CN101630860B - Power-integration power-supply system and method for discharging storage batteries - Google Patents

Abstract

The invention discloses an electric integrated power supply system, which includes an AC/DC rectifier module, a storage battery pack, a DC/AC inverter module and a monitoring system for monitoring the work of each part, which are sequentially coupled by the output interface of the grid. A controllable on-off feed path set between the output end of the DC/AC inverter module and the output interface of the grid, when the battery pack needs to be discharged, the monitoring system turns off the AC/DC rectification module For the output of the battery pack, adjust the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage, then open the feed path, and then adjust the DC/AC inverter through closed-loop control The phase of the module's output current tracks the phase of the grid voltage. Also disclosed are a storage battery discharge method in an electric integrated power supply system, and corresponding battery activation, core capacity, and internal resistance detection methods. By adopting the invention, the effects of energy saving and environmental protection can be achieved when the storage battery in the electric integrated power supply system is maintained.

Description

Power integrated power supply system and storage battery discharge method

technical field

The invention relates to an electric integrated power supply system, in particular to an electric integrated power supply system and a storage battery discharging method.

Background technique

At present, the power integrated power supply system has been widely used in power plants, substations, industrial and mining enterprises, electrified railways, and high-rise buildings. Figure 1 is a typical power integrated power system, the system includes AC/DC rectification module, battery pack, DC/DC conversion module, DC/AC inverter module. Typically, the grid voltage is rectified into 220V or 110V DC voltage by the rectifier module to provide energy to the electric load and charge the battery pack. The DC/DC conversion module converts the high-voltage DC voltage to 48V DC voltage to provide energy to the communication load. The DC/AC inverter module converts direct current into alternating current to provide energy for emergency lighting. As an important part of the integrated electric power supply system, the battery needs maintenance after a period of use, recharging and discharging for activation, and the battery also needs to perform periodic nuclear capacity (check the actual capacity of the battery) discharge and internal resistance measurement. However, at this stage, the following three methods are generally used to discharge the battery for activation, nuclear capacity and measurement of internal resistance: 1. Use resistance as the load of the battery for discharge; 2. Use electronic discharge equipment for energy-consuming power electronic components for discharge ; 3. Use a dedicated active feedback device to feed back electric energy. The first two discharge methods have obvious disadvantages, that is, the electric energy of the battery is consumed in vain, and high heat radiation is generated, which has a fire hazard. The third discharge method is expensive because it requires special equipment.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art, to provide an integrated electric power supply system, which can realize the effective utilization of the discharge energy of the battery pack, save energy, and simplify the discharge process without generating high heat radiation , to achieve the effect of environmental protection.

The object to be achieved by the present invention is also to provide a battery discharge method in an electric integrated power supply system and a corresponding method for realizing on-line battery activation, nuclear capacity and internal resistance measurement.

To achieve the above object, the present invention adopts the following technical solutions:

An electric integrated power supply system, including an AC/DC rectifier module, a storage battery pack, a DC/AC inverter module, and a monitoring system for monitoring the work of each part, which are sequentially coupled by the grid output interface, and also includes the The controllable on-off feed path between the output terminal of the DC/AC inverter module and the output interface of the grid. When the battery pack needs to be discharged, the monitoring system closes the AC/DC rectification module to the battery. group output, adjust the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage, then open the feed path, and then adjust the output current of the DC/AC inverter module through closed-loop control The phase of the track tracks the phase of the grid voltage.

The DC/AC inverter module may be a power inverter or a power UPS.

Preferably, a DC/DC conversion module is also included, and the battery pack is connected to the DC/DC conversion module through a switch control.

A method for discharging a storage battery in an electric integrated power supply system, said system comprising an AC/DC rectifier module, a storage battery pack and a DC/AC inverter module sequentially coupled by a grid output interface, said method comprising the following steps:

a. Turn off the output of the AC/DC rectifier module to the battery pack;

b. adjusting the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage;

c. Connect the output end of the DC/AC inverter module to the grid output interface;

d. Adjusting the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control, so as to feed back active energy to the grid.

Preferably, in the step a, the output of the AC/DC rectification module to the battery pack is turned off by lowering the output voltage of the AC/DC rectification module or directly shutting down the power supply.

Preferably, in the step d, the discharge quantity of the battery pack is controlled according to the detection of the discharge current.

