Isolated grid system stable operation control method based on energy storage unit and load control
An energy storage unit and system stability technology, applied in the field of power grid, can solve problems such as load shedding system, collapse, and the adjustment range of energy storage unit cannot meet a wide range of power fluctuations, so as to achieve the effect of ensuring stability
Active Publication Date: 2019-10-11
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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[0002] Due to the limited primary frequency regulation capability of the isolated power grid system, when the power fluctuates for a short time or is short for a long time, the frequency of the system will fluctuate. If timely safety and stability control is not carried out, large-scale load shedding or even system collapse will occur.
Due to the fast charging and discharging power of energy storage and the simple control method, most isolated grids use energy storage for safe and stable control. However, due to the high cost of energy storage units, and with the increase of system capacity, the adjustment range of energy storage units cannot Meet a wide range of power fluctuations
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[0023] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] In the coordinated control of energy storage and load, when the system frequency is disturbed by power fluctuations, firstly based on the frequency response model, the unbalanced power is calculated through the frequency change rate, and then the power is compensated by using the fast output characteristics of the energy storage unit , but because the operation of the energy storage unit is limited by the state of charge, in order to protect the energy storage from over-discharging and charging, when the state of charge is bel...
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The invention relates to an isolated grid system stable operation control method based on an energy storage unit and load control. When a system frequency is disturbed due to power fluctuation, on thebasis of a frequency response model, imbalance power quantity is calculated through utilization of a frequency change rate; and a power is compensated through utilization of a rapid output characteristic of the energy storage unit. Operation of the energy storage unit is limited by constraint of a charge state, in order to prevent overdisharge and overcharge phenomena occurring in energy storage,when the charge state is smaller than 10% or greater than 90%, work of the energy storage unit is stopped. When the imbalance power is greater than an energy storage adjustment range, the load control needs to be started to stabilize the imbalance power. On the basis of the principle that a load power is influenced by a voltage, load power control is carried out through adjustment of a power supply voltage of a load terminal. On the basis of ensuring normal operation of the load, power adjustment is carried out through continuous adjustment of an operation voltage, so the imbalance power of an isolated grid is stabilized, and stability of the frequency is ensured.
Description
technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a method for controlling the stable operation of an isolated grid system based on energy storage units and load control. Background technique [0002] Due to the limited primary frequency regulation capability of the isolated power grid system, when the power fluctuates for a short time or is short for a long time, the frequency of the system will fluctuate. If timely safety and stability control is not carried out, large-scale load shedding or even system collapse will occur. . Due to the fast charging and discharging power of energy storage and the simple control method, most isolated grids use energy storage for safe and stable control. However, due to the high cost of energy storage units, and with the increase of system capacity, the adjustment range of energy storage units cannot Meet a wide range of power fluctuations. Contents of the invention [0003]...
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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 张亚伟向绪洲张辉胜刘冠中王小龙
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY