CN103647345A - Micro source controller and method for realizing grid-connected and off-grid control - Google Patents
Micro source controller and method for realizing grid-connected and off-grid control Download PDFInfo
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- CN103647345A CN103647345A CN201310228130.6A CN201310228130A CN103647345A CN 103647345 A CN103647345 A CN 103647345A CN 201310228130 A CN201310228130 A CN 201310228130A CN 103647345 A CN103647345 A CN 103647345A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention provides a micro source controller and a method for realizing grid-connected and off-grid control. The micro source controller comprises a communication module and a measurement and control module. The measurement and control module comprises a measurement module and a control module. The communication module is connected with the control module and a microgrid central control unit. The measurement module is connected with the control module and the micro source output line in a microgrid system. The control module is used to determine the microgrid system is in which operating mode according to the actual condition of local device information and the control instruction of the microgrid central control unit so as to automatically realize the grid-connected/off-grid switching and local device control. The micro source controller and method of the invention can be used to provide real-time micro source, ensure the dynamic matching between the micro source and the user load power of the microgrid system in the off-grid operating mode, and improve the stability and reliability of the microgrid.
Description
Technical field
The invention belongs to micro-power supply and micro-power grid control technical field, be specifically related to micro-power-supply controller of electric and use micro-power-supply controller of electric realize micro-electrical network and public electric wire net also/from the method for network control system.
Background technology
Renewable energy power generation (as photovoltaic generation, wind power generation) is an important channel that obtains electric energy, and they distribute and are connected in parallel on traditional power line, to user, provide energy.But along with the distributed power source of One's name is legion accesses existing power distribution network, traditional radial passive power distribution network will produce the variation of essence, these variations will bring threat to the safe and reliable operation of power distribution network.In order to coordinate the contradiction between power distribution network and distributed power source, making full use of distributed power source is value and the benefit that electrical network and user bring, and at the beginning of 21 century, some experts and scholars have proposed the concept of micro power network, correspondingly the distributed power source in micro-electrical network is called to micro power, is called for short micro-source.
Micro-electrical network, by distributed power source, load, energy storage and various controller combination, forms a single controlled unit, simultaneously to user's supply of electrical energy and heat energy.It does not change existing distribution network structure, by the management of the distributed power generation power supply in net and load, eliminate the impact of distributed power source on traditional power distribution network, bring into play better the application potential of distributed power source, its correlation technique has obtained the attention of a lot of countries in the world.
It is exactly control problem that micro-electrical network needs one of key issue of solution in actual motion.The various complexity of micro-power supply in micro-electrical network, and there is stand-alone capability, it can realize the function of plug and play and seamless switching, and relatively large electrical network can be used as an autonomous system that can realize self-control and management, and this has just caused the control strategy of micro-electrical network more complicated.
At present, though some countries have carried out micro-electrical network research, only complete the fundamental research of micro-electrical network abroad, solved the Issues of Basic Theory of micro-operation of power networks, protection and economic analysis; Although the domestic research to micro-electrical network makes some progress, but the huge research team forming with Europe, the U.S. and Japanese Deng You research institution, manufacturer and Utilities Electric Co. compares, still there is with it larger gap in China in research effort and the achievement that obtains.In addition, both at home and abroad the research of micro-power-supply controller of electric in micro-electrical network was focused mostly in theoretical research and simulation analysis stage.
Summary of the invention
The deficiency existing for prior art, the invention provides a kind of micro-power-supply controller of electric and realize also/from the method for network control system, provide real-time micro-power supply to control, guarantee that micro-grid system, at the Dynamic Matching of micro-power supply and customer charge power under network operation pattern, improves stability and the reliability of micro-electrical network.
Micro-power-supply controller of electric provided by the present invention, comprises communication module and control module, and described control module comprises measurement module and control module; Described communication module is connected with described control module and micro-electrical network central controller, and described measurement module is connected with the micro-power supply output line road in described control module and micro-grid system;
Described measurement module, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that described control module can be processed, and converts voltage signal to digital quantity by analog quantity, and sends digital quantity to described control module;
Described control module for by obtain also/digital quantity after net on off state information and wherethrough reason sends described communication module to, and receives the control command that micro-electrical network central controller that described communication module transmits sends, and carries out this control command;
Described communication module by from described control module, receive also/from net on off state information and digital quantity, send micro-electrical network central controller to, and the control command that micro-electrical network central controller is sent sends described control module to.
