CN113258562A - Energy router operation control method and system - Google Patents
Energy router operation control method and system Download PDFInfo
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- CN113258562A CN113258562A CN202110427740.3A CN202110427740A CN113258562A CN 113258562 A CN113258562 A CN 113258562A CN 202110427740 A CN202110427740 A CN 202110427740A CN 113258562 A CN113258562 A CN 113258562A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses an energy router operation control method and system, wherein the energy router is divided into a normal operation mode and a low-voltage ride-through mode. Under a normal operation mode, the coordination and the stability of the system are realized by the staged output scheduling of the diesel generator, the power balance between the source and the load is maintained, the SOC regulation and control of the energy storage unit are realized, and the efficient operation of the energy router is ensured; under the low-voltage ride-through mode, the diesel generator and the photovoltaic power generation unit output power according to the maximum output power, the energy storage unit adopts constant-voltage control, and system-level coordination control is performed to inhibit the continuous reduction of the bus voltage, support the rapid recovery of the bus voltage and ensure the effective ride-through of the low-voltage fault of the energy router. Meanwhile, the low-voltage drop detection is carried out by adopting a zero-phase-shift low-pass filtering and hysteresis comparison method, so that the real-time performance and the immunity of the detection are ensured, and the frequent switching between the modes is avoided.
Description
Technical Field
The invention relates to the technical field of micro-source interconnection power supply and control, in particular to an energy router operation control method and system.
Background
The energy router refers to a power electronic device which fuses information flow and energy flow to achieve multi-source interconnection. The energy router topology interface is shown in fig. 1, and includes two dc buses: the diesel generator is connected with a direct current bus through a one-way AC/DC converter, the photovoltaic array is connected with the direct current bus through a one-way DC/DC converter 1, the energy storage unit is connected with the direct current bus through a two-way DC/DC converter, the direct current bus forms high-voltage and low-voltage direct current interfaces for power supply through the one-way DC/ DC converters 2 and 3 respectively, and meanwhile, a direct current bus interconnection interface is reserved outside the direct current bus, so that external systems can be interconnected conveniently; the diesel generator is connected with an alternating current bus through a bypass switch, the direct current bus is connected with the alternating current bus through a PWM inverter, and three-phase and single-phase alternating current interfaces are respectively led out from the alternating current bus for power supply. The energy router adopts a photovoltaic unit, an energy storage unit and a diesel generator to jointly supply power.
The energy router can realize high-efficient utilization of various energy sources, provides a flexible power electronic interface, and simultaneously undertakes energy management work, thereby improving the energy source guarantee capability of a power supply system. Special application scenes such as island development, field battle and the like provide more severe challenges for the reliable work of the energy router. On one hand, the scene lacks the support of a large power grid, the energy router system does not have enough inertia and damping, and various power quality and stability problems emerge; meanwhile, the output voltage ranges of various micro sources in different forms are wide in distribution and large in output characteristic difference, so that the energy router system needs to have access capability in a wider voltage range and the control method is complicated; in addition, various sensitive loads under the scene have extremely high requirements on power supply reliability and anti-interference capability, and provide higher challenges for the dynamic and steady-state performances of the system coordination control method. On the other hand, in such a scene, the environment is severe, the energy router system works under extreme working conditions for a long time, the probability of faults such as overcurrent and short circuit of modules in the system is increased, the safety problems seriously threaten the stability and reliability of the whole system, and in order to ensure the rapid recovery and stable operation of the system after the faults occur, the low-voltage ride-through capability of the energy router faces more serious challenges. In summary, it is necessary to overcome the significant problems of efficient operation and low voltage ride through of the energy router.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for controlling operation of an energy router to prevent system oscillation caused by mode switching, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an energy router operation control method comprises the following steps:
s1, sampling the DC bus voltage VbusWill direct current bus voltage VbusFiltering with zero phase shift low pass filter H (z) to obtain signal Vbus_fil(ii) a Wherein h (z) ═ h (z) dichloroy2H (z) is a phase-shifted low-pass filter inside a zero-phase-shifted low-pass filter H (z), and the DC bus voltage VbusAnd the filtered signal Vbus_filSatisfy Vbus_fil(z)＝H(z)Vbus(z)，Vbus(z) is VbusZ transformation of (V)bus_fil(z) is Vbus_filZ-transform of (c);
s2, when Vbus_fil>Vbus_rglWhen the energy router is in the normal operation mode, controlling the energy router to be in the normal operation mode; when V isbus_fil<Vbus_rdthWhen the energy router is in the low-voltage traversing mode, the energy router is controlled to be in the low-voltage traversing mode; wherein, Vbus_rgl≥Vbus_rdth；Vbus_rglIs a normal operation mode threshold value，Vbus_rdthIs a low voltage ride through mode threshold.
