KR-20260067362-A - CELL CAPACITANCE EQUALIZATION TREATMENT METHOD

Abstract

An SVC capacitor capacitance equalization device according to one embodiment of the present invention includes a sensor; and a processor that measures the capacitance of each cell constituting each phase of the capacitor of an SVC (Static Var Compensator) installed in a substation through the sensor and processes the equalization of the measured capacitance of each cell.

Inventors

• 이석창
• 정회종
• 홍성혁

Assignees

• 한국전력공사

Dates

Publication Date

20260512

Application Date

20260422

Claims (1)

1. A step in which a processor measures the capacitance of each cell constituting each phase of the capacitor of an SVC installed in a substation through a sensor; and A step in which the processor equalizes the capacitance of each measured cell; Includes, The above equalization treatment step is, The method includes the step of performing the equalization process by mutually swapping the capacitance values of two different cells among a plurality of cells included in the capacitor; In the above equalization treatment step, The above processor is, Calculate the average capacitance of all cells based on the capacitance of each cell measured above, calculate the deviation between the average capacitance and the capacitance of each cell, and equalize the capacitance of each cell based on the deviation of each cell. A positive deviation and a negative deviation are calculated as deviations of each of the above cells, a rank is assigned to each of the above cells based on the positive deviation and the negative deviation, and the capacitance values of each of the above cells are swapped with each other according to the rank of each of the above cells to equalize the capacitance of each of the above cells. Assigning a rank to each of the above cells is, The processor assigns ranks to each of the first cells having a positive deviation and the second cells having a negative deviation, starting from the largest value based on the absolute value of the deviation. In the above equalization treatment step, The above processor is, The capacitance of each cell is equalized by swapping the capacitance values of the cells assigned the same rank among the first cells and the second cells, and A cell capacitance equalization method characterized by equalizing the capacitance of the left side and the right side of the capacitor by swapping the capacitance value of the corresponding cell included in the left side and the capacitance value of the corresponding cell included in the right side, according to the ranking of the cells included in the left side and the right side of the capacitor, respectively.

Description

Cell Capacitance Equalization Treatment Method Embodiments of the present invention relate to an SVC capacitor capacitance equalization apparatus and method. For example, when transmitting power from a distribution panel, both DC and AC transmission systems require compensation for reactive power. Reactive power is power that does not actually perform any work or consume heat. Since reactive power merely travels back and forth between the power source and electrical equipment and does not generate energy, it cannot be utilized in practice. If reactive power consumption increases, the voltage may drop excessively during transmission, potentially leading to power outages or interruptions. Therefore, it is necessary to appropriately compensate for reactive power to prevent such situations from occurring. To this end, transmission systems use reactive power compensation devices. Reactive power compensation devices can be divided into Static Var Compensators (SVCs), which compensate for reactive power using thyristor components, and Static Synchronous Compensators (STATCOMs), which use Insulated Gate Bipolar Mode Transistors (IGBTs). A typical SVC system may include a Thyristor Switched Capacitor (TSC) that supplies reactive power and a Thyristor Controlled Reactor (TCR) that absorbs reactive power. The SVC system supplies or absorbs reactive power to the power grid by adjusting the reactive power levels of the TSC and TCR; through these functions, it plays a role in enhancing the stability of the power grid by performing grid adjustments through voltage, power factor, and reactive power control. The technology forming the background of the present invention is disclosed in Korean Registered Patent Publication No. 10-2624272 (January 9, 2024). Figure 1 is a diagram showing an SVC composed of a thyristor, a reactor, a capacitor, etc. Figure 2 is a diagram showing the capacitor of the SVC installed at the 345kV Sinpaju Substation. Figure 3 is a detailed drawing of the A-phase Cell of Figure 2. Figure 4 is a diagram showing an equivalent circuit with a simplified SVC A-phase capacitor and cell structure. FIG. 5 is a block diagram illustrating an SVC capacitor capacitance equalization device according to one embodiment of the present invention. Figure 6 is a diagram showing an example of swapping cell values. FIG. 7 is a flowchart illustrating a method for equalizing SVC capacitor capacitance according to one embodiment of the present invention. The advantages and/or features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. In addition, the preferred embodiments of the present invention described below focus on explaining the functional configurations that must be additionally provided for the present invention, while omitting as much as possible the system functional configurations that are already provided in each system functional configuration or are ordinarily provided in the technical field to which the present invention belongs, in order to efficiently explain the technical components constituting the present invention. If a person skilled in the art to which the present invention belongs is able to easily understand the functions of the components that are conventionally used among the functional configurations that are omitted and not illustrated below, and can also clearly understand the relationship between the components omitted as above and the components added for the present invention. Furthermore, in the following description, terms such as "transmission," "communication," "transmission," "reception," and other terms of similar meaning regarding signals or information include not only the direct transfer of signals or information from one component to another but also the transfer through other components. In particular, "transmitting" or "transmitting" a signal or information to a component refers to the final destination of the signal or information and does not imply a direct destination. The same applies to the "reception" of signals or information. A Static Var Compensator (SVC) is a static reactive power compensation device utilizing thyristors, which are power semiconductor devices, and is installed for the purpose of stabilizing grid voltage through reactive power adjustment. In other words, the SVC significantly contributes to improving grid stability, reducing transmission losses, and increasing transmi