CN117578697A - Mining emergency energy storage converter and control method - Google Patents
Mining emergency energy storage converter and control method Download PDFInfo
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- CN117578697A CN117578697A CN202410050275.XA CN202410050275A CN117578697A CN 117578697 A CN117578697 A CN 117578697A CN 202410050275 A CN202410050275 A CN 202410050275A CN 117578697 A CN117578697 A CN 117578697A
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Abstract
The invention provides a mining emergency energy storage converter and a control method. The control method of the invention supplies power to the latter equipment through a bidirectional triple staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit which are arranged in the energy storage converter, and comprises the following steps: acquiring the power grid voltage and the battery voltage of an energy storage converter; judging the state of the power grid according to the power grid voltage; in a grid-connected state, when the battery of the energy storage converter can be charged according to the battery voltage judgment, the battery of the energy storage converter is charged; in the off-grid state, controlling a battery of the energy storage converter to supply power to the later-stage equipment through a bidirectional triple-staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit; the bidirectional triple interleaving DC/DC circuit is used for adjusting the capacitor voltage; the three-level NPC circuit is used for operating as a grid-connected PCS or a frequency converter; the LC filter circuit is used to filter the current. The control method of the invention meets the requirement of emergency power supply for the subsequent-stage equipment.
Description
Technical Field
The invention relates to the technical field of energy storage converters, in particular to a mining emergency energy storage converter and a control method.
Background
Energy storage converters are widely used as emergency power supply devices. The energy storage converter is used for realizing energy interaction between the energy storage medium and the power grid and supplying power to the latter-stage equipment in a grid-connected state of the power grid, and supplying power to the latter-stage equipment through the energy storage medium in a grid-disconnected state. However, how to ensure smooth and stable power supply of the energy storage battery under the grid-connected and grid-disconnected states becomes a problem to be solved, especially when the latter-stage equipment is a mine ventilator.
Disclosure of Invention
In order to solve the technical problems, the invention provides the mining emergency energy storage converter and the control method, which can improve the conversion efficiency, ensure the reliable operation of the energy storage converter in off-grid and grid-connected states, and meet the emergency power supply of the subsequent equipment.
Therefore, the first aim of the invention is to provide a control method of the mining emergency energy storage converter.
The second aim of the invention is to provide a mining emergency energy storage converter.
The third object of the invention is to provide a control device of the mining emergency energy storage converter.
A fourth object of the present invention is to provide a readable storage medium.
The fifth object of the invention is to provide a control system of the mining emergency energy storage converter.
In order to achieve the first object of the present invention, the technical scheme of the present invention provides a control method of a mining emergency energy storage converter, the control method supplies power to a post-stage device by the energy storage converter through a bidirectional triple interleaving DC/DC circuit, a three-level NPC circuit and an LC filter circuit which are arranged in the energy storage converter, the control method comprises: acquiring the power grid voltage and the battery voltage of an energy storage converter; judging the state of the power grid according to the power grid voltage; in a grid-connected state, when the battery of the energy storage converter can be charged according to the battery voltage judgment, the battery of the energy storage converter is charged; in the off-grid state, controlling a battery of the energy storage converter to supply power to the later-stage equipment through a bidirectional triple-staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit; the bidirectional triple interleaving DC/DC circuit is used for adjusting the capacitor voltage; the three-level NPC circuit is used for operating as a grid-connected PCS or a frequency converter; the LC filter circuit is used to filter the current.
Further, the control method can sample analog quantities of the grid voltage and the battery voltage of the energy storage converter through the voltage sensor.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: according to the invention, the energy storage converter is supplied with power to the later-stage equipment in the grid-connected and off-grid states through the bidirectional triple staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit which are arranged in the energy storage converter, so that the high power density and low output ripple are satisfied, the energy loss is effectively reduced, and the conversion efficiency is improved. Judging the state of the power grid through the power grid voltage, and charging the battery of the energy storage converter when the battery in the energy storage converter can be charged according to the battery voltage judgment in the grid-connected state, wherein the power of the later-stage equipment is supplied by the power grid; in the off-grid state, the battery of the energy storage converter is controlled to supply power to the later-stage equipment through the bidirectional triple-staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit. The control method of the energy storage converter can rapidly switch the control mode under the condition of unstable power grid voltage or broken network state, and stably supplies power to the later-stage equipment.
In one technical scheme of the invention, the power supply of the battery for controlling the energy storage converter to the later-stage equipment through the bidirectional triple-staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit specifically comprises the following steps: controlling a bidirectional triple staggered DC/DC circuit to discharge a battery of the energy storage converter according to the power grid voltage and the battery voltage of the energy storage converter; controlling the three-level NPC circuit to operate as a frequency converter; and controlling the LC filter circuit to filter and supply power to the subsequent-stage equipment.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: when the power grid is in the off-grid state according to the power grid voltage, the battery of the energy storage converter is controlled to discharge according to the battery voltage of the current energy storage converter so as to carry out emergency power supply on the later-stage equipment, and the later-stage equipment can stably operate under the condition that the power grid voltage is unstable or the power grid is disconnected. The method is specifically characterized by comprising the following steps of: firstly, when a bidirectional triple staggered DC/DC circuit is used for discharging a battery of an energy storage converter, the capacitor voltage is adjusted; secondly, controlling the three-level NPC circuit to operate as a frequency converter, and carrying out frequency conversion operation on the discharged current so as to enable the current after frequency conversion to meet the requirement of supplying power to the later-stage equipment; and thirdly, the LC filter circuit is controlled to filter the power supply current so as to supply power to the later-stage equipment, so that the energy loss is effectively reduced, the conversion efficiency is improved, meanwhile, harmonic components are reduced, and parallel calculation can be realized by using hardware or software so as to improve the real-time responsiveness and the calculation efficiency. The control method ensures stable power supply of the latter equipment in the off-grid state of the power grid, ensures stable operation of the latter equipment, and avoids influence and potential safety hazard on the work of the latter equipment caused by unstable power supply.
In one technical scheme of the invention, the control of the bidirectional triple staggered DC/DC circuit for discharging the battery of the energy storage converter specifically comprises the following steps: the bidirectional triple staggered DC/DC circuit improves voltage according to the battery voltage and the power grid voltage of the energy storage converter.
Further, the control method may be controlled by a closed loop; specifically including a voltage closed loop.
Further, the control method may include a neural network PI controller; specifically including PWM control algorithms.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: and the discharge voltage of the battery of the energy storage converter is increased through the bidirectional triple staggered DC/DC circuit, the discharge voltage is increased to the direct-current side capacitor voltage corresponding to the grid voltage in the grid-connected state, and the smooth switching of the battery of the energy storage converter when the battery supplies power to the later-stage equipment is improved.
In one technical scheme of the invention, the control of the three-level NPC circuit as a frequency converter specifically comprises the following steps: obtaining a fundamental wave phase according to the power grid voltage; and performing frequency conversion phase locking according to the fundamental wave phase.
Furthermore, the control method can obtain the fundamental wave phase through a three-phase grid phase-locked loop (PLL) technology.
Further, the control method can perform variable frequency phase locking through second-order generalized integration.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: when the energy storage converter is in an off-grid state, the fundamental wave phase can be obtained according to the grid voltage in the grid-connected state, and frequency conversion phase locking is carried out when the battery post-stage equipment of the energy storage converter supplies power, so that the control method can convert the direct current of the battery into three-phase alternating current matched with the grid voltage by controlling the three-level NPC circuit, a three-phase power supply with the same phase as the grid phase is provided for the post-stage equipment, reliable operation of the energy storage converter in the off-grid and grid-connected states is effectively ensured, the energy storage converter is quickly adjusted, and smooth switching of power supply and robustness of the control method are effectively realized.
In one technical scheme of the invention, when the battery of the energy storage converter can be charged according to the battery voltage judgment, the charging of the battery of the energy storage converter specifically comprises the following steps: judging whether the battery voltage of the energy storage converter is smaller than a given battery voltage; and when the battery voltage of the energy storage converter is smaller than the given battery voltage, charging the battery of the energy storage converter.
Further, the control method can judge whether the battery voltage of the energy storage converter is smaller than a given battery voltage through the double closed-loop control structure. Specifically, the dual closed loop control structure includes a voltage outer loop and a current inner loop.
Further, the battery voltage of the energy storage converterTo a given batteryPressure->Comparing to obtain the current +.>Is>The method comprises the steps of carrying out a first treatment on the surface of the Judging through a neural network PI controller, and carrying out current +.>Less than a given current->And charging the battery of the energy storage converter.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: in the grid-connected state, the power supply is performed on the rear-stage equipment through the power grid, and when the battery voltage of the energy storage converter is judged to be smaller than the given battery voltage, the battery of the energy storage converter is charged, so that the battery of the energy storage converter can keep a state with sufficient electric quantity as far as possible, and the power supply on the rear-stage equipment is performed under the off-grid state.
In one aspect of the present invention, charging a battery of an energy storage converter specifically includes: controlling an LC filter circuit to filter the power grid current; obtaining a phase angle according to the filtered grid current; according to the phase angle, controlling a three-level NPC circuit as a grid-connected PCS to rectify grid current to obtain direct current; and controlling the bidirectional triple interleaving DC/DC circuit to charge the battery according to the direct current.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: when the battery of the energy storage converter can be charged in a grid-connected state, the LC filter circuit is controlled to filter the current of the power grid, the phase angle is obtained according to the filtered voltage of the power grid, the three-level NPC circuit is controlled to rectify the three-phase current of the power grid into direct current according to the phase angle, the two-way triple staggered DC/DC circuit is controlled to reduce the direct current voltage to the voltage levels at two ends of the battery according to the direct current so as to charge the battery, high power density and low output ripple are effectively realized, the energy loss of the voltage of the current is effectively reduced, and the conversion efficiency of the control method is improved.
In order to achieve the second object of the present invention, the technical scheme of the present invention provides a mining emergency energy storage converter, the energy storage converter includes: a bidirectional triple interleaved DC/DC circuit; a three-level NPC circuit; an LC filter circuit; a processor, a memory and a program or instructions stored in the memory and executable on the processor, the program or instructions implementing the steps of the control method according to any of the claims of the present invention when executed by the processor.
The energy storage converter according to the technical scheme of the invention realizes the steps of the control method according to any technical scheme of the invention, so that the energy storage converter has all the beneficial effects of the control method according to any technical scheme of the invention, and the detailed description is omitted.
In order to achieve the third object of the present invention, the technical scheme of the present invention provides a control device for a mining emergency energy storage converter, the control device includes: the acquisition module is used for acquiring the power grid voltage and the battery voltage of the energy storage converter; the judging module is used for judging the state of the power grid according to the power grid voltage; the execution module is used for executing the charging of the battery of the energy storage converter; the control module is used for controlling the battery of the energy storage converter to supply power to the later-stage equipment through the bidirectional triple-staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit; the energy storage converter control method is realized by matching the acquisition module, the judgment module, the execution module and the control module.
The control device according to the technical scheme of the present invention realizes the steps of the control method according to any technical scheme of the present invention, so that the control device according to any technical scheme of the present invention has all the beneficial effects of the control method according to any technical scheme of the present invention, and will not be described in detail herein.
To achieve the fourth object of the present invention, a readable storage medium is provided, on which a program or an instruction is stored, which when executed by a processor, implements the steps of the control method according to any one of the aspects of the present invention.
The readable storage medium according to the technical scheme of the present invention implements the steps of the control method according to any of the technical scheme of the present invention, so that the method according to any of the technical scheme of the present invention has all the advantages, and will not be described herein.
In order to achieve the fifth object of the present invention, the technical scheme of the present invention provides a control system of a mining emergency energy storage converter, the control system comprising: the energy storage converter comprises a control device; the rear-stage equipment comprises a mine ventilator; the power grid is used for supplying power to the back-stage equipment and/or the energy storage converter in a grid-connected state.
The control system according to the technical scheme of the present invention realizes the steps of the control method according to any technical scheme of the present invention, so that the control system has all the advantages of the control method according to any technical scheme of the present invention, and is not described herein.
Drawings
Fig. 1 is a flowchart of a control method of an energy storage converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an energy storage converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a triple interleaved DC/DC circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-level NPC circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an IGBT driving circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a control method of an energy storage converter according to an embodiment of the present invention;
FIG. 7 is a second schematic diagram of a control method of an energy storage converter according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a control device according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a control system of an energy storage converter according to an embodiment of the invention.
Reference numerals illustrate:
100-a control device; 110-an acquisition module; 120-judging module; 130-an execution module; 140-control module.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The following describes some embodiments of the present invention with reference to fig. 1 to 9.
Referring to fig. 1, an embodiment of the present invention provides a control method of a mining emergency energy storage converter, where the control method supplies power to a later-stage device by the energy storage converter through a bidirectional triple-interleaved DC/DC circuit, a three-level NPC circuit and an LC filter circuit disposed in the energy storage converter, and the control method includes: acquiring the power grid voltage and the battery voltage of an energy storage converter; judging the state of the power grid according to the power grid voltage; in a grid-connected state, when the battery of the energy storage converter can be charged according to the battery voltage judgment, the battery of the energy storage converter is charged; in the off-grid state, controlling a battery of the energy storage converter to supply power to the later-stage equipment through a bidirectional triple-staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit; the bidirectional triple interleaving DC/DC circuit is used for adjusting the capacitor voltage; the three-level NPC circuit is used for operating as a grid-connected PCS or a frequency converter; the LC filter circuit is used to filter the current.
Referring to fig. 2 to 7, the control method may sample the grid voltage and the battery voltage of the energy storage converter by means of a voltage sensor, for example. For example, the latter device is a ventilator. In the grid-connected state, when the energy storage converter can be charged through the power grid, the ventilator is directly powered by the power grid, the power grid side contactor 3 is closed, the contactor 2 and the contactor 1 are connected, and the circuit connection mode is the same as that of off-grid. For example, the control system adopts a DSP+FPGA structure to collect contactor, power grid voltage, power grid current, IGBT pulse signals and direct currentCurrent side voltage, energy storage battery sampling, etc. In the off-grid state, at this time, the battery of the energy storage converter directly supplies power to the ventilator, the power grid side contactor 3 is disconnected, and the energy storage battery side is connected with the fast fuse first, so that current hardware protection is performed. The three-level NPC circuit is used for converting the power grid voltageThe phase lock angle of the power grid voltage is obtained by a control system phase-locked loop (PLL) technology>Obtaining +.about.via park transformation and clark>And according to the grid current, obtaining +.>. The current inner loop is given +.>Is 0, a given +.>Then through decoupling and actual +.>Comparing and analyzing the values; set value of voltage outer ring->Pass and actually->The d-axis component of the actual current is obtained after comparison analysis and PI self-adaptive control through a neural network>Then through neural network PI self-adaptive control and decoupling and actual +.>The values were subjected to a comparative analysis,and reversely transforming the compared values through a clamp and a park to obtain a three-phase modulation wave, and finally triggering a pulse to a three-level NPC circuit switch tube through an SVPWM algorithm to convert the three-phase current into direct current. When the power grid is off-grid, the energy storage battery directly supplies power to the ventilator, the power grid side contactor 3 is disconnected, and the energy storage battery side is connected with the fast fuse first to conduct current hardware protection. The contactor 1 is connected with the pre-charging resistor in parallel, before the contactor 1 is closed, the pre-charging resistor is used for charging the capacitor in the subsequent-stage bidirectional triple-staggered DC/DC circuit, and when the capacitor voltage meets a certain range, the contactor is closed again, so that the pre-charging resistor is bypassed. The contactor 2 is connected in parallel with a pre-charge resistor through which the contactor 2 passes before closing. The phase angle obtained by second-order generalized integral phase locking obtained by obtaining the power grid voltage sampling is similar to the grid-connected state, the grid-connected and off-grid control systems are mutually independent, and the overall control state is determined by the contactor 3 in fig. 1 that the bidirectional triple staggered DC/DC circuit and the three-level NPC circuit adopt a common DC bus structure. The three-level NPC circuit is connected with the LC filter circuit to realize selective attenuation or amplification of the frequency of the input signal.
According to the invention, the energy storage converter is supplied with power to the later-stage equipment in the grid-connected and off-grid states through the bidirectional triple staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit which are arranged in the energy storage converter, so that the high power density and low output ripple are satisfied, the energy loss is effectively reduced, and the conversion efficiency is improved. Judging the state of the power grid through the power grid voltage, and charging the battery of the energy storage converter when the battery in the energy storage converter can be charged according to the battery voltage judgment in the grid-connected state, wherein the power of the later-stage equipment is supplied by the power grid; in the off-grid state, the battery of the energy storage converter is controlled to supply power to the later-stage equipment through the bidirectional triple-staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit. The control method of the energy storage converter can rapidly switch the control mode under the condition of unstable power grid voltage or broken network state, and stably supplies power to the later-stage equipment.
