CN212965121U - Current sampling circuit and converter multi-machine parallel system - Google Patents
Current sampling circuit and converter multi-machine parallel system Download PDFInfo
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Abstract
The utility model provides a parallel system of current sampling circuit and converter multimachine is applied to photovoltaic power generation technical field, and this circuit includes: the system comprises a system sampling module and a plurality of single machine sampling modules, wherein the input end of the system sampling module is connected with a power supply line of a load, the output end of the system sampling module is sequentially connected with the input end of each single machine sampling module in series to form a series circuit, and the output end of each single machine sampling module is respectively connected with different converter controllers in a multi-machine parallel system of the converter. When load current flows in a power supply line, sampling current at the output end of the system sampling module flows through the input end of each single-machine sampling module, the output end of each single-machine sampling module synchronously outputs corresponding sampling current to the converter controller connected with the output end of the single-machine sampling module, each converter controller can synchronously obtain the sampling current, the cooperative operation of each converter in a parallel system is ensured, and the stability of the multi-machine parallel system of the converters is improved.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field, in particular to current sampling circuit and converter multimachine parallel system.
Background
In an application scene with larger load required power, a converter multi-machine parallel system is mostly adopted to supply power to the load, the parallel system comprises a plurality of converters, and the output ends of the converters are connected in parallel and then supply power to the load, so that the load capacity of the parallel system is improved.
Each converter in the converter multi-machine parallel system is provided with a converter controller, and each converter controller needs to control the output current of the corresponding converter according to the load current, so that the current-sharing operation among a plurality of converters in the parallel system is realized. Referring to fig. 1, fig. 1 is a schematic structural diagram of a converter multi-machine parallel system in the prior art, as shown in fig. 1, the parallel system adopts a control mode of one host and multiple slaves, a current sensor collects load current, a converter controller serving as the host acquires sampling current through a conditioning circuit, and output current of a converter corresponding to the current sensor is controlled according to the obtained sampling current. And meanwhile, the converter controller as the master transmits the digital quantity corresponding to the sampling current to other converter controllers as slaves in the parallel system through a preset CAN communication network, so that each converter controller as the slave controls the output current of the corresponding converter.
According to the above contents, in the converter multi-machine parallel system in the prior art, the CAN communication network is adopted to transmit the sampling current, and because the transmission rate of the CAN communication network is low, when the sampling current is transmitted from the host to each slave in the parallel system, especially the last slave in the CAN network, a certain time delay is inevitably generated, so that each converter in the parallel system cannot cooperatively operate, and the stability of the converter multi-machine parallel system is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a current sampling circuit and converter multimachine parallel system through the cooperation of system sampling module and unit sampling module for each converter controller obtains the sampling current in step in the parallel system, ensures each converter in the parallel system and moves in coordination, improves the stability of converter multimachine parallel system.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the utility model provides a current sampling circuit, include: a system sampling module, a plurality of single-machine sampling modules, wherein,
the input end of the system sampling module is connected with a power supply line of a load;
the output end of the system sampling module is sequentially connected with the input end of each single-machine sampling module in series to form a series loop;
and the output end of each single-machine sampling module is respectively connected with different converter controllers in the converter multi-machine parallel system.
Optionally, the single-machine sampling module includes a sampling module and a conditioning circuit, wherein,
the input end of the sampling module is used as the input end of the single-machine sampling module;
the output end of the sampling module is connected with the input end of the conditioning circuit;
the output end of the conditioning circuit is used as the output end of the single-machine sampling module;
the sampling module outputs an output side current corresponding to the input side current;
and the conditioning circuit adjusts the current of the output side of the sampling module into a sampling current meeting the preset requirement.
Optionally, the system sampling module includes a first current transformer, where the first current transformer outputs a first sampling current having a first proportional relationship with the input-side current;
the sampling module comprises a second current transformer which outputs output side current which is in a second proportional relation with the first sampling current.
Optionally, the rated current of the primary side of the second current transformer is not less than the rated current of the secondary side of the first current transformer.
Optionally, the input end of the first current transformer is connected in series between the combiner box and the load in the converter multi-machine parallel system.
Optionally, the converter controller calculates the load current of the load according to the first sampling current, the first proportional relationship, the second sampling current, and the second proportional relationship.
Optionally, the system sampling module comprises a first current sensor.
