A fault-tolerant control method for a DC energy dynamic regulator

A dynamic adjustment and fault-tolerant control technology, applied in the direction of DC network circuit device, circuit device, power transmission AC network, etc., can solve the deterioration of control performance, affect the calculation accuracy of the number of input sub-modules, and cannot adapt to incomplete bypass fault units. and other problems to achieve the effect of reducing switching frequency, reducing loss, and reducing voltage fluctuations

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +1
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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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  • A fault-tolerant control method for a DC energy dynamic regulator
  • A fault-tolerant control method for a DC energy dynamic regulator
  • A fault-tolerant control method for a DC energy dynamic regulator

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no. 1 example

[0045] The first embodiment of the present invention is applied to the occasion 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 chart controls the normal sub-modules. Control is implemented as follows:

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

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

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

[0049] Step 4: According to the sum U of the nor...

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Abstract

The invention discloses a fault-tolerant control method for a DC energy dynamic adjustment device. The steps are: collecting DC voltage, device current and normal sub-module voltage, recording the number of normal sub-modules; calculating the sum of the normal sub-module voltages and its command value; Calculate the total power and power adjustment amount of the normal sub-modules; calculate the number of sub-modules that need to be invested; implement a sorting and voltage-equalizing algorithm for the normal sub-modules to generate switching signals for each sub-module. This control method can avoid the influence of the incomplete bypass fault module on the calculation of the number of input sub-modules, and realize the precise control of 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 power electronic converters, 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 the HVDC energy, and plays a key role in the application scenario of the islanded power supply in the flexible DC transmission system. Especially when the power generation end is an inertial power source similar to wind power, when the power receiving end fails, since 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 referred to as a DC chopper or a dynamic braking system. [0003] Most of the existing DC energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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