CN112242699B - Improved self-adaptive active damping control method for isolated direct-current micro-grid - Google Patents
Improved self-adaptive active damping control method for isolated direct-current micro-grid Download PDFInfo
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- CN112242699B CN112242699B CN201910649321.7A CN201910649321A CN112242699B CN 112242699 B CN112242699 B CN 112242699B CN 201910649321 A CN201910649321 A CN 201910649321A CN 112242699 B CN112242699 B CN 112242699B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The invention discloses an improved self-adaptive active damping control method of an isolated direct current micro-grid DC-DC converter, which comprises the steps of establishing an isolated direct current micro-grid model, measuring signals, controlling the self-adaptive active damping, controlling voltage without deviation and obtaining a duty ratio. The invention adopts an improved self-adaptive active damping control method, and simultaneously introduces self-adaptive active damping control and voltage non-deviation control, wherein the self-adaptive active damping control improves the stability margin of an isolated DC micro-grid system, and the voltage non-deviation control reduces the DC bus voltage deviation caused by a self-adaptive active damping control strategy, and the self-adaptive active damping control and the voltage non-deviation control act together, thereby being beneficial to the safe and stable operation of the DC micro-grid.
Description
Technical Field
The invention relates to an improved self-adaptive active damping control method applied to an isolated direct current micro-grid storage battery DC-DC converter, which increases direct current bus voltage unbiased control on the basis of a self-adaptive active damping control strategy, improves the stability of a system and reduces direct current bus voltage deviation caused by the self-adaptive active damping control strategy, and belongs to the technical field of power supply control.
Background
In order to alleviate the problems of energy shortage and environmental pollution, a large amount of new energy sources such as solar energy, wind energy and the like are accessed, and the micro-grid is widely applied as an effective way for exerting the efficiency of a distributed power supply. The micro-grid realizes energy control and conversion by using a power electronic converter, and has two modes of grid-connected operation and isolated operation. When the large power grid fails, the micro power grid is converted into an island operation mode to continuously provide electric energy for loads, so that the reliability and the safety of power supply are improved. With the continuous increase of direct current power sources and direct current loads, direct current micro-grids are rapidly developed. Compared with an alternating-current micro-grid, the direct-current micro-grid has the advantages of simple control structure, high conversion efficiency, no need of considering the tracking of the phase and frequency of voltage and reactive compensation, and great advantages.
As the only index for measuring the power balance in the direct-current micro-grid, the stability of the direct-current bus voltage is an important target for controlling the direct-current micro-grid. However, the constant power load shows a negative damping characteristic, and a large amount of access can reduce the system damping and influence the system stability, so that the application of the direct current micro-grid is restricted.
In order to improve the stability of the dc micro grid, many scholars have proposed various solutions. Ji Yu et al in the technical electrician journal, 2018, 33 (2): the active damping method for improving the stability of the direct-current micro-grid is provided for a grid-connected converter in 370-379, but a specific design method of parameters of an active damping controller is not provided. Guo Li et al in chinese motor engineering, 2016, 36 (4): 927-936, in the study of the stability analysis and damping control method of the direct-current micro-grid, a compensation link of low-pass filtering is connected in series in a sagging control loop of a direct-current bus voltage control unit, so that the output impedance of the converter is changed, the stability margin of the system is improved, and the compensation has an influence on the impedance characteristics of all frequency bands. Wu Wenhua et al in chinese motor engineering journal, 2018, 38 (15): the 4359-4368+4636 direct current impedance modeling, oscillation analysis and suppression method of the island VSC-HVDC power transmission system discloses a virtual resistance inductive impedance stability control method aiming at a rectifier station, and the direct current side oscillation of the VSC-HVDC power transmission system is effectively suppressed. However, the above document is directed to a method for improving the stability of a dc micro grid at a fixed operating point, and when the constant power load increases, the operating point changes, and the control strategy may fail. Therefore, the self-adaptive active damping control method is researched aiming at the problem that the compensation capability of the traditional damping control strategy is insufficient when the constant power load power is increased, and the stability of the isolated direct current micro-grid system is enhanced. Meanwhile, direct current bus voltage unbiased control is introduced to reduce the direct current bus voltage bias problem caused by the self-adaptive active damping control strategy, and ensure safe and stable operation of the isolated direct current micro-grid.
Disclosure of Invention
The invention aims to provide an improved self-adaptive active damping control method for an isolated direct current micro-grid storage battery DC-DC converter.
