Control method for stable operation of isolated grid system based on energy storage unit and load control
An energy storage unit and system stability technology, applied in the field of electric power grid, can solve the problems of load shedding system, the adjustment range of energy storage unit cannot meet the large-scale power fluctuation, and the limited primary frequency regulation ability of the isolated power grid system, so as to ensure stability Effect
Active Publication Date: 2020-12-25
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 a stable operation control method of an isolated grid system based on energy storage units and load control. When the system frequency is disturbed by power fluctuations, the unbalanced power amount is first calculated through the frequency change rate based on the frequency response model, and then the energy storage unit is used to calculate the unbalanced power amount. The fast output characteristic of the energy unit compensates for the power. Since 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 below 10% and above 90%, the work of the energy storage unit is stopped; when the state of charge is unbalanced When the power is greater than the adjustment range of the energy storage, it is also necessary to start the load control to stabilize the unbalanced power at this time. Based on the principle that the load power is affected by the voltage, by adjusting the power supply voltage of the load terminal, the load power control is carried out, on the basis of ensuring the normal operation of the load On the one hand, the power is regulated by continuously adjusting its operating voltage, so as to realize the stabilization of the unbalanced power of the isolated grid and ensure the stability of the frequency.
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