CN-122001023-A - Network side capacity control method of power interface device and current transformation equipment

CN122001023ACN 122001023 ACN122001023 ACN 122001023ACN-122001023-A

Abstract

The application relates to a grid-side capacity control method of a power interface device and converter equipment, wherein one side of the power interface device is connected with at least one converter, the other side of the power interface device is connected with a power grid, when two or more power interface devices exist, each power interface device is connected with the power grid after being connected in parallel, for each power interface device, grid-side current and grid-side power of the power interface device are obtained, power output reference values of each converter are adjusted based on the grid-side current, the grid-side power and a preset current threshold value, power output of the converter is adjusted based on the adjusted power output reference values, and the power output comprises active output and/or reactive output. The application takes the network side current limit value of the power interface device as a control target, adjusts the power output of each converter, and further realizes the control of the current flowing through the network side interface of the power interface device, so that the network side current is limited in a reasonable range, the condition that the capacity of the network side is over-limited or limited is avoided, and the working reliability of the converter equipment is improved.

Inventors

YU ZIWEI
SUN JIANWEN

Assignees

上海思格数字技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (11)

1. The utility model provides a power interface device net side capacity control method which characterized in that, power interface device's one side links to each other with at least one converter, power interface device's opposite side links to each other with the electric wire netting, and when there are two or more power interface device, each power interface device connects in parallel the back again with the electric wire netting, and the control method includes: And for each power interface device, acquiring network side current and network side power of the network side of the power interface device, adjusting power output reference values of all converters connected with the power interface device based on the network side current, the network side power and a preset current threshold value, and adjusting power output of the converters based on the adjusted power output reference values, wherein the power output comprises active output and/or reactive output.
2. The grid-side capacity control method of a power interface device of claim 1, wherein adjusting the power output reference value of each converter connected to the power interface device based on the grid-side current, the grid-side power, and a preset current threshold comprises determining a grid-side apparent power reference value based on the grid-side current and the current threshold, determining a total power output limit value based on the grid-side apparent power reference value and the grid-side power, and adjusting the power output reference value of each converter based on the total power output limit value.
3. The power interface device grid-side capacity control method of claim 2, wherein determining a grid-side apparent power reference value based on the grid-side current and the current threshold comprises: And taking the current threshold value as an instruction, taking the network side current as feedback and inputting the feedback to a first controller, and obtaining the network side apparent power reference value after the current threshold value is regulated by the first controller.
4. The power interface device grid-side capacity control method of claim 2, wherein determining a total power output limit based on the grid-side apparent power reference value and the grid-side power comprises: when the network side power is active power and the total power output limit value is the total active output upper limit value: the network side apparent power reference value is used as an instruction, the active power is used as feedback and input into a second controller, and the total active output upper limit value is obtained after the adjustment of the second controller; when the network side power is active power and the total power output limit value is a total active output lower limit value: And taking the opposite value of the network side apparent power reference value as an instruction, taking the active power as feedback and inputting the feedback into a third controller, and obtaining the lower limit value of the total active output after the adjustment by the third controller.
5. The power interface device grid-side capacity control method of claim 2, wherein determining a total power output limit based on the grid-side apparent power reference value and the grid-side power comprises: When the network side power is reactive power and the total power output limit value is the total reactive power output upper limit value: the network side apparent power reference value is used as an instruction, the reactive power is used as feedback and input into a fourth controller, and the total reactive power output upper limit value is obtained after the reactive power is regulated by the fourth controller; when the network side power is reactive power and the total power output limit value is a total reactive power output lower limit value: and taking the opposite value of the network side apparent power reference value as an instruction, taking the reactive power as feedback and inputting the reactive power into a fifth controller, and obtaining the lower limit value of the total reactive power output after the reactive power is regulated by the fifth controller.
6. The power interface device grid-side capacity control method of claim 4, wherein adjusting the power output reference value of each converter based on the total power output limit value comprises: when the power output reference value is an active power output reference value: and taking the lower limit value of the total active output as a lower limit and the upper limit value of the total active output as an upper limit, carrying out amplitude limiting treatment on the total active output reference value to obtain an amplitude limited total active output reference value, and adjusting the active output reference value of each converter based on the amplitude limited total active output reference value.
7. The power interface device grid-side capacity control method of claim 5, wherein adjusting the power output reference value of each converter based on the total power output limit value comprises: when the power output reference value is a reactive output reference value: and taking the lower limit value of the total reactive power output as a lower limit and the upper limit value of the total reactive power output as an upper limit, performing amplitude limiting treatment on the total reactive power output reference value to obtain an amplitude-limited total reactive power output reference value, and adjusting the reactive power output reference value of each converter based on the amplitude-limited total reactive power output reference value.
8. The method of claim 6, wherein adjusting the power output of the converter based on the adjusted power output reference value comprises: and adjusting the active output of the converter by taking the adjusted active output reference value as an instruction.
9. The method of claim 7, wherein adjusting the power output of the converter based on the adjusted power output reference value comprises: And adjusting the reactive power output of the converter by taking the adjusted reactive power output reference value as a command.
10. The utility model provides a current transformation equipment, its characterized in that, current transformation equipment includes at least one converter and at least one electric power interface device, and one side of each electric power interface device links to each other with at least one converter, and the opposite side of each electric power interface device links to each other with the electric wire netting, and when there are two or more electric power interface devices, each electric power interface device links to each other with the electric wire netting after parallelly connected, current transformation equipment still includes data acquisition ware and treater, wherein: The data acquisition device is used for acquiring network side current and network side power of the network side of each power interface device; The processor executing the power interface device grid-side capacity control method according to any one of claims 1 to 9, adjusting power output reference values of each converter connected to the power interface device based on the grid-side current, the grid-side power, and a preset current threshold; And each converter adjusts the power output of the converter based on the adjusted power output reference value, wherein the power output comprises active output and/or reactive output.
11. The converter apparatus of claim 10 wherein the power interface device is embedded in the converter or the power interface device is independently external to the converter.

