Alternating current and direct current coordination control method improving system stability

A technology for AC-DC coordination and system stability, which is applied in the direction of reducing flicker in AC networks, reducing/preventing power oscillation, etc., can solve problems such as observability, feedback signal limitations, and limited effects, so as to improve transient stability and dynamic The effect of stabilizing the level, suppressing the swing of the power angle, and reducing the cutting amount

Active Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +4
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  • Description
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Problems solved by technology

[0004] The traditional local stability control measures are mostly power system stabilizers PSS, which can suppress low-frequency oscillations in a specific operating mode. limited role

Method used

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  • Alternating current and direct current coordination control method improving system stability
  • Alternating current and direct current coordination control method improving system stability
  • Alternating current and direct current coordination control method improving system stability

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Embodiment Construction

[0021] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings of the description.

[0022] The AC-DC coordinated control method for improving system stability disclosed by the present invention, its flow chart is as attached figure 1 As shown, it specifically includes the following steps: (1) When an AC fault occurs in the power grid at the sending end, start the AC-DC coordinated control.

[0023] (2) Perform low-pass filtering and direct blocking processing on the tie line power.

[0024] (3) In step (2), the curve is fitted using a quadratic polynomial. fit a curve to y=ax 2 The quadratic polynomial of +bx+c, specific steps: all data points will not fall on the fitting curve, if the kth point falls on the fitting curve, then the coordinates of the kth point satisfy the quadratic curve equation, that is :

[0025] the y k =ax k 2 +bx k +c

[0026] Among them, a, b, c are undetermined co...

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Abstract

The invention discloses an alternating current and direct current coordination control method improving the system stability, and belongs to the field of electric power system operation control. The method comprises the steps of carrying out quadratic polynomial curve fitting on the power of a connecting line after smoothing and stopping are carried out on the power of the connecting line under the condition that an alternating current and direct current series-parallel power grid goes wrong, judging whether the power increase condition or the power decrease condition is met and then increasing or decreasing the direct current power. Meanwhile, the effect is more remarkable with cooperation with an additional PSS4B excitation controller. According to the alternating current and direct current coordination control method, the regional power balance relation in the swinging process of a generator set can be effectively controlled, power angle swinging can be restrained, generator tripping can be reduced, and the transient stability level and the dynamic stability level of an alternating current and direct current system can be increased.

Description

technical field [0001] The invention belongs to the field of power system operation control, in particular to an AC-DC coordination control method for improving system stability. Background technique [0002] As more and more high-power direct current transmissions are concentrated in the load center, the huge scale and rapid control response capability of direct current transmission have brought a series of complex and profound impacts on the dynamic characteristics, stability risks and control methods of the power grid. Variety. The active power range of the DC transmission system is large, the adjustment speed is fast, and it has the ability of short-term and continuous overload, so that the rapid power modulation of the DC transmission system provides a new and effective method for improving the transient stability margin of the AC-DC hybrid power grid. means of control. Through the rapid and emergency modulation of DC power, the power balance relationship between regi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/002H02J3/24
Inventor 姚秀萍李晖常喜强时伯年赵明君邱富东王衡瞿艳霞郭小龙张锋
Owner STATE GRID CORP OF CHINA
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