Optionally, the single-machine sampling module comprises a sampling module and a conditioning circuit, and the sampling module comprises a second current sensor, wherein,
the input end of the second current sensor is used as the input end of the single-machine sampling module;
the output end of the second current sensor is connected with the input end of the conditioning circuit;
the output end of the conditioning circuit is used as the output end of the single-machine sampling module;
the second current sensor outputs an output side current corresponding to the input side current;
and the conditioning circuit adjusts the current of the output side of the second current sensor into a sampling current meeting a preset requirement.
Optionally, the utility model provides a current sampling circuit still includes: a system power supply module and a number of single-machine power supply modules equal to the number of the second current sensors, wherein,
the system power supply module is connected with a power supply end of the first current sensor;
and each single power supply module is respectively connected with the power supply ends of the second current sensors which are different from each other.
In a second aspect, the utility model provides a converter multimachine parallel system, include: a plurality of converters, a combiner box, and a current sampling circuit according to any one of the first aspect of the present invention, wherein,
the input end of each converter is connected with an energy storage device, and the output end of each converter is connected in parallel with the input end of the combiner box;
the output end of the combiner box is connected with a load through the input end of a system sampling module in the current sampling circuit;
the output end of each single-machine sampling module in the current sampling circuit is connected with different converter controllers in the converter multi-machine parallel system.
The utility model provides a current sampling circuit, include: the system comprises a system sampling module and a plurality of single machine sampling modules, wherein the input end of the system sampling module is connected with a power supply line of a load, the output end of the system sampling module is sequentially connected with the input end of each single machine sampling module in series to form a series circuit, and further, the output end of each single machine sampling module is respectively connected with different converter controllers in a multi-machine parallel system of the converter. When the load works normally and the load current flows in the power supply line, the output end of the system sampling module outputs the sampling current corresponding to the load current, furthermore, the output end of the system sampling module and the input end of each single machine sampling module form a series circuit, the sampling current output by the system sampling module flows through the input end of each single machine sampling module, the output end of each single machine sampling module synchronously outputs the corresponding sampling current to the converter controller connected with the output end of the single machine sampling module, so that each converter controller controls the corresponding converter output current according to the sampling current, compared with the prior art that the sampling current is transmitted through a preset CAN communication network, the converter controllers in the parallel system can synchronously obtain sampling current, so that the converters in the parallel system can cooperatively operate, and the stability of the converter multi-machine parallel system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a converter multi-machine parallel system in the prior art;
fig. 2 is a schematic connection diagram of a current sampling circuit provided in the present invention;
fig. 3 is a schematic connection diagram of another current sampling circuit provided in the present invention;
fig. 4 is a schematic connection diagram of another current sampling circuit provided in the present application;
fig. 5 is a circuit topology diagram of a conditioning circuit included in the current sampling circuit provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Optionally, refer to fig. 2, fig. 2 is a connection schematic diagram of a current sampling circuit provided in the application of the present invention, as shown in the figure, the converter multi-machine parallel system includes multiple converters 30, each converter 30 is provided with a converter controller (shown by MCU in fig. 2) correspondingly, for example, the converter controller corresponding to the #1 converter is #1MCU, the converter controller corresponding to the #2 converter is #2MCU, and so on, and this is not repeated herein. In practical applications, no matter how each converter 30 is connected, the first converter is generally set as a master, and the other converters in the system are used as slaves.
The input end of the converter 30 is connected to an energy storage device, such as an energy storage battery system (not shown in the figure), and the output end of each converter 30 is connected in parallel, optionally, in order to facilitate the connection of subsequent power supply lines, the output end of each converter 30 is often connected in parallel to a combiner box (not shown in the figure), and further, the combiner box is connected to the load 40 through the power supply line, and outputs the load demand power to the load 40 according to the power demand of the load 40.
It should be noted that, to the setting of each converter among the parallel system of converter multimachine and among the parallel system the embodiment of the utility model discloses other content not mentioned can all refer to prior art and realize, the utility model discloses do not limit to this.
Based on above-mentioned content, the embodiment of the utility model provides a current sampling circuit includes: a system sampling module 10 and a plurality of stand-alone sampling modules 20, wherein,
the input end of the system sampling module 10 is connected to the power supply line of the load 40, and when a load current flows through the power supply line, the input end of the system sampling module 10 will synchronously flow through the load current, and at the same time, the output end of the system sampling module 10 will output a sampling current corresponding to the input side current, i.e. the load current.
