the alternating current-direct current electric energy conversion system provided by at least one embodiment of the utility model has the following beneficial effects: the current-sharing control strategy of the control device is used for controlling the rectifying device to realize current sharing of the current value of the alternating current output by each output winding, so that the current output by each output winding is balanced, the problem that the power factor of the phase-shifting transformer is limited due to unbalanced secondary output power (current) of the phase-shifting transformer is solved, the efficiency of the direct-current power supply is improved, and the balancing strategy mode is simple, low in cost and high in implementation.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
FIG. 1 is an AC-DC power converter provided in a prior art arrangement;
fig. 2 is a block diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention;
fig. 3 is an architecture diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention;
fig. 4 is a block diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention;
fig. 5 is an architecture diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a half-bridge rectifier circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fully controlled bridge rectifier circuit according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for implementing ac-dc conversion by an ac-dc power conversion system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 2 is a block diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention, and fig. 3 is an architecture diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention, as shown in fig. 2 and fig. 3, the ac-dc power conversion system according to an exemplary embodiment of the present invention may include: the device comprises a phase-shifting transformer 21 for outputting the three-phase alternating current of the power grid to N alternating currents through N output windings, a detection device 22 for detecting the current value of the alternating current output by each output winding, a control device 23 for determining the balance current value required to be output according to the current values of the alternating currents output by the N groups of output windings, and a rectifying device 24 for converting the alternating current output by each output winding into direct current and adjusting the output mode of the rectifying device according to the balance current value so as to enable the output current to be the balance current value.
The phase-shifting transformer can comprise N output windings, N is more than or equal to 2, each output winding is used for outputting one path of alternating current, and the phase-shifting angles of the alternating current output by any two output windings are different.
In this embodiment, phase shifting transformerThe device can have an input winding and at least two output windings (which can be called secondary windings), and the alternating current of the power grid is received by the input winding and is input into the voltage VinAnd voltage dropping for outputting a plurality of alternating currents for the plurality of three-phase output windings, wherein the alternating currents output by each output winding (such as alternating voltages or alternating currents) have phase-shifted angles relative to the alternating currents output by each other output winding.
In this embodiment, the phase-shifting transformer may be provided with a plurality of secondary windings, each of which is provided as an output winding as an output unit of the alternating current, and may provide different phase-shifting angles according to the actual number of windings in each output winding, so as to reduce harmonic components in the alternating current and increase the power factor of the system. And after the secondary side (secondary side) of the phase-shifting transformer is divided into a plurality of output windings, the direct current power output by each path is greatly reduced, the parameter requirements of an AC-DC conversion system on components in the circuit can be remarkably reduced, the requirement of a power grid can be met without independently designing a power factor correction circuit, and the cost is saved.
In one example, the input winding and the output winding of the phase-shifting transformer may be a three-phase input winding and a three-phase output winding, respectively, to receive three-phase alternating currents R, S and T of the power grid through the three-phase input winding of the phase-shifting transformer and to output the three-phase alternating currents through the three-phase output winding of the phase-shifting transformer.
The phase-shifting transformer is a device specially used for providing a multiphase rectification power supply for a medium-high voltage frequency converter, and in one example, each output winding is connected in a flanged triangle mode.
In this embodiment, the phase-shifting transformer may adopt an edge-extended triangular phase-shifting principle, and may form a rectifier transformer with equivalent phase numbers of 9, 12, 15, 18, 24, and 27 phases by using a plurality of different phase-shifting angle secondary windings. The primary side (input winding side) of the phase-shifting transformer is directly connected into a high-voltage power grid, the secondary side (output winding side) of the phase-shifting transformer is provided with a plurality of three-phase windings, the low-voltage three-phase windings on the secondary side of the phase-shifting transformer can be connected in an extended triangle manner according to 0 degree, theta degree, … degree, 60-theta degree and the like, and the phase-shifting angle of the line voltage of each low-voltage three-phase winding relative to the corresponding winding is represented at the same time. Wherein theta represents a phase shift angle, and theta is more than 0 DEG and less than 60 deg.
The detection device is arranged on an output loop of the phase-shifting transformer and is used for detecting the current value of the alternating current output by each output winding.
