CN207098620U - The mixed compensation device and its integrated controller and active compensation module of master ＆ slave control - Google Patents

Abstract

The utility model provides a kind of the mixed compensation device and its integrated controller and active compensation module of master ＆ slave control, and mixed compensation device includes being used to connect the active power compensator of three-phase alternating current bus and Passively compensated device；At least two active compensation modules are provided with the active power compensator, for providing active reactive-load compensation；Connection is communicated between each active module embedded therein, one of active module embedded therein is main frame；The Passively compensated device includes integrated controller and Passively compensated equipment, is connected between integrated controller and each active module embedded therein by bus communication, and reactive-load compensation equipment is used to provide Passive Reactive Power Compensation.Technical scheme provided by the utility model, connection is communicated between each active controller, even if some active controller breaks down, other active controllers can be used as main frame, all active power compensators and Passively compensated device are controlled, the normal operation of device is not interfered with, so as to improve the reliability of device.

Description

Hybrid compensation device with master-slave control and its integrated controller and active compensation module

technical field

The utility model belongs to the technical field of reactive power compensation in electric power systems, and in particular relates to a master-slave control hybrid compensation device, a comprehensive controller and an active compensation module.

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 imbalance 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, there is only one active compensation module in the three-phase AC bus, which can provide limited amount of reactive power compensation, and the adjustability and applicability are relatively poor. Moreover, the active compensation module has only one controller. If the controller fails, the entire compensation device cannot work normally, so the reliability of this compensation device is poor.

Utility model content

The purpose of this utility model is to provide a master-slave control hybrid compensation device and its integrated controller and active compensation module, which are used to solve the above-mentioned problem of poor reliability in the compensation and treatment of power quality problems in the power system.

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

A master-slave controlled distribution station hybrid compensation system, including an active compensation device and a passive compensation device for connecting a three-phase AC bus; the active compensation device is provided with at least two active compensation modules, It is used to provide active reactive power compensation; the communication connection between each active module, one of the active modules is the host; the passive compensation device includes an integrated controller and passive compensation equipment, the integrated controller and each active module They are connected through bus communication, and the reactive power compensation equipment is used to provide passive reactive power compensation.

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 heater for connecting to the three-phase AC bus, for heating the hybrid compensation system.

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 integrated controller is provided with a master-slave control interface and a capacitor control interface, wherein the master-slave control interface is used to connect a host computer, and the capacitor control interface is used to connect passive compensation equipment.

Further, the integrated controller is also provided with a man-machine interface and an external communication interface, wherein the man-machine interface is used to connect to the display screen, and the external communication interface is used to communicate with the remote monitoring system.

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

An active compensation module, including a controller, the controller is connected with an internal power electronic device, and the internal power electronic device is used to provide active and reactive power compensation; the controller is also provided with a communication interface between active modules and a master-slave The control interface, the active module interface is used to communicate with other active modules, and the master-slave control interface is used to communicate with the integrated controller. Among them, the active module control interface and the master-slave control interface can be separated separately, or by adding After the related protocol, the two control channels are combined into one channel for control. At this time, after the master is damaged, one of the original active module slaves will be used as the master to re-complete the control work of the original master to improve the fault tolerance and reliability of the system. sex

Further, the controller is also provided with a fan control interface and a complete machine protection interface, the fan control interface is used to control the connection to the cooling fan, and the complete machine protection interface is used to control the connection to the incoming circuit breaker.

The beneficial effects of the utility model are: the utility model provides a master-slave control distribution station hybrid compensation system, which sets communication connections between each active module, selects one of the active modules as the host, and controls other active modules. The active module is controlled by the integrated controller; due to the communication connection between the active modules, any active module can be used as the host. If the active module currently used as the host fails, other active modules can be used as the host. The host is controlled, which will not affect the normal operation of the device, thereby improving the reliability of the device.

Description of drawings

Fig. 1 is the structural schematic diagram of the master-slave control distribution station mixed compensation device in the embodiment;

Fig. 2 is the schematic diagram of the active controller in the embodiment;

Fig. 3 is a schematic diagram of the centralized controller in the embodiment.

