阅读说明：本技术 一种系列参数可调的变换器及其电源组件 (Series parameter adjustable converter and power supply assembly thereof ) 是由 易涛 赵林春 周威 于 2021-06-28 设计创作，主要内容包括：本发明提出一种系列参数可调的变换器及其电源组件。变换器包括输入控制级、隔离控制级、逆变控制级以及输出反馈级；输入控制级包括多个并联的高压整流电路；隔离控制级包括DC-DC变换电路以及与DC-DC变换电路连接的隔离保护电路；逆变控制级包括多个逆变控制器；基于输入控制级输入的交流网络参数,确定输入控制参数；基于输入控制级的输出信号,调节隔离控制参数；基于反馈信号以及隔离控制参数,调节逆变控制参数。本发明还提出用于所述变换器的电源组件。所述电源组件包括基准源、保护单元以及反馈单元；所述反馈单元构成变换器的所述输出反馈级。所述基准源构成变换器的所述基准源电路。本发明实现了变换器的多级参数可控调节。(The invention provides a series of parameter-adjustable converters and a power supply assembly thereof. The converter comprises an input control stage, an isolation control stage, an inversion control stage and an output feedback stage; the input control stage comprises a plurality of high-voltage rectifying circuits connected in parallel; the isolation control stage comprises a DC-DC conversion circuit and an isolation protection circuit connected with the DC-DC conversion circuit; the inversion control stage comprises a plurality of inversion controllers; determining input control parameters based on the alternating current network parameters input by the input control stage; adjusting an isolation control parameter based on an output signal of the input control stage; and adjusting the inversion control parameters based on the feedback signals and the isolation control parameters. The invention also proposes a power supply assembly for said converter. The power supply assembly comprises a reference source, a protection unit and a feedback unit; the feedback unit constitutes the output feedback stage of the converter. The reference source constitutes the reference source circuit of the converter. The invention realizes the controllable adjustment of the multilevel parameters of the converter.)

1. A series of parametrically adjustable converters, said converters comprising an input control stage, an isolation control stage, an inverter control stage and an output feedback stage;

the method is characterized in that:

the input control stage comprises a plurality of high-voltage rectifying circuits connected in parallel;

the isolation control stage comprises a DC-DC conversion circuit and an isolation protection circuit connected with the DC-DC conversion circuit;

the inversion control stage comprises a plurality of inversion controllers;

the output feedback stage is connected with the inversion control stage and the input control stage;

wherein the input control stage has input control parameters, the isolation control stage has isolation control parameters, and the inversion control stage has inversion control parameters;

the output of the inversion control stage is used as the input of a load network;

the output feedback stage detects a real-time load signal of the load network and generates a feedback signal by combining an output signal of the inversion control stage;

determining the input control parameter based on the AC network parameter input by the input control stage;

adjusting the isolation control parameter based on an output signal of the input control stage;

adjusting the inversion control parameter based on the feedback signal and the isolation control parameter.

2. A series of variable-parameter transformers according to claim 1 in which:

the input control stage is connected with an alternating current network and converts alternating current network voltage input by the alternating current network into direct current voltage;

the plurality of parallel high-voltage rectifying circuits comprise a first high-voltage rectifying circuit, a second high-voltage rectifying circuit and a third high-voltage rectifying circuit;

the first high-voltage rectifying circuit, the second high-voltage rectifying circuit and the third high-voltage rectifying circuit respectively output a first direct-current voltage, a second direct-current voltage and a third direct-current voltage;

determining one of a first direct current voltage, a second direct current voltage, or a third direct current voltage as an input signal of the isolation control stage based on the input control parameter.

3. A series of variable-parameter transformers according to claim 1 in which:

the isolation control stage also comprises a high-frequency transformer and a post-stage conversion circuit;

the isolation control stage converts an input direct current quantity signal into a high-frequency square wave, and the high-frequency square wave is converted into direct current quantity through a post-stage conversion circuit after being used as an input signal of the high-frequency transformer;

the isolation control parameter is used for determining the output power of the high-frequency transformer.

4. A series of variable-parameter transformers according to claim 1 in which:

the inversion controller performs inversion output on the input direct current quantity signal;

the inversion control parameter is used for determining an output voltage value of the inversion controller.