Low pass filtering removes VbusThe noise interference is avoided, and high interference resistance of signal processing is realized; meanwhile, compared with the conventional low-pass filtering, the zero-phase-shift low-pass filtering mode eliminates filtering delay and ensures high real-time performance of signal detection; in addition, for Vbus_filPerforming a hysteresis comparison avoids Vbus_filFrequent switching of the system operating mode when changing around the critical value suppresses system oscillations that may be caused by mode switching.
In step S2, the specific implementation process of controlling the energy router to be in the normal operation mode includes: if the SOC of the energy storage unit is higher than the threshold SOC of the discharge modedisEntering a discharging mode, and if the SOC of the energy storage unit is lower than a charging mode threshold value SOCchEntering a charging mode; the energy storage unit stabilizes the DC bus voltage at a reference value Vref；
When the energy storage unit is in a charging mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n) Δ p (n) or more; when the energy storage unit is in a discharge mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n) is less than or equal to delta p (n-1); wherein, Δ p ═ pload-ppv，ploadTotal load power required for the energy router; p is a radical ofpvOutputting power for the photovoltaic unit; divide Δ p into N stages and specify Δ p (0) ═ Δ pmin，Δp(N)＝Δpmax，Δp(0)≤Δp(1)≤Δp(2)≤…≤Δp(N)，n＝1，2…N；pdg(n) represents the nth power stage of [ Δ p (n-1), Δ p (n)]The assigned diesel generator stage output value.
After the energy storage units are divided according to different charging and discharging modes, the surplus power can be absorbed by the energy storage units in the charging mode, and the surplus power can be compensated by releasing the power of the energy storage units in the discharging mode, so that the SOC of the energy storage units can be kept at the SOCchAnd SOCdisIn the meantime.
Let n1≤n2≤n3，n1、n2、n31, 2 … N, when Δ p is defined by the nth2A stage[Δp(n2-1)，Δp(n2)]Increase to the n-th3A phase [ delta p (n)3-1)，Δp(n3)]When is, pdgChange to pdg(n3) (ii) a When Δ p is changed from n2A phase [ delta p (n)2-1)，Δp(n2)]Decrease to the n-th1A phase [ delta p (n)1-1)，Δp(n1)]When is, pdgChange to pdg(n1+1)。
Setting p accordingly according to the difference of delta p change directiondgAfter the value of (a), it is ensured that when Δ p changes around the power stage boundary value Δ p (N) (1, 2 … N), p changesdgThe power of the diesel generator is not frequently adjusted due to no frequent change, and the power oscillation of the system is avoided.
In step S2, the specific implementation process of controlling the energy router to be in the low voltage ride through mode includes: enabling the photovoltaic unit to output power p by adopting an MPPT methodpvTracking to maximum output power ppv_maxOutput power p of diesel generatordgSet to maximum output power pdg_maxThe reference value of the DC bus voltage is set to Vref. After the arrangement, the photovoltaic unit outputs power ppvDiesel generator output power pdgAll according to its maximum output power ppv_max、pdg_maxThe output ensures that the new energy can still be fully utilized in the low-voltage ride-through process, and the diesel generator keeps high-efficiency operation; meanwhile, the energy storage unit still maintains voltage stabilization control, the output of the direct current bus voltage controller reaches the upper saturation limit of a rear-stage amplitude limiter, and the energy storage unit outputs power p according to the maximum saturationbat_maxThe bus voltage recovery is supported to the maximum extent by exerting force, and system oscillation possibly introduced by switching of the energy storage unit control method is avoided.
In the present invention, Vbus_rdth＝0.8Vref，Vbus_rgl＝0.9Vref。
The invention also provides an energy router operation control system, which comprises computer equipment; the computer device is configured for performing the steps of the above-described method.