Further, described measurement module comprises instrument transformer plate and the AD sampling module being connected with described instrument transformer plate; Described instrument transformer plate is connected with the micro-power supply output line road in micro-grid system, and described AD sampling module is connected with described control module; Described instrument transformer plate, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that described control module can be processed, and is sent to described AD sampling module; The voltage signal that described AD sampling module is used for receiving from described instrument transformer plate is converted to digital quantity by analog quantity, and sends this digital quantity to described control module.
Further, described control module adopts DSP to control processing module; DSP controls processing module received digital quantity is carried out to frequency measurement, calculates active power, reactive power and power angle, and also/from the double mode switching of net, meritorious/idle control and constant voltage/constant frequency, control;
When micro-grid system is from being incorporated into the power networks when switching from Running State, described DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, described DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
When micro-grid system is when switching from network operation to the state that is incorporated into the power networks, described DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency;
Described gain merit/idle control refers to, described DSP controls processing module using the given active power of the micro-electrical network central controller receiving, reactive power as input variable, by active power, reactive power decoupling zero, through pi regulator, provide reference value for Current Control component, current error signal is for inverter provides pulse-width signal under pi regulator effect, and control inverter is exported active power, the reactive power of appointment;
Described voltage/frequency is controlled and is referred to, described DSP controls processing module using the given voltage of the micro-electrical network central controller receiving, frequency as input variable, and control inverter output voltage, frequency are constant.
Further, before the control command that described DSP control processing module is sent at the micro-electrical network central controller of execution, the control command that described DSP control processing module is sent micro-electrical network central controller according to local actual conditions is carried out validity judgement, if this control command is not accepted by micro-power supply, do not carry out this control command.DSP controls processing module according to the local information gathering and the central controller controls instruction receiving, determine micro-grid system is under which kind of operational mode, automatically realize the relevant control to the switching of operational mode and local device, to guarantee local local voltage stabilization.
Further, described communication module is CAN bus communication module.Externally by CAN bus, connect, can effectively support distributed control or control in real time.
The present invention also provide a kind of use micro-power-supply controller of electric realize micro-electrical network and public electric wire net also/from the method for network control system, it is characterized in that, comprise the following steps:
(1) measurement module by micro-power-supply controller of electric detects the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that described control module can be processed, by analog quantity, convert voltage signal to digital quantity, and send digital quantity to described control module;
(2) control module of micro-power-supply controller of electric obtain also/from net on off state information, and will be also/from net on off state information and digital quantity, by communication module, send micro-electrical network central controller to;
(3) micro-electrical network central controller according to receive also/from net on off state information and digital quantity, sending controling instruction is given described micro-power-supply controller of electric;
(4) described control module is obtained control command by described communication module, and carries out this control command.
Further, described step (1) is specially: described measurement module comprises instrument transformer plate and the AD sampling module being connected with described instrument transformer plate; By instrument transformer plate, detect the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that described control module can be processed, and sent to described AD sampling module; Described AD sampling module is converted to digital quantity by the voltage signal receiving from described instrument transformer plate by analog quantity, and sends this digital quantity to described control module.
Further, described control module is that DSP controls processing module; Described step (4) is further divided into:
A. grid-connected control procedure: when micro-grid system is from being incorporated into the power networks when switching from Running State, described DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, described DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
B. when micro-grid system is when switching from network operation to the state that is incorporated into the power networks, described DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency;
Wherein,
Described meritorious/idle control refers to: described DSP controls processing module using the given active power of the micro-electrical network central controller receiving, reactive power as input variable, by active power, reactive power decoupling zero, through pi regulator, provide reference value for Current Control component, current error signal is for inverter provides pulse-width signal under pi regulator effect, and control inverter is exported active power, the reactive power of appointment;
Described voltage/frequency is controlled and is referred to: described DSP controls processing module using the given voltage of the micro-electrical network central controller receiving, frequency as input variable, and control inverter output voltage, frequency are constant.
Further, before the control command that described DSP control processing module is sent at the micro-electrical network central controller of execution, the control command that described DSP control processing module is sent micro-electrical network central controller according to local actual conditions is carried out validity judgement, if this control command is not accepted by micro-power supply, do not carry out this control command.
