CN216720928U - Voltage control device - Google Patents
Voltage control device Download PDFInfo
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- CN216720928U CN216720928U CN202123255841.1U CN202123255841U CN216720928U CN 216720928 U CN216720928 U CN 216720928U CN 202123255841 U CN202123255841 U CN 202123255841U CN 216720928 U CN216720928 U CN 216720928U
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Abstract
The utility model discloses a voltage control device, which relates to the technical field of new energy, and comprises an acquisition circuit, a measurement circuit, a first communication circuit, a second communication circuit and a voltage control module; the input end of the acquisition circuit is connected to a new energy power station grid-connected point in a hard wiring mode, the output end of the acquisition circuit is connected with the voltage control module through the measurement circuit, the input end of the first communication circuit is connected with the dispatching master station, the output end of the first communication circuit is connected with the voltage control module, and the output end of the voltage control module is connected with the dynamic reactive power compensation device, the photovoltaic inverter or the fan through the second communication circuit for communication, so that the new energy power station participates in power grid voltage regulation.
Description
Technical Field
The utility model relates to the technical field of new energy, in particular to a voltage control device.
Background
Because the new energy has the characteristics of randomness, intermittence, periodicity and volatility, when a large-capacity new energy power generation system is connected with a power grid in a grid operation mode, great difficulty is brought to control of system section exchange power, and the voltage of a distribution network and a high-voltage transmission network is influenced.
In the process of new energy source growth, due to the fact that the self voltage regulation capacity is insufficient, potential risks are formed for stable operation of a power system, the new energy source should participate in voltage control of a power grid, especially voltage control in the transient process, and the voltage operation safety of the power grid is improved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is how to realize that the new energy participates in the voltage regulation of the power grid.
The utility model solves the technical problems through the following technical means:
a voltage control apparatus is employed, the apparatus comprising: the device comprises an acquisition circuit, a measurement circuit, a first communication circuit, a second communication circuit and a voltage control module;
the input end of the acquisition circuit is connected into a new energy power station grid-connected point in a hard wiring mode, the output end of the acquisition circuit is connected with the voltage control module through the measurement circuit, the input end of the first communication circuit is connected with a dispatching master station, the output end of the first communication circuit is connected with the voltage control module, and the output end of the voltage control module is connected with the second communication circuit, the dynamic reactive power compensation device, the photovoltaic inverter or the fan for communication.
The acquisition circuit acquires new energy power station grid-connected points in a hard wiring mode, acquires voltage and current signals and outputs the voltage and current signals to the measurement circuit, the measurement circuit converts the voltage and reactive power of the power station grid-connected points according to the voltage and current signals output by the acquisition circuit to output voltage and reactive power data to the voltage control module, the first communication circuit sends voltage and reactive power commands issued by the power grid dispatching master station to the voltage control module, the voltage control module obtains a single-machine reactive power regulation command according to the voltage and reactive power data sent by the measurement circuit and the voltage and reactive power commands sent by the first communication circuit, and issues the command to each dynamic reactive power compensation device, inverter or fan, so that the new energy power station can participate in power grid voltage regulation.
Furthermore, the acquisition circuit comprises a voltage/current transformer and a first analog-to-digital converter, the output end of the voltage/current transformer is connected with a protection diode in parallel, a first capacitor and a second capacitor are connected with two ends of the protection diode in parallel, the second capacitor is connected with the input end of the first analog-to-digital converter through a common-mode inductor, and the output end of the first analog-to-digital converter is connected with the measurement circuit.
Furthermore, the measuring circuit comprises a filter circuit and a second analog-to-digital converter, wherein the input end of the filter circuit is connected with the output end of the first analog-to-digital converter, and the output end of the filter circuit is connected with the input end of the second analog-to-digital converter.
Further, the first communication circuit and the second communication circuit each comprise a network chip, a network transformer and a connector, and an output of the network chip is connected with the connector through the network transformer;
the input end of the network chip in the first communication circuit is connected with the scheduling master station, and the output end of the connector is connected with the voltage control module;
the input end of the network chip in the second communication circuit is connected with the voltage control module, and the output end of the connector is connected with the dynamic reactive power compensation device, the photovoltaic inverter or the fan.
Furthermore, the output end of the voltage control module is also connected with an interaction module.