In some implementations of the embodiments of the present application, controlling the battery of the energy storage converter to supply power to the subsequent stage device through the bidirectional triple interleaved DC/DC circuit, the three-level NPC circuit, and the LC filter circuit specifically includes: controlling a bidirectional triple staggered DC/DC circuit to discharge a battery of the energy storage converter according to the power grid voltage and the battery voltage of the energy storage converter; controlling the three-level NPC circuit to operate as a frequency converter; and controlling the LC filter circuit to filter and supply power to the subsequent-stage equipment.
When the power grid is judged to be in an off-grid state according to the power grid voltage, the battery of the energy storage converter is controlled to discharge according to the battery voltage of the current energy storage converter, so that emergency power supply is carried out on the later-stage equipment, and the later-stage equipment can operate stably under the condition that the power grid voltage is unstable or is in an off-grid state. The method is specifically characterized by comprising the following steps of: firstly, when a bidirectional triple staggered DC/DC circuit is used for discharging a battery of an energy storage converter, the capacitor voltage is adjusted; secondly, controlling the three-level NPC circuit to operate as a frequency converter, and carrying out frequency conversion operation on the discharged current so as to enable the current after frequency conversion to meet the requirement of supplying power to the later-stage equipment; and thirdly, the LC filter circuit is controlled to filter the power supply current so as to supply power to the later-stage equipment, so that the energy loss is effectively reduced, the conversion efficiency is improved, meanwhile, harmonic components are reduced, and parallel calculation can be realized by using hardware or software so as to improve the real-time responsiveness and the calculation efficiency. The control method ensures stable power supply of the latter equipment in the off-grid state of the power grid, ensures stable operation of the latter equipment, and avoids influence and potential safety hazard on the work of the latter equipment caused by unstable power supply.
In some implementations of embodiments of the present application, controlling a bi-directional triple interleaved DC/DC circuit for discharging a battery of an energy storage converter specifically includes: the bidirectional triple staggered DC/DC circuit improves voltage according to the battery voltage and the power grid voltage of the energy storage converter.
For example, the control method may be by closed loop control; specifically including a voltage closed loop.
For example, the control method may include a neural network PI controller; specifically including PWM control algorithms. Specifically, for the bidirectional triple-staggered DC/DC circuit, comparison is performed through neural network PI self-adaptive control, the duty ratio is given through neural network PI self-adaptive control, the triggering pulse of a switching tube is given through PWM control technology, when the battery of the energy storage converter is charged, the three-level NPC circuit operates as a grid-connected PCS, and the energy storage converter is charged through the bidirectional triple-staggered DC/DC circuit.
According to the invention, the discharge voltage of the battery of the energy storage converter is increased through the bidirectional triple staggered DC/DC circuit, the discharge voltage is increased to the direct-current side capacitor voltage corresponding to the grid voltage in the grid-connected state, and the smooth switching of the battery of the energy storage converter when the battery supplies power to the later-stage equipment is improved.
In some implementations of the embodiments of the present application, controlling the operation of the three-level NPC circuit as a frequency converter specifically includes: obtaining a fundamental wave phase according to the power grid voltage; and performing frequency conversion phase locking according to the fundamental wave phase.
For example, the control method may obtain the fundamental phase through a three-phase grid phase-locked loop PLL technique.
For example, the control method may perform variable frequency phase locking by second order generalized integration.
According to the invention, when the energy storage converter is in the off-grid state, the fundamental wave phase can be obtained according to the grid voltage in the grid-connected state, and the frequency conversion phase lock is carried out when the battery post-stage equipment of the energy storage converter supplies power, so that the control method can convert the direct current of the battery into three-phase alternating current matched with the grid voltage by controlling the three-level NPC circuit, thereby providing the three-phase power supply with the same phase as the grid for the post-stage equipment, effectively ensuring the reliable operation of the energy storage converter in the off-grid and grid-connected states, quickly regulating the operation, and effectively realizing the smooth switching of the power supply and the robustness of the control method.
In some implementations of the embodiments of the present application, when it is determined that charging the battery of the energy storage converter may be performed according to the battery voltage, charging the battery of the energy storage converter specifically includes: judging whether the battery voltage of the energy storage converter is smaller than a given battery voltage; and when the battery voltage of the energy storage converter is smaller than the given battery voltage, charging the battery of the energy storage converter.
