CN112290559A - Mixed type reactive power compensation device - Google Patents
Mixed type reactive power compensation device Download PDFInfo
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- CN112290559A CN112290559A CN202011268937.9A CN202011268937A CN112290559A CN 112290559 A CN112290559 A CN 112290559A CN 202011268937 A CN202011268937 A CN 202011268937A CN 112290559 A CN112290559 A CN 112290559A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a hybrid reactive power compensation device, comprising: the system comprises a first current transformer, a voltage transformer, a plurality of TSC switching units, a static var generator, a circuit breaker and a main controller; the method comprises the steps that a main controller distributes reactive power according to power grid voltage detected by a voltage transformer, power grid current detected by a first current transformer, output current transmitted by a static reactive power generator and direct-current side voltage to obtain first distributed power and second distributed power, controls a plurality of TSC switching units to perform reactive power compensation according to the first distributed power, and controls the static reactive power generator to perform reactive power compensation according to the second distributed power; and the circuit breaker is respectively connected with the power grid and the static var generator and is used for controlling the working state of the static var generator. The invention realizes the large-capacity reactive compensation of the power grid and the accurate reactive compensation, thereby realizing the effect of purifying the power grid.
Description
Technical Field
The invention relates to the technical field of reactive power compensation of power systems, in particular to a hybrid reactive power compensation device.
Background
With the continuous progress of power electronic technology, more and more nonlinear, impact, capacitive and inductive loads are applied to a power distribution system, reactive loads can cause the reduction of system power factors, the imbalance of voltage, the drop of voltage and the increase of line loss to influence the quality of electric energy, and can cause the breakdown of a power system and cause heavy loss in severe cases; on the other hand, reactive power is also energy necessary for maintaining electromagnetic fields of various inductive devices in a power system and performing electric energy conversion and transmission. Therefore, in actual operation, local compensation of reactive power is often required.
In the development process of the reactive power technology, several different reactive power compensation devices appear in sequence: static Var Compensator-SVC and Static Var Generator-SVG. Wherein the static reactive power compensation device can compensate large capacity but can not compensate accurately; the static var generator can realize accurate reactive compensation, but the compensation capacity of the current power electronic device is limited due to the higher cost. However, a Thyristor switched Capacitor (Thyristor switched Capacitor-TSC) in the prior art has a large capacity but cannot accurately compensate for the stepped compensation state, and a static var generator can accurately compensate for the stepped compensation state but has a small capacity.
Disclosure of Invention
The invention aims to provide a hybrid reactive power compensation device to achieve the effect of high-capacity and high-precision reactive power compensation on a power grid.
To achieve the above object, the present invention provides a hybrid type reactive power compensation device including:
the first current transformer is connected with a power grid and used for detecting the current of the power grid;
the voltage transformer is connected with the power grid and used for detecting the voltage of the power grid;
the TSC switching units are connected with the power grid in parallel and used for performing reactive compensation on the power grid;
the static var generator is connected with the power grid and is used for performing reactive compensation on the power grid;
the circuit breaker is respectively connected with the power grid and the static var generator and is used for controlling the working state of the static var generator;
and the main controller is respectively connected with the TSC switching units, the static var generator, the first current transformer and the voltage transformer, and is used for distributing reactive power according to the power grid voltage, the power grid current, the output current and the direct-current side voltage to obtain first distributed power and second distributed power, controlling the TSC switching units to perform reactive power compensation according to the first distributed power, and controlling the static var generator to perform reactive power compensation according to the second distributed power.
Optionally, the master controller comprises:
the sampling conditioning circuit is respectively connected with the first current transformer, the voltage transformer and the static var generator, and is used for acquiring power grid voltage, power grid current, the output current and the direct-current side voltage, filtering and transmitting the power grid voltage, the power grid current, the output current and the direct-current side voltage to the main control circuit;
the main control circuit is connected with the sampling conditioning circuit and used for distributing reactive power according to the filtered power grid voltage, the filtered power grid current, the filtered output current and the filtered direct-current side voltage to obtain first distributed power and second distributed power;
the driving circuit is connected with the main control circuit and used for sending a pulse signal to drive the static var generator according to the second distributed power;
and the switching control circuit is respectively connected with the main control circuit and the plurality of TSC switching units and is used for controlling the working states of the plurality of TSC switching units according to the first distribution power.
Optionally, the static var generator comprises:
the inverter circuit is connected with the driving circuit and used for performing reactive compensation according to the pulse signal and outputting output current to be processed and the direct-current side voltage;
the direct-current voltage sensor is arranged corresponding to the inverter circuit, connected with the sampling conditioning circuit and used for transmitting the collected direct-current side voltage to the sampling conditioning circuit;
the filter circuit is connected with the inverter circuit and is used for inhibiting the peak of the output current to be processed and higher harmonics larger than 4.7KHZ and outputting the output current;
the second current transformer is respectively connected with the filter circuit and the sampling conditioning circuit and is used for detecting the output current and sending the output current to the sampling conditioning circuit;
the main relay is respectively connected with the second current transformer and the circuit breaker and is used for controlling the working states of the second current transformer, the filter circuit and the inverter circuit;
and the soft start capacitor is respectively connected with the second current transformer and the circuit breaker and used for storing electric energy.
Optionally, the inverter circuit includes:
the three-level full-bridge inverter is respectively connected with the driving circuit and the filter circuit and is used for performing reactive compensation according to the pulse signal and outputting output current to be processed and original direct-current side voltage;
and the direct current support capacitor is arranged corresponding to the direct current voltage sensor, is connected with the three-level full-bridge inverter, and is used for storing and supporting the original direct current side voltage and outputting the direct current side voltage.
Optionally, the main controller further comprises:
and the centralized control display screen is connected with the main control circuit and is used for displaying the first distributed power, the second distributed power and the working state of the main control circuit.
Optionally, the centralized control display screen is connected with the main control circuit through an RS485 bus.
Optionally, the dc voltage sensor is a hall dc voltage sensor.
Optionally, the main control circuit is composed of a floating-point DSP chip of TMS320F28335 and a chip of EP1C6T144I 7; the type of the centralized control display screen is a Kunlun normal screen with TPC1570 Gi; the switching control circuit is a level conversion isolation circuit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a hybrid reactive power compensation device, comprising: the system comprises a first current transformer, a voltage transformer, a plurality of TSC switching units, a static var generator, a circuit breaker and a main controller; the method comprises the steps that a main controller distributes reactive power according to power grid voltage detected by a voltage transformer, power grid current detected by a first current transformer, output current transmitted by a static reactive power generator and direct-current side voltage to obtain first distributed power and second distributed power, controls a plurality of TSC switching units to perform reactive power compensation according to the first distributed power, and controls the static reactive power generator to perform reactive power compensation according to the second distributed power; and the circuit breaker is respectively connected with the power grid and the static var generator and is used for controlling the working state of the static var generator. The invention realizes the large-capacity reactive compensation of the power grid and the accurate reactive compensation, thereby realizing the effect of purifying the power grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a circuit diagram of a hybrid reactive power compensation device according to an embodiment of the present invention;
FIG. 2 is a detailed circuit diagram of an inverter circuit and a filter circuit according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a static var generator and a TSC switching unit and a power grid according to an embodiment of the present invention;
the system comprises a static var generator (1), a TSC switching unit (2), a master controller (3), a master controller (4), an inverter circuit (5), a filter circuit (6), a main relay (7), a circuit breaker (8), a soft start capacitor (9), a first current transformer (10), a voltage transformer (11), a second current transformer (12), a direct current voltage sensor (DC) and a driving circuit (304), wherein the master controller (301), the master controller (302), a sampling conditioning circuit (303), the driving circuit (304), a switching control circuit (305), a centralized control display screen (401), a three-level full-bridge inverter (402) and a DC support capacitor (DC).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a hybrid reactive power compensation device to achieve the effect of high-capacity and high-precision reactive power compensation on a power grid.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a circuit diagram of a hybrid reactive power compensation device according to an embodiment of the present invention, and as shown in fig. 1, the hybrid reactive power compensation device includes: the system comprises a first current transformer 9, a voltage transformer 10, a plurality of TSC switching units 2, a static var generator 1, a circuit breaker 7 and a main controller 3. The first current transformer 9 is connected with a power grid, the voltage transformer 10 is connected with the power grid, the TSC switching units 2 are connected with the power grid in parallel, the static var generator 1 is connected with the power grid, the circuit breaker 7 is respectively connected with the power grid and the static var generator 1, and the main controller 3 is respectively connected with the TSC switching units 2, the static var generator 1, the first current transformer 9 and the voltage transformer 10; the first current transformer 9 is used for detecting the current of the power grid; the voltage transformer 10 is used for detecting the voltage of a power grid; the TSC switching units 2 are used for performing reactive compensation on a power grid; the static var generator 1 is used for performing reactive compensation on a power grid; the circuit breaker 7 is used for controlling the working state of the static var generator 1; the main controller 3 is used for distributing reactive power according to the power grid voltage, the power grid current, the output current and the direct-current side voltage to obtain first distributed power and second distributed power, controlling the TSC switching units 2 to perform reactive coarse compensation according to the first distributed power, and controlling the static reactive generator 1 to perform reactive accurate compensation according to the second distributed power. And the TSC switching unit 2 is flexibly configured according to the actual load condition.
In this embodiment, the main controller 3 includes: a sampling conditioning circuit 302, a main control circuit 301, a drive circuit 303 and a switching control circuit 304. The sampling conditioning circuit 302 is respectively connected with the first current transformer 9, the voltage transformer 10 and the static var generator 1, the main control circuit 301 is connected with the sampling conditioning circuit 302, the driving circuit 303 is connected with the main control circuit 301, and the switching control circuit 304 is respectively connected with the main control circuit 301 and the plurality of TSC switching units 2; the sampling conditioning circuit 302 is configured to obtain a power grid voltage, a power grid current, the output current, and the dc side voltage in real time, perform filtering processing, and transmit the filtered output current and the filtered output current to the main control circuit 301; the main control circuit 301 is configured to distribute reactive power according to the filtered power grid voltage, the filtered power grid current, the filtered output current, and the filtered dc side voltage, so as to obtain a first distributed power and a second distributed power; the driving circuit 303 is configured to send out a pulse signal according to the second divided power to drive the static var generator 1; the driving circuit 303 is further configured to receive a fault feedback signal of the inverter circuit 4 and send the fault feedback signal to the main control circuit 301, and after receiving the fault feedback signal, the main control circuit 301 controls the driving circuit 303 to further play a role in protecting the inverter circuit 4; the switching control circuit 304 is configured to control the operating states of the plurality of TSC switching units 2 according to the first distribution power.
Fig. 2 is a specific circuit diagram of an inverter circuit and a filter circuit according to an embodiment of the present invention, and as shown in fig. 2, in this embodiment, the static var generator 1 includes: the system comprises an inverter circuit 4, a direct-current voltage sensor 12, a filter circuit 5, a second current transformer 11, a main relay 6 and a soft start capacitor 8. Inverter circuit 4 with drive circuit 303 connects, direct current voltage sensor 12 with inverter circuit 4 corresponds the setting, with sampling conditioning circuit 302 connects, filter circuit 5 with inverter circuit 4 connects, second current transformer 11 respectively with filter circuit 5 with sampling conditioning circuit 302 connects, main relay 6 respectively with second current transformer 11 with circuit breaker 7 connects, soft-start electric capacity 8 respectively with second current transformer 11 with circuit breaker 7 connects. The inverter circuit 4 is used for performing reactive power accurate compensation according to the pulse signal and outputting output current to be processed and the direct-current side voltage; the dc voltage sensor 12 is configured to transmit the collected dc side voltage to the sampling and conditioning circuit 302; the filter circuit 5 is used for suppressing a peak of the output current to be processed and higher harmonics larger than 4.7KHZ and outputting the output current, and the filter circuit 5 can effectively prevent external interference and improve the anti-interference capability; the second current transformer 11 is configured to detect the output current and send the output current to the sampling and conditioning circuit 302; the main relay 6 is used for controlling the working states of the second current transformer 11, the filter circuit 5 and the inverter circuit 4; the soft start capacitor 8 is used for storing electric energy.
