CN209844563U - A dynamic power quality regulator for microgrid - Google Patents

Abstract

The utility model relates to the technical field of micro-grid power quality adjustment, and proposes a power quality dynamic regulator for the micro-grid, which is connected to the micro-grid, distribution network and load respectively. The micro-grid includes a photovoltaic power generation system, a wind power generation system, The energy storage system includes: a power quality monitoring module, a power monitoring module, a power quality dynamic controller, and an inverter; the power quality monitoring module is used to detect the power quality of the distribution network and the load; the power monitoring module is used to detect The active power and reactive power output by the microgrid. When the microgrid produces power quality problems, the utility model adopts the power quality dynamic controller to integrate the power balance between the power supply side and the power consumption side in the microgrid, the control situation of the inverter, and the operation status of the energy storage system to obtain the electric energy The quality dynamic adjustment command adjusts the control strategy of each distributed power supply, so as to achieve power balance and optimal power quality in the microgrid.

Description

A dynamic power quality regulator for microgrid

technical field

The utility model relates to the technical field of micro-grid power quality regulation, in particular to a power quality dynamic regulator for the micro-grid.

Background technique

Microgrid, also known as microgrid, refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, including DC microgrids, AC microgrids, and AC-DC hybrid power grids. Microgrid, etc. At present, the AC microgrid is still the main form of the microgrid, and the DC microgrid can be connected to the AC microgrid through the inverter.

The microgrid is generally at the end of the distribution network, and can be composed of distributed power sources such as photovoltaic power generation systems and wind power generation systems to form a power supply network that can be connected to the grid or run independently off the grid. During the operation of the microgrid, its power quality such as voltage, frequency, and harmonics may be affected by the power supply side, such as fluctuations in the grid voltage; it may also be affected by the user side, such as various non- Linear load and three-phase unbalanced load, etc. At the same time, the output power of new energy power generation systems such as photovoltaic power generation systems in microgrids will be affected by climate and other factors, showing volatility and intermittency. The power fluctuation of the microgrid may cause the power imbalance between the power supply side and the power consumption side in the microgrid, especially in the island microgrid, including the imbalance of active power and reactive power, and the imbalance of power will cause microgrid Grid voltage and frequency fluctuations.

In summary, the power quality in the microgrid may be affected by the power supply side and the user side, and may be affected by the environmental factors of the distributed power supply of the microgrid itself. Therefore, the power quality problem in the microgrid is more complicated, and with the The running status changes in real time. It is difficult to achieve the optimal control effect by using a single inverter control, and the centralized monitoring and control by the micro-grid central controller will make the system more complicated and the security will be reduced.

Utility model content

The purpose of the utility model is to improve the existing deficiencies in the prior art, and provide a power quality dynamic regulator for a microgrid, so that the power supply side and the power consumption side of the microgrid can achieve power balance and optimal power quality.

In order to achieve the purpose of the above-mentioned utility model, the embodiment of the utility model provides the following technical solutions:

A power quality dynamic regulator for a microgrid, which is connected to the microgrid, distribution network, and loads respectively, and the microgrid, distribution network, and loads are all connected to the AC bus of the microgrid. The microgrid includes photovoltaic power generation systems, wind power Power generation system, energy storage system, including:

The power quality monitoring module is used to detect the power quality of distribution network and load;

The power monitoring module is used to detect the active power and reactive power output by the microgrid;

A power quality dynamic controller connected to the power quality monitoring module and the power monitoring module respectively, for adjusting the output voltage and power of the microgrid;

The photovoltaic power generation system, the wind power generation system, and the energy storage system are respectively connected to inverters, and the inverters are all connected to the dynamic power quality controller.

Furthermore, in order to better realize the utility model, it also includes a peripheral auxiliary module, and the peripheral auxiliary module includes:

A power supply circuit connected to the power quality monitoring module, the power monitoring module, and the power quality dynamic controller respectively;

The communication bus that connects the microgrid, distribution network, load, inverter, power quality monitoring module, power monitoring module, and power quality dynamic controller to communicate.

Furthermore, in order to better realize the utility model, the power quality monitoring module includes:

The first voltage sensor and the first current sensor installed at the public coupling point of the distribution network and the microgrid;

The second voltage sensor and the second current sensor installed at the connection point where the load is merged into the AC busbar of the microgrid;

The first voltage sensor, the first current sensor, the second voltage sensor, and the second current sensor are all connected to the power quality dynamic controller through a communication bus.

