Stability evaluation method and system for multi-machine multi-node power generation system

A power generation system, multi-node technology, applied in AC networks to reduce harmonics/ripples, harmonic reduction devices, single-grid parallel feeding arrangements, etc.

Active Publication Date: 2019-12-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of criterion is originally applicable to simpler systems
For complex systems such as multi-machine and multi-node power generation systems, it is impossible to directly use basic stability criteria for stability evaluation.
Since there is currently no stability assessment method based on impedance networks for multi-machine multi-node power generation systems, there is an urgent need in this field for a method that can analyze the generation mechanism of harmonic oscillations in multi-machine multi-node power generation systems and accurately evaluate multi-machine multi-node power generation systems. Method and system for power generation system stability

Method used

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  • Stability evaluation method and system for multi-machine multi-node power generation system

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Embodiment 1

[0067] figure 1 It is a flow chart of an embodiment of the method for evaluating the stability of a multi-machine multi-node power generation system in the present invention. see figure 1 , the stability assessment method of the multi-machine multi-node power generation system includes:

[0068] Step 101: Perform power flow calculation on the multi-machine multi-node power generation system to obtain the voltage amplitude, phase and power of each node in the steady-state operation state of the multi-machine multi-node power generation system.

[0069] Step 102: According to the voltage amplitude, phase and power of the nodes, calculate the steady-state control signals of the converters connected to each node and the steady-state harmonic content of the electrical parameters, and obtain the steady-state control signals of each converter And the steady-state harmonic content of electrical parameters.

[0070] This step 102 specifically includes:

[0071] According to the pow...

Embodiment 2

[0089] figure 2 It is a structural diagram of an embodiment of the stability evaluation system of the multi-machine multi-node power generation system of the present invention. see figure 2 , the stability evaluation system of the multi-machine multi-node power generation system includes:

[0090] The power flow calculation module 201 is used to perform power flow calculation on the multi-machine multi-node power generation system, and obtain the voltage amplitude, phase and power of each node in the steady-state operation state of the multi-machine multi-node power generation system.

[0091] The steady-state harmonic content calculation module 202 of steady-state control signals and electric parameters is used to calculate the steady-state control signals and electric parameters of the converters connected to each node according to the voltage amplitude, phase and power of the nodes The steady-state harmonic content of the steady-state control signal of each converter an...

Embodiment 3

[0110] image 3 It is a structural diagram of the new energy power generation system of a wind farm in western China. see image 3 , the new energy power generation system of the wind farm includes aggregate wind turbine inverter 1, SVG (static var compensation device) 2, equivalent impedance of transmission line 3, public large power grid 4, bus bars #1 to 5 at all levels and transformers T1 at all levels ~T3. There are multiple converters in the new energy power generation system of the wind farm.

[0111] Figure 4 It is a flow chart of the stability assessment method for wind farm new energy power generation system. see Figure 4 , the stability assessment method of the new energy power generation system of the wind farm includes:

[0112] Step 401: Perform power flow calculation on the new energy power generation system of the wind farm to obtain the voltage amplitude, phase and power of each node in the steady state operation state of the new energy power generatio...

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Abstract

The invention discloses a stability evaluation method and system for a multi-machine multi-node power generation system. The method comprises the steps of carrying out power flow calculation, and calculating a steady-state control signal of a converter connected with each node and the steady-state harmonic content of an electric parameter according to the obtained voltage amplitude, phase and power of each node in a steady-state operation state; establishing the impedance of each converter considering a frequency coupling effect, and substituting the steady-state control signal and the steady-state harmonic content of the electric parameter to obtain the impedance considering the frequency coupling effect under a specific working condition; connecting the impedance considering the frequency coupling effect and the impedance of a passive element under all specific working conditions according to network topology to obtain a network node admittance matrix, and further obtaining equivalent network impedance aggregated to a set node; and applying a stability criterion to the equivalent network impedance aggregated to the set node to evaluate the system stability. According to the invention, the generation mechanism of the harmonic oscillation of the multi-machine multi-node power generation system can be analyzed, and the stability of the multi-machine multi-node power generation system can be accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of power generation systems, in particular to a method and system for evaluating the stability of a multi-machine multi-node power generation system. Background technique [0002] Almost all renewable energy sources are connected to the AC grid through grid-connected inverters, and a dynamic interconnection system is formed between various converters and the grid. Unexpected dynamic interaction effects. [0003] For an ideal power generation system, all parameters in the power generation system are fixed. According to a reasonable design, the control system of the generator set can have high stability, and there is no harmonic oscillation in the power generation system. However, in the actual power grid, due to the influence of parameters such as transmission lines, the grid impedance cannot be ignored, and the interaction between various converters (wind turbine inverters, static var compensation devices) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01Y02E40/40
Inventor 张旸孙龙庭陈新龚春英陈杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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