Voltage flicker detecting and control method based on battery energy storage system

A technology for battery energy storage systems and voltage flicker, applied in the field of compensation control, can solve problems such as unsatisfactory effects, inability to effectively suppress voltage flicker, and slow response speed of SVC, and achieve simple algorithm, easy engineering implementation, and suppression of voltage flicker change effect

Inactive Publication Date: 2015-06-10
STATE GRID CORP OF CHINA +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In the compensation method of voltage flicker, the traditional reactive power compensation device SVC has a slow response speed and the effect is not ideal
Using STATCOM to suppress voltage flicker can achieve a better s

Method used

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  • Voltage flicker detecting and control method based on battery energy storage system
  • Voltage flicker detecting and control method based on battery energy storage system
  • Voltage flicker detecting and control method based on battery energy storage system

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Embodiment

[0036] Such as figure 1 Shown is the schematic diagram of voltage flicker compensation using battery energy storage system. From the perspective of power flow, the power absorbed by loads such as electric arc furnaces can be decomposed into two components: a constant (P 0 ,Q 0 ) and fluctuating power (ΔP, ΔQ). In order to solve the voltage flicker problem caused by such loads in the distribution network, the ideal way is to compensate the Q by connecting the BESS at the PCC 0 , ΔP and ΔQ, so that the grid only needs to provide P 0 And its power factor is 1, so that the amplitude and phase angle of the voltage at the PCC are kept constant, and the purpose of suppressing voltage flicker is achieved. Although due to loss and other factors, Q 0 , ΔP and ΔQ cannot be fully compensated, but this will also make the effect of suppressing voltage flicker more ideal.

[0037] Such as figure 2 Shown is the schematic diagram of the voltage flicker detection and compensation method...

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Abstract

The invention provides a voltage flicker detecting and control method based on battery energy storage system; the method comprises the steps: step (1) acquiring a single-phase voltage signal at a PCC (Program-controlled Computer) and changing the phase to obtain three-phase voltage and current signals; step (2), transforming the three-phase voltage and current signals obtained in the step (1) and obtaining instant active power and reactive power; step (3), filtering the obtained instant active power and extracting a DC component to calculate a voltage flicker enveloping signal; step (4) calculating voltage flicker parameters, including an amplitude value and a frequency; and step (5) solving a compensation command of the battery energy storage system and compensating active and reactive power to public nodes. The provided voltage flicker detecting and control method is capable of accurately detecting the corresponding parameters of the voltage flicker; the calculation method is simple and the engineering is easy in realization. The battery energy storage system is applied to a power distribution network to compensate the voltage flicker; in combination of the provided control method, the active and reactive power can be compensated at the same time and the voltage flicker in the power distribution network is restrained effectively.

Description

technical field [0001] The invention relates to a compensation control method, in particular to a voltage flicker detection control method based on a battery energy storage system. Background technique [0002] The irregularity of the load causes the voltage fluctuation of the public access point in the distribution network, and the voltage fluctuation with a frequency between 1-10Hz becomes voltage flicker. Voltage flicker will cause the efficiency of electrical equipment to drop, cause torque and power oscillations, and even affect the protection system, which is relatively harmful to the power grid, so it needs to be detected and compensated. [0003] Currently commonly used voltage flicker detection methods include half-wave effective value method, square demodulation method, full-wave rectification method, etc., but the effects of these methods are not ideal. The synchronization signal detection method based on wavelet multi-resolution decomposition can improve the det...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/10H02J3/12H02J3/18
Inventor 刘赟甲闫涛胡娟渠展展惠东刘伟
Owner STATE GRID CORP OF CHINA
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