Based on the connection mode, the sampling current output by the output end of the system sampling module 10 is transmitted in the obtained series circuit, and when current flows at the input side of each single-machine sampling module 20, the output side outputs the sampling current corresponding to the current at the input side.
Further, the output end of each single-machine sampling module 20 is respectively connected to different converter controllers in the multi-machine parallel system of the converters, and each converter controller can read the sampling current provided by the output side of the single-machine sampling module 20 connected to itself, so as to obtain the current load current in the current system according to the corresponding relationship between the current at the output side and the current at the input side of the system sampling module 10 and the single-machine sampling module 20, and execute corresponding control logic, thereby ensuring the current-sharing operation among the converters in the parallel system.
It should be noted that the embodiment of the utility model provides a system sampling module 10 and unit sampling module 20 among the current sampling circuit, the corresponding relation between output side electric current and the input side electric current is clear and definite proportional relation, and the sampling current of finally being exported by unit sampling module 20, and the corresponding relation between the load current that system sampling module 10 input flows through, proportional relation promptly, when in-service use, also clear and definite knowable. The specific corresponding relationship between the input side and the output side of the system sampling module and the single-machine sampling module can be selected according to the load current of a power supply line and the specific setting of each converter controller in the multi-machine parallel system.
Optionally, in practical application, the utility model provides a unit sampling module can set up respectively inside each converter, realizes above-mentioned relation of connection through laying interconnecting link.
To sum up, the current sampling circuit provided by the embodiment of the present invention outputs a sampling current corresponding to the load current when the load is working normally and the load current flows through the power supply line, and further, the output terminal of the system sampling module and the input terminal of each single-unit sampling module form a series circuit, the sampling current output by the system sampling module flows through the input terminal of each single-unit sampling module, the output terminal of each single-unit sampling module outputs the sampling current corresponding to the synchronization to the converter controller connected to its output terminal, so that each converter controller controls the corresponding converter output current according to the sampling current, compared with the prior art in which the sampling current is transmitted through the preset CAN communication network, each controller of the converters in the parallel system CAN synchronously obtain the sampling current, thereby ensuring the cooperative operation of each converter in the parallel system, the stability of the converter multi-machine parallel system is improved.
Optionally, referring to fig. 3, fig. 3 is a schematic connection diagram of another current sampling circuit provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 2, this embodiment further provides an optional structure of a single-machine sampling module in the current sampling circuit, which specifically includes: a sampling module 201 and a conditioning circuit 202, wherein,
the input end of the sampling module 201 serves as the input end of the single-machine sampling module, and forms a series circuit with the output end of the system sampling module 10 according to the connection mode, and the sampling module 201 is used for collecting sampling current of the output side of the system sampling module 10 and outputting corresponding current of the output side.
The output end of the sampling module 201 is connected with the input end of the conditioning circuit 202, and the output end of the conditioning circuit 202 is used as the output end of the single-machine sampling module and is connected with the corresponding converter controller. When the output end of the sampling module 201 outputs the output side current corresponding to the input end thereof to the conditioning circuit 202, the conditioning circuit 202 adjusts the obtained output side current to the sampling current meeting the preset requirement. It is conceivable that the preset requirements mentioned here are set according to the reading rule of the converter controller, and the setting rule may be set with reference to the conditioning circuit in the prior art, and will not be described here again.
Optionally, referring to fig. 4, fig. 4 is a schematic connection diagram of another current sampling circuit provided by the present invention, and on the basis of the embodiments shown in fig. 2 and fig. 3, an embodiment of the present invention provides a specific configuration manner of the current sampling circuit.
Specifically, the system sampling module 10 includes a first current transformer having an input connected in series between the parallel node on the output side of the converter and the load 40, and it is contemplated that if a combiner box is provided in the parallel system, the input of the first current transformer should be connected in series between the combiner box and the load 40, specifically, between the combiner box and the load 40. According to the basic operation principle of the current transformers, when the load 40 operates and a load current flows in a power supply line, the output end of the first current transformer outputs a first sampling current having a first proportional relation with the input side current.
Further, the embodiment of the utility model provides an each sampling module 201 in the current sampling circuit the structure is the same, all adopts second current transformer to realize. The input end of each second current transformer is connected with the output end of the first current transformer in series to form a series loop, when the output end of the first current transformer outputs the first sampling current, the input ends of the second current transformers can synchronously flow the same current, and correspondingly, the output end of each second current transformer can output current at the output side which is in a second proportional relation with the first sampling current to the conditioning circuit 202 connected with the output end of the second current transformer.
