CN207098621U - A kind of central controlled power distribution station mixing compensation system and active compensation module - Google Patents

Abstract

The utility model provides a hybrid compensation system and an active compensation module of a centrally controlled distribution station area. The hybrid compensation system includes an active compensation device and a reactive power compensation device for connecting a three-phase AC bus to provide reactive compensation for the three-phase AC bus Source compensation device; the active compensation device includes at least two active compensation modules, one of which is a centralized controller; the active module as the centralized controller communicates with other active compensation modules, and controls the connection without source compensation device. The technical solution provided by the utility model adopts one of the active compensation modules in the active compensation device as a centralized controller to simultaneously control the active compensation device and the passive compensation device, which is not only convenient for centralized control, but also does not need to be separately set Centralized controller saves cost.

Description

A hybrid compensation system and active compensation module of centralized control distribution station

technical field

The utility model belongs to the technical field of reactive power compensation in electric power systems, and in particular relates to a hybrid compensation system and an active compensation module of a centrally controlled distribution station area.

Background technique

With the continuous improvement of living standards, the number and types of industrial and residential electrical equipment continue to increase, which has caused low power factor, low voltage, overvoltage, high harmonic content, three-phase Problems such as unbalance seriously affect the quality of industrial and residential electricity consumption.

The way to solve the above problems is to carry out reactive power compensation to the power system in the distribution station area. At present, reactive power compensation devices mainly used in distribution stations include active compensation devices and capacitor bank compensation devices, among which active compensation devices are used to provide active reactive power compensation (also called dynamic compensation devices) for power systems, including Static synchronous reactive power compensator and active power filter; capacitor bank compensation device is used to provide passive reactive power compensation (also called static compensation device) for power system, including interphase compensation capacitor bank and phase split compensation capacitor bank, interphase Capacitor bank refers to the capacitor bank composed of capacitors between any two phases, which is used to provide interphase compensation for the power system; phase split compensation capacitor bank refers to the capacitor bank composed of capacitors set between each phase and the neutral line, used It is used to provide sub-compensation for three-phase alternating current, that is, each phase is compensated separately.

The advantages and disadvantages of active compensation devices and capacitor bank compensation devices are:

(1) The capacitor bank compensation device is cheap, simple in structure, and extremely small in loss, but its shortcomings are obvious, mainly reflected in the long switching cycle, which is prone to long-term under-compensation and over-compensation; the ability to control three-phase unbalance is limited, Especially when the unbalance degree is > 35%, the treatment effect is not obvious, and problems such as harmonic current and overvoltage cannot be treated at the same time;

(2) The active compensation device has obvious advantages, mainly including fast response speed, high compensation accuracy, and can simultaneously control various power quality problems such as reactive power, low voltage, overvoltage, harmonic current, and three-phase imbalance. The operation requirements of the machine are relatively high (large heat dissipation, moisture-proof, dust-proof lamp), high noise, high cost, especially the large running loss of the whole machine, which is usually 2% to 3% of the capacity of the whole machine, which is not conducive to the distribution station area Cost-effective operation.

The patent document with the authorized announcement number CN205565735U discloses a reactive power compensation device for distribution transformers. The active compensation device and the capacitor bank compensation device are connected to the AC bus at the same time, which can perform both active reactive power compensation and passive reactive power compensation. power compensation.

However, in the content disclosed in the above-mentioned patent, the active compensation device and the capacitor bank compensation device are separately provided with corresponding controllers, which is not only costly, but also inconvenient for centralized control; and the content disclosed in the patent, in the three-phase There is only one active compensation module in the AC bus, which can provide limited reactive power compensation, and the adjustability and applicability are relatively poor.

Utility model content

The purpose of this utility model is to provide a centralized control hybrid compensation system and active compensation module for power distribution stations, which are used to solve the above-mentioned problem that centralized control cannot be performed when the power system is compensated for power quality problems.

In order to achieve the above object, the technical solution provided by the utility model is:

A centralized control hybrid compensation system for distribution stations, including an active compensation device and a passive compensation device for connecting a three-phase AC bus to provide reactive power compensation for the three-phase AC bus; the active compensation device includes at least Two active compensation modules, one of which is a centralized controller; the active module serving as the centralized controller communicates with other active compensation modules and controls the connection with passive compensation devices.

Further, the active compensation module includes a static synchronous var compensator and/or an active power filter.

Further, the passive compensation device includes an interphase capacitor bank and/or a phase split capacitor bank.

Further, it also includes a current transformer used for detection and connection to the three-phase AC busbar; the active module as a centralized controller collects and connects the current transformer.

Further, it also includes a heater for connecting the three-phase AC bus, and the heater is used for heating the hybrid compensation system.

Further, the active compensation module as a centralized controller also controls the cooling fan connected to it.

Further, it also includes a surge protector for connecting to the three-phase AC bus, and the surge protector is used to prevent surge current in the three-phase AC bus.