Compared with the prior art, the invention has the beneficial effects that: the invention can effectively detect the voltage drop degree of the direct current bus of the energy router, and ensures high immunity and real-time property of detection by combining zero phase shift low-pass filtering and hysteresis comparison; the invention can realize high efficiency and stability when the system normally operates, and realizes active regulation and control of source load power balance and SOC of the energy storage unit based on grading output scheduling of the diesel generator; the invention can realize quick crossing when the system has low-voltage fault, can support bus voltage recovery by utilizing new energy to the maximum extent, ensures that the diesel generator always works in a high-efficiency power interval, and simultaneously avoids unnecessary oscillation caused by system working mode switching.
Drawings
FIG. 1 is an energy router topology;
FIG. 2(a) is a method for low voltage fault determination according to an embodiment of the present invention; FIG. 2(b) shows the internal signal flow of the zero-phase-shift low-pass filter;
FIG. 2(c) shows the input/output characteristics of the hysteresis comparison link;
FIG. 3 illustrates an efficient stabilization method in a normal operation mode according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a voltage recovery method in a low voltage ride through mode according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention comprises the following steps:
1) according to the DC bus voltage VbusThe method for judging the low-voltage fault and determining the system working mode comprises the following steps: sampling DC bus voltage VbusWill direct current bus voltage VbusFiltering with zero phase shift low pass filter H (z) to obtain signal Vbus_filThereby filtering the DC bus voltage VbusThe noise above interferes and guarantees real-time performance. Wherein h (z) is a conventional phase-shifted low-pass filter inside the zero-phase-shifted low-pass filter H (z), and H (z) ═ h (z) & gtY2(ii) a DC bus voltage VbusAnd the filtered signal Vbus_filSatisfy Vbus_fil(z)＝H(z)Vbus(z)；
② to the filtered signal Vbus_filPerforming hysteresis comparison to determine that the current system is in normal operation modeOr low voltage ride through mode while avoiding frequent switching between modes of operation. Wherein, Vbus_filIs a signal of the present DC bus voltage, Vbus_rglFor normal operating mode threshold, Vbus_rdthIs a low voltage pass-through mode threshold, and Vbus_rdth<Vbus_rgl(ii) a When the system is in the normal operation mode, executing the coordination control method in the normal operation mode in the step 2), and only when V isbus_fil<Vbus_rdthThe system enters a low-voltage ride-through mode; when the system is in a low-voltage ride-through mode, executing a fault handling method in a low-voltage ride-through mode in 3), and only when V isbus_fil>Vbus_rglThen the system enters normal operation mode.
By the low-voltage fault judgment mode, on one hand, the direct-current bus voltage V is filtered out through low-pass filteringbusThe noise interference realizes high interference resistance of signal processing, and compared with the conventional low-pass filtering, the zero-phase shift low-pass filtering eliminates filtering delay and ensures high real-time performance of signal detection; on the other hand, by filtering the filtered signal Vbus_filCarry out hysteresis comparison, avoid Vbus_filWhen the system is near the critical value, the working mode of the system is frequently switched, and the system oscillation caused by mode switching is restrained. The combination of the two can effectively establish the current working mode of the system.
2) Under the normal operation mode, the coordination control of the energy router is carried out based on the staged output scheduling of the diesel generator, and the method specifically comprises the following steps:
the method comprises the steps of dividing an energy storage unit into a charging mode and a discharging mode according to the SOC value of the energy storage unit, and switching the modes in a hysteresis mode to avoid frequent switching between the charging and discharging modes. Therein, SOCcurIs the current SOC value, SOC of the energy storage unitchTo charge mode threshold, SOCdisIs a discharge mode threshold, and SOCch<SOCdis(ii) a When the energy storage unit is in a charging mode, the energy storage unit is enabled to preferentially absorb energy to avoid SOCcurTowards the minimum value SOCminAnd only if SOCcur>SOCdisThe energy storage unit enters a discharge mode; when the energy storage unit is in the discharge mode, the energy storage unit is enabled to give out force preferentially and avoidSOC-freecurTowards the maximum value SOCmaxAnd only if SOCcur<SOCchThe energy storage unit enters a charging mode;
and secondly, tracking the maximum output power by the photovoltaic unit, and utilizing new energy to the maximum extent. Let ppvFor photovoltaic cell output power, ppv_maxFor the maximum output power of the photovoltaic unit, an MPPT algorithm (such as the MPPT algorithms described in "overview of maximum power point tracking control method for photovoltaic array" published in "high voltage technology" 2008, 6 th 1145 th 1154 of "high voltage technology" and so on) is adopted to make the output power p of the photovoltaic unitpvTracking to maximum output power ppv_maxEnsuring the full consumption of new energy;
stabilizing the DC bus voltage at the reference value V by the voltage stabilizing control of the energy storage unitref. Regulating the output power p of an energy storage unit by closed-loop controlbatCompensating and tracking the power shortage and surplus on the DC bus, and converting the DC bus voltage VbusControl to reference value VrefAnd the stable operation of the system is ensured. Wherein, VbusIs the dc bus voltage.
