CN204696691U - A kind of modular harmonic wave control and reactive power compensator - Google Patents

Abstract

A kind of modular harmonic wave control of the utility model and reactive power compensator include sample instrument transformer TA1, load current of active power filter module group and Intelligent capacitor module group, power network current and to sample instrument transformer TA2 and human-computer interaction module; The two ends of described Intelligent capacitor module group and described Active Power Filter-APF module group are parallel with one another, wherein one end access electrical network, and the other end is connected by 485 communication buss; Described power network current sampling instrument transformer TA1 and load current sampling instrument transformer TA2 receives described Intelligent capacitor module group and Active Power Filter-APF module group by series system; Intelligent capacitor module group described in described human-computer interaction module is connected by 485 communication buss and Active Power Filter-APF module group, provide a kind of while compensating reactive power, effectively can administer harmonic problem again, effectively can also improve the quality of power supply, reach energy-saving and emission-reduction object, final modular harmonic wave control and the reactive power compensator effectively reducing energy loss.

Description

A modular harmonic control and reactive power compensation device

technical field

The utility model relates to a modular harmonic control and reactive power compensation device.

Background technique

In the power system, in order to reduce the power loss caused by the distribution network providing a large amount of reactive current to the load and compensating harmonics, it is necessary to configure corresponding voltage levels at each power receiving point (such as low-voltage transformers and large-scale electrical equipment installations). Reactive power compensation and harmonic control devices, industrial and mining, enterprises, and residential areas with low power factors must install reactive power compensation devices, large asynchronous motors, transformers, welding machines, presses and other equipment often also need to install reactive power compensation devices , in order to improve the transmission capacity of the power grid and the utilization rate of electric energy, improve the situation of electricity consumption, and save energy.

At present, the reactive power compensation and harmonic control adopted by various manufacturers mainly include thyristor switched capacitor (TSC), active power filter (APF) module and so on. TSC is based on the principle that a controller controls multiple capacitors through thyristor switches to realize reactive power compensation. The whole device is too large and inconvenient to install and maintain. When the controller fails, the whole device cannot compensate reactive power;

The expansion of TSC is inconvenient and cannot well meet the actual needs; the low reliability of the control system, and the high technical requirements for design, manufacture, and operation management are also major shortcomings.

A separate active power filter (APF) module can only control harmonics, but cannot compensate reactive power. In our power supply system, not only harmonic currents exist, but reactive power also exists in the power grid from time to time.

When capacitor compensation is installed separately in the grid, switching capacitors will affect the propagation of harmonics in the grid, and even cause harmonic amplification and resonance. When the grid harmonics are large, capacitor explosions will occur, causing a series of accidents. endanger personal safety.

According to online search, there is a combination device of TSC and active power filter module (APF), but its realization principle is simply to assemble TSC and APF in a cabinet mechanically, TSC and active filter Work independently, and the shortcomings of the above-mentioned TSC still exist, installation and maintenance are inconvenient, and the operation reliability is low.

Utility model content

The disclosed purpose of the utility model is to solve the limitations of the above-mentioned existing reactive power compensation device, to provide a device that can effectively control the harmonic problem while compensating reactive power, and can also effectively improve the power quality, so as to achieve the purpose of energy saving and emission reduction, and finally Modular harmonic control and reactive power compensation device that can effectively reduce energy loss.

The utility model includes an active power filter module group and an intelligent capacitor module group, a grid current sampling transformer TA1, a load current sampling transformer TA2 and a human-computer interaction module; the intelligent capacitor module group and the active power The two ends of the filter module group are connected in parallel, one end is connected to the power grid, and the other end is connected through the 485 communication bus; the grid current sampling transformer TA1 and the load current sampling transformer TA2 are connected to the smart capacitor in series The module group and the active power filter module group; the human-computer interaction module is connected to the smart capacitor module group and the active power filter module group through the 485 communication bus.

After adopting the above structure, the utility model has the following advantages compared with the prior art:

The utility model relates to a modular harmonic control and reactive power compensation device, which adopts the combination mode of an active power filter module group and an intelligent capacitor module group, and the harmonic current on the load side first passes through the active power filter module group Filter harmonics, and then perform reactive power compensation through the intelligent capacitor module group, avoiding the amplification of grid harmonics during reactive power compensation, and improving the quality of grid power. The utility model has the advantages of simple structure, convenient operation and high degree of automation. It adopts a modular design to maximize user stability. The modular product realizes the concept of components, and the design is convenient for communication. It can be used in conjunction with various cabinets and is modularized. Product design makes maintenance easier.

A modular harmonic control and reactive power compensation device is flexible in combination according to capacity configuration, easy to install, easy to expand, and easy to maintain; a modular harmonic control and reactive power compensation device has complete protection functions and has overvoltage and undervoltage , over-current, over-temperature and a series of protection. The utility model provides a modularized harmonic control and reactive power control system that can effectively control the harmonic problem while compensating for reactive power, effectively improve the power quality, achieve the purpose of energy saving and emission reduction, and finally effectively reduce energy loss. compensation device.

As an improvement, the intelligent capacitor module group includes at least two intelligent capacitor modules, and the intelligent capacitor modules are connected in parallel with each other. The intelligent capacitor module group can switch capacitors on demand, and capacitors with the same capacity adopt the principle of cycle switching to avoid affecting the life of the same capacitor by repeated switching;

As an improvement, the active power filter module set includes at least two active power filter modules, and the active power filter modules are connected in parallel with each other. The active power filter module group can include modules of different capacities to meet the needs of different capacities.