5. A series of variable parameter transformers according to claim 2, wherein:

the DC-DC conversion circuit includes a reference source circuit;

determining one of the first direct current voltage, the second direct current voltage, or the third direct current voltage as an input voltage of the reference source circuit based on the input control parameter.

6. A series of parametrically adjustable converters as claimed in any one of claims 1 to 5, wherein: the load network comprises a direct current load and an alternating current load;

the direct current load comprises a photovoltaic power generation system and an energy storage system;

the alternating current load comprises a variable-frequency intelligent household appliance.

7. The series of adjustable-parameter transformers of claim 5 in which:

determining voltage difference values V12, V13 and V23 between the first direct-current voltage V1, the second direct-current voltage V2 and the third direct-current voltage V3;

determining Vmin ═ { V12, V13, V23 };

and one of Vi and Vj corresponding to Vmin is used as an input signal of the isolation control stage, and the other one is used as an input voltage of the reference source circuit, wherein Vi is V1 or V2, Vj is V2 or V3, and Vi ≠ Vj.

8. A power supply assembly, the power supply assembly comprising a reference source, a protection unit and a feedback unit, characterized in that:

the feedback unit comprises a first feedback branch and a second feedback branch;

the input end of the first feedback branch is connected with the output end of the second feedback branch through a bias branch;

the reference source is simultaneously connected with the first feedback branch and the second feedback branch;

the feedback unit forms the output feedback stage of a series of variable parameter converters as claimed in any one of claims 1 to 7.

9. A power supply assembly as claimed in claim 8, wherein:

the protection unit also comprises an input protection circuit and an output protection circuit;

the input protection circuit is connected with the output end of the first feedback branch circuit and the input control stage;

the output protection circuit is connected with the input end of the second feedback branch circuit and the output feedback stage.

10. A power supply assembly as claimed in claim 8, wherein:

the power supply assembly further comprises a start-up circuit;

the start-up circuit is connected to the reference source, which constitutes the reference source circuit of the series of variable-parameter converters of claim 5.

Technical Field

The invention belongs to the technical field of converter circuits, and particularly relates to a series parameter-adjustable converter and a power supply assembly thereof.

Background

In terms of energy supply and conversion, electric energy is still the most stable and efficient energy form of the human society at present, and new energy and distributed power generation are mostly transmitted in a direct current form and are subjected to grid connection with a power grid through an inverter, a voltage stabilizer and secondary power transmission, so how to combine new energy power generation with traditional energy to the maximum extent is an important subject and research direction for the development of human at the present stage. The power transformer is an important component in a power distribution system, mainly plays roles of voltage transformation, current transformation, impedance transformation and electrical isolation, and along with the development of a distributed power supply and a smart grid, the traditional power frequency transformer has single function and only has an alternating current interface, so that the performance of the traditional power frequency transformer cannot meet the requirements of users. In recent years, the emergence of new power electronic devices (Si C, GaN) for high frequency, high voltage, etc. and the development of soft switching technology have enabled dc converters ranging from low power switching power supplies to high power, high density, high voltage dc converters.

US patent No. 3517300 first proposes the concept of a power electronic transformer, and the most common electronic power converter developed to date is a three-stage structure in which an input rectifier stage converts the voltage of a power grid into a stable direct current, an isolation stage converts the input direct current into a high-frequency square wave, the high-frequency square wave is converted into a direct current by a post-stage circuit after passing through a high-frequency transformer, and the converted alternating current is inverted and output at an output stage. The electronic transformer with the structure can realize larger capacity and higher power factor, the output voltage is not influenced by harmonic waves in a network, and a low-voltage direct current port is arranged to provide an interface circuit for distributed power generation.

The following related prior art, on a journal literature, has also been searched for electronic power transformers (collectively referred to herein as inverters) of multilevel structure:

[1]She X,Lukic S,Huang A Q,et al.Performance evaluation ofsolid state transformer based microgrid in FREEDM systems[C].Applied Power lectronics Conference and Exposition. IEEE Xplore,2011:182-188.

[2] in the morning, Gebaoming, Biaoqiang, research on power electronic transformers in a power distribution network [ J ], protection and control of a power system, 201240, (2) 34-39.