For example, the control method may determine whether the battery voltage of the energy storage converter is less than a given battery voltage through a dual closed loop control structure. Specifically, the dual closed loop control structure includes a voltage outer loop and a current inner loop.
For example, the battery voltage of an energy storage converterIs +.>Comparing to obtain the current +.>Is>The method comprises the steps of carrying out a first treatment on the surface of the Judging through a neural network PI controller, and carrying out current +.>Less than a given current->And charging the battery of the energy storage converter.
In the grid-connected state, the power supply is performed on the rear-stage equipment through the power grid, and when the battery voltage of the energy storage converter is judged to be smaller than the given battery voltage, the battery of the energy storage converter is charged, so that the battery of the energy storage converter can keep a state with sufficient electric quantity as far as possible, and the power supply on the rear-stage equipment is performed under the off-grid state.
In some implementations of the embodiments of the present application, charging the battery of the energy storage converter specifically includes: controlling an LC filter circuit to filter the power grid current; obtaining a phase angle according to the filtered grid current; according to the phase angle, controlling a three-level NPC circuit as a grid-connected PCS to rectify grid current to obtain direct current; and controlling the bidirectional triple interleaving DC/DC circuit to charge the battery according to the direct current.
When the battery of the energy storage converter can be charged in a grid-connected state, the LC filter circuit is controlled to filter the current of the power grid, the phase angle is obtained according to the filtered voltage of the power grid, the three-level NPC circuit is controlled to rectify the three-phase current of the power grid into direct current according to the phase angle, the two-way triple staggered DC/DC circuit is controlled to reduce the direct current voltage to the voltage levels at two ends of the battery according to the direct current so as to charge the battery, high power density and low output ripple are effectively realized, the energy loss of the voltage of the current is effectively reduced, and the conversion efficiency of the control method is improved.
In some implementations of the embodiments of the present application, a mining emergency energy storage converter is provided, the energy storage converter including: a bidirectional triple interleaved DC/DC circuit; a three-level NPC circuit; an LC filter circuit; a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the control method as in any of the embodiments of the invention.
The energy storage converter according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, so that the energy storage converter has all the advantages of the control method according to any embodiment of the present invention, and is not described herein.
Referring to fig. 8, in some implementations of the embodiments of the present application, there is provided a control device for a mining emergency energy storage converter, where the control device 100 includes: the acquisition module 110 is used for acquiring the power grid voltage and the battery voltage of the energy storage converter; the judging module 120, the judging module 120 is used for judging the state of the power grid according to the power grid voltage; the execution module 130 is used for executing the charging of the battery of the energy storage converter; the control module 140 is used for controlling the battery of the energy storage converter to supply power to the later-stage equipment through the bidirectional triple-staggered DC/DC circuit, the three-level NPC circuit and the LC filter circuit; the obtaining module 110, the judging module 120, the executing module 130 and the control module 140 cooperate to implement the control method of the energy storage converter according to any of the technical schemes of the invention.
The control device according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, so that the control device has all the advantages of the control method according to any embodiment of the present invention, and will not be described herein.
In some implementations of embodiments of the present application, a readable storage medium is provided, on which a program or instructions are stored which, when executed by a processor, implement the steps of a control method as in any of the embodiments of the present invention.
The readable storage medium according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, so that the method according to any embodiment of the present invention has all the advantages and effects of the control method according to any embodiment of the present invention, and will not be described herein.
In some implementations of the embodiments of the present application, a control system for a mining emergency energy storage converter is provided, the control system including: the energy storage converter comprises the control device of any embodiment; the rear-stage equipment comprises a mine ventilator; the power grid is used for supplying power to the back-stage equipment and/or the energy storage converter in a grid-connected state.