Output power p of diesel generatordgAnd performing staged output scheduling according to the charging and discharging modes of the energy storage unit respectively to maintain the SOC of the energy storage unit within a reasonable range, and performing staged switching in a hysteresis mode to avoid frequent switching among output stages. p is a radical ofdg_maxIs the maximum output power, p, of the diesel generatordg_effLower threshold power for the efficient operating power section of a diesel generator, i.e. when pdg_eff≤pdg≤pdg_maxWhen the diesel generator works, the working efficiency of the diesel generator is higher; p is a radical ofloadFor the total load power demand of the system, Δ p is the uncertainty power demand of the direct current bus, and is defined as Δ p ═ pload-ppv，ΔpminIs the minimum value of the normal power range of Δ p, Δ pmaxIs the maximum value of the ap normal power range. The method specifically comprises the following steps:
I. and dividing the normal power range of the uncertain power demand delta p of the direct current bus into N stages. Where Δ p (m) represents the boundary power value of each stage, m is 0, 1, 2 … N,and specifies Δ p (0) ═ Δ pmin，Δp(N)＝ΔpmaxDelta p (0) ≦ delta p (1) ≦ delta p (2) ≦ … ≦ delta p (N), and the upper and lower boundary power values of the nth power stage of delta p are respectively delta p (n-1) and delta p (n), namely, delta p epsilon [ delta p (n-1), delta p (n) of the nth power stage]，n＝1，2…N；
II. Any nth power phase [ Δ p (n-1), Δ p (n) ] of divided Δ p]All are assigned a diesel generator stage output value pdg(n) of (a). Wherein p isdg(n) satisfies pdg(n) 0 or pdg_eff≤pdg(n)≤pdg_maxSo that the diesel generator does not output power or outputs power in a high-efficiency power interval; p is a radical ofdg_effAnd pdg_maxIs determined by the parameters of the diesel generator, and p is further divided according to the charging and discharging mode of the energy storage unitdg(n) value range: when the energy storage unit is in a charging mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n) Δ p (n) or more; when the energy storage unit is in a discharge mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n)≤Δp(n-1)；
III, completion pair Δ p, pdgAfter the stage division, the diesel generator can be further used for carrying out output scheduling according to the power stage of the delta p. Wherein if there is n1≤n2≤n3，n1、n2、n31, 2 … N, when Δ p is defined by the nth2A phase [ delta p (n)2-1)，Δp(n2)]Increase to the n-th3A phase [ delta p (n)3-1)，Δp(n3)]When is, pdgChange to pdg(n3) (ii) a When Δ p is changed from n2A phase [ delta p (n)2-1)，Δp(n2)]Decrease to the n-th1A phase [ delta p (n)1-1)，Δp(n1)]When is, pdgChange to pdg(n1+1). This introduces a hysteresis effect, avoiding p when Δ p is near the power phase boundarydgFrequent output changes occur, and the running loss of the diesel generator is further reduced.
