CN204101662U - Photovoltaic generating system AC parameters of electric power on-line computing model - Google Patents

Abstract

The utility model relates to an online monitor for power parameters on the AC side of a photovoltaic power generation system, comprising: a three-phase electric energy measurement circuit module and a control module connected to the three-phase electric energy measurement circuit module; the three-phase electric energy measurement circuit module includes: A power detection chip suitable for measuring the voltage and current parameters of each phase, and a current and voltage acquisition circuit of each phase; the output terminals of the current and voltage acquisition circuits of each phase are respectively connected with the current and voltage input terminals of the power detection chip of the corresponding phase The electric energy detection chips of each phase input the measurement parameters of the corresponding phase lines to the control module; the control module is connected with a display module to display the measurement parameters; the electric energy monitor of the utility model fully considers the Real-time, accurate, and efficient, it realizes simultaneous measurement of three-phase electricity, and makes data collection and analysis intuitive, automatic, and networked.

Description

Photovoltaic power generation system AC side power parameter online monitor

technical field

The utility model relates to an on-line monitor for power parameters on the AC side of a photovoltaic power generation system.

Background technique

In the photovoltaic power generation system, the direct current generated by photovoltaic modules will eventually be transformed into single-phase or three-phase alternating current through inversion and other processing. Therefore, it is necessary to conduct accurate and complete online monitoring and analysis of power parameters for this single-phase or three-phase alternating current. , so as to provide an effective basis for the power quality analysis of photovoltaic power generation. At present, the existing products convert the three-phase AC voltage and AC current into low-voltage signals through a certain step-down and sampling processing circuit, and then undergo analog-digital processing, and use smart chips to complete the detection and calculation of power parameters. Long-term use often brings problems of zero point offset and gain offset, which cannot be calibrated online. Moreover, it is generally impossible to view the current detected power parameters intuitively in real time, and corresponding computer software must be used to read the data in real time for monitoring and analysis.

Utility model content

The purpose of the utility model is to provide an on-line monitor for power parameters on the AC side of a photovoltaic power generation system to solve the technical problem of on-line measurement of three-phase AC power.

In order to solve the above technical problems, the utility model provides an on-line monitor for power parameters on the AC side of a photovoltaic power generation system, including: a three-phase electric energy measurement circuit module, a control module connected to the three-phase electric energy measurement circuit module; The phase electric energy measurement circuit module includes: an electric energy detection chip suitable for respectively measuring the voltage and current parameters of each phase, and each phase current and voltage acquisition circuit; the output terminals of each phase current and voltage acquisition circuit are connected with the electric energy detection The current and voltage input ends of the chips are connected, and the electric energy detection chips of each phase input the measurement parameters of the corresponding phase wires to the control module; the control module is connected with a display module to display the measurement parameters.

Preferably, in order to realize selective control of each electric energy detection chip, the chip selection terminal of the control module is respectively connected to the chip selection control terminal of each electric energy detection chip.

Preferably, in order to avoid the problems of zero point offset and gain offset caused by long-term use, the corresponding current and voltage input terminals of each power detection chip are also suitable for connecting to a grounding switch, that is, when the grounding switch is closed, the The control module performs numerical correction.

Preferably, in order to achieve remote control to read the detection data of the monitor, the control module is also connected to the RS485 communication module and/or the GPRS wireless module.

Optionally, in order to further realize command input, the display module adopts a touch screen to realize command input to the control module; or the control module is connected with a keyboard to realize command input to the control module.

Preferably, in order to meet the power supply requirements of each chip in the entire monitor, the on-line monitor for power parameters on the AC side of the photovoltaic power generation system further includes a multi-output regulated power supply, the regulated power supply includes: a rectification and filtering module, and the The output terminal of the rectification and filtering module is connected with the 12V voltage stabilization module, the 5V voltage stabilization module and the 3.3V voltage stabilization module in turn, so as to be suitable for simultaneously outputting 5V and 3.3V DC voltages.

The beneficial effect of the utility model is that the electric energy monitor of the utility model fully considers the real-time performance, accuracy and efficiency of data collection, realizes the simultaneous measurement of three-phase electricity, and makes the data collection and analysis intuitive and automatic and networking.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 shows the functional block diagram of the on-line power parameter monitor on the AC side of the photovoltaic power generation system;

Figure 2 shows a circuit diagram of a phase electric energy monitoring dedicated chip CS5463 connected to the grounding switch;

Figure 3 shows the functional block diagram of the regulated power supply.

detailed description

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

Fig. 1 shows a functional block diagram of an online power parameter monitor on the AC side of a photovoltaic power generation system.

As shown in FIG. 1 , an online monitor for power parameters on the AC side of a photovoltaic power generation system includes: a three-phase electric energy measurement circuit module, and a control module connected to the three-phase electric energy measurement circuit module.

The three-phase electric energy measurement circuit module includes:

A power detection chip suitable for measuring the voltage and current parameters of each phase, and a current and voltage acquisition circuit of each phase; the output terminals of the current and voltage acquisition circuits of each phase are respectively connected with the current and voltage input terminals of the power detection chip of the corresponding phase The electric energy detection chips of each phase input the measurement parameters of the corresponding phase wires to the control module; the control module is connected with a display module to display the measurement parameters.

Wherein, the measured parameters include but not limited to instantaneous voltage, current, frequency, instantaneous power, active power, reactive power, apparent power, power factor, and calculated current effective value IRMS and voltage effective value VRMS.