[3]Deng Y,Rong Q,Li W,et al.Single-Switch High Step-Up Converters With Built-In Transformer Voltage Multiplier Cell[J].IEEE Transactions on Power Electronics,2012,27(8):3557-3567.

[4] The three-phase cascade power electronic transformer and its control strategy are researched in the summary of electric machinery and control, 2016,20(8):32-39.

In terms of patent literature, CN112910001A discloses a three-stage optimal configuration method for a multi-voltage-class ac/dc hybrid system, which includes: in the first stage, at an optional power grid access point, with economic indexes of an alternating current-direct current hybrid system as optimization targets, renewable energy sources and load basic scenes constructed based on a Monte Carlo method and a k-means method are optimized, and meanwhile, power factors, power electronic transformers, renewable energy power generation and energy storage capacity of grid-connected points of the alternating current-direct current hybrid system are optimized; in the second stage, the relation between the energy storage charging and discharging depth, the discharging power and the energy storage service life is considered, and the energy storage capacity, the energy storage charging and discharging judgment parameters, the maximum discharging power and the charging and discharging depth of each bus are further optimized; and in the third stage, a grid connection goodness and badness function is established according to the distribution network voltage margin and the grid loss of the AC-DC hybrid system after grid connection, and the AC-DC hybrid system optimal configuration scheme and the access point are obtained by adopting basic scene calculation. The invention can realize the cooperative optimization of the capacity configuration, the grid-connected access and the operation strategy of the alternating current and direct current hybrid system.

However, the inventor finds that the multi-stage control parameters of the prior art multi-stage converter (transformer) are all static structures, cannot be adjusted in real time along with the change of a load network, and has a limited application range.

Disclosure of Invention

In order to solve the technical problem, the invention provides a series of parameter-adjustable converters and a power supply component box for the converters, wherein the power supply component box comprises a plurality of power supply components.

In particular, in a first aspect of the invention, a converter is presented, the converter comprising an input control stage, an isolation control stage, an inverter control stage, and an output feedback stage;

the input control stage has input control parameters, the isolation control stage has isolation control parameters, and the inversion control stage has inversion control parameters;

and the series of control parameters of the input control stage, the isolation control stage and the inversion control stage can be adjusted.

Specifically, the input control stage comprises a plurality of high-voltage rectifying circuits connected in parallel;

the isolation control stage comprises a DC-DC conversion circuit and an isolation protection circuit connected with the DC-DC conversion circuit;

the inversion control stage comprises a plurality of inversion controllers;

the output feedback stage is connected with the inversion control stage and the input control stage;

the output of the inversion control stage is used as the input of a load network;

the output feedback stage detects a real-time load signal of the load network and generates a feedback signal by combining an output signal of the inversion control stage;

determining the input control parameter based on the AC network parameter input by the input control stage;

adjusting the isolation control parameter based on an output signal of the input control stage;

adjusting the inversion control parameter based on the feedback signal and the isolation control parameter.

The plurality of parallel high-voltage rectifying circuits comprise a first high-voltage rectifying circuit, a second high-voltage rectifying circuit and a third high-voltage rectifying circuit;

the first high-voltage rectifying circuit, the second high-voltage rectifying circuit and the third high-voltage rectifying circuit respectively output a first direct-current voltage, a second direct-current voltage and a third direct-current voltage;

in the technical scheme of the invention, one of a first direct current voltage, a second direct current voltage and a third direct current voltage is used as an input voltage of a reference source circuit;

correspondingly, one of the first direct current voltage, the second direct current voltage or the third direct current voltage is determined as an input signal of the isolation control stage.

In another aspect of the invention, a power supply assembly is provided which may be applied in the converter. Specifically, the power supply assembly comprises a reference source, a protection unit and a feedback unit;

the reference source constitutes the reference source circuit of the aforementioned series of parameter-adjustable converters;

the feedback unit forms the output feedback stage of the series of adjustable-parameter converters;

the protection unit is part of the isolation control stage of the series of parametrically adjustable converters.

Preferably, the power module includes units built into a power module case.

In the power supply component cartridge, the feedback unit comprises a first feedback branch and a second feedback branch;

the input end of the first feedback branch is connected with the output end of the second feedback branch through a bias branch;

the reference source is simultaneously connected with the first feedback branch and the second feedback branch;

the power supply assembly further comprises a start-up circuit; the start-up circuit is connected to the reference source.