Furthermore, in order to better realize the utility model, the power monitoring module includes:

A third voltage sensor and a third current sensor installed at the output port of the photovoltaic power generation system;

The fourth voltage sensor and the fourth current sensor installed at the output port of the wind power generation system;

The fifth voltage sensor and the fifth current sensor installed at the output port of the energy storage system;

The third voltage sensor, the third current sensor, the fourth voltage sensor, the fourth current sensor, the fifth voltage sensor, and the fifth current sensor are all connected to the power quality dynamic controller through a communication bus.

Furthermore, in order to better realize the utility model, the dynamic controller of power quality includes a microcontroller connected to the inverter and its peripheral circuits, and the peripheral circuits include a reset circuit, a clock circuit, and a memory.

Furthermore, in order to better realize the utility model, the communication bus is RS485.

Furthermore, in order to better realize the utility model, it also includes a micro-grid central controller connected to the power quality dynamic control platform through the communication bus.

Furthermore, in order to better realize the utility model, it also includes a touch screen connected with the power quality dynamic controller.

Compared with the prior art, the utility model has the beneficial effects:

The utility model adopts the two-way communication between the power quality dynamic controller and each distributed power source in the microgrid. When the microgrid generates power quality problems, the power quality dynamic controller integrates the power balance between the power supply side and the power consumption side in the microgrid, According to the control status of distributed power inverters and the running status of energy storage system, the dynamic adjustment command of power quality can be obtained, and the control strategy of each distributed power supply and energy storage system can be adjusted, so as to achieve the power balance and the best power quality in the microgrid. excellent. The power quality dynamic controller is located between the microgrid inverter and the microgrid central control system. The power quality dynamic controller communicates with the inverters and loads in the microgrid. The control system is one-way communication, which not only realizes the dynamic adjustment of power quality, but also ensures the reliability and safety of the microgrid operation. Moreover, the device of the utility model is simple, reliable, and low in cost, and can be used in conjunction with the existing micro-grid central control system, and is suitable for various occasions of power quality adjustment in the micro-grid.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a block diagram of the module structure of the utility model power quality dynamic regulator.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present utility model, the terms "first", "second" and so on are only used to distinguish the description, and cannot be understood as indicating or implying relative importance, or implying that there is any such difference between these entities or operations. Actual relationship or sequence.

Example 1:

The utility model is realized through the following technical scheme. As shown in Figure 1, a power quality dynamic regulator for a microgrid is connected to the microgrid, distribution network and load respectively, and the microgrid, distribution network and load are all connected into the AC bus of the microgrid, the microgrid includes a photovoltaic power generation system, a wind power generation system, and an energy storage system, including a power quality monitoring module, a power monitoring module, a power quality dynamic controller, and multiple inverters, and the power quality monitoring The module and the power monitoring module are respectively connected to the dynamic power quality controller. The photovoltaic power generation system, the wind power generation system and the energy storage system are respectively connected to one of the inverters, and these inverters are all connected to the dynamic power quality controller. Wherein, the power quality monitoring module is used to detect the power quality of the distribution network and load; the power monitoring module is used to detect the active power and reactive power output by the microgrid; the power quality dynamic controller is used to receive power quality monitoring The power quality of the distribution network and load detected by the module, and the power quality of the microgrid detected by the power monitoring module and the output active power and reactive power, including the charge and discharge information of the energy storage system, and the power quality and power of the microgrid Calculate and analyze the situation, generate corresponding command signals, and control the inverters connected to the microgrid to adjust the output voltage and power of the microgrid, thereby coordinating the coordinated work of distributed power sources and loads.

The power quality dynamic regulator also includes a power supply circuit for the power quality monitoring module, power monitoring module, and power quality dynamic controller, and is used for microgrid, distribution network, load, inverter, power quality monitoring module, power The monitoring module and the power quality dynamic controller are connected to a communication bus for communication.

It should be noted that in this embodiment, the photovoltaic power generation system, the wind power generation system, and the energy storage power generation system constitute the distributed power supply on the power supply side, and the load is on the power consumption side. Distributed power supply refers to small and medium-sized power supply systems distributed around the power consumption side in the microgrid, but is not limited to photovoltaic power generation systems, wind power generation systems, and energy storage systems.