Beneficial effect of the present invention is: (1) carries out information exchange with micro-electrical network central controller, regulates active power and the reactive power of micro-power supply output according to the instruction of micro-electrical network central controller, has improved stability and the quality of power supply of system; (2) to micro-electrical network central controller, instruction can effectively judge, has improved the stability of micro-grid system operation; (3) externally by CAN bus, connect, can effectively support distributed control or control in real time; (4) grid integration of distributed energy is had to impetus, on the one hand under current policy and technical conditions, actively push forward the grid integration of new forms of energy, on the other hand, along with becoming better and approaching perfection day by day and the progressively development of micro-power grid control technology of energy policy, can on existing theoretical research and hardware foundation, complete smoothly its functions expanding, thereby realize the distributed energy micro-electrical network of access smoothly.
Accompanying drawing explanation
Fig. 1 is the structural representation that uses micro-grid control system of micro-power-supply controller of electric of the present invention.
Fig. 2 is the information flow schematic diagram between micro-power supply control of the present invention and micro-electrical network central controller.
Fig. 3 is gain merit/idle (P/Q) control block diagram of the present invention.
Fig. 4 is voltage/frequency of the present invention (U/f) control principle drawing.
Fig. 5 is voltage/frequency of the present invention (U/f) control principle drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the present invention includes communication module and control module, control module comprises measurement module and control module; Communication module is connected with control module and micro-electrical network central controller, and measurement module is connected with the micro-power supply output line road in control module and micro-grid system; Measurement module, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that control module can be processed, and converts voltage signal to digital quantity, and send digital quantity to control module by analog quantity; Control module for by obtain also/digital quantity after net on off state information and wherethrough reason sends communication module to, and the control command sent of micro-electrical network central controller of transmitting of received communication module, and carries out this control command; Communication module by from control module, receive also/from net on off state information and digital quantity, send micro-electrical network central controller to, and the control command that micro-electrical network central controller is sent sends control module to.Communication module can adopt CAN bus communication module, can effectively support distributed control or control in real time.
Measurement module specifically comprises instrument transformer plate and the AD sampling module being connected with instrument transformer plate, and instrument transformer plate is connected with the micro-power supply output line road in micro-grid system, and AD sampling module is connected with control module; Instrument transformer plate, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that control module can be processed, and is sent to AD sampling module; The voltage signal that AD sampling module is used for receiving from described instrument transformer plate is converted to digital quantity by analog quantity, and sends this digital quantity to control module.
Control module is specially DSP and controls processing module, can carry out frequency measurement to received digital quantity, calculates active power, reactive power and power angle, and also/from the double mode switching of net, meritorious/idle control and constant voltage/constant frequency, control.
When micro-grid system is from being incorporated into the power networks when switching from Running State, DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
When micro-grid system is when switching from network operation to the state that is incorporated into the power networks, DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency.
DSP control processor is according to the local information gathering and the micro-electrical network central controller controls instruction receiving, determine micro-grid system is under which kind of operational mode, automatically realize the relevant control to the switching of operational mode and local device, to guarantee local local voltage stabilization; DSP control processor can carry out according to the actual conditions of local information the judgement of validity to the control command of micro-electrical network central controller, if the instruction that micro-electrical network central controller sends is not accepted by local microenvironment power supply, can not carry out this instruction.
Fig. 2 is the information flow cardon between micro-power-supply controller of electric provided by the present invention and micro-electrical network central controller, micro-power-supply controller of electric gathers the output voltage of micro-power supply in micro-grid system by instrument transformer plate, output current, the information that AD sampling module obtains instrument transformer plate is sampled, be converted into digital quantity, transferring to DSP to control processing module processes, DSP controls micro-power circuit information (output voltage of micro-power supply that processing module output collects, electric current and on off state information), by CAN bus communication module, send to micro-electrical network central controller, and receive control command (switching control instruction and the power of micro-electrical network central controller, voltage setting value).
Fig. 3 is gain merit/idle (P/Q) control block diagram of the present invention.Meritorious/idle (P/Q) controls to use and presets value and power reference (being provided by micro-electrical network central controller) as input variable.As can be known from Fig. 3, P/Q control strategy is by meritorious, reactive power decoupling zero, through pi regulator, provides reference value for Current Control component, current error signal under pi regulator effect for inverter provides pulse-width signal.Control circuit application three-phase phase-locked loop PLL follows the tracks of the phase angle of major network voltage, for control system provides frequency, supports.P/Q control strategy is applicable to be incorporated into the power networks and also can stablizes the distributed power generation unit of power output.
