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A controllable broadband grid impedance measuring device and its measuring method

A technology of grid impedance and measuring devices, which is applied in the direction of impedance measurement, measuring devices, and measuring electrical variables, etc., can solve problems such as the difficulty of implementing impedance methods, and achieve the effect of increasing reactive power and reducing active power loss

Active Publication Date: 2021-11-02
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] The following problems exist in the grid impedance measurement process: First, due to the complexity of the grid system, such as the wide coverage area of ​​the social grid and the large number of devices in the grid, it is difficult to directly calculate the impedance; secondly, for the impedance measurement of the grid, only need Record the required voltage and current signals at the measurement point, without knowing other parameters of the whole network

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  • A controllable broadband grid impedance measuring device and its measuring method
  • A controllable broadband grid impedance measuring device and its measuring method
  • A controllable broadband grid impedance measuring device and its measuring method

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Embodiment Construction

[0026] Such as figure 1 , a controllable broadband grid impedance measurement device, which consists of a single-pole three-throw switch B, a circuit breaker C, a power electronic device D, a current transformer E, a voltage transformer G, a digital signal processor H (DSP), a touch display Screen K and other components.

[0027] Among them, A is the simulated three-phase low-voltage distribution network, which is the energy source of the device and the measurement object of the device.

[0028] The touch display screen K is used as a human-computer interaction interface to realize the input of the entire device command, the control of the internal switch and the display of the measurement result.

[0029] The single-pole three-throw switch B can control the opening and closing of the whole device and realize the conversion between measuring single-phase power grid or three-phase power grid.

[0030] Circuit breaker C enables switching of measurements within the unit. When ...

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Abstract

The invention discloses a controllable broadband grid impedance measuring device and a measuring method thereof. In the measuring device, one output end of the current transformer is connected to the emitter of the first IGBT and the collector of the third IGBT through the circuit breaker, and the other output end is connected to the emitter of the second IGBT and the collector of the fourth IGBT; The collector of the first IGBT and the collector of the second IGBT are respectively connected to both ends of the first resistor, and the emitter of the third IGBT and the emitter of the fourth IGBT are respectively connected to both ends of the second resistor; the first resistor and The second resistance is also connected in parallel with the first capacitor and the second capacitor respectively; the first output end of the Chirp-PWM signal generator is connected to the gates of the first IGBT and the second IGBT, and the second output end is connected to the third IGBT and the fourth The gate of the IGBT; also includes the signal processor. The invention can realize one-time broadband impedance measurement of each phase of the three-phase four-wire low-voltage distribution network, and the measurement range can be set; through the design of resistance and capacitance parameters, the reactive power of harmonics can be increased and the active loss of resistance can be reduced .

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a controllable broadband grid impedance measuring device and a measuring method thereof. Background technique [0002] In recent years, with the maturity of power electronic technology, more and more power electronic devices have been applied to the power system, forming a new power system with power electronics. The integration of large-scale power electronic devices will change the dynamic characteristics of the power grid in the time domain and frequency domain. At the same time, long-distance, large-capacity DC transmission and the construction of electrified railways will cause frequent oscillation and stability problems in the power system. [0003] In order to predict the stability of the system, study the harmonic penetration characteristics of the power grid, select the design parameters of the power grid filter, and avoid the occurrence of circuit resonance to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/08G01R27/16
CPCG01R27/08G01R27/16
Inventor 林颖陈羽航郭辰宇林雨眠汪冠宇胡海涛
Owner SOUTHWEST JIAOTONG UNIV
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