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SVC optimization control method and device for suppressing DC continuous commutation failure

A technology for optimizing control and commutation failure. It is applied in circuit devices, AC network circuits, flexible AC transmission systems, etc. It can solve the coordination and cooperation of DC system recovery that cannot be considered for dynamic reactive power compensation equipment, and the continuous commutation failure of DC system, etc. problems, to achieve the effect of coordinated recovery and risk reduction

Active Publication Date: 2020-06-26
NARI TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention provides an SVC optimization control method and device for suppressing the failure of DC continuous commutation, which solves the problem that the current SVC mostly adopts a constant voltage control strategy and cannot consider the dynamic reactive power compensation equipment response and The coordination and cooperation of the DC system recovery after the commutation failure, which leads to the problem of continuous commutation failure in the DC system in certain fault scenarios or after the commutation failure occurs

Method used

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  • SVC optimization control method and device for suppressing DC continuous commutation failure
  • SVC optimization control method and device for suppressing DC continuous commutation failure
  • SVC optimization control method and device for suppressing DC continuous commutation failure

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Embodiment 1

[0045] A SVC optimization control method for suppressing DC continuous commutation failure, comprising steps:

[0046] Step 1, when it is detected that the DC control and protection system outputs the first DC commutation failure signal, the control signal CA is optimized through electrical quantity calculation;

[0047] Electrical quantities include: DC system commutation voltage, DC arc extinguishing angle, SVC control voltage reference value;

[0048] The calculation process of the optimized control signal CA is:

[0049] If the formulas (1)~(3) are satisfied at the same time, the optimization control signal CA is 0:

[0050] γ(t)>γ ref (1)

[0051]

[0052]

[0053] Among them, t is the moment, γ(t) is the real-time value of the DC arc extinguishing angle at the moment t, γ ref is the reference value of DC arc extinguishing angle, u ac (t) is the effective value of the DC system commutation voltage detected at time t;

[0054] 2) If the formulas (4) and (5) ar...

Embodiment 2

[0064] Such as figure 1 As shown, taking the CIGRE (International Conference on Large Power Grids) DC system as an example, the simulation is carried out in the electromagnetic transient simulation software PSCAD. A TCR-TSC type SVC is installed at the DC receiving end. The SVC adopts constant voltage control (the voltage reference value is 1.0p.u.). The fault occurs at 3s, and the fault lasts for 0.1s (five cycles).

[0065] Judging that the arc extinguishing angle rises above the reference value at T1, the rate of change of the arc extinguishing angle is greater than 0, the rate of change of the commutation voltage is greater than 0, and the formulas (1) to (3) are satisfied at the same time, the control signal CA is set to 0, which is consistent with the original control The phase sum of the signal KB is 0, and the capacitor is no longer switched; at T2, the commutation voltage drops below the SVC control reference voltage, and the change rate of the commutation voltage is ...

Embodiment 3

[0068] An SVC optimization control device for suppressing DC continuous commutation failure, comprising:

[0069] The optimization control signal CA calculation module is used to optimize the control signal CA through electrical quantity calculation when the DC control and protection system is detected to output the DC first commutation failure signal;

[0070] Electrical quantities include: DC system commutation voltage, DC arc extinguishing angle, SVC control voltage reference value;

[0071] The calculation process of the optimized control signal CA is:

[0072] If the formulas (1)~(3) are satisfied at the same time, the optimization control signal CA is 0:

[0073] γ(t)>γ ref (1)

[0074]

[0075]

[0076] Among them, t is the moment, γ(t) is the real-time value of the DC arc extinguishing angle at the moment t, γ ref is the reference value of DC arc extinguishing angle, u ac (t) is the effective value of the DC system commutation voltage detected at time t;

...

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Abstract

The invention discloses an SVC optimization control method and device for suppressing DC continuous commutation failure, and the method comprises the steps: calculating an optimization control signalCA through electrical quantity when a DC control protection system is detected to output a DC first commutation failure signal; summing the optimization control signal CA with an input signal of an SVC original capacitor control branch to obtain a new input signal of the SVC capacitor control branch; and performing optimal control on switching of the SVC capacitor through a new input signal of theSVC capacitor control branch. According to the invention, the method achieves the optimal control of SVC, can effectively improve the capacity of the system for resisting direct current continuous commutation failure, reduces the risk of direct current continuous commutation failure, and provides a technical thought for safe and stable operation of an alternating current and direct current series-parallel power grid.

Description

technical field [0001] The invention relates to an SVC optimization control method and device for suppressing DC continuous commutation failure, belonging to the technical field of electric power automation. Background technique [0002] HVDC transmission has played an important role in the optimal allocation of resources, but with the continuous increase of power electronic equipment such as DC transmission and new energy, the dynamic reactive power support capacity of the power grid has gradually declined, and the failure of DC commutation has become a problem that affects the safe and stable operation of the power grid. one of the main limiting factors. It has become a common engineering method to configure dynamic reactive power compensation at the DC receiving end to reduce the risk of DC continuous commutation failure. Different types of reactive power compensation equipment such as SVC (static var compensator), STATCOM (static synchronous compensator), and condenser ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/36
CPCH02J3/1821H02J3/36Y02E40/10Y02E60/60
Inventor 雷杰王玉刘福锁李威朱玲张红丽赵学茂张倩赵彦丽
Owner NARI TECH CO LTD
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