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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, applied in AC network to reduce harmonics/ripple, harmonic reduction device, AC network load balancing, etc., can solve the problem of poor harmonic current suppression effect, affecting grid-connected current, etc. problem, to achieve the effect of simplifying the filtering method

Active Publication Date: 2011-07-06
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:

Method used

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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

[0026] 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.

[0027] In this scheme, 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 parameter Kp=2, Kr=1187.5;

[0028] The current harmonic suppression meth...

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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 Applications(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/28
CPCY02E40/40
Inventor 施俊
Owner JIANGSU HOLLY ELECTRIC
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