System for monitoring photovoltaic battery pack string

Abstract

The invention relates to a system for monitoring a photovoltaic battery pack string and belongs to the field of running and management of a photovoltaic power generation system. In a photovoltaic power station, photovoltaic battery packs are connected in series and then are connected with a header box according to specific conditions, photovoltaic battery pack strings are connected in parallel, and the header box is connected with a grid-connected inverter. When the typical problems of connection, dust accumulation, component obsolescence difference and the like in a photovoltaic battery occur, the efficiency of the photovoltaic power generation system is influenced, and a monitoring system is needed to be arranged in the header box to monitor the photovoltaic battery pack string. The monitoring system can effectively manage the photovoltaic power station by acquiring photovoltaic pack string parameters, and combining other system parameters of the power station to realize autodiagnosis and effectively identify the problem of the power station. The system comprises a singlechip system, a power supply circuit, a voltage detection circuit, a current detection circuit, an intelligent communication interface circuit, an electrical meter chip and the like. In the system, a large-scale integrated circuit is used, and the system has a small volume, is low in energy consumption, has high reliability, and realizes the capacity of continuously monitoring the photovoltaic pack string in the life of the photovoltaic power generation system when assembled in the photovoltaic header box.

Description

Technical field:

[0001] The invention relates to the field of solar photovoltaic power generation, and realizes the measurement and operation management of photovoltaic cell component strings forming a solar photovoltaic cell array in a photovoltaic power station. Background technique:

[0002] The main component of the photovoltaic power generation system is the photovoltaic cell array. In large-scale photovoltaic grid-connected power generation systems, in order to reduce the connection between battery components and grid-connected inverters, the components are effectively combined according to the specific conditions of the power generation system. Generally, 10 to 15 photovoltaic battery components are connected in series and then connected to the confluence. Connect the photovoltaic cell modules in series and parallel into a group through the fuse in the combiner box and the bus bar, and then use the switch to connect the output of the combiner box to the grid-connected...

Examples

Embodiment approach

[0033] Figure 5 , Figure 6 It is an example of an electrical schematic diagram of an implementation case, consisting of a single-chip microcomputer system, a power supply circuit, a voltage detection circuit, a current detection circuit, an optocoupler isolation circuit, a power meter chip, a wireless communication RF circuit, and an antenna.

[0034] The power supply adopts DC or other AC power input provided by photovoltaic module strings, and generates working power through the high-frequency switching power supply module U1 for use by hardware circuits.

[0035] The single-chip microcomputer system U2 adopts the EM351 with SoC structure, which has:

[0036] ●ARM Cortex-M3 core of CPU32Bit

[0037] ● ROM128KB Flash

[0038] ●RAM12KB

[0039] ●A / D12-bit converter

[0040]●UART serial asynchronous interface

[0041] ●R / F excellent coexistence ability with other 2.4GHz devices

[0042] ●PIO parallel interface

[0043] ●Extremely low standby power consumption

[0044...

Technical field:

[0001] The invention relates to the field of solar photovoltaic power generation, and realizes the measurement and operation management of photovoltaic cell component strings forming a solar photovoltaic cell array in a photovoltaic power station. Background technique:

[0002] The main component of the photovoltaic power generation system is the photovoltaic cell array. In large-scale photovoltaic grid-connected power generation systems, in order to reduce the connection between battery components and grid-connected inverters, the components are effectively combined according to the specific conditions of the power generation system. Generally, 10 to 15 photovoltaic battery components are connected in series and then connected to the confluence. Connect the photovoltaic cell modules in series and parallel into a group through the fuse in the combiner box and the bus bar, and then use the switch to connect the output of the combiner box to the grid-connected...

Examples

Embodiment approach

[0033] Figure 5 , Figure 6 It is an example of an electrical schematic diagram of an implementation case, consisting of a single-chip microcomputer system, a power supply circuit, a voltage detection circuit, a current detection circuit, an optocoupler isolation circuit, a power meter chip, a wireless communication RF circuit, and an antenna.

[0034] The power supply adopts DC or other AC power input provided by photovoltaic module strings, and generates working power through the high-frequency switching power supply module U1 for use by hardware circuits.

[0035] The single-chip microcomputer system U2 adopts the EM351 with SoC structure, which has:

[0036] ●ARM Cortex-M3 core of CPU32Bit

[0037] ● ROM128KB Flash

[0038] ●RAM12KB

[0039] ●A / D12-bit converter

[0040]●UART serial asynchronous interface

[0041] ●R / F excellent coexistence ability with other 2.4GHz devices

[0042] ●PIO parallel interface

[0043] ●Extremely low standby power consumption

[0044...

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