CN213518238U

CN213518238U - Multiplexing type photovoltaic control device

Info

Publication number: CN213518238U
Application number: CN202022377635.7U
Authority: CN
Inventors: 赵秀江; 秦志
Original assignee: Shenzhen Hopewind Electric Co Ltd
Current assignee: Shenzhen Hopewind Electric Co Ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-06-22
Anticipated expiration: 2030-10-23

Abstract

The utility model discloses a multiplexing type photovoltaic control device, it includes at least one control panel, every control panel includes the first MCU controller that is used for net side control, the second MCU controller that is used for DC-DC side control and the FPGA device that is used for interface extension and fault protection, first MCU controller is connected with second MCU controller and FPGA device electricity respectively; and all the control panels are connected in parallel, and the communication transfer is carried out through the FPGA device. Through the scheme, the core control panel capable of being expanded at will is standardized, the required functions can be realized by using one single control panel under the condition of low power, power expansion is realized by splicing a plurality of control panels under the condition of high power, the single panel is not required to be redesigned, only necessary communication connection is required to be added between the panels, and tasks among the control panels are distributed through communication.

Description

Multiplexing type photovoltaic control device

Technical Field

The utility model relates to a photovoltaic power generation's controlling means specifically is a photovoltaic controlling means that can multiplexing type based on FPGA.

Background

Fossil energy is used as non-renewable energy, and the reserves thereof are gradually exhausted, and the power generation technology of solar energy, which is an important component of renewable energy, is relatively mature and becomes an important branch of new energy utilization.

A photovoltaic power generation system generally includes two aspects, an inverter and a photovoltaic module; the inverter is divided into two parts, namely a power conversion part and a control device; the control device is used as a control core of the photovoltaic power generation system, and functions of core algorithm, wave generation, sampling, communication and the like are realized.

The existing photovoltaic control device is realized by one control panel, different control devices are used at different power levels, and the control device cannot be used universally at a full-power section.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

According to an aspect of the present application, there is provided a multiplexing-type photovoltaic control apparatus, including at least one control board, each control board including a first MCU controller for grid-side control (DC-AC control), a second MCU controller for DC-DC side control, and an FPGA (Field Programmable Gate Array) device for interface extension and fault protection, the first MCU controller being electrically connected to the second MCU controller and the FPGA device, respectively.

Furthermore, the control panels are connected in parallel, and communication transfer is carried out through the FPGA device. According to the scheme, the standardized core control panel capable of being expanded at will is designed, a single control panel is used to realize required functions under the condition of low power, power expansion is realized in the mode of splicing a plurality of control panels under the condition of high power, the single panel is not required to be redesigned, necessary communication connection is only required to be added between the panels, and tasks among the control panels are distributed through communication.

Furthermore, the control panel also comprises a time sequence control circuit electrically connected with the first MCU controller, and the time sequence control circuit is used for stipulating the external communication time sequence of each control panel. For example, when three control boards are connected in parallel, the timing control circuit makes an external communication timing sequence for the first MCU controller of the 3 control boards, the total communication period is T, the time allocated to the 3 first MCU controllers is T1, T2, and T3, the first MCU controller at the initial position of the transmission link sends a reference pulse, the other two first MCU controllers of the link receive the pulse, and count the time based on the pulse, and the first MCU controllers of the control boards communicate with each other within their respective communication time.

Furthermore, the control panel still includes with first MCU controller, second MCU controller, and FPGA electric connection's control panel trench number recognition circuit, control panel trench number recognition circuit is used for discerning the trench number of each control panel and according to the corresponding logic of trench number operation.

Furthermore, the control board slot position number identification circuit is also used for identifying the type of the detection board, and realizes the software calibration and specification self-adaptation of the detection boards with different power grades.

Furthermore, the control board slot number identification circuit identifies the control board slot number and the type of the detection board by means of AD sampling or IO.

Furthermore, the communication between each control board and the monitoring terminal is realized by adopting a time division multiplexing mode.

The utility model provides a can multiplexing photovoltaic inverter controlling means, its beneficial effect as follows: the photovoltaic inverters with different power levels are realized through a core control panel, power expansion can be realized by increasing the number of the control panels under the condition of high power, a control device does not need to be developed again, development cost is reduced, hardware is reused, and reliability is high; meanwhile, the control device can automatically load corresponding codes through the time sequence control circuit and the control panel slot number identification circuit aiming at detection boards with different power grades, so that the codes can run in a self-adaptive mode, and the control device has good expandability.

Drawings

The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used to designate like or similar parts throughout the figures thereof. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to explain the principles and advantages of the invention. In the drawings:

FIG. 1 is a schematic block diagram of a single control panel of the present invention;

fig. 2 is a schematic block diagram of the parallel connection of two control panels according to the present invention;

fig. 3 is a schematic diagram of a control board slot number identification circuit of the present invention;

fig. 4 is a schematic diagram of the timing control circuit of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that the figures and descriptions have omitted, for the sake of clarity, the representation and description of components and processes that are not relevant to the present invention and known to those of ordinary skill in the art. In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A typical photovoltaic inverter control system includes two MCUs, which are respectively used to implement DC-AC control and DC-DC control, and also includes an FPGA device, which is used to implement functions such as signal switching and fault protection. With the improvement of the power level of the inverter, the number of MPPT required to be realized can be synchronously increased, the MCU on the original DC-DC side can not meet the control requirement, the traditional method is to replace one MCU with another MCU, so that the design of a control panel needs to be carried out again, for the inverters with different power levels, different control panels are used, and the maintenance amount of a single board can be multiplied.

