Output harmonic suppression method of H-bridge cascaded static synchronous compensator

A static synchronous compensation and harmonic suppression technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc., can solve the problem of low output voltage and current quality of the compensator , the influence of output current, etc.

Pending Publication Date: 2020-10-20
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a method for suppressing output harmonics of an H-bridge cascaded static synchronous compensator to solve the problem of low-frequency voltage affecting the output current on the basis of unipolar frequency multiplier carrier phase shift, and the output voltage of the compensator and problems with lower current quality

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  • Output harmonic suppression method of H-bridge cascaded static synchronous compensator
  • Output harmonic suppression method of H-bridge cascaded static synchronous compensator
  • Output harmonic suppression method of H-bridge cascaded static synchronous compensator

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Embodiment Construction

[0027] With the continuous improvement of the capacity demand of the power system and the requirements of environmental protection and energy saving, the static synchronous compensator (STATCOM), as an important part of the flexible and flexible AC transmission system, has the advantage of improving the transient stability of the grid voltage and compensating for unbalanced Load and filter load harmonics, etc., so it is widely used in power grid hub substations, mines, offshore wind power and electrified railways. But at the same time, it brings a series of related problems. Among them, the power electronic equipment and nonlinear load used by the chain compensator not only bring harmonic pollution to the grid but also affect the power quality. Moreover, the grid voltage is affected by various unpredictable factors, and the real-time fluctuation of the voltage causes the increase of the output harmonic component.

[0028] In order to overcome the influence of low-frequency vol...

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Abstract

The invention discloses an output harmonic suppression method for an H-bridge cascaded static synchronous compensator, and the method sequentially comprises the following steps: adding a voltage feedforward control link on the basis of CPS-SPWM modulation; dividing the average voltage control of each section of direct-current capacitor into average control and balance control; optimizing the modulation performance of the output harmonic suppression of the H-bridge cascaded STATCOM; adding a current decoupling control link; taking a dq-axis component output by the low-pass filter as a referenceinstruction current for PI feedforward decoupling control; controlling the compensation signals to achieve current static-error-free tracking and harmonic treatment. Independent control and trackingof parameters are achieved, the quality of voltage and current output by the compensator is improved, then the output harmonic content of the static synchronous compensator is reduced, and the controlperformance of the static synchronous compensator is optimized.

Description

technical field [0001] The present application relates to the application field of power electronics in power systems, in particular to a method for suppressing output harmonics of an H-bridge cascaded static synchronous compensator. Background technique [0002] With the wide application of power electronic equipment, the harmonic pollution in the power grid is becoming more and more serious. At the same time, the power factor of most power electronic equipment is low, which brings additional reactive load to the grid. Therefore, suppression of harmonics and improvement of power factor have attracted widespread attention. In recent years, with the rapid development of rail transit, the impact of large-capacity single-phase loads represented by traction power supply systems on power quality has become increasingly prominent. Other single-phase loads in the power system, such as single-phase electric arc furnaces, heating devices, etc., will also cause serious power quality...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02J3/1864Y02E40/10Y02E40/40
Inventor 邢超李胜男奚鑫泽徐志何鑫刘明群郭成向川
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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