Detailed ways

The purpose of the utility model is to provide a master-slave control hybrid compensation device and its integrated controller and active compensation module, which are used to solve the problem of poor reliability 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 master-slave controlled distribution station hybrid compensation system, including an active compensation device and a passive compensation device for connecting a three-phase AC bus; the active compensation device is provided with at least two active compensation modules, It is used to provide active reactive power compensation; the communication connection between each active module, one of the active modules is the host; the passive compensation device includes an integrated controller and passive compensation equipment, the integrated controller and each active module They are connected through bus communication, and the reactive power compensation equipment is used to provide passive reactive power compensation.

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

System embodiment:

This embodiment provides a master-slave control hybrid compensation system for distribution stations. Its structural schematic diagram is shown in Figure 1. The device is equipped with a three-phase AC busbar, and each phase of the AC busbar is connected to the power distribution station through the incoming circuit breaker. For the three-phase power supply connection in the station area, 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, a heater and a cooling fan.

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 active compensation device is composed of n active modules, where n is greater than 1, and each active module is a static synchronous reactive power compensator or an active power filter, and one of the active modules is selected as the host. For the convenience of maintenance, the size, structure and function of each active module are set to be exactly the same, and after a simple setting, they can be used interchangeably.

The passive compensation device includes an integrated controller and passive compensation equipment. The integrated controller controls and connects the passive compensation equipment, and communicates with each active and reactive power compensation equipment through the 485 bus. The passive compensation equipment includes m interphase compensation capacitor banks and k phase split compensation capacitor banks, where both m and k are greater than 1.

The active module provided by this embodiment is shown in FIG. 2 , and includes internal power electronic devices and a controller. 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 also equipped with an active module interface, the first master-slave control interface, the first fan intelligent control interface, the whole machine protection interface, the first man-machine interface interaction interface, the first external GPRS communication interface, and the first device start-stop control interface, the first temperature detection acquisition interface, the first device current acquisition interface, the first system current acquisition interface and the first system voltage acquisition interface. Among them, the active module interface is used to communicate with other active modules, the first master-slave control interface is used to communicate with the integrated controller, the first fan intelligent control interface is used to control and connect the cooling fan, and the first machine protection interface is used to control Connect the incoming circuit breaker, the first human-machine interface interactive interface is used to connect the display screen, the first external GPRS communication interface is used to communicate with the remote monitoring system, the first device start-stop control interface is used to connect the start-stop knob or button, the second The first system voltage acquisition interface is used to collect the system voltage connected to the station area, the first system current acquisition interface is used to collect the system current of the station area, the first device current acquisition interface is used to collect the current of the hybrid compensation device, and the first temperature detection acquisition The interface is used to connect an external temperature sensor.

The integrated controller provided by this embodiment is shown in Figure 3, including a second master-slave control interface, a capacitor control interface, a capacitor protection device, a second man-machine interface interaction interface, a second external GPRS communication interface, and a device startup control interface , the second system voltage acquisition interface, the second system current acquisition interface and the second device current acquisition interface. Among them, the second master-slave control interface is used to communicate with the active module as the host, the capacitor control interface is used to control and connect passive compensation equipment, the second man-machine interface interactive interface is used to connect the display screen, and the second external GPRS communication interface is used For communication connection with the remote monitoring system, the second device startup control interface is used to connect the start-stop knob or button, the second system voltage acquisition interface is used to collect the system voltage connected to the station area, and the second system current acquisition interface is used to collect the station area System current, the current collection interface of the second device is used to collect the current of the hybrid compensation device.

In this embodiment, the passive compensation equipment includes phase-to-phase compensation capacitors and phase-splitting compensation capacitors. The phase-to-phase compensation capacitors are capacitors connected between two phases of the three-phase AC bus, and the active power of the two-phase AC buses is realized through switching control. The transfer of power and reactive power achieves the effect of compensating reactive power and balancing 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, and 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 set separately 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.