Description

Network side capacity control method of power interface device and current transformation equipment Technical Field The invention relates to the technical field of variable current control, in particular to a grid-side capacity control method of an electric power interface device and variable current equipment. Background The converter is used as a core device in a new energy system, such as an optical storage system and an optical storage and charging system, and plays key roles of direct current-alternating current bidirectional electric energy conversion, power regulation, system protection and the like. The ac side of the converter is typically connected to a load, a power grid, etc. via a power interface device, which may generally comprise a load interface and a grid interface for connection to the power grid. Because of the limitation and influence of the cable and the switch (such as a relay, etc.) arranged on the cable, the current flowing through the load interface and the network interface needs to be limited in a reasonable range so as to ensure the safe and effective operation of the equipment. The current flowing through the load interface can be controlled by limiting the load specification, and the current flowing through the network side interface is regulated by taking the power limiting value as a control target, but due to the uncertainty of the voltage, the line current is still too large or too small, and the network side capacity corresponding to the network side interface of the power interface device is limited or exceeds the capacity. Disclosure of Invention The present invention is directed to a method for controlling the grid-side capacity of a power interface device and a converter device, which take a grid-side current limit value of the power interface device as a control target, and adjust the power output of a converter connected to the power interface device, so as to achieve optimal control of the current flowing through the grid-side interface of the power interface device, i.e. the grid-side current limit. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a power interface device network side capacity control method, wherein one side of a power interface device is connected with at least one converter, the other side of the power interface device is connected with a power grid, and when two or more power interface devices exist, each power interface device is connected in parallel and then connected with the power grid, the control method comprises the following steps: and for each power interface device, acquiring network side current and network side power of a network side of the power interface device, adjusting power output reference values of all converters connected with the power interface device based on the network side current, the network side power and a preset current threshold value, and adjusting power output of the converters based on the adjusted power output reference values, wherein the power output comprises active output and/or reactive output. According to one embodiment of the invention, the power output reference value of each converter connected with the power interface device is adjusted based on network side current, network side power and a preset current threshold value, and the method comprises the steps of determining a network side apparent power reference value based on the network side current and the current threshold value, determining a total power output limit value based on the network side apparent power reference value and the network side power, and adjusting the power output reference value of each converter based on the total power output limit value. According to one embodiment of the invention, determining a grid-side apparent power reference value based on a grid-side current and a current threshold comprises: And the current threshold is used as an instruction, the current at the network side is used as feedback and input into the first controller, and the network side apparent power reference value is obtained after the current is regulated by the first controller. According to one embodiment of the present invention, determining the total power output limit based on the grid-side apparent power reference and the grid-side power includes: When the network side power is active power and the total power output limit value is the upper limit value of the total active power output: the network side apparent power reference value is used as an instruction, active power is used as feedback and input into a second controller, and the total active output upper limit value is obtained after the adjustment of the second controller; When the network side power is active power and the total power output limit value is the total active output lower limit value: And taking the opposite value of the network side apparent power reference value as an instruction, taking acti