CN-115800258-B - Method and device for switching power supply in source network charge storage integrated industrial park

CN115800258BCN 115800258 BCN115800258 BCN 115800258BCN-115800258-B

Abstract

The application provides a switching method and a switching device of power supplies in a source network charge storage integrated industrial park, wherein the switching method comprises the steps of establishing a simulation model of a transient state of a power grid of the source network charge storage integrated industrial park; the method comprises the steps of simulating accident tripping of production load of an industrial park under different working conditions in a simulation model, obtaining a multi-stage bus phase angle difference characteristic curve and a multi-stage bus frequency difference characteristic curve, determining a target power supply switching device for switching a corresponding switching switch of a bus based on multi-stage bus quick switching logic in the simulation model when any bus in a plurality of buses loses power, and determining a target accident switching mode used by the target power supply switching device from preset accident switching modes according to a power supply quick switching fixed value so that the target power supply switching device switches the controlled switching switch based on the target accident switching mode. By the method and the device, the success rate of rapid switching of the power supply in the source network charge storage integrated industrial park is improved.

Inventors

YANG ZAIXIN
TAO JUN
YIN BAIQING
A Minfu
LIU XIAOKAI

Assignees

内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司

Dates

Publication Date: 20260505
Application Date: 20221129

Claims (10)