Forming a core component of the converter based on the power supply assembly; also, the power supply assembly may be used in other types of converters.

The converter provided by the invention realizes adjustable control of multi-level control parameters, thereby expanding the application range; meanwhile, the adjustment control is determined based on the parameters of the actual load network and the actual input end, and can be dynamically self-adjusted; and finally, the feedback control branch circuit realizes the closed-loop feedback of the input end based on the output signal and the protection signal, and ensures the output stability and the voltage safety of the converter.

Meanwhile, the power supply assembly and the power supply assembly box provided by the invention can enable the core assembly part of the converter to be transplanted to other converters, thereby further expanding the application range.

Further advantages of the invention will be apparent in the detailed description section in conjunction with the drawings attached hereto.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a main structure of a series of transformers with adjustable parameters according to an embodiment of the present invention

FIG. 2 is a detailed internal connection schematic diagram of a partial structure of the converter shown in FIG. 1

FIG. 3 is a schematic diagram of the internal modules of a power supply package for the inverter of FIG. 1

FIG. 4 is a schematic diagram of the feedback branch for the converter of FIG. 1

FIG. 5 is a schematic diagram of a protection unit for the converter of FIG. 1

Detailed Description

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

Fig. 1 is a schematic structural diagram of a series of transformers with adjustable parameters according to an embodiment of the present invention.

In fig. 1, the converter is shown to include an input control stage, an isolation control stage, an inverter control stage, and an output feedback stage.

The input control stage, the isolation control stage and the inversion control stage are connected in sequence, and the output of the previous stage is used as the input of the next stage; the output of the inversion control stage is used as the output of the converter, is connected to a load network and is simultaneously used as a feedback signal to be sent to the output feedback stage, and the output feedback stage generates a feedback signal to be sent to the input control stage.

Preferably, the load network comprises a dc load and an ac load; the direct current load comprises a photovoltaic power generation system and an energy storage system; the alternating current load comprises a variable-frequency intelligent household appliance.

As a specific implementation circuit, the isolation control stage includes a protection unit; the output feedback stage comprises a feedback unit;

the feedback unit comprises a first feedback branch and a second feedback branch;

the protection unit comprises an input protection circuit and an output protection circuit;

the input protection circuit is connected with the output end of the first feedback branch circuit and the input control stage;

the output protection circuit is connected with the input end of the second feedback branch circuit and the output feedback stage.

In fig. 1, the input control stage has input control parameters, the isolation control stage has isolation control parameters, and the inversion control stage has inversion control parameters.

As a significant advantage of the present invention, the above-mentioned series of control parameters of the input control stage, the isolation control stage and the inversion control stage are adjustable.

Specifically, the output of the inversion control stage is used as the input of a load network;

the output feedback stage detects a real-time load signal of the load network and generates a feedback signal by combining an output signal of the inversion control stage;

determining the input control parameter based on the AC network parameter input by the input control stage;

adjusting the isolation control parameter based on an output signal of the input control stage;

adjusting the inversion control parameter based on the feedback signal and the isolation control parameter.

On the basis of fig. 1, see fig. 2. Fig. 2 shows further details of part of the control stage in fig. 1.

In fig. 2, the input control stage comprises a plurality of high voltage rectifier circuits connected in parallel;

the isolation control stage comprises a DC-DC conversion circuit and an isolation protection circuit connected with the DC-DC conversion circuit;

the inversion control stage comprises a plurality of inversion controllers;

the output feedback stage is connected with the inversion control stage and the input control stage.

More specifically, in fig. 2, the DC-DC conversion circuit includes a reference source circuit;

the input control stage is connected with an alternating current network and converts alternating current network voltage input by the alternating current network into direct current voltage;

the plurality of parallel high-voltage rectifying circuits comprise a first high-voltage rectifying circuit, a second high-voltage rectifying circuit and a third high-voltage rectifying circuit;

the first high-voltage rectifying circuit, the second high-voltage rectifying circuit and the third high-voltage rectifying circuit respectively output a first direct-current voltage, a second direct-current voltage and a third direct-current voltage;

determining one of a first direct current voltage, a second direct current voltage or a third direct current voltage as an input signal of the isolation control stage based on the input control parameter;

correspondingly, one of the first direct current voltage, the second direct current voltage or the third direct current voltage is determined as the input voltage of the reference source circuit based on the input control parameter.