Furthermore, the power quality monitoring module includes a first voltage sensor, a first current sensor, a second voltage sensor, and a second current sensor, and the first voltage sensor and the first current sensor are installed on the distribution network and the microgrid. At the public coupling point, it is used to detect the power quality at the place where the microgrid is connected to the distribution network; the second voltage sensor and the second current sensor are installed at the connection point where the load is merged into the AC bus of the microgrid, and are used to detect that the load is connected to the microgrid and the first voltage sensor, the first current sensor, the second voltage sensor, and the second current sensor are all connected to the power quality dynamic controller through the communication bus, and upload the detected power quality to the power quality dynamic controller in real time information.

The power monitoring module includes a third voltage sensor, a third current sensor, four voltage sensors, a fourth current sensor, a fifth voltage sensor, and a fifth current sensor; the third voltage sensor and the third current sensor are installed in photovoltaic power generation system output port; the four voltage sensors and the fourth current sensor are installed at the output port of the wind power generation system; the fifth voltage sensor and the fifth current sensor are installed at the output port of the energy storage system; and the third voltage sensor, the third current sensor The sensor, the fourth voltage sensor, the fourth current sensor, the fifth voltage sensor and the fifth current sensor are all connected to the power quality dynamic controller through the communication bus.

The first to fifth voltage sensors, the first to fifth current sensors are all Hall sensors.

It should be noted that the distribution network, also known as the distribution network, refers to a power system that is close to the power consumption side and distributes electric energy to the power consumption side. Generally, the voltage level is relatively low. Usually, the microgrid of low voltage level is connected to the power consumption side, so the microgrid is connected to a certain node of the distribution network. The point where the microgrid is connected to the distribution network is called the public coupling point, and an AC The switch, in other words, the location of the AC switch is the common coupling point. When the AC switch is closed, the microgrid and the distribution network supply power to the load together. This mode of operation is called grid-connected operation mode. In this mode, the voltage of the AC bus of the microgrid is clamped by the voltage of the distribution network. , that is, the distribution network voltage determines the voltage of the AC busbar of the microgrid; if a fault occurs in the distribution network, the AC switch will be disconnected, and the photovoltaic power generation system, wind power generation system, and energy storage system in the microgrid jointly supply power to the load. This mode of operation is called off-grid operation mode. In this mode, the voltage of the AC bus of the microgrid is controlled by the inverter connected to the energy storage system. By controlling the power generated by the energy storage system, the AC of the microgrid is balanced The power of the busbar, so as to balance the power between the power supply side and the power consumption side.

The power quality is used to measure the quality index of electric energy provided by the power grid (including distribution network, micro-grid, etc.) when supplying power to loads, and the index includes three-phase voltage unbalance, voltage deviation, frequency deviation, and harmonics.

The three-phase voltage balance means that the three-phase AC voltage in the power grid is a standard three-phase sine wave when it is balanced, with a phase difference of 120° and the same amplitude. If the above conditions are not met, it is called a three-phase voltage imbalance. When the three-phase voltage is unbalanced, the three-phase voltage can be decomposed into positive-sequence component, negative-sequence component, and zero-sequence component. When the three-phase voltage is balanced, the three-phase voltage will not be decomposed into negative-sequence component and zero-sequence component. Therefore, when detecting power quality, it is possible to judge whether the three-phase voltage is balanced by detecting whether there is a negative sequence component in the three-phase voltage.

Voltage deviation and frequency deviation refer to the magnitude of the voltage amplitude and frequency provided by the power grid to deviate from the rated value of the voltage amplitude and the rated value of the frequency. For example, the voltage amplitude rating of the three-phase voltage of 380V is The frequency is nominally 50Hz.

Harmonic means that the voltage and current in the power grid should be a standard sinusoidal waveform if they are normal. If under the influence of some factors, such as the influence of the load or the inverter in the microgrid, it may cause the sinusoidal waveform of the voltage or current. The waveform is distorted, and the Fourier series is used for calculation and decomposition. The distorted sine wave can be decomposed into components of multiple frequencies. For example, a 50Hz distorted sine wave can be superimposed into a 50Hz standard sine wave and a 150Hz standard The sine wave is superimposed with a 250Hz standard sine wave, etc. When such a group of standard sine waves are superimposed, the 50Hz standard sine wave is called the fundamental wave, and the sine waves of other frequencies are called harmonics.

In this embodiment, the power quality of the microgrid AC busbar is affected by many aspects, including distribution network, photovoltaic power generation system, wind power generation system, energy storage system, and load, that is, distribution network side, distributed power supply side, power consumption side effects, and there are also interactions between them.

