Control system and method of direct current load system in response to frequency modulation requirement of power grid in manner of intervals

A DC load and control system technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as increasing system complexity, and achieve the effect of suppressing the drop and suppressing the increase of the grid frequency

Active Publication Date: 2018-07-20
NANJING INST OF TECH
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Problems solved by technology

However, in addition to electric vehicles and power grids, V2G technology still requires a third-party communication dispatching center, which increases the complexity of the system

Method used

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  • Control system and method of direct current load system in response to frequency modulation requirement of power grid in manner of intervals
  • Control system and method of direct current load system in response to frequency modulation requirement of power grid in manner of intervals
  • Control system and method of direct current load system in response to frequency modulation requirement of power grid in manner of intervals

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with accompanying drawing:

[0027] Figure 1-4 It is the main circuit structure diagram, control block diagram, and inter-regional frequency modulation schematic diagram of the control system for the DC load system of the present invention to respond to the grid frequency regulation between partitions; it includes the main circuit system and the control system; the main circuit includes a rectifier module, a DC / DC module and a DC load ;The control system includes rectifier control, DC / DC control, and DC voltage droop control; through the DC load voltage droop control, the system can perform inter-regional frequency modulation, and the working mode includes constant voltage operation, boost frequency modulation, step-down frequency modulation, and undervoltage protection And five operating modes of overvoltage protection; Figure 5 Control flow chart when responding to grid frequency regulation f...

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Abstract

The invention discloses a control system and method of a direct current load system in response to a frequency modulation requirement of a power grid in a manner of intervals. The system comprises a main circuit system and a control system, the main circuit system comprises a rectification module, a DC / DC module and a direct current load, the control system comprises rectifier control, DC / DC control and direct current voltage droop control, the system performs frequency modulation in the manner of intervals through voltage droop control of the direct current load, and the work mode comprises five operation modes including constant-voltage operation, boosted frequency modulation, voltage-reduction frequency modulation, under-voltage protection and overvoltage protection. According to the system and method, the terminal voltage of the direct current load and the frequency of the power grid are coupled, a rectifier load participates in a frequency modulation process of the power grid as much as possible in the condition of satisfying safe operation and basic operating requirements so that the stability of the power grid can be improved, the control method is simple, the circuit structure is clear, the operation is flexible, the response is rapid, and the application value is good.

Description

technical field [0001] The invention belongs to the technical fields of rectifier load control and power grid frequency regulation, and in particular relates to a control system and method for enabling a DC load system to participate in power grid frequency regulation. Background technique [0002] In a conventional grid dominated by synchronous machines, ordinary loads do not need to participate in grid frequency regulation control. However, with the continuous development of the trend of power electronics in power systems, large-scale intermittent power supplies and a large number of controllable loads are connected to the power grid through converters, and the rotational inertia of conventional power grids is gradually reduced. In order to maintain the stability of the system, it is required Intermittent power supplies and controllable power loads, which account for an increasing proportion, are gradually participating in the frequency regulation process of the power grid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 熊连松宋汉梁
Owner NANJING INST OF TECH
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