The converter controller is connected to the output end of the corresponding conditioning circuit 202, receives a second sampling current provided by the conditioning circuit 202 and meeting the preset requirement, and calculates the load current of the load 40 according to the first sampling current output by the first current transformer, the first proportional relation, the second sampling current, and the second proportional relation.
It is conceivable that the first proportional relationship is obtained based on the transformation ratio of the first current transformer, and in most cases, in order to simplify the data processing process of the converter controller, the transformation ratio of the first current transformer may be directly used as the first proportional relationship; similarly, the second proportional relationship of the sampling module 201 is also obtained based on the transformation ratio of the second current transformer, and the transformation ratio of the second current transformer may also be directly used as the second proportional relationship. It is further conceivable that the second proportional relations of the sampling modules 201 may be set to the same values, or may be set to different proportional relations according to actual requirements. When the second proportional relation of each sampling module 201 adopted different numerical values, the control algorithm of the corresponding converter controller of corresponding adjustment of needs, as long as can reach the final requirement of the operation of flow equalizing of each converter in the control parallel system can, do not surpass the utility model discloses under the prerequisite of core thought scope, all belong to equally the utility model discloses in the scope.
For the process that the converter controller finally performs the back-stepping calculation to obtain the load current according to the obtained second sampling current, the process can be implemented by referring to an algorithm in the prior art, and details are not repeated here.
Optionally, as can be seen from the connection relationship of the embodiment provided in fig. 4, the current flowing through the input side of the first current transformer is a load current, so the input side rated current of the first current transformer should not be less than the maximum load current that can be output by the parallel system, and the input side current of each second current transformer is the same as the output side current of the first current transformer, so the primary side rated current of each second current transformer should not be less than the secondary side rated current of the first current transformer.
To sum up, the embodiment of the utility model provides a current sampling circuit adopts the second current transformer of the first current transformer of system level and unit level to constitute two-stage mutual-inductor system, realizes sampling current's series transmission, compares with the mode through predetermineeing CAN communication network transmission sampling current among the prior art, and each converter controller CAN obtain sampling current in step among the parallel system, ensures each converter in the parallel system and moves in coordination, improves converter multimachine parallel system's stability.
Furthermore, a current transformer is adopted to replace a current sensor in the prior art, and the current transformer is a passive device, so that a power supply module which is arranged in the prior art for ensuring the normal work of the current sensor can be omitted, and the problems of power supply stability and reliability caused by the arrangement of the power supply module in the prior art can be effectively solved.
Furthermore, in practical application, if the load is far from the multi-machine parallel system, the voltage sampling signal output by the current sensor in the prior art needs to be transmitted to the host through a long cable, and the voltage sampling signal is easily interfered by a peripheral interference source in the transmission process, so that the sampling precision is not high.
Optionally, the current sensor may output not only a voltage sampling signal but also a current sampling signal, so that on the premise of ignoring the above adverse effect caused by the power supply module, or on the premise of overcoming the adverse effect caused by the power supply module in other ways, the system sampling module in each of the above embodiments may also include the first current sensor, and correspondingly, each single-machine sampling module includes the sampling module and the conditioning circuit, and the sampling module includes the second current sensor.
In this case, the connection relationship inside the current sampling circuit is basically the same as that in the foregoing embodiment, the input end of the first current sensor as the system sampling module is connected to the power supply line of the load, the output end of the first current sensor is connected in series to the input end of each single-machine sampling module to form a series circuit, and the output ends of the single-machine sampling modules are respectively connected to different converter controllers in the multi-machine parallel system of the converter.
Specifically, the input end of each second current sensor is used as the input end of a single-machine sampling module, the output end of each second current sensor is connected with the input end of a conditioning circuit, and the output end of the conditioning circuit is used as the output end of the single-machine sampling module and is connected with the corresponding converter controller. The second current sensor outputs output side current corresponding to the input side current, and the conditioning circuit adjusts the output side current of the second current sensor to be sampling current meeting preset requirements.
Further, under the condition that adopts current sensor to gather the electric current, the embodiment of the utility model provides a current sampling circuit can also include system power module to and the unit power module that equals with second current sensor quantity. Specifically, the system power supply module is connected with a power supply end of the first current sensor and supplies power to the first current sensor; each single-machine power supply module is respectively connected with the power supply ends of the second current sensors which are different from each other and respectively supplies power to the second current sensors connected with the single-machine power supply modules.