Further, the models of the first analog-to-digital converter and the second analog-to-digital converter are AD7606 BSTZ.
The utility model has the advantages that:
(1) the acquisition circuit acquires new energy power station grid-connected points in a hard-wired mode, acquires voltage and current signals and outputs the voltage and current signals to the measurement circuit, the measurement circuit converts the voltage and reactive power of the power station grid-connected points according to the voltage and current signals output by the acquisition circuit to output voltage and reactive power data to the voltage control module, the first communication circuit sends the voltage and reactive power instructions issued by the power grid dispatching master station to the voltage control module, the voltage control module obtains single-machine reactive power regulation instructions according to the voltage and reactive power data sent by the measurement circuit and the voltage and reactive power instructions sent by the first communication circuit, and sends the instructions to each dynamic reactive power compensation device, inverter or fan, so that the new energy power station can participate in power grid voltage regulation.
(2) A protection diode is arranged in a rear-stage circuit of the acquisition circuit, when interference exists in the front-stage input of the voltage/current transformer and the rear-stage output of the voltage/current transformer is higher than the conduction voltage of the protection diode, the voltage higher than the conduction voltage at the rear stage can be directly conducted to the cathode and cannot be input to the first analog-to-digital converter; the combination of the first capacitor and the second capacitor can effectively remove high-frequency interference in the input of the front stage; the inductance value of the common mode inductor is small, the impedance is small when the common mode inductor works normally, the input waveform of a front stage is not influenced, and when high-frequency interference exists in the front stage, the impedance is large, so that the high-frequency interference cannot be input into the measuring circuit, and the surge fast transient interference can be effectively prevented.
(3) The network chip in the communication circuit is connected with the connector through the network transformer, the network transformer uses differential mode coupled coil coupling filtering of differential signals input at the front stage to enhance the signals, and the differential mode coupled coil coupling filtering is coupled to the connector through conversion of an electromagnetic field, so that the network chip is not physically connected with the connector, direct signal transmission between the network chip and the connector is separated, and the protection purpose is achieved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a block diagram of a voltage control apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of an acquisition circuit in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of a measurement circuit in accordance with an embodiment of the present invention;
fig. 4 is a block diagram of a communication circuit in an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment discloses a voltage control apparatus, which includes an acquisition circuit 10, a measurement circuit 20, a first communication circuit 30, a second communication circuit 40, and a voltage control module 50;
the input end of the acquisition circuit 10 is connected to a new energy power station grid-connected point in a hard-wired mode, the output end of the acquisition circuit is connected with the voltage control module 50 through the measurement circuit 20, the input end of the first communication circuit 30 is connected with the dispatching master station 60, the output end of the first communication circuit is connected with the voltage control module 50, and the output end of the voltage control module 50 is connected with the dynamic reactive power compensation device, the photovoltaic inverter or the fan through the second communication circuit 40 for communication.
The acquisition circuit 10 acquires a new energy power station grid-connected point in a hard-wired mode, acquires voltage and current signals and outputs the voltage and current signals to the measurement circuit 20, the measurement circuit 20 converts the voltage and the reactive power of the power station grid-connected point according to the voltage and current signals output by the acquisition circuit 10 to output voltage and reactive power data to the voltage control module 50, the first communication circuit 30 sends the voltage and reactive power instructions sent by the power grid dispatching master station 60 to the voltage control module 50, and the voltage control module 50 obtains a single-machine reactive power regulation instruction according to the voltage and reactive power data sent by the measurement circuit 20 and the voltage and reactive power instructions sent by the first communication circuit 30 and sends the instruction to each dynamic reactive power compensation device, inverter or fan, so that the new energy power station participates in power grid voltage regulation.
It should be noted that the voltage control module 50 is used for calculating the reactive power output of the reactive equipment of the new energy power station according to the voltage and the reactive power data of the grid-connected point output by the measurement module and the voltage or the reactive target value issued by the dispatching master station 60, generating a single-machine reactive power regulation instruction and issuing the single-machine reactive power regulation instruction to the second communication circuit 40, and the second communication circuit 40 receives the single-machine reactive power regulation instruction and issues the single-machine reactive power regulation instruction to each dynamic reactive power compensation device, the inverter or the fan. And the dynamic reactive power compensation device, the inverter or the fan completes a voltage control process after executing the reactive power instruction.