In this embodiment, a detection device may be disposed on an output winding loop (e.g., at an output port of an output winding) of the phase-shifting transformer, and the current value of the alternating current output by each output winding is detected by the detection device, so as to provide the current value of each output winding for current equalization of the control device in the following embodiments.
In one example, the detection means may comprise: and the current detection module is used for detecting the current value of the alternating current output by each output winding. In this embodiment, the current value of the alternating current output by each output winding may be directly obtained by the current detection module.
In an alternative embodiment, the detection means may comprise: and a voltage detection module for detecting a voltage value of the alternating current output by each output winding, wherein the voltage value of the alternating current detected by the voltage detection module can be converted into a current value by the detection device, or can be converted into a current value by the control device of the following embodiment. The implementation principle of converting the voltage value into the current value is the same as that in the prior art, and this embodiment is not limited and described herein.
In one example, as shown in fig. 3, the number of the current detection modules may be N, and the N current detection modules are respectively disposed at the output ports of the N output windings. In this embodiment, a current detection module may be disposed at an output port of each output winding, and the current values of the alternating currents of the N output windings are respectively detected by the N current detection modules.
In an example, the number of the voltage detection modules may be N, and the N voltage detection modules are respectively disposed at the output ports of the N output windings. In this embodiment, a voltage detection module may be disposed at an output port of each output winding, and the voltage values of the alternating currents of the N output windings are respectively detected by the N voltage detection modules.
In an example, the detecting means may further include: the temperature sensor is used for acquiring the temperature on an output loop (such as at an output port) of each output winding, and the detected temperature can be used for controlling the output frequency of the rectifying device (such as the switching frequency of a power switch in the rectifying module) according to the temperature by the control device, and the like.
And the control device is used for determining the balance current value required to be output according to the current values of the alternating currents output by the N groups of output windings so as to perform current sharing control on the alternating currents output by each output winding, and when the balance current value is determined, the maximum value, the minimum value, the average value or the weighted average value of the detected current values can be used as the balance current value. Wherein, the maximum value, the minimum value, the average value or the weighted average value of the current value is determined as the existing algorithm.
In practical application, when the number of the secondary side output windings of the phase-shifting transformer is multiple at present, because the current design and manufacturing process cannot ensure the impedance parameters of the secondary side output windings of the phase-shifting transformer to be completely consistent, the output currents of the output windings are inevitably unbalanced due to the difference and the change of the operation working conditions, so that the primary side neutral line of the phase-shifting transformer injects direct current into the phase-shifting transformer in a variable manner, the operation of the phase-shifting transformer is influenced, the power factor of the phase-shifting transformer is reduced, and the harmonic waves and the loss are increased. That is, because the impedance parameters of the secondary side output windings of the current phase-shifting transformer are not completely consistent, the problem of unbalanced output current of each output winding exists, and the power factor of the phase-shifting transformer is limited.
In this embodiment, the control device may obtain a current value of the alternating current output by each output winding through the detection device, determine an equilibrium current value required to be output according to the current value of the alternating current output by each output winding and a preset current sharing control policy, where the equilibrium current value is a current value required to be output by each output winding determined according to the current sharing control policy, so that the control device controls the rectifying device according to the equilibrium current value, and implement current sharing of the current values of the alternating currents output by each output winding through the rectifying device, so as to perform current sharing control on the current values of the alternating currents output by each output winding, so that the currents output by each output winding are balanced.
In this embodiment, the control device may determine the balanced current value required to be output by each output winding by using a current-sharing control strategy, and then control the rectifying devices to make the currents output by each group of rectifying devices be the balanced current value, that is, adjust the output currents of the rectifying devices to balance the output currents of each output winding, so as to balance (or balance) the currents output by each output winding.
In this embodiment, the implementation principle of the current sharing control policy is as follows: and correspondingly increasing/decreasing the power of the rectifying device connected with each path according to the detected current value of each path, so that the output current of each path tends to be the same.
For example, when a plurality of output windings of the phase-shift transformer output ac power due to differences in the respective output windings, the current value of ac power output by some output windings is 8 amperes (a), and the current value of ac power output by some output windings is 10 amperes (a). In this embodiment, the current value output by each output winding and the preset current sharing control strategy may be used to determine the balancing current value required to be output by each path, for example, the preset current sharing control strategy is an averaging value, the averaging value of the current values output by each N groups of output windings is obtained, and the balancing current value required to be output by each path is 10A, so that the output mode of the rectifying device is controlled, and the output current of each group of rectifying device is 10A, thereby realizing the output current balance of each output winding.