Fig. 4, Fig. 5 are constant voltage/constant frequency in the present invention (U/f) control principle drawings.The voltage of inverter and FREQUENCY CONTROL are mainly from network operation, to provide strong voltage and frequency to support and have the following feature of certain load power for micro-electrical network.According to the droop characteristic shown in Fig. 4, Fig. 5, when micro-network load changes, will cause frequency and voltage fluctuation, its fluctuation situation will depend on the U/f susceptibility of droop characteristic and load.Make the U/f of micro-electrical network return to rated value, need to regulate the output of micro-power supply.Shown in Fig. 4, Fig. 5, the FREQUENCY CONTROL of micro-electrical network is to regulate the output in micro-source to make micro-mains frequency return to rated value.By parallel to the left or to the right travel frequency sagging curve, guarantee that frequency is at a steady state value.Similarly, voltage control maintains microgrid voltage at a steady state value by regulation voltage characteristic to the left or to the right.
The micro-power-supply controller of electric of use provided by the present invention realize micro-electrical network and public electric wire net also/from the method for network control system, comprise the following steps:
(1) measurement module by micro-power-supply controller of electric detects the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that described control module can be processed, by analog quantity, convert voltage signal to digital quantity, and send digital quantity to described control module;
(2) control module of micro-power-supply controller of electric obtain also/from net on off state information, and will be also/from net on off state information and digital quantity, by communication module, send micro-electrical network central controller to;
(3) micro-electrical network central controller according to receive also/from net on off state information and digital quantity, sending controling instruction is given described micro-power-supply controller of electric;
(4) control module is obtained control command by communication module, and carries out this control command.
Can use instrument transformer plate to detect the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that control module can be processed, and be sent to AD sampling module; AD sampling module is converted to digital quantity by the voltage signal receiving from instrument transformer plate by analog quantity, and sends this digital quantity to control module.
Control module adopts DSP to control processing module; Step (4) is further divided into:
A. grid-connected control procedure: when micro-grid system is from being incorporated into the power networks when switching from Running State, described DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, described DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
B. when micro-grid system is when switching from network operation to the state that is incorporated into the power networks, described DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency.
At DSP, control before processing module carries out the control command that micro-electrical network central controller sends, the control command that described DSP control processing module is sent micro-electrical network central controller according to local actual conditions is carried out validity judgement, if this control command is not accepted by micro-power supply, do not carry out this control command.Although the present invention is with preferred embodiment openly as above, they are not for limiting the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the invention, and certainly when making various changes or retouch, but equally within protection scope of the present invention.What therefore protection scope of the present invention should be defined with the application's claim protection range is as the criterion.
Claims (9)
1. a micro-power-supply controller of electric, is characterized in that, comprises communication module and control module, and described control module comprises measurement module and control module; Described communication module is connected with described control module and micro-electrical network central controller, and described measurement module is connected with the micro-power supply output line road in described control module and micro-grid system;
Described measurement module, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that described control module can be processed, and converts voltage signal to digital quantity by analog quantity, and sends digital quantity to described control module;
Described control module for by obtain also/digital quantity after net on off state information and wherethrough reason sends described communication module to, and receives the control command that micro-electrical network central controller that described communication module transmits sends, and carries out this control command;
Described communication module by from described control module, receive also/from net on off state information and digital quantity, send micro-electrical network central controller to, and the control command that micro-electrical network central controller is sent sends described control module to.
2. micro-power-supply controller of electric as claimed in claim 1, is characterized in that, described measurement module comprises instrument transformer plate and the AD sampling module being connected with described instrument transformer plate; Described instrument transformer plate is connected with the micro-power supply output line road in micro-grid system, and described AD sampling module is connected with described control module; Described instrument transformer plate, for detection of the voltage and current on micro-power supply output line road, is converted to by current signal the voltage signal that described control module can be processed, and is sent to described AD sampling module; The voltage signal that described AD sampling module is used for receiving from described instrument transformer plate is converted to digital quantity by analog quantity, and sends this digital quantity to described control module.
3. micro-power-supply controller of electric as claimed in claim 1 or 2, is characterized in that, described control module is that DSP controls processing module; Described DSP controls processing module received digital quantity is carried out to frequency measurement, calculates active power, reactive power and power angle, and also/from the double mode switching of net, meritorious/idle control and constant voltage/constant frequency, control;
When micro-grid system is from being incorporated into the power networks when switching from Running State, described DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, described DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
When micro-grid system is when switching from network operation to the state that is incorporated into the power networks, described DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency;
Described gain merit/idle control refers to, described DSP controls processing module using the given active power of the micro-electrical network central controller receiving, reactive power as input variable, by active power, reactive power decoupling zero, through pi regulator, provide reference value for Current Control component, current error signal is for inverter provides pulse-width signal under pi regulator effect, and control inverter is exported active power, the reactive power of appointment;
Described voltage/frequency is controlled and is referred to, described DSP controls processing module using the given voltage of the micro-electrical network central controller receiving, frequency as input variable, and control inverter output voltage, frequency are constant.
