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Fault-tolerant control method of direct-current energy dynamic adjusting device

A dynamic adjustment and fault-tolerant control technology, which is applied in the direction of DC network circuit devices, circuit devices, power transmission AC networks, etc., can solve the problem of affecting the calculation accuracy of input sub-modules, inability to adapt to incomplete bypass fault units, and deterioration of control performance and other issues, to achieve the effect of reducing switching frequency, reducing losses, and reducing voltage fluctuations

Active Publication Date: 2021-04-20
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the traditional control method, the voltage involved in the calculation of the number of input sub-modules is the DC bus voltage, and the information of the normal sub-module voltage is not used. This is feasible under the fault handling measures of completely bypassing the faulty module, but when there is a partial bypass Or when there is only a sub-module with a communication failure that is not bypassed, it will inevitably affect the accuracy of the calculation of the number of input sub-modules and deteriorate the control performance
[0006] Therefore, the existing control method cannot adapt to the situation that there is an incomplete bypass fault unit in the device, and it is necessary to propose a new control method that is compatible with the incomplete bypass fault submodule

Method used

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  • Fault-tolerant control method of direct-current energy dynamic adjusting device
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  • Fault-tolerant control method of direct-current energy dynamic adjusting device

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no. 1 example

[0045] The first embodiment of the present invention is applied to occasions where the voltage sampling accuracy of the normal sub-module of the DC energy dynamic adjustment device is relatively high. The main controller of the DC energy dynamic adjustment device adopts image 3 The control flow diagram implements control for normal sub-modules. Control is implemented in the following steps:

[0046] Step 1: Collect the DC voltage U dc , The current I of the DC energy dynamic adjustment device chp ; Collect normal sub-module voltage U SMact_i (The subscript i represents the i-th submodule, 0act ); and record the number of normal sub-modules N act .

[0047] Step 2: Change the normal sub-module voltage U SMact_i Sum to get the sum of the normal sub-module voltage U dcact .

[0048] Step 3: Follow the Figure 5 Calculate the command value U of the sum of normal sub-module voltages dcactref , where U dcref for a given constant U dccmd .

[0049] Step 4: According to ...

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Abstract

The invention discloses a fault-tolerant control method of a direct-current energy dynamic adjusting device. The method comprises the following steps: acquiring direct-current voltage, device current and normal sub-module voltage, and recording the number of normal sub-modules; calculating the sum of the voltages of the normal sub-modules and an instruction value thereof; calculating the total power and the power regulation quantity of the normal sub-modules; calculating the number of sub-modules needing to be input; and implementing a sorting voltage-sharing algorithm on the normal sub-modules to generate switching signals of the sub-modules. The control method can avoid the influence of an incomplete bypass fault module on the calculation of the number of input sub-modules, and achieves the precise control of the energy consumption power and DC voltage in a fault-tolerant state.

Description

technical field [0001] The invention belongs to the technical field of high-power electric current conversion, and in particular relates to a control method of a DC energy dynamic adjustment device. Background technique [0002] In the flexible DC transmission system, the DC energy dynamic adjustment device is often used to realize the dynamic dissipation or adjustment of high-voltage DC energy, and plays a key role in the application scenario where the flexible DC transmission system has island power supply. Especially when the power generation end is an inertial power source similar to wind power, when the power receiving end fails, because the power cannot be sent out, energy will be accumulated on the DC side, causing the voltage of the DC transmission line to rise, threatening the safe operation of the equipment . In many occasions, the DC energy dynamic adjustment device is also called a DC chopper (DC chopper) or a dynamic braking system (dynamic braking system). ...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60
Inventor 孙乐谢晔源姜田贵姚宏洋
Owner NR ELECTRIC CO LTD
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