In an example, the current sharing control strategies may be overlapped, where the overlapping of the current sharing control strategies refers to determining calculation or determination of other performance indexes when determining the equalization current value, for example, determining the equalization current value and determining the switching frequency of the bridge arm of each of the rectifying devices, and by using one control instruction, the switching frequency of the bridge arm of each of the rectifying devices may be controlled while achieving output of current sharing control, so as to improve control efficiency.
In one example, when the detection device includes a voltage detection module, the control device may further perform voltage stabilization control according to a voltage value of the alternating current detected by the voltage detection module.
The rectifying devices can be N groups, each output winding of the phase-shifting transformer can be respectively connected with one group of rectifying devices, and each group of rectifying devices can be respectively connected with the control device; and the rectifying device is used for converting the alternating current output by each output winding into direct current and adjusting the output mode of the rectifying device according to the balance current value so as to enable the output current to be the balance current value.
In this embodiment, the output currents of the secondary sides of the N sets of phase-shifting transformers can be controlled by the rectifier device to equalize the output currents of the phase-shifting transformers. Specifically, N sets of rectifying devices may be provided, each output winding is correspondingly connected to one set of rectifying device, and the current output by each output winding may be balanced by one set of rectifying devices.
That is, a current-sharing control strategy may be added to the control device to control the output mode of the rectifying devices so that the current value output by each group of rectifying devices is equal to the balance current value, and the alternating current output by each output winding is balanced after passing through the rectifying devices, wherein balance means that the current values of the alternating current output by each output winding are the same.
Each group of rectifying devices may include a plurality of power switches, and the output mode of the rectifying devices may be controlled by controlling the on or off of the plurality of power switches. The number of the power switches which are switched on or switched off is different, the output modes of the rectifying devices are different, and the current output by the rectifying devices is different in magnitude.
In this embodiment, a plurality of dc outputs corresponding to the N groups of rectifying devices may be collected on a common dc bus to provide dc power for other loads.
In one example, the output terminals of the N sets of rectifying devices may be connected in parallel to provide a dc output, i.e., the N sets of rectifying devices may be connected in parallel to the common dc bus, so as to increase the ripple frequency in the voltage and further reduce the ripple amplitude.
In one example, the output ends of the N groups of rectifying devices may be connected in series to provide a dc output, that is, the N groups of rectifying devices may be connected in series to a common dc bus, and different output ends may be used to provide different dc outputs, so as to meet the charging requirements of various electronic devices.
According to the alternating current-direct current electric energy conversion system provided by the embodiment of the utility model, the control device can obtain the current value of the alternating current output by each output winding through the detection device, and determine the balance current value required to be output according to the current value of the alternating current output by each output winding and a preset current-sharing control strategy so as to control the current value output by each rectifying device to be the balance current value. The current-sharing control strategy of the control device is used for controlling the rectifying device to achieve current sharing of current values of alternating current output by the output windings, so that the currents output by the output windings are balanced. The problem that the power factor of the phase-shifting transformer is limited due to unbalanced secondary output power (current) of the phase-shifting transformer is solved, the efficiency of a direct-current power supply is improved, and the method is simple in balancing strategy mode, low in cost and high in implementation performance.
In an exemplary embodiment of the present invention, fig. 4 is a block diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention, fig. 5 is an architecture diagram of an ac-dc power conversion system according to an exemplary embodiment of the present invention, as shown in fig. 4 and 5, each group of rectifying devices may include a control module 241 for obtaining an equalizing current value output by the control device and outputting a control signal according to the equalizing current value, and M rectifying modules 242, where M is a positive integer; the control module can be connected to an output winding and to the control device.
The control module is used for obtaining the balance current value output by the control device and outputting a control signal according to the balance current value, the control signal is used for respectively controlling the output mode of each rectifying module, so that alternating current output by one output winding is converted into direct current through one group of rectifying devices, and the current output by each group of rectifying devices is the balance current value.