Specifically, the specific control strategy of the voltage control module 50 may be implemented by using a scheme of a voltage control method of the new energy delivery system as disclosed in patent application No. 201910766663.7.
In some embodiments, as shown in fig. 2, the acquisition circuit 10 includes a voltage/current transformer T1 and a first analog-to-digital converter AD, an output terminal of the voltage/current transformer T1 is connected in parallel with a protection diode D1, a first capacitor C3 and a second capacitor C4 are connected in parallel with two ends of the protection diode D1, the second capacitor C4 is connected with an input of the first analog-to-digital converter AD via a common-mode inductor L1, and an output of the first analog-to-digital converter AD is connected with the measurement circuit 20.
Specifically, a voltage/current transformer T1 converts grid-connected voltage and current of a new energy power station into a positive sine wave of 0-3.53V, the output of the voltage/current transformer T1 is used as the input of a post-stage circuit, a protection diode D1 in the post-stage circuit is a TVS (transient voltage suppressor) of P6KE6.8CA, and the conducting voltage is 6.8V. When interference exists in the front-stage input of the voltage/current transformer T1 and the rear-stage output of the voltage/current transformer T1 is higher than 6.8V, the voltage higher than 6.8V at the rear stage can be directly conducted to the cathode and cannot be input to the AD sampling circuit; the first capacitor C3 is a monolithic capacitor with the capacitance of 100pF, the second capacitor C4 is a correction capacitor with the capacitance of 4.7nF, and the combination of the first capacitor C3 and the second capacitor C4 can effectively remove high-frequency interference in the front-stage input; the inductance value of the common mode inductor L1 is 20uH, the inductance value is small, the frequency is 50Hz during normal work, the impedance is small, the front-stage input waveform is not influenced, when high-frequency interference exists in the front stage, the impedance is large, the high-frequency interference cannot be input into the measuring circuit 20, and the surge fast transient test can be effectively prevented.
In some embodiments, as shown in fig. 3, the measurement circuit 20 includes a filter circuit and a second analog-to-digital converter, an input of the filter circuit is connected to an output of the first analog-to-digital converter, and an output of the filter circuit is connected to an input of the second analog-to-digital converter.
Specifically, the filter circuit is an RC filter circuit composed of a resistor RR7, a resistor RR8 and a capacitor CC4, and is input into the second analog-to-digital converter U15, the capacitor C72 and the capacitor C75 are connected in parallel and then connected to the REGCAP-39 pin of the second analog-to-digital converter U15, the capacitor C76 and the capacitor C77 are connected in parallel and then connected to the REGCAP-36 pin of the second analog-to-digital converter U15, the gan pin of the second analog-to-digital converter U15 is grounded through a resistor R27, the PAR/SER _ SEL pin is grounded through a resistor R30, the AVCC pin is grounded through a capacitor C56, a capacitor C61, a capacitor C52 and a capacitor C60, the VDRIVE pin is grounded through a capacitor C68, and the OS0, OS1, REF 2, STBY and the cell _ SEL pin is grounded through resistors R37, R36, R35, R45 and R44, respectively.
It should be noted that the chip models of the first analog-to-digital converter and the second analog-to-digital converter both adopt AD7606 BSTZ.
The measurement circuit outputs a signal to a measurement program in the CPU program, and calculates the voltage and power from the voltage and current fundamental wave signals output from the measurement circuit.
It should be noted that both the fourier voltage algorithm and the power calculation algorithm are implemented by the prior art, and the algorithms refer to shima-fourier microcomputer protection algorithm research [ J ] science and technology prospect, 2017(9).
It should be noted that, in this embodiment, the calculation process may be processed in 2 ms interruption, and the reactive power of the new energy power station is obtained according to the complex value of the voltage and the current; the voltage of the new energy power station is calculated by adopting a full-wave Fourier algorithm, so that the original sampling signal output by the acquisition module can be extracted into a voltage fundamental component within 20 milliseconds, the integral harmonic component can be filtered, and the stability is good.