When the system is in a normal operation mode, according to the SOC value of the energy storage unitThe charging and discharging modes are divided in a delaying mode, so that the damage of frequent charging and discharging to the service life of the energy storage unit is avoided; the photovoltaic unit tracks the maximum output power of the photovoltaic unit by adopting an MPPT algorithm, so that the utilization rate of new energy is effectively improved; in addition, because the output power and the load power of the photovoltaic unit are uncertain, the output power and the load power of the photovoltaic unit are combined into a direct-current bus uncertain power demand delta p, and the output p of the diesel generator is divided into stages based on delta pdgCarry out delayed scheduling, not only ensuring pdgThe good tracking of the delta p reduces the scheduling times, and simultaneously ensures the regulation and control of the SOC of the energy storage unit; the energy storage unit maintains the power balance of the system by matching the closed-loop voltage stabilization control of the direct current bus with the diesel generator, and effectively ensures the stable operation of the system.
3) Under the low-voltage ride through mode, performing system-level coordination to realize low-voltage ride through processing under a fault, specifically comprising the following contents:
firstly, the MPPT of the photovoltaic unit tracks the maximum output power and outputs power to the maximum extent. Wherein p ispvFor photovoltaic cell output power, ppv_maxFor the maximum output power of the photovoltaic unit, the MPPT algorithm is adopted to ensure that the output power p of the photovoltaic unit ispvTracking to maximum output power ppv_maxThe bus voltage recovery is supported to the maximum extent by the photovoltaic unit;
② output power p of diesel generatordgAt maximum output power pdg_maxAnd (5) applying force to implement full-power operation. The bus voltage recovery is supported to the maximum extent by the diesel generator, and the diesel generator is operated in a high-efficiency power interval;
thirdly, the voltage stabilization control of the energy storage unit sets the voltage reference value of the direct-current bus as VrefStill keeping closed-loop control of DC bus voltage VbusThe output of the direct current bus voltage controller reaches the saturation upper limit of a rear-stage amplitude limiter, and the energy storage unit outputs power p according to the maximum saturationbat_maxThe bus voltage recovery is supported to the maximum extent, and meanwhile, the oscillation caused by switching of the control method of the energy storage unit when the system recovers to a normal operation mode is avoided.
When the system is in low voltage ride through mode, the light is enabledOutput power p of the voltage unitpvDiesel generator output power pdgAll according to its maximum output power ppv_max、pdg_maxThe output ensures that new energy can be fully utilized in the low-voltage ride-through process and the diesel generator can operate efficiently; meanwhile, the energy storage unit still maintains voltage stabilization control, so that the energy storage unit adopts the same control method in two system working modes, and oscillation caused by switching of the system working modes is avoided.
As shown in fig. 2(a) to 2(c), the low-voltage fault determination method according to the embodiment of the present invention is implemented by sampling the dc bus voltage V obtained by samplingbusInputting the signal into a zero phase shift low-pass filter, filtering to obtain a signal V which is used for filtering high-frequency noise and has no phase delaybus_filEnsuring high noise immunity and real-time property of subsequent processing, and then filtering the signal Vbus_filA hysteresis comparison is made to establish the energy router system operating mode, i.e., in a normal operating mode or a low voltage ride through mode.
FIG. 2(b) shows the internal signal flow of the zero-phase-shift low-pass filter, the intermediate signal Y1(z)、Y2(z)、Y3The expressions of (z) are respectively:
Y1(z)＝H(z)Vbus(z)
Y2(z)＝Y1(1/z)＝H(1/z)Vbus(1/z)
Y3(z)＝H(z)Y2(z)＝H(z)H(1/z)Vbus(1/z)
considering the frequency domain analysis, it is desirable that z-ejωZero phase shift low pass filter output signal Vbus_filThe expression of (z) is:
Vbus_fil(ejw)＝Y3(e-jw)＝|H(ejw)|2Vbus(ejw)
as shown in fig. 2(c), the input/output characteristics of the hysteresis comparison element are set as V in this embodimentbus_rdth＝0.8Vref，Vbus_rgl＝0.9Vref. Thus, when the system is in the normal operation mode, if Vbus_fil＜0.8VrefThen the system is operatedSwitching the mode to a low-voltage ride through mode to perform fault ride through processing; when the system is in the low voltage ride through mode, if Vbus_fil＞0.9VrefAnd if so, switching the system working mode to a normal running mode to maintain the stable work of the system.