1. The switching method of the power supply in the source network charge storage integrated industrial park is characterized by comprising the following steps of: Establishing a simulation model of a source network load storage integrated industrial park power grid transient state according to load distribution, load types, an energy storage control system and actual parameters of the industrial park, wherein the simulation model comprises a generator, an energy storage power station, a transformer substation bus, a plurality of buses with different voltage levels, power supply switching devices corresponding to each bus, a switching switch controlled by each power supply switching device and a comprehensive load model; Based on the comprehensive load model and the primary structure of the industrial park power grid, accident tripping of the production load of the industrial park under different working conditions is simulated in the simulation model, transient response characteristics of rapid switching of each bus power supply are tested, and a multi-stage bus phase angle difference characteristic curve and a multi-stage bus frequency difference characteristic curve are obtained; when any bus in the plurality of buses is powered off by the incoming line power supply, determining a target power supply switching device for switching a switching switch corresponding to the bus in the simulation model based on a multi-stage bus rapid switching logic; Determining a power supply quick switching fixed value according to a preset accident switching mode, the multi-stage bus phase angle difference characteristic curve and the multi-stage bus frequency difference characteristic curve, wherein the power supply quick switching fixed value comprises quick switching start time delay, a quick cutting angle difference fixed value, a quick cutting frequency difference fixed value, a front-over angle difference fixed value and a front-over frequency difference fixed value, and the preset accident switching mode comprises a quick switching mode and a front-over switching mode; And determining a target accident switching mode used by the target power switching device from the preset accident switching modes according to the power quick switching fixed value, so that the target power switching device switches the controlled switch based on the target accident switching mode.
2. The switching method according to claim 1, wherein the determining, in the simulation model, the target power switching device for switching the corresponding switch of the bus based on the multi-stage bus fast switching logic includes: Determining a current-stage power supply switching device for controlling a switching switch connected with the bus in the simulation model; Determining a next-stage bus positioned at the next stage of the bus in the simulation model, and determining a next-stage power switching device for controlling a switching switch connected with the next-stage bus; And determining the current stage power switching device and the next stage power switching device as the target power switching device.
3. The switching method according to claim 1, wherein the switching success condition corresponding to the fast switching mode is that the frequency difference is less than 2Hz, and the switching time of the standby power supply is less than 50 ms; the switching success condition corresponding to the previous switching mode is that the frequency difference is smaller than 5Hz, and the switching-on time of the standby power supply is larger than 50 milliseconds and smaller than 200 milliseconds.
4. A switching method according to claim 3, characterized in that the fast cut angle difference constant and the fast cut frequency difference constant of the power supply fast switch constant are determined according to the fast switch mode by: Determining a cross point between the position of the abscissa 50ms and the frequency difference characteristic curve of the multi-level bus according to the frequency difference characteristic curve of the multi-level bus; If the frequency difference of the cross point is smaller than 2Hz, the fast cutting critical point is the cross point, and the fast cutting frequency difference fixed value is the frequency difference corresponding to the cross point; if the frequency difference of the cross point is larger than 2Hz, the fast-cutting critical point is the cross point between the 2Hz position of the ordinate and the frequency difference characteristic curve of the multistage bus, and the fast-cutting frequency difference fixed value is the frequency difference corresponding to the fast-cutting critical point; and determining the minimum phase angle difference of the voltages of the multiple buses at the fast cutting critical point according to the multi-stage bus phase angle difference characteristic curve, and determining the minimum phase angle difference as the fast cutting angle difference fixed value.
5. A switching method according to claim 3, characterized in that the forward angular difference constant and the forward frequency difference constant of the power supply fast switching constant are determined according to the forward switching mode by: according to the multi-stage bus frequency difference characteristic curve, a cross point between the position of the abscissa of 200ms and the multi-stage bus frequency difference characteristic curve is obtained; If the frequency difference of the crossing point is smaller than 5Hz, the crossing point is the critical point before, and the frequency difference fixed value before is the frequency difference corresponding to the crossing point; If the cross point frequency difference is larger than 5Hz, the front critical point is the cross point between the position of the ordinate 5Hz and the multi-stage bus frequency difference characteristic curve, and the front frequency difference fixed value is the frequency difference corresponding to the front critical point; And obtaining the minimum phase angle difference of the voltages of the plurality of buses at the front critical point according to the multi-stage bus phase angle difference characteristic curve, and determining the minimum phase angle difference as the front angle difference fixed value.
6. A switching method according to claim 3, characterized in that the fast switching start delay in the power fast switching constant is determined by: In the multi-level bus phase angle difference characteristic curve, a transient drop recovery point is determined according to the quick cut angle difference fixed value and the angle difference curve; and determining an abscissa value corresponding to the transient drop recovery point in the multi-stage bus phase angle difference characteristic curve as the quick switching start delay.
7. The switching method according to claim 1, wherein determining a target accident switching pattern from the preset accident switching patterns according to the power supply fast switching constant value comprises: acquiring a current angular difference value and a current frequency difference value of a bus corresponding to the target power supply switching device; When the current frequency difference value is smaller than or equal to the previous frequency difference fixed value and the current angle difference value is smaller than or equal to the previous frequency difference fixed value, determining the previous switching mode as the target accident switching mode; And when the current frequency difference value is smaller than or equal to the quick cut angle difference fixed value and the current angle difference value is smaller than or equal to the quick cut angle difference fixed value, determining the quick switching mode as the target accident switching mode.
8. The utility model provides a switching device of power in source network lotus stores up integrated industrial park, its characterized in that, switching device includes: The system comprises a model building module, a power supply switching device and a comprehensive load model, wherein the model building module is used for building a simulation model of a source network, load and storage integrated industrial park power grid transient state according to load distribution, load types, an energy storage control system and actual parameters of an industrial park, and the simulation model comprises a generator, an energy storage power station, a transformer substation bus, a plurality of buses with different voltage levels, the power supply switching device corresponding to each bus, a switching switch controlled by each power supply switching device and the comprehensive load model; The characteristic curve determining module is used for simulating accident tripping of the production load of the industrial park under different working conditions in the simulation model based on the comprehensive load model and the primary framework of the industrial park power grid, testing the transient response characteristic of the rapid switching of each bus power supply and obtaining a multi-stage bus phase angle difference characteristic curve and a multi-stage bus frequency difference characteristic curve; The target power supply switching device determining module is used for determining a target power supply switching device for switching a corresponding switching switch of any bus based on multistage bus rapid switching logic in the simulation model when the incoming line power supply is lost; The power supply rapid switching fixed value determining module is used for determining a power supply rapid switching fixed value according to a preset accident switching mode, the multi-stage bus phase angle difference characteristic curve and the multi-stage bus frequency difference characteristic curve, wherein the power supply rapid switching fixed value comprises rapid switching start time delay, a rapid cutting angle difference fixed value, a rapid cutting frequency difference fixed value, a front-going angle difference fixed value and a front-going frequency difference fixed value, and the preset accident switching mode comprises a rapid switching mode and a front-going switching mode; and the target accident switching mode determining module is used for determining a target accident switching mode used by the target power switching device from the preset accident switching modes according to the power quick switching fixed value so that the target power switching device switches the controlled switching switch based on the target accident switching mode.
9. An electronic device comprising a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory in communication via the bus when the electronic device is in operation, the machine-readable instructions being executable by the processor to perform the steps of the method of switching power sources in a source network load storage integrated industrial park as claimed in any one of claims 1 to 7.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program when executed by a processor performs the steps of the method for switching power sources in a source network charge storage integrated industrial park according to any one of claims 1 to 7.

