Measurement synchronization method and system for power electronic equipment

A power electronic device and grid voltage technology, applied in the field of measurement synchronization method and its system, can solve the problems of change or jitter, difficult to achieve effect, thyristor error, etc., and achieve the effect of simple and novel structure, improved overall performance, and easy realization

Active Publication Date: 2016-06-08
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In an ideal power grid, the voltage and current measured by regular sampling are very accurate, but as long as the grid is polluted, especially after the frequency of the grid shifts, there will be errors in the effective values ​​of voltage and current calculated by regular sampling, and the overshoot of the grid voltage will cause

Method used

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  • Measurement synchronization method and system for power electronic equipment
  • Measurement synchronization method and system for power electronic equipment

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Embodiment

[0072] attached figure 2 A specific embodiment of the inventive method is provided, and the main function is realized based on the hardware architecture of DSP+FPGA, and the specific work process is as follows:

[0073] 1) Multi-channel current analog signals (I1~In) and voltage analog signals (U1~Un) are changed into digital AD data and transmitted to FPGA after passing through AD sampling circuit, and the sampling period of AD sampling circuit is controlled by FPGA;

[0074] 2) The FPGA stores the received digital AD data in the internal memory in a certain order, and then notifies the DSP to take the data by generating an interrupt. After the DSP responds to the interrupt, it reads the digital AD data through the internal bus, and follows the communication protocol. The format requires the data to be encapsulated, and finally the data is sent out through the high-speed serial bus (McBSP bus);

[0075] 3) The FPGA internally constructs a digital phase-locked loop to realiz...

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Abstract

The invention relates to a measurement synchronization method and system for power electronic equipment. The method comprises a data transmission method, a period variable sampling method, and a zero-crossing synchronization method. The system is composed of an AD data sampling module, an AD data receiving and storage module, an AD data packaging module, an AD data sending module, a power grid voltage data analysis module, a zero-crossing time calculating module, a synchronous signal sending unit, a phase-locked loop module, a real-time power grid frequency calculation module and a sampling period adjustment module. According to the solution scheme provided by the invention, the structure of the system is simple and novel and the system is suitable for a digital signal processing chip. The method is simple; application is flexible; and the system and the method can be realized conveniently. A power grid frequency can be tracked in real time; and an actual voltage value, an actual current value, and an actual reactive value can be calculated accurately under the circumstance that the power grid frequency fluctuation is large. The method and system have wide application range and can be applied to an FACTS device and can be applied to all pieces of power electronic equipment needing realization of functions of period variable sampling and zero-crossing synchronization.

Description

technical field [0001] The invention relates to a measurement synchronization method and system thereof, in particular to a measurement synchronization method and system of a power electronic device. Background technique [0002] The main features of the modern power system are: ultra-large capacity units, ultra-high voltage or even ultra-high voltage transmission, long-distance power transmission, large-scale AC-DC interconnection grid, high level of automation, market-oriented mechanism, etc. Worldwide, the imbalance of energy and economic development and the development of the electricity market have promoted the interconnection of large-scale power grids, and the interconnection of power grids has formed an increasingly large modern power system. The power system interconnection can realize the optimal utilization of resources in the largest geographical range, and give full play to the networking benefits of large power grid interconnection such as peak shifting and pea...

Claims

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Application Information

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IPC IPC(8): G01R19/25G01R19/175G01R19/06G01R23/02
Inventor 刘慧文杨立詹雄
Owner STATE GRID CORP OF CHINA
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