CN204131130U - A kind of battery saving arrangement based on intelligent AC electrical network - Google Patents

Abstract

The utility model relates to a power-saving device based on an intelligent AC power grid, comprising: a non-contact voltage regulator TY, an automatic bypass unit PL, a power-saving control unit KZ, and a capacitor C; the non-contact voltage regulator TY is connected to an automatic The bypass unit PL, the power-saving control unit KZ, and the capacitor C are connected, and the voltage is adjusted through the non-contact voltage regulator TY according to the peripheral conditions to enter the state of power-saving and voltage regulation; the automatic bypass unit PL and the power-saving control unit KZ Connection; power-saving control unit KZ and capacitor C in parallel. The utility model adopts the non-contact on-load voltage regulation technology with the transformer as the core, the output waveform has no distortion, and no harmonic pollution is generated, so that the load carried by the power grid is safer, more reliable, more environmentally friendly and more efficient, and has the advantages of improving the power factor of the power grid, Reduce the three-phase unbalance and other characteristics, and solve the problem of electric energy waste caused by large changes in the remote load current of the power grid.

Description

A power saving device based on smart AC power grid

technical field

The utility model relates to an electricity-saving device, in particular to an electricity-saving device based on an intelligent AC power grid.

Background technique

At present, the "umbrella effect" phenomenon exists to varying degrees in most AC power grids. The "umbrella effect" phenomenon is that when the power plant or substation is the center to transmit power energy to the remote end (including the theoretical farthest point in the power supply ring network), in order to make the terminal voltage meet the standard requirements, the initial power supply at the central position must be increased. As a result, the closer the user is to the power source, the higher the terminal voltage is; on the contrary, if the user voltage near the originating end of the power grid meets the standard requirements, the voltage at the far end of the same power grid will be lower; and these voltages are It changes with the change of grid current. At present, the tap terminals of most user transformers are debugged and fixed at one time according to the maximum design capacity of the power grid, which cannot solve the problem of power waste caused by large changes in the remote load current of the power grid. In fact, in those places that are close to power plants or substations, the "umbrella effect" phenomenon makes most electrical appliances receive a power supply voltage much higher than their rated voltage, making them in a state of overvoltage operation for a long time In addition, most high-voltage and high-power motors are running, especially in the process of dragging mechanical loads of low-density media (such as fans, liquid pumps, etc.), often because they cannot be used at any time according to demand. Reducing that part of the output power that is not needed leads to a large amount of wasted power over time.

Utility model content

In order to overcome the above disadvantages, the utility model aims to provide an energy-saving device based on an intelligent AC power grid. The device adopts a non-contact on-load voltage regulation technology with a transformer as the core, and the output waveform has no distortion and does not generate Harmonic pollution makes the load carried by the grid safer, more reliable, more environmentally friendly and more efficient, and has the characteristics of improving the power factor of the grid and reducing the three-phase unbalance.

The utility model achieves the above-mentioned purpose through the following technical solutions: a power-saving device based on an intelligent AC power grid, including: a non-contact voltage regulator TY, an automatic bypass unit PL, a power-saving control unit KZ, and a capacitor; The voltage regulator TY is respectively connected with the automatic bypass unit PL, the power saving control unit KZ, and the capacitor; the automatic bypass unit PL is connected with the power saving control unit KZ; the power saving control unit KZ is connected in parallel with the capacitor.

Preferably, the power-saving control unit KZ includes a power-saving controller, an inductance coil N ₁ , an inductance coil N ₂ , and an impedance Z; the power-saving controller is connected to the inductance coil N ₁ , the inductance coil N ₂ , and the impedance Z; The inductance coil _N1 is connected in series with the inductance coil _N2 , and the inductance coil _N1 and the inductance coil _N2 are connected in parallel with the impedance Z after being connected in series.

Preferably, the automatic bypass unit PL includes a switch J ₁ and a switch J ₂ ; the switch J ₁ is connected in parallel with the switch J ₂ for selecting different circuits.

Preferably, the non-contact voltage regulator TY includes two transformer coils and several resistance switch units, and the two transformer coils are connected in parallel with the several resistance switch units.

Preferably, the resistance switch unit includes a resistor R _i1 and two switches K _i1 , K _i ; the resistor R _i1 is connected in series with the switch _K i1 , and the resistor R _i1 and the switch K _i1 are connected in parallel with the switch K _i .

The beneficial effects of the utility model are: (1) the output waveform of the device has no distortion, no harmonic pollution will be generated, and the load carried by the power grid is safer, more reliable, more environmentally friendly and more efficient; (2) it can improve the power factor of the power grid, reduce (3) Solve the problem of power waste caused by large changes in the remote load current of the power grid.

Description of drawings

Fig. 1 is the topological structure of the utility model device;

Fig. 2 is the electricity-saving control unit KZ circuit of the utility model device;

Fig. 3 is the automatic bypass unit PL circuit of the utility model device;

Fig. 4 is the circuit of the non-contact voltage regulator TY of the utility model device;

Fig. 5 is the voltage regulation scheme of the utility model device below 0.4kV grid voltage.

Detailed ways

The utility model is further described below in conjunction with specific embodiment, but protection scope of the utility model is not limited thereto:

Embodiment: As shown in Figure 1, a power-saving device based on a smart AC power grid is composed of a non-contact voltage regulator TY, an automatic bypass unit PL, a power-saving control unit KZ, and a capacitor C; the non-contact voltage regulator The device TY is connected with the automatic bypass unit PL, the power-saving control unit KZ, and the capacitor C respectively, and the voltage is adjusted through the non-contact voltage regulator TY according to the peripheral conditions to enter the state of power-saving and voltage regulation; the automatic bypass unit PL is connected with the The power-saving control unit KZ is connected, and the current flows from the automatic bypass unit PL to the power-saving control unit KZ; the power-saving control unit KZ is connected in parallel with the capacitor C.