As shown in fig. 3, in the efficient stabilizing method in the normal operation mode according to an embodiment of the present invention, Δ p and p are divided according to the charging and discharging mode of the energy storage unitdgAnd performing diesel generator staged output scheduling based on the power stage division. In this embodiment, the SOC is setch＝0.6，SOCdisWhen the energy storage unit is in the discharging mode, if the current SOC is less than 0.6, the energy storage unit is switched to the charging mode to preferentially absorb energy; when the energy storage unit is in a charging mode, if the current SOC is more than 0.7, the energy storage unit is switched to a discharging mode, and output is preferentially carried out.
In this embodiment, the normalized Δ p ∈ [ -1, 1 is set]，Δpmin＝-1，Δp max1, and dividing Δ p into 7 power stages, Δ p (0) — 1, Δ p (1) — 0.2, Δ p (2) — 0, Δ p (3) — 0.2, Δ p (4) — 0.4, Δ p (5) — 0.6, Δ p (6) — 0.8, Δ p (7) — 1; normalized pdg∈[0，1]，pdg_eff＝0.3，p dg_max1. P of 7 power phases allocated to Δ p when the energy storage unit is in charging modedg(n) are respectively: p is a radical ofdg(1)＝0，pdg(2)＝0，pdg(3)＝0.4，pdg(4)＝0.4，pdg(5)＝0.6，pdg(6)＝0.8，pdg(7) 1. P in the left charging mode in fig. 3dgΔ p characteristic diagram, p when Δ p increasesdgChanging the output according to the dotted line in the characteristic curve graph; when Δ p decreases, pdgChanging the output according to the dotted line in the characteristic curve graph; p of 7 power phases allocated to Δ p when the energy storage unit is in discharge modedg(n) are respectively: p is a radical ofdg(1)＝0，pdg(2)＝0，pdg(3)＝0，pdg(4)＝0，pdg(5)＝0.4，pdg(6)＝0.6，pdg(7) 0.8. P in the right discharge mode in FIG. 3dg- Δ PtterCharacteristic plot, when Δ p increases, pdgChanging the output according to the dotted line in the characteristic curve graph; when Δ p decreases, pdgThe force is changed by drawing a dot line in the characteristic curve.
As shown in fig. 4, the photovoltaic unit is still operated at the maximum output power p no matter whether the energy storage unit is in the charging mode or the discharging modepv_maxOutput, diesel generator is according to maximum output power pdg_maxForce, p in the left and right charge-discharge mode in FIG. 4dgDashed line in the- Δ p characteristic diagram.
Claims (6)
1. An energy router operation control method is characterized by comprising the following steps:
s1, sampling the DC bus voltage VbusWill direct current bus voltage VbusFiltering with zero phase shift low pass filter H (z) to obtain signal Vbus_fil(ii) a Wherein h (z) ═ h (z) dichloroy2H (z) is a phase-shifted low-pass filter inside a zero-phase-shifted low-pass filter H (z), and the DC bus voltage VbusAnd the filtered signal Vbus_filSatisfy Vbus_fil(z)＝H(z)Vbus(z)，Vbus(z) is VbusZ transformation of (V)bus_fil(z) is Vbus_filZ-transform of (c); z ═ esTT is a discretization period;
s2, when Vbus_fil>Vbus_rglWhen the energy router is in the normal operation mode, controlling the energy router to be in the normal operation mode; when V isbus_fil<Vbus_rdthWhen the energy router is in the low-voltage traversing mode, the energy router is controlled to be in the low-voltage traversing mode; wherein, Vbus_rgl≥Vbus_rdth；Vbus_rglFor normal operating mode threshold, Vbus_rdthIs a low voltage ride through mode threshold.
2. The method according to claim 1, wherein in step S2, the specific implementation process of controlling the energy router to be in the normal operation mode includes: if the SOC of the energy storage unit is higher than the threshold SOC of the discharge modedisEntering a discharging mode, and if the SOC of the energy storage unit is lower than a charging mode threshold value SOCchEntering a charging mode; the energy storage unit stabilizes the DC bus voltage at a reference value Vref；
When the energy storage unit is in a charging mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n) Δ p (n) or more; when the energy storage unit is in a discharge mode, if delta p epsilon [ delta p (n-1), delta p (n)]Then p isdg(n) satisfies pdg(n) is less than or equal to delta p (n-1); wherein, Δ p ═ pload-ppv，ploadTotal load power required for the energy router; p is a radical ofpvOutputting power for the photovoltaic unit; divide Δ p into N stages and specify Δ p (0) ═ Δ pmin，Δp(N)＝Δpmax，Δp(0)≤Δp(1)≤Δp(2)≤…≤Δp(N)，n＝1，2…N；pdg(n) represents the nth power stage of [ Δ p (n-1), Δ p (n)]The assigned diesel generator stage output value.