In this embodiment, each set of rectifying devices may include a control module and M rectifying modules connected in parallel, where an input/output (I/O) port of the control module may be electrically connected to an output terminal of the control device, and outputs a corresponding control signal according to the equalizing current value output by the control device. Each rectifying module is used for receiving the control signal output by the control module and adjusting the output mode thereof according to the control signal, such as conducting or shutting off the power switch electrically, so that the output current value of each rectifying module is the equilibrium current value.
In this embodiment, each set of rectifying device may include M rectifying modules, and the N × M rectifying modules are connected in parallel to the common dc bus, so as to provide a stable and efficient dc source for a plurality of dc loads.
As shown in fig. 5, N sets of rectifying devices may be connected in parallel to a common dc bus.
The control device may include a single chip microcomputer (CPU), and the control device is used as a global control device and is mainly used to obtain current values output by all output windings and determine a required balance current value according to a preset current sharing control strategy.
The control module may include a single chip microcomputer (CPU), and the control module is used as a local control device in each group of the rectifying devices, and is mainly used for controlling output modes of the M rectifying modules connected thereto according to the equalizing current value, so that the current values output by the M rectifying modules are the equalizing current value.
In this embodiment, the control device for determining the equalizing current value is separated from the control module for controlling the output mode of the rectifying module, so that modularization of the control device is realized, functional independence is stronger, and more individual requirements can be met.
In one example, the control modules in each group of rectifying devices may be integrated in the control device, that is, only one global control device is provided, and the control modules are not provided in each group of rectifying devices, and the output modes of the rectifying modules are controlled by the global control device.
In an exemplary embodiment of the present invention, each of the rectifying modules may include a rectifying switch for being turned on or off according to a control signal, the rectifying switch including at least two power switches; the control signal controls the output mode of each rectifier module respectively, and may include:
the control signal respectively controls the on-off of a power switch in a rectifier switch of each rectifier module so as to control the output mode of each rectifier module; the number of the power switches which are switched on or off is different, and the output modes of the rectifier modules are different.
In this embodiment, each of the rectifier modules may include a plurality of power switches, and the output mode of the rectifier module is controlled by controlling the on/off of the power switches. The output modes of the rectifier modules are different, and the current output by the rectifier modules is different in magnitude.
In one example, a power switch may include: and (6) silicon controlled rectifier. In this embodiment, a Silicon Controlled Rectifier (SCR) may be used as a power switch in the Rectifier module, and the SCR is a high-power electrical component, also called a thyristor. The controllable silicon has the advantages of small volume, high efficiency, long service life and the like, and can realize the control of high-power equipment by using a low-power control.
In one example, the rectification module may include: half accuse bridge rectifier circuit. Fig. 6 is a schematic structural diagram of a half-controlled bridge rectifier circuit according to an embodiment of the present invention, and as shown in fig. 6, the half-controlled bridge rectifier circuit may include: and the three thyristors G positioned at the upper half bridge control the output mode of the rectification module by controlling the conduction or the disconnection of the three thyristors or respectively controlling the conduction angles of the three thyristors.
As shown in fig. 6, the half-bridge rectifier circuit may further include: the specific structure and implementation principle of the inductor L, the capacitor C, and the diode D are the same as those in the prior art, and this embodiment is not limited and described herein.
In one example, the rectification module may include: fully controlled bridge rectifier circuit. Fig. 7 is a schematic structural diagram of a fully controlled bridge rectifier circuit according to an embodiment of the present invention, and as shown in fig. 7, the fully controlled bridge rectifier circuit may include: the three thyristors G1 in the upper half bridge and the three thyristors G2 in the lower half bridge control the output mode of the rectification module by controlling the on or off of the six thyristors or respectively controlling the conduction angles of the six thyristors.
As shown in fig. 7, the fully controlled bridge rectifier circuit may further include: the specific structure and implementation principle of the inductor L, the capacitor C, and the diode D are the same as those in the prior art, and this embodiment is not limited and described herein.
In an exemplary embodiment of the present invention, each group of rectifying devices may further include a driving module for driving the power switch in each rectifying module to be turned on or off according to the control signal output by the control module, and the driving module is disposed between the control module and the M rectifying modules.
In this embodiment, a driving module may be disposed between the control module and the M rectifier modules, an input end of the driving module is electrically connected to the control end of the control module, an output end of the driving module is electrically connected to an input end of each rectifier module, and the driving module is configured to receive a control signal output by the control end of the control module and drive the power switch in each rectifier module to be electrically turned on or off according to the control signal.