A modular harmonic control and reactive power compensation device forms a unified intelligent communication network through the 485 interface. When the device is turned on and powered on, each module has no master-slave distinction. It is necessary to distinguish the master-slave by automatically identifying competing hosts to ensure There is only one host in the network. The information of the remaining slaves is collected by the master to form an information list of intelligent communication, and finally accurately control the reactive power compensation function of the network according to the requirements of reactive power scheduling. Regardless of any module failure, it can automatically exit the operation, and the remaining modules form a new network to operate normally. Modular products can also meet various capacity requirements; a modular harmonic control and reactive power compensation device can be flexibly combined according to capacity configuration, easy to install, easy to expand, and easy to maintain; a modular harmonic control and reactive power compensation device The protection function of the compensation device is complete, with a series of protections such as overvoltage and undervoltage, overcurrent and overtemperature.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

As shown in Figure 1, the utility model includes an active power filter module group and an intelligent capacitor module group, a grid current sampling transformer TA1, a load current sampling transformer TA2 and a human-computer interaction module; the intelligent capacitor module group and the The two ends of the active power filter module set are connected in parallel, one end is connected to the grid, and the other end is connected through the 485 communication bus; the grid current sampling transformer TA1 and the load current sampling transformer TA2 are connected in series. The intelligent capacitor module set and the active power filter module set; the human-computer interaction module is connected to the intelligent capacitor module set and the active power filter module set through a 485 communication bus. The intelligent capacitor module group includes at least two intelligent capacitor modules, and the intelligent capacitor modules are connected in parallel with each other. The active power filter module set includes at least two active power filter modules, and the active power filter modules are connected in parallel with each other.

Among them, the human-computer interaction module is a set of high-performance integrated touch screen controller with embedded CPU as the core, which can realize the functions of setting, reading and recording the operating parameters of the equipment, and communicate with the background in real time. Real-time display of power information, data before and after compensation, and waveform diagrams, control and monitor the working status of APF and smart capacitor modules, and flexibly realize the combination mode of APF and smart capacitor modules with different capacities; The switching times, equipment running time, historical operations, historical warnings, and APF running switching conditions are recorded; the human-computer interaction module can provide multiple protection functions, compensation mode setting functions, and remote communication functions.

The active power filter module group processes the harmonics in the system, and there are few harmonics flowing into the capacitor; the active power filter module group adopts a modular design structure, and can be paralleled according to requirements, which is convenient for assembly; The power filter module group can control and actively output the magnitude, frequency and phase of the current by sampling the load current and separating the harmonics and reactive power, and respond quickly to offset the corresponding current in the load, realizing dynamic tracking and compensation. wave; the active power filter module group has five capacity modules of 25-100A. Any capacity combination can be paralleled to meet different capacity requirements. Any module can realize all functions. If a module has a problem, the rest of the modules can operate normally. Ensure the continuity of safe operation of the system.

The smart capacitor module set is in the form of modularization, adopts advanced microelectronic software and hardware technology, and perfectly combines the DSP measurement and control unit with the three-phase synchronous switch to realize equal voltage input and current zero-crossing cutoff of low-voltage power capacitors. The intelligent capacitor module group is composed of multiple intelligent capacitor modules, including three-phase compensation intelligent capacitors and phase-splitting compensation intelligent capacitors.

The active power filter module group and the smart capacitor module group are connected to the power grid using a parallel structure, and the power grid current sampling transformer TA1 is connected to the man-machine interface. Effect. The load current sampling transformer TA2 is connected in series to the smart capacitor module group and the active power filter module group to determine the magnitude of the reactive current and control the output of the active power filter module and the smart capacitor module.

The utility model utilizes the intelligent capacitor module to compensate and provide reactive power, and the active power filter module to perform harmonic control has many advantages, such as no resonance with the system; the system power factor is guaranteed to be above 0.99, and the harmonic control effect is good; Fast and responsive tracking of load changes; long product life, low failure rate, and low post-maintenance costs.

A modular harmonic control and reactive power compensation device of the utility model adopts intelligent communication, and the active power filter module group and the intelligent capacitor module group form the same network and work together. The damage of a certain module does not affect the system function, and the work is improved. efficiency.

The utility model fully combines the advantages of the intelligent capacitor module and the active power filter module, provides the most cost-effective solution for reactive power compensation and harmonic control, and fully meets the needs of users.

The above only illustrates the best embodiments of the present utility model, but should not be construed as a limitation on the claims. The utility model is not limited to the above embodiments, and all the various changes made within the protection scope of the independent claims of the utility model are all within the protection scope of the utility model.

Claims (3)

1. modular harmonic wave control and a reactive power compensator, is characterized in that: include sample instrument transformer TA1, load current of active power filter module group and Intelligent capacitor module group, power network current and to sample instrument transformer TA2 and human-computer interaction module; The two ends of described Intelligent capacitor module group and described Active Power Filter-APF module group are parallel with one another, wherein one end access electrical network, and the other end is connected by 485 communication buss; Described power network current sampling instrument transformer TA1 and load current sampling instrument transformer TA2 receives described Intelligent capacitor module group and Active Power Filter-APF module group by series system; Intelligent capacitor module group described in described human-computer interaction module is connected by 485 communication buss and Active Power Filter-APF module group.

2. the modular harmonic wave control of one according to claim 1 and reactive power compensator, is characterized in that: described Intelligent capacitor module group comprises at least two Intelligent capacitor modules, parallel with one another between described Intelligent capacitor module.

3. the modular harmonic wave control of one according to claim 1 and reactive power compensator, it is characterized in that: described Active Power Filter-APF module group comprises at least two Active Power Filter-APF modules, parallel with one another between described Active Power Filter-APF module.