4. micro-power-supply controller of electric as claimed in claim 3, it is characterized in that, before the control command that described DSP control processing module is sent at the micro-electrical network central controller of execution, the control command that described DSP control processing module is sent micro-electrical network central controller according to local actual conditions is carried out validity judgement, if this control command is not accepted by micro-power supply, do not carry out this control command.
5. micro-power-supply controller of electric as claimed in claim 1 or 2, is characterized in that, described communication module is CAN bus communication module.
6. use micro-power-supply controller of electric realize micro-electrical network and public electric wire net also/from a method for network control system, it is characterized in that, comprise the following steps:
(1) measurement module by micro-power-supply controller of electric detects the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that described control module can be processed, by analog quantity, convert voltage signal to digital quantity, and send digital quantity to described control module;
(2) control module of micro-power-supply controller of electric obtain also/from net on off state information, and will be also/from net on off state information and digital quantity, by communication module, send micro-electrical network central controller to;
(3) micro-electrical network central controller according to receive also/from net on off state information and digital quantity, sending controling instruction is given described micro-power-supply controller of electric;
(4) described control module is obtained control command by described communication module, and carries out this control command.
The micro-power-supply controller of electric of use as claimed in claim 6 realize micro-electrical network and public electric wire net also/from the method for network control system, it is characterized in that, described step (1) is specially: described measurement module comprises instrument transformer plate and the AD sampling module being connected with described instrument transformer plate; By instrument transformer plate, detect the voltage and current on micro-power supply output line road, current signal is converted to the voltage signal that described control module can be processed, and sent to described AD sampling module; Described AD sampling module is converted to digital quantity by the voltage signal receiving from described instrument transformer plate by analog quantity, and sends this digital quantity to described control module.
The micro-power-supply controller of electric of use as described in claim 6 or 7 realize micro-electrical network and public electric wire net also/from the method for network control system, it is characterized in that, described control module is that DSP controls processing module; Described step (4) is further divided into:
A. grid-connected control procedure: when micro-grid system is from being incorporated into the power networks when switching from Running State, described DSP controls processing module and receives the control command that micro-electrical network central controller sends, and control inverter using the amplitude of the given voltage of micro-electrical network central controller and phase place amplitude and the phase reference value in the voltage close loop under Running State is controlled, inverter is controlled by voltage close loop subsequently, make output voltage progressively rise to load voltage rated value, described DSP controls processing module control inverter and is switched to voltage/frequency and controlled by gain merit/idle control, and along with micro-grid system load change regulates,
B. when micro-grid system is when switching from network operation to the state that is incorporated into the power networks, described DSP controls the voltage that processing module receives the control command of micro-electrical network central controller transmission and monitors micro-grid system, control inverter adopts voltage close loop to control, output voltage is synchronizeed with public electric wire net voltage, when inverter output voltage amplitude being detected when consistent with public electric wire net with phase place, described in closure also/from net switch, DSP controls processing module control inverter and is controlled and switched to meritorious/idle control by voltage/frequency;
Wherein,
Described gain merit/idle control refers to, described DSP controls processing module using the given active power of the micro-electrical network central controller receiving, reactive power as input variable, by active power, reactive power decoupling zero, through pi regulator, provide reference value for Current Control component, current error signal is for inverter provides pulse-width signal under pi regulator effect, and control inverter is exported active power, the reactive power of appointment;
Described voltage/frequency is controlled and is referred to, described DSP controls processing module using the given voltage of the micro-electrical network central controller receiving, frequency as input variable, and control inverter output voltage, frequency are constant.
The micro-power-supply controller of electric of use as claimed in claim 8 realize micro-electrical network and public electric wire net also/from the method for network control system, it is characterized in that, before the control command that described DSP control processing module is sent at the micro-electrical network central controller of execution, the control command that described DSP control processing module is sent micro-electrical network central controller according to local actual conditions is carried out validity judgement, if this control command is not accepted by micro-power supply, do not carry out this control command.
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