This patent only develops a section control core plate, and in high-power controlling means uses, the mode through the quantity that increases the control veneer comes compatible system demand, need not draw the veneer again, saves hardware development cost, carries out the communication transfer through the FPGA device between the newly-increased control veneer, increases the necessary communication between the board simultaneously, realizes many controlling means's data interaction.

The utility model discloses a multiplexing type photovoltaic inverter controlling means, including one or more control panels, connect between each control panel and.

As a specific example, referring to fig. 1, the multiplexing-type photovoltaic inverter control device includes a single control board, and when the single control board is needed, the control device includes a first MCU controller (MCU-1), a second MCU controller (MCU-2), and a FPGA (Field Programmable Gate Array) device, where the first MCU controller (MCU-1) is electrically connected to the second MCU controller (MCU-2) and the FPGA device, respectively. The first MCU controller (MCU-1) is used as a main controller, is in point-to-point communication with the FPGA device and the second MCU controller (MCU-2), and completes AD sampling and core control algorithm of a network side at the same time. And the second MCU controller (MCU-2) mainly realizes AD sampling of DC-DC, MPPT algorithm and realization. The FPGA device realizes the logics of interface expansion, logic processing, communication switching, fault protection and the like.

As another embodiment, referring to fig. 2, when power expansion is performed and a single control board cannot meet the requirements, processing is performed by using two control boards, communication between boards is added on the basis of the single control board, and a control board slot number identification circuit is provided to implement a control board slot number identification function, such as ID1 and ID2 in the drawing, where the slot number function is implemented by IO, two slot number identifications can be implemented by one IO, 2n slot number identifications can be implemented by n IOs, and when a single board is powered on, the slot number is determined first, and different logics are run according to the slot number, as shown in fig. 3.

In addition, in order to realize centralized control among the multiple controllers, the control board is further provided with a time sequence control circuit electrically connected with each first MCU controller, and the control circuit is implemented by a token ring-like mechanism, and the implementation mode is as follows:

as shown in fig. 4, for the external communication sequence of 3 control boards, the total communication period is T, the time allocated to the 3 control boards is T1, T2, T3, respectively, the first MCU chip of the control board at the start position of the transmission link transmits a reference pulse, the other two control boards of the link receive the pulse, and perform time counting based on the pulse, and each control board performs external communication within the respective communication time. The communication between the multiple control boards and the monitoring terminal is realized by adopting a time division multiplexing mode.

The inverter can be compatible from a single-phase user inverter to a group string inverter with the power level exceeding 200KW by increasing or reducing the number of the control device single plates, the single plate hardware can be multiplexed, and the communication between the plates is switched through the FPGA. In the application of a plurality of control boards, the version identification of a single board is realized by using a single board ID, and the self-adaptive operation of MCU and FPGA codes is further realized; and matching inverters of various power levels by detecting the version identification of the bottom plate.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

While the present invention has been disclosed above by the description of specific embodiments thereof, it should be understood that all of the embodiments and examples described above are illustrative and not restrictive. Various modifications, improvements or equivalents to the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.

Claims

1. A multiplexing type photovoltaic control device is characterized in that: the system comprises at least one control panel, wherein each control panel comprises a first MCU controller used for network side control, a second MCU controller used for DC-DC side control and an FPGA device used for interface expansion and fault protection, and the first MCU controller is respectively and electrically connected with the second MCU controller and the FPGA device.

2. The multiplexing-type photovoltaic control apparatus according to claim 1, wherein: and all the control panels are connected in parallel, and the communication transfer is carried out through the FPGA device.

3. The multiplexing-type photovoltaic control apparatus according to claim 1 or 2, characterized in that: the control panel also comprises a time sequence control circuit electrically connected with the first MCU controller, and the time sequence control circuit is used for stipulating the external communication time sequence of each control panel.

4. The multiplexing-type photovoltaic control apparatus according to claim 1 or 2, characterized in that: the control panel also comprises a control panel slot number identification circuit electrically connected with the first MCU controller, the second MCU controller and the FPGA, and the control panel slot number identification circuit is used for identifying the slot number of each control panel and running corresponding logic according to the slot number.

5. The multiplexing-type photovoltaic control apparatus according to claim 4, wherein: the control board slot number identification circuit is also used for detecting the identification of board types.

6. The multiplexing-type photovoltaic control apparatus according to claim 5, wherein: the control board slot number identification circuit identifies the control board slot number and the type of the detection board by means of AD sampling or IO.

7. The multiplexing-type photovoltaic control apparatus according to claim 1 or 2, characterized in that: and the communication between each control board and the monitoring terminal is realized by adopting a time division multiplexing mode.