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Energy control circuit and method

An energy control and circuit technology, applied in circuit devices, DC network circuit devices, electrical components, etc., can solve the problems of high cooling system requirements, difficult device voltage equalization, high equipment cost, etc., and achieve the effect of maintaining balanced operation

Active Publication Date: 2019-12-13
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, circuit 1 uses a switch connected in series with a resistor, such as image 3 As shown, the switch is a valve composed of power electronic devices in series, and the adjustment of the power consumption of the resistor is realized by controlling the opening and closing of the valve by pulse width modulation (PWM). This circuit has the characteristics of simple structure and easy control; but when the DC voltage After rising to a certain level, the increase in the number of power electronic devices will make it difficult to equalize the device voltage. Due to the use of pulse width modulation, the consistency of action of all power electronic devices cannot be guaranteed; therefore, this control circuit is suitable for low voltage field
Circuit 2 has a modular design on the basis of circuit 1, such as Figure 4 As shown, the switches and resistors are distributed in each module, and the voltage equalization of the modules is realized by the module capacitors, and the power consumed by the circuit is controlled by controlling the number of module switches that are turned on; the circuit has a simple control method and is not affected by DC The advantage of voltage limitation is that the disadvantage is that the resistors that consume energy are placed in the module, which will increase the module volume and the building area of ​​the valve hall, and have high requirements for the cooling system.
Compared with circuit 1, the improvement of circuit 3 is that the switching valve adopts modular multilevel converter (MMC) modules in series, such as Figure 5 As shown, the modular multilevel converter module can adopt a full-bridge or half-bridge structure, and the module voltage equalization can be realized by charging and discharging the capacitor of the modular multilevel converter module. When the control circuit operates, the modular multi-level converter The flat converter module does not need to be switched at the same time, so the circuit is not limited by the DC voltage and can be applied to high-voltage projects; the disadvantage of the circuit is that the control method is complicated and the equipment cost is high

Method used

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Embodiment 1

[0081] The present invention provides an energy control circuit, the circuit structure is as figure 1 As shown, the system connected to the circuit is a direct current transmission power system, and the energy control circuit is connected in parallel with the inverter converter station; the improvement is that the method includes the following steps:

[0082] (1) The energy control circuit consists of the main resistor R m , energy control module and inductor L m Composition in series;

[0083] (2) The maximum power consumed by the energy control circuit is determined by the main resistor R m Decide;

[0084] (3) The minimum number of energy control modules is determined by the withstand voltage capability of the main switch and the DC line voltage;

[0085] (4) Auxiliary resistor resistance R a It is jointly determined by the maximum value of energy absorbed by the energy control circuit and the number of energy control modules;

[0086] (5) By changing the auxiliary r...

Embodiment 2

[0129] Taking a DC project as an example, the project rated DC voltage U dc =±320kV, the energy control circuit adopts an asymmetric layout, and the maximum power consumed by the energy control circuit is P max =900MW, the main resistance value R can be obtained m_usy =455Ω; the withstand voltage capacity of the main switch of the energy control module is U m_e =3kV, the minimum number N of energy control modules m_min_usy =213.33, the actual design value N of the energy control module m =240; the minimum power absorbed by the energy control circuit is P min =200MW, auxiliary resistance R a_usy =6.64Ω; energy control module main switching device K m The turn-on current withstand capability of The point minimum value L can be obtained m_min_usy =0.32mH, the design value of inductance L m =1mH; if the power consumed by the required energy control circuit is 300MW, the number of auxiliary resistors to be input is 137; if the power consumed by the required energy control ...

Embodiment 3

[0131] This embodiment provides an energy control method, including:

[0132] Determine whether the energy control circuit is activated based on the energy consumption demand power;

[0133] When no input is required, the control energy control module is disconnected;

[0134] When input is required, determine the number of energy control circuits that need to be input according to the energy consumption demand and input them into the circuit for voltage division, consume energy together with the main resistor, and short-circuit the remaining energy control modules to the in the circuit.

[0135] The control energy control module is disconnected, including:

[0136] Turn off the main switch and auxiliary switch in the energy control module.

[0137] The determination of whether the energy control circuit is put into operation based on the energy consumption demand power also includes:

[0138] determining the minimum number of energy control modules according to the withst...

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Abstract

The invention discloses an energy control circuit and method. The circuit is connected in parallel with a receiving end converter station and then is connected to a DC power transmission line. The circuit comprises a main resistor and a plurality of energy control modules. The main resistor and the plurality of energy control modules are sequentially connected in series; the main resistor is usedfor providing main power for energy consumption of the energy control circuit; the energy control modules are used for controlling the switching of the energy consumption power of the circuit; and each energy control module is used for conducting circuit voltage division and providing auxiliary power for controlling the energy consumption of the circuit. The energy control circuit provided in thescheme comprises the energy control module, and the energy control module can control the energy consumption power in the circuit when the DC system operates normally or disturbance and faults occur,so that whether the whole circuit is put into operation or not is controlled, and balanced operation of the whole DC power transmission system is maintained.

Description

technical field [0001] The invention relates to the field of direct current transmission energy transfer, in particular to an energy control circuit and method. Background technique [0002] The direct current transmission line can efficiently and conveniently transmit a large amount of electric energy from the energy base to the load center. The structure diagram of the direct current transmission line is shown in figure 2 As shown, for a DC power transmission project in operation, the electric energy consumed by the receiving end is balanced with the electric energy generated by the sending end, and the voltage and operating frequency of the power grid at the sending end remain constant. When the power system at the receiving end is disturbed or fails and cannot absorb the electric energy sent by the sending end, the voltage and frequency of the sending end power grid will be disturbed, and this disturbance can be reduced by quickly adjusting the output of the generator; i...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J1/14
CPCH02J1/00H02J1/14Y02E60/60
Inventor 张静高冲贺之渊赵岩许彬王成昊袁荔王航王治翔
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD