Three-phase harmonic wave source

Abstract

The invention relates to a three-phase harmonic wave source, which comprises a single chip microcomputer and a double-port parallel-port RAM (Random Access Memory), and further comprises a hardware clock, a phase-locked loop module, a 16-bit parallel-port CPLD (Complex Programmable Logic Device) counting and scanning module, a first 8-bit parallel-port D / A (Digital-to-Analog) converter, a second 8-bit parallel-port D / A converter, a third 8-bit parallel-port D / A converter and a fourth 8-bit parallel-port D / A converter, wherein the single chip microcomputer is used for writing in waveform data;the double-port parallel-port RAM is connected with the single chip microcomputer; the hardware clock is used for frequency control; the 16-bit parallel-port CPLD counting and scanning module is usedfor scanning the double-port parallel-port RAM in real time; both the first 8-bit parallel-port D / A converter and the second 8-bit parallel-port D / A converter are used for formulating an amplitude value and connected with the high-speed single chip microcomputer; and both the third 8-bit parallel-port D / A converter and the fourth 8-bit parallel-port D / A converter are used for controlling output waveforms and connected with the double-port parallel-port RAM. The output ports of the first 8-bit parallel-port D / A converter and the second 8-bit parallel-port D / A converter are connected with a first operational amplifier array; the output end of the first operational amplifier array is connected with REF (Reference) ports of the third 8-bit parallel-port D / A converter and the fourth 8-bit parallel-port D / A converter; the output ends of the third 8-bit parallel-port D / A converter and the fourth 8-bit parallel-port D / A converter are connected with a second operational amplifier array; and the second operational amplifier array is provided with a harmonic wave output end. The three-phase harmonic wave source provided by the invention has the advantages of high reliability, lower hardware cost and higher working efficiency.

Description

technical field [0001] The invention relates to a three-phase harmonic source. Background technique [0002] Harmonic energy meter verification device is an indispensable equipment in the field of electric energy metering and measurement. Due to the rapid development of the world's industrialization in recent years and the widespread application of electronic power equipment, the proportion of nonlinear loads in the power system has increased year by year, and the problem of power quality in the power system has become increasingly serious. Therefore, the State Grid has strengthened the governance and supervision of harmonics, and introduced a series of standards and policies such as the "State Grid Corporation Grid Power Quality Technical Supervision Regulations". Although the powerful electric energy meter manufacturers in the country have successively launched harmonic electric energy meters, the traceability work cannot be carried out. The difficulty lies in the three-...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the disadvantages of poor reliability, high hardware cost and low work efficiency of existing harmonic sources, the present invention provides a three-phase harmonic source with high reliability, low hardware cost and high work efficiency

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