In combination with the above, under the condition that the system sampling module and the sampling module are both implemented based on the current sensor, the connection relationship between the internal components of the current sampling circuit is basically the same as that of the embodiments of fig. 2 to 4, and the core lies in that the sampling circuit without transmission delay is constructed by two stages of sampling modules, thereby solving the delay problem existing in the prior art and further improving the stability and control accuracy of the parallel system.
It is conceivable that the model selection of the first current sensor and the second current sensor may be performed with reference to the above-described model selection method of the first current transformer and the second current transformer, thereby ensuring the normal operation of the respective current sensors.
Optionally, referring to fig. 5, fig. 5 is a circuit topology diagram of a conditioning circuit included in the current sampling circuit provided in the present invention, and fig. 5 exemplarily shows an optional configuration of the conditioning circuit, which is suitable for the conditioning circuit described in any of the above embodiments.
Optionally, the utility model also provides a converter multimachine parallel system, include: a plurality of current transformers, a combiner box, and a current sampling circuit as provided in any of the above embodiments, wherein,
the input end of each converter is connected with an energy storage device, and the output end of each converter is connected in parallel with the input end of the combiner box;
the output end of the combiner box is connected with a load through the input end of a system sampling module in the current sampling circuit;
the output end of each single-machine sampling module in the current sampling circuit is connected with different converter controllers in the converter multi-machine parallel system.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, but also include other elements not expressly listed or inherent to such article or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A current sampling circuit, comprising: a system sampling module, a plurality of single-machine sampling modules, wherein,
the input end of the system sampling module is connected with a power supply line of a load;
the output end of the system sampling module is sequentially connected with the input end of each single-machine sampling module in series to form a series loop;
and the output end of each single-machine sampling module is respectively connected with different converter controllers in the converter multi-machine parallel system.
2. The current sampling circuit of claim 1, wherein the stand-alone sampling module comprises a sampling module and a conditioning circuit, wherein,
the input end of the sampling module is used as the input end of the single-machine sampling module;
the output end of the sampling module is connected with the input end of the conditioning circuit;
the output end of the conditioning circuit is used as the output end of the single-machine sampling module;
the sampling module outputs an output side current corresponding to the input side current;
and the conditioning circuit adjusts the current of the output side of the sampling module into a sampling current meeting the preset requirement.
3. The current sampling circuit of claim 2, wherein the system sampling module comprises a first current transformer that outputs a first sampled current in a first proportional relationship to the input side current;
the sampling module comprises a second current transformer which outputs output side current which is in a second proportional relation with the first sampling current.
4. The current sampling circuit of claim 3, wherein the primary side current rating of the second current transformer is no less than the secondary side current rating of the first current transformer.
5. The current sampling circuit of claim 3, wherein the input terminal of the first current transformer is connected in series between a combiner box and the load in the converter multi-machine parallel system.
6. The current sampling circuit of claim 3, wherein the converter controller calculates a load current of the load based on the first sampled current, the first proportional relationship, the output side current, and the second proportional relationship.
7. The current sampling circuit of claim 1, wherein the system sampling module comprises a first current sensor.
8. The current sampling circuit of claim 7, wherein the stand-alone sampling module comprises a sampling module and a conditioning circuit, and the sampling module comprises a second current sensor, wherein,
the input end of the second current sensor is used as the input end of the single-machine sampling module;
the output end of the second current sensor is connected with the input end of the conditioning circuit;
the output end of the conditioning circuit is used as the output end of the single-machine sampling module;
the second current sensor outputs an output side current corresponding to the input side current;
and the conditioning circuit adjusts the current of the output side of the second current sensor into a sampling current meeting a preset requirement.
9. The current sampling circuit of claim 8, further comprising: a system power supply module and a number of single-machine power supply modules equal to the number of the second current sensors, wherein,
the system power supply module is connected with a power supply end of the first current sensor;
and each single power supply module is respectively connected with the power supply ends of the second current sensors which are different from each other.
10. A converter multi-machine parallel system is characterized by comprising: a plurality of current transformers, a combiner box, and the current sampling circuit of any one of claims 1-9,
the input end of each converter is connected with an energy storage device, and the output end of each converter is connected in parallel with the input end of the combiner box;
the output end of the combiner box is connected with a load through the input end of a system sampling module in the current sampling circuit;
the output end of each single-machine sampling module in the current sampling circuit is connected with different converter controllers in the converter multi-machine parallel system.
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