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Method for inhibiting harmonic wave of energy-storage grid-connected three-phase voltage source transformer of storage battery

A three-phase voltage and harmonic suppression technology, which is applied in the AC network to reduce harmonics/ripples, harmonic reduction devices, AC network load balancing, etc., can solve the problem of poor harmonic current suppression, affecting grid-connected current, etc. problem, to achieve the effect of simplifying the filtering method and good suppression effect

Active Publication Date: 2013-11-06
JIANGSU HOLLY ELECTRIC
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Problems solved by technology

[0006] In order to solve the problem in the prior art that the harmonic current suppression effect of the three-phase voltage source converter of the battery energy storage system is poor and affects the grid-connected current, the invention provides a current The harmonic suppression method, the specific scheme is as follows: a harmonic suppression method for a battery energy storage grid-connected three-phase voltage source converter, which is characterized in that it includes the following steps:

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  • Method for inhibiting harmonic wave of energy-storage grid-connected three-phase voltage source transformer of storage battery
  • Method for inhibiting harmonic wave of energy-storage grid-connected three-phase voltage source transformer of storage battery
  • Method for inhibiting harmonic wave of energy-storage grid-connected three-phase voltage source transformer of storage battery

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Embodiment 1

[0027] Such as figure 1 , 2 , 3, the method circuit of the present invention includes a high-pass filter 26, an inductive reactance 5, an IGBT switch tube 14, a DC side bus capacitor 4, a storage battery 1 and a cable inductive reactance 21, as figure 2 As shown, in addition to the battery energy storage system being connected to the grid through a converter, there is also a 100Kw uncontrolled rectifier 31 as a load and generating current harmonics.

[0028] In this solution, the charging reference power is set to 0, the DC bus capacitance is 400uF, the battery SOC state is 50%, the ambient temperature is 25°C, the battery internal resistance is 0.3418Ω, the battery open circuit voltage is 720V, the cable resistance is 0.001Ω, the cable reactance is 10e‐6H, the switch Frequency 15KHz, current PI regulator Kp_i=2.4Ki_i=28.5, power PI regulator Kp_p=0.00136, Ki_p=20.4, proportional resonance PR controller parameters Kp=2, Kr=1187.5;

[0029] The current harmonic suppression m...

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Abstract

The invention discloses a method for inhibiting a harmonic wave of an energy-storage grid-connected three-phase voltage source transformer of a storage battery, which relates to the technical field of power grid in power industry. The method comprises the following steps of: acquiring signals of a voltage and a current of a three-phase power grid; converting the signals into two phases of fixed-axis variables serving as feedback quantities through Clark transformation and Park transformation; simultaneously calculating charging power; comparing feedback power with reference power; performing proportion integration (PI) regulation, and obtaining a reference voltage by comparing the feedback power and the reference power with two phases of feedback voltage values and performing the PI regulation; obtaining a required fixed coordinate system voltage of a three-phase current converter after performing the Clark transformation and the Park transformation; obtaining a harmonic current from the voltage by using a high-pass filter; transforming the harmonic current into a two-phase rotating coordinate system; and obtaining a harmonic compensation value by using a proportion resonance (PR) controller. By the method, a current harmonic wave generated by the current transformer can be inhibited in a targeted way; and half of proportion resonant controllers can be saved compared with a conventional proportion resonance control algorithm.

Description

Technical field: [0001] The invention relates to electric grid-connected technology in the electric power industry, in particular to a method for controlling and suppressing low-order current harmonics of a battery energy storage grid-connected three-phase voltage source converter system designed for grid stability. Background technique: [0002] With the continuous development of global new energy technologies, especially the increasing development and utilization of wind energy and solar energy, after the above-mentioned electric energy is integrated into the grid, the energy flow of the grid has fluctuated, which poses a great challenge to the stability of the grid. Challenge, in order to make the power grid more stable and strong, there is an urgent need for a device to play the role of peak-shaving and valley-filling power grid energy. Now developed countries in Europe and the United States have begun research on power grid energy storage systems. With the huge wind energ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/28
CPCY02E40/40
Inventor 施俊
Owner JIANGSU HOLLY ELECTRIC
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