Described control module can adopt but not limited to single-chip microcomputer, embedded chip, DSP chip etc., for example DSP chip TMS320F28035, this DSP chip TMS320F28035, has powerful data calculation ability, comprises high-speed SPI communication module, unique control logic accelerator CLA module, General IO port. Specifically, the DSP chip TMS320F28035 realizes the reading of the power parameter data detected by the three power monitoring chips CS5463 every 10 ms through SPI communication.

The phase current acquisition circuit and the voltage acquisition circuit are suitable for step-down filtering of the phase voltage, the measured AC current is processed into a low voltage signal through resistance sampling, and the processed voltage is sent to CS5463 for measurement.

The electric energy detection chip is, for example but not limited to, the special chip CS5463 for electric energy monitoring. Specifically, the current and voltage input terminals respectively correspond to the VIN+ pin, VIN- pin, IIN+ pin, and IIN- pin of the electric energy monitoring special chip CS5463.

In this technical scheme, the technical scheme of the software design that the DSP chip is connected with the special chip CS5463 for electric energy monitoring is in the paper document: Hunan University in 2007, author Gan Jianping's master's thesis "Research and Design of Multifunctional Electronic Energy Meter Based on CS5463 " has been made public, and will not be repeated here.

Figure 2 shows a circuit diagram of a phase electric energy monitoring dedicated chip CS5463 connected to a grounding switch.

Specifically, as shown in Figure 2, the corresponding current and voltage input terminals of each power detection chip are also suitable for connecting to the grounding switch K, that is, when the grounding switch K is closed, the control module performs numerical correction to avoid prolonged For the problems of zero offset and gain offset caused by the use, on-site zero offset and gain offset calibration operations can be performed. Operation steps for calibrating the instrument: disconnect the external voltage and current, and connect the calibration button. The purpose is to ground all the measured voltage and current ports for calibration.

The chip selection terminal of the control module is respectively connected with the chip selection control terminal of each electric energy detection chip.

The control module is also connected with the RS485 communication module and/or the GPRS wireless module to realize remote, wireless control and data transmission, as well as data communication with the upper computer.

The display module adopts a touch screen to realize instruction input to the control module. Or the control module is connected with a keyboard to realize command input to the control module. Specifically, the display module block can adopt a 128*64 dot-matrix liquid crystal display, and the monitored power parameter content of the display can be selected. According to the monitoring Range setting voltage, current, power measurement scale factor; set single/three-phase measurement type.

The control module is connected with the display module through the chip 74LS164.

Figure 3 shows the functional block diagram of the regulated power supply.

As shown in Figure 3, the on-line monitoring instrument for power parameters on the AC side of the photovoltaic power generation system also includes a regulated power supply with multiple outputs. The voltage stabilizing module, the 5V stabilizing module, and the 3.3V stabilizing module are connected to be suitable for simultaneously outputting 5V and 3.3V DC voltages to meet the power supply needs of each chip in the entire monitor.

Wherein, the 12V voltage stabilizing module can use but not limited to 7812 three-terminal voltage regulator, the 5V voltage stabilizing module can use but not limited to 7805 three-terminal voltage regulator, and the 3.3V voltage stabilizing module can use but not limited to AS1117-33.

Inspired by the above ideal embodiment according to the utility model, through the above description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (6)

1. a photovoltaic generating system AC parameters of electric power on-line computing model, is characterized in that, comprising: three phase electric energy measurement circuit module, the control module be connected with described three phase electric energy measurement circuit module;

Described three phase electric energy measurement circuit module comprises:

Be suitable for the electric energy detection chip measuring each phase voltage, current parameters respectively, and each phase current, voltage collection circuit; The output terminal of described each phase current, voltage collection circuit is connected with the electric current of the electric energy detection chip of corresponding phase, voltage input end respectively, and the measurement parameter of corresponding phase line is inputed to control module by each phase electric energy detection chip respectively;

Described control module is connected with a display module, to show described measurement parameter.

2. photovoltaic generating system AC parameters of electric power on-line computing model according to claim 1, is characterized in that, the sheet choosing end of described control module selects control end to be connected with the sheet of each electric energy detection chip respectively.

3. photovoltaic generating system AC parameters of electric power on-line computing model according to claim 2, it is characterized in that, the phase induced current of described each electric energy detection chip, voltage input end are also suitable for connecting grounding switch, and namely when grounding switch closes, described control module carries out data calibration.

4. photovoltaic generating system AC parameters of electric power on-line computing model according to claim 3, it is characterized in that, described control module is also connected with RS485 communication module and/or GPRS wireless module.

5. photovoltaic generating system AC parameters of electric power on-line computing model according to claim 4, is characterized in that, described display module adopts touch-screen, to realize inputting the instruction of described control module; Or

Described control module is connected with a keyboard, to realize inputting the instruction of described control module.

6. photovoltaic generating system AC parameters of electric power on-line computing model according to claim 5, it is characterized in that, described photovoltaic generating system AC parameters of electric power on-line computing model also comprises the stabilized voltage supply of a multiple-channel output, this stabilized voltage supply comprises: rectification filtering module, be connected with 12V Voltage stabilizing module, 5V Voltage stabilizing module, 3.3V Voltage stabilizing module successively with the output terminal of this rectification filtering module, to be suitable for exporting 5V, 3.3V DC voltage simultaneously.