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Energy storage unit active support control method and system based on synchronous machine three-order model

A technology of energy storage unit and control method, which is applied in the direction of single-network parallel feeding arrangement, AC network load balancing, etc., and can solve the problem that the inverter does not have inertia characteristics and damping characteristics similar to synchronous generators, grid voltage and frequency. Insufficient support ability and other problems, to achieve the effect of increasing autonomy and immunity, improving frequency stability support ability and voltage stability support ability

Active Publication Date: 2019-11-08
STATE GRID LIAONING ELECTRIC POWER RES INST +3
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Problems solved by technology

[0003] The purpose of the present invention is to provide an active support control method for an energy storage unit based on a three-order model of a synchronous machine, which solves the problem that the inverter of the existing control method does not have the inertia characteristics and damping characteristics similar to the synchronous generator, and the power grid receives Insufficient ability to actively support power grid voltage and frequency when suppressing power fluctuations during disturbances

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[0058] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0059] The energy storage unit active support control method based on the third-order model of the synchronous machine of the present invention, figure 1 It is a schematic diagram of the structure of a new energy power system with energy storage power stations. The system is composed of photovoltaic power stations, wind power generators, battery energy storage power stations, loads and synchronous generators; in order to stabilize microgrid power fluctuations, DC / DC converters on the DC side of the photovoltaic system It adopts high power tracking (MPPT) control, and the photovoltaic grid-connected inverter adopts traditional PQ control to connect to the PCC AC bus. The energy storage unit includes a battery subsystem and an energy management system (BESS). The battery subsystem is composed of multiple battery modules connected in series to achieve a higher vo...

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Abstract

The invention discloses an energy storage unit active support control method and system based on a synchronous machine three-order model. A grid-connected inverter of an energy storage power station simulates a voltage source of a virtual synchronous machine, excitation control and speed regulation control are achieved, necessary inertia and damping characteristics are provided for a power grid system, and stable support of frequency and voltage of a new energy system is achieved. The control method gets rid of traditional phase-locked loop control, so the power angle control of the grid-connected inverter does not change depending on the change of a network frequency, necessary inertia and damping are provided for the new energy system, the autonomy and disturbance rejection of the control of the grid-connected inverter of the energy storage power station are improved, and the grid-connected frequency stability supporting capability and voltage stability supporting capability of the energy storage power station are improved.

Description

Technical field [0001] The invention belongs to the technical field of renewable energy grid-connected technology, and specifically relates to an active support control method and system for an energy storage unit based on a third-order model of a synchronous machine. Background technique [0002] Large-scale grid connection of renewable energy has improved the energy structure and also brought huge challenges to the control and operation of the grid. At this stage, the grid connection of energy storage power plants mainly relies on traditional PQ control, PV control, VF control, droop control and other methods. . First of all, with these methods, the grid-connected inverter ports have almost no inertia characteristics and damping characteristics similar to those of a synchronous generator, and cannot suppress power fluctuations when the grid receives disturbances, and the ability to support grid voltage and frequency is obviously insufficient. . Secondly, due to the intermitte...

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32
Inventor 葛维春葛延峰张艳军那广宇刘闯孙同单锦宁王琛淇
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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