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A DC grid voltage stability control method based on transient power

A control method and voltage stabilization technology, applied in the field of DC grid voltage stability control based on transient power, can solve problems such as weakening DC voltage dynamic stability, low inertia of DC grid, etc., achieve safety and voltage stability margins, and enhance stability Effect of Margin, Stable Voltage Stability Margin

Active Publication Date: 2022-06-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the low inertia of the DC power grid and the negative damping caused by the distributed power supply and the load keeping the power constant for a short time after being disturbed, the dynamic stability of the DC voltage will be weakened.

Method used

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  • A DC grid voltage stability control method based on transient power
  • A DC grid voltage stability control method based on transient power
  • A DC grid voltage stability control method based on transient power

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Experimental program
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Embodiment 1

[0142] The present invention builds the following in the Matlab / Simulink environment. figure 2 The multi-terminal flexible DC grid simulation model shown. The AC grid side uses the power frequency three-phase AC power supply to connect to the VSC after filtering and transforming. 1 The converter is connected to the DC grid, and the capacitor C is connected in parallel dc The voltage across both ends represents the DC bus voltage. The load side is connected to the inverter VSC with constant power control 2 , to ensure that the connected load exhibits constant power characteristics. During the simulation, the wind power generation system is regarded as an equivalent unit. The basic parameters of the simulation model are shown in Table 1.

[0143] Table 1 Model parameters

[0144]

[0145] From equations (7) and (8), it can be known that when the load suddenly decreases, ΔP L CPL CPLmax increase, the system stability is improved and stable operation is maintained; when...

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PUM

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Abstract

The invention discloses a DC grid voltage stability control method based on transient power, establishes a multi-port DC micro-grid model, and obtains droop control equations, system loop voltages, node current equations, and load power equations; according to the multi-port DC micro-grid model Calculate the damping coefficient α and judge whether the damping coefficient α satisfies the specified stability criterion; in the DC voltage droop control, design an improved droop control coefficient, and adjust the power control of the energy storage side converter. Provide additional transient power, thereby increasing the accumulated power on the power supply side and increasing the dynamic stability margin of the system; given the additional power control coefficient k Q , and adjust k Q , so that it satisfies the constraints, so as to ensure that the proposed control can provide positive damping for the system. According to the stability criterion, the invention improves the voltage droop control coefficient of the energy storage converter, so that it can generate constant positive additional transient power on the power supply side, effectively increasing the transient stability margin.

Description

technical field [0001] The invention relates to the technical field of DC power grid transient stability control, in particular to a DC power grid voltage stability control method based on transient electricity. Background technique [0002] The distribution network is an important part of the power system. The distribution network constructed in the form of DC can not only simplify the connection method of the power supply and the load, but also avoid reactive power and frequency problems. Compared with the AC grid, the distributed generation is connected to the DC grid, the conversion device is simplified, the DC-AC inverter link is omitted, and there is no need to pay attention to the frequency fluctuation, reactive power compensation and power angle swing, and the system operation is more stable. Not only that, the increasing demand for DC loads has also promoted the development of flexible DC power grids, and the system operation control technology of DC power grids is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10
CPCH02J1/10
Inventor 付媛李浩张祥宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)