An active compensation module, including a controller, the controller is connected with internal power electronic devices, and the internal power electronic devices are used to provide active and reactive power compensation; the controller is provided with a communication interface between source modules and a capacitor control interface , the communication interface between active modules is used to communicate with other active compensation modules, and the capacitor control interface is used to control and connect passive compensation equipment.

Further, the controller is also provided with a fan intelligent control interface, which is used to control and connect the cooling fan.

Further, the controller is also provided with a system voltage collection interface, a system current collection interface and a device current collection interface, wherein the system voltage collection interface is used to collect the system voltage connected to the station area, and the system current collection interface is used to collect the connection station area. The system current of the device, the device current acquisition interface is used to collect the current connected to the hybrid compensation device.

The beneficial effects of the utility model are: the utility model provides a centralized control hybrid compensation system for distribution stations, which adopts one of the active compensation modules in the active compensation device as the centralized controller, and simultaneously controls the active compensation device And passive compensation device, not only facilitates centralized control, but also does not need to set up a separate centralized controller, saving costs.

Description of drawings

Fig. 1 is the structural schematic diagram of the hybrid compensation device of the centralized control distribution station area in the embodiment;

Fig. 2 is a schematic diagram of the centralized controller in the embodiment.

Detailed ways

The purpose of this utility model is to provide a centralized control hybrid compensation system and active compensation module for power distribution stations, which are used to solve the above-mentioned problem that centralized control cannot be performed when the power system is compensated for power quality problems.

In order to achieve the above object, the technical solution provided by the utility model is:

A centralized control hybrid compensation system for distribution stations, including an active compensation device and a passive compensation device for connecting a three-phase AC bus to provide reactive power compensation for the three-phase AC bus; the active compensation device includes at least Two active compensation modules, one of which is a centralized controller; the active module serving as the centralized controller communicates with other active compensation modules and controls the connection with passive compensation devices.

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

System embodiment:

This embodiment provides a centrally controlled hybrid compensation system for distribution stations. Its structural schematic diagram is shown in Figure 1. The device is equipped with three-phase AC buses, and each phase of the AC bus passes through the incoming circuit breaker and the distribution station respectively. The three-phase power supply in the area is connected, and the rated current of the circuit breaker is selected according to the rated current of the device. In this embodiment, a margin of 1.3 times is used.

On the three-phase AC bus, the lower port of the incoming circuit breaker is connected with a surge protector and a heater.

The surge protector is located at the lower port of the incoming line circuit breaker and is connected to the three-phase A, B, C and the neutral line N, and the other end is connected to the shell and the ground wire PE. It mainly plays the role of lightning protection and protects the internal equipment of the hybrid compensation device. Its voltage is selected according to the rated voltage of the device.

In this embodiment, the heater is a heater whose starting temperature can be set, and is composed of a heating part and a temperature control part. Set the set value in the temperature control part. When the temperature in the mixing compensation room is lower than the set value, the temperature control part will start the heater to maintain the indoor temperature of the device and prevent the electronic A problem with the device not functioning properly.

An active compensation device and a passive compensation device are connected to the three-phase AC bus.

The passive compensation device includes m interphase compensation capacitor banks and k phase split compensation capacitor banks, where m and k are both greater than 1.

The interphase compensation capacitor is a capacitor connected between two phases of the three-phase AC bus. Through switching control, the active power and reactive power of the two-phase AC bus can be transferred to achieve the effect of compensating reactive power and balancing the three-phase current. . In order to facilitate installation and maintenance, each three-phase interphase compensation capacitor, that is, each AB, BC, and CA three-phase interphase compensation capacitor is divided into an interphase compensation capacitor bank. Each capacitor in the interphase compensation capacitor bank can independently control switching. When the capacitors in each interphase compensation capacitor bank are switched at the same time, it is equivalent to the reactive power compensation effect of the co-compensation capacitor.

The split-phase compensation capacitor is a capacitor separately set between each phase and the N-phase in the three-phase AC busbar. Through switching control, the effect of reactive power compensation is achieved. In order to facilitate installation and maintenance, every three phase-splitting compensation capacitors, that is, every three phase-splitting capacitors between AN, BN, and CN are divided into a phase-splitting compensation capacitor bank, and each phase-splitting compensation capacitor can be switched independently Control, which is equivalent to the compensation effect of the sub-compensation capacitor.

The active compensation device consists of n active compensation modules, where n is greater than 1, the active compensation module is a static synchronous reactive power compensator or an active power filter, and one active compensation module is selected from the active compensation device as a centralized control device. The schematic diagram of the active compensation module as a centralized controller is shown in Figure 2, including the controller and internal power electronic devices. The controller controls and connects the internal power electronic devices, and the internal power electronic devices are used to provide active reactive power compensation. The controller is equipped with active module communication interface, capacitor control interface, fan intelligent control interface, man-machine interface interaction interface, external GPRS communication interface, device start-stop control interface, system voltage acquisition interface, system current acquisition interface, device current Acquisition interface and temperature detection acquisition interface. The communication interface between active modules is used to communicate with other active modules, the capacitor control interface is used to control and connect the phase-splitting compensation capacitors and phase-to-phase compensation capacitors in the passive compensation device, the fan intelligent control interface is used to control and connect cooling fans, man-machine The interface interaction interface is used to connect the display screen, the external GPRS communication interface is used to communicate with the remote monitoring system, the device start-stop control interface is used to connect the start-stop knob or button, and the system voltage acquisition interface is used to collect the system voltage connected to the station area. The current collection interface is used to collect the system current connected to the station area, the temperature detection collection interface is used to collect and connect the external temperature sensor, and the external temperature sensor is used to detect the external ambient temperature.