An embodiment of the present invention may also provide an ac-dc conversion method based on the ac-dc power conversion system shown in any one of the above embodiments, where fig. 8 is a flowchart of an ac-dc conversion method implemented by the ac-dc power conversion system provided in an embodiment of the present invention, and as shown in fig. 8, an execution subject of the embodiment of the present invention is the control device shown in any one of the above embodiments, where the ac-dc conversion method may include:
s801: and acquiring the current value of the alternating current output by each output winding of the phase-shifting transformer.
The phase-shifting transformer comprises N output windings, N is more than or equal to 2, each output winding is used for outputting one path of alternating current, and the phase-shifting angles of the alternating current output by any two output windings are different.
S802: and determining the balance current value required to be output according to the current values of the alternating current output by the N groups of output windings and a preset current sharing control strategy.
The execution main body of the ac-dc conversion method provided by the embodiment of the present invention is the control device shown in any of the above embodiments, and the implementation principle and the implementation effect are similar, and are not described herein again.
In an exemplary embodiment of the present invention, determining a required output equalization current value according to current values of the alternating currents output by the N groups of output windings and a preset current sharing control strategy may include:
sending an equalization current value to each rectifying device so that each rectifying device adjusts the output mode of the rectifying device according to the equalization current value;
and each rectifying device outputs current after adjusting the self mode to be a balanced current value.
In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. An ac-dc power conversion system, comprising: the device comprises a phase-shifting transformer, a detection device, a control device and a rectifying device, wherein the phase-shifting transformer is used for outputting N paths of alternating current respectively from three-phase alternating current of a power grid through N output windings, the detection device is used for detecting the current value of the alternating current output by each output winding, the control device is used for determining the balanced current value required to be output according to the current values of the alternating current output by N groups of output windings, and the rectifying device is used for converting the alternating current output by each output winding into direct current and adjusting the output mode of the rectifying device according to the balanced current value so as to enable the output current to be the balanced current value;
the phase-shifting transformer comprises N output windings, wherein N is more than or equal to 2, and the phase-shifting angles of alternating currents output by any two output windings are different;
the rectifying devices are N groups, each output winding of the phase-shifting transformer is respectively connected with one group of rectifying devices, and each group of rectifying devices is respectively connected with the control device;
the detection device is arranged on an output loop of the phase-shifting transformer.
2. The system according to claim 1, wherein each group of rectifying devices comprises a control module for obtaining the equalizing current value outputted by the control device and outputting a control signal according to the equalizing current value, and M rectifying modules, wherein M is a positive integer;
the control module is respectively connected with one output winding and the control device, the control signal is used for respectively controlling the output mode of each rectifying module, so that alternating current output by one output winding is converted into direct current through one group of rectifying devices, and the current output by each group of rectifying devices is the balanced current value.
3. The system of claim 2, wherein each rectifier module comprises a rectifier switch for turning on or off according to the control signal, the rectifier switch comprising at least two power switches;
the number of the power switches which are switched on or off is different, and the output modes of the rectifier modules are different.
4. The system of claim 3, wherein the power switch comprises: and (6) silicon controlled rectifier.
5. The system of claim 4, wherein the rectification module comprises: a semi-controlled bridge rectification circuit or a fully-controlled bridge rectification circuit.
6. The system of claim 2, wherein each set of fairings further comprises: and the driving module is used for driving the power switch in each rectifying module to be switched on or switched off according to the control signal output by the control module, and is arranged between the control module and the M rectifying modules.
7. The system of claim 1, wherein the detection device comprises: the current detection module is used for detecting the current value of the alternating current output by each output winding;
the number of the current detection modules is N, and the N current detection modules are respectively arranged at the output ports of the N output windings.
8. The system of claim 7, wherein the detection device further comprises: the voltage detection module is used for detecting the voltage value of the alternating current output by each output winding;
the number of the voltage detection modules is N, and the N voltage detection modules are respectively arranged at the output ports of the N output windings.
9. The system of claim 1, wherein the N sets of rectification devices are coupled in parallel to a common dc bus.
10. The system of claim 1, wherein each output winding is connected in a delta connection.
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| CN113541510B (en) * | 2021-08-06 | 2024-04-19 | 清华大学 | Alternating current-direct current electric energy conversion system and method |
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