In some embodiments, as shown in fig. 4, the first communication circuit 30 and the second communication circuit 40 each include a network chip U40, a network transformer U42, and a connector U44, the output of the network chip U40 being connected to the connector U44 via the network transformer U42;
wherein, the input terminal of the network chip U40 in the first communication circuit 30 is connected to the scheduling master station 60, and the output terminal of the connector U44 is connected to the voltage control module 50;
the input end of the network chip U40 in the second communication circuit 40 is connected with the voltage control module 50, and the output end of the connector U44 is connected with the dynamic reactive power compensation device, the photovoltaic inverter or the fan.
It should be noted that the communication circuit is composed of a hardware network chip and a communication software package, when the communication is performed, the voltage or reactive instruction of the grid-connected point of the master station is issued in the form of a message, the analog quantity of the ethernet TCP message is converted into a digital quantity by the network chip, and the instruction issued by the master station is analyzed by the software package. During the downward communication, the single-machine reactive power regulation instruction of the automatic voltage control module 50 is received, and is sent to the side of the hardware network chip after being packaged by the software package, and the hardware network chip sends an ethernet message to the dynamic reactive power compensation device, the inverter or the fan.
In the communication circuit, the network chip U40 adopts a 100M self-contained PHY transceiver network chip LXT971ALE, the network chip U40 is connected to an RJ45 connector through a network transformer U42, and the network transformer U42 filters differential signals input at the front stage by using differential mode coupled coil coupling to enhance the signals and couples the signals to an RJ45 by electromagnetic field conversion. The network interface chip is not physically connected with the RJ45 connector, and direct signal transmission between the network interface chip and the RJ45 connector is cut off, so that the protection purpose is achieved.
In some embodiments, an interaction module 70 is further connected to the output of the voltage control module 50.
It should be noted that the human-computer interface interaction module is implemented by the device liquid crystal and the monitoring background, so that a user can monitor the operation state and data of the device conveniently, and the user can issue the voltage control operation fixed value through the human-computer interface interaction module and then output the parameter to the automatic voltage control module 50.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A voltage control apparatus, characterized in that the apparatus comprises: the device comprises an acquisition circuit, a measurement circuit, a first communication circuit, a second communication circuit and a voltage control module;
the input end of the acquisition circuit is connected to a new energy power station grid-connected point in a hard wiring mode, the output end of the acquisition circuit is connected to the voltage control module through the measurement circuit, the input end of the first communication circuit is connected to the dispatching master station, the output end of the first communication circuit is connected to the voltage control module, and the output end of the voltage control module is connected to the dynamic reactive power compensation device, the photovoltaic inverter or the fan through the second communication circuit for communication.
2. The voltage control device of claim 1, wherein the acquisition circuit comprises a voltage/current transformer and a first analog-to-digital converter, an output terminal of the voltage/current transformer is connected in parallel with a protection diode, a first capacitor and a second capacitor are connected in parallel with two ends of the protection diode, the second capacitor is connected with an input of the first analog-to-digital converter through a common mode inductor, and an output of the first analog-to-digital converter is connected with the measurement circuit.
3. The voltage control device of claim 2, wherein the measurement circuit comprises a filter circuit and a second analog-to-digital converter, an input of the filter circuit being connected to an output of the first analog-to-digital converter, an output of the filter circuit being connected to an input of the second analog-to-digital converter.
4. The voltage control apparatus of claim 2, wherein the first communication circuit and the second communication circuit each comprise a network chip, a network transformer, and a connector, an output of the network chip being connected to the connector via the network transformer;
the input end of the network chip in the first communication circuit is connected with the scheduling master station, and the output end of the connector is connected with the voltage control module;
the input end of the network chip in the second communication circuit is connected with the voltage control module, and the output end of the connector is connected with the dynamic reactive power compensation device, the photovoltaic inverter or the fan.
5. The voltage control apparatus of claim 1, wherein the output terminal of the voltage control module is further connected to an interaction module.
6. The voltage control device of claim 3, wherein the first analog-to-digital converter and the second analog-to-digital converter are both of the type AD7606 BSTZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123255841.1U CN216720928U (en) | 2021-12-22 | 2021-12-22 | Voltage control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123255841.1U CN216720928U (en) | 2021-12-22 | 2021-12-22 | Voltage control device |
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| CN216720928U true CN216720928U (en) | 2022-06-10 |
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| CN202123255841.1U Active CN216720928U (en) | 2021-12-22 | 2021-12-22 | Voltage control device |
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