Method, system and medium for phase generator constant voltage control coordinated with reactive voltage control of UHV DC converter station

A UHV DC and voltage control technology, applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve the problems of failing to give full play to the dynamic adjustment function of the condenser and the voltage fluctuation of the AC system, so as to suppress the failure of DC commutation, The effect of quick recovery of voltage and improvement of sensitivity

Active Publication Date: 2022-03-11
STATE GRID HUNAN ELECTRIC POWER +2
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  • Claims
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Problems solved by technology

At present, the voltage switching value is generally set at 5% U n Deviation, mostly from the consideration of serious faults in the DC near area to prevent commutation failure, for failure to cause voltage deviation exceeding 5% U n The voltage fluctuation of the AC system cannot respond, and the dynamic adjustment function of the condenser cannot be fully exerted. Among them, U n To control the rated voltage of the bus voltage, generally 525kV

Method used

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  • Method, system and medium for phase generator constant voltage control coordinated with reactive voltage control of UHV DC converter station

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Embodiment Construction

[0050] see figure 1 In this embodiment, the implementation steps of the method for controlling the fixed voltage of the generator coordinated with the reactive power voltage control of the UHV DC converter station include:

[0051] 1) Detect the switching commands of the filter bank, capacitor bank and reactor bank issued by the DC control and protection system; when it is detected that the DC control and protection system sends out the switching command of the filter bank or capacitor bank, jump to step 2);

[0052] 2) Calculate the deviation ΔU between the estimated target voltage and the initial voltage target after a small filter bank / capacitor bank is put into use c1 ;

[0053] 3) Delay the specified time ΔT to wait for the filter bank / capacitor bank to stabilize and jump to the next step;

[0054] 4) According to the deviation ΔU between the estimated target voltage and the initial voltage target c1 Correct the voltage control target Uref of the condenser (i+1) , adj...

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Abstract

The invention discloses a method, system and medium for constant voltage control of phase modulation coordinated with reactive power and voltage control of an ultra-high voltage direct current converter station. The following steps: Calculate the deviation between the estimated target voltage and the initial voltage target after a small filter bank / capacitor bank bank is put into operation; after a delay for a specified time, correct the voltage control target of the camera according to the deviation between the estimated target voltage and the initial voltage target , adjust the steady-state reactive power output of the camera to zero or a specified value whose difference from zero is less than the preset threshold. The invention does not need to change the internal control logic of the existing DC control and protection system, and can simplify the control mode of the camera from a double-loop control mode to a single-loop control mode, and can simply and effectively coordinate the control of the camera and the AC filter group controlled by the DC control and protection system. , capacitors and reactors, give full play to the dynamic adjustment ability of the camera.

Description

technical field [0001] The present invention relates to power system operation and control technology, in particular to a method, system and medium for adjusting phase constant voltage control coordinated with the reactive power voltage control of UHV DC converter stations, which are used to realize UHV converters considering the current control status. Coordinated control of voltage / reactive power between the condenser in the flow station and the AC filter bank controlled by the DC control and protection system. Background technique [0002] The HVDC transmission system based on voltage commutation uses a large number of semi-controlled devices, which may cause commutation failure and consume a large amount of reactive power when the system is disturbed or faulty. In the receiving end system with weak feed-in AC system strength and poor voltage recovery characteristics, it is usually considered to install a dynamic reactive power compensation device to improve the system op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor 洪权吴晋波宋军英李辉李理郭思源朱维钧欧阳帆严亚兵徐浩李刚臧欣梁文武许立强刘志豪尹超勇王善诺肖纳敏
Owner STATE GRID HUNAN ELECTRIC POWER
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