Furthermore, on the one hand, if the inverter connected to the energy storage system is improperly controlled, power quality problems may occur; on the other hand, when the microgrid is running off-grid, photovoltaic power generation systems, wind power generation systems The generated power is easy to change and fluctuate, which will lead to fluctuations in the power consumption on the power consumption side. When the power on the power supply side and the power consumption side is unbalanced, the voltage amplitude and frequency of the AC bus of the microgrid will also fluctuate. and deviation.

Therefore, this embodiment uses the power quality monitoring module to monitor the power quality at the public coupling point between the microgrid and the distribution network, and where the load is connected to the AC bus of the microgrid, and uploads it to the power quality dynamic controller through the communication bus to monitor the power quality. Do analysis and evaluation; use the power monitoring module to monitor the active power and reactive power of the output ports of photovoltaic power generation systems, wind power generation systems, and energy storage systems, and upload them to the power quality dynamic controller through the communication bus for further calculation. When it is unbalanced, adjust it to avoid affecting the power consumption experience on the power consumption side.

The power quality dynamic controller collects data from the signal transmitted by the communication bus, and calculates and analyzes the data. According to the calculation and analysis results of power quality and power data, a specific control strategy is obtained and sent to the corresponding photovoltaic system in the microgrid. The inverter connected to the power generation system, the inverter connected to the wind power generation system, and the inverter connected to the energy storage system can dynamically adjust the power quality of the microgrid by adjusting the parameters of the inverter to improve the power quality; or Adjust the power generation of distributed power sources in the microgrid and the power consumption of loads to achieve power balance between the power supply side and the power consumption side.

It should be noted that the parameters of the inverter include parameters such as a power threshold and a power quality index of the distributed power source corresponding to the inverter. The photovoltaic power generation system sends out direct current, which is converted into alternating current and enters the AC busbar of the microgrid after being matched and connected with the inverter. The wind power generation system converts the AC power generated by the wind turbine into DC power after rectification, and then converts it into AC power through the matching inverter and enters the AC bus of the microgrid. The battery in the energy storage system needs to be charged and discharged. When charging, the external AC power needs to be rectified and converted into DC. When discharging, the DC power generated by the battery needs to be reversed into AC power. Therefore, the inverter matched with the energy storage system is a bidirectional converter. device. When adjusting the parameters of the inverter, you can set the output current or output power command of the inverter, so as to adjust the current and power output by the distributed power supply, that is, adjust the power generation of the distributed power supply.

Furthermore, the power quality dynamic controller includes a microcontroller connected to the inverter and its peripheral circuits, and the peripheral circuits include a reset circuit, a clock circuit, a memory, and multiple comparator circuits. The comparator circuit is composed of an integrated operational amplifier, which is respectively connected with the micro-controller, and is used for logical operation and sorting of the detected current and voltage signals, and then uploaded to the power quality dynamic controller. The power quality dynamic controller is connected with a touch screen, and the touch screen is used to realize the output of each parameter and the display of the running status of the power quality dynamic regulator.

The power quality dynamic controller is connected with a microgrid central control system, and the microgrid central control system refers to a system installed in the microgrid to monitor and control the operating state of the microgrid. It is generally composed of a host computer and corresponding systems. Its monitoring of the microgrid is generally the generation of photovoltaic power generation systems, the power generation of wind power generation systems, the status of energy storage systems, the connection status with distribution networks, and the power consumption of loads. Wait. In the event of unbalance or power quality problems, the central control system of the microgrid can directly choose to cut off a certain power supply side in the distributed power supply, or directly unload the excess power. Without changing the settings of the original micro-grid central control system, the utility model can be used to realize the adjustment of power quality and power, and make up for the defect that the micro-grid central control system cannot be adjusted independently. The microgrid central control system was upgraded. More importantly, the communication connection direction of the utility model through the power quality dynamic controller and the microgrid central control system is unidirectional, that is, only the power quality dynamic controller is allowed to send information to the microgrid central control system, and the microgrid central control system is not allowed. The network central control system sends information to the power quality dynamic controller, which can ensure the safety of the entire power quality dynamic regulator.

It should be noted that since the upper computer of the microgrid central control system is generally connected to the outside world for data transmission, if the microgrid central control When the central control system of the microgrid is controlled by viruses, it may lead to the paralysis of the microgrid power supply and power consumption system. Therefore, the separate power quality dynamic regulator proposed by the utility model is used to carry out detailed control on the power supply side and the power consumption side in the microgrid. The regulator does not need to be connected to the Internet, and the microgrid central control system only uploads the regulator The security of the microgrid can be improved by consulting the data of the microgrid without controlling it.