In the present embodiment, the inverter circuit 4 includes: a three-level full bridge inverter 401 and a dc support capacitor 402. The three-level full-bridge inverter 401 is respectively connected with the driving circuit 303 and the filter circuit 5, and is configured to perform accurate reactive power compensation according to the pulse signal, and output an output current to be processed and an original dc-side voltage; the dc support capacitor 402 is disposed corresponding to the dc voltage sensor 12, connected to the three-level full-bridge inverter 401, and configured to store and support the original dc-side voltage, and output the dc-side voltage. The three-level full-bridge inverter 401 controls the voltage at the direct current side in the direct current support capacitor 402 to pass through the filter circuit 5 to the power grid, and the function of reactive power accurate compensation is achieved.
In this embodiment, the main controller 3 further includes:
and a centralized control display screen 305 connected to the main control circuit 301, and configured to display the first distributed power, the second distributed power, and a working state of the main control circuit 301. The centralized control display screen 305 is also used for displaying the grid current, the grid voltage, the output current and the dc side voltage.
In this embodiment, the centralized control display screen 305 is connected to the main control circuit 301 through an RS485 bus. The direct current voltage sensor 12 is a hall direct current voltage sensor 12.
In this embodiment, the main control circuit 301 is composed of a floating-point DSP chip of TMS320F28335 and a chip of EP1C6T144I 7; the three-level full-bridge inverter 401 is specifically a three-phase NPC three-level full-bridge inverter; the centralized control display screen 305 is a kunlun communication screen with a model of TPC1570Gi, specifically a kunlun communication screen with a model of TPC1570Gi (Gx); the switching control circuit 304 is a level conversion isolation circuit composed of a 6N137 optical coupler and a peripheral circuit; the driving circuit 303 consists of an ACPL316J chip and peripheral circuits; the sampling conditioning circuit 302 is composed of an AD7606 chip and peripheral circuits.
Fig. 3 is a schematic diagram of connection between a static var generator and a TSC switching unit and a power grid according to an embodiment of the present invention, and as shown in fig. 3, the present invention solves the problem that the TSC switching unit 2 has a large reactive compensation capacity but a low accuracy, and the static var generator 1 cannot satisfy the large-capacity reactive compensation. According to the invention, after the coarse compensation of the TSC switching unit 2, the aim of completely eliminating the reactive power and harmonic waves of the power grid is achieved by the combination of the two compensation modes through the precise compensation of the static var generator 1. The invention realizes the reactive compensation effect with large capacity, high precision and good real-time property.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A hybrid reactive compensation device, comprising:
the first current transformer is connected with a power grid and used for detecting the current of the power grid;
the voltage transformer is connected with the power grid and used for detecting the voltage of the power grid;
the TSC switching units are connected with the power grid in parallel and used for performing reactive compensation on the power grid;
the static var generator is connected with the power grid and is used for performing reactive compensation on the power grid;
the circuit breaker is respectively connected with the power grid and the static var generator and is used for controlling the working state of the static var generator;
and the main controller is respectively connected with the TSC switching units, the static var generator, the first current transformer and the voltage transformer, and is used for distributing reactive power according to the power grid voltage, the power grid current, the output current and the direct-current side voltage to obtain first distributed power and second distributed power, controlling the TSC switching units to perform reactive power compensation according to the first distributed power, and controlling the static var generator to perform reactive power compensation according to the second distributed power.