The circuit of the power-saving control unit KZ of the utility model device is shown in Figure 2. It is mainly composed of two inductance coils N ₁ , N ₂ , impedance Z, and a power-saving controller. The two inductance coils N ₁ and N ₂ are connected in series And in parallel with the impedance Z. Since the inductance coil N ₁ and the inductance coil N ₂ and the voltage and current coils of the other two phases are respectively wound on the three core columns that are mutually magnetic flux circuits, there is self-inductance and mutual inductance among the six groups of coils, so the formed The total inductance _L2 of the current coils of each phase has an inductive reactance effect on the high-energy high-frequency transients in the main circuit. Vector analysis shows that the phase difference between the self-inductance potential ΔU and the input voltage _Ui in the same phase as the output voltage U ₀ is 180°, ΔU will induce a current Δi lagging U ₀ 90° on L ₂ , and Δi lags behind U _i 270°, that is, Δi leads U _i by 90°, which is a capacitive current, which can compensate part of the inductive current in the load current I _i . Therefore, the device has the function of instantaneously improving the load power factor. In addition, the vector sum of the magnetic flux in the three-phase iron core is always zero during operation, so that the output current has the effect of suppressing the input three-phase unbalance.

As shown in Fig. 3, the automatic bypass unit PL is composed of two switches _J1 and _J2 connected in parallel, and different circuits can be selected according to the closing of the corresponding switches.

As shown in FIG. 4 , the non-contact voltage regulator TY mainly consists of two transformer coils BL and GB and n resistance switch units connected in parallel. Each resistive switching unit It is formed by connecting a resistor R _i1 in series with a switch K _i1 and connecting another switch K _i in parallel.

Specific operation method: when the ① unit K ₁ is closed and the ② unit K ₂ is closed, the sequence of operation and shifting should be: 1. K ₁₂ is closed; 2. K ₂ is closed; 3. K ₁ is disconnected; 4. _K12 is disconnected. On the contrary, the sequence when switching from the closing of the ② unit K ₂ to the closing of the ① unit K ₁ is: 1, K ₁₂ is open; b, K ₁ is open; 3, K ₂ is closed; 4, K ₁₂ is closed, and then And so on.

As shown in Figure 5 is the voltage regulation scheme diagram of the utility model device below 0.4kV grid voltage. Before the device enters the power saving and voltage regulation state, the default automatic bypass unit PL of the system is in the bypass state, that is, J ₁ is closed and J ₂ is open. , in the case of only one single motor load, the motor should be started at full voltage first. Afterwards, the device enters the power-saving state only after the peripheral conditions permit, that is, the voltage at both ends of the current coil _N2 is adjusted to a gear differential pressure, so far, the voltage regulating mechanism starts to operate. For the comprehensive load of the regional power grid, KZ will directly determine whether to enter the state of power saving and voltage regulation according to the external conditions. The multi-tap autotransformer is a voltage regulating unit TY. When adjusting and exchanging each tap so that the voltage variation on _N1 is 1% or less relative to the input voltage _Ui , it can be roughly regarded as continuously adjusting the output voltage _U0 , _U0 =U _i -ΔU, where ΔU=U _i [N ₂ /(N ₁ +N ₂ )], so U ₀ =U _i {1-[N ₂ /(N ₁ +N ₂ )]}, when in TY When the solid state relay SSR (Solid State Relay) switching element matrix is selected by the control program to connect a certain gear tap of N ₁ , then ΔU is a fixed value. The three-phase SSR selects the components that switch according to the command and the AC zero point to ensure the safety of the system.

The above description is the specific embodiment of the utility model and the technical principles used. If the changes made according to the concept of the utility model, the functions produced by it still do not exceed the spirit covered by the specification and accompanying drawings, Still should belong to the protection domain of the present utility model.

Claims (5)

1. A power-saving device based on an intelligent AC power grid, characterized in that it comprises: non-contact voltage regulator TY, automatic bypass unit PL, power-saving control unit KZ, capacitor; non-contact voltage regulator TY is connected with automatic The bypass unit PL, the power-saving control unit KZ, and the capacitor are connected; the automatic bypass unit PL is connected with the power-saving control unit KZ; the power-saving control unit KZ is connected in parallel with the capacitor. 2. A power-saving device based on a smart AC power grid according to claim 1, wherein the power-saving control unit KZ includes a power-saving controller, an inductance coil N ₁ , an inductance coil N ₂ , and an impedance Z The energy-saving controller is connected to the inductance coil N ₁ , the inductance coil N ₂ , and the impedance Z respectively; the inductance coil N ₁ is connected in series with the inductance coil N 2 , and the inductance coil _{N 1 and} the inductance coil N ₂ are connected in series and connected in parallel with the impedance Z. 3. A power-saving device based on a smart AC grid according to claim 1, wherein the automatic bypass unit PL includes a switch J ₁ and a switch J ₂ ; the switch J ₁ is connected in parallel with the switch J ₂ , used to select different circuits. 4. A power-saving device based on a smart AC grid according to claim 1, characterized in that: said non-contact voltage regulator TY includes two transformer coils and several resistance switch units, two transformers The pressure coil is connected in parallel with several resistance switch units. 5. A kind of energy-saving device based on intelligent AC power grid according to claim 4, characterized in that: said resistance switch unit comprises a resistance R _i1 and two switches K _i1 , K _i ; resistance R _i1 and switch K _i1 is connected in series, and the resistor R _i1 and the switch K _i1 are connected in parallel with the switch K _i .