As a further example, the first dc voltage is denoted as V1, the second dc voltage is denoted as V2, and the third dc voltage is denoted as V3;

the above procedure for determining the input voltage signal of the isolation control stage and the input voltage signal of the reference source circuit is as follows:

(1) determining the voltage difference value between the first direct voltage V1, the second direct voltage V2 and the third direct voltage V3:

V12＝|V1-V2|；

V13＝|V1-V3|；

V23＝|V2-V3|；

(2) determining the minimum voltage difference:

Vmin＝{V12，V13，V23}；

(3) and one of Vi and Vj corresponding to Vmin is used as an input signal of the isolation control stage, and the other one is used as an input voltage of the reference source circuit, wherein Vi is V1 or V2, Vj is V2 or V3, and Vi ≠ Vj.

For example, assuming that V12 is minimum, V1 is taken as the input voltage signal of the isolation control stage and V2 is taken as the input voltage of the reference source circuit.

Preferably, the above determination is characterized by an input control parameter of the input control stage.

With continued reference to fig. 2, the isolation control stage further includes a high frequency transformer and a post-stage conversion circuit;

the isolation control stage converts an input direct current quantity signal into a high-frequency square wave, and the high-frequency square wave is converted into direct current quantity through a post-stage conversion circuit after being used as an input signal of the high-frequency transformer;

the isolation control parameter is used for determining the output power of the high-frequency transformer.

The inversion controller performs inversion output on the input direct current quantity signal;

the inversion control parameter is used for determining an output voltage value of the inversion controller.

The DC-DC conversion circuit includes a reference source circuit;

determining one of the first direct current voltage, the second direct current voltage, or the third direct current voltage as an input voltage of the reference source circuit based on the input control parameter.

In the reference source power supply, a start-up circuit is provided, which is connected to a reference source, constituting the reference source circuit of the converter.

Next, see fig. 3. Fig. 3 is a schematic diagram of the internal modules of a power supply assembly box for the converter of fig. 1.

In fig. 3, a power supply component cartridge is shown, in which various power supply components including a reference source, a protection unit, and a feedback unit are included.

More specifically, on the basis of fig. 3, referring to fig. 4, the feedback unit includes a first feedback branch and a second feedback branch; the input end of the first feedback branch is connected with the output end of the second feedback branch through a bias branch; the reference source is simultaneously connected with the first feedback branch and the second feedback branch;

preferably, the first feedback branch comprises a first error amplifier, and a non-inverting input terminal of the first error amplifier is connected to the reference source circuit; and the inverting input end of the first error amplifier is connected with the output end of the second feedback branch.

The bias circuit provides bias feedback signals for the first feedback branch and the second feedback branch.

Continuing, on the basis of fig. 3 and 4, see fig. 5.

The protection unit also comprises an input protection circuit and an output protection circuit;

the input protection circuit is connected with the output end of the first feedback branch circuit and the input control stage;

the output protection circuit is connected with the input end of the second feedback branch circuit and the output feedback stage.

The power supply assembly forms a relevant part of the converter and comprises: the isolation control stage comprises a protection unit; the output feedback stage comprises a feedback unit.

The advantages of the invention are at least reflected in:

(1) the adjustable control of multi-stage control parameters is realized, so that the application range is expanded;

(2) the adjustment control is determined based on parameters of an actual load network and an actual input end, and can be dynamically self-adjusted;

(3) the feedback control branch circuit realizes the closed-loop feedback of the input end based on the output signal and the protection signal, and ensures the output stability and the voltage safety of the converter;

(4) the power supply assembly and the power supply assembly box can enable the core assembly part of the converter to be transplanted to other converters, and further expand the application range.

It should be noted that the description of the drawings given in the various embodiments of the present invention is merely schematic and does not represent all of the specific circuit configurations;

the present invention is not limited to the specific module structure described in the prior art. The prior art mentioned in the background section can be used as part of the invention to understand the meaning of some technical features or parameters. The scope of the present invention is defined by the claims.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.