In order to solve the technical problems, the invention adopts the following technical scheme that the method comprises the following steps:
step 1: establishing an isolated direct current micro-grid model: the isolated direct current micro-grid comprises a distributed power supply, a storage battery and a load unit; the distributed power supply, the storage battery and the constant power load contained in the isolated direct current micro-grid are connected into a direct current bus through a corresponding DC-DC or AC-DC converter; the distributed power supply, the storage battery and the load unit contained in the isolated direct current micro-grid comprise a control system, a measuring element and a converter; the input ends of a control system of a distributed power supply, a storage battery and a load unit contained in the isolated direct current micro-grid are respectively connected with the output ends of corresponding measuring elements, and the output ends of the control system are connected with the input ends of corresponding converters; the measuring element in the isolated direct current micro-grid mainly comprises a distributed power supply, a storage battery, a direct current bus side voltage sensor and a current sensor of a load unit, and a voltage sensor and a current sensor of the distributed power supply side, the storage battery side and a constant power load side; when the AC main network is out of operation and the DC micro-grid is in an off-grid mode, the storage battery adopts droop control, active power balance in the system is maintained, and the voltage stability of the DC bus is ensured;
step 2: signal measurement: measuring the DC bus voltage udc in an isolated DC micro-grid and the input voltage u of a battery DC-DC converter by means of a voltage sensor b Measuring battery DC-DC converter input current i by means of a current sensor b Output current i o And a DC bus side current i dc ；
Step 3: adaptive active damping control: compensating the sagging coefficient by utilizing the self-adaptive virtual resistor control; introducing a power factor xi p Adaptive virtual resistor R va The expression is shown as a formula (1):
wherein: p (P) m Rated capacity of the grid-connected converter; u (u) dc * Is a direct current bus voltage reference value; i.e dc Is a direct current side current; r is R v Is a fixed virtual resistor;
obtaining a direct-current bus voltage reference value u according to a self-adaptive active damping control strategy dc * The method comprises the following steps:
wherein: u (u) N The converter is unloaded and output voltage; i.e dc * Is a direct current side current reference value;
step 4: voltage no-deviation control: in order to realize the direct current bus voltage non-deviation control, a compensation term epsilon is added on the basis of a formula (2) u Obtaining a direct current bus voltage reference value u dc * The method comprises the following steps:
step 5: and (5) calculating the duty ratio: according to a voltage average equation in a switching period, the duty ratio D of the storage battery DC-DC converter is calculated, and a control signal is sent into a switching tube of the storage battery DC-DC converter to carry out PWM modulation control:
wherein: l, R are the filter inductance and parasitic resistance of the battery DC-DC converter, respectively.
The technical effect obtained by adopting the technical scheme is as follows:
the invention adopts an improved self-adaptive active damping control method, and simultaneously introduces self-adaptive active damping control and DC bus voltage non-deviation control, wherein the self-adaptive active damping control improves the stability margin of an isolated DC micro-grid system, and the voltage non-deviation control reduces the DC bus voltage deviation caused by a self-adaptive active damping control strategy, and the self-adaptive active damping control and the DC bus voltage non-deviation control act together, thereby being beneficial to the safe and stable operation of the DC micro-grid.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the structure of an isolated DC micro-grid;
fig. 3 is a schematic diagram of the control of the battery DC-DC converter according to the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Referring to fig. 1-3, an improved adaptive active damping control method for an isolated direct current microgrid storage battery DC-DC converter includes the steps of:
step 1: establishing an isolated direct current micro-grid model: the isolated direct current micro-grid comprises a distributed power supply, a storage battery and a load unit; the distributed power supply, the storage battery and the constant power load contained in the isolated direct current micro-grid are connected into a direct current bus through a corresponding DC-DC or AC-DC converter; the distributed power supply, the storage battery and the load unit contained in the isolated direct current micro-grid comprise a control system, a measuring element and a converter; the input ends of a control system of a distributed power supply, a storage battery and a load unit contained in the isolated direct current micro-grid are respectively connected with the output ends of corresponding measuring elements, and the output ends of the control system are connected with the input ends of corresponding converters; the measuring element in the isolated direct current micro-grid mainly comprises a distributed power supply, a storage battery, a direct current bus side voltage sensor and a current sensor of a load unit, and a voltage sensor and a current sensor of the distributed power supply side, the storage battery side and a constant power load side; when the AC main network is out of operation and the DC micro-grid is in an off-grid mode, the storage battery adopts droop control, active power balance in the system is maintained, and the voltage stability of the DC bus is ensured;
