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A corner-type statcom based on grid voltage feed-forward control and its control method

A grid voltage and feed-forward control technology, applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, etc., can solve problems such as poor performance of STATCOM current control, and achieve the effect of improving performance

Active Publication Date: 2020-02-21
XJ ELECTRIC +2
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Problems solved by technology

[0007] The object of the present invention is to provide a kind of angle-type STATCOM and its control method based on grid voltage feedforward control, in order to solve the feedforward control based on the feedforward item of grid voltage phase angle compensation under grid transient state, make STATCOM current control poor performance

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  • A corner-type statcom based on grid voltage feed-forward control and its control method
  • A corner-type statcom based on grid voltage feed-forward control and its control method

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.

[0039] Embodiment of the angle-type STATCOM control method based on grid voltage feed-forward control of the present invention:

[0040] Below, the present invention will be described in detail by taking the step-down angle type chain STATCOM as an example, as figure 1 As shown, the structure diagram of the main loop of the step-down angle chain STATCOM is as follows figure 1 As shown, it is mainly composed of step-down transformer, in-corner connected reactance and commutation chain. Angle-type chain STATCOM generally adopts a phase-splitting control strategy to independently control the three phases.

[0041] For the AB phase, a single-phase phase-locked loop is used to phase-lo...

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Abstract

The invention relates to an angle-type STATCOM based on feedforward control of power grid voltage and a control method of the angle-type STATCOM. The control method comprises steps of superposing output quantity of a feedforward controller on the output quantity of a current inner ring, and judging whether the power grid is in a steady state or in a transient state before the STATCOM is unlocked; if the power grid is in the steady state, using a feedforward item based on power grid voltage phase angle compensation as the output quantity of the feedforward controller, and after a control system is stable, switching to take the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller; and if the power grid is in the transient state, using the feedfoward item based on direct acquisition of power grid voltage as the output quantity of the feedforward controller. According to the invention, it can be achieved that the impact current is smallest during unlocking under the condition that the power grid is in the steady state; based on the feedforward item of the power grid voltage, true conditions of the power grid voltage can be well reflected under the condition that the power grid is in the transient state; the smaller the sampling delay time of the power grid voltage is, the smaller the delay time of the control system is; and excellent current control performance can be acquired. Thus, by combining advantages and avoiding the disadvantages of two kinds of the feedforward items, the performance of the STATCOM is improved.

Description

technical field [0001] The invention belongs to the technical field of flexible alternating current transmission, and in particular relates to an angle-type STATCOM based on grid voltage feed-forward control and a control method thereof. Background technique [0002] In recent years, with the advancement of power electronic switching technology and the increasing maturity of the application of modern control theory, the Static Synchronous Compensator (STATCOM) in reactive power compensation technology has gradually emerged. STATCOM has multiple functions such as compensating system inductive and capacitive reactive power, improving system power factor, improving power intelligence, and improving power system stability. It is an important member of Flexible AC Transmission Systems (FACTS). STATCOM is equivalent to a controllable reactive power source. Its reactive current can quickly follow the change of load reactive current, automatically compensate the reactive power requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCH02J3/18Y02E40/10
Inventor 刘刚孙健高志军左广杰许恩泽刘海舰臧兴平卢海亮
Owner XJ ELECTRIC
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