Multi-level frequency modulation coordination control method and system for multi-level direct current transmission system with high proportion of hydropower

A technology of coordinated control system and external transmission system, applied in the direction of power transmission AC network, circuit devices, electrical components, etc., can solve the problems of seldom considering DC FC, and not considering the difference between the frequency modulation characteristics of hydropower units, so as to avoid The effect of slow frequency recovery and faster system frequency modulation ability

Active Publication Date: 2022-02-01
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing methods mainly focus on the direct coordination of conventional water / thermal power, new energy and AGC, less consideration is given to the coordination of DC FC, and no research has been considered to optimize the PID parameters of some unit governors for suppressing ultra-low frequency oscillations. Differences between features

Method used

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  • Multi-level frequency modulation coordination control method and system for multi-level direct current transmission system with high proportion of hydropower
  • Multi-level frequency modulation coordination control method and system for multi-level direct current transmission system with high proportion of hydropower
  • Multi-level frequency modulation coordination control method and system for multi-level direct current transmission system with high proportion of hydropower

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Embodiment 1

[0044] This embodiment proposes a multi-level frequency modulation coordinated control method for a high proportion of hydropower multi-DC external transmission system.

[0045] Such as figure 1 As shown, the control method of this embodiment includes the following steps:

[0046] 1) Classify the units in the network according to their frequency modulation resource characteristics and their control areas, such as optimized units, non-optimized units, and thermal power units.

[0047] 2) When a grid disturbance accident occurs, calculate the theoretical action value of the i-th DC FC (i=1...n, n is the number of DCs with the FC function enabled):

[0048]

[0049] Among them, s is the differential operator, K i is the proportional gain coefficient of the i-th DC FC, T i is the inertial time constant of the i-th DC FC, Δf is the system frequency deviation, is the action dead zone of the i-th DC FC.

[0050]3) Determine the actual amount of action in the actual working s...

Embodiment 2

[0060] This embodiment proposes a multi-level frequency modulation coordinated control system for a high proportion of hydropower and multiple direct current transmission systems.

[0061] Such as figure 2 As shown, the control system of this embodiment includes a detection module, a calculation module and a control module.

[0062] The detection module of this embodiment is used to calculate the theoretical action value of the i-th DC FC when a grid disturbance accident is detected i=1,...,n, n is the number of DCs with FC function enabled, and the actual action amount of the i-th DC FC is obtained based on the calculated theoretical action amount

[0063] In this embodiment, the following formula is used to calculate the theoretical action amount of the i-th DC FC

[0064]

[0065] Among them, s is the differential operator, K i is the proportional gain coefficient of the i-th DC FC, T i is the inertial time constant of the i-th DC FC, Δf is the system frequency...

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Abstract

The present invention discloses a multi-stage frequency modulation coordination control method and system for a high proportion of hydropower multi-direct current transmission system. The method of the present invention includes step S1, when a power grid disturbance accident is detected, the theoretical action value i of the i-th direct current FC is calculated =1,...,n, n is the number of DCs with the FC function enabled, and based on the calculated theoretical action, the actual action of the i-th DC FC is obtained Step S2, based on the actual action of n DC FCs, calculate the sub-center The unbalanced power in the control area; step S3, distributing the unbalanced power to the corresponding generator sets according to different generator types. The present invention can avoid the problem of slow frequency recovery caused by DC FC reversion by introducing the adjustment value of DC FC in AGC control.

Description

technical field [0001] The invention belongs to the technical field of electric power system security and stability control, and in particular relates to a multi-level frequency modulation coordination control method and system for a high proportion hydropower multi-direct current transmission system. Background technique [0002] With the change of grid interconnection structure, provincial and regional power grids have changed from synchronous interconnection to asynchronous interconnection. Taking the Southwest Power Grid as an example, after the asynchronous Internet, the installed capacity of hydropower accounts for about 70% of the total installed capacity of the entire network. Hydropower, under the typical operation mode, the proportion of hydropower output exceeds 90%. At the same time, the proportion of 7 DC transmissions exceeds 50%, which is a typical power system with high proportion of hydropower and multiple DC transmissions. The drastic changes in grid struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/46H02J3/36H02J3/24
CPCH02J3/48H02J3/466H02J3/36H02J3/24Y02E60/60
Inventor 陈刚史华勃范成围王曦刘畅苗树敏曾奕
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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