Broadband Harmonic Instability Analysis Method, Device, Equipment and Medium of Distributed Power Station

Abstract

The invention discloses a distributed power station broadband harmonic instability analysis method, device, equipment and medium. The method includes: obtaining system power station component parameters, grid-connected inverter control strategy and control parameters; according to the system power station component parameters and grid-connected Based on the inverter control strategy, the equivalent frequency-domain impedance model of the distributed power station is established; according to the equivalent frequency-domain impedance model of the distributed power station, when the grid-connected inverter side and the grid side act separately, the current flow to the public coupling point transfer function; the transfer function is processed by the Pade approximation method to solve the system zero-pole distribution, and the system zero-pole distribution diagram is drawn; according to the system zero-pole distribution diagram, the system harmonic instability analysis is performed. The invention can accurately judge the system stability without losing the characteristics of the distributed parameters, and accurately locate the potential broadband harmonic instability domain of the system, and can provide preventive measures and guidance for harmonic control in advance in the initial stage of distributed power station construction.

Description

technical field

[0001] The invention relates to the technical field of power grid harmonic analysis, in particular to a distributed power station broadband harmonic instability analysis method, device, equipment and medium. Background technique

[0002] In recent years, distributed power generation represented by wind power and photovoltaic power generation has developed rapidly. For these new energy power plants, grid-connected inverters play an important role in transmitting clean energy to the grid, but grid-connected inverters will generate broadband and high-order harmonics. When the equivalent impedance of each electrical component of a distributed power station is coupled within a wide frequency range, the system may experience broadband harmonic instability. In particular, when distributed power plants are connected to weak grids through long lines or cables, the distribution parameters of the lines can easily cause harmonic amplification or even instability. [00...

Examples

Embodiment 1

[0118] Such as Figure 1 to Figure 5 As shown, the present invention distributed power plant broadband harmonic instability analysis method, such as figure 1 shown, including the following steps:

[0119] Step S1: Obtain system power station component parameters, grid-connected inverter control strategies and control parameters; the system power station component parameters include grid-connected inverter side parameters and grid-side parameters; the grid-connected inverter side parameters include inverter Transformer side inductance, grid side inductance, filter capacitor, filter parasitic impedance, PI control loop, proportional gain, phase locked loop PI control loop, triangular wave secondary value, current side voltage, sampling frequency, number of inverters and single inverter Transformer capacity; the grid-side parameters include grid voltage, grid inductance, main transformer rated voltage, main transformer rated capacity, main transformer short-circuit voltage ratio...

Embodiment 2

[0173] Such as Figure 1 to Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a distributed power station broadband harmonic instability analysis device, which supports the distributed power station broadband harmonic instability analysis method described in Embodiment 1, Such as Image 6 As shown, the device includes:

[0174] The acquisition unit is used to acquire system power station component parameters, grid-connected inverter control strategies and control parameters;

[0175] The transfer function derivation unit is used to establish the equivalent frequency domain impedance model of the distributed power station according to the system power station component parameters, the grid-connected inverter control strategy and the control parameters; according to the distributed power station equivalent frequency domain impedance model, deduce and The transfer function of the current to the point of common coupling (...

technical field

[0001] The invention relates to the technical field of power grid harmonic analysis, in particular to a distributed power station broadband harmonic instability analysis method, device, equipment and medium. Background technique

[0002] In recent years, distributed power generation represented by wind power and photovoltaic power generation has developed rapidly. For these new energy power plants, grid-connected inverters play an important role in transmitting clean energy to the grid, but grid-connected inverters will generate broadband and high-order harmonics. When the equivalent impedance of each electrical component of a distributed power station is coupled within a wide frequency range, the system may experience broadband harmonic instability. In particular, when distributed power plants are connected to weak grids through long lines or cables, the distribution parameters of the lines can easily cause harmonic amplification or even instability. [00...

Examples

Embodiment 1

[0118] Such as Figure 1 to Figure 5 As shown, the present invention distributed power plant broadband harmonic instability analysis method, such as figure 1 shown, including the following steps:

[0119] Step S1: Obtain system power station component parameters, grid-connected inverter control strategies and control parameters; the system power station component parameters include grid-connected inverter side parameters and grid-side parameters; the grid-connected inverter side parameters include inverter Transformer side inductance, grid side inductance, filter capacitor, filter parasitic impedance, PI control loop, proportional gain, phase locked loop PI control loop, triangular wave secondary value, current side voltage, sampling frequency, number of inverters and single inverter Transformer capacity; the grid-side parameters include grid voltage, grid inductance, main transformer rated voltage, main transformer rated capacity, main transformer short-circuit voltage ratio...

Embodiment 2

[0173] Such as Figure 1 to Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a distributed power station broadband harmonic instability analysis device, which supports the distributed power station broadband harmonic instability analysis method described in Embodiment 1, Such as Image 6 As shown, the device includes:

[0174] The acquisition unit is used to acquire system power station component parameters, grid-connected inverter control strategies and control parameters;

[0175] The transfer function derivation unit is used to establish the equivalent frequency domain impedance model of the distributed power station according to the system power station component parameters, the grid-connected inverter control strategy and the control parameters; according to the distributed power station equivalent frequency domain impedance model, deduce and The transfer function of the current to the point of common coupling (...

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