3. The energy router operation control method according to claim 2, wherein let n be1≤n2≤n3，n1、n2、n31, 2 … N, when Δ p is defined by the nth2A phase [ delta p (n)2-1)，Δp(n2)]Increase to the n-th3A phase [ delta p (n)3-1)，Δp(n3)]When is, pdgChange to pdg(n3) (ii) a When Δ p is changed from n2A phase [ delta p (n)2-1)，Δp(n2)]Decrease to the n-th1A phase [ delta p (n)1-1)，Δp(n1)]When is, pdgChange to pdg(n1+1)。
4. The method according to claim 1, wherein the step S2 of controlling the energy router to be in the low voltage ride through mode includes: enabling the photovoltaic unit to output power p by adopting an MPPT methodpvTracking to maximum output power ppv_maxOutput power p of diesel generatordgSet to maximum output power pdg_maxThe reference value of the DC bus voltage is set to Vref。
5. The energy router operation control method according to any one of claims 2 to 4, wherein V isbus_rdth＝0.8Vref，Vbus_rgl＝0.9Vref。
6. An energy router operation control system, comprising a computer device; the computer device is configured for performing the steps of the method of one of claims 1 to 5.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069707A (en) * | 2021-11-24 | 2022-02-18 | 国网天津市电力公司 | Method and device for improving voltage sag tolerance capability of photovoltaic system by using fan |
| CN116937597A (en) * | 2023-09-13 | 2023-10-24 | 西安西电高压开关有限责任公司 | Low-voltage ride through control method for multiport energy router |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109018291A (en) * | 2018-07-24 | 2018-12-18 | 李继祎 | A kind of ship power supply system and control method |
| CN110110422A (en) * | 2019-04-29 | 2019-08-09 | 达器船用推进器(江苏)有限公司 | The minimum oil consumption rate optimization method of the more power supply complicated utilizations of ship |
-
2021
- 2021-04-21 CN CN202110427740.3A patent/CN113258562B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109018291A (en) * | 2018-07-24 | 2018-12-18 | 李继祎 | A kind of ship power supply system and control method |
| CN110110422A (en) * | 2019-04-29 | 2019-08-09 | 达器船用推进器(江苏)有限公司 | The minimum oil consumption rate optimization method of the more power supply complicated utilizations of ship |
Non-Patent Citations (5)
| Title |
|---|
| CHIH-TA TSAI: "Control Strategy of PV/Diesel/Battery Hybrid System for Island-Based Microgrid", 《2018 INTERNATIONAL SYMPOSIUM ON COMPUTER, CONSUMER AND CONTROL (IS3C)》 * |
| 刘远东等: "基于负载驱动的通讯发电机组节能系统的研究", 《机电工程技术》 * |
| 祝逍临: "船舶光伏-混合储能系统的控制优化", 《船海工程》 * |
| 范柱烽等: "光储微电网的低电压穿越控制策略研究", 《电力系统保护与控制》 * |
| 赵悦等: "基于MPC的多源孤岛微电网协调控制", 《应用科技》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069707A (en) * | 2021-11-24 | 2022-02-18 | 国网天津市电力公司 | Method and device for improving voltage sag tolerance capability of photovoltaic system by using fan |
| CN114069707B (en) * | 2021-11-24 | 2024-01-23 | 国网天津市电力公司 | Method and device for improving voltage sag tolerance capacity of photovoltaic system by using fan |
| CN116937597A (en) * | 2023-09-13 | 2023-10-24 | 西安西电高压开关有限责任公司 | Low-voltage ride through control method for multiport energy router |
| CN116937597B (en) * | 2023-09-13 | 2023-12-19 | 西安西电高压开关有限责任公司 | Low-voltage ride through control method for multiport energy router |
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