2. The hybrid reactive compensation device of claim 1, wherein the master controller comprises:
the sampling conditioning circuit is respectively connected with the first current transformer, the voltage transformer and the static var generator, and is used for acquiring the power grid voltage, the power grid current, the output current and the direct-current side voltage, filtering and transmitting the power grid voltage, the power grid current, the output current and the direct-current side voltage to the main control circuit;
the main control circuit is connected with the sampling conditioning circuit and used for distributing reactive power according to the filtered power grid voltage, the filtered power grid current, the filtered output current and the filtered direct-current side voltage to obtain first distributed power and second distributed power;
the driving circuit is connected with the main control circuit and used for sending a pulse signal to drive the static var generator according to the second distributed power;
and the switching control circuit is respectively connected with the main control circuit and the plurality of TSC switching units and is used for controlling the working states of the plurality of TSC switching units according to the first distribution power.
3. The hybrid reactive compensation device of claim 2, wherein the static var generator comprises:
the inverter circuit is connected with the driving circuit and used for performing reactive compensation according to the pulse signal and outputting output current to be processed and the direct-current side voltage;
the direct-current voltage sensor is arranged corresponding to the inverter circuit, connected with the sampling conditioning circuit and used for transmitting the collected direct-current side voltage to the sampling conditioning circuit;
the filter circuit is connected with the inverter circuit and is used for inhibiting the peak of the output current to be processed and higher harmonics larger than 4.7KHZ and outputting the output current;
the second current transformer is respectively connected with the filter circuit and the sampling conditioning circuit and is used for detecting the output current and sending the output current to the sampling conditioning circuit;
the main relay is respectively connected with the second current transformer and the circuit breaker and is used for controlling the working states of the second current transformer, the filter circuit and the inverter circuit;
and the soft start capacitor is respectively connected with the second current transformer and the circuit breaker and used for storing electric energy.
4. The hybrid reactive compensation device of claim 3, wherein the inverter circuit comprises:
the three-level full-bridge inverter is respectively connected with the driving circuit and the filter circuit and is used for performing reactive compensation according to the pulse signal and outputting output current to be processed and original direct-current side voltage;
and the direct current support capacitor is arranged corresponding to the direct current voltage sensor, is connected with the three-level full-bridge inverter, and is used for storing and supporting the original direct current side voltage and outputting the direct current side voltage.
5. The hybrid reactive compensation device of claim 2, wherein the master controller further comprises:
and the centralized control display screen is connected with the main control circuit and is used for displaying the first distributed power, the second distributed power and the working state of the main control circuit.
6. The hybrid reactive power compensation device of claim 5, wherein the centralized control display screen is connected to the main control circuit through an RS485 bus.
7. The hybrid reactive power compensation device of claim 3, wherein the DC voltage sensor is a Hall type DC voltage sensor.
8. The hybrid reactive power compensation device of claim 4, wherein the master control circuit is composed of a floating-point DSP chip of TMS320F28335 and a chip of model EP1C6T144I 7; the type of the centralized control display screen is a Kunlun normal screen with TPC1570 Gi; the switching control circuit is a level conversion isolation circuit.
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| CN202011268937.9A CN112290559A (en) | 2020-11-13 | 2020-11-13 | Mixed type reactive power compensation device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN211151548U (en) * | 2019-12-20 | 2020-07-31 | 江苏沃之源电力技术有限公司 | Mixed type reactive power compensation device |
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- 2020-11-13 CN CN202011268937.9A patent/CN112290559A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN211151548U (en) * | 2019-12-20 | 2020-07-31 | 江苏沃之源电力技术有限公司 | Mixed type reactive power compensation device |
Non-Patent Citations (1)
| Title |
|---|
| 董浩等: "电网混合型无功补偿系统", 《电气时代》 * |
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