There is also a cooling fan connected to the power supply on the three-phase AC bus for cooling the active compensation device. Its capacity and quantity are determined by the heat dissipation required by the active compensation device and the heat dissipation of a single cooling fan. In order to prolong the service life of the cooling fan, the start and stop of the cooling fan can be controlled according to the change of the surrounding environment.

There is also a current transformer in the device, which is installed after auxiliary equipment such as surge protectors and heaters. The primary side is connected to the three-phase AC bus for detection, and the secondary side is connected to the device current of the active compensation module as a centralized controller. The acquisition interface is installed in the direction of the active compensation device and the passive compensation device from the incoming circuit breaker, and is used to detect n active compensation modules, m phase-to-phase compensation capacitor banks and k phase-splitting compensation capacitor banks sum of currents.

The active compensation module as a centralized controller is used to control the start and stop of the cooling fan according to the change of the ambient temperature, and select and control the active compensation device according to the current of the active compensation device and the passive compensation device collected by the current transformer. A corresponding number of active reactive power compensators perform active reactive power compensation, and select and control a corresponding number of phase-splitting compensation capacitor banks or phase-phase compensation capacitor banks in passive compensation devices for passive reactive power compensation, so as to realize all active compensation Device and passive compensation device status reading, compensation centralized control, protection and other control and data communication.

In this embodiment, the active compensation device includes a static synchronous compensator and an active power filter; as other implementation manners, only the static synchronous compensator or the active power filter may be used.

In this embodiment, the passive compensation device includes an interphase capacitor bank and a phase split capacitor bank; as other implementation manners, the passive compensation device may only use an interphase capacitor bank or a phase split capacitor bank.

In this embodiment, a heater is connected to the three-phase AC bus; as another implementation manner, if the ambient temperature of the device is relatively high, no heater may be provided.

In this embodiment, the centralized controller controls the connection of a heat dissipation fan; as other implementations, when the ambient temperature of the device is relatively low and heat dissipation is not required, no heat dissipation fan may be provided.

Active compensation module embodiment:

The active compensation module provided in this embodiment is the same as the active module used as the centralized controller in the above system embodiment, and has been introduced in detail above, so it will not be further explained here.

Claims (10)

1. a kind of central controlled power distribution station mixing compensation system, including be three-phase alternating current for connecting three-phase alternating current bus Bus provides the active power compensator of reactive-load compensation and Passively compensated device；Characterized in that, the active power compensator includes At least two active compensation modules, one of active compensation module are Centralized Controller；Active mould as Centralized Controller Block communication connects other active compensation modules, and controls connected with passive compensation device.

2. a kind of central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that described to have Source compensating module includes Static Synchronous reactive-load compensator and/or Active Power Filter-APF.

A kind of 3. central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that the nothing Source compensation device includes capacitive coupling device group and/or phase-splitting capacitor group.

4. a kind of central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that also include For detecting the current transformer of connection three-phase alternating current bus；It is mutual that active module embedded therein collection as Centralized Controller connects the electric current Sensor.

5. a kind of central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that also include For connecting the heater of three-phase alternating current bus, heater is used to heat for mixing compensation system.

A kind of 6. central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that the work Also control for the active compensation module of Centralized Controller and be connected with cooling fan, for being radiated for mixing compensation system.

7. a kind of central controlled power distribution station mixing compensation system according to claim 1, it is characterised in that also include For connecting the Surge Protector of three-phase alternating current bus, Surge Protector is used to prevent occurring surge electricity in three-phase alternating current bus Stream.

8. a kind of active compensation module, including controller, controller control is connected with internal power electronic device, internal power electricity Sub- device is used to provide active reactive-load compensation；Characterized in that, the controller is provided with communication interface and electric capacity between source module Device control interface, communication interface, which is used to communicate, between active module embedded therein connects other active compensation modules, and capacitor control interface is used for Control connected with passive compensation equipment.

9. a kind of active compensation module according to claim 8, it is characterised in that the controller is additionally provided with fan intelligent Control interface, cooling fan is connected for controlling.

10. a kind of active compensation module according to claim 8, it is characterised in that the controller is additionally provided with system electricity Acquisition interface, system power acquisition interface and device current acquisition interface are pressed, wherein system voltage acquisition interface is used for the company of collection The system voltage of taiwan area is connect, system power acquisition interface is used for the system power for gathering connection taiwan area, device current acquisition interface For gathering the electric current of connection mixed compensation device.