Grouping switching dynamic reactive power compensation device

Abstract

The utility model relates to a grouping switching dynamic reactive power compensation device, which comprises a reactor, a circuit breaker, a plurality of isolating switches and a plurality of power units, one end of the reactor is connected with one end of the circuit breaker, the other end of the circuit breaker is connected with one end of the first isolation switch, and the other end of the first isolation switch is connected with a power grid; each power unit passes through an isolating switch and then is connected in parallel with the other end of the reactor; according to the utility model, the occupied space can be effectively saved, the equipment cost is reduced, the power failure time and economic loss caused by faults are reduced, and the energy utilization efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to a group-switching dynamic reactive power compensation device, belonging to the field of reactive power compensation technology in power systems. Background Technology

[0002] With the large-scale integration of new energy sources into new power systems, higher demands are placed on the safe and stable operation of the power grid. Improving the safe and stable operation of the power grid by integrating new energy sources and achieving smooth, continuous, and bidirectional reactive power regulation is crucial. Currently, SVG (Static Var Compensator) devices are widely used; however, compared to traditional reactive power compensation devices such as capacitors and reactors, SVG devices suffer from higher costs and higher failure rates. Power electronic devices, as the core component of SVG, also have the highest failure rate.

[0003] The traditional wiring method for SVG involves power units composed of power electronic devices such as IGBTs passing through a set of reactors, then connected to a circuit breaker with a parallel starting resistor, and finally connected to the power grid through a surge arrester and a single grounding disconnector. This wiring method has some drawbacks, such as large footprint, high cost, and the fact that a failure of a single power unit may affect the operation of the entire device, making it unable to flexibly respond to different reactive power demands of the system. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this utility model proposes a group switching dynamic reactive power compensation device.

[0005] The technical solution of this utility model is as follows:

[0006] A group-switching dynamic reactive power compensation device includes a reactor, a circuit breaker, multiple disconnect switches, and multiple power units;

[0007] One end of the reactor is connected to one end of the circuit breaker, the other end of the circuit breaker is connected to one end of the first disconnecting switch, and the other end of the first disconnecting switch is connected to the power grid.

[0008] Each power unit is connected in parallel to the other end of the reactor after passing through an isolating switch.

[0009] In a preferred embodiment of this utility model, a surge arrester is provided between the circuit breaker and the first disconnecting switch.

[0010] In a preferred embodiment of this utility model, the circuit breaker is a parallel starting resistor circuit breaker.

[0011] In a preferred embodiment of this utility model, the disconnecting switch is a single-ground disconnecting switch.

[0012] This utility model has the following beneficial effects:

[0013] 1. This utility model effectively saves floor space and reduces equipment costs by using grid-connected devices such as shared reactors, circuit breakers with parallel starting resistors, surge arresters, and single-ground disconnect switches.

[0014] 2. When a single power unit of this invention fails, its connection to the power grid can be disconnected via an isolating switch for individual repair. Other power units continue to operate normally. This significantly improves the reliability and stability of the device and reduces power outage time and economic losses caused by faults.

[0015] 3. When the initial reactive power demand of the power grid is small, only the necessary power units need to be put into operation. Other power units are disconnected from the power grid by disconnecting the power units through the isolating switch, thereby reducing the operating losses of the power units, improving energy utilization efficiency, and realizing the economical operation of the device. Attached Figure Description

[0016] Figure 1 This is the circuit diagram of this utility model;

[0017] Figure 2 This is a layout diagram of the present utility model;

[0018] 1. Power unit; 2. Single grounding disconnect switch; 3. Reactor; 4. Parallel starting resistor circuit breaker; 5. Surge arrester; 6. Single grounding disconnect switch. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0021] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0023] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0024] Example 1:

[0025] See Figure 1 A group-switching dynamic reactive power compensation device includes a reactor L, a circuit breaker QF, multiple disconnect switches (QS, QS1, QS2…QSn) and multiple power units (GL1, GL2…GLn).

[0026] One end of the reactor L is connected to one end of the circuit breaker QF, the other end of the circuit breaker QF is connected to one end of the first disconnecting switch QS, and the other end of the first disconnecting switch QS is connected to the power grid.

[0027] The reactor L serves to limit current variations, protect power units, and improve power quality.

[0028] Each power unit (GL1, GL2...GLn) is connected in parallel to the other end of the reactor L after passing through an isolating switch (QS1, QS2...QSn).

[0029] In a preferred embodiment of this invention, a surge arrester FV is provided between the circuit breaker QF and the first disconnecting switch QS. The surge arrester FV is used to protect the device from damage caused by lightning strikes and operational overvoltages.

[0030] In a preferred embodiment of this invention, the circuit breaker QF is a circuit breaker with a parallel starting resistor R. The circuit breaker with the parallel starting resistor is used to control the start and stop of the device. The starting resistor can limit the starting current and prevent the large current during startup from burning out the IGBT device.

[0031] In a preferred embodiment of this invention, the disconnecting switches (QS, QS1, QS2...QSn) are single-ground disconnecting switches, which are used to disconnect the power unit from the power grid when the power unit fails or is not required to operate.

[0032] In a preferred embodiment of this invention, the power unit is composed of power electronic devices such as IGBTs and is the basic unit for realizing reactive power compensation.

[0033] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A group-switching dynamic reactive power compensation device, characterized in that, Includes reactors, circuit breakers, multiple disconnect switches, and multiple power units; One end of the reactor is connected to one end of the circuit breaker, the other end of the circuit breaker is connected to one end of the first disconnecting switch, and the other end of the first disconnecting switch is connected to the power grid. Each power unit is connected in parallel to the other end of the reactor after passing through an isolating switch.

2. The group-switching dynamic reactive power compensation device according to claim 1, characterized in that, A surge arrester is provided between the circuit breaker and the first disconnecting switch.

3. The group-switching dynamic reactive power compensation device according to claim 1, characterized in that, The circuit breaker is a parallel starting resistor circuit breaker.

4. The group-switching dynamic reactive power compensation device according to claim 1, characterized in that, The disconnecting switch is a single-ground disconnecting switch.

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