Energy feedback type electric equipment testing system and method

Abstract

The invention relates to an energy feedback type electric equipment testing system and energy feedback type electric equipment testing method. The testing system comprises an electronic load, a controller, electric equipment and a current and voltage sampling module, wherein the electronic load is in tandem connection with a three-phase alternating current power supply, the electric equipment and the current and voltage sampling module are sequentially connected to the input end of the electronic load, the electric equipment is in parallel connection into the three-phase alternating current power supply, the controller is connected with the current and voltage sampling module and the electronic load respectively, and the electronic load comprises a rectifier module used for generating current and an inverter module used for energy feedback. The electronic load can be used for really simulating various limiting conditions in a power grid and used for detecting the influence of various reactive current, active current and harmonic current in the power grid on the electric equipment encountered by the electric equipment, through detection, on one hand, the optimizing and updating of the electric equipment are facilitated, and on the other hand, the defects brought by utilizing a ring opening testing manner in the prior art are also overcome.

Description

Technical field [0001] The invention relates to the technical field of power quality testing in power transmission and distribution systems, and in particular to an energy feedback type electrical equipment testing system and method. Background technique [0002] At present, a large number of electric power appliances, civil appliances, and nonlinear loads are connected to the power grid, causing a large amount of reactive current and harmonic current to be injected into the power grid. The working environment of the power grid is complicated, mutual influence and interference. These effects have not only caused a great increase in power transmission loss of the grid, but also caused various electrical equipment to work abnormally. On the other hand, the existing electrical equipment can only use simulation or reasoning to test the harmonic current of the electrical equipment. , The working state in the reactive current environment, and how much reactive current and harmonic curr...

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Problems solved by technology

[0002] At present, a large number of electrical appliances, household electrical appliances and nonlinear loads are connected to the power grid, causing a large amount of reactive current and harmonic current to be injected into the power grid. The working environment of the power grid is intricate, interacting and interfering

These effects not only cause a great increase in power grid transmission loss, but also make various electrical equipment work abnormally. On the other hand, the existing electrical equipment can only use simulation or reasoning to test electrical equipment in harmonic current , The working state in the reactive current environment, but how much reactive current and harmonic current will cause damage to the electrical equipment in practice, there is no way to pay attention

[0003] In the prior art, there are also electronic loads used to simulate power grid quality and test electrical equipment. This type of electronic load mainly adopts an open-loop test method, that is, a single variable is used. Other parameters are rated. Some properties of electrical equipment or the secondary circuit of the equipment are tested, for example, only the content of harmonic current in the system is tested, or only the three-phase unbalance degree in the system is tested, etc. In the above tests, the harmonic current and the three-phase Phase unbalance is a single variable, while other power factors are within the rated range

However, in power transmission and distribution systems, factors such as harmonic current, power factor, and three-phase current imbalance often coexist. The detection and monitoring results of the above methods are too ideal, and the detected data are difficult to meet the actual needs of the power distribution system. It is more difficult to truly simulate the live operating environment of the power distribution system

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