step 2: signal measurement: measuring DC bus voltage u in isolated DC micro-grid by voltage sensor dc And the input voltage u of the storage battery DC-DC converter b Measuring battery DC-DC converter input current i by means of a current sensor b Output current i o And a DC bus side current i dc ；
Step 3: adaptive active damping control: compensating the sagging coefficient by utilizing the self-adaptive virtual resistor control; introducing a power factor xi p Adaptive virtual resistor R va The expression is shown as a formula (1):
wherein: p (P) m Rated capacity of the grid-connected converter; u (u) dc * Is a direct current bus voltage reference value; i.e dc Is a direct current side current; r is R v Is a fixed virtual resistor;
obtaining a direct-current bus voltage reference value u according to a self-adaptive active damping control strategy dc * The method comprises the following steps:
wherein: u (u) N The converter is unloaded and output voltage; i.e dc * Is a direct current side current reference value;
step 4: voltage no-deviation control: in order to realize the direct current bus voltage non-deviation control, a compensation term epsilon is added on the basis of a formula (2) u Obtaining a direct current bus voltage reference value u dc * The method comprises the following steps:
step 5: and (5) calculating the duty ratio: according to a voltage average equation in a switching period, the duty ratio D of the storage battery DC-DC converter is calculated, and a control signal is sent into a switching tube of the storage battery DC-DC converter to carry out PWM modulation control:
wherein: l, R are the filter inductance and parasitic resistance of the battery DC-DC converter, respectively.
Claims (1)
1. An improved self-adaptive active damping control method of an isolated direct current micro-grid storage battery DC-DC converter is characterized by comprising the following steps of: the method comprises the following steps:
step 1: establishing an isolated direct current micro-grid model: the isolated direct current micro-grid comprises a distributed power supply, a storage battery and a load unit; the distributed power supply, the storage battery and the constant power load contained in the isolated direct current micro-grid are connected into a direct current bus through a corresponding DC-DC or AC-DC converter; the distributed power supply, the storage battery and the load unit contained in the isolated direct current micro-grid comprise a control system, a measuring element and a converter; the input ends of a control system of a distributed power supply, a storage battery and a load unit contained in the isolated direct current micro-grid are respectively connected with the output ends of corresponding measuring elements, and the output ends of the control system are connected with the input ends of corresponding converters; the measuring element in the isolated direct current micro-grid mainly comprises a distributed power supply, a storage battery, a direct current bus side voltage sensor and a current sensor of a load unit, and a voltage sensor and a current sensor of the distributed power supply side, the storage battery side and a constant power load side; when the AC main network is out of operation and the DC micro-grid is in an off-grid mode, the storage battery adopts droop control, active power balance in the system is maintained, and the voltage stability of the DC bus is ensured;
step 2: signal measurement: measuring DC bus voltage u in isolated DC micro-grid by voltage sensor dc And the input voltage u of the storage battery DC-DC converter b Measuring battery DC-DC converter input current i by means of a current sensor b Output current i o And a DC bus side current i dc ；
Step 3: adaptive active damping control: compensating the sagging coefficient by utilizing the self-adaptive virtual resistor control; introducing a power factor xi p Adaptive virtual resistor R va The expression is shown as a formula (1):
wherein: p (P) m Rated capacity of the grid-connected converter; u (u) dc * Is a direct current bus voltage reference value; i.e dc Is a direct current side current; r is R v Is a fixed virtual resistor;
obtaining a direct-current bus voltage reference value u according to a self-adaptive active damping control strategy dc * The method comprises the following steps:
wherein: u (u) N The converter is unloaded and output voltage; i.e dc * Is a direct current side current reference value;
step 4: voltage no-deviation control: in order to realize the direct current bus voltage non-deviation control, a compensation term epsilon is added on the basis of a formula (2) u Obtaining a direct current bus voltage reference value u dc * The method comprises the following steps:
step 5: and (5) calculating the duty ratio: according to a voltage average equation in a switching period, the duty ratio D of the storage battery DC-DC converter is calculated, and a control signal is sent into a switching tube of the storage battery DC-DC converter to carry out PWM modulation control:
wherein: l, R are the filter inductance and parasitic resistance of the battery DC-DC converter, respectively.
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