For example, referring to FIG. 9, the control system employs neural network adaptive control, instead of conventional PID control, BP neural network regulation. j is the input layer, i is the hidden layer, and l is the output layer. The input layer has 3 nodes: a given value, an actual value, and an error value; the output layer has 2 nodes: a scaling coefficient kp and an integration coefficient ki; the hidden layer has 5 nodes. The BP neural network continuously carries out circulation and weight adjustment through forward propagation and backward propagation, so that the BP neural network is learned, and the online adjustment of the comparison coefficient kp and the integration coefficient ki is realized. The method for online adjustment of the PI controller parameters by adopting the neural network comprises the following steps: (1) establishing a BP neural network structure, giving an initial weighting coefficient of each layer, selecting an inertia coefficient, and selecting a learning rate; (2) determining a given value and an actual value; (3) respectively inputting the given value and the actual value in the step (2) into a neural network, and outputting kp and ki through calculation of an input layer and an hidden layer; (4) continuously adjusting the weighting coefficient through weight learning, and setting PI parameters; (5) and (4) entering the next sampling period, and returning to the step (2). The control system adopts a DSP+FPGA control system and a main loop; the DSP+FPGA control system realizes stable switching of the ventilator in off-grid and grid-connected states; the main loop comprises a bidirectional triple-staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit; the DSP+FPGA control system samples analog signals to generate pulse driving signals, is connected with a driving module of a main loop of the bidirectional triple-staggered DC/DC circuit and the three-level NPC circuit, and drives a power device of the control system to output voltage pulses, so that the triple-staggered DC/DC and the three-level NPC circuit are controlled, and the off-grid and grid-connected state stable switching control is realized.
The control system according to the embodiment of the present invention implements the steps of the control method according to any embodiment of the present invention, so that the control system has all the advantages of the control method according to any embodiment of the present invention, and will not be described herein.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, 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 present invention. In this specification, schematic representations of the above terms 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.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (7)
1. The control method of the mining emergency energy storage converter is characterized in that the control method supplies power to the later-stage equipment through a bidirectional triple-staggered DC/DC circuit, a three-level NPC circuit and an LC filter circuit which are arranged in the energy storage converter, and the control method comprises the following steps:
acquiring power grid voltage and battery voltage of the energy storage converter;
judging the state of the power grid according to the power grid voltage;
in a grid-connected state, when the battery of the energy storage converter can be charged according to the battery voltage, charging the battery of the energy storage converter;
in an off-grid state, controlling a battery of the energy storage converter to supply power to the rear-stage equipment through the bidirectional triple-interleaved DC/DC circuit, the three-level NPC circuit and the LC filter circuit;
the bidirectional triple interleaving DC/DC circuit is used for adjusting capacitance voltage;
the three-level NPC circuit is used for operating as a grid-connected PCS or a frequency converter;
the LC filter circuit is used for filtering the current.
2. The control method according to claim 1, wherein the controlling the battery of the energy storage converter to supply power to the subsequent-stage device through the bidirectional triple interleaved DC/DC circuit, the three-level NPC circuit, and the LC filter circuit specifically includes:
controlling the bidirectional triple staggered DC/DC circuit to discharge a battery of the energy storage converter according to the power grid voltage and the battery voltage of the energy storage converter;
controlling the three-level NPC circuit to operate as a frequency converter;
and controlling the LC filter circuit to filter and supplying power to the rear-stage equipment.
3. The control method according to claim 2, wherein the controlling the bidirectional triple interleaved DC/DC circuit to discharge the battery of the energy storage converter specifically comprises:
and the bidirectional triple staggered DC/DC circuit improves the voltage according to the battery voltage of the energy storage converter and the power grid voltage.
4. The control method according to claim 2, wherein controlling the three-level NPC circuit to operate as a frequency converter specifically comprises:
obtaining a fundamental wave phase according to the grid voltage;
and performing variable frequency phase locking according to the fundamental wave phase.
5. The control method according to any one of claims 1 to 4, wherein when it is determined that charging of the battery of the energy storage converter can be performed according to the battery voltage, charging the battery of the energy storage converter specifically includes:
judging whether the battery voltage of the energy storage converter is smaller than a given battery voltage or not;
and when the battery voltage of the energy storage converter is smaller than a given battery voltage, charging the battery of the energy storage converter.
6. The control method according to claim 5, wherein charging the battery of the energy storage converter specifically comprises:
controlling the LC filter circuit to filter the power grid current;
obtaining a phase angle according to the filtered power grid current;
according to the phase angle, the three-level NPC circuit is controlled to serve as the grid-connected PCS to rectify the grid current, and direct current is obtained;
and controlling the bidirectional triple interleaving DC/DC circuit to charge a battery according to the direct current.
7. An emergency energy storage converter for a mine, characterized in that the energy storage converter comprises:
a bidirectional triple interleaved DC/DC circuit;
a three-level NPC circuit;
an LC filter circuit;
a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the control method according to any one of claims 1 to 6.
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