In summary, the utility model adopts two-way communication between the power quality dynamic controller and each distributed power source in the microgrid. According to the power balance of the distributed power supply, the control situation of the distributed power inverter, and the operating status of the energy storage system, the dynamic adjustment command of the power quality is obtained, and the control strategy of each distributed power supply and energy storage system is adjusted, so that the power in the microgrid can reach Optimal balance and power quality. The power quality dynamic controller is located between the microgrid inverter and the microgrid central control system. The power quality dynamic controller communicates with the inverters and loads in the microgrid. The control system is one-way communication, which not only realizes the dynamic adjustment of power quality, but also ensures the reliability and safety of the regulator. Moreover, the device of the utility model is simple, reliable, and low in cost, and can be used in conjunction with the existing micro-grid central control system, and is suitable for various occasions of power quality adjustment in the micro-grid.

Example 2:

This implementation column is further optimized on the basis of the above-mentioned implementation column 1. As shown in Figure 1, the power quality dynamic controller monitors the power generation power of each distributed power source in the microgrid and the power consumption of the load in real time. When the generating power of the power source is higher than the power consumption of the load, the power quality dynamic controller judges the discharge depth of the energy storage system through the voltage and current signals of the energy storage system. When the discharge depth of the energy storage system is higher than the preset first threshold, the power quality dynamic controller issues an instruction to charge the energy storage system, and controls the energy storage system to be in the charging state at this time; if the energy storage system is fully charged, or the discharge depth of the energy storage system is lower than the first The state of the temperature-regulating load in the grid, when the temperature-regulating load can work, control the operation of the temperature-regulating load to absorb the excess power generated by the distributed power; The excess energy is incorporated into the distribution network, or part of the distributed power is cut off.

When the power generated by the distributed power source is lower than the power consumption of the load, and the microgrid is in the off-grid operation mode, the power quality dynamic controller microgrid will issue a discharge command and a power reference value to control the energy storage system to cooperate with the microgrid for complementary operation. Maintain power to the load.

Through the above control, the power of the power supply side and the power consumption side of the microgrid can be stabilized in a balanced state, and the voltage and frequency of the microgrid will not fluctuate greatly. That is, through the power balance control of distributed power sources and loads, the initial realization Adjustment of power quality.

It should be noted that the depth of discharge of the energy storage system refers to the release degree of the stored electricity of the battery in the energy storage system, and the depth of discharge is related to the life of the battery. Therefore, the depth of discharge of the battery should be monitored and controlled. When detecting the depth of discharge, the state of charge of the battery is usually detected, or the terminal voltage of the battery is monitored, and the terminal voltage has a positive linear relationship with the depth of discharge. The preset first threshold value of the depth of discharge is the value at which the storage battery is insufficient and needs to be charged, which is equivalent to the terminal voltage value of the battery.

When the microgrid is running, the public coupling point and load of the power quality dynamic controller microgrid and the distribution network are incorporated into the voltage and current signals at the AC bus of the microgrid for data collection, calculation and analysis, and a comprehensive evaluation of the power quality of the microgrid can be obtained result. When the microgrid power quality evaluation result exceeds the power quality index, first evaluate the active power balance and reactive power balance status of the power supply side and the power consumption side in the microgrid, and judge whether the distributed power generation power is higher or higher. The power consumption is lower than the load, and then use the above method to control the power balance. At the same time, the power quality dynamic controller generates control strategies for each inverter according to the severity of each index in the microgrid power quality.

For example, when the microgrid is in the off-grid operation mode and the three-phase voltage imbalance of the AC bus of the microgrid is serious, the power quality dynamic controller sends instructions and the negative sequence voltage reference value to the microgrid for voltage stability control. Inverter, so that the inverter adjusts the control structure and increases the negative sequence voltage control link, that is, through the control of the negative sequence voltage, the three-phase voltage balance of the AC bus of the microgrid is maintained. Similarly, when the voltage amplitude or frequency of the AC bus of the microgrid in the off-grid operation mode deviates from the rated value, the power quality dynamic controller issues a control command to make the inverter adjust the control strategy, so that the AC bus of the microgrid Voltage and frequency are maintained at rated values.