There is also a cooling fan connected to the power supply on the three-phase AC bus for cooling the active compensation module. 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, and is connected to the active compensation device and passive compensation device to detect the current of the active compensation device and passive compensation device. , the installation direction is directed from the incoming circuit breaker to the direction of the active compensation device and the passive compensation device.

The active compensation device adopts master-slave control, that is, select an active compensation module as the master, and other active reactive power compensators and integrated controllers as slaves. When the active compensation device and the passive compensation device are working at the same time, the host computer will pass the reactive power, overvoltage, low voltage, three-phase unbalance and harmonic current according to the collected system voltage, system side current, and output current data of the hybrid compensation device. The fast compensation algorithm for power quality problems, etc., obtains the total active compensation amount and capacitor compensation amount, and sends them to all active modules and integrated controllers as slaves, and the active modules as slaves control the corresponding active The active reactive power compensation is performed by the source reactive power compensator, and the integrated controller controls the capacitor switching in the passive compensation device according to the compensation amount of the capacitor to perform passive reactive power compensation.

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.

Integrated controller embodiment:

The integrated controller provided in this embodiment is the same as the integrated controller provided in the above-mentioned system embodiment, which has been described in detail above, and will not be further explained here.

Active compensation module embodiment:

An active compensation module provided in this embodiment is the same as the active compensation module provided in the above-mentioned system embodiment, which has been described in detail above, and will not be further described here.

Claims (10)

1. a kind of power distribution station mixing compensation system of master ＆ slave control, including the active compensation for connecting three-phase alternating current bus fill Put and Passively compensated device；Characterized in that, at least two active compensation modules are provided with the active power compensator, for carrying It is provided with source reactive-load compensation；Connection is communicated between each active module embedded therein, one of active module embedded therein is main frame；The Passively compensated device Including integrated controller and Passively compensated equipment, connected between integrated controller and each active module embedded therein by bus communication, it is idle Compensation equipment is used to provide Passive Reactive Power Compensation.

2. the power distribution station mixing compensation system of a kind of master ＆ slave control 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. power distribution station mixing compensation system of master ＆ slave control according to claim 1, it is characterised in that the nothing Source compensation equipment includes capacitive coupling device group and/or phase-splitting capacitor group.

4. the power distribution station mixing compensation system of a kind of master ＆ slave control according to claim 1, it is characterised in that also include For connecting the heater of three-phase alternating current bus, for being heated for mixing compensation system.

5. the power distribution station mixing compensation system of a kind of master ＆ slave control 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.

6. a kind of integrated controller, it is characterised in that the integrated controller is provided with master ＆ slave control interface and capacitor control connects Mouthful, wherein master ＆ slave control interface is used to connect main frame, and capacitor control interface is used for connected with passive compensation equipment.

7. a kind of integrated controller according to claim 6, it is characterised in that integrated controller is additionally provided with man-machine interface friendship Mutual interface and external communication interface, wherein man-machine interface interactive interface are used to connect display screen, and external communication interface is used to communicate Connect remote monitoring system.

8. a kind of integrated controller according to claim 6, it is characterised in that integrated controller is additionally provided with system voltage and adopted Collect interface, system power acquisition interface and device current acquisition interface, wherein system voltage acquisition interface is used to gather taiwan area System voltage, system power acquisition interface are used for the system power for gathering taiwan area, and device current acquisition interface, which is used to gather, to be mixed The electric current of compensation device.

9. a kind of active compensation module, it is characterised in that including controller, controller control is connected with internal power electronics device Part, internal power electronic device are used to provide active reactive-load compensation；The controller be additionally provided between active module embedded therein communication interface and Master ＆ slave control interface, active module embedded therein interface, which is used to communicate, connects other active module embedded thereins, and it is comprehensive that master ＆ slave control interface is used for communication connection Hop controller.

10. a kind of active compensation module according to claim 9, it is characterised in that the controller is additionally provided with blower fan control Interface processed and complete machine protection interface, air-blower control interface are used to control connection cooling fan, and complete machine protection interface is used for the company of control Connect lead-in circuit breaker.