Description

Method and device for switching power supply in source network charge storage integrated industrial park Technical Field The application relates to the technical field of power systems, in particular to a switching method and a switching device of a power supply in a source network charge storage integrated industrial park. Background Along with the national energy transformation and the 'double carbon' targets, the construction of a novel power system mainly based on new energy is accelerated to the power industry, and an industrial park power grid becomes a part of the novel power system. The industrial park faces green transformation upgrading, the industrial park containing self-contained power plants needs to be configured with distributed energy sources such as wind power, photovoltaics, energy storage and the like in a certain proportion, the power supply structure of the traditional industrial park is changed, and the industrial park power grid develops to a novel power system with strong nonlinearity, multiple time scales, high-dimensional multi-coupling and dynamic system characteristics. On the other hand, the industrial park load (electrolytic aluminum, ferroalloy, electric arc furnace and the like) belongs to high energy consumption load, the load occupies a proportion and has complex characteristics, the load frequently fluctuates along with the wide participation of an energy storage system in peak clipping and valley filling and rapid frequency modulation and the influence of renewable energy access with strong randomness and volatility on production, and a large economic loss is easily caused by interrupting power supply of a secondary important load, however, the regulation and control mode of energy storage in the existing industrial park is single, the energy storage cannot be timely regulated under large disturbance, and if the power utilization reliability of the important load and the stability of bus voltage can possibly cause great economic loss. The fast switching of the standby power supply or the operation bus power supply is used as a key measure for guaranteeing the power supply of important loads, and the position of the standby power supply or the operation bus power supply in the coordinated operation of the source network and the charge storage of an industrial park is increasingly important. When the power grid in the industrial park breaks down to cause the power failure of the bus at the working section, the power supply rapid switching device adopts an accident switching power supply mode to switch the standby power supply or the operation bus to the power failure bus, and the power supply rapid switching device is classified according to the switching speed of the standby power supply and can be classified into rapid switching, forward phase angle switching (synchronous capturing switching), residual voltage switching and the like, and voltage switching is carried out by utilizing the characteristics of the voltage difference, the angle difference and the frequency difference of the voltage of the standby power supply or the operation bus and the residual voltage of the power failure bus. The rapid switching of the power supply is an important electrical operation in the stages of plant power on-off, load switching, rapid power control and fault handling of the energy storage converter, and how to improve the success rate of the rapid switching of the power supply has important significance for stable production and safe operation of large enterprises in industrial parks. Disclosure of Invention Therefore, the application aims to provide a switching method and a switching device for power supplies in a source network charge storage integrated industrial park, which improve the success rate of synchronous switch-on of a switch and further improve the success rate of rapid switching of the power supplies in the source network charge storage integrated industrial park. In a first aspect, an embodiment of the present application provides a method for switching power sources in a source network load storage integrated industrial park, where the switching method includes: Establishing a simulation model of a source network load storage integrated industrial park power grid transient state according to load distribution, load types, an energy storage control system and actual parameters of the industrial park, wherein the simulation model comprises a generator, an energy storage power station, a transformer substation bus, a plurality of buses with different voltage levels, power supply switching devices corresponding to each bus, a switching switch controlled by each power supply switching device and a comprehensive load model; Based on the comprehensive load model and the primary structure of the industrial park power grid, accident tripping of the production load of the industrial park under different working conditions is simulated in the simulation model, transient respo