When the microgrid is in the grid-connected operation mode, and the three-phase voltage of the AC bus of the microgrid is unbalanced due to the integration of a large number of unbalanced three-phase voltage loads inside the microgrid, the power quality dynamic controller monitors the load current. The negative-sequence component of the negative-sequence current and the value to be compensated for the negative-sequence current, according to the capacity ratio of each distributed power source and energy storage system in the microgrid, the negative-sequence current to be compensated value is distributed to each distributed power source and energy storage system, that is Control each distributed power supply and energy storage system to send negative sequence compensation current, so that the AC bus of the microgrid can restore the three-phase voltage balance.

When the microgrid is ready to switch from the off-grid operation mode to the grid-connected operation mode, in order to ensure the power quality at the moment of the microgrid state switching, the power quality dynamic controller detects the voltage amplitude and phase information of the power supply side, and uses it as a The reference value is sent to the inverter in the microgrid, and the voltage at the output port of the inverter is controlled to adjust gradually, depending on the AC bus voltage of the microgrid gradually approaching the voltage of the distribution network. When the voltage of the microgrid is completely synchronized with the voltage of the distribution network, the electric energy The quality dynamic controller sends a closing instruction signal to the AC switch at the public coupling point of the microgrid and the distribution network, so that the AC switch is closed, so that the microgrid is successfully switched from the off-grid operation mode to the grid-connected operation mode, avoiding the instantaneous The impact of voltage and current improves the power quality of the AC bus of the microgrid.

When the power quality dynamic controller dynamically adjusts the power quality of the microgrid, the monitored data and operation instructions are also uploaded to the central control system of the microgrid through the communication bus, but at this time the communication is one-way communication, which ensures the adjustment The reliability and security of the device reduce the complexity of the system.

Other parts of this embodiment are the same as those of the above embodiments, so they will not be repeated here.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (8)

1. A power quality dynamic regulator for a microgrid, connected to the microgrid, distribution network, and load respectively, and the microgrid, distribution network, and load are all connected to the microgrid AC bus, and the microgrid includes a photovoltaic power generation system , wind power generation system, energy storage system, characterized in that: comprising: The power quality monitoring module is used to detect the power quality of distribution network and load; The power monitoring module is used to detect the active power and reactive power output by the microgrid; A power quality dynamic controller connected to the power quality monitoring module and the power monitoring module respectively, for adjusting the output voltage and power of the microgrid; The photovoltaic power generation system, the wind power generation system, and the energy storage system are respectively connected to inverters, and the inverters are all connected to the dynamic power quality controller. 2. A kind of power quality dynamic regulator for microgrid according to claim 1, characterized in that: it also includes a peripheral auxiliary module, and the peripheral auxiliary module includes: A power supply circuit connected to the power quality monitoring module, the power monitoring module, and the power quality dynamic controller respectively; The communication bus that connects the microgrid, distribution network, load, inverter, power quality monitoring module, power monitoring module, and power quality dynamic controller to communicate. 3. A kind of power quality dynamic regulator for microgrid according to claim 2, characterized in that: the power quality monitoring module includes: The first voltage sensor and the first current sensor installed at the public coupling point of the distribution network and the microgrid; The second voltage sensor and the second current sensor installed at the connection point where the load is merged into the AC busbar of the microgrid; The first voltage sensor, the first current sensor, the second voltage sensor, and the second current sensor are all connected to the power quality dynamic controller through a communication bus. 4. A kind of power quality dynamic regulator for microgrid according to claim 2, characterized in that: said power monitoring module comprises: A third voltage sensor and a third current sensor installed at the output port of the photovoltaic power generation system; The fourth voltage sensor and the fourth current sensor installed at the output port of the wind power generation system; The fifth voltage sensor and the fifth current sensor installed at the output port of the energy storage system; The third voltage sensor, the third current sensor, the fourth voltage sensor, the fourth current sensor, the fifth voltage sensor, and the fifth current sensor are all connected to the power quality dynamic controller through a communication bus. 5. A kind of power quality dynamic regulator for micro-grid according to claim 1, characterized in that: said power quality dynamic controller includes a microcontroller connected to an inverter and its peripheral circuits, said Peripheral circuits include reset circuits, clock circuits, and memory. 6. A power quality dynamic regulator for microgrid according to claim 2, characterized in that: said communication bus is RS485. 7. A power quality dynamic regulator for a microgrid according to claim 2, further comprising a microgrid central controller connected to the power quality dynamic control platform through a communication bus. 8. A power quality dynamic regulator for a microgrid according to any one of claims 1-7, characterized in that it further comprises a touch screen connected to the power quality dynamic controller.