Power supply network frequency control method for power electronic energy storage system suitable for fully controlled devices
A frequency control and energy storage system technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of insufficient system damping, reducing system damping, and too fast power supply frequency response, so as to solve the problems of insufficient system damping, Improve the effect of active damping
Active Publication Date: 2020-12-01
RONGXIN HUIKO ELECTRIC TECH CO LTD
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Problems solved by technology
[0003] The control strategy of power electronic energy storage system in the traditional sense, due to the fast response speed, caused the situation that after the frequency change of the power supply network, the power supply frequency response is too fast and the system damping is not enough
[0004] Due to the accelerated development of production capacity, the frequency adjustment problem of the power supply network is becoming more and more prominent, especially in the power supply network of some iron and steel industries, the demand for power supply frequency control is becoming more and more obvious; at the same time, the power electronic generation equipment in the power grid system is becoming more and more Many, while bringing green energy, because the response speed of the fully-controlled power electronic converter is too fast, the damping of the system is reduced, which brings a certain negative impact on the power grid
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[0035] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0036] For the power supply network, frequency control is to adjust the supply of the entire power supply network and maintain the power balance between the generator and the load; for the load side, frequency control refers to adjusting its own load, due to the adjustment of the power supply frequency.
[0037] Such as Figure 1-2 As shown, a power electronic energy storage system power supply network frequency control method suitable for fully controlled devices divides the entire power grid frequency control into four links:
[0038] 1) Power supply network frequency-active damping control loop 2) Power supply network frequency control loop 3) Active power control loop of energy storage equipment 4) Energy storage system residual energy control loop;
[0039] 1) Power supply network frequency-active damping control loop: The p...
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The invention discloses a power electronic energy storage system power supply network frequency control method suitable for a full-control device. The whole power grid frequency control is divided into a power supply network frequency-active damping control loop, a power supply network frequency control loop, an active power control loop of energy storage equipment and an energy storage system residual energy control loop. The power supply network frequency-active damping control loop divides damping into an undamped control mode, a first-order inertia damping mode, a high-order inertia damping mode and a nonlinear damping mode. Power supply network frequency and active power are adopted for closed-loop control, and active damping of a power supply network is improved on the premise of considering energy control of an energy storage system. Residual capacity control of an energy storage system and design of a frequency-active damper are core elements of the control strategy. The residual energy of the energy storage equipment is synthesized to obtain the active current amplitude of the energy storage equipment; and the damping control module is realized by adopting a mode selectionmode. Compared with a traditional frequency-active double-closed-loop control strategy, the problem of insufficient system damping is fundamentally solved.
Description
technical field [0001] The invention relates to the technical field of power electronic energy storage systems, in particular to a method for controlling the frequency of a power supply network of a power electronic energy storage system suitable for fully controlled devices. Background technique [0002] In the current application of energy storage systems, energy storage systems based on fully-controlled power electronic devices occupy most of the market share due to their advantages of mature technology, flexible control structure and small footprint. [0003] The control strategy of the power electronic energy storage system in the traditional sense has a fast response speed, resulting in the situation that after the frequency of the power supply network changes, the power supply frequency responds too fast and the system damping is not enough. [0004] Due to the accelerated development of production capacity, the frequency adjustment problem of the power supply network...
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IPC IPC(8): H02J3/00H02J3/28
CPCH02J3/00H02J3/28
Inventor孙凯何师张海涛鲁挺
OwnerRONGXIN HUIKO ELECTRIC TECH CO LTD