Direct-current power supply unit and relevant photovoltaic inverter testing system
A photovoltaic inverter and DC power supply technology, which is applied to the components of electrical measuring instruments, measuring electrical variables, instruments, etc., can solve the problem that manufacturers cannot correctly test the efficiency of photovoltaic inverters, photovoltaic inverter damage, explosions, etc. question
Active Publication Date: 2014-07-09
致茂电子(苏州)有限公司
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Problems solved by technology
If the photovoltaic inverter is connected to the output terminal of a DC power supply controlled by negative feedback, the aforementioned inductive input impedance characteristics may cause the output signal of the DC power supply to oscillate, and the solar cell array cannot be accurately simulated. characteristics
This may cause the manufacturer to fail to properly test the efficiency of the PV inverter, or cause the PV inverter to be damaged or even explode during the test
Method used
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[0032] figure 1 It is a functional block diagram of an embodiment of the photovoltaic inverter testing system of the present invention. The photovoltaic inverter test system 100 includes a DC power supply 110 and a photovoltaic inverter under test 190 . The DC power supply 110 can simulate a solar cell array, and the test system 100 can be used to test the efficiency of the photovoltaic inverter 190 to be tested.
[0033] The DC power supply 110 can generate a DC analog signal DCS according to a reference signal REF to simulate the DC output signal generated by the solar cell array. The photovoltaic inverter 190 to be tested can generate an AC output signal ACO according to the DC analog signal DCS. Theoretically, the relationship between the AC output signal ACO and the DC analog signal DCS can represent the efficiency of the photovoltaic inverter 190 .
[0034] The DC power supply 110 of this embodiment includes a control module 120 , an output module 140 , a feedback mod...
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The invention discloses a direct-current power supply unit and a relevant photovoltaic inverter testing system. The direct-current power supply unit comprises a control module, an output module, a feedback module and a differential module. The control module generates control signals according to reference signals, feedback signals and differential signals. The output module generates direct-current analog signals according to the control signals. The feedback module generates feedback signals according to the magnitude of the direct-current analog signals. The differential module generates differential signals on time differential according to the direct-current analog signals. The direct-current power supply unit can output stable direct-current analog signals, and damage of a device to be tested cannot be caused easily.
Description
technical field [0001] The present invention relates to a DC power supply, in particular to a DC power supply capable of simulating a solar cell array and a related photovoltaic inverter test system. Background technique [0002] Solar cell (solar cell) is a kind of renewable energy (renewable energy) that is quite popular at present. Generally speaking, the output end of the solar cell array can be connected to a photovoltaic inverter (photovoltaic inverter) to convert the DC power generated by the battery array into AC power. [0003] Manufacturers of photovoltaic inverters often use a DC power supply (DC power supply) to simulate a solar array when conducting tests. For example, a manufacturer uses a DC power supply to generate a DC analog signal, and inputs the DC analog signal to a photovoltaic inverter to test the performance of the photovoltaic inverter. [0004] However, many photovoltaic inverters have the characteristic of inductive input impedance. If the photo...
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IPC IPC(8): G01R31/00G01R1/28
Inventor 刘利伟黄俊渊李明嘉
Owner 致茂电子(苏州)有限公司