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Smart Energy Meter Dynamic Error Test Device

A smart energy meter, dynamic error technology, applied in measuring devices, measuring electrical variables, instruments, etc., can solve problems such as dynamic error of energy meters

Active Publication Date: 2017-12-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of comprehensive testing of the dynamic error characteristics of intelligent electric energy meters, electronic electric energy meters and inductive electric energy meters, to solve the method of generating pseudo-random test excitation current and power, and to convert the dynamic load electric energy value to the steady-state load electric energy In order to solve the problem of traceability of the value, a test device for the dynamic error of the smart energy meter was invented

Method used

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  • Smart Energy Meter Dynamic Error Test Device
  • Smart Energy Meter Dynamic Error Test Device

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specific Embodiment approach 1

[0033] Specific implementation mode one: the following combination figure 1 This embodiment will be described. The intelligent electric energy meter dynamic error testing device described in this embodiment, it adopts the synchronous circuit (1) of three-phase voltage and / or three-phase current to generate synchronous pulse; Synchronous pulse input synchronous pseudo-random sequence control signal generation circuit (2), in Under the control of the pseudo-random sequence selection circuit (3), a pseudo-random sequence control signal is selected from various pseudo-random sequence control signals to output, and the pseudo-random sequence control signal is output to the dynamic load power control circuit (4) of the electric energy meter to generate Pseudo-randomly changing multi-mode dynamic load current and dynamic load power output, and generate steady-state voltage output. The input of the dynamic load power control circuit (4) of the electric energy meter is the steady-stat...

specific Embodiment approach 2

[0035] Specific implementation mode two: the following combination figure 1 Describe this embodiment, this embodiment is a further description of Embodiment 1, the synchronous pseudo-random sequence control signal s(t) described in this embodiment is:

[0036]

[0037] In the formula, t represents time, T is the period of power frequency fundamental wave voltage or current; a(k) is a pseudo-random sequence with value "1" or "0", k=0,1,2,3...belong to natural numbers The set N of; c(t-kT) is the control signal level function:

[0038] k∈N, t represents time, V is the control level, the unit is volt.

[0039] The pseudo-random sequence is an M sequence, an m sequence, a truncated m sequence, a balanced Gold sequence, a Gold sequence, and a truncated Gold sequence, and one of the pseudo-random sequences can be selected under the control of the pseudo-random sequence selection circuit (3).

[0040] The steady-state voltage produced by the dynamic load power control circuit (4...

specific Embodiment approach 3

[0045] Specific embodiment three: this embodiment is a further description to embodiment one and mode two, the cumulative time method of the test electric energy meter dynamic load power control circuit (4) output power described in this embodiment is: when the electric energy meter under test is When the dynamic load current and power are input, the dynamic error test unit (5) of the electric energy meter is at the set N p Between the output pulses of the measured electric energy meters, the cumulative time T of measuring the pseudo-random sequence a(k) is "1" Σ (1), measure the accumulated time T when a(k) is "0" at the same time Σ (0), where: T 2i+1 Indicates the time when each segment of a(k) is "1" continuously; T 2i Indicates the time when each segment of a(k) is "0" continuously, i=0,1,2,3...N', N' is a positive integer;

[0046] The dynamic error measurement algorithm described in this embodiment is

[0047] When the number of pulse signals output by the measur...

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Abstract

A dynamic error testing device for an intelligent electric energy meter, which consists of a synchronous circuit for three-phase voltage and / or three-phase current, a synchronous pseudo-random sequence control signal generation circuit, a pseudo-random sequence selection circuit, a dynamic load power control circuit for electric energy meters, and a dynamic load power control circuit for electric energy meters. Composed of error test unit, display and keyboard unit, and dynamic error measurement algorithm; it can effectively generate multi-mode pseudo-random test excitation current and power, effectively reflect the randomness of dynamic load current and power changes, and realize pseudo-random dynamic load changes The traceability of the electric energy value to the steady-state load electric energy value realizes the comprehensive test of the dynamic error characteristics of the electric energy meter under the multi-mode test excitation; solves the randomness problem that the current deterministic test excitation current and power cannot reflect the dynamic load change; It solves the problem of traceability and dynamic error test of dynamic load electric energy value under pseudo-randomly changing dynamic load; it has a wide range of applications in the dynamic error test system of smart electric energy meters.

Description

technical field [0001] The invention relates to a dynamic error testing device for an intelligent electric energy meter, in particular to a dynamic error testing device for an intelligent electric energy meter, an electronic electric energy meter and an inductive electric energy meter, which can generate pseudo-random test excitation current and power. Background technique [0002] At present, dynamic loads in known smart grids are gradually increasing. On the one hand, distributed energy sources such as solar power, wind power, and biomass energy are introduced into the grid, making the power supply in the grid unstable. On the other hand, electrified railways, steel-making electric arc furnaces, rolling mills and large charging stations are widely used, and there are more and more dynamic loads in the power grid, resulting in a large increase in the measurement error of the electric energy meter under dynamic load. However, at present, the production, testing and verifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/04
Inventor 王学伟王琳温丽丽贾晓璐
Owner BEIJING UNIV OF CHEM TECH
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