A method for realizing on-line battery activation in an electric integrated power supply system, comprising the step of discharging the battery according to the aforementioned method for discharging the battery.

A method for realizing on-line storage battery core capacity in an electric integrated power supply system, comprising the step of discharging the storage battery according to the aforementioned storage battery discharge method.

A method for realizing online storage battery internal resistance measurement in an electric integrated power supply system includes the step of discharging the storage battery according to the aforementioned storage battery discharge method.

A method for realizing energy saving in an electric integrated power supply system, comprising the step of discharging the storage battery according to the aforementioned storage battery discharging method.

The beneficial technical effect of the present invention is:

According to the present invention, when the battery pack needs to be discharged, the AC/DC rectifier module is controlled to turn off the charging output of the battery pack, and the amplitude and phase of the output voltage of the DC/AC inverter module are adjusted to be the same as the grid voltage , and then open the feeding path, and then adjust the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control, so as to feed back active energy to the grid. In this way, the DC power released by the battery pack is converted into AC power that can be fed back to the grid, so that the power of the battery is fed back to the grid through the DC/AC inverter module, and at the same time does not cause reactive power pollution to the grid. In this way, even if the discharge energy is effectively used , saves energy, and makes the discharge process simple and safe, without high heat radiation, so it is economical and environmentally friendly. By adopting the invention, the electric integrated power supply system can realize on-line storage battery activation, on-line nuclear capacity discharge and on-line storage battery internal resistance measurement.

Description of drawings

Figure 1 is a schematic structural diagram of a typical power integrated power supply system;

Fig. 2 is a schematic structural diagram of an electric power integrated power supply system according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an electric integrated power supply system according to another embodiment of the present invention;

Fig. 4 is a flow chart of the storage battery discharging method in the electric integrated power supply system of the present invention.

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

Detailed ways

As shown in Figure 2, an embodiment of an integrated electric power supply system includes an AC/DC rectifier module, a storage battery pack, a DC/AC inverter module and a monitoring system (not shown in the figure), and the input terminal of the AC/DC rectifier module is connected to the The output interface of the power grid is coupled, the output end of the AC/DC rectifier module is coupled with the positive and negative poles of the battery pack and the input end of the DC/AC inverter module, the output end of the DC/AC inverter module is coupled to the emergency lighting load, the battery The group and the output end of the AC/DC rectification module are controlled to connect to the electric load through the switch S2. The monitoring system is respectively coupled to each of the above-mentioned parts to monitor their work. Among them, the power grid can provide DC charging power to the battery pack through the AC/DC rectifier module, and the DC power output by the battery pack can be converted into AC power through the DC/AC inverter module and provided to emergency bright loads.

According to the present invention, a feed path is provided between the output end of the DC/AC inverter module and the grid output interface, and the on-off state of the feed path can be determined by controlling the on-off state of the switch S1. When the battery pack needs to be discharged, the monitoring system closes the output of the AC/DC rectifier module to the battery pack (stops charging), and can also close the output of the battery pack to the electric load directly powered by it (stops working and discharging) depending on the situation. And adjust the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage, and then close the switch S1, so that the output terminal of the DC/AC inverter module is connected to the grid output interface through the feed path, Open the feed path, and then adjust the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control, so that its output power can be fed back to the grid, and active energy can be fed back to the grid without reactive power pollution to the grid . Wherein, the output voltage of the AC/DC rectifier module to the battery pack can be turned off by lowering the output voltage of the AC/DC rectifier module or directly shutting down the battery pack. At this time, the backstop diode D reverses and the battery pack stops charging.

As shown in FIG. 3 , another embodiment of the integrated electric power supply system further includes a DC/DC conversion module, and the DC/DC conversion module is controlled and connected to the battery pack and the output end of the AC/DC rectification module through a switch S2 . The DC/DC conversion module converts high-voltage DC voltage into low-voltage DC voltage to provide energy for communication loads. When the battery pack needs to be discharged, the monitoring system may turn off the switch S2 according to the situation, thereby closing the output of the battery pack to the electric load and the DC/DC conversion module.

In some embodiments, the DC/AC inverter module may employ a power inverter. The power inverter usually has a boosted DC/DC structure inside. Similarly, adjust the amplitude and phase of the output voltage of the power inverter to be the same as the grid voltage, then close the switch S1, open the feeder path, and then adjust the phase of the output current of the power inverter to track the phase of the grid voltage through closed-loop control , so that it can feed back active energy to the grid without causing reactive power pollution to the grid.

In other embodiments, the power inverter can also be replaced by a power UPS.

In addition, the monitoring system can control the discharge energy of the battery by detecting the battery discharge current, so as not to cause problems such as excessive discharge of the battery.

The power integrated power supply system of the present invention converts the energy discharged by the storage battery into alternating current through the power inverter and feeds it back to the power grid without causing reactive power pollution to the power grid. The process becomes simple, does not generate high heat radiation, is economical and environmentally friendly.

In another aspect, the present invention also proposes a battery discharge method in an electric integrated power supply system, the system includes an AC/DC rectifier module, a battery pack and a DC/AC inverter module sequentially coupled by the grid output interface . As shown in Figure 4, the method includes the following steps:

Step S1, closing the output of the AC/DC rectification module to the battery pack;

Step S2, adjusting the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage;

Step S3, connecting the output terminal of the DC/AC inverter module with the grid output interface;

Step S4, adjusting the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control, so as to feed back active energy to the grid.

In step S1, the output of the AC/DC rectification module to the battery pack can be turned off by lowering the output voltage of the AC/DC rectification module or directly shutting down the power supply.

In step S4, the discharge quantity of the battery pack may be controlled by detecting the discharge current.

Various embodiments of the method can be specifically implemented with reference to the content of the foregoing system embodiments, and details are not repeated here.

The battery discharge method of the invention can be used to realize on-line battery activation, on-line nuclear capacity discharge and on-line battery internal resistance measurement. It should be understood that any battery maintenance method or energy-saving method using the battery discharge method of the present invention shall be covered by the protection scope of the present invention.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. An electric integrated power supply system, comprising an AC/DC rectifier module, a storage battery pack, a DC/AC inverter module and a monitoring system for monitoring the work of each part, which are sequentially coupled by the grid output interface, the DC/DC The output end of the AC inverter module is coupled to the emergency lighting load, and the feature is that the system also includes a controllable on-off feed path set between the output end of the DC/AC inverter module and the grid output interface , when the battery pack needs to be discharged, the monitoring system turns off the output of the AC/DC rectifier module to the battery pack, and adjusts the amplitude and phase of the output voltage of the DC/AC inverter module to the grid voltage Same, then open the feed path, and then adjust the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control. 2. The power integrated power supply system according to claim 1, wherein the DC/AC inverter module is a power inverter or a power UPS. 3. The electric integrated power supply system according to claim 1 or 2, further comprising a DC/DC conversion module, and the battery pack is connected to the DC/DC conversion module through a switch control. 4. A method for discharging storage batteries in an electric integrated power supply system, said system comprising an AC/DC rectifier module, a storage battery pack and a DC/AC inverter module sequentially coupled by a power grid output interface, said DC/AC inverter module The output terminal of the variable module is coupled to the emergency lighting load, wherein the method comprises the following steps: a. Turn off the output of the AC/DC rectifier module to the battery pack; b. adjusting the amplitude and phase of the output voltage of the DC/AC inverter module to be the same as the grid voltage; c. Connect the output end of the DC/AC inverter module to the grid output interface; d. Adjusting the phase of the output current of the DC/AC inverter module to track the phase of the grid voltage through closed-loop control, so as to feed back active energy to the grid. 5. The method according to claim 4, wherein in said step a, the AC/DC rectification module is turned off for said AC/DC rectification module by lowering the output voltage of said AC/DC rectification module or directly shutting down The output of the battery pack. 6. The method according to claim 4 or 5, characterized in that, in the step d, the discharge quantity of the battery pack is controlled according to the detection of the discharge current. 7. A method for realizing online battery activation in an electric integrated power supply system, characterized in that it comprises the step of discharging the battery according to the method of claim 4. 8. A method for realizing on-line storage battery nuclear capacity in an electric integrated power supply system, characterized in that it comprises the step of discharging the storage battery according to the method of claim 4. 9. A method for realizing online battery internal resistance measurement in an electric integrated power supply system, characterized in that it comprises the step of discharging the battery according to the method of claim 4. 10. A method for realizing energy saving in an electric integrated power supply system, characterized by comprising